JPH05222601A - Elastic composite and its manufacturing method - Google Patents

Abstract

(57) [Summary] (Correction) [Objective] The present invention relates to an elastic composite particularly applied to the waist and crotch of a disposable diaper or the like. A sheet-like elastic body in a relaxed state and a sheet-like base material that is not stretched or formed with folds are provided, and the elastic body is formed on the base material in a sheet length direction (M
D) is continuously bonded, and is discontinuously bonded in the lateral (CD) direction, and the base material has extensibility in the CD direction but has no elongation recovery property. The elastic composite, the elastic composite obtained by stretching the elastic composite, and the production method thereof. [Effect] It is particularly suitable for the waist and crotch of disposable diapers, and has a large degree of elongation and is stable.
It is kind to the skin and easy to manufacture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic composite body which is suitable for a composite of a sheet-like elastic body and a sheet-like base material such as a non-woven fabric, and is particularly suitable for disposable products such as diapers, and a method for producing the same.

[0002]

2. Description of the Related Art Various kinds of daily necessities such as underwear and socks, waists, crotches, elastic bandages and cuffs of surgical gowns are used to enhance and improve adhesion to the human body. An elastic body is used. These include natural rubber,
Synthetic rubber, urethane resin, and other materials are used in the form of threads, foams, films, and nets, and in order to avoid direct contact with the human body, they are used in woven, non-woven, or covered with threads. It is common to have

Generally, for use in disposable products, the price is low, the workability for adapting to mass production at high speed is excellent, and strict safety is required for sensitive skin of infants. High-quality materials are required.

The following three are known as conventional techniques used for the above purposes.

(1) So-called Stretched Bo
It is a method called "Ned Laminate" and
The process shown in FIG. That is, first, the elastic body is stretched, and in the stretched tensioned state, it is joined to the material by heat, ultrasonic waves, an adhesive or the like to form a combined body, and the tension of the combined body is removed to relax the elastic body. An elastic composite is obtained. Most of the elastic bodies applied to the waist and crotch of disposable diapers currently on the market are manufactured by this method.

(2) A method of exhibiting elasticity by thermal contraction, which comprises the steps shown in FIG. That is, after the latent elastic body having heat shrinkability and the non-stretchable material are bonded by ultrasonic waves, an adhesive, etc., the bonded body is treated in a heat atmosphere in a tension-free state to obtain a pleated elastic composite. A way to get a body. A part of this method is commercially available as a waist elastic body.

(3) The method proposed by Japanese Patent Laid-Open No. 59-59901, which comprises the steps shown in FIG. That is, a net-like elastic body in a relaxed state and a non-stretchable base material having relatively low stretchability such as PE and EVA-containing film are partially or discontinuously bonded, and the partially bonded body is When the base material is stretched under a high tension in a range of the allowable elongation of the base material to a necessary degree, the non-bonded portion of the base material portion is stretched while causing a larger permanent deformation as compared with the bonded portion. When tension is removed from such a stretched joint body and the elastic body portion is relaxed, a stretchable elastic composite body is obtained. This material has begun to be applied to elastic bandage bands, etc., but has a relatively low degree of elasticity to obtain a uniform elastic composite, and is industrially excellent for producing a material having elasticity in the length direction of the sheet. It is a method.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to an improvement of the above-mentioned third method, which makes it possible to obtain an elastic body industrially at low cost by selecting the materials to be used and optimizing the bonding conditions. A novel composite elastic body is provided by using such an elastic body.

[0009]

According to the present invention, first, a sheet-like elastic body in a relaxed state and a sheet-like material which is not stretched or pleated is formed, and the elastic body is formed on the base material. The sheets are continuously bonded in the machine direction (MD) and discontinuously bonded in the lateral direction (CD), and the base material has lateral extensibility, The elastic composite and the method for producing the same are characterized by not having elongation recovery. The present invention further comprises a sheet-like elastic body in a relaxed state and a sheet-like base material having stretched pleats, the elastic body being continuous with the base material in the length direction (MD) of the sheet. The elastic composite body is characterized in that it is bonded to the substrate in the transverse direction (CD) with discontinuity. Such an elastic composite is obtained by cutting the elastic composite described above from the elastic body and the substrate,
It can be manufactured by elongating to the elongation limit within a range not causing breakage to cause permanent deformation (please) in the substrate, and then relaxing the elongation.

The constituent elements of the present invention are, first of all, an elastic body and a base material which are materials constituting the elastic composite body,
The second is about the bonding state of the constituent materials, the third is about the stretching condition for optimizing the elasticity of the elastic composite, and the fourth is about the function and performance of the obtained elastic composite. is there. First, a sheet-shaped elastic body and a sheet-shaped base material that are constituent materials will be described.

First, as the sheet-like elastic body used in the present invention, a thin layer sheet of natural rubber, synthetic rubber or the like, a polyurethane film, a polyurethane meltblown nonwoven fabric,
Sheet-like elastic bodies such as styrene-butadiene block polymer film and polyolefin-based elastomer film can be used, but considering the adhesiveness with cost base material, EVA, ultra-low density LLDPE, ethylene-propylene elastomer, ethylene・ Polyolefin elastomer such as methyl acrylate elastomer alone or synthetic rubber thereof, styrene ethylene butadiene ・
A coextruded film of a blend of styrene block polymer (SEBS) or a polyurethane elastomer and a polyolefin elastomer is preferable. These polyolefin elastomers are characterized by low resin costs, easy melt extrusion molding, and industrially extremely inexpensive materials. Also with respect to the bonding with a base material described later, the bonding property is very good by thermocompression bonding, ultrasonic bonding or the like.
Moreover, what is important is that these polyolefin elastomers are extremely difficult to use as a single film. That is, the melting point is low, and so-called self-adhesion is likely to occur due to the property of the elastomer. Even if a single film is formed to obtain a rolled film, self-adhesion easily occurs at room temperature and stable unwinding is performed. Is extremely difficult. If you want to do this,
It is necessary to store, transfer, and store the film at a low temperature of 30 ° C or less during winding, and it is extremely difficult to handle as a single film. Therefore, it is difficult to use it for consumer products. Has been.

However, it has been found that the use of a composite with a non-woven fabric as in the present invention solves these handling problems and at the same time provides an elastic composite having extremely excellent performance. Of. Note that the elastic body used in the present invention does not need elasticity in the sheet direction in which the polymer is easily oriented, and only needs elasticity in the lateral direction. In this sense, the merit in production is further emphasized.

The performance of the substrate used in the present invention is as follows.
First, it is necessary that the material has high elongation in the CD direction. So-called MD and CD anisotropy, ie MD
A non-woven fabric having a small degree of elongation in the direction and excellent stability of direction and a large degree of elongation in the CD direction and easily deformable is desirable.

FIG. 1 is a diagram showing the nonwoven fabric substrate according to the stretching direction and C.
The state extended in the D direction is shown. Further, FIG. 2 shows the strength and elongation curves of the base material desirable for the present invention as a model.

Table 1 shows a typical example of a nonwoven fabric.

[0016]

[Table 1]

In Table 1, the numbers C and D are
It is a nonwoven fabric relatively oriented in the MD direction. Non-woven fabric made by connecting parallel card webs with high pressure water flow,
The non-woven fabric obtained by weaving filaments and tows has the above-mentioned properties and can be used as the base material of the present invention. On the contrary, a non-woven fabric having a small random difference between MD and CD and having a high randomness, for example, a spun-bonded non-woven fabric which is melt-spun, a non-woven fabric formed by a cross-wrapper web, etc., has a stable CD direction, and thus the object of the present invention. It doesn't fit in.

Among the above-mentioned non-woven fabrics, the non-woven fabric obtained by the hydroentangling method, which is a non-woven fabric having a high elongation and strength and a tenacity and a high tenacity, is suitable. Regarding the CD elongation required particularly, it is desirable to have a breaking elongation of at least 100% or more (2 times), and preferably 150% (2.5 times) or more. As the raw material fiber of the non-woven fabric, PE, PP, PE, which is a hydrophobic fiber which is preferably less wetted by water, less irritating to the skin and safe
1.5 d to 3 d synthetic fiber staples such as T are desirable.

The second important requirement, that is, the bonding state between the base material and the elastic body will be described in detail. The base material and the elastic body are shown in FIG.
As shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. 4, the elastic body and the base material are continuously coupled in the MD direction of the sheet (A portion), and there is a discontinuity in the CD direction of the sheet. It is necessary to have and combine (B). The joint portion A is a joint portion between the base material and the elastic body, and this portion is a fixing portion between the base material and the elastic body, and at the same time, the strength of the elastic body is reinforced by the base material. In the non-bonded portion B, it is necessary that the base material and the elastic body are not joined, or even if the joining is performed, the portion B is in a weakly joined state as compared with the portion A. The part B is a part that is expanded by the expansion operation described later, and the part A needs to be in a stable bond state that does not separate by the expansion, but the part B is in a state that does not hinder the extensibility as much as possible. is necessary.

Regarding the joining method, it is also possible to join the base material and the elastic body in a strand-like manner with an adhesive having a good binding property, but by using ultrasonic waves and thermocompression bonding, it is possible to increase the cost and production process. Is advantageous. The most preferable method is a method of completing the bonding with the non-woven fabric during the manufacturing process of the elastic body, which means, for example, as shown in the flowchart of FIG. 5, solvent extrusion of the raw material elastomer resin as the elastic body and cooling rolls. When the film is formed, the non-woven fabric as the base material is united, and then passed through a grid roll, and the grid portion is converted into the joint portion A by the pressure strengthening of the grid portion. At that time, it is also effective to bring the grid roll into a heated state. Next, the abundance ratio of A and B, which is rolled up into a product, and a desirable state will be described later. FIG. 6 is a conceptual diagram of this manufacturing apparatus.

A detailed explanation will be given on the third important requirement, that is, how to stretch a bonded body of an elastic body and a base material to develop a good elastic composite. The elastic performance of the elastic composite according to the present invention depends on the degree of elongation of the elastic body and the base material. This principle will be described with reference to FIGS.
Here, the elongation limit point is defined as the elongation degree immediately before reaching the breaking elongation, and if the elongation limit point of the elastic body is 200% and the elongation limit point of the nonwoven fabric that is the base material is 100%, the elasticity becomes as shown in FIG. The composite cannot be stretched by 100% or more, and the elastic composite obtained has a stretch elasticity within the range of 100%.

If the extension limit point of the elastic body is 200% and the extension limit point of the non-woven fabric as the base material is 250%, the elastic composite has a stretch elasticity of 200% as shown in FIG. Therefore, in order to obtain a more desirable elastic composite, it is understood how the optimum selection of the elastic body and the base material and the stretching condition thereof are important. FIG. 9 is a model showing the relationship between the physical properties of the elastic body, the physical properties of the base material, the physical properties of the bonded composite body, and the elongation limit point.

The degree of elongation generally used as an elastic body is in the range of 50% to 200% (1.5 times to 3 times).
If it is less than 0%, the elongation is insufficient. On the other hand, although many elastic bodies have a breaking elongation of 500% or more, the elongation range that can be put to practical use is 280 in consideration of elastic recovery.
%, More preferably 250% or less.

The extension limit point of the elastic composite is determined by comparing the extension limit point of the base material with the extension limit point of the elastic body, and the extension limit point of the lower numerical value determines the extension limit point of the elastic composite. Therefore, it is necessary to make the best use of the performance of the elastic body in order to increase the stretch elasticity as much as possible, and this is the reason why the extensibility in the CD direction of the base material is increased. In the example of FIG. 9, the extension limit point of the base material is 22
5% is the limit capacity of the elastic composite. However, even with such a potential, if the elongation is lowered, as shown in FIG. 10, if the elongation is only 100%, the elastic elasticity is 100% or less, and if the elongation is 150%, the elastic elasticity is 150% or less. If it can be expanded by 225%, it will have elastic elasticity of 225% or less.

Fourthly, what consideration is required to effectively use the elastic composite of the present invention obtained as described above by the waist elastic, crotch elastic, etc. of a disposable diaper. Will be described. In order to achieve the expected effect, the effects of the elastic body and the base material must be synergistically enhanced by compounding.

One of the important effects is the covering effect of the elastic body by the base material, and the soft feel and safety of the non-woven fabric can reduce chemical and physical irritation to the skin surface of the human body. The expected effect is that the elastic body is strengthened and stabilized by the presence of the joint portion due to the compounding. However, if the number of joints (A) increases, the composite strength will increase, but the elastic elasticity will decrease. Therefore, as shown in FIG. 11, the numerical value of the joint portion (A) and the ratio of the joint portion (A) and the non-joint portion (B), that is, A / (A
+ B) × 100 (%) is required to be appropriate. A must have a width of 0.5 m / m or more, preferably 1 m / m
m to 10 m / m, more preferably 2 m / m to 5 m / m. If it is 0.5 m / m or less, cutting and separation easily occur. Further, the ratio represented by A / (A + B) × 100 (%) is required to be 50% or less, and when it exceeds 40% to 50%, the elasticity of the composite elastic body is greatly reduced. Will be done. Furthermore, the expected effect is to handle and contribute to stabilization in processing.
The elastic body is easily affected by the tension in the process, and it is extremely difficult to handle such as winding and unwinding. Particularly, in the case of a polyolefin elastomer having a low melting point, self-adhesion is likely to occur and industrial handling is very difficult. However, all of these problems can be easily solved by forming a composite with a non-woven fabric.

The shape of the elastic composite is as shown in FIGS.
A sandwich-like structure in which base materials are bonded to both sides as shown in FIG. 3 is also possible. FIG. 12 shows a base material bonded to both sides of a single film elastic member, and FIG. The composite is superposed on the elastic member surface. These sandwich-like elastic composites also show very good stretch elasticity.

An example will be described below.

[0029]

【Example】

Example 1 Polyolefin elastomer (Copolymer of EVA and synthetic rubber) PFB-75 manufactured by Nippon Yunika Co., Ltd. was used as an elastic body.
0 m / min. Was melt-extruded to obtain an elastic film of 40 g / m ² . The breaking elongations at 25 ° C. of this film were MD 180% and CD 580%. According to the results of the cycle test of 5 times, if it was within 250% in the CD direction, good elastic recovery was exhibited although there was application relaxation.
Winding roll 2 of 1000 m in which this film is connected and wound.
I made a book. Both of the winding rolls could be unwound immediately after winding. One was left overnight at room temperature of 35 ° C. The other was left overnight in a cold room at 20 ° C. 20 ° C
However, the one left at room temperature of 35 ° C caused self-adhesion between the films and the unwinding was impossible.

On the other hand, as the non-woven fabric substrate, as shown in Table 1, a.
Spunbond, b. Thermal bond, c. Water flow coupling,
d. Four types of tow open weave were prepared. The physical properties of each non-woven fabric are as shown in Table 1.

According to the process shown in the first step of FIG. 14, an elastomer film is first melt-extruded as an elastic member under exactly the same conditions as described above, and after the film is formed, the above-mentioned four kinds of non-woven fabrics and the film are superposed and linear pressure is applied. Pressurization was performed at 0.5 kg / cm. The press roll was a Teflon / surface-treated roll on the film side, and the chrome-plated roll on the non-woven fabric side. After the compression, a winding roll was created. Immediately after winding, there was no problem and it was possible to unwind. This roll was allowed to stand overnight at room temperature of 35 ° C. In this case, although the unwinding load increased slightly, stable unwinding was possible. In the obtained pressed sheet, the nonwoven fabric and the elastic film show a temporary adhesion state, they are not separated in the normal state, they are joined so that they can be handled as an integrated sheet, and if they are peeled, they can be separated so that the film nonwoven fabric is not damaged. It was about.

Table 2 shows the performance of the united product in the temporarily bonded state obtained by passing the above-mentioned four kinds of non-woven fabrics and the elastic member through the process of the first step of FIG. 14 under the above conditions. That is, the combination of the non-woven fabric a and the non-woven fabric b showed almost no stretch elasticity.
The non-woven fabric c and the non-woven fabric d had phase separation in the two layers of the non-woven fabric and the film from the time of elongation of about 100% before breaking.

[0033]

[Table 2]

On the other hand, as an experiment, in the case of the non-woven fabric c, a heating roll of 100 ° C. was prepared as a pressure roll, and when passing through the non-woven fabric while applying heat, the non-woven fabric and the film were completely adhered to each other and phase-separated until fracture Did not happen,
The elastic elasticity of the elastic body has almost been lost.

Next, among the united products obtained from the process of the above first step, the nonwoven fabric c and the nonwoven fabric d are shown in FIG.
The process of step 2 of 5 was passed. That is, FIG.
A roll (grid roll) that has been fully cut in the circumferential direction as shown in (4) is heated to 100 ° C., a silicone rubber roll is combined with the lower part, and the nonwoven fabric is in contact with the heating roll side so that the linear pressure is 0.5 kg / cm. At 30 m / min. When it was passed through at a speed of, a composite elastic body was obtained in which the groove portions were completely joined and the other portions were in a pseudo-bonded state. The characteristics are shown on the right side of Table 2. As can be seen from the results, the elastic composite obtained by grit-processing the elastic film and the non-woven fabric c and the non-woven fabric d showed good stretch elasticity.

Example 2 Nonwoven fabric C shown in Table 1 was prepared as a non-woven fabric substrate, and Labraze resin manufactured by Tonen Kagaku was used as an elastic member (EVAS).
Incorporating a process as shown in Fig. 5 into the manufacturing process of the RR copolymer), melt-extruding a 35μ labraze film and compressing it together with the non-woven fabric, and then a protrusion of a mountain equipped with a steam heating device inside. Width 2 m / m, grit and grit valley interval 10 m / m, depth 1 m / m diameter 20
A non-woven fabric and a pressure-bonded material of an elastic member were passed between a 0 m / m chrome-plated grooved roll and a combination press of silicon rubber at 100 ° C. at a speed of 30 m / min. The surface of the non-woven fabric was brought into contact with the surface of the grid roll. The groove portion of the elastic composite thus obtained was completely bonded.
When the elastic composite was stretched by 200% in the groove direction and then the tension was relieved, the film and the non-woven fabric remained bonded to each other in the grit part, but in the other part, the film and the non-woven fabric were separated and the non-woven part was pleated. An elastic composite having good stretchability was obtained. After stretching this elastic composite to about 180% again, when it was attached to the non-woven fabric surface of the film part and the waist part of the commercially available paper diaper as shown in FIG. 17, a paper diaper with excellent stretchable waist gathers was obtained. It was

The sectional structure of the joint was as shown in FIG.

[0038]

INDUSTRIAL APPLICABILITY The present invention is an elastic composite that is particularly suitable for the waist and crotch of disposable diapers and the like, has a large degree of expansion and contraction, is stable, and is gentle on the skin. , Can be easily manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of elongation of a nonwoven fabric suitable for a substrate of the present invention.

FIG. 2 is a model curve showing the relationship between strength and elongation of the base material of the present invention.

FIG. 3 is a perspective view showing a bonded state of a base material and an elastic body in the present invention.

FIG. 4 is a cross-sectional view showing a bonded state of a base material and an elastic body in the present invention.

FIG. 5 is a process drawing showing the concept of the manufacturing process of the present invention.

FIG. 6 is a conceptual diagram of an apparatus suitable for the manufacturing method of the present invention.

FIG. 7 is an explanatory view of exhibiting elasticity by stretching the elastic composite body of the present invention.

FIG. 8 is an explanatory view of exhibiting elasticity by stretching the elastic composite body of the present invention.

FIG. 9 is a graph of physical properties and elongation limit points of the base material, the elastic body, and the composite material of the present invention.

FIG. 10 is an explanatory view of the extension limit of the elastic composite of the present invention.

FIG. 11 is an explanatory diagram of a relationship between a bonded portion and a non-bonded portion of an elastic body and a base material according to the present invention.

FIG. 12 is an explanatory diagram of an example of the composite elastic body of the present invention.

FIG. 13 is an explanatory diagram of another example of the composite elastic body of the present invention.

FIG. 14 is an explanatory diagram of a first step of the embodiment of the present invention.

FIG. 15 is an explanatory diagram of a second step of the embodiment of the present invention.

FIG. 16 is an explanatory diagram of a heating roll used in the manufacturing method of the present invention.

FIG. 17 is an explanatory diagram of a diaper used in another example of the present invention.

FIG. 18 is an explanatory diagram of a sectional structure according to a second embodiment.

FIG. 19 is an explanatory diagram of an example of a conventional example.

FIG. 20 is an explanatory diagram of another example of the conventional example.

FIG. 21 is an explanatory diagram of another example of the conventional example.

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[Procedure amendment]

[Submission date] May 12, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011] First as the sheet-like elastic body used in the present invention First, natural rubber, a thin layer sheet such as a synthetic rubber, polyurethane film and meltblown nonwovens, films and Merutobu styrene butadiene block polymer
Loan nonwoven, but sheet-like elastic body such as fill <br/> arm and meltblown nonwoven polyolefin elastomer can be used, considering the adhesiveness and the like between the cost and the substrate, E. V. A, V. L. L, D. P. E, ethylene
Polyolefin elastomer such as propylene elastomer and ethylene / methyl acrylate elastomer alone
And blended systems, and synthetic rubber and
S. E. B. S. (Styrene, ethylene, butadiene,
Styrene block polymer ) blended polymer
A film and a meltblown non-woven fabric, or a coextruded film of an elastomer such as polyurethane and the above polyolefin elastomer is preferable.
With these polyolefin-based elastomers as the main components
The cost is low and the melt moldability is excellent
It is possible to industrially manufacture elastic bodies that are relatively inexpensive.
become. Typical commercial products include, for example, Tonen Chemical
Brand name of "LABRAZE" of Kuraray Co., Ltd.
There are melt blown nonwoven fabrics such as "Septon". Moreover, what is important is that the above-mentioned polyolefin-based elastomer is a material that is extremely difficult to use as a single film. That is, the melting point is low, and so-called self-adhesion is likely to occur due to the property of the elastomer. Even if a single film is formed to obtain a rolled film, self-adhesion easily occurs at room temperature and stable unwinding is performed. Is extremely difficult. In order to make this possible, even when forming and winding the sheet,
It is necessary to perform storage, transfer and storage at a low temperature of 30 ° C. or lower, and it is a material that is extremely difficult to handle with a single film, and therefore it has been considered difficult to use as a consumer product.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016]

[Table 1]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

[0017] The numbers in this table c, what was shown in d,
It is a non-woven fabric having a high degree of elongation and extensibility in the CD direction and can be used as the substrate of the present invention. On the contrary, a non-woven fabric having a small difference in the MD and CD directions and a small elongation in the CD direction and a high randomness, such as a and b in the table,
It is not suitable as a base material.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

On the other hand , as a non-woven fabric substrate, as shown in Table 1.
Do not, a. Spunbond (random) , b. Thermal bond, c. Spunbond (semi-random) , d. Water exchange
Tangle, e. Five types of tow opening were prepared. The physical properties of each non-woven fabric are as shown in Table 1.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

According to the process shown in the first step of FIG. 14, an elastomer film is first melt-extruded as an elastic member under exactly the same conditions as described above, and after the film is formed, the above-mentioned four kinds of non-woven fabrics and the film are superposed and linear pressure is applied.
Pressurization was performed at 5 kg / cm. The press roll was a Teflon / surface-treated roll on the film side, and the chrome-plated roll on the non-woven fabric side. After the compression, a winding roll was created. Immediately after winding, there was no problem and it was possible to unwind. This roll was allowed to stand overnight at room temperature of 35 ° C. In this case, although the unwinding load increased slightly, stable unwinding was possible. In the obtained pressed sheet, the nonwoven fabric and the elastic film show a temporary adhesion state, they are not separated in the normal state, they are joined so that they can be handled as an integrated sheet, and if they are peeled, they can be separated so that the film nonwoven fabric is not damaged. It was about.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

Table 2 shows the performance of the united sheet in the temporarily bonded state in which the above-mentioned five kinds of non-woven fabrics and the elastic member are passed through the process of the first step of FIG. 14 under the above conditions. That is , the combined sheet of the nonwoven fabric a and the nonwoven fabric b with the elastic film showed almost no stretch elasticity. Non-woven fabric c, non-woven fabric d 3 , non-woven fabric
Cloth e is non-woven fabric with 100% before and after the extension degree before reaching the break
And separated into two layers of film.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[0033]

[Table 2]

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

On the other hand , as shown in the bottom column of Table 2,
In the case of the non-woven fabric d , when the non-woven fabric and the elastic film are united with a heating roll having a surface temperature of 100 ° C. , the non-woven fabric and the elastic film are almost completely adhered to each other until they are broken.
2 layers did not separate, but Shin contraction elasticity was Tei gone almost lost.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

Next, among the temporarily bonded united sheets obtained from the processing and process of the first step shown in Table 2, a united sheet of nonwoven fabric c, nonwoven fabric d, nonwoven fabric e and elastic film is shown in FIG. The process of step 2 of 1. was passed.
That is, a roll (grid roll) having grooves cut in the circumferential direction as shown in FIG. 16 is heated to 100 ° C., a silicone rubber roll is combined with the lower part, and the nonwoven fabric is brought into contact with the heating roll side so that the linear pressure is 5 30 m / mi in kg / cm
When it was passed at a speed of n, a composite elastic body was obtained in which the groove portions were completely joined and the other portions were in a pseudo-bonded state. The characteristics are shown on the right side of Table 2. As can be seen from the results, the elastic film and the non-woven fabric c, non-woven fabric d 1 , non-woven fabric e
The elastic composite obtained by grid-working showed good stretch elasticity.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

The sectional structure of the joint was as shown in FIG. Example 3 Melt blown from Septon (SIS) of Kuraray Co., Ltd.
In the process of manufacturing meltblown nonwoven fabric by the method
, A net with a suction section that collects elastic fibers
Pre-spun polyester spun on Table 1 on the conveyor
While supplying the lace non-woven fabric d, the elastic fabric is placed on the non-woven fabric.
A ltblown nonwoven fabric (30 g / m ² ) was formed. One
Then melt-blown non-woven fabric by heating roll at 60 ℃
After joining the fibers and temporarily joining the base nonwoven fabric d,
In the next step, heating grid rolls with a surface temperature of 130 ° C
50m / between a pair of press rolls consisting of rat rolls
It was passed at min. The degree of pressurization is 12 kg / cm
It was The heating was performed from the polyester nonwoven fabric side. Also
The width of the grid part of the grid roll is 1.5 mm,
The distance between the dots was 5 mm. The linear heating section loses elasticity.
The ginger has a very good adhesion, and the unheated part is very good.
Maintained good elasticity. This joint is stretched by 200%
When combined, the non-woven fabric becomes a channel-shaped composite with good air permeability.
An elastic body was obtained.

Claims (14)

[Claims] 1. A sheet-like elastic body in a relaxed state and a sheet-like base material that is not stretched or formed with folds, and the elastic body is formed on the base material in a longitudinal direction (MD) of the sheet. Are connected continuously in the lateral direction (CD)
The elastic composite body is characterized in that the base material is bonded with discontinuity, and the base material has extensibility in the CD direction but does not have extension recovery property. 2. The elastic composite body according to claim 1, wherein the elastic body is a polyolefin elastomer having thermocompression bonding properties. 3. The elastic composite according to claim 1, wherein the base material is a non-woven fabric whose main component is a thermocompression-bonding synthetic fiber. 4. The elastic composite body according to claim 1 or 2, wherein the elastic body has low extensibility in the longitudinal direction (MD) of the sheet, and has relatively greater extensibility in the lateral direction (CD) than twice. 5. The elastic composite according to claim 1 or 3, wherein the base material has low extensibility in the length direction (MD) of the sheet and has at least twice the extensibility in the transverse direction (CD). 6. The elastic composite according to claim 4 or 5, wherein the elongation in the CD direction is 100% or more. 7. The bonding state between an elastic body and a base material according to claim 1, comprising a strand-shaped bonded portion A and a non-bonded portion B in the MD direction, and A / (A + B) × 100 (%) 5-40% elastic composite. 8. The elastic composite according to claim 3, wherein the base material is obtained by a hydroentangling method. 9. A sheet-like elastic body in a relaxed state and a sheet-like base material having a degree of extensibility comparable to that of the elastic body but not having elongation recovery are continuous in the length direction (MD) of the sheet. A method for producing an elastic composite, characterized in that the elastic composite is formed by discontinuously bonding in the lateral direction (CD) of the sheet. 10. A polyolefin elastomer having thermocompression bonding property as a sheet-like elastic body is extruded in a molten state,
The method for producing an elastic composite body according to claim 9, wherein after being cooled, it is pressure-bonded to a sheet-shaped base material made of a non-woven fabric, and is further passed between rolls having grooves to form a strand-shaped strongly pressure-bonded portion. 11. A sheet-shaped elastic body in a relaxed state and a sheet-shaped substrate having stretched pleats,
An elastic composite body, wherein the elastic body is continuously bonded to the base material in a length direction (MD) of the sheet, and is bonded discontinuously in a lateral direction (CD). 12. The elastic composite body according to claim 11, wherein the relationship between the length (P) of the elastic member and the total length (Q) of the base material including the folds is Q / P ≧ 1.5. 13. The elastic composite body according to claim 12, wherein the base material having pleats is formed on both surfaces of the elastic body as a core material. 14. A sheet-like elastic body in a relaxed state and a sheet-like base material having the same extensibility as that of the elastic body but having no elongation recovery are transversely continuously in the longitudinal direction (MD). To form an elastic composite by bonding with discontinuity in the direction (CD), and then extending this elastic composite to the extension limit within the range where the elastic material does not cause cutting or breaking of the base material. A method for producing an elastic composite, comprising causing permanent deformation and then relaxing elongation.