JPH11279876A - Raw yarn for adhesive tape base fabric, method for producing the same, and adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a raw yarn for adhesive tape base fabrics having good hand-tearing property while maintaining proper strength and excellent in spreading of resin in resin finishing and provide a method for producing the raw yarn for an adhesive tape base fabric and obtain an adhesive tape. SOLUTION: This raw yarn for adhesive tape base fabrics comprises a false twist processed yarn having 2-7 deformation degree of single yarn cross section and has 1.0-3.0 g/d strength and 10-20% elongation. This yarn for adhesive tape base fabrics is obtained by subjecting a polyester multifilament undrawn yarn having 2-7 deformation degree of single yarn cross section to false twist processing in a false twist number T (times/m) of 26500/√ D to 34900/√ D (D: total fineness after false twisting) at 170-250 deg.C first heater temperature and subjecting the treated yarn to heat setting treatment at 140-230 deg.C second heater temperature. The adhesive tape is composed of a base fabric using the yarn as warps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base yarn for a base fabric of an adhesive tape, a method for producing the same, and an adhesive tape comprising the base yarn.

[0002]

2. Description of the Related Art The required characteristics of an adhesive tape are that the adhesive tape has a high strength and that the tape itself has an appropriate strength. However, the strength largely depends on the base fabric of the adhesive tape. However, the adhesive tape may be used with scissors when cutting the tape, but is often cut by hand from the viewpoint of workability. Therefore, it is required that the pressure-sensitive adhesive tape has an appropriate strength and a good hand-cutting property.

Conventionally, as a measure to meet the above demand, it has been proposed to use a false twisted yarn as a base yarn for a base fabric. However, as long as a conventional circular cross-section yarn is used, obtaining a textured yarn that satisfies the above-mentioned requirements with balanced elongation characteristics can be achieved by yarn breakage during melt spinning or yarn during false twisting. It was difficult to manufacture without causing troubles in the manufacturing method such as cutting.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, to obtain a good hand-cutting property while maintaining an appropriate strength, and to provide an excellent resin riding property during resin processing. An object of the present invention is to provide a raw yarn for an adhesive tape base fabric, a method for producing the same, and an adhesive tape.

[0005]

According to the present invention, there is provided a pressure-sensitive adhesive tape base fabric yarn having the single yarn cross-section having a degree of deformation of 2-7.
Is a false twisted yarn made of a non-circular polyester multifilament having a strength of 1.0 to 3.0 g /
d. The elongation is 10 to 20%.

The method for producing a base yarn for a base cloth of an adhesive tape according to the present invention comprises the steps of: forming a non-circular polyester multifilament undrawn yarn having a single yarn cross section of 2 to 7 in a false twist number T (twice /
m) 26500 / √D to 34900 / √D (where D:
Total fineness after false twisting), heater temperature 170-250 ° C
False twisting, then heater temperature 140-230 ° C
And a heat setting process.

In the pressure-sensitive adhesive tape of the present invention, a base cloth is woven with the above-mentioned base tape for a pressure-sensitive adhesive tape as a warp, and one side of the base cloth is coated with a resin, and an adhesive is coated on the opposite side. It is characterized by having done.

[0008] As described above, by using a polyester multifilament false twisted yarn having a non-circular shape having a degree of deformation of 2 to 7 which is higher than a circular shape in a single yarn cross section, the strength and elongation can be reduced. In addition to the appropriate strength, the hand-cutting property is improved and the non-circular yarn is false-twisted, so that the riding property of the resin in the resin processing after forming the base cloth can be improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester used in the present invention is not particularly limited as long as it has a spinning property.
Preferably, polyethylene terephthalate is used as a main component. If necessary, additives such as a matting agent, a stabilizer and a surface modifier can be added to the polyester.

The raw yarn for a pressure-sensitive adhesive tape base fabric of the present invention comprises a polyester multifilament false twisted yarn having a non-circular single yarn cross section. The degree of deformation of the non-circular cross section is 2 to 7, and is characterized by being considerably deformed as compared with a circular shape. Preferably, it has a substantially flat cross section. As described above, since the degree of deformation is 2 or more and false twisting is performed, strength and elongation can be suppressed to a low level, and the required strength as an adhesive tape can be maintained and good hand-cutting properties can be guaranteed. When the degree of deformation is less than 2, that is, in a state close to a false twisted yarn from a normal circular cross-section yarn, strength and elongation tend to be high, so that good hand-cutting properties cannot be obtained. The residual torque also increases, and the base fabric shape becomes unstable.
When the degree of deformation is greater than 7, the spinnability deteriorates, and it becomes difficult to obtain the raw yarn of the present invention.

[0011] In the present invention, the "deformation degree", as shown in FIG. 1, the maximum length L ₁ in cross-section of the filament f, measured in a direction perpendicular to the side direction of the maximum length L ₁ refers to a value represented by the maximum length L ₂ and the ratio L ₁ / L ₂ when the. Although FIG. 1 shows an undrawn yarn, the measurement is similarly performed for a false twisted yarn.

The strength of the yarn of the present invention is 1.0 to 3.0 g /
d, which is lower than the original yarn strength of the false twisted yarn generally used for clothing, thereby improving the hand-cutting property. If the strength is higher than 3.0 g / d, the hand-cutting property is deteriorated. On the other hand, if it is smaller than 1.0 g / d, it becomes difficult to provide the necessary strength as an adhesive tape. In addition, yarn breakage frequently occurs during false twisting, making it difficult to maintain good productivity.

From the above viewpoint, the strength of the raw yarn of the present invention is preferably 1.2 to 3.0 g / d, more preferably 1.5 to 3.0 g / d. The elongation of the yarn for the adhesive tape base fabric of the present invention is set to 10 to 20%. If the elongation is more than 20%, the elongation when cutting the adhesive tape by hand is large, and the hand-cutting property is deteriorated. Elongation is 1
If it is less than 0%, yarn breakage frequently occurs during false twisting, and it becomes difficult to stabilize the operation.

The elongation of the yarn of the present invention is preferably from 12 to
It is good to be 20%, more preferably 14-20%. The above-described yarn for a pressure-sensitive adhesive tape base fabric of the present invention can be manufactured by a manufacturing method as described below.

First, polyester is made into an undrawn yarn by a melt spinning method, and is spun from a die having a non-circular cross-section spinning hole so that each single yarn becomes a multifilament having a non-circular cross section. The shape of the non-circular cross section is such that the degree of deformation of the single yarn cross section is 2 to 7.
If it is, there is no particular limitation. For example, FIG. 1 and FIG.
To (C). In particular, a flat cross section as shown in FIG. 1 is preferable. The original yarn for the pressure-sensitive adhesive tape base fabric of the present invention is obtained by irregularly deforming the undrawn yarn by false twisting,
If the degree of deformation of the undrawn yarn is 2 to 7, the yarn after false twisting will have substantially the same degree of deformation.

As the undrawn yarn used in the production of the raw yarn of the present invention, a highly oriented undrawn yarn called so-called POY is preferably used, and the spinning speed is preferably 3,000 m / min.
It is better to have one picked up at the above high speed.

By subjecting the undrawn yarn obtained as described above to the following simultaneous drawing and false twisting step, the raw yarn for the adhesive tape base fabric of the present invention can be obtained. The false twisting machine is preferably a triaxial friction false twisting machine. The number of false twists T (times / m) given in this simultaneous stretching false twisting step is 26500 / √D to 3490.
0 / √D, preferably 2800 / √D to 30000 / √
D (where D is the total fineness of the yarn after false twisting), and the false twisting temperature (first heater temperature) is 170 to 250.
° C, preferably 180 to 230 ° C.

If the number of false twists T (twice / m) is less than 26500 / √D, the crimping properties will be insufficient, the riding property of the resin in making the adhesive tape will be insufficient, and the hand-cutting property will be poor. become worse. On the other hand, if it exceeds 34900 / √D, fluff and thread breakage increase, so that operability becomes unstable and it becomes difficult to maintain the required strength as an adhesive tape.
On the other hand, if the first heater temperature is lower than 170 ° C., the crimp will be insufficient, and the riding property of the resin will be deteriorated. But 250
If the temperature is higher than ° C., the operation becomes difficult, and the handling during processing when the false twisting machine is stopped or started becomes difficult.

The temperature of the second heater for heat setting after the false twisting is 140 to 230 ° C., preferably 160 to 21 ° C.
0 ° C. If the temperature is lower than 140 ° C., the suppression of crimping is insufficient, and the feeling of bracket as an original thread for the adhesive tape base fabric is insufficient. On the other hand, when the temperature is higher than 230 ° C., the crimping properties are too low, so that the riding property of the resin is deteriorated.

The raw yarn of the present invention obtained as described above is woven into a pressure-sensitive adhesive tape base fabric as a warp. The same raw yarn may be used for the weft, but usually, a yarn having a higher strength and elongation than the raw yarn of the present invention is used.

The base fabric thus obtained is then processed with a resin. Generally, a polyethylene resin or the like is melt-extruded into a film, and this is laminated on one surface. Further, a release agent is applied to the surface of the resin after lamination, and an adhesive is applied to the surface of the base fabric opposite to the side on which the resin is laminated, whereby the adhesive tape is completed.

[0022]

EXAMPLE Polyethylene terephthalate was spun at a spinning temperature of 28.
At 0 ° C., spinning was performed from a spinneret having 24 slit spinning holes, and winding was performed at a spinning speed of 3300 m / min to obtain a highly oriented undrawn yarn. Next, this undrawn yarn was false-twisted at a draw ratio of 1.53 using a triaxial friction false twisting device,
In producing a 75-denier, 24-filament original yarn for an adhesive tape base fabric, the number of false twists (times / m) at the time of false twisting after the deformation of the single yarn cross section of the undrawn yarn as shown in Table 1, The heater temperature (° C.) and the second heater temperature (° C.) were different. (Examples 1 to 8, Comparative Examples 1 to 8)

Table 1 shows the strength and elongation of the false twisted yarn obtained from each of the examples and comparative examples. The yarn breakability during melt spinning and false twisting is as shown in Table 1, and Comparative Examples 2, 4 to
8 had a problem.

Further, as described above, the 16 types of false twisted yarns are used as warps, respectively, and 100 denier, 24
Filament polyester flat yarn (strength 5.
(2 g / d, elongation: 33%) was used as a weft to obtain a greige machine having a warp density of 50 yarns / inch and a weft density of 40 yarns / inch. Using this as a base cloth, a polyethylene film having a thickness of 50 μm was melt-extruded and laminated. Next, a release agent was applied to the side on which the polyethylene film was laminated, and an acrylic resin type adhesive was applied to the opposite side where no polyethylene film was laminated, thereby producing 16 types of pressure-sensitive adhesive tapes.

When the hand-cutting properties of these 16 kinds of adhesive tapes were evaluated, the results shown in Table 1 were obtained.

[0026]

[Table 1]

[0027]

As described above, according to the present invention, since a polyester multi-filament false twisted yarn having a single yarn cross section higher in deformation than a circular shape is used, the strength and elongation of the base fabric are reduced. While maintaining an appropriate strength for the adhesive tape base fabric, the hand-cutting property can be improved.
In addition, since the non-circular cross-section yarn is false twisted, it is possible to improve the riding property of the resin during resin processing after forming the base cloth.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a single yarn of an undrawn yarn used for producing a base yarn for an adhesive tape base fabric of the present invention.

FIGS. 2 (A), (B), and (C) are single yarn cross-sectional views of another example of an undrawn yarn used for producing a base yarn for a pressure-sensitive adhesive tape base fabric of the present invention.

[Explanation of symbols]

 f filament

Claims (6)

[Claims] 1. A false twisted yarn comprising a non-circular polyester multifilament having a degree of deformation of 2 to 7 in a single yarn cross section, wherein the processed yarn has a strength of 1.0 to 3.0 g / d and an elongation of 1
0 to 20% of the original yarn for the adhesive tape base fabric. 2. The single yarn cross section is substantially flat.
The raw yarn for an adhesive tape base fabric according to 1. 3. A non-circular polyester multifilament undrawn yarn having a single yarn cross section of a degree of deformation of 2 to 7 is prepared by a false twist number T (twice /
m) 26500 / √D to 34900 / √D (where D:
Total fineness after false twisting), heater temperature 170-250 ° C
False twisting, then heater temperature 140-230 ° C
And a method for producing a base yarn for an adhesive tape base fabric to be heat set. 4. The single yarn cross section is substantially flat.
3. The method for producing a raw yarn for a pressure-sensitive adhesive tape base fabric according to item 1. 5. The method according to claim 3, wherein the polyester multifilament unstretched yarn is a highly oriented unstretched yarn wound at a spinning speed of 3000 m / min or more. 6. An adhesive formed by weaving a base cloth using the raw yarn according to claim 1 or 2 as a warp, coating a resin on one side of the base cloth, and applying an adhesive on the opposite side. tape.