JPH07258949A - Production of fibrous web and device therefor - Google Patents

Abstract

PURPOSE:To obtain a fibrous web by using a collision member satisfying all of the characteristics, i.e., high opening ability, long service life, light weight and easily processing ability as the requirements for this member in order to open yarns by making use of static electrification due to collision or fretting. CONSTITUTION:Continuous multifilament yarns Y delivered from a spinneret 1 are subjected to suction by a yarn suction means 3 and then made to impinge on abrade through a collision member 5 to open the yarns Y or make them diverge, thus obtaining the objective sheetlike fibrous web W. In this case, at least the surface of this collision member 5 on which yarns Y are to impinge consists of nickel silver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in the production of spunbond and the like, collides or abrades continuous multifilament yarns against a collision member to open and spread the continuous multifilament yarns to produce a fiber web. Method and apparatus.

[0002]

2. Description of the Related Art A fiber web production apparatus for directly forming a sheet-like web by sucking a multifilament yarn being spun from a spinneret by a suction device and opening and spreading the fiber web is disclosed in JP-A-60-162852. As represented by the publication, it is currently commonly used as a spunbond manufacturing apparatus. Stabilization of production conditions is an important issue in improving productivity with such a manufacturing apparatus, and among them, stabilization of opening conditions is one of the most important ones. For this reason, various techniques have been conventionally proposed for the method of opening a continuous multifilament. Generally well-known methods include a method of improving openability by increasing the amount of compressive fluid supplied to the yarn suction device, and JP-B-59-59.
-17212, Japanese Patent Publication No. 59-20013,
As represented by JP-A-60-119258,
How to use a shock member where the yarn is easily electrostatically charged,
There is known a method of using a piezoelectric element for a collision member as in Japanese Patent Publication No. 63-42015.

However, although the method of increasing the supply amount of the compressive fluid is effective in improving the openability, it causes an increase in the production cost and disturbs the air flow of the entire fiber web manufacturing apparatus to reverse it. However, there are many problems such as poor product quality. Further, in a method of using a collision member such as Japanese Patent Publication No. 59-17212 and Japanese Patent Publication No. 59-20013, in which the yarn is prone to be electrostatically charged, the collision member having good spreadability is opened. There is a problem that the opening property is not sufficient for a collision member having a good property, that is, a short life and a long life. In addition, Japanese Examined Japanese Patent Publication Sho 63-42
In the method of forming the collision member on the downstream side of the yarn suction device with a piezoelectric element as in Japanese Patent Publication No. 015, the spreadability is improved, but the collision plate has a long life as a piezoelectric element electrode (for example, silver or aluminum vapor deposition). ) Depends on the wear resistance of
It had the drawback of being extremely short.

Among the methods of opening a fibrous material by electrostatic charging, a collision member typified by Japanese Patent Publication No. 59-17212 and Japanese Patent Publication No. 59-20013 mentioned above is used, in which the yarn is easily electrostatically charged. The method is a convenient method, which has a good openability of the yarn despite the cheap production equipment, and is a method that is often used. However, in the method of opening the yarn using electrostatic charging due to collision or rubbing, the material of the member for collision or rubbing is the most important factor that determines the openness of the yarn and the period during which the condition can be maintained, that is, the life. However, the conditions required for the members are high openability, long life,
No material has yet been found that satisfies all of weight reduction and workability.

A method of opening the yarn by electrostatic charging by collision or rubbing is disclosed in Japanese Patent Publication No. 59-1721.
As disclosed in Japanese Patent Laid-Open No. 2 (1994), use of a metal mainly composed of zinc, zinc oxide or copper has been proposed as an opening member. Further, Japanese Patent Publication No. 59-20013 proposes one containing lead as a main component, and Japanese Patent Publication No. 60-119258 proposes one containing bismuth as a main component. However, zinc and copper disclosed in Japanese Examined Patent Publication No. 59-17212 have insufficient opening properties, and the Japanese Examined Patent Publication No.
The lead disclosed in Japanese Patent Publication No. 20013 has good openability, but has a short life, and since the openable member becomes heavy, there is a problem that a special device is required to facilitate replacement. Also,
The bismuth disclosed in Japanese Examined Patent Publication No. Sho 60-119258 has a drawback that the workability is poor and the spread member is very expensive. Under such circumstances, there has been a long-awaited demand for the development of an opening member which is lightweight, has a high opening property, has a long life and is easy to process.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a member for opening a yarn by using electrostatic charging due to collision or rubbing in a method for opening the yarn and producing a fiber web. An object of the present invention is to provide a collision member satisfying all of the required conditions such as high openability, long life, light weight, and workability.

[0007]

According to the method for producing a fiber web of the present invention which meets the above objects, a continuous multifilament yarn spun from a spinneret is sucked by a yarn suction means, and then the continuous multifilament yarn is spun. Characterized in that at the time of producing a sheet-like fiber web by opening and spreading the yarn by colliding or rubbing with a colliding member, nickel silver is used for at least the yarn colliding surface of the colliding member. Consist of way.

[0008] That is, the inventors of the present invention, as a result of earnest study,
In the method of opening a continuous multifilament yarn by colliding or rubbing with a member, it was found that nickel silver, that is, an alloy mainly composed of copper, zinc and nickel, is excellent for the member, and the present invention has been achieved. It was

Further, the addition of zinc to nickel silver has the effect of improving the castability, but if it is too much, corrosion resistance and strength decrease. On the other hand, the addition of nickel has the effect of improving corrosion resistance and mechanical properties, but if it is too large, the melt casting operation becomes difficult. In the present invention, in order to obtain excellent spreadability and life, the collision surface has a total content of copper, zinc and nickel of 97% or more, and copper 54% or more and nickel 8.5%.
As described above, it is desirable that nickel white is used in which lead is 1.8% or less, iron is 0.25% or less, manganese is 0.5% or less, and the balance is zinc.

Further, the fiber web manufacturing apparatus according to the present invention comprises a spinneret for continuously spinning a multifilament yarn, a yarn suction means for sucking a yarn spun from the spinneret, and a suction device. A fiber web manufacturing apparatus having a yarn opening and spreading member for colliding or abrading the formed yarn, wherein at least the yarn colliding surface of the colliding member is formed of nickel silver.

The nickel-white forming the yarn-impacting surface is
The total content of copper, zinc and nickel is 97% or more, and
It is desirable that copper is 54% or more, nickel is 8.5% or more, lead is 1.8% or less, iron is 0.25% or less, manganese is 0.5% or less, and the balance is zinc.

[0012]

In the above-described method for producing a fibrous web, the multifilament yarn is collided or rubbed against the yarn colliding surface of the colliding member made of nickel silver, whereby the filament is effectively opened and spread. This is because, when the multifilament yarn collides or scratches, nickel silver tends to emit electrons as compared with other members,
It is considered that this is because the charge amount of the multifilament yarn increases.

[0013] Further, nickel silver has a total content of copper, zinc and nickel of 97% or more, 54% or more of copper, 8.5% or more of nickel, 1.8% or less of lead and 0.25% or less of iron. , Manganese 0.5% or less, and the balance being formed of zinc, the appropriate corrosion resistance, mechanical properties and workability of the collision member are ensured, while the spreadability and life are more effective. Will be improved.

Further, in the above-described fiber web manufacturing apparatus, the multifilament yarns collide with or scrape against the yarn colliding surface of the colliding member made of nickel silver. Since nickel silver is more likely to emit electrons when colliding or rubbing the multifilament yarn than other members, the electrification amount of the multifilament yarn is consequently increased. Therefore, it is considered that the multifilament yarn is effectively opened and spread.

The nickel-white composition is such that the total content of copper, zinc and nickel is 97% or more, and copper 54% or more, nickel 8.5% or more, lead 1.8% or less, iron 0.25%. Less than,
When the content of manganese is 0.5% or less and the balance is made of zinc, it is possible to obtain a collision member having excellent corrosion resistance, mechanical properties, workability as well as excellent openability and life. it can.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an apparatus for manufacturing a fiber web according to an embodiment of the present invention. In the figure,
Reference numeral 1 denotes a melt spinning spinneret having a large number of discharge holes (in this embodiment, a spinneret having 60 spinner holes is used), and a multifilament yarn Y made of, for example, polyethylene terephthalate is melt-spun from the spinneret 1. A heating and heat retaining section 2 is provided around the spinneret 1 to reduce the melt viscosity of the multifilament yarn Y to enhance the spinnability.

Reference numeral 3 is a yarn suction means, which is a high-pressure high-speed fluid (in the present embodiment, the supply pressure is 5 kgf /
The multifilament yarn Y melt-spun from the spinneret 1 is sucked at high speed by the ejector effect of (using air of cm ² ). A yarn cooling device (not shown) is installed between the heating and heat retaining section 2 and the yarn suction means 3 so that the molten polymer does not enter the yarn suction means 3. A drawing pipe 4 is connected to the downstream side of the yarn sucking means 3, and the multifilament yarn Y is moved in the drawing pipe 4 by the air which is a high-speed fluid jetted from the yarn sucking means 3. It is designed to be towed with the accompanying force and to be highly stretched by its traction force. The multifilament yarn Y sucked together with the high-pressure high-speed fluid is discharged together with the high-speed fluid from the lower end 4a of the drawing pipe, and the yarn collision surface 5 of the collision member 5 obliquely installed in the filament yarn traveling direction.
a collides. Due to this collision, the multifilament yarn Y is electrostatically charged and changes direction, and when the direction is changed, the fibers are opened and spread by the action of the high-speed fluid and static electricity. In addition, in this example, the traveling speed of the multifilament yarn was set to 5000 m / min.

A rectifying mechanism (not shown) including a large number of nozzles is arranged inside the yarn suction means 3. Therefore, the high-speed pressure fluid supplied to the yarn suction means 3 has a uniform distribution in the yarn suction means 3 without density unevenness. Therefore, the high-speed fluid ejected from the lower end 4a of the drawing pipe becomes a substantially straight direct jet flow and does not swirl. Therefore, the false twist is not given to the multifilament yarn Y, and the multifilament yarn Y does not cause fusion even on the upstream side thereof.

The collision member 5 is made of nickel silver.
The total content of copper, zinc and nickel is 97% or more in nickel silver, and 54% or more of copper and nickel 8.
5% or more, lead 1.8% or less, iron 0.25% or less, manganese 0.5% or less, and the balance being zinc.

The collision members 5 are provided corresponding to the respective spinning heads, a plurality of the collision members 5 are arranged in a row so as to cross the net conveyor 6, and each of them performs a swinging motion to the left and right. It is like this. The plurality of collision members 5 perform a swinging motion to the left and right (in the direction of the arrow in the figure) by a drive device (not shown), and further widen the multifilament yarn Y which is turned by collision to expand the air suction means 7. The sheet-like fibrous web W having a uniform thickness is formed on the net conveyor 6 having.

In the apparatus of the above-mentioned embodiment, the method for producing a fiber web according to the present invention is carried out as follows. First, the multifilament yarn Y is continuously melt-spun from the spinneret 1. Multifilament yarn Y
Is sucked by the yarn suction means 3 and sent into the drawing pipe 4. The multifilament yarn Y drawn in the drawing pipe 4 is jetted together with air from the lower end 4a of the drawing pipe. The multifilament yarn Y ejected from the lower end 4a of the drawing pipe is the yarn collision surface 5 of the collision member 5.
It collides with or is abraded.

Since the yarn colliding surface 5a is formed of nickel silver having excellent spreadability and spreadability, the multifilament Y collided with this surface is effectively opened and spread. It is considered that this is because the nickel silver collides with the multifilament Y or is rubbed to emit a large amount of electrons, and the emitted electrons charge the multifilament Y.

Further, the surface hardness of nickel silver is extremely higher than that of a metal (eg, lead) which has been conventionally used as a collision member, so that it is not easily worn or damaged. Therefore, the life of the collision member 5 can be extended.

The specific gravity of nickel silver is about 8.8, which is smaller than the specific gravity of lead of 11.4, for example. Therefore, the weight when the collision members 5 having the same size are formed is reduced, and the weight is reduced.

Further, in the present embodiment, the composition of the nickel silver forming the collision member 5 contains 97% or more of the total content of copper, zinc and nickel, and 54% or more of copper.
Nickel 8.5% or more, lead 1.8% or less, iron 0.25%
Hereinafter, manganese is 0.5% or less and the balance is zinc. The addition of zinc has the effect of improving castability,
If it is too large, the corrosion resistance will be reduced. On the other hand, addition of nickel has the effect of improving corrosion resistance and mechanical properties, but if it is too large, the melt casting operation becomes difficult.

Therefore, by setting the composition of nickel-white copper, zinc, and nickel as described above, the corrosion resistance of the collision member 5
Good balance of mechanical properties and workability and good maintenance.

Moreover, since the collision member 5 is made of nickel silver, the above-mentioned corrosion resistance, mechanical characteristics, and workability are ensured, and the multifilament Y is satisfactorily and effectively opened and spread. Is achieved, and the life of the collision member 5 is extended.

In the above embodiment, the collision member 5 is entirely made of nickel silver, but the same action and effect can be obtained by forming only the yarn collision surface 5a of nickel silver.

Example 1 and Comparative Examples 1 to 4 Next, the continuous multifilament Y being spun from the spinneret 1 is sucked by the yarn suction means 3 and opened and spread to directly form a sheet-like fiber web. At the time of production, the evaluation results of the openability and the life, which are one of the most important things when improving the productivity, will be described. A fiber web manufacturing apparatus for sucking a multi-filament thread being spun from a spinneret shown in FIG. 1 by a thread suction means 3 and performing fiber opening and spreading to directly form a sheet-shaped web,
The openability and the life were evaluated. As shown in FIG. 2, the continuous multifilament yarn Y traveling from the upper side to the lower side is collided with the yarn collision surface 5a of the collision member 5 which is obliquely positioned so as to block it, and the collecting net 6 It was collected on the top and used as a sheet W. At this time, the width of the sheet-like material in the direction orthogonal to the advancing direction of the collecting net, that is, the opening width, the electrostatic charge amount of the multifilament yarn Y, and the like were measured and summarized in Table 1. The spinning conditions at this time were such that polyethylene terephthalate was used as the polymer, the number of single filaments of the multifilament yarn was 60, the single yarn fineness of the yarn was 2d, and the yarn running speed was 5000 m / min.

The shape and mounting conditions of the collision plate 5 used this time are 200 mm in width and 1.5 in thickness t.
2, the length L shown in FIG. 2 is L = 20 mm, the lower end 4a of the drawing pipe has a contact length L ₁ with the ejected multifilament yarn Y that is L ₁ = 15 mm, and collides with the multifilament yarn Y. The inclination angle α formed by the yarn colliding surface 5a of the plate 5 is 47
It was °. Further, the distance from the lower end of the yarn collision surface 5a of the collision plate 5 to the net conveyor 6 having the air suction means 7, that is, the collection distance H was evaluated by H = 600 mm. The spread width was measured by measuring the spread width of the multifilament yarn in the direction orthogonal to the net advancing direction on a scale. Further, the charge amount was measured by setting an insulated net-made double basket having a known capacitance on the conveyor 6 and connecting it to a Faraday cage manufactured by Kasuga Electric Co., Ltd. Further, the variation of sheet C was obtained by a statistical method of n = 400 pieces by a weight method of 5 × 5 cm. CV = {σ / X} × 100 [%] where σ: standard deviation, X: average value

Further, the visual judgment of sheet unevenness, the judgment of life, and the judgment of integrity were carried out in the following manner. ◎: Excellent ○: Good △: Some problem ×: Very problematic

As shown in Table 1, the results of the fiber-opening evaluation are that the openability of nickel-white, which is a metal mainly composed of copper, zinc, and nickel next to lead, is overwhelmingly good, and the electrostatic charge of the sheet-like material is large. It turns out that these two are also expensive. In addition, at this time, when the contact member 5 is made of nickel silver, the weight loss of the sheet is 6.
It is 0, and it can be seen that it is significantly better than other members together with 5.6 of lead. The reason for this is not clear, but lead and nickel silver have more electrons emitted from the metal as a collision member than other members in collision and rubbing with the multifilament yarn, and as a result, the charge amount of the yarn is high. It is considered to be.

Next, as shown in Table 1, nickel silver is far superior to lead and the like in terms of prolonging the life and reducing the weight, which are necessary factors other than the high openability of the collision member. When compared with lead, which is often used as a collision member, nickel silver has a wear amount of 0.05 mm or less while lead is worn by 1 mm in thickness under the same conditions as in the openability evaluation. Life is 20 of lead
You can see that there are more than twice. As shown in Table 1, when the hardness of both metals is simply compared, lead is too soft to be measured, whereas the nickel-white Vickers hardness is 140
It is also clear from the fact that it has a hardness higher than that of soft iron. Further, regarding the weight reduction, the specific gravity of lead is 11.4, and that of nickel silver is about 8.8, which is 77% of that of lead. Furthermore, since nickel silver has a rigidity as high as that of soft iron, it is possible to omit the support material for the collision member, and further reduce the weight of the collision member unit.

[0034]

[Table 1]

[0035]

As described above, in the method and apparatus for producing a fiber web according to the present invention, since the multifilament yarn collides with or scrapes against the yarn collision surface in which nickel silver is used, Opening of multifilament yarn,
Spreading is performed efficiently. Further, by forming at least the yarn collision surface of the collision member with nickel silver, wear resistance is improved and the life is extended, and if the entire collision member is composed of nickel silver, weight reduction is promoted.

The yarn collision surface contains 97% or more of the total content of copper, zinc and nickel, and 54% or more of copper, 8.5% or more of nickel, 1.8% or less of lead and 0.1% of iron. Two
By forming nickel white with 5% or less and manganese 0.5% or less and the balance zinc, it is possible to extend the life and reduce the weight of the collision member while ensuring the corrosion resistance, mechanical properties and workability of the surface. At the same time, it is possible to enhance the effect of yarn opening and spreading.

[Brief description of drawings]

FIG. 1 is a schematic side view of a fiber web manufacturing apparatus according to an embodiment of the present invention.

2 is an enlarged side view of a yarn impacting member of the device of FIG.

[Explanation of symbols]

 1 Melt Spinneret 2 Heat Insulation Section 3 Yarn Suction Means 4 Stretching Pipe 4a Stretching Pipe Bottom 5 Collision Member 5a Yarn Collision Surface 6 Net Conveyor 7 Air Suction Means

Claims (4)

[Claims] 1. A continuous multifilament yarn spun from a spinneret is sucked by a yarn suction means, and then the continuous multifilament yarn is collided or rubbed against a collision member to open and spread the yarn. A method for producing a fibrous web, characterized in that, when the fibrous web in a sheet-like shape is opened, nickel white is used for at least the yarn impingement surface of the impingement member. 2. The nickel silver has a total content of copper, zinc and nickel of 97% or more, 54% or more of copper, 8.5% or more of nickel, 1.8% or less of lead and 0.25% of iron. The method for producing a fiber web according to claim 1, wherein manganese is 0.5% or less and the balance is zinc. 3. A spinneret for continuously spinning a multifilament yarn, a yarn suction means for sucking a yarn spun from the spinneret, and a yarn on which the sucked yarn collides or is scraped. A fiber web manufacturing apparatus having a fiber-spreading / spreading collision member, wherein at least a yarn collision surface of the collision member is formed of nickel silver. 4. The nickel silver has a total content of copper, zinc and nickel of 97% or more, 54% or more of copper, 8.5% or more of nickel, 1.8% or less of lead and 0.25% of iron. The method for producing a fiber web according to claim 3, wherein manganese is 0.5% or less and the balance is zinc.