JP3269542B2 - Method and apparatus for producing fiber web - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a fiber web by spun or spread a continuous multifilament yarn by colliding or rubbing a continuous multifilament yarn with a collision member in the production of spunbond or the like. And a method and apparatus for performing the method.

[0002]

2. Description of the Related Art A fiber web manufacturing apparatus for sucking a multifilament yarn being spun from a spinneret with a suction device, and opening and expanding the fiber directly to form a sheet-like web directly is disclosed in Japanese Patent Application Laid-Open No. 60-162852. As is typified by Japanese Patent Application Laid-Open No. H10-209, it is currently generally used as a spun bond manufacturing apparatus. An important issue when improving productivity with such a manufacturing apparatus is stabilization of production conditions. Among them, stabilization of fiber opening conditions is one of the most important. For this reason, various techniques have been proposed for the continuous multifilament opening method. As a generally well-known method, there is a method of improving the spreadability by increasing the supply amount of a compressible fluid to the yarn suction device,
No. -17212, Japanese Patent Publication No. 59-20013,
As represented by JP-A-60-119258,
How to use an impact member where the yarn is easily electrostatically charged,
A method of using a piezoelectric element as a collision member as in JP-B-63-42015 is known.

[0003] However, although the method of increasing the supply amount of the compressible fluid is effective in improving the spreadability, it increases the production cost and also disturbs the air flow of the entire fiber web manufacturing apparatus. However, there is a problem that the product quality often deteriorates. In a method using a collision member in which a yarn is liable to be electrostatically charged, as represented by JP-B-59-17212 and JP-B-59-20013, a collision member having a good opening property is used. There is a problem in that a collision member having a good property, that is, a short life and a long life is not sufficiently open. Also, JP-B 63-42
In the method in which the collision member on the downstream side of the yarn suction device is constituted by a piezoelectric element as disclosed in Japanese Patent No. 015, although the spreadability is improved, the life of the collision plate is reduced by the piezoelectric element electrode (for example, silver or aluminum vapor-deposited). ) Depends on the wear resistance
There was a drawback that it became extremely short.

Among the methods for opening a fibrous material by electrostatic charging, use is made of a collision member whose yarn is easily electrostatically charged as represented by the above-mentioned JP-B-59-17212 and JP-B-59-20013. This method is a convenient method that has a good yarn opening property in spite of the fact that the production equipment is inexpensive, and is a method that is often used. However, the method of opening a yarn by using electrostatic charging due to collision or rubbing is the largest factor that determines the period in which the material of the member for collision or rubbing can maintain the opening property of the yarn and its conditions, that is, the life. Nevertheless, high fiber opening, long life,
No material has yet been found that satisfies both weight reduction and ease of processing.

In the method of opening the yarn by electrostatic charging due to collision or rubbing, Japanese Patent Publication No. 59-1721 discloses a method.
As disclosed in Japanese Patent Publication No. 2 (1999), use of a metal mainly composed of zinc, zinc oxide, or copper has been proposed as an opening member. Japanese Patent Publication No. 59-20013 proposes a composition containing lead as a main component, and Japanese Patent Publication No. 60-119258 proposes a composition containing bismuth as a main component. However, zinc and copper disclosed in JP-B-59-17212 have insufficient spreadability.
The lead disclosed in Japanese Patent Application Publication No. 200113 has a problem that a special device is required in order to facilitate replacement, since the spreadability is good, but the life is short and the spreader member is heavy. Also,
Bismuth disclosed in Japanese Patent Publication No. 60-119258 has a drawback that the workability is poor and the spread member becomes very expensive. Under such circumstances, the development of a light-weight, high-spreading fiber-opening member having a long service life and easy processing has been desired.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a fibrous web by opening a yarn in order to open the yarn by utilizing electrostatic charging due to collision or rubbing. An object of the present invention is to provide a collision member that satisfies all of the required conditions of high fiber opening, long life, light weight, and workability.

[0007]

According to the present invention, there is provided a method for producing a fibrous web, comprising the steps of: suctioning a continuous multifilament yarn spun from a spinneret by a yarn suction means; When the yarn is opened or expanded by colliding or rubbing against a collision member to produce a sheet-like fiber web, at least the yarn collision surface of the collision member is made of nickel white. Consist of methods.

That is, the present inventors have conducted intensive studies,
In the method of opening the fiber by colliding or rubbing the continuous multifilament yarn with the member, it was found that nickel white, that is, an alloy mainly composed of copper, zinc, and nickel was excellent in the member. Was.

[0009] The addition of zinc to nickel silver has the effect of improving the castability, but if it is too much, the corrosion resistance and strength are reduced. 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, copper of 54% or more, and nickel of 8.5%.
As described above, it is preferable that lead is 1.8% or less, iron is 0.25% or less, manganese is 0.5% or less, and the balance is zinc white.

[0010] The apparatus for producing a fiber web 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; In a fiber web manufacturing apparatus having a fiber opening and a collision member for expanding and spreading the colliding or rubbed yarns, at least the yarn collision surface of the collision member is formed of nickel white.

The nickel white forming the yarn collision surface is as follows:
The total content of copper, zinc and nickel is 97% or more, and
Desirably, copper is at least 54%, nickel is at least 8.5%, lead is at most 1.8%, iron is at most 0.25%, manganese is at most 0.5%, and the balance is zinc.

[0012]

In the method for producing a fiber web, the multifilament yarn collides with or rubs against the yarn collision surface of the collision member formed of nickel silver, and is effectively opened and expanded. This is because, when a multifilament yarn collides or rubs, nickel silver emits electrons more easily than other members,
It is considered that this is because the charge amount of the multifilament yarn increases.

In addition, nickel silver is used in which the total content of copper, zinc and nickel is 97% or more, and copper is 54% or more, nickel 8.5% or more, lead 1.8% or less, iron 0.25% or less. , 0.5% or less of manganese, with the balance being made of zinc, so that the appropriate corrosion resistance, mechanical properties, and workability of the collision member are ensured, and the spreadability and life are more effective. To be improved.

In the above-described apparatus for producing a fibrous web, the multifilament yarn collides with or rubs against the yarn collision surface of a collision member formed of nickel silver. Nickel white emits electrons more easily than other members when the multifilament yarn collides or rubs, and as a result, the charge amount of the multifilament yarn is increased. Therefore, it is considered that the multifilament yarn is effectively opened and spread.

The nickel silver composition is such that the total content of copper, zinc and nickel is 97% or more, copper is 54% or more, nickel 8.5% or more, lead 1.8% or less, iron 0.25% Less than,
By making the manganese 0.5% or less and the balance being made of zinc, it is possible to obtain an impact member having excellent opening resistance and life as well as good corrosion resistance, mechanical properties and workability. it can.

[0016]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show an apparatus for producing a fiber web according to one embodiment of the present invention. In the figure,
Reference numeral 1 denotes a melt spinneret having a large number of discharge holes (in the present embodiment, the number of the die holes is 60). From the spinneret 1, a multifilament yarn Y made of, for example, polyethylene terephthalate is melt-spun. A heating and heat retaining section 2 is provided around the spinneret 1 to improve the spinnability by reducing the melt viscosity of the multifilament yarn Y.

Reference numeral 3 denotes a yarn suction means, which is a high-pressure high-speed fluid (in this embodiment, a supply pressure of 5 kgf /
The multifilament yarn Y melt-spun from the spinneret 1 is sucked at a high speed by an ejector effect of using air of ² cm ² ). A yarn cooling device (not shown) is provided between the heating / heating unit 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 suction means 3, and the multifilament yarn Y is passed through the drawing pipe 4 by air which is a high-speed fluid injected from the yarn suction means 3. It is designed to perform a high degree of stretching by accompanying traction and its traction force. The multifilament yarn Y sucked by 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 provided in the filament yarn traveling direction.
a collide. Due to this collision, the multifilament yarn Y is electrostatically charged and changes direction. When the direction is changed, the multifilament yarn Y is spread and expanded by the action of high-speed fluid and static electricity. In this example, the traveling speed of the multifilament yarn was set to 5000 m / min.

A straightening mechanism (not shown) comprising a number of nozzles is provided inside the yarn suction means 3. Therefore, the high-speed pressure fluid supplied to the yarn suction means 3 has a uniform distribution without density unevenness inside the yarn suction means 3. Therefore, the high-speed fluid ejected from the lower end 4a of the drawing pipe becomes a substantially straight direct jet, and does not swirl. Therefore, no false twist is given to the multifilament yarn Y, and no fusion occurs in the multifilament yarn Y on the upstream side.

The colliding member 5 is made of nickel-white.
Nickel silver contains 97% or more of copper, zinc and nickel in total, and 54% or more of copper and 8.
5% or more, lead 1.8% or less, iron 0.25% or less, manganese 0.5% or less, and the balance is formed of zinc.

The collision members 5 are provided corresponding to the respective spinning heads. A plurality of collision members 5 are arranged so as to cross the net conveyor 6 in a row, and each of them performs a swinging motion right and left. It has become. The plurality of colliding members 5 are swung right and left (in the direction of the arrow in the drawing) by a driving device (not shown) to spread the multifilament yarn Y, which changes direction by the collision, more widely. A sheet-like fiber web W having a uniform thickness is formed on a net conveyor 6 having

In the apparatus of the embodiment described above, 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 drawn by the yarn suction means 3 and sent into the drawing pipe 4. The multifilament yarn Y drawn in the drawing pipe 4 is ejected from the drawing pipe lower end 4a together with air. The multifilament yarn Y spouted from the lower end 4a of the drawing pipe is
a.

Since the yarn collision surface 5a is formed of a nickel-white having excellent spreadability and spreadability, the spread and spread of the multifilament Y colliding with this surface is effectively performed. This is considered to be because nickel silver emits a large amount of electrons due to collision with or abrasion with the multifilament Y, and the emitted electrons charge the multifilament Y.

Further, since the surface hardness of nickel silver is extremely high as compared with metal (for example, lead) which has been conventionally used as a collision member, it is hard to be worn or damaged. Therefore, the life of the collision member 5 is prolonged.

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

In the present embodiment, the composition of nickel silver forming the collision member 5 contains 97% or more of total 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 formed of zinc. The addition of zinc has the effect of improving castability,
If it is too large, the corrosion resistance decreases. On the other hand, the addition of nickel has the effect of improving the corrosion resistance and mechanical properties, but if too much, the melting and 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 is improved.
The mechanical properties and workability are well-balanced and well maintained.

In addition, since the collision member 5 is formed of nickel-white, the above-described corrosion resistance, mechanical properties, and workability are ensured, and the multifilament Y is effectively and effectively opened and spread. Is realized, and the life of the collision member 5 is prolonged.

In the above-described embodiment, the entire collision member 5 is made of nickel white, but the same operation and effect can be obtained by forming only the yarn collision surface 5a of nickel white.

Example 1, 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 open a sheet-like fiber web. An explanation will be given of the evaluation results of the spreadability and life, which are one of the most important factors in improving the productivity in manufacturing. A multifilament yarn being spun from the spinneret shown in FIG. 1 is suctioned by the yarn suction means 3, and is opened and expanded to directly form a sheet-like web.
The spreadability and the life were evaluated. As shown in FIG. 2, the continuous multifilament yarn Y traveling downward from above is caused to collide with the yarn collision surface 5a of the collision member 5 which is positioned obliquely so as to block the yarn, and the collection net 6 is formed. It was collected on the top to form a sheet W. At this time, the width of the sheet-like material in the direction orthogonal to the direction of travel of the collecting net, that is, the spread width, the amount of electrostatic charge of the multifilament yarn Y, and the like are 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 fineness of the single yarn was 2 d, and the yarn traveling speed was 5000 m / min.

The shape and mounting conditions of the collision plate 5 used this time are as follows.
In mm, a length L shown in FIG. 2 is L = 20 mm, the contact length L ₁ of the multifilament yarn Y exiting the stretching pipe lower end 4a is L ₁ = 15 mm, collide with multifilament yarns Y The inclination angle α formed by the yarn collision surface 5a of the plate 5 is 47
°. Further, the distance from the lower end of the thread 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 at H = 600 mm. In the measurement of the spread width, the spread width of the multifilament yarn in a direction orthogonal to the net advancing direction was measured on a scale. The charge amount was measured by placing an insulated double basket made of net with known capacitance on the conveyor 6 and connecting it to a Faraday cage manufactured by Kasuga Electric Co., Ltd. In addition, the variation rate CV was obtained by statistical calculation of n = 400 pieces by a 5 × 5 cm weight method with respect to the sheet spots. CV = {σ / X} × 100 [%] where σ: standard deviation, X: average value

Further, the sheet spot visual judgment, the life judgment and the comprehensive judgment were performed in the following manner. ◎: Excellent ○: Good △: Somewhat problematic ×: Very problematic

As shown in Table 1, the evaluation results of spread-opening are as follows. As shown in Table 1, the spreadability of nickel-white, which is a metal mainly composed of copper, zinc and nickel, is overwhelmingly excellent, and the electrostatic charge amount of the sheet-like material is excellent. It can be seen that these two are similarly high. In addition, at this time, the spot weight of the sheet when the white member is used for the collision member 5 is 6.
0, indicating that it is significantly better than the other members together with 5.6 of lead. Although the reason for this is not clear, lead and nickel silver emit more electrons from the metal that is the colliding member in collision and rubbing with the multifilament yarn than in other members, 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 or the like in terms of longer life and lighter weight, which are necessary factors other than the high opening property of the collision member. When compared with lead, which is frequently used as a collision member, under the same conditions as in the evaluation of the spreadability, the amount of wear of nickel white while the lead is worn by 1 mm is 0.05 mm or less. Life is 20 of lead
It turns out that there is more than double. As shown in Table 1, when the hardness of both metals is simply compared, lead is too soft to measure, whereas the Vickers hardness of nickel silver is 140.
It is also evident from having a hardness higher than that of soft iron. Further, regarding the weight reduction, nickel white is about 8.8, which is 77% of the lead, with respect to the specific gravity of lead of 11.4, and the same size can reduce the weight by about 30%. Further, since nickel silver has high rigidity similar to that of soft iron, it is possible to omit a support member for a collision member and the like, and to further promote weight reduction as a collision member unit.

[0034]

[Table 1]

[0035]

As described above, according to the method and apparatus for producing a fibrous web according to the present invention, since the multifilament yarn collides or rubs against the yarn collision surface using nickel silver, Opening of multifilament yarn,
The expansion is performed efficiently. Further, by forming at least the yarn collision surface of the collision member with nickel white, wear resistance is improved and the life is extended, and if the entire collision member is made of nickel white, weight reduction is promoted.

The yarn collision surface contains 97% or more of copper, zinc and nickel in total, and 54% or more of copper, 8.5% or more of nickel, 1.8% or less of lead, and 0.1% of iron. 2
5% or less, manganese 0.5% or less, the balance is made of nickel silver, so that the corrosion resistance, mechanical properties and workability of the surface can be ensured, and the life and weight of the impact member can be extended. At the same time as it can be measured, the effect of opening and spreading the yarn can be further enhanced.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view of a yarn collision member of the apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melt spinneret 2 Heat insulation part 3 Thread suction means 4 Drawing pipe 4a Draw pipe lower end 5 Collision member 5a Thread collision surface 6 Net conveyor 7 Air suction means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D04H 1/00-18/00 D02J 1/00-13/00

Claims (4)

(57) [Claims] 1. A continuous multifilament yarn spun from a spinneret is sucked by a yarn suction means, and then the continuous multifilament yarn is caused to collide or rub against an impact member to spread and spread the yarn. A method for producing a fibrous web, comprising using a nickel white for at least the yarn collision surface of the collision member when producing the sheet-like fiber web by opening. 2. The nickel silver alloy has a total content of copper, zinc and nickel of 97% or more, copper of 54% or more, nickel of 8.5% or more, lead of 1.8% or less, and iron of 0.25%. 2. The method for producing a fiber web according to claim 1, wherein the content of 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 rubbed. An apparatus for producing a fiber web, comprising: a fiber web production apparatus having a fiber opening and expanding collision member, wherein at least a yarn collision surface of the collision member is made of nickel silver. 4. The nickel silver alloy has a total content of copper, zinc and nickel of 97% or more, copper of 54% or more, nickel 8.5% or more, lead 1.8% or less, iron 0.25%. The apparatus for producing a fiber web according to claim 3, wherein the content of manganese is 0.5% or less and the balance is zinc.