JPH0532375A - Method for manufacturing robing package body - Google Patents

Abstract

PURPOSE:To provide a package body having the outermost layer of a robing package adhered to a heat contraction film. CONSTITUTION:A robing package 1 is put in a tubular heat contraction film 4. An ethylene-vinyl acetate copolymer film or tube 5 is inserted into a gap between the outer peripheral surface of the package 1 and the heat contraction film 4 by the use of a guide rod 6 and the heat contraction film 4 is heated and heat contracted, while an ethylene-vinyl acetate copolymer film or tube 5 is pressed against the outer peripheral surface of the package by the heat contraction film and the heat contraction film is adhered to the outer peripheral surface of the package through the film or tube 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a package in which a roving package formed by winding roving such as glass fiber is wound.

[0002]

2. Description of the Related Art Roving is used as a reinforcing material for fiber reinforced plastic (hereinafter referred to as FRP). This roving is usually supplied in the form of a package wound into a hollow cylinder.

Conventionally, a glass fiber roving package is manufactured by the following method. That is, each strand is drawn from a cake of a plurality of glass fiber strands attached to a creel, collected in a bundle with a slight tension applied to each strand, passed through a guide and a tension gate, and passed through a traverse guide eye of a winder, While traversing with the traverse guide eye, wind on the mandrel of the winder. Here, the tension is applied to each strand because it is necessary to tightly wind the roving from the package so that it does not collapse or loop when it reaches the outer layer when the roving is taken from the package. .. This is important not only for preventing the generation of scraps but also for continuously operating the molding process.
The winder has a rotating mandrel and a guide eye that reciprocates near the surface of the package that is being formed on the mandrel, and the mandrel reduces the rotation speed to keep the peripheral speed constant as the winding advances. It is connected to the drive adjustment mechanism. Further, since the roving is tightly wound, the package being formed on the mandrel is continuously pressed by the pressure roller. The usual dimensions of the package are 240 to 280 mm in diameter, 250 to 300 mm in height, and 13 to 20 kg in weight.

Another method of manufacturing a roving package is a method called direct winding roving, which is a method of bundling and directly winding a large number of glass fibers spun from a bushing into a fiber. This method is for space development and high performance F
It is used to manufacture rovings, which are essential for the manufacture of RP parts and which require uniform tension on the strands. The production specifications use a bushing of 1000 holes or more, and it is possible to produce a fiber diameter of 10 microns or more. The winder is a modification of the one used in normal glass fiber manufacturing equipment, incorporating a special control device at the end of the traverse movement, so that the end of the roving package can be squared, i.e. square. The end package can be formed. The collet rotation speed is programmed to provide a constant winding speed. Also in this manufacturing method, the size and weight of the manufacturing package are the same as those described above.

The roving packages manufactured in this manner are each packaged with a heat shrink film so that the rovings are not damaged during transportation or handling. When transporting, stack a plurality of them vertically, arrange a plurality of such items in parallel on a pallet, make a whole rectangular parallelepiped shape, cover the outer periphery with corrugated cardboard etc. to prevent scratches, and heat shrink the outer part Bonded with a film.

When the roving is used for manufacturing the FRP by the SMC method, the filament winding method, the spray-up method, etc., the roving 2 is pulled out from the inner side of the winding of the roving package 1 as shown in FIG. Used while supplying to (not shown). Further, since a plurality of roving packages are continuously used, the roving 2a at the winding end portion of the outermost layer of one roving package is pulled out from the opening in the upper center of the heat-shrinkable film enclosing the package, and then pulled out. It is tied in advance to the roving 2b at the beginning of winding 1.

However, when the roving is pulled out from the inside of the package and used, if the winding thickness of the roving approaches the end of winding and the winding thickness of the roving becomes thin, a slight external force pulling the roving is applied, and the outermost layer remaining in the package is removed. There is a problem that the roving sometimes collapses inward under its own weight, and a loop-shaped portion or a complicatedly entangled portion is formed, which is clogged with a guide of a feeding device or the like and the roving cannot be continuously pulled out.

[0008] As a specific adverse effect on the production of this accident, in the production of panels, spray-ups, SMCs, etc. in which production is temporarily stopped or a plurality of rovings are used at the same time, the glass content is decreased due to a decrease in the supply amount. It is possible to make non-uniform products. Particularly in a large package, the outer diameter and height of the package are large, and thus the occurrence of collapse of the roving remaining when pulling out the outermost layer of the package is high.

In order to solve such a problem, a sheet material having self-sustaining strength is adhered to the outer peripheral surface of the package with an adhesive or an adhesive, and the outermost roving is held by the sheet material. A structure that does not collapse inward is proposed in US Pat. No. 3,731,792.

[0010]

However, in such a conventional method, since an adhesive or an adhesive which is a highly viscous fluid is used to adhere the sheet material to the outer peripheral surface of the package, the workability is poor, Therefore, there is a problem that it is difficult to manufacture a roving package package. Furthermore, in a package in which a sheet material is adhered to the outer peripheral surface of the package with an adhesive or an adhesive, when the roving on the outer peripheral portion of the package is pulled out, the adhesive or the adhesive remains attached to the roving and is pulled out. Therefore, the roving quality of the outermost layer of the package was lower than that of other parts. That is, the dispersibility of the chopped strands obtained from the roving of the outermost layer and the impregnability into the matrix resin are deteriorated, which causes various problems in the quality of the molded product using the chopped strands as a reinforcing material.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to pull out the roving without causing the collapse from the innermost layer to the outermost layer of the roving package and without deteriorating the quality. It is an object to provide a manufacturing method capable of easily manufacturing a package package.

[0012]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have used a heat-shrinkable film as a sheet material for supporting the roving of the outermost layer of a package so as not to collapse, and When an ethylene-vinyl acetate copolymer film or tube is used to bond the heat-shrinkable film to the outer peripheral surface of the package, the workability is extremely good, and when the roving is pulled out in the obtained packaging, the roving The present invention has been accomplished by finding that the ethylene-vinyl acetate copolymer used for adhesion hardly adheres and does not cause quality deterioration.

That is, according to the present invention, a roving package formed by winding a roving into a cylindrical shape is placed in a cylindrical heat-shrinkable film, and the roving package is provided at one or more positions between the outer peripheral surface of the roving package and the heat-shrinkable film. , An ethylene-vinyl acetate copolymer film or tube is inserted using a guide rod so as to extend almost the entire length of the roving package, and then the heat-shrinkable film is heated and shrunk to be closely attached to the roving package. A gist is a method for producing a roving package package, which comprises adhering an ethylene-vinyl acetate copolymer film or a tube to a roving package and a heat-shrinkable film.

The present invention will be described in more detail below with reference to the drawings. 1 (a) is a schematic perspective view showing a state in which a roving package package is being manufactured by the method of the present invention, FIG. 1 (b) is a schematic perspective view of the manufactured roving package package, and FIG. 2 is the roving package. It is a schematic sectional drawing which shows the state which pulls out a roving from a package. The roving package package 3 produced by the method of the present invention comprises a roving package 1 wrapped with a heat-shrinkable film 4, and the heat-shrinkable film 4 on the outer peripheral surface of the roving package 1 by an ethylene-vinyl acetate copolymer film or a tube 5. It is glued. The roving package 1 used in the present invention is obtained by winding a roving 2 into a cylindrical shape. The roving is usually glass fiber, but other than this, carbon fiber or the like is optional.
In addition, the number of single fibers constituting the roving is 100
About 0 to 30,000 are preferable. The roving package can be formed by a known method, and may be obtained by winding together strands drawn from a cake, or by collecting spun fibers and directly winding them. Good. The weight of the roving package is not particularly limited, but is 50 kg to 3
It is particularly effective to apply the present invention to a large package such as 00 kg. The winding end 2a and the winding start end 2b of the roving forming the roving package 1 are connected to each other so that they can be easily pulled out.

The heat shrinkable film 4 used in the present invention is shown in FIG.
As shown in (a), the roving package 1 is formed into a cylindrical shape having a size capable of containing the roving package 1. Usually, the bottom of the bag is closed and only the top of the bag is opened so that the roving package can be put therein. However, a bag having both ends open may be used. This heat shrink film 4
Has a strength that can stand alone or together with the ethylene-vinyl acetate copolymer film or the tube 5 adhered thereto so as to support the outermost roving without breaking. The material of the heat-shrinkable film 4 is not particularly limited, and specific examples thereof include ordinary resin films that can be used for shrink packaging such as polyvinyl chloride and polypropylene, and have a thickness of 20 to
It is preferably about 300 microns.

In manufacturing the roving package package 3, first, as shown in FIG. 1 (a), the roving package 1 is put in a tubular heat-shrinkable film 4. When the roving package 1 is large, the roving package 1 may be put in the heat shrinkable film 4 by covering the roving package with the tubular heat shrinkable film 4. Next, the roving package 1
The ethylene-vinyl acetate copolymer film or tube 5 is inserted using the guide rod 6 so as to extend almost the entire length of the roving package between the outer peripheral surface of the heat-shrinkable film 4 and the heat-shrinkable film 4. This ethylene-vinyl acetate copolymer film or tube 5 is for softening or melting when heat-shrinking the heat-shrinkable film 4 to adhere to the roving on the outer peripheral surface of the package 1 and the heat-shrinkable film 4. It does not mean only a film or tube consisting of ethylene-vinyl acetate copolymer, but a film or tube having an ethylene-vinyl acetate copolymer on at least one of its surfaces (for example, a laminated film, a coated film, etc.) Including. The composition of the ethylene-vinyl acetate copolymer has a vinyl acetate content of 2 to
It is 20% by weight, preferably 5 to 15% by weight. When the vinyl acetate content is less than 2%, the adhesive strength to the roving is low and the roving collapse prevention effect is not obtained so much. On the other hand, when the content exceeds 20%, the adhesive strength to the roving becomes too large, and the roving is adhered to the drawn roving to deteriorate the roving quality. Therefore, the above composition range is preferable.

The guide rod 6 used for inserting the ethylene-vinyl acetate copolymer film or the tube 5 is an elongated and thin plate so that it can be easily inserted into the gap between the outer peripheral surface of the package 1 and the heat shrinkable film 4. It is a shape. To insert the ethylene-vinyl acetate copolymer film or the tube 5 between the outer peripheral surface of the roving package and the heat-shrinkable film, the ethylene-vinyl acetate copolymer film is wound around the guide rod 6, or the ethylene-vinyl acetate copolymer film is inserted. The guide rod 6 may be inserted into the polymer tube, the guide rod 6 to which the ethylene-vinyl acetate copolymer film or the tube 5 is attached may be inserted into a predetermined position, and then only the guide rod 6 may be pulled out. Thereby, the ethylene-vinyl acetate copolymer film or the tube 5 can be easily inserted into the narrow gap between the outer peripheral surface of the package and the heat shrink film. Since the inserted film or tube 5 is inserted into the narrow gap, it does not move, and therefore the operation of temporarily fixing it with an adhesive or an adhesive becomes unnecessary. When using an ethylene-vinyl acetate copolymer film, wind the film around the guide rod 6 and insert it between the outer peripheral surface of the package and the heat-shrinkable film, and then move the guide rod 6 in the circumferential direction. The wound film may be flattened by

The ethylene-vinyl acetate copolymer film or tube 5 is provided on at least one outer peripheral surface of the package 1.
It may be provided at two places, but it is preferably placed at two or three places at regular intervals in the circumferential direction. At that time, the film or tube 5 may be arranged in the axial direction of the package, or may be arranged so as to be inclined with respect to the axial direction.

After inserting the ethylene-vinyl acetate copolymer film or tube 5 between the outer peripheral surface of the package 1 and the heat-shrinkable film 4, the whole package is placed in a heat-setting furnace and heated to heat-shrink film 4 Heat shrink. As a result, as shown in FIG. 1B, the heat-shrinkable film 4 is brought into close contact with the outer surface of the package 1, and the temperature and pressure applied to the ethylene-vinyl acetate copolymer film or the tube 5 at that time (depending on the heat-shrinkable film). The surface of the film or tube 5 is softened or melted by the pressure, and is pressed against the roving on the outer peripheral surface of the package 1 and the heat-shrinkable film 4, and adheres to both. Here, the adhesion of the ethylene-vinyl acetate copolymer film or the tube 5 to the roving is not a chemical adhesion, but rather a physical phenomenon caused by the softened portion of the film or the tube 5 being pressed into the roving and biting into it. The bond is predominant, so that when the roving is peeled off from the ethylene-vinyl acetate copolymer film or tube during use, the ethylene-vinyl acetate copolymer rarely adheres to and remains on the roving. The heating temperature for heat shrinkage is 90 to 15
The temperature is 0 ° C., preferably 100 to 130 ° C., and the heating time is 10 minutes to 8 hours, preferably 1 to 5 hours. If it exceeds this range, the heat-shrinkable film may be broken, and if it falls below this range, the adhesiveness of the ethylene-vinyl acetate copolymer film or the tube is difficult to develop. Through the above steps, the roving package package 3 is manufactured.

In the roving package package 3 manufactured as described above, the outer peripheral surface of the package 1 is packaged with a heat shrink film 4, and the heat shrink film 4 is an ethylene-vinyl acetate copolymer film or tube. It is adhered to the roving on the outer periphery of the package 1 via 5. This roving package package 3 is also used as in the conventional case. That is, as shown in FIGS. 2A and 2B, the roving 2 is pulled out from the inside of the package 1 and consumed. When the remaining rovings 2 are reduced and only the outermost rovings 2 remain, the rovings 2 are adhered and held to the self-supporting heat-shrinkable film 4, so that they do not collapse. The remaining roving 2 is peeled off from the heat-shrinkable film 4 by the tension when it is pulled out and used. Here, since the roving 2 is adhered to the heat shrinkable film 4 by the ethylene-vinyl acetate copolymer film or the tube 5,
The ethylene-vinyl acetate copolymer is less likely to adhere to the drawn roving 2, and therefore the quality of the roving is not deteriorated. In addition, when there is a possibility that the heat shrinking film 4 may be lifted or moved due to the force when peeling the roving 2 from the heat shrinkable film 4, trouble may be caused by an appropriate means. It should be fixed on the floor. Thus, even the roving of the outermost layer of the package 1 can be pulled out without causing troubles such as collapse and sliding, and problems such as temporary suspension in the roving use process can be avoided. Even in this package package,
The roving can be continuously pulled out by previously tying the end of the roving to the roving tip of the next package. Further, at that time, when the roving of the first package is finished, the remaining heat-shrinkable film 4 may be removed.

[0021]

【Example】

Example 1 A roving package of glass fiber having an outer diameter of 550 mm, a height of 600 mm, and a weight of 200 kg was wrapped with a bag of a vinyl chloride resin heat-shrink film having a melting point of 170 ° C., and heat-shrinked with the package at two opposite positions on the outer circumference of the package. Between the film and the length 600mm, width 30mm, thickness 7
A 5 micron ethylene-vinyl acetate copolymer tube was inserted, and heat treatment was performed in a heat setting furnace in which hot air at 130 ° C was circulated. Thereby, the roving package package A was obtained.

Comparative Example 1 A saturated polyester adhesive (1.0 mol of phthalic anhydride, 1.0 mol of succinic anhydride, 2.3 mol) dissolved in acetone was added to vinyl chloride so that the solid content was 3 g / m ^2. Apply to the inner surface of the resin heat shrink film bag,
After air-drying, it was placed on the same roving package having the same outer diameter of 550 mm, height of 600 mm and weight of 200 kg as in Example 1. Next, this was heat-treated in a heat setting furnace in which hot air of 130 ° C. circulates. Thereby, a roving package package B was obtained.

With respect to each of the roving package packages A and B manufactured in Example 1 and Comparative Example 1, when the roving is pulled out from the inside of the roving package and the roving of the outermost layer is reached, whether or not the roving collapses occurs. When examined, it was found that no collapse occurred in any of the packages.

10 g each of the roving package corresponding to the roving package middle layer and the outermost layer of the roving pulled out from the roving package packages A and B were sampled and heated in an oven at about 625 ° C. for 1 hour. From the front and rear roving weights, the organic matter adhesion rate (%) during roving was determined using the following formula. The results were as follows. Sample Middle layer Outermost layer A 0.94 0.92 B 0.95 1.35 Note that the sizing agent with polyvinyl acetate as the main component had an attachment rate of about 0.9% during glass fiber spinning for this roving. As described above, it is added to the glass fiber.

As is clear from the above results, in the case of the package B according to Comparative Example 1, the organic substance deposition rate of the sample collected from the outermost layer is considerably higher than that of the sample collected from the intermediate layer. It is considered that this is because the adhesive used for bonding the outer peripheral surface of the roving package and the heat shrinkable film adhered to the roving and remained. On the other hand, in the package A according to Example 1, there is no difference in the organic matter adhesion rate between the sample collected from the intermediate layer and the sample collected in the outermost layer, which means that in this package, any component is newly added to the outermost layer roving. It shows that it does not adhere to.

Next, each roving pulled out from the above-mentioned roving package packages A and B is cut into a length of 25 mm to form chopped strands, and the dispersibility of the chopped strands, that is, the rovings are dispersed into the strands forming the chopped strands. It was observed whether or not. As a result, in the case of the package B according to Comparative Example 1, the dispersibility was good in the portion corresponding to the roving package intermediate layer,
In the portion corresponding to the outermost layer, strands which are bonded to each other and are not dispersed are considerably recognized, and it cannot be said that the dispersibility is good. On the other hand, in the package A of Example 1, there was no difference in dispersibility between the part corresponding to the intermediate layer and the part corresponding to the outermost layer, and all showed good dispersibility.

Further, the impregnating property of the resin into the chopped strands produced as described above was examined as follows. 5
g chopped strand, length 100mm, width 100
mm to form a chopped strand mat
An unsaturated polyester resin varnish (65% by weight of unsaturated polyester resin and 35% by weight of styrene) was poured into this. The varnish gradually penetrates into the mat and eventually becomes transparent. The time required for clearing is called the impregnation time. The impregnation time is an index showing the affinity between the glass fiber and the unsaturated polyester resin varnish. The results are shown below: Middle layer Outermost layer A 15 minutes 15 minutes B 15 minutes 18 minutes

As is clear from the above results, Comparative Example 1
In the case of the package B, the impregnation time was 15 minutes in the portion corresponding to the roving package intermediate layer, while 18 minutes was required in the portion corresponding to the outermost layer. It can be seen that the impregnating property is reduced in the portion corresponding to the outermost layer. In contrast,
In the case of the package A of Example 1, there was no difference in impregnation time between the portion corresponding to the intermediate layer and the portion corresponding to the outermost layer.

[0029]

As described above, in the method of manufacturing a roving package package of the present invention, after the package is put in a cylindrical heat shrink film, ethylene-vinyl acetate is placed between the outer peripheral surface of the package and the heat shrink film. Insert the copolymer film or tube using a guide rod, and then heat-shrink the heat-shrink film to cause heat-shrink, and at the same time bond the ethylene-vinyl acetate copolymer film or tube to the heat-shrink film and the outer peripheral surface of the package. It is possible to make the production of the package extremely easy. Further, the obtained roving package package, the outermost roving is adhered to the heat-shrinkable film via the ethylene-vinyl acetate copolymer film or tube, so that the roving is pulled out from the inside of the package and the outermost layer Even if only roving remains,
The outermost roving is held by the heat-shrinkable film, it does not collapse, and the roving can be pulled out satisfactorily to the end without causing entanglement etc. of the roving, and it is adhered to the pulled out roving. Since organic substances such as agents do not adhere and remain, it has an effect that the quality does not deteriorate.

[Brief description of drawings]

FIG. 1 (a) is a schematic perspective view showing a state in which a roving package package is being manufactured by the method of the present invention,
(B) is a schematic perspective view of the manufactured roving package package.

FIG. 2A is a schematic cross-sectional view showing a state in which roving has started to be pulled out from the roving package package, and FIG. 2B is a schematic cross-sectional view showing a state in which the outermost roving is pulled out from the roving package package.

FIG. 3 is a schematic perspective view showing a state where the roving is pulled out from the roving package.

[Explanation of symbols]

1 Roving Package 2 Roving 3 Roving Package Package 4 Heat Shrink Film 5 Ethylene-Vinyl Acetate Copolymer Film or Tube 6 Guide Rod

Claims (1)

Claim: What is claimed is: 1. A roving package obtained by winding roving into a cylindrical shape is placed in a cylindrical heat-shrinkable film, and the roving package is placed at one or more positions between the outer circumferential surface of the roving package and the heat-shrinkable film. , An ethylene-vinyl acetate copolymer film or tube is inserted using a guide rod so as to extend almost the entire length of the roving package, and then the heat-shrinkable film is heated and shrunk to be closely attached to the roving package. A method for producing a roving package package, which comprises bonding an ethylene-vinyl acetate copolymer film or a tube to a roving package and a heat-shrinkable film.