JPH07228422A - Package for roving - Google Patents

Abstract

PURPOSE:To increase the size of rovings by separately arranging multiple- rovings each made of a specific number of fibers nearly in parallel on the same winding layer in a package wound with the rovings of doubled yarns into a continued winding layer. CONSTITUTION:When a glass fiber chopped strand is manufactured, it is the essential requirement that the size of a roving is large, i.e., the number of fibers of the roving is large. The roving is made of 2500-25000 fibers, preferably 4000-15000 fibers, particularly preferably 5000-10000 fibers. A package 15 of rovings is separately arranged with two rovings 21, 22 nearly in parallel in the same winding layer. The first layer 2 is provided circumscribingly with a space section 1, the second layer 3 is provided on the outside, the third layer 4 is provided on the outside, and the fourth layer 5 is provided on the outside. Two rovings 21, 22 are separately wound in three turns nearly in parallel in the third layer 4, and they are connected to the fourth layer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roving package in which yarns are combined, and more particularly to a roving package in which a plurality of glass fiber strands are aligned and combined.

[0002]

2. Description of the Related Art A conventional technique will be described by taking a package of glass fiber roving as an example. The package of the glass fiber roving by the indirect method is, for example, first, applying 400 to 2000 glass fiber filaments drawn from a bushing by a winding machine while applying a sizing agent to the filaments by a coating device, and dividing the filaments. It is divided into a plurality of strands and bundled with-, and wound on a take-up tube fitted to a high-speed rotating body while traversing with a traverse device, and then dried and dried in a drying process. make. The obtained multiple cases
By gathering a plurality of strands from the key in parallel to the fiber length direction, aligning them in a predetermined number and winding them into a weight of about 15 to 300 kg per package without twisting, and penetrating between both ends of the central part. Put the package with the space inside into a heat-shrinkable film such as polyvinyl chloride and heat-treat it.
As a shrink-wrapped product of a package, a package of glass fiber roving is obtained.

An indirect roving package is manufactured by winding a cake once in a spinning step and then combining a plurality of strands drawn from the obtained cakes. Therefore, since it is not restricted by the number of orifices of the bushing, which is a production unit in the spinning process, the roving has a relatively larger thickness than that of the package of the serially wound lobing described later. 1500 industrially today
The roving composed of about 0 filaments is the thickest.

On the other hand, since a plurality of strands drawn out from a plurality of cakes are manufactured by combining yarns, loops are likely to occur in the strands at the time of combining yarns, but since they are combined yarns, the dispersibility of roving is Is a series-wound roving package described later.
Better than J. The roving package obtained by the indirect method is used as a reinforcing material by cutting the roving because the roving is relatively thick, loops are easily generated, and dispersibility is good. It is mainly used.

On the other hand, in the package of direct winding roving, 400-2000 glass fiber filaments drawn from a bushing are pulled by a winder and a sizing agent is applied to the filaments by a coating device. It is obtained by aligning and winding as it is.

As a method for obtaining a package of series winding lobing, for example, a proposal has been made in Japanese Patent Laid-Open No. 62-226837, but it is restricted by the number of orifices of a bushing which is a production unit of a spinning process. The thickness of the roving is small, and the roving composed of about 3000 filaments is industrially the thickest today. Various proposals have been made for bushings having more than 3000 orifices, but it is difficult to uniformly cool a large amount of molten glass flow extruded from the orifices. Therefore, at present, there are about 4000 orifices per bushing. Is the largest.

[0007] The package of the straight winding roving is formed by applying a sizing agent to the filaments, aligning the filaments as they are, and packaging the filaments as a single roving to form a package. The individual filaments are integrated by the sizing agent, and the fibril segmentation of the roving is worse than that of the roving package obtained by the indirect method.

On the other hand, a roving package is obtained in the spinning step, and since there is no stranding of the strands, a fiber loop is unlikely to occur during the roving. Due to the characteristics such as the thickness of the roving being small, the number of loops of the fiber being small, and the dispersibility of the fiber being poor, the continuous winding roving package uses continuous fibers as a reinforcing material. It is mainly used for applications, typically the filament winding method.

In applications where continuous fibers are used as a reinforcing material, the dispersibility of the fibers in the composite material is not strongly required. On the other hand, in applications where the fibers are cut and used as a reinforcing material, the dispersibility of the fibers in the composite material is required to such an extent that the fibers are uniformly subdivided into strands.

As an example of the use of cutting the fibers as a reinforcing material, when manufacturing glass fiber chopped strands, one roving package is used from each of several tens of roving packages. By pulling out from the roving end located in the space penetrating between both ends of the central part, several tens of rovings are simultaneously cut into arbitrary fiber lengths. In this cutting step, recently, in order to improve the productivity, it has been desired to increase the throughput of roving per unit time.

[0011]

As means for increasing the throughput, a method of increasing the number of roving packages and simultaneously drawing out the number of so-called rovings, a cutting speed improvement and a package are constructed. A method of thickening the roving can be considered.

The increase in the number of packages leads to an increase in the floor area for installing the packages. In order to eliminate this increase in floor area, there is also a method of elongating the roving package, that is, a method of increasing the height of the package and reducing the diameter, but a long package does not work. There is a limit because one or a few layers of the roving inscribed in the through space in the central portion of the package may collapse during the temporary interruption of the package to cause the roving to be entangled.

The increase in the processing speed causes damage to the strands forming the roving (fluff) due to an increase in the frictional resistance between the roving and the guide, and an increase in the cutting device failure such as damage to the blade of the cutting device. When the cut chopped strands are dispersed in a mat, there are problems such as an increase in non-uniform dispersion.

Therefore, there is a demand for a method of thickening the roving forming the package. However, when the roving is thickened, there is a problem that the dispersibility of the roving is deteriorated. Specifically, when the chopped strands obtained by cutting the roving are dispersed and processed into a mat, and used for the production of sheet mold compound (SMC), before the cutting, SM after the bundle of thickness is cut
In C, it is necessary to subdivide into strands composed of 100-300 glass fibers,
If the subdivision is insufficient, a portion of the thickness of the strand set in the SMC and a portion subdivided into strands occur. When the thickness is different, the degree of resin impregnation in those portions is different, and the impregnation of the resin in a portion having a large thickness is poor. The unevenness of the resin impregnation causes unevenness of mechanical properties such as strength of SMC, leading to deterioration of product quality.

SM of this roving-thick bundle
The subdivision in C is affected by various factors,
Above all, it is strongly influenced by the thickness of the roving forming the roving package. The larger the lobing thickness, the worse the subdivision.

The roving package is a package.
The roving is pulled out from the roving end in the space that penetrates between the two ends of the central part of the gage, but when the thickness of the roving becomes large, the work is temporarily interrupted, that is, the roving is pulled out. There is a problem that one or a few layers of the roving inscribed in the through space at the center of the package collapses when it stops, resulting in entanglement of the roving. This collapse phenomenon increases as the thickness of the roving increases.

When the thickness of the roving becomes large, the deterioration of the above-mentioned subdivision and the increase of the collapse phenomenon cause the thickness of the roving to be made large in order to improve the productivity in the cutting process and the like. Hindering

According to the present invention, a roving package in which the thickness of the roving forming the roving package is increased without impairing the subdivision and without increasing the collapse phenomenon.
The purpose is to provide the.

[0019]

SUMMARY OF THE INVENTION An object of the present invention is to package a roving in which yarns are combined into a continuous winding layer.
This can be achieved by a roving package in which a plurality of the rovings composed of 2500 to 25,000 fibers are separated and arranged substantially in parallel in the same wound layer.

[0020]

EXAMPLES The material of the roving constituting the package of the roving of the present invention is particularly effective for glass fiber, but it is optional, for example, acrylic / pitch-based carbon fiber, rayon. Organic fibers such as flame-resistant fibers, polyester fibers, aromatic polyester fibers, and polyamide fibers,
It is effective for ceramic fibers such as boron fibers, silicon carbide fibers, alumina fibers and silica fibers, and inorganic fibers such as asbestos fibers and high-purity quartz fibers.

Regarding the cross-sectional shape of the material of the roving, for example, a non-circular cross-section as described in Japanese Patent Application No. 5-253588, that is, the cross-section of the material has the longest diameter / shortest diameter. The ratio is 1.2 or more, for example, elliptical,
Eyebrows, rectangles and the like are preferable. Although it is a conclusion obtained as a result of many experiments, the material of the above-mentioned cross-sectional shape is
This has the effect of reducing the collapse phenomenon described below.

One of the main objects of the present invention is, for example, to improve the productivity in the production of glass fiber chopped strands. The roving has a large thickness, that is, the number of rovings is large. It is an essential requirement that the lobing of the present invention should be composed of a plurality of 2500-25000, and preferably 4000-15.
It is a plural number of 000, and particularly preferably 5000.
A plurality of -10000 pieces. When the number is small, the effect of improving the productivity is small, and when the number is too large, the deterioration of subdivision and the collapse phenomenon are likely to occur.

Expressing the thickness in count, the preferable thickness of the roving is composed of a plurality of 1350-5070 texes, and particularly preferably a plurality of 1690-3380 texes.

In the roving package of the present invention, a plurality of rovings are arranged in parallel in the same winding layer. In FIG. 1, the first layer 2 is inscribed in the space portion 1 penetrating between both ends of the central portion, the second layer 3 is outside thereof, the second layer 3 is outside thereof, and the third layer 4 and the outside of the third layer 4 are outside thereof. The fourth layer 5 is schematically shown in FIG. 1, and the first layer has a roving end.
In FIG. 2, the side surfaces of the third layer 4 and the fourth layer 5 are schematically shown. The second layer 4 in FIG. 2 has two rovings.
Within the third layer, they are separated by three turns and connected to the fourth layer 5 almost in parallel. In FIG. 2, two rovings are arranged on the same winding layer and separated substantially in parallel, but two or more rovings can be suitably implemented.

[0025]

In the roving package of the present invention, a plurality of rovings are arranged in parallel in the same winding layer. When a chopped strand is manufactured using this package, the roll drawn from this package is used.
The thickness of the bing is the thickness of the combined yarn of the plurality of rovings.
For example, when two rovings are arranged in the same wound layer, a roving having the thickness of two compound yarns is drawn out.

However, when the drawn lobing is cut, the two rovings are arranged separately in the same winding layer, and therefore the thickness of the two composite yarns acts. Instead, each acts as one roving. Thus, when used in the manufacture of SMCs, each acts as a single roving within the SMC, preventing the degradation of subdivision that occurs when the thickness of the roving becomes large.

Further, when the thickness of the roving becomes large, the layers collapse, that is, in FIG. 1, the first to second layers which are inscribed in the space portion 1 penetrating between both ends of the central portion. There is a problem that collapse easily occurs. More specifically, when manufacturing glass fiber chopped strands, a space 1 is formed by passing one roving from each of several tens of roving packages between the two ends of the center of the package. It is supplied to the cutting device by pulling out from the roving end of the first layer inscribed in. When this supply is interrupted from the end of work in the evening to the start of work in the next morning, the above-mentioned collapse phenomenon frequently occurs.

This collapse phenomenon has many factors, for example, the shape of the package such as the height of the package, the type of roving such as the thickness of the roving forming the package, and the like. It is affected by various kinds of strands such as a sizing agent for the strands constituting the bing, winding conditions such as winding tension, speed and contact pressure, but there is no established theory.

Set the height of the package to 600 mm and
Change the thickness of the bing and fix other conditions to the package.
Di formed. When the thickness of the roving was small and 3000 tex, the collapse phenomenon did not occur. However,
When the thickness of the bing gradually increased to 4000 tex, the collapse phenomenon began to occur, and when it reached 4800 tex, the collapse phenomenon frequently occurred.

Next, with the height of the package fixed to 600 mm and the thickness of the roving fixed to 4800 tex, the winding tension and contact pressure (the pressure at which the roving contacts the package being wound) are fixed. ) Was changed to form a package. The collapse phenomenon decreased with increasing winding tension and contact pressure. However,
The following problems occurred. That is, the dispersibility of chopped strands obtained from the roving of the package obtained by increasing the winding tension and the contact pressure, that is, the subdivision, deteriorated.

In a number of experiments, a roving package made of glass fiber having a flat cross section was obtained with less collapse phenomenon. The roving of glass fiber having a flat cross section was slightly flatter than that of ordinary glass fiber.

When the relationship between the constitution of the present invention and the collapse phenomenon is estimated from these results, the two rovings are arranged separately in the same winding layer, and therefore, the two rovings are combined. Low
The bing acts as if it were one flat roving, and it is considered that the collapse phenomenon has decreased.

[Experimental Example] A filament having a single fiber diameter of 13 µ was drawn out from an 800-hole bushing, applied with a sizing agent, divided into 3 strands by a dividing shoe, and wound into a cake to obtain a wet cake. -I got it. The obtained wet cake was dried at a temperature of 130 ° C. for 10 hours to obtain a dry cake.
The total thickness of the three strands of the cake obtained is 27
It was 0 tex.

Twenty-four dry cakes 7 from which the winding tube had been removed were attached to the cake rack 8 shown in FIG. Twelve dry cakes out of the 24 dry cakes 7 attached to the shelf 8 were pulled out from the strand layer inscribed in the space where the winding tube of the dry cake 7 was removed. The 12 strands pulled out from key 7 were combined to form roving 21. The thickness of this roving 21 was 3240 tex.

A roving 22 was obtained in the same manner from the remaining 12 dry cakes 7 out of the 24 dry cakes 7 mounted on the cake rack 8. The thickness of this roving 22 was also 3240 tex, which was the same as that of the roving 21.

Obtained roving 21 and roving 2
2 applies the tensions necessary to form a roving package by passing through the tension applying device 9 and the tension applying device 9 ', respectively, and the upper guide guides 10 and 11 and the upper guide guides 10' and 11 respectively. ′ In the traverse guide 13 attached to the cam type traverse device 12 through
With the roving 22 and the roving 22 separated, the traverse guide 1
I was guided to 3. The separation of the roving 21 and the roving 22 in the traverse guide 13 was achieved by the mounting positions of the upper guide guide 11 and the upper guide guide 11 'as shown in FIG. Details will be described later. The roving 21 and the roving 22 separated in the traverse guide 13 are traversed in the separated state while being wound up by the winding device 14.
Was wound up in. In other words, the roving 21 and the roving 22 are separated and wound up by the winding device 14 while traversing like one roving.

The resulting lobing package is shown in FIG.
As shown in (2), two rovings, that is, the roving 21 and the roving 22 were separately arranged substantially in parallel in the same wound layer. The thickness of the roving pulled out upon use is the roving 21 and the roving 22.
The total thickness was 6480 tex.

The roving package has an inner diameter of 180.
mm, outer diameter 450 mm, length 1000 mm and weight 22
It was 0 kg. After inserting this roving package into a heat-shrinkable film of polyvinyl chloride, it was heated at 110 ° C for 8 hours.
Heat treatment was carried out for a period of time to obtain a roving package package.

The mounting positions of the upper guide guide 11 and the upper guide guide 11 'for separating the roving 21 and the roving 22 in the traverse guide 13 will be described.
As shown in detail in FIG. 5, the upper guide guide 11 and the upper guide guide 11 'are located outside the extension line C of both ends 16 of the package 15, that is, with the extension line C as a base line.
Away from the center line 17 of the package 15
To W, specifically, at a position of 2700 mm. A traverse guide 13 having a groove width (L) of 12 mm was used.

When the traverse guide 13 having one groove width is used, the positions of the upper guide guide 11 and the upper guide guide 11 'may be positions other than between the two extension lines C. At this position, the roving 21 and the roving 22 are provided.
Were naturally separated by the tensions applied by the tension applying device 9 and the tension applying device 9 ', respectively, and were always wound at a substantially constant pitch P.

The outside of the extension line C of both end portions 16 of the package 15, that is, the position away from the package 15 with the extension line C as a base line is optional, but if it is too close, it will be extra in the roving. It is not preferable to apply a proper tension. The distance Z on the vertical line from the extension line C is preferably 100-500 mm. The distance W from the center line 17 of the package 15 is arbitrary, but is preferably 500-4000 mm.

The traverse guide groove width L changes depending on the type of roving, that is, the width T of the roving. Usually, it is preferably 1.2 to 2.5 times, particularly preferably 1.3 to 2.0 times the roving width. If the groove width is too narrow, the number of lobbings 21 and 22 is one. On the other hand, if it is too wide, the shape of the winding turn portion is hindered and a good package appearance cannot be obtained.

Upper guide guide 11 and upper guide guide 1
The position of 1'has been described when the traverse guide 13 having one groove width is used, but when the traverse guide 13 having a plurality of grooves is used, the positions thereof are different.

The roving was pulled out from the roving end of the obtained roving package 15, cut into 50 mm at a speed of 75 m / min, dispersed on a flat plate, and the dispersion state was visually observed. As a result, the dispersion of chopped strands from the package of the present invention was extremely good and no defective portion was observed. On the other hand, 6480 created by the conventional method
The dispersion of chopped strands from the tex roving package was poor and some defects were observed.

Further, even after stopping overnight while pulling out, collapse of the first layer 2 to several layers inscribed in the space portion 1 penetrating between both ends of the central portion occurred even after 10 experiments. There wasn't. On the other hand, in the case of a roving package of 6480 tex made by the conventional method, the collapse was repeated 9 times in 10 experiments.

[0046]

By using the roving package of the present invention, for example, in the production of SMC, roving distribution failure does not occur, and when the work is temporarily suspended,
That is, when pulling out of the roving is stopped, one or a few layers of the roving inscribed in the through space in the central portion of the package does not collapse, and the roving is pulled out from the package. The thickness of the bing can be increased to 1
The amount of roving processing per package can be significantly increased.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a package for explaining a lobing package of the present invention.

FIG. 2 is a schematic view showing a side surface of a package for explaining the package of the roving of the present invention.

FIG. 3 is a schematic side view of an apparatus for manufacturing a roving package according to the present invention.

FIG. 4 is a schematic top view of a winding section of an apparatus for manufacturing a roving package according to the present invention.

FIG. 5 is a schematic top view of an upper guide guide and a traverse guide of an apparatus for manufacturing a roving package according to the present invention.

[Explanation of symbols]

1. Space part that penetrates between both ends of the central part 1. The first layer of the package inscribed in the space that penetrates between both ends of the central part. Second layer of package inscribed in the space that penetrates between both ends of the central part 4. Third layer of package inscribed in space that penetrates between both ends of the center 5. Fourth layer of package inscribed in space that penetrates between both ends of center 7. Dry cake 8. Cake shelf 9. Tensioning device 10. Top guide 11. Top guide 12. Traversing device 13. Traverse guide 14. Winding device 15. Package 16. Both ends of the package 17. Center line of package

Claims (5)

[Claims] 1. A package in which a roving made by combining yarns is wound into a continuous wound layer in a range of 2500-2500.
A roving package, characterized in that a plurality of said rovings made up of 0 fibers are arranged in parallel in the same wound layer. 2. The roving is 4000-1500.
The roll according to claim 1, wherein the number is 0.
Bing package. 3. The roving is 5000-1000.
3. The roll according to claim 2, wherein the number is 0.
Bing package. 4. The roving package according to claim 1, wherein the plurality of rovings are two.
J. 5. The roving package according to claim 1, wherein the ratio of the longest diameter / the shortest diameter of the cross section of the fiber is 1.2 or more.