JPH0692367A - Glass fiber roving packing body - Google Patents

Abstract

PURPOSE:To provide a shrink packing body of a roving, which can pull out a strand bundle by normal tensil force even if there are loops on a bottom end of the roving. CONSTITUTION:A center axis Ho of a roving cylinder portion 3 is set horizontally, and a roving 2 is placed so as not to load own weight onto a bottom end 5. In this state, when a shrink bag 1 is shrunk by heat-application, loops 7 of a strand bundle 6 on the roving bottom end 5 are directed toward the center area of the roving cyliner portion 3 in accompanying with the shrinkage of the shrink bag 1, and bonded to the shrink bag 1 being heat-shrinked while being bent. Even if the strand bundle 6 is pulled out therefrom, since the loops 7 exsist inner side of the strand bundle 6, the loops are not pressed onto a placing table by own weight of the roving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink-wrapped roving, and more particularly to a glass fiber roving which prevents the bottom of the roving from being caught when the strand bundle is pulled out.

[0002]

2. Description of the Related Art A glass fiber strand is obtained by adhering an adhesive during the spinning of glass single fibers and assembling them in parallel to the fiber length direction. There is glass fiber roving as a processed product in which the strands are not twisted in a predetermined number and are aligned.

As shown in FIG. 4, the glass fiber roving 15 is wound around about 20 to 300 kg per roll, and is a wound body having a through space 16 in the center. This wound body is placed in a heat shrinkable film package (shrink bag) 17 made of polyvinyl chloride or the like having a thickness of about 30 μm, and heat-treated to form a shrink package. Then, as shown in FIG. 5, the shrink wrapping body 19 of the glass fiber roving 15 is used while rolling out the strand bundle 20 from the winding start end of the winding body in the through space 16 at the center thereof. It

Since the glass fiber roving 15 is not twisted, it has a large strength in the length direction and is used as a material for long objects such as pipes. Further, since the glass fiber roving 15 is supplied as a wound body, it can be easily mounted on a continuous molding device and is widely used for supplying chopped strands in various molding methods.

FIG. 6 shows a diameter of 500 mm and a length of 1000 m.
Shrink-wrapped jumbo glass fiber roving having a weight of m and a weight of about 250 kg (hereinafter, the glass fiber rovings of various sizes may be simply referred to as roving).
It is drawing which shows a mode that the corrugated cardboard 22 was laid on four pallets 21 and was mounted.

[0006]

[Problems to be Solved by the Invention] Conventionally, roving 15
As shown in FIG. 7, the shrink wrapping was carried out in a state in which the cylindrical roving 15 was erected with one end surface as the bottom surface. Therefore, the shrink bag 17 on the roving bottom surface side
Even if there is an overlapping portion 23, the overlapping portion 23 of the shrink bag 17 after heat treatment due to the weight of the roving 15 does not show the pallet 21 (cardboard 22 is not shown in FIGS. 7 and 8) after heat treatment. ), The overlapping portion 23 is shrunk and remains in the form of wrinkles.
Therefore, the end face loop 25 at the bottom portion of the roving is also shrink-wrapped in the shape before the heat treatment.

Thus, when the strand bundle 20 is pulled out from the inside of the shrink-wrapped roving 15 and used, it sometimes gets caught at the bottom and does not come out.
The reason is that the loop 25 at the bottom end included in the strand bundle 20 is pressed against the pallet 21 by the weight of the roving 15. Therefore, at the time of production of a sheet molding compound (SMC) produced by arranging 30 to 50 chopped strands in parallel between sheets, the strand bundle 20 is partially cut into a cutter (one that cuts the strand bundle into set dimensions).
Was not supplied, and a portion where the strand bundle 20 was not supplied was in a yarn pull-out state, and a perforation phenomenon sometimes occurred.

Therefore, even if the bottom end of the roving has a loop, according to the present invention, by the normal pulling force,
An object of the present invention is to provide a roving shrink package in which a strand bundle can be pulled out smoothly.

[0009]

The above objects of the present invention can be achieved by the following constitutions. That is, in a roving package formed by shrink-wrapping glass fiber roving with a heat-shrinkable film, the shrink bag is heat-shrinked without applying the weight of the roving to the bottom end of the roving, and the bottom end loop of the roving is The roving package is held in a state of being bent toward the center of the roving.

The state where the weight of the roving is not applied to the bottom end of the roving can be set, for example, by setting the central axis of the roving cylindrical portion in the horizontal direction or a state close thereto.

[0011]

For example, the central axis of the roving cylindrical portion is set along the horizontal direction, and the bottom end portion is placed in a state where the weight of the roving is not applied. When the shrink bag is heat-shrinked in this state, the loop of the strand bundle at the bottom end of the roving is directed toward the center of the roving cylindrical portion as the shrink bag shrinks. When the center axis of the roving cylindrical portion is set along the horizontal direction, the loop is light in weight and has rigidity, so that it is almost horizontal. Therefore, even in the lower half of the roving, the shrink easily points to the center of the roving. Then, the loop is kept in a bent state and closely adheres to the shrink bag that shrinks heat.

Further, the center axis of the roving cylinder is set in the horizontal direction, and the bottom end is placed in a state in which the weight of the roving is not applied, and the shrink bag at the bottom end is placed in the through hole portion at the center of the roving cylinder. When pulled inward, the roving bottom end loop is bent toward the center of the roving. When the shrink bag is heat-shrinked in this state, at least the roving bottom end loop in the upper half of the cylindrical portion of the roving is in close contact with the shrink bag while being bent toward the center of the roving.

Even if the bottom end of the cylindrical portion of the thus obtained roving package is placed downward and the strand bundle is pulled out from this, since the loop of the strand bundle is inside the strand bundle, the loop is owing to the weight of the roving. It is never pressed against the pallet. Therefore, the loop is not pressed against the roving, and the normal pulling force of the strand bundle (force to pull lightly with your hand ≒
It can be pulled out smoothly by several hundred g.

[0014]

Embodiments of the present invention will be described with reference to the drawings. Example 1 FIG. 1 is a partial cross-sectional view showing a state before the heat treatment with the central axis H ₀ of the cylindrical portion 3 of the roving 2 previously stored in the shrink bag 1 being horizontal. At this time, the bottom end 5 of the roving 2 is not loaded with its own weight, so when the heat treatment step is started from the state of FIG. 1, the loop 7 of the strand bundle 6 located at the bottom end 5 of the roving 2 is The shrinkable bag 1 is bent toward the center of the roving cylinder 3 in accordance with the heat shrinkage of the shrink bag 1. The heat treatment at this time is roving 2
It is desirable to adjust so that the shrink bag 1 is thermally contracted toward the central portion of the cylindrical portion 3 in which the through-hole 9 is formed.

Next, the roving 2 is set up. That is, the central axis of the cylindrical portion 3 is oriented in the vertical direction. In this way, the heat treatment is further continued so that the entire shrink bag 1 is thermally contracted.

When the heat treatment is performed in two stages as described above,
In the latter half of the heat treatment step, even if the shrinkage of the shrink bag 1 at the roving bottom end portion 5 is attempted toward the outside, that is, toward the outer peripheral side of the cylindrical portion 3, the bottom end loop 7 is caused by the weight of the roving 2. It is held on a pallet (not shown) and can be held in a state of facing the center of the cylindrical portion 3.

Thus, when the strand bundle 6 is pulled out from the through space 9 on the central side of the roving 2, even if there is a loop 7 of the strand bundle 6 at the roving bottom end 5, the position of the loop 7 is present. Is a portion of the strand bundle 6 that has already been pulled out, and is located in the through space portion 9 having a diameter enlarged according to the pulling out of the strand bundle 6. Therefore, the loop 7 can be smoothly pulled out by the normal pulling force of the strand bundle 6 (force of pulling lightly with hands ≈several hundred g) without being pressed against the roving 2.

Embodiment 2 In this embodiment, like the embodiment 1 shown in FIG. 1, the roving 2 which is previously housed in the shrink bag 1 is set so that the central axis H ₀ of the cylindrical portion 3 is horizontal. Then, as shown in FIG. 2, the shrink bag 1 is pulled in from the roving bottom end 5 into the through space 9 at the center of the cylindrical portion 3. Thus
The strand bundle loop 7 at the bottom end 5 of the roving 2 is pulled in the through space 9 of the shrink bag 1,
It is bent toward the center of the roving cylinder 3. Next, as shown in FIG. 3, the roving 2 is stood upright, placed on the pallet 10 and heat-treated to heat-shrink the shrink bag 1 as a whole.

When the heat treatment is performed in this way, even if the shrinkage of the shrink bag 1 at the roving bottom end 5 is attempted toward the outside, that is, toward the outer peripheral side of the cylindrical portion 3 in the heat treatment step, the bottom end is reduced. The loop 7 is held by the weight of the roving 2 and can hold the state of facing the center of the cylindrical portion 3.

Thus, even if the strand bundle loop 7 is located at the bottom end 5 of the roving 2 as in the first embodiment, the strand bundle loop 7 can be smoothly pulled out by the normal strand bundle pulling force without being pressed against the roving 2.

[0021]

According to the present invention, even if there is a loop of the strand bundle at the bottom end of the roving, since the loop is inside the strand bundle, the roving is removed when the strand bundle is pulled out. Since the bottom end loop is not pressed by its own weight, it can be pulled out smoothly. Therefore, for example, at the time of producing a sheet molding compound (SMC), the strand bundle is not partially supplied to the cutter, and there is no possibility that a perforation phenomenon due to yarn loss occurs.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state before packaging a roving according to a first embodiment of the present invention with a shrink bag.

FIG. 2 is a partial cross-sectional view showing a state before packaging the roving of Example 2 of the present invention with a shrink bag.

FIG. 3 is a partial cross-sectional view showing a state before the roving of the second embodiment of the present invention is wrapped in a shrink bag and the entire heat treatment is performed.

FIG. 4 is a state diagram of the roving before shrink-wrapping.

FIG. 5 is a perspective view showing a roving shrink package.

FIG. 6 is a perspective view showing a state in which jumbo roving is placed on a pallet.

FIG. 7 is a partial cross-sectional view showing a state before heat treatment for shrink wrapping of roving in the related art.

FIG. 8 is a partial cross-sectional view showing a state where heat treatment is performed from the state of FIG.

[Explanation of symbols]

1, 17 ... Shrink bag, 2, 15 ... Roving (rolled body), 3 ... Cylindrical part, 5 ... Bottom end part, 6, 20 ... Strand bundle, 7, 25 ... Strand bundle loop, 9, 16 ... Penetration Space, 10, 21 ... Pallet

Claims (1)

[Claims] 1. A roving package in which glass fiber roving is shrink-wrapped with a heat-shrinkable film, wherein the shrink bag is heat-shrinked without the weight of the roving being applied to the bottom end of the roving. A glass fiber roving package, wherein the partial loop is held in a state of being bent toward the center of the roving.