JPH0487972A - Shrink-packaged body for glass roving wound body and shrink-packaging method therefor - Google Patents

Abstract

PURPOSE:To obtain a shrink-packaged body of a glass roving wound body with excellent letting-out property for roving by a method wherein a non- shrinkable film is stretched by heating process and comes into contact with roving at the inner side from gaps of roving at the outermost layer of a glass roving wound body, and is bonded with a heat-shrinkable film. CONSTITUTION:A shrink-packaged body 10 is a packaged body for which a glass roving wound body 8 is shrink-packaged by a heat-shrinkable film 1 through a non-shrinkable film 5. The non-shrinkable film 5 is stretched by heating process, enters gaps between roving 2 at the outermost layer of the glass roving wound body 8, and comes into contact with roving 4 at a second layer at the inner side. Also, this non-shrinkable film 5 is adhered to the heat- shrinkable film 1. Therefore, the roving 2 at the outermost layer is adhered to the non-shrinkable film 5 which is adhered to the heat-shrinkable film 1. Also, roving 3 among the roving at the second layer is joined to the roving 2 at the outermost layer, and roving 4 is adhered to the non-shrinkable film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a shrink-wrapped glass roving roll and a shrink-wrapping method thereof, and particularly relates to a method for shrink-wrapping a glass roving roll at the end of its use. The present invention relates to a shrink-wrapped glass roving body that prevents deformation and improves the performance of unwinding the roving, and a shrink-wrapping method thereof.

[Prior Art] Glass roving is a typical processed product of glass strands obtained by attaching an adhesive to glass single fibers (filaments) during spinning and assembling the fibers in parallel to the length direction. Glass roving is made by pulling a predetermined number of glass strands together without twisting them, and the number of glass single fibers constituting the roving ranges from about 1,000 pieces to about tens of thousands of pieces. Since glass roving is not twisted, it has great strength in the longitudinal direction, making it suitable for making long objects such as rods and pipes. Furthermore, since it is supplied as a rolled body, it is easy to attach it to a continuous molding device, so it is widely used for supplying chopped strands to various molding methods. In addition, the filament winding method (FW method) is a molding method that has the highest mechanical properties among FRP.
Roving is also mainly used.

Conventionally, glass roving has been made as shown in Fig. 3(a).
Usually, after being wound up into a roll of about 20 kg/l to form a rolled body 11, this rolled body 11 is heated to a thin polyvinyl chloride heat-resistant material with a thickness of about 30 μm as shown in FIG. 3(b). Insert it into the shrink film packaging bag 12 (Fig. 3(C)), 15
By heat-treating at 0° C. for about 10 seconds, it is supplied as a shrink package 13. (In Figure 3(b), 2
The dashed dotted line indicates the heat-sealed portion. ) In the normal case, the size of the glass roving wound body 11 is as shown in FIG. 3(a).
Diameter 2r=250-850mm, height J2. =450～
It is about 1200mm. Further, as the film of the heat-shrinkable film packaging bag 12 for shrink packaging, other than polyvinyl chloride, polyethylene, polypropylene, etc. can also be used.

[Problems to be Solved by the Invention] The glass roving shrink package 13 wrapped in this manner is used while being unrolled from the packaging film sequentially from the inside, that is, from the beginning end of the roll.
Near the outermost layer of the roll, the glass roving tends to fall off within the packaging film and is often pulled out in a tangled manner.

In other words, since the glass roving is used by being unwound from the inner layer of the glass roving roll, several layers of the glass roving winding are left on the inner surface of the packaging film in the later stages of use, but the inside of the packaging film is When the number of wound layers of glass roving decreases to one or two layers, the wound layer of glass roving becomes displaced within the packaging film, and the upper part of the wound layer collapses into the lower part of the film. For this reason, the glass roving cannot be rolled out smoothly,
The glass roving is pulled up in a tangled state and is unwound from within the packaging film. Glass rovings that are ejected in a tangled manner may exist as roving lumps in final products such as FRP, which may have an adverse effect on product quality.

In particular, for large roving rolls such as 80 to 300 kg/l rolls, the winding diameter and height of the rolls are 2 to 4 mm compared to 20 kg/l rolls.
Since the roll becomes extremely large, the outermost layer of the wound body tends to collapse frequently, resulting in a decrease in unwinding performance, workability, and productivity.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a shrink-wrapped glass roving body with excellent roving edge-out properties and a shrink-wrapping method thereof.

[Means for Solving the Problem] The shrink-wrapped glass roving roll according to claim (1) is a package formed by shrink-wrapping a glass roving roll with a heat-shrinkable film via a non-shrinkable film. The non-shrinkable film is stretched by heat treatment and enters the gap between the outermost rovings of the glass roving roll and comes into contact with the inner roving of the outermost layer, and the non-shrinkable film and the The shrink-wrapping method for shrink-wrapping a glass roving roll according to claim (2), characterized in that the shrink-wrapper is bonded to a heat-shrinkable film, is the method for shrink-wrapping a shrink-wrapper according to claim (1) above. The method is characterized in that the glass roving roll is wrapped in a non-shrinkable film, then heat-treated at the stretching temperature of the non-shrinkable film, and then shrink-wrapped in a heat-shrinkable film.

[Function] Regarding the conventional glass roving packaging body, the present inventors
As a result of examining the causes of the roving collapsing and becoming tangled, the following findings were made.

Generally, about 1% of sizing agent is attached to glass roving, and in normal cases, when the glass roving roll is rolled out from the inside and used, it is heat-treated to prevent the roll from falling off. softens the sizing agent,
Lightly adhere adjacent rovings of the wound body. Further, the outermost roving of the wound body is lightly adhered to the heat-shrinkable film of the shrink wrap.

By the way, as shown in FIG. 2, in the shrink-wrapped body 10A of the conventional glass roving roll, the outermost layer roving 2 is lightly adhered to the heat-shrinkable film 1 of the shrink-wrap, so it does not fall off. hard. In addition, this outermost layer roving 2 and N immediately inside the outermost layer (hereinafter referred to as
It is called the "second layer." ) among the rovings, the roving 3 that is in contact with the outermost roving 2 is
The outermost layer of roving 2, which is difficult to fall off due to contact with the roving, is lightly bonded with the sizing agent as described above. Therefore,
This roving 3 is also difficult to fall off at the end of use. However, among the rovings of the second layer, the rovings 4 that are not in contact with the outermost layer roving 2 or are in slight contact with the outermost layer roving 2 are not in contact with the film 1, and are not in contact with the outermost layer roving 2. It has almost no adhesive strength, so it easily falls off. That is, in the conventional shrink package 10, the falling of the roving 4 of the second layer, which is in contact with the outermost roving 2 with only a very small adhesive force, at the end of the use of the wound body causes the roving to collapse. This was the main cause.

On the other hand, the shrink-wrapped glass roving body 10 of the present invention is produced by shrink-wrapping a glass roving body 8 with a heat-shrinkable film 1 via a non-shrinkable film 5, as shown in FIG. The non-shrinkable film 5 is stretched by heat treatment, enters the gap between the outermost rovings 2 of each glass roving body 8, and is in contact with the inner second layer roving 4. .

Moreover, this non-shrinkable film 5 is adhered to the heat-shrinkable film 1.

Therefore, the outermost layer roving 2 adheres to the non-shrinkable film 5 adhered to the heat shrinkable film of the shrink packaging film, and among the second layer rovings, roving 3
is adhered to the outermost layer roving 2, and the roving 4 is adhered to the non-shrink film. That is, since the inner layer roving is adhered to at least one of the outer layer roving and the non-shrinkable film 5, unwinding is prevented.

Such a shrink-wrapped body can be easily obtained by the shrink-wrapping method of the present invention.

[Examples] Examples of the present invention will be described below with reference to the drawings.

First, the shrink packaging method of the present invention will be explained.

FIG. 1 is an enlarged cross-sectional view of the outer layer of a shrink-wrapped glass roving body according to an embodiment of the present invention. As shown in FIG. 1, the shrink package 10 of the glass roving roll of this embodiment is produced by wrapping each glass roving roll 8 with a non-shrink film 5 according to the method of the present invention.
It was obtained by heat-treating the non-shrinkable film 5 at the stretching temperature and then shrink-wrapping it with the heat-shrinkable film 1.

The non-shrinkable film 5 used in the present invention is a film that has sufficient stretchability to enter the gap between the outermost layer rovings 2 and adhere to the second layer rovings 4 after being stretched by heating and stretching treatment. is necessary. The heating and stretching temperature is preferably approximately equal to the softening temperature of the sizing agent for the roving, ie, 70 to 140 t, particularly around 100°C. In such a temperature range, the softening treatment of the sizing agent and the stretching treatment of the non-shrinkable film can be performed in one heat treatment.

Further, as described above, the thickness of the non-shrinkable film is preferably relatively thin so as to fit well into the gaps between the outermost rovings 2.

For this reason, in the present invention, the non-shrinkable film has an elongation at 100°C of 5% or more, preferably 10 to 20%, and a thickness of 15 to 1100 p, especially 1
Non-stretched or non-shrinkable nylon films, non-stretched or non-shrinkable polyvinylidene chloride films, or non-stretched or non-shrinkable polyvinyl chloride films with a thickness of 5 to 40 μm are suitable.

After wrapping the glass roving roll with such a non-shrink film, the non-shrink film is stretched at a temperature of, for example, 70 to 140°C, preferably around 100°C, for about 10 to 60 seconds. do. Through this heat treatment,
As shown in FIG. 1, the non-shrinkable film 5 is stretched and adhered to the outermost layer of rovings 2, and also enters the gaps between the rovings 2 and adhered to the second layer of rovings 4 and the like.

Further, the rovings in each layer of the roving wound body are bonded together by the softening of the sizing agent.

After this heat treatment, shrink packaging is performed using a heat-shrinkable film 1 according to a conventional method.

By the way, as mentioned above, since the non-shrinkable film is thin, it lacks rigidity and is not self-supporting by itself. Therefore, it is necessary to adhere the non-shrink film 5 to the outer heat-shrinkable film 1 so that the non-shrink film 5 itself does not fall within the shrink package. Adhesion may be performed using an adhesive, but for example, when a polyvinyl chloride film is used as a heat-shrinkable film for shrink packaging, and a non-stretched or non-shrinkable polyvinyl chloride film is used as a non-shrink film. for,
This is extremely advantageous because the plasticizer in both films leaches out during the shrink-wrapping process and the two films naturally adhere without the use of special adhesives.

In this way, as shown in FIG. 1, the glass roving roll 8 is wrapped with the non-shrinkable film 5 and the heat-shrinkable film 1, and the non-shrink film 5 is heated and stretched to form the glass roving roll. The shrink package 10 of the present invention enters the gap between the outermost layer rovings 2 and adheres to the second layer glass roving 4, and the non-shrinkable film 5 and the heat-shrinkable film 1 are bonded. can get.

The present invention is directed to the third
It is extremely effective for shrink-wrapping glass roving rolls with a height k of 450 mm or more in Figure (a), but for cases where A<450 mm, for example, β=2
Needless to say, it can also be effectively applied to a wound glass roving body of about 50 mm.

Specific examples will be described below.

Example 1 A glass roving roll with a diameter of 420 mm, a height of 1000 mm, and a 165 kg/l roll was wrapped with the following non-shrink film, heated at 105°C for 40 seconds to stretch the film, and then wrapped in ordinary shrink packaging. It was shrink-wrapped using the polyvinyl chloride film used in a conventional manner.

Elongation at 100°C: 25% Thickness = 20 μm As a result, the non-shrinkage film enters the gap between the outermost rovings of the glass roving roll, and the second
A shrink package was obtained in which the non-shrink film adhered to the roving of the layer and also the shrink film.

This package was able to be smoothly and smoothly edged without the roving collapsing within the packaging film or becoming tangled until reaching the end of the glass roving.

[Effects of the Invention] As detailed above, according to the shrink-wrapped glass roving roll and its shrink-wrapping method of the present invention, the glass roving roll collapses within the packaging film at the end of use of the glass roving. A good package is provided in which the glass roving can be smoothly rolled out as a single piece of roving without any tangles reaching the end of the glass roving.

According to the present invention, it is possible to greatly improve the ease of unwinding and workability of glass roving even in the case of a huge glass roving package of 100 to 200 kg and 710 kg.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of essential parts showing an embodiment of the shrink-wrapped glass roving body of the present invention, Fig. 2 is an enlarged sectional view of main parts showing a conventional example, and Fig. 3 is an explanation of shrink packaging. It is a diagram. 1... Heat-shrinkable film, 2.3.4... Roving, 5... Non-shrinkable film, 10... Shrink packaging body. Agent Patent Attorney Tsuyoshi Shigeno (C1) (C) (b) -2X

Claims (2)

[Claims] (1) A package formed by shrink-wrapping a glass roving roll with a heat-shrinkable film via a non-shrink film, the non-shrink film being stretched by heat treatment to form the glass roving roll. A shrink-wound glass roving body characterized in that the non-shrinkable film and the heat-shrinkable film are bonded to each other by entering a gap between the rovings in the outermost layer and contacting the rovings inside the outermost layer. packaging. (2) The glass according to claim (1), wherein the glass roving roll is wrapped in a non-shrinkable film, then heat-treated at the stretching temperature of the non-shrinkable film, and then shrink-wrapped with a heat-shrinkable film. A shrink-wrapping method for shrink-wrapping a roving roll.