WO2023145485A1

WO2023145485A1 - Method for forming wound body of glass chopped strand mat, and wound body of glass chopped strand mat

Info

Publication number: WO2023145485A1
Application number: PCT/JP2023/000777
Authority: WO
Inventors: 怜央寺平
Original assignee: 日本電気硝子株式会社
Priority date: 2022-01-28
Filing date: 2023-01-13
Publication date: 2023-08-03
Also published as: JP2023110581A

Abstract

Provided is a method for forming a wound body of a glass chopped strand mat, the method making it possible to easily and reliably wind a glass chopped strand mat onto a core. The present invention comprises a step for bringing at least part of the distal-end section (M1) of a glass chopped strand mat (M) into contact with a core (72) along the outer peripheral surface (72a) of the core (72) and causing the core (72) to rotate, thereby forming a wound body (R) by winding the glass chopped strand mat (M) into a rolled form. The outer peripheral surface (72a) of the core (72) has an irregularity region (A) comprising projecting protrusions (75) that have adhesive properties and are formed by applying a resin to the outer peripheral surface (72a), and depressed recesses (72) that do not have adhesive properties.

Description

Method for forming glass chopped strand mat roll and glass chopped strand mat roll

The present invention relates to a method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands and a roll of a strip-shaped glass chopped strand mat.

BACKGROUND ART Conventionally, a glass chopped strand mat formed by molding cut glass fibers (hereinafter referred to as glass chopped strands) into a mat shape is known.
The glass chopped strand mat is usually cut into strips by a slitter, wound around a core made of paper as a structural material, and the glass chopped strand is a roll-shaped final product centered around the core. It becomes a winding body of the mat.

In the process of making such a glass chopped strand mat into a wound body of the glass chopped strand mat, in order to wind the glass chopped strand mat around the core, a member for joining the core and the glass chopped strand mat is not used. Another method is known in which the leading edge of a glass chopped strand mat is wound directly around a winding core (see, for example, Patent Document 1).

However, with the method described in Patent Document 1, it is difficult to reliably wind the glass chopped strand mat around the winding core, and the winding core idles in the initial stage of winding, causing a gap between the glass chopped strand mat and the winding core. There was a discrepancy. As a result, there is a problem that the glass chopped strand mat is wound while protruding from the winding core, and the glass chopped strand mat is broken. These were major technical issues in terms of quality and production efficiency.

In order to solve this problem, in the method of winding the belt-shaped material around the winding core, an adhesive such as adhesive tape is used on the surface of the winding core, and the winding start end portion of the belt-shaped material is attached to the surface of the winding core. It is known to fix the ends so that they cannot be loosened later. (See, for example, Patent Document 2). According to this method, it is possible to wind the strip material around the winding core to some extent.

JP 2009-154996 A WO2015/118985

However, in the winding method using the conventional adhesive, problems sometimes occurred due to the adhesive strength of the adhesive. In other words, the glass chopped strand mat cannot be stably wound up if a sufficient amount of adhesive is not applied to the surface of the winding core. On the other hand, when an excessive amount of adhesive is placed on the surface of the winding core, the proportion of the adhesive portion on the surface of the winding core increases, and the glass chopped strand mat after winding sticks to the winding core. It becomes easier, and the risk of wrinkles and torn pieces increases.

The present invention has been made in view of such current problems, and is a band-shaped glass chopped strand mat containing glass chopped strands that can stably wind up the glass chopped strand mat and prevent wrinkles and tearing. The object of the present invention is to provide a method for forming a wound body and a wound body of a strip-shaped glass chopped strand mat.

The problem to be solved by the present invention is as described above, and the means for solving this problem will be explained next.

A method for forming a roll of a glass chopped strand mat according to the present invention is a method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands, comprising:
At least part of the tip of the glass chopped strand mat is brought into contact with the outer peripheral surface of the winding core and the winding core is rotated to wind the glass chopped strand mat into a roll to form a wound body. Equipped with a process,
The outer peripheral surface of the winding core has a convex portion having adhesiveness and a concave portion having no adhesiveness, and extends along the rotation axis direction of the winding core, and the range in which the convex portion and the concave portion are provided A plurality of strip-shaped uneven regions having a width in the direction along the outer peripheral surface including
The width is within the range of 20 to 50 mm,
The convex portion is configured by a plurality of circles or polygons configured by outlines,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the direction of the outer peripheral surface is in the range of L/12 to L/4, where L is the diameter of the winding core.

According to such a configuration, an uneven region consisting of a convex portion having adhesiveness and a concave portion having no adhesiveness is provided on the outer peripheral surface of the core, and the shape of the uneven region etc. is strictly regulated. It is possible to reliably wind the chopped strand mat, and efficiently produce a wound body having a good winding appearance. In addition, when the glass chopped strand mat is pulled out from the winding body of the glass chopped strand mat and used up, even if the pulled out glass chopped strand mat is pulled, the glass chopped strand mat can be easily separated from the winding core, so wrinkles and unevenness can occur. It is possible to prevent the occurrence of cuts and the like.

In this specification, the phrase “within a range of X to Y mm in width” refers to the case where the width of all of the plurality of uneven regions is within the range of X to Y mm. is within the range of L/A to L/B where L is the diameter of the winding core" means that all the intervals in the outer peripheral surface direction of the plurality of uneven regions are in the range of L/A to L/B is included in

Further, a method for forming a roll of a glass chopped strand mat according to the present invention is a method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands, comprising:
At least part of the tip of the glass chopped strand mat is brought into contact with the outer peripheral surface of the winding core and the winding core is rotated to wind the glass chopped strand mat into a roll to form a wound body. Equipped with a process,
The outer peripheral surface of the winding core has a convex portion having adhesiveness and a concave portion having no adhesiveness, and extends along the rotation axis direction of the winding core, and the range in which the convex portion and the concave portion are provided A plurality of strip-shaped uneven regions having a width in the direction along the outer peripheral surface including
The width is within the range of 20 to 50 mm,
The convex portion is configured by a spiral extending in the axial direction of the winding core, which is configured by a contour line,
Including 3.5 to 15 spiral circles per 20 mm in the rotation axis direction of the uneven region,
In the rotation axis direction of the uneven region, the number of intersections of the convex portions per 20 mm is 40 to 300, and the number of intersections where four or more of the contour lines overlap at one point is 0,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the direction of the outer peripheral surface is in the range of L/12 to L/4, where L is the diameter of the winding core.

Further, in the method according to the present invention, it is preferable that the uneven area occupy 20 to 60% of the outer peripheral surface of the winding core.

In this way, by keeping the exclusive area of the uneven region with respect to the outer peripheral surface of the winding core within a predetermined range, the end portion or the vicinity of the end portion of the glass chopped strand mat is adhered to the convex portion of the uneven region of the winding core, and the glass chopped The strand mat can be reliably wound up, and when the glass chopped strand mat is pulled out from the winding body of the glass chopped strand mat and used up, even if the pulled out glass chopped strand mat is pulled, the glass chopped strand mat is provided. can be easily separated from the core, preventing the occurrence of wrinkles, tearing, and the like.

Further, in the method according to the present invention, it is preferable that the diameter L of the winding core is 80 to 150 mm.

Since the diameter L of the winding core is set to 80 to 150 mm in this manner, a sufficient area can be reserved for the projections of the uneven region, and the tip end portion or the vicinity of the tip end of the glass chopped strand mat is placed in the uneven region of the winding core. The glass chopped strand mat can be reliably wound up by adhering it to the projections.

The wound body according to the present invention is a wound body of a glass chopped strand mat having a winding core and a roll-shaped glass chopped strand wound around the winding core,
An uneven region is formed on the outer peripheral surface of the winding core, and the convex portion of the uneven region has adhesiveness,
A plurality of strip-shaped uneven regions extending along the rotation axis direction of the winding core and having a width in the direction along the outer peripheral surface including the range where the protrusions and recesses are provided are formed,
The width is within the range of 20 to 50 mm,
The convex portion is configured by a plurality of circles or polygons configured by outlines,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the direction of the outer peripheral surface is in the range of L/12 to L/4, where L is the diameter of the winding core.

Further, the wound body according to the present invention is a wound body of a glass chopped strand mat having a winding core and a roll-shaped glass chopped strand wound around the winding core,
An uneven region is formed on the outer peripheral surface of the winding core, and the convex portion of the uneven region has adhesiveness,
A plurality of strip-shaped uneven regions extending along the rotation axis direction of the winding core and having a width in the direction along the outer peripheral surface including the range where the protrusions and recesses are provided are formed,
The width is within the range of 20 to 50 mm,
The convex portion is configured by a spiral extending in the axial direction of the winding core, which is configured by a contour line,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the direction of the outer peripheral surface is in the range of L/12 to L/4, where L is the diameter of the winding core.

According to such a configuration, the uneven area is composed of the adhesive protrusions and the non-adhesive recesses, and by strictly regulating the shape of the uneven area, the glass chopped strand mat When pulling out the glass chopped strand mat from the winding body and using up the mat, even if the pulled out glass chopped strand mat is pulled, the tip of the glass chopped strand mat or the entire vicinity of the tip may stick to the core. In comparison, since the glass chopped strand mat is easily separated from the core, damage such as breakage can be prevented.

Further, in the wound body, the convex portion is composed of a plurality of circles formed by outlines,
When the circle formed from the outline is expressed as x ² /a ² +y ² /b ² = 1 (a is the elliptical radius in the same direction as the long side direction of the core, b is the short side direction of the core) Elliptical radii in the same direction), the constants a and b are in the range of 10 to 25, and preferably b is greater than a.

As a result, since the long axis is arranged in a direction parallel to the winding direction of the core, it is possible to arrange circular or elliptical patterns close to each other in a direction parallel to the axial direction of the core.

The effects of the present invention are as follows.

According to the method of the present invention, by providing an uneven area having adhesiveness on the outer peripheral surface of the winding core and strictly regulating the shape of the uneven area, etc., the end portion or the vicinity of the end portion of the glass chopped strand mat is wound. It adheres to the uneven area of the core, so that the glass chopped strand mat can be reliably wound up, and a wound body with a good winding appearance can be efficiently produced.

Further, according to the wound body according to the present invention, the uneven region is composed of a convex portion having adhesiveness and a concave portion having no adhesiveness, and the shape etc. of the uneven region is strictly regulated, so that the glass chopped strand When the mat is pulled out and used up, even if the pulled out glass chopped strand mat is pulled, the glass chopped strand mat can be easily separated from the winding core, so that breakage or the like can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the overall configuration of a production apparatus for producing a roll of glass chopped strand mat according to one embodiment of the present invention. FIG. 4 is an explanatory view of the operation of the glass chopped strand mat manufacturing apparatus according to the embodiment of the present invention, showing the initial stage of winding. FIG. 4 is an operation explanatory diagram of the glass chopped strand mat manufacturing apparatus according to the embodiment of the present invention, showing a state in which the glass chopped strand mat is being wound up along the guiding member. FIG. 4 is an operation explanatory view of the apparatus for manufacturing the glass chopped strand mat according to the embodiment of the present invention, showing a state in which the glass chopped strand mat has made one turn around the winding core. FIG. 4 is an explanatory view of the operation of the glass chopped strand mat manufacturing apparatus according to the embodiment of the present invention, in which the guide member moves in the direction in which the distance from the winding cylinder becomes larger than the outer peripheral position of the winding body when it is fully wound. The figure which shows the state after evacuation. FIG. 4 is an operation explanatory view of the apparatus for manufacturing the glass chopped strand mat according to the embodiment of the present invention, and is a diagram showing the wound body when the glass chopped strand mat is fully wound. FIG. 4 is a perspective view showing a winding core in which projections are formed by a plurality of circles or polygons formed by outlines; FIG. 4 is a diagram showing an example of the shape of an uneven region; FIG. 4 is a diagram showing an example of the shape of an uneven region; FIG. 4 is a diagram showing an example of the shape of an uneven region; FIG. 10 is a side view showing an example of the shape of an uneven region; FIG. 4 is a perspective view showing a winding core in which convex portions are formed by spirals formed by outlines;

Next, embodiments of the invention will be described.
In the present invention, when a band-shaped glass chopped strand mat slit and cut by a slitter device is wound around a core, the tip of the glass chopped strand mat is brought into contact along the outer peripheral surface of the core and a predetermined slit is provided on the outer peripheral surface. is a method of forming a wound body of a glass chopped strand mat by adhering it to an uneven region having adhesiveness and winding it into a roll.

[Overall Configuration of Manufacturing Apparatus 1]
First, the overall configuration of an apparatus 1 for manufacturing a roll R of a glass chopped strand mat M, which includes a winding device 70 that embodies a method for forming a roll of a glass chopped strand mat according to an embodiment of the present invention. will be described with reference to FIG.
The manufacturing device 1 is a device for manufacturing a glass chopped strand mat M from a glass cake C and making the manufactured glass chopped strand mat M into a roll R of the glass chopped strand mat M. A conveyor 20, a binder application device 30, a heating furnace 40, a cold pressure roll 50, a winding device 70, and the like are provided.

The cutting machine 10 is a device for producing chopped strands S from the glass fibers F wound around the glass cake C, and includes a cutter roller 11 and a rubber roller 12 that are arranged facing each other.

The cutting machine 10 includes a rotating cutter roller 11 and a rubber roller 12, and feeds the glass fibers F pulled out of the glass cake C between the cutter roller 11 and the rubber roller 12 to continuously cut the glass fibers F. It is configured so that the glass chopped strands S can be continuously produced by cutting the strands.

The glass fiber F is cut into glass chopped strands S having a length of 10 mm or more and 100 mm or less by a cutting machine 10 . If the length of the glass chopped strands S is less than 10 mm, a large amount of binder is required to produce the glass chopped strand mat. As a result, it becomes easy to slip on the outer peripheral surface 72a of the winding core 72, so that it becomes difficult to stably wind the manufactured glass chopped strand mat M around the winding core. If the length of the glass chopped strands S exceeds 100 mm, the surface of the glass chopped strand mat M becomes rough, resulting in an increase in the dynamic friction coefficient, which tends to make winding difficult.
From the above viewpoints, the length of the glass chopped strands S is preferably in the range of 20 mm to 70 mm, more preferably in the range of 30 mm to 60 mm, and still more preferably in the range of 45 mm to 55 mm.

The conveyer 20 is a device for horizontally conveying the glass chopped strands S, S... produced by the cutting machine 10, and is composed of a first conveyor 21, a second conveyor 22, and a third conveyor 23. It is
In addition, the conveyer 20 includes a first conveyer 21, a second conveyer 22, and a third conveyer 23 in order from the upstream side in the conveying direction of the glass chopped strands S.S. are arranged consecutively.

Each of the

conveyors

21, 22, and 23 has a driving roller and a driven roller, and each roller is provided with a conveyor belt B composed of an endless mesh belt having an opening diameter smaller than the length of the glass chopped strands S. It is wound and constitutes a conveyor device.

Each of the

conveyors

21, 22, and 23 has a configuration in which the drive rollers are driven by motors to rotate the conveyor belt B along the rollers.

The first conveyor 21 has a first conveyor belt B<b>1 and is installed below the cutting machine 10 .
A chamber 13 is arranged on the first conveyor 21, and the glass chopped strands S cut by the cutter 10 pass through the chamber 13 and fall onto the first conveyor belt B1.

A suction device (not shown) consisting of a suction duct and a blower is arranged below the first conveyor belt B1, and while sucking the chopped strands S dispersed and deposited on the first conveyor belt B1, It is configured so that it can be

The second conveyor 22 has a mesh-like second conveyor belt B2 for conveying the chopped strands S.

Here, a binder application device 30 is arranged above the second conveyor 22 .
The binder application device 30 sprays a binder P, which is a resin powder, toward the glass chopped strands S on the second conveyor belt B2 of the second conveyor 22 to form the glass chopped strands S・It is a device for adhering a binder P to S.

As the type of the binder P, a thermoplastic resin powder is suitable, and for example, a powdered polyester resin (for example, Nutrack (registered trademark) 514, manufactured by Kao Corporation, etc.) can be used.
Other usable thermoplastic resin powders include resin powders of nylon, polyethylene, polystyrene, polypropylene, polyvinyl chloride, and the like.

Then, the glass chopped strands S on the second conveyor 22 are conveyed downstream to the third conveyor 23 with the binder P uniformly adhered thereto.

A water sprayer (not shown) may be provided on the upstream side of the binder application device 30 .
When the glass chopped strands S are moistened in advance with water, the surface tension of the water makes it easier for the binder P to adhere to the surface of the glass chopped strands S, so that the adhesion effect between the glass chopped strands S increases. higher. As a result, the amount of binder used can be reduced, the surface of the glass chopped strand mat can be prevented from becoming slippery, and winding becomes easy.

A heating furnace 40 is arranged so as to enclose part of the third conveying belt B3 of the third conveyor 23 .
The heating furnace 40 heats the glass chopped strands S, S . . . It is configured to be meltable.

The temperature of the atmosphere in the heating furnace 40 is appropriately adjusted so as to be equal to or higher than the melting point of the synthetic resin forming the binder P to be sprayed.

A cold pressure roll 50 is arranged downstream of the third conveyor 23 . The cold pressure roll 50 is composed of a pair of

rollers

51,51.

The glass chopped strands S.S.
At this time, the glass chopped strands S.S. A mat-like glass chopped strand mat M made of the adhesive P is molded.

A guide member 60 is arranged downstream of the cold pressure rolls 50 .
The guide member 60 is a plate-shaped member that guides the glass chopped strand mat M to the winding device 70 located obliquely below the cold pressure rolls 50 .

A winding device 70 is arranged downstream of the cold pressure roll 50 .
As shown in FIGS. 2 and 3, the winding device 70 brings at least a portion of the front end portion M1 of the glass chopped strand mat M into contact along the outer peripheral surface 72a of the core 72, and the outer peripheral surface 72a of the core 72. The entire width in the width direction of the glass chopped strand mat M is adhered to the adhesive uneven area A (see FIG. 7) provided in a substantially strip shape, and the winding core 72 is rotated to wind the glass chopped strand mat M into a roll. It is an apparatus for realizing the process of taking and forming the wound body R.
The details of the uneven area A will be described later.

The winding device 70 includes a pair of rolls 71 driven to rotate in the same direction, a guide member 73, and a retracting means (not shown). A winding core 72 is arranged above the upper valley between the pair of rolls 71 . The winding core 72 is driven to rotate by the driving rotation of the pair of rolls 71 .

The winding device 70 rotates the glass chopped strand mat M supplied from one roll 71 side (upstream side) of the pair of

rolls

71 and 71 by driving rotation of the pair of

rolls

71 and 71 and driven rotation of the core 72 . A wound body R is formed by winding around the outer peripheral surface 72a of the winding core 72 by the rotation.

The guide member 73 has a guide surface 73a that has a curvature along the outer peripheral surface 72a of the winding core 72 and faces the outer peripheral surface 72a with a gap therebetween, and is arranged so as to be movable in a predetermined direction.

When winding the glass chopped strand mat M, the guide member 73 is arranged to face the outer peripheral surface 72a of the winding core 72 with a predetermined gap therebetween.
Further, the tip M1 of the glass chopped strand mat M is wound around the outer peripheral surface 72a of the winding core 72, and the tip M1 is wound on the upper layer of the glass chopped strand mat M and the winding core 72. is sandwiched between
Then, when the leading end portion M1 of the glass chopped strand mat M is clamped, the retracting means moves the guide member 73 so that the guide surface 73a is located outside the outer peripheral position of the glass chopped strand mat M when the winding of the glass chopped strand mat M is completed. Evacuate and move.

[Operation of winding device 70]
Next, a series of operations of the winding device 70 that embodies the method for forming the wound body R of the glass chopped strand mat M according to one embodiment of the present invention will be described in detail with reference to FIGS. explain.

The glass chopped strand mat M formed in a belt shape is conveyed at a predetermined speed by using conveying means such as conveyor rollers, and as shown in FIG. It is supplied to the winding device 70 from one side of the rolls 71 (diagonally upper left side in the figure).

A winding core 72 is rotatably arranged around a central axis 74 above the valley portion of the upper surface between the pair of rolls 71 , and the leading end portion M 1 of the glass chopped strand mat M is wound around the outer peripheral surface of the roll 71 . When entering the gap between the outer peripheral surface 72 a of the core 72 , the core 72 rotates following the driving rotation of the roll 71 .
Thereby, the glass chopped strand mat M is wound around the outer periphery of the winding core 72 .

A guide member 73 having a guide surface 73 a is arranged along the core 72 on the radially outer side of the core 72 .
A guide surface 73a of the guide member 73 has a curvature along the outer periphery of the winding core 72 and faces the outer peripheral surface 72a of the winding core 72 with a predetermined gap therebetween.

The leading end portion M1 of the glass chopped strand mat M that has entered the gap between the roll 71 and the core 72 is sent by the driving rotation of the roll 71 and the driven rotation of the core 72, and is separated from the outer peripheral surface 72a of the core 72. It enters the gap between the guiding member 73 and the guide surface 73a.

Then, as shown in FIG. 3, the leading end portion M1 that has entered the gap advances while being guided along the guide surface 73a of the guide member 73, and contacts along the outer peripheral surface 72a of the winding core 72. The front end portion M1 of the glass chopped strand mat M or a portion near the front end portion M1 adheres to the sticky convex portion 75 (see FIG. 7) of the uneven area A, and the glass chopped strand mat M is attached to the outer peripheral surface of the winding core 72. 72a.
Here, the vicinity of the front end portion M1 of the glass chopped strand mat M is a portion within a size range of, for example, 300 mm from the front end of the glass chopped strand mat M in the longitudinal direction of the glass chopped strand mat M.

After that, as shown in FIG. 4, the tip portion M1 goes around (one round) the outer peripheral surface 72a of the winding core 72, and is sandwiched between the glass chopped strand mat M wound on the upper layer and the winding core 72. .

Then, the glass chopped strand mat M is wound several times, and as shown in FIG. It is retracted in the radial direction (S direction) of the winding core 72 so as to be positioned outside the outer peripheral position (the outer peripheral position of the wound body when fully wound).
As a result, the guide surface 73a of the guide member 73 does not interfere when the glass chopped strand mat M is wound.

Through such a series of operations, the guide surface 73a of the guide member 73 smoothly moves so that the leading end portion M1 of the glass chopped strand mat M is reliably laminated on the outer peripheral surface 72a of the winding core 72 at the initial stage of winding. Allows for winding. Thus, a roll R of the glass chopped strand mat M as shown in FIG. 6 can be obtained.

Any material may be used as the material for the guiding member 73 as long as it has sufficient mechanical strength to guide the tip end portion M1 of the glass chopped strand mat M. For example, materials such as various plastics, FRP, metals, wood, rubber, glass, etc. may be used singly or in combination.
Among them, plastic and FRP are particularly preferable because they have appropriate strength, light weight, and high formability.

Examples of plastics that can be used include acrylic, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, nylon, polyacetal, polycarbonate, polyphenylene sulfide, polysulfone, polyetherimide, polyetheretherketone, polyimide, and aromatic polyester. However, there is no problem with other plastic materials.

The composition of the glass fibers constituting the glass chopped strand mat M is not particularly limited as long as it exhibits the desired performance, and glass fibers of various compositions can be used.
For example, it may be glass fibers of typical compositions such as E glass, D glass, C glass, AR glass, H glass, or S glass, or may have other compositions.

The winding core 72 is a cylindrical body for winding the glass chopped strand mat M, and is, for example, a paper tube whose structural material is a paper material such as paper tube base paper, kraft paper, or wrapping paper.
The winding core 72 is manufactured in a tubular form by stacking several layers of the base paper on a metallic shaft core called a mandrel and rotating it.

Wrapping paper or wrapping paper is used on the outer peripheral surface 72a of the core 72 for the purpose of decorative finishing.

Further, the core 72 is preferably the above-described paper tube in consideration of economic efficiency, but when emphasizing mechanical strength, it may be made of a material such as plastic or FRP. good too. A detailed configuration of the winding core 72 will be described when the forming method is described below.

[Method for Forming Winding Body R of Glass Chopped Strand Mat M]
A method for forming a roll R of a glass chopped strand mat M according to an embodiment of the present invention is a method for forming a roll R of a strip-shaped glass chopped strand mat M containing glass chopped strands S. The forming method is to roll the glass chopped strand mat M into a roll by bringing at least a portion of the tip portion M1 of the glass chopped strand mat M into contact along the outer peripheral surface 72a of the winding core 72 and rotating the winding core 72. A step of forming a winding body R is provided. The outer peripheral surface 72a of the winding core 72 is formed by applying a resin to the outer peripheral surface 72a to form an adhesive convex portion 75 and a non-adhesive concave portion 76. It is characterized by having an uneven region A.
In this manner, the uneven region A having the projections 75 and the recesses 76 is provided on the outer peripheral surface 72a of the winding core 72, and the tip portion M1 of the glass chopped strand mat M or the vicinity of the tip portion M1 is the uneven region A of the winding core 72. By adhering the glass chopped strand mat M to the projections 75 of , the glass chopped strand mat M can be reliably wound, and a wound body R having a good winding shape can be efficiently produced. More specifically, the uneven area A is composed of sticky protrusions 75 and non-adhesive recesses 76. At or near the tip of the glass chopped strand mat M, the uneven area A has a Since there are adhesive portions and non-adhesive portions, when the glass chopped strand mat M is pulled out from the winding body R of the glass chopped strand mat M and used up, the pulled glass chopped strand mat M is pulled. Even if it is broken, the glass chopped strand mat M is easily separated from the core 72 compared to the case where the tip of the glass chopped strand mat M or the entire vicinity of the tip is adhered to the core 72. can prevent damage from occurring.

The convex portion 75 is formed by applying a predetermined resin (hot-melt resin in this embodiment) to the outer peripheral surface 72a of the winding core 72 . In this embodiment, as shown in FIG. 7, the convex portion 75 is composed of a plurality of circles or polygons defined by contour lines r.
In this way, the protrusions 75 are configured by a plurality of circles or polygons formed by the outline r, so that the protrusions 75 having stickiness and the recesses 76 having no stickiness are formed. It can be easily formed in any region of the outer peripheral surface 72a of the winding core 72 .

Hot-melt resins include, for example, ethylene-vinyl acetate copolymer (EVA)-based, polyamide-based, polyurethane-based, and polyolefin-based hot-melt resins.
In this embodiment, by using a hot-melt resin, the protrusions 75 can be easily formed because the hot-melt resin is solidified when the temperature reaches normal temperature after application.

In addition, as a preferable physical property as a hot-melt resin, a test substrate in which the hot-melt resin is coated on the whole and laminated has a sliding tilt angle of 40 measured in accordance with the tilt method of JIS P 8147 (2010). degree or higher.
That is, when the sliding inclination angle is 40 degrees or more, the glass chopped strand mat M can be easily caught by the projections 75 when it contacts the outer peripheral surface 72 a of the core 72 .
On the other hand, if the sliding inclination angle is less than 40 degrees, even when the glass chopped strand mat M contacts the outer peripheral surface 72a of the winding core 72, the protrusions 75 are not stably caught.

[Evaluation method based on the slope method of JIS P 8147 (2010)]
A prescribed hot-melt resin is heated and melted, and is applied at a prescribed coating temperature to one of two standard corrugated boards, which are examples of test substrates. After applying the hot-melt resin, after 150 seconds of open time (curing time), standard corrugated cardboard is stacked, and a predetermined load (for example, 3 kg) is applied and held at room temperature for 1 minute, and the stacked corrugated cardboard is gradually removed. Make an incline and measure the angle (sliding inclination angle) when it slides down (when the top and bottom cardboards are displaced). When the glass chopped strand mat M is reliably wound around the winding core 72, the stability is poor, and wrinkles and slippage occur. Even if the glass chopped strand mat M is wound around the winding core 72, the glass chopped strand mat M is not adhered to the projections 75 of the winding core 72 at the initial stage of winding, and the winding core 72 idles, causing the glass chopped strand mat M to slack. In order to eliminate the slack, it is wound or wrinkled, or it is torn due to the winding misalignment.

Further, if the band width h in the direction along the outer peripheral surface of the uneven area A shown in FIG. It becomes possible to stick to 75.

If the band width h in the direction along the outer peripheral surface of the uneven region A is less than 20 mm, a sufficient hot-melt resin band cannot be formed on the surface of the winding core 72, and sufficient adhesive strength cannot be exhibited. The glass chopped strand mat cannot be stably wound up. On the other hand, if the band width h in the direction along the outer peripheral surface of the uneven region A is longer than 50 mm, the hot-melt resin band formed on the surface of the winding core 72 has an increased convex portion, resulting in a glass chopped strand mat after winding. is likely to stick to the winding core 72, increasing the risk of wrinkles and tearing.

The band width h in the direction along the outer peripheral surface of the uneven region A is preferably within the range of 22 to 48 mm, more preferably within the range of 25 to 46 mm.

In addition, if 3.5 to 15 circles or polygons are included per 20 mm in the rotation axis direction of the uneven area A, the tip portion M1 of the glass chopped strand mat M can be stably protruded into the uneven area A. It becomes possible to make it adhere to the part 75 .
Here, as shown in FIG. 9, two contour lines r (shown thick in FIG. 9) are formed in one circle substantially parallel to the short side direction. Therefore, the number of contour lines r substantially parallel to the short side direction is 7 to 30, which is twice the number of circles or polygons, per 20 mm. In FIG. 9, 3.5 circles are included per 20 mm in the rotation axis direction of the concave-convex region A, and seven contour lines r substantially parallel to the short side direction are formed for each circle.

If the number of circles or polygons formed by the contour lines r of the projections 75 is less than 3.5 per 20 mm, a sufficient hot-melt resin zone cannot be formed on the surface of the winding core 72, resulting in insufficient adhesion. Since the force cannot be exerted, the glass chopped strand mat cannot be stably wound up. On the other hand, if there are more than 15 circles or polygons per 20 mm formed by the contour lines r of the projections 75, the number of projections of the hot-melt resin zone formed on the surface of the winding core 72 increases, resulting in The glass chopped strand mat tends to stick to the winding core 72, increasing the risk of wrinkles and tearing.

It should be noted that, in the rotation axis direction of the uneven area A, it is preferable to include a plurality of 5 to 14 circles or polygons per 20 mm.

In addition, the number of intersections p of the protrusions 75 per 20 mm in the rotation axis direction of the uneven region A is 40 to 300, and the number of intersections where four or more circles or polygons overlap at one point is 0. If so, it is possible to stably adhere the tip end portion M1 of the glass chopped strand mat M to the convex portion 75 of the uneven region A. As shown in FIG. 10, the intersection points p of the circles or polygons are points at which adjacent or close circles intersect. In FIG. 10, there are 52 intersection points p. All the intersections p shown in FIG. 10 are formed by the overlap of two circle outlines r. In addition, in the present embodiment, the contour lines r of two or three circles may overlap.

If the number of intersection points p of the protrusions 75 per 20 mm in the rotation axis direction of the uneven region A is less than 40, a sufficient hot-melt resin zone cannot be formed on the surface of the winding core 72. Since sufficient adhesion cannot be exhibited, the glass chopped strand mat cannot be stably wound up. On the other hand, if the number of intersection points p of the protrusions 75 per 20 mm in the rotation axis direction of the uneven area A is more than 300, the protrusions 75 of the hot-melt resin zone formed on the surface of the winding core 72 The amount of resin increases, and the glass chopped strand mat after being wound tends to stick to the winding core 72, increasing the risk of wrinkles and tearing. Also, if there is an intersection point where four or more circles or polygons overlap at one point, the amount of resin at the intersection point increases, and the glass chopped strand mat after winding tends to stick to the winding core 72, causing wrinkles and tearing. increased risk of occurrence.

In addition, the number of intersection points p of the convex portions 75 per 20 mm in the rotation axis direction of the uneven area A is 50 to 290, and the number of intersection points p where four or more circles or polygons overlap at one point. is preferably 0, the number of intersection points p of the convex portions 75 per 20 mm in the rotation axis direction of the uneven region A is 70 to 280, and 4 or more circles or polygons are 1 point It is more preferable that the number of intersections p overlapping with is zero.

Further, if the average height difference between the convex portions 75 and the concave portions 76 is 50 to 250 μm and the average line width of the contour line r is 50 to 500 μm, the tip portion M1 of the glass chopped strand mat M is stabilized. As a result, it becomes possible to adhere to the protrusions 75 of the uneven area A. As shown in FIG.

When the average height difference between the convex portion 75 and the concave portion 76 is less than 50 μm, the amount of resin in the convex portion 75 is small. Therefore, a sufficient hot-melt resin zone cannot be formed on the surface of the winding core 72, and sufficient adhesive force cannot be exerted, so that the glass chopped strand mat cannot be stably wound up. On the other hand, when the average height difference between the projections 75 and the recesses 76 is greater than 250 μm, the amount of resin at the projections 75 in the hot-melt resin zone formed on the surface of the winding core 72 increases, and the glass after winding increases. The chopped strand mat tends to stick to the winding core 72, increasing the risk of wrinkles and tearing.

Also, when the average value of the line width of the contour line r is less than 50 μm, the amount of resin in the convex portion 75 is small. Therefore, a sufficient hot-melt resin zone cannot be formed on the surface of the winding core 72, and sufficient adhesive force cannot be exerted, so that the glass chopped strand mat cannot be stably wound up. On the other hand, when the average value of the line width of the contour line r is larger than 500 μm, the amount of resin in the convex portions 75 of the hot-melt resin zone formed on the surface of the winding core 72 increases, and the glass chopped strand mat after winding increases. is likely to stick to the winding core 72, increasing the risk of wrinkles and tearing.

The average height difference between the projections 75 and the recesses 76 is preferably 55 to 240 μm, more preferably 80 to 200 μm. Furthermore, the average line width of the contour r is preferably 60 to 470 μm, more preferably 70 to 450 μm.

In addition, if the arrangement interval d in the outer peripheral surface direction of the plurality of uneven regions A is in the range of L/12 to L/4, where L is the diameter of the core 72, the tip of the glass chopped strand mat M It is possible to stably adhere M1 to the protrusions 75 of the uneven area A. As shown in FIG. 11, when four uneven regions A are provided at both ends in the radial direction of the outer peripheral surface 72a of the winding core 72, there are four arrangement intervals d. The arrangement interval d is preferably within the range of L/12 to L/4.

If the arrangement interval d of the uneven regions A in the outer peripheral surface direction is less than L/12, the uneven regions A overlap each other, and there is a risk that the height difference between the convex portions 75 and the concave portions 76 in the hot-melt resin zone increases. On the other hand, if the arrangement interval d of the uneven region A in the direction of the outer peripheral surface is larger than L/4, the portion where the hot-melt resin zone is not formed on the surface of the winding core 72 becomes large, and sufficient adhesive strength cannot be exhibited. The glass chopped strand mat cannot be stably wound up.

It should be noted that the arrangement interval d of the plurality of uneven regions A in the direction of the outer peripheral surface is preferably in the range of L/10 to L/5, where L is the diameter of the winding core 72 .

Further, if the diameter L of the winding core 72 is 80 to 150 mm, a sufficient area can be secured for the projections 75 of the uneven region A, so that the tip M1 of the glass chopped strand mat M or the vicinity of the tip of the winding core 72 It is preferable because the glass chopped strand mat M can be reliably wound up by adhering it to the protrusions 75 of the uneven area A.

If the diameter of the winding core 72 is smaller than 80 mm, the area of the portion where the tip end portion M1 of the glass chopped strand mat M is attached in the initial stage of winding is not sufficiently large. can be limited. Therefore, the glass chopped strand mat cannot be stably wound up because sufficient adhesive strength cannot be exerted. On the other hand, if the diameter of the winding core 72 is larger than 150 mm, the portion where the projections 75 need to be formed becomes large, which may increase the cost.

Therefore, it is more preferable that the diameter L of the winding core 72 is 100 to 130 mm.

Further, if the occupied area of the uneven area A with respect to the outer peripheral surface of the winding core 72 is 20 to 60%, it is possible to stably adhere the tip portion M1 of the glass chopped strand mat M to the convex portion 75 of the uneven area A. Therefore, it is preferable. As shown in FIG. 11, when four uneven areas A are provided at both ends in the radial direction of the outer peripheral surface 72a of the winding core 72, it is preferable that the total exclusive area of the respective uneven areas A is 20 to 60%. . In addition, in this embodiment, the band width h of the uneven area A is provided with different widths. The band width h of the uneven region A is not limited to this, and the four band widths may have the same width.

If the uneven area A occupies less than 20% of the outer peripheral surface of the winding core 72, the area where the hot-melt resin zone is not formed on the surface of the winding core 72 becomes large, and sufficient adhesive strength cannot be exhibited. The glass chopped strand mat cannot be stably wound up. On the other hand, if the occupied area of the uneven regions A with respect to the outer peripheral surface of the winding core 72 is more than 60%, the uneven regions A overlap each other, and there is a risk that the difference in height between the protrusions 75 and the recesses 76 in the hot-melt resin zone becomes large.

Therefore, it is more preferable that the uneven area A occupy 25 to 55% of the outer peripheral surface of the winding core 72 .

Further, when the convex portion 75 is composed of a plurality of circles formed by contour lines r, the circle formed by the contour lines r is expressed as x ² /a ² +y ² /b ² =1 a is the elliptical radius in the same direction as the long side direction of the winding core 72, b is the elliptical radius in the same direction as the short side direction of the winding core 72), the constants a and b are in the range of 10 to 25, and b is a If it is larger, it becomes possible to make the tip portion M1 of the glass chopped strand mat M stably stick to the convex portion 75 of the concave-convex region A. That is, the circle forming the projection 75 is an ellipse, and it is preferable that the diameter parallel to the axial direction of the winding core 72 is shorter than the diameter parallel to the winding direction of the winding core 72 .

If the constants a and b are out of the range of 10 to 25, the minor axis of the ellipse becomes narrow, the uneven regions A overlap each other, and there is a risk that the height difference between the convex portions 75 and the concave portions 76 in the hot-melt resin zone increases. occurs.

Therefore, when the circle formed from the contour r is expressed as x ² /a ² +y ² /b ² =1, a is the elliptical radius in the same direction as the long side direction of the core 72, and b is the short elliptical radius in the same direction as the side direction), constants a and b are in the range of 12 to 23, and b is preferably larger than a.

In another embodiment, as shown in FIG. 12, the convex portion 75 is configured by a spiral extending in the axial direction of the winding core 72 configured by the outline r.
In this way, the protrusions 75 are configured by spirals extending in the axial direction of the winding core 72 formed by the outline r, so that the unevenness formed by the protrusions 75 having adhesiveness and the recesses 76 having no adhesiveness is formed. The region A can be easily formed in any region of the outer peripheral surface 72a of the winding core 72 .

[Evaluation of winding state of wound body]
Using the winding device 70 described above, the glass chopped strand mat M is wound while changing the forming conditions of the uneven region A, thereby producing the wound body R of the glass chopped strand mat M shown in the following examples and comparative examples. bottom.

[Examples and Comparative Examples]
(Example 1)
Core width: 1.44 m, core inner diameter: 102 mm, core thickness: 2.3 mm Polypropylene resin (PP) with a sliding inclination angle of 45 degrees over the entire width of the core made of paper. was spirally applied and cured to form an uneven region A. In addition, four uneven regions A were provided at both ends in the radial direction of the outer peripheral surface of the winding core.

Using this winding core 72, a glass chopped strand mat M having a mat basis weight of 107 g/m ² and a width of 1.44 m was wound at a mat winding speed of 40 m/min to prepare a wound body.

In Example 1, the band width h in the short side direction of the uneven region A is in the range of 31 to 45 mm, the number of spirals forming the band of the uneven region A is 11/20 mm, the number of intersections p is 210, The average value of the height difference between the convex portion 75 and the concave portion 76 is 98 μm, the line width of the contour line r is 75 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/9 to L/6. A body R was produced. There was no intersection point where four or more contour lines overlapped at one point.

(Examples 2-7)
For Examples 2 to 7, the band width h in the short side direction of the uneven region A, the number of spirals forming the band of the uneven region A, the number of intersections p, the average height difference between the convex portions 75 and the concave portions 76, A wound body R was produced by changing the line width of the contour line r and the arrangement interval d of the four bands in the outer peripheral surface direction so as to meet the conditions described below. The wound body R was produced under the same conditions as in Example 1 with respect to other conditions.

(Example 2)
In Example 2, the band width h in the short side direction of the uneven region A is in the range of 28 to 43 mm, the number of spirals forming the band of the uneven region A is 5/20 mm, the number of intersection points p is 90, The average value of the height difference between the convex portion 75 and the concave portion 76 is 157 μm, the line width of the contour line r is 136 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/11 to L/4. A body R was produced. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Example 3)
In Example 3, the band width h in the short side direction of the uneven region A is in the range of 30 to 46 mm, the number of spirals forming the band of the uneven region A is 11.5/20 mm, and the number of intersection points p is 156. 140 μm, the line width of the contour line r is 185 μm, and the arrangement interval d of the four bands in the outer peripheral direction is in the range of L/10.7 to L/4. A wound body R was produced as the inside. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Example 4)
In Example 4, the band width h in the short side direction of the uneven region A is in the range of 39 to 47 mm, the number of spirals forming the band of the uneven region A is 14/20 mm, the number of intersections p is 140, Assuming that the average height difference between the convex portion 75 and the concave portion 76 is 190 μm, the line width of the contour line r is 320 μm, and the arrangement interval d of the four bands in the outer peripheral direction is within the range of L/8 to L/5.3. A wound body R was produced. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Example 5)
In Example 5, the band width h in the short side direction of the uneven region A is in the range of 35 to 44 mm, the number of spirals forming the band of the uneven region A is 8/20 mm, the number of intersections p is 280, Assuming that the average height difference between the convex portion 75 and the concave portion 76 is 65 μm, the line width of the contour line r is 450 μm, and the arrangement interval d of the four bands in the outer peripheral direction is within the range of L/10.7 to L/4. A wound body R was produced. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Example 6)
In Example 6, the band width h in the short side direction of the uneven region A is in the range of 35 to 46 mm, the number of spirals forming the band of the uneven region A is 9/20 mm, the number of intersections p is 105, The average height difference between the convex portion 75 and the concave portion 76 is 105 μm, the line width of the contour line r is 310 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/10.7 to L/5.3. A wound body R was produced as the inside. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Example 7)
In Example 7, the band width h in the short side direction of the uneven region A is in the range of 25 to 43 mm, the number of spirals forming the band of the uneven region A is 13/20 mm, the number of intersection points p is 75, The average height difference between the convex portion 75 and the concave portion 76 is 240 μm, the line width of the contour line r is 130 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/10.7 to L/5.3. A wound body R was produced as the inside. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative example 1)
In Comparative Example 1, the band width h in the short side direction of the uneven region A is in the range of 10 to 55 mm, the number of spirals forming the band of the uneven region A is 7.5/20 mm, and the number of intersections p is 240. , the average value of the difference in height between the convex portion 75 and the concave portion 76 is 180 μm, the line width of the contour line r is 285 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is within the range of L/9 to L/4. A wound body R was produced. That is, in Comparative Example 1, the width of the band in the short side direction is not in the range of 20 to 50 mm. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative example 2)
In Comparative Example 2, the band width h in the short side direction of the uneven region A is in the range of 25 to 44 mm, the number of spirals forming the band of the uneven region A is 18/20 mm, the number of intersection points p is 240, The average value of the height difference between the convex portion 75 and the concave portion 76 is 175 μm, the line width of the contour line r is 110 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/11 to L/4. A body R was produced. That is, in Comparative Example 2, the number of spirals forming the band of the uneven region A is more than 15. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative Example 3)
For Comparative Example 3, the band width h in the short side direction of the uneven region A is in the range of 28 to 41 mm, the number of spirals forming the band of the uneven region A is 10/20 mm, the number of intersection points p is 315, Assuming that the average value of the height difference between the convex portion 75 and the concave portion 76 is 150 μm, the line width of the contour line r is 310 μm, and the arrangement interval d of the four bands in the outer peripheral direction is within the range of L/11 to L/5.3. A wound body R was produced. That is, in Comparative Example 3, the number of intersection points p is more than 300. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative Example 4)
In Comparative Example 4, the band width h in the short side direction of the uneven region A is in the range of 35 to 40 mm, the number of spirals forming the band of the uneven region A is 10.5/20 mm, and the number of intersections p is 80. , the average height difference between the convex portion 75 and the concave portion 76 is 138 μm, the line width of the contour line r is 106 μm, and the arrangement interval d of the four bands in the outer peripheral direction is within the range of L/12 to L/4. A wound body R was produced. Further, in Comparative Example 4, four or more contour lines r overlap at the intersections. Other conditions were the same as in Example 1 to produce a wound body.

(Comparative Example 5)
In Comparative Example 5, the band width h in the short side direction of the uneven region A is in the range of 38 to 46 mm, the number of spirals forming the band of the uneven region A is 8.5/20 mm, and the number of intersections p is 272. 280 μm, the line width of the contour line r is 145 μm, and the arrangement interval d of the four bands in the outer peripheral direction is in the range of L/10.7 to L/4. A wound body R was produced as the inside. That is, in Comparative Example 5, the average height difference between the convex portion 75 and the concave portion 76 is greater than 250 μm. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative Example 6)
In Comparative Example 6, the band width h in the short side direction of the uneven region A is in the range of 30 to 45 mm, the number of spirals forming the band of the uneven region A is 9/20 mm, the number of intersection points p is 160, The average value of the height difference between the convex portion 75 and the concave portion 76 is 205 μm, the line width of the contour line r is 540 μm, and the arrangement interval d of the four bands in the outer peripheral surface direction is in the range of L/10.7 to L/1.3. A wound body R was produced as the inside. That is, in Comparative Example 6, the line width of the contour line r is greater than 500 μm. Also, the arrangement interval d of the four bands in the direction of the outer peripheral surface is not within the range of L/12 to L/4. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

(Comparative Example 7)
In Comparative Example 7, the band width h in the short side direction of the uneven region A is in the range of 34 to 46 mm, the number of spirals forming the band of the uneven region A is 5.5/20 mm, and the number of intersections p is 110. 132 μm, the line width of the contour line r is 75 μm, and the arrangement interval d of the four bands in the outer peripheral direction is in the range of L/36 to L/5.3. A wound body R was produced as the inside. That is, in Comparative Example 7, the arrangement interval d of the four bands in the outer circumferential direction is not within the range of L/12 to L/4. Other conditions were the same as in Example 1 to produce a wound body. There was no intersection point where four or more contour lines overlapped at one point.

[Evaluation results]
As an evaluation criterion, the winding state of the wound body of the glass chopped strand mat was evaluated by the length of wrinkles when the mat was pulled out. That is, for the winding core 72, when the surface of the winding core 72 does not exhibit sufficient adhesive strength, sagging occurs during winding, or when the glass chopped strand mat after winding tends to stick to the winding core 72. The occurrence of slippage was evaluated by the length of wrinkles. The wrinkle length was calculated by measuring the number and length of wrinkles generated from the start of winding to a predetermined length, and dividing the total length of wrinkles by the number of wrinkles.

Here, the winding start is the point of contact between the glass chopped strand mat M and the winding core 72 . The predetermined length shall be 10m. The length of wrinkles is Lt/n, where n is the number of wrinkles and Lt (m) is the total wrinkle length.

The results shown in Table 1 were obtained for Examples 1 to 7.

The results shown in Table 2 were obtained for Comparative Examples 1 to 7.

In Examples 1 to 7, the wrinkle length was 1.3 or less. On the other hand, in the comparative examples, the wrinkle length was 1.9 or more. Therefore, by adhering the front end portion M1 or the vicinity of the front end portion M1 of the glass chopped strand mat M to the convex portion 75 of the uneven area A of the winding core 72 under the conditions of Examples 1 to 7, the glass chopped strand mat M can be securely attached. It is possible to wind up the body to a high degree, and the wound body R having a good winding shape can be efficiently produced.

The present invention can be applied to a method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands and a roll of a strip-shaped glass chopped strand mat.

70 Winding device 72 Winding core 72a Peripheral surface 75 Protruding part 76 Concave part A Concavo-convex area S Glass chopped strand M Glass chopped strand mat M1 Tip part R Winding body d Arrangement interval h Band width p Intersection r Outline line

Claims

A method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands, comprising:
At least part of the tip of the glass chopped strand mat is brought into contact with the outer peripheral surface of the winding core and the winding core is rotated to wind the glass chopped strand mat into a roll to form a wound body. Equipped with a process,
The outer peripheral surface of the winding core has a convex portion having adhesiveness and a concave portion having no adhesiveness, and extends along the rotation axis direction of the winding core, and the range in which the convex portion and the concave portion are provided A plurality of strip-shaped uneven regions having a width in the direction along the outer peripheral surface including
The width is within the range of 20 to 50 mm,
The convex portion is configured by a plurality of circles or polygons configured by outlines,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the outer peripheral surface direction is in the range of L/12 to L/4, where L is the diameter of the winding core.
A method for forming a roll of a glass chopped strand mat, characterized by:
A method for forming a roll of a strip-shaped glass chopped strand mat containing glass chopped strands, comprising:
At least part of the tip of the glass chopped strand mat is brought into contact with the outer peripheral surface of the winding core and the winding core is rotated to wind the glass chopped strand mat into a roll to form a wound body. Equipped with a process,
The outer peripheral surface of the winding core has a convex portion having adhesiveness and a concave portion having no adhesiveness, and extends along the rotation axis direction of the winding core, and the range in which the convex portion and the concave portion are provided A plurality of strip-shaped uneven regions having a width in the direction along the outer peripheral surface including
The width is within the range of 20 to 50 mm,
The convex portion is configured by a spiral extending in the axial direction of the winding core, which is configured by a contour line,
Including 3.5 to 15 spiral circles per 20 mm in the rotation axis direction of the uneven region,
In the rotation axis direction of the uneven region, the number of intersections of the convex portions per 20 mm is 40 to 300, and the number of intersections where four or more of the contour lines overlap at one point is 0,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the outer peripheral surface direction is in the range of L/12 to L/4, where L is the diameter of the winding core.
A method for forming a roll of a glass chopped strand mat, characterized by:
The occupied area of the uneven region with respect to the outer peripheral surface of the winding core is 20 to 60%.
3. The method for forming a wound body according to claim 1 or 2, characterized in that:
The winding core has a diameter L of 80 to 150 mm,
3. The method of forming a wound body according to claim 1 or 2, characterized in that:
A wound body of a glass chopped strand mat having a winding core and a rolled glass chopped strand wound around the winding core,
An uneven region is formed on the outer peripheral surface of the winding core, and the convex portion of the uneven region has adhesiveness,
A plurality of strip-shaped uneven regions extending along the rotation axis direction of the winding core and having a width in the direction along the outer peripheral surface including the range where the protrusions and recesses are provided are formed,
The width is within the range of 20 to 50 mm,
The convex portion is configured by a plurality of circles or polygons configured by outlines,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the outer peripheral surface direction is in the range of L/12 to L/4, where L is the diameter of the winding core.
A wound body of a glass chopped strand mat characterized by:
A wound body of a glass chopped strand mat having a winding core and a rolled glass chopped strand wound around the winding core,
An uneven region is formed on the outer peripheral surface of the winding core, and the convex portion of the uneven region has adhesiveness,
A plurality of strip-shaped uneven regions extending along the rotation axis direction of the winding core and having a width in the direction along the outer peripheral surface including the range where the protrusions and recesses are provided are formed,
The width is within the range of 20 to 50 mm,
The convex portion is configured by a spiral extending in the axial direction of the winding core, which is configured by a contour line,
Including 3.5 to 15 of the circles or polygons per 20 mm in the direction of the rotation axis of the uneven region,
The number of intersections of the protrusions per 20 mm in the rotation axis direction of the uneven region is 40 to 300, and the number of intersections where four or more of the circles or polygons overlap at one point is 0. can be,
The average value of the height difference between the convex portion and the concave portion is 50 to 250 μm, and the average value of the line width of the contour line is 50 to 500 μm,
The distance between the plurality of uneven regions in the outer peripheral surface direction is in the range of L/12 to L/4, where L is the diameter of the winding core.
A wound body of a glass chopped strand mat characterized by:
The convex portion is composed of a plurality of circles formed by outlines,
When the circle formed from the outline is expressed as x 2 /a 2 +y 2 /b 2 = 1 (a is the elliptical radius in the same direction as the long side direction of the core, b is the short side direction of the core) elliptical radii in the same direction), the constants a and b are in the range of 10 to 25, and b is greater than a;
7. The roll of glass chopped strand mat according to claim 5 or 6, characterized in that: