JP2018203464A - Method of manufacturing wound body of glass chopped strand mat and wound body of glass chopped strand mat - Google Patents

Abstract

To provide a method of manufacturing a wound body of a glass chopped strand mat, and a wound body of a glass chopped strand mat, capable of suppressing an occurrence of winding deviation and wrinkle during its manufacture.SOLUTION: The method for manufacturing a wound body of a glass chopped strand mat M including a glass chopped strand S, includes a step of winding the glass chopped strand mat M in a roll shape to form a wound body by bringing a tip end portion M1 of the glass chopped strand mat M into contact with the outer peripheral surface of a winding core 72 and rotating the winding core 72, in which a coefficient of kinetic friction measured on the outer peripheral surface of the glass chopped strand mat M and the winding core 72 in accordance with the method defined in JIS K 7125 (1999) is 0.25 to 0.35 and basis weight of the glass chopped strand mat M is 70 g/mor more and 250 g/mor less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a wound body of a glass chopped strand mat, in which a glass chopped strand mat is wound around a core to produce a wound body, and a wound body of a glass chopped strand mat.

Conventionally, a glass chopped strand mat formed by forming a cut glass fiber (hereinafter referred to as a glass chopped strand) into a mat shape is known.
The glass chopped strand mat is usually cut into a strip shape by a slitter device and then wound around a paper core, and is obtained as a roll of a glass chopped strand mat having a roll as an axis.
In the process of finishing such a glass chopped strand mat into a wound body, in order to wind the glass chopped strand mat around the winding core, a member for joining the winding core and the glass chopped strand mat is not used. A manufacturing method is known in which the tip of a glass chopped strand mat is directly wound up (see, for example, Patent Document 1).

JP 2009-154996 A

  Here, in the manufacturing method disclosed in Patent Document 1, it is preferable to set the rotational speed of the winding core when winding the tip of the glass chopped strand mat as fast as possible from the viewpoint of production efficiency.

However, the higher the rotation speed of the winding core, the more difficult it becomes to wind the glass chopped strand mat around the winding core. Deviation easily occurs between the lead and the core.
As a result, the glass chopped strand mat may be wound in a state where it protrudes outward from the end of the core (winding misalignment state), or the glass chopped strand mat may be wrinkled, which is a major technology in terms of quality and production efficiency. It was an issue.

  The present invention has been made in view of such a current problem, and at the time of manufacturing a wound body of a glass chopped strand mat, the winding of the glass chopped strand mat that can suppress the occurrence of winding displacement and wrinkles. An object of the present invention is to provide a method for producing a body and a wound body of a glass chopped strand mat.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

A method for producing a wound body of a glass chopped strand mat according to the present invention is a method for producing a wound body of a glass chopped strand mat including a glass chopped strand, wherein at least a part of a tip portion of the glass chopped strand mat is provided. In the step of winding the glass chopped strand mat into a roll to form a wound body by bringing the core into contact with the outer peripheral surface of the core and rotating the core, the glass chopped strand mat and the core The dynamic friction coefficient measured in accordance with the method defined in JIS K 7125 (1999) on the outer peripheral surface of 0.25 to 0.35, and the basis weight of the glass chopped strand mat is 70 g / m ² or more and 250 g. / M ² or less.

  According to such a configuration, the tip of the glass chopped strand mat can be directly wound around the core to reliably form a wound body, and the occurrence of winding deviation and wrinkles of the glass chopped strand mat is suppressed. Winding bodies with good winding shape can be produced efficiently.

  Moreover, it is preferable that the manufacturing method of the winding body of the glass chopped strand mat which concerns on this invention is content of the said binder in the said glass chopped strand mat being 5.0-13.0 mass%.

  That is, when the binder is less than 5.0% by mass, the effect as the binder cannot be exhibited, and wrinkles are likely to occur because the rigidity of the glass chopped strand mud is lowered. On the other hand, when the binder exceeds 13.0% by mass, it becomes slippery with respect to the outer peripheral surface of the core, so that it is difficult to stably wind the core around the core. For this reason, when the content of the binder is 5.0 to 13.0% by mass, the glass chopped strand mat can be wound around the core in a more stable state.

  Moreover, it is preferable that the manufacturing method of the winding body of the glass chopped strand mat which concerns on this invention is 10 m / min-150 m / min in the conveyance speed of the said glass chopped strand mat by the said core.

  That is, when the conveyance speed is less than 10 m / min, the production efficiency is not improved in mass production, which is not economical. On the other hand, when the conveyance speed exceeds 150 m / min, even if the glass chopped strand mat comes into contact with the outer peripheral surface of the core, it is not caught up following the rotation of the core. Therefore, if the conveying speed of the glass chopped strand mat is 10 m / min to 150 m / min, the glass chopped strand mat can be effectively wound around the core without drastically reducing the production efficiency. it can.

  Moreover, it is preferable that the outer diameter size of the said core is 50-150 mm as for the manufacturing method of the winding body of the glass chopped strand mat which concerns on this invention.

  That is, when the outer diameter of the winding core is less than 50 mm, it is difficult to guide the glass chopped strand mat to the outer peripheral surface of the winding core without wrinkles or winding deviation as the winding speed of the glass chopped strand increases. Thus, if the outer diameter of the core exceeds 150 mm, the bulk of the core itself increases and the handling of the wound body deteriorates. Therefore, when the outer diameter of the core is 50 to 150 mm, the glass chopped strand mat can be effectively wound around the core without deteriorating the winding efficiency and handling of the wound body. Can do.

  Moreover, it is preferable that the raw material of the outer peripheral surface of the said core is a kraft paper in the manufacturing method of the winding body of the glass chopped strand mat which concerns on this invention.

  By having such a configuration, a desired dynamic friction coefficient can be obtained, so that the occurrence of winding deviation and wrinkles of the glass chopped strand mat can be suppressed.

  Further, the method of manufacturing a wound body of the glass chopped strand mat according to the present invention includes a step of depositing glass chopped strands on the belt of a conveyor having a belt, and a method of binding the glass chopped strands on the belt. A step of applying a binder, a step of heating and melting the binder on the belt, a step of cooling the glass chopped strand having the heat-melted binder and curing the binder. And a step of forming the wound body, and a method for producing a wound body of a glass chopped strand mat.

  According to such a configuration, in the step of forming the wound body, the tip of the glass chopped strand mat can be directly wound around the winding core to reliably form the wound body. A winding body with a good winding shape that suppresses the occurrence of winding deviation and wrinkles can be produced efficiently. Moreover, since manufacture of a glass chopped strand mat and manufacture of a wound body are performed together, a wound body can be manufactured efficiently.

Further, the wound body of the glass chopped strand mat 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, The dynamic coefficient of friction measured according to the method defined in JIS K 7125 (1999) on the outer peripheral surface of the glass chopped strand mat and the core is 0.25 to 0.35, and the basis weight of the glass chopped strand mat It is characterized by being a wound body of a glass chopped strand mat, characterized in that it is 70 g / m ² or more and 250 g / m ² or less.

  According to such a structure, the winding body of the glass chopped strand mat which suppressed generation | occurrence | production of winding shift | offset | difference and a wrinkle can be provided.

  As effects of the present invention, the following effects can be obtained.

According to the method for producing a wound body of a glass chopped strand mat according to the present invention, the front end portion of the glass chopped strand mat is directly wound without using a member that joins the core and the front end portion of the glass chopped strand mat. It is possible to reliably form a wound body by winding it around a core, and to efficiently produce a wound body with a good winding shape in which the occurrence of winding deviation and wrinkles of the glass chopped strand mat is suppressed.
Moreover, according to the wound body of the glass chopped strand mat which concerns on this invention, the wound body of the glass chopped strand mat which suppressed generation | occurrence | production of the winding gap and wrinkle of a glass chopped strand mat can be provided.

The schematic diagram which shows the whole structure of the manufacturing apparatus of the glass chopped strand mat which implement | achieves the manufacturing method of the winding body of the glass chopped strand mat which concerns on one Embodiment of this invention. Similarly, it is operation | movement explanatory drawing of the manufacturing apparatus of a glass chopped strand mat, Comprising: (a) is a figure which shows the initial stage of winding, (b) is a figure which shows the state in which the glass chopped strand mat is being wound along the induction | guidance | derivation member (C) is a figure which shows the state which the glass chopped strand mat made the round of a winding core, (d) is the direction where the distance from a winding cylinder becomes larger than the outer peripheral position of the winding body at the time of a guidance member full winding. The figure which shows the state after evacuating, (e) is a figure which shows the wound body when the glass chopped strand mat is fully wound.

  Next, embodiments of the invention will be described.

[Overall Configuration of Manufacturing Apparatus 1]
First, the whole structure of the manufacturing apparatus 1 of the glass chopped strand mat M which embodies the manufacturing method of the glass chopped strand mat which concerns on one Embodiment of this invention is demonstrated using FIG.
The production apparatus 1 is an apparatus for producing a glass chopped strand mat M from a glass cake C, and includes a cutting machine 10, a conveyor 20, a binder applying device 30, a heating furnace 40, a cold pressure roll 50, and a winding. The apparatus 70 etc. are provided.

  The cutting machine 10 is an apparatus for generating chopped strands S from glass fibers F wound around a glass cake C, and includes a cutter roller 11 and a rubber roller 12 that are arranged to face each other.

  And in the cutting machine 10, the glass fiber F is continuously cut | disconnected by supplying the glass fiber F pulled out from the glass cake C between the rotating cutter roller 11 and the rubber roller 12, and the glass chopped strand S Can be continuously generated.

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 strand S is less than 10 mm, a large amount of binder is required to produce a glass chopped strand mat, and it becomes slippery with respect to the outer peripheral surface of the core, so that the core can be stably supplied. It becomes difficult to wind. When the length of the glass chopped strand S exceeds 100 mm, the surface of the glass chopped strand mat becomes rough, and as a result, the coefficient of dynamic friction becomes large and winding is likely to be difficult.
From the above viewpoint, the length of the glass chopped strand 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 conveyor 20 is a device for horizontally conveying the glass chopped strands S · S generated by the cutting machine 10, and includes a first conveyor 21, a second conveyor 22, and a third conveyor 23. Has been.
Moreover, the conveyance conveyor 20 is the order of the 1st conveyor 21, the 2nd conveyor 22, and the 3rd conveyor 23 from an upstream in the conveyance direction (direction of the arrow A shown in FIG. 1) of glass chopped strand SS. Are arranged continuously.

  Each of the conveyors 21, 22, and 23 includes a driving roller and a driven roller, and a conveyance belt B configured by a mesh-like endless belt having an opening diameter smaller than the length of the glass chopped strand S is provided on each roller. It is wound and constitutes a conveyor device.

  Each of the conveyors 21, 22, and 23 is configured such that a driving roller is driven by a motor, and the conveyor belt B is rotationally driven along each roller.

The first conveyor 21 includes a first conveyor belt B <b> 1 and is installed below the cutting machine 10.
The space between the cutting machine 10 and the first conveyor 21 is covered by the chamber 13.

  A suction device (not shown) including a suction duct and a blower is disposed below the first transport belt B1, and transports the chopped strands S distributed and deposited on the first transport belt B1 while sucking them. It is configured to be able to.

  The second conveyor 22 constitutes a part for applying the binder P to the glass chopped strands S · S... While conveying the chopped strands S, and the mesh-like second conveyance belt B 2. It has.

Here, in the manufacturing apparatus 1, the binder application device 30 is disposed above the second conveyor 22.
The binder application device 30 scatters the binder P, which is a resin powder, toward the glass chopped strands S, S,... On the second conveyor belt B2 of the second conveyor 22, and the glass chopped strand S. A device for applying the binder P to S.

As the kind of the binder P, a thermoplastic resin powder is suitable, and for example, a powder polyester resin (for example, New Track (registered trademark) 514, manufactured by Kao Corporation) can be used.
In addition, examples of usable thermoplastic resin powder include resin powders such as nylon, polyethylene, polystyrene, polypropylene, and polyvinyl chloride.

  And the glass chopped strand S on the 2nd conveyor 22 is conveyed to the downstream 3rd conveyor 23 in the state to which the binder P adhered uniformly.

A water sprayer (not shown) may be provided on the upstream side of the binder application device 30.
If the glass chopped strands S are preliminarily wetted with water, the binder P tends to adhere to the surface of the glass chopped strands S due to the action of the surface tension of water. Increase more. As a result, the amount of the binder used can be reduced, the surface of the glass chopped strand mat can be prevented from being slippery, and winding is easily performed.

Moreover, in the manufacturing apparatus 1, the heating furnace 40 is arrange | positioned in the middle of the 3rd conveyor 23 so that 3rd conveyance belt B3 may be enclosed.
In the heating furnace 40, the glass chopped strands S, S,... And the binder P, which enter the heating furnace 40 on the third conveyor belt B3 of the third conveyor 23, are heat-treated, and the binder P is removed. Let it be in a molten state.

  In addition, the atmospheric temperature in the heating furnace 40 is appropriately adjusted so that the temperature is equal to or higher than the melting point of the synthetic resin constituting the binder P to be dispersed.

  In the manufacturing apparatus 1, a cold pressure roll 50 is disposed downstream of the third conveyor 23. The cold pressure roll 50 includes a pair of rollers 51 and 51.

And glass chopped strand S * S ... with which the binder P of the molten state adhered is conveyed to the cold pressure roll 50, and passes between roller 51 * 51.
At this time, the glass chopped strands S, S,... Are cooled and pressed by passing through the cold pressure roll 50, and the glass chopped strands S, S,. A mat-like glass chopped strand mat M made of an adhesive P is formed.

In the manufacturing apparatus 1, the guide member 60 is disposed downstream of the cold pressure roll 50.
The guide member 60 is a plate-like member that guides the glass chopped strand mat M to the winding device 70 that is positioned obliquely below the cold pressure roll 50.

In the manufacturing apparatus 1, a winding device 70 is disposed downstream of the cold pressure roll 50.
The winding device 70 makes the glass chopped strand mat M into a roll shape by bringing at least a part of the tip portion M1 of the glass chopped strand mat M into contact with the outer peripheral surface of the core 72 and rotating the core 72. It is an apparatus for realizing a process of winding and forming a wound body R.

  The winding device 70 includes a pair of rolls 71 and 71 that are driven and rotated in the same direction, a winding core 72 that is rotatably disposed above the upper surface valley between the pair of rolls 71 and 71, a guide member 73, Retraction means (not shown).

  The winding device 70 uses the glass chopped strand mat M supplied from one roll 71 side (upstream side) of the pair of rolls 71 and 71 to drive and rotate the pair of rolls 71 and 71 and the core 72. By winding, the wound body R is wound around the outer peripheral surface of the winding core 72 (see FIG. 2E).

  The guide member 73 includes a guide surface 73a having a curvature along the outer peripheral surface of the core 72 and facing the outer peripheral surface with a space therebetween, and is arranged to be movable in a predetermined direction.

When the glass chopped strand mat M is wound up, the guide member 73 is disposed to face the outer peripheral surface of the core 72 with a predetermined interval.
Further, when the tip portion M1 of the glass chopped strand mat M is wound around the outer peripheral surface of the core 72, the tip portion M1 is wound on the upper layer of the glass chopped strand mat M and the core 72. Is sandwiched between.
And if the front-end | tip part M1 of the glass chopped strand mat M is clamped, the evacuation means will guide the member 73 so that the guide surface 73a may be located outside the outer peripheral position when the winding of the glass chopped strand mat M is completed. Evacuate.

[Operation of Winding Device 70]
Next, a series of operations of the winding device 70 that embodies the manufacturing method of the wound body R of the glass chopped strand mat M according to the embodiment of the present invention will be specifically described with reference to FIG.

  A glass chopped strand mat M formed in a belt shape is conveyed at a predetermined speed by using a conveying means such as a conveyor roller, and a pair of rollers that are driven and rotated in the same direction as shown in FIG. Supplied to the winding device 70 from one side of 71 and 71 (upper left side in the figure).

A winding core 72 is disposed so as to be rotatable about a central axis 74 above the upper surface valley between the pair of rolls 71 and 71, and the tip M <b> 1 of the glass chopped strand mat M is wound around the outer peripheral surface of the roller 71. When entering the gap between the outer peripheral surface of the core 72, the winding core 72 rotates following the driving rotation of the roller 71.
Thereby, the glass chopped strand mat M is wound around the outer periphery of the core 72.

A guide member 73 having a guide surface 73 a is disposed along the core 72 on the radially outer side of the core 72.
The guide surface 73a of the guide member 73 has a curvature along the outer periphery of the core 72, and faces the outer peripheral surface of the core 72 with a predetermined interval.

  The tip M1 of the glass chopped strand mat M that has entered the gap between the roller 71 and the winding core 72 is fed by the drive rotation of the roll 71 and the driven rotation of the winding core 72, and is guided to the outer peripheral surface of the winding core 72. It enters into the space between the member 73 and the guide surface 21a.

  As shown in FIG. 2 (b), the leading end M 1 that has entered the gap portion is guided (guided) along the guide surface 73 a of the guide member 73 and wound around the outer peripheral surface of the core 72. go.

  Thereafter, as shown in FIG. 2 (c), the tip M <b> 1 wraps between the glass chopped strand mat M wound on the upper layer and the core 72 after turning around the outer peripheral surface of the core 72. Is done.

Then, the glass chopped strand mat M is wound several times, and as shown in FIG. 2D, the guide member 73 is driven by a retracting means (not shown), and the guide surface 73a is wound around the glass chopped strand mat M. The core 72 retreats in the radial direction (S direction) so as to be positioned outside the outer peripheral position at the completion of the winding (the outer peripheral position of the wound body when fully wound).
Thereby, the guide surface 73a of the guide member 73 is not hindered when the glass chopped strand mat M is wound.

By such a series of operations, the guide surface 73a of the guide member 73 is smoothly smoothed so that the tip portion M1 of the glass chopped strand mat M is reliably laminated on the outer peripheral surface of the core 72 at the initial winding stage. It is possible to wind it.
Therefore, there is no need to fix the vicinity of the tip portion M1 of the glass chopped strand mat M with a bonding member such as an adhesive, and there is no need to fold the vicinity of the tip portion M1 of the glass chopped strand mat M, as shown in FIG. ) Of the glass chopped strand mat M as shown in FIG.

  The retracting movement of the guide member 73 may be performed after a predetermined time has elapsed in consideration of the rotational speed (= conveying speed) of the winding core 72, or the glass chopped strand wound around the outer circumference of the winding core 72. The thickness of the mat M may be detected by a sensor or the like and performed based on the detected value.

  Moreover, if the moving distance and moving speed of the guide surface 73a of the guide member 73 are values according to the conveying speed of the glass chopped strand mat M and the outer diameter of the wound body R when winding is complete (when fully wound). It is good that the guide surface 73a of the guide member 73 does not hinder the winding operation.

As a material constituting the guiding member 73, any material may be used as long as it can realize a mechanical strength sufficient to guide the tip portion M1 of the glass chopped strand mat M, For example, various plastics, FRP, metal, wood, rubber, glass or other materials may be used alone or in combination.
Of these, plastic and FRP are particularly preferable because they have a certain strength, are lightweight, and have high moldability.

  As the plastic, for example, acrylic, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, nylon, polyacetal, polycarbonate, polyphenylene sulfide, polysulfone, polyetherimide, polyetheretherketone, polyimide, or aromatic polyester may be used. However, there is no problem with other plastic materials.

  Further, in addition to the above, the winding device 70 has a guide surface 73a of the guide member 73 concentric with the outer periphery of the winding core 72 in the cross section perpendicular to the central axis 74 of the winding core 72, and is centered on the central shaft 74. If it has an arc shape in the angle range of 120 ° to 270 °, it is possible to accurately guide the tip portion M1 of the glass chopped strand mat M, and the retracting operation of the guide member 73 described above is performed. Therefore, the guide member 73 can be easily moved.

  If the angle of the guide surface 73a of the guide member 73 is less than 120 °, the tip M1 of the glass chopped strand mat M is wound around the winding core 72 depending on the degree of flexibility of the glass chopped strand mat M and the winding speed. May not be possible.

On the other hand, when the angle is set to 120 ° or more, even if the winding speed is increased, the winding can be performed without any trouble, and the glass chopped strand mat M having a small thickness is not flexible. As a result, an efficient winding operation can be performed.
In addition, when the said angle exceeds 270 degrees, the retraction movement of the guide member 73 may become difficult.

  From the above viewpoint, in order to make the winding operation and the retracting movement of the guide member 73 smoother, the angle of the guide surface 73a is set within an angle range of 100 ° to 250 °. Is preferred.

  Further, in the winding device 70, in addition to the above, the distance between the end portion of the guide surface 73a of the guide member 73 and the outer peripheral surface of the winding core 72 is at least twice as large as the thickness dimension of the glass chopped strand mat M. When the glass chopped strand mat M is wound, the glass chopped strand mat M is wound around the winding core 72 surely and accurately without particularly causing defects such as damage on the surface thereof. This is preferable.

  Here, said space | interval is the shortest distance between the edge part of the guide surface 73a of the guide member 73, and the outer periphery of a winding cylinder.

The thickness dimension of the glass chopped strand mat M varies depending on the type of glass fiber and its use, but has a thickness of 0.05 mm to 10 mm.
Therefore, it is preferable that the above-mentioned interval is about 0.1 mm to about 50 mm.

If the spacing is excessively large, wrinkles may easily occur in the glass chopped strand mat M, and it becomes difficult to obtain a wound body R having a stable quality. On the other hand, if the distance exceeds 5 times the thickness dimension of the glass chopped strand mat M, the guiding function of the guide surface 73a may not be obtained.
Therefore, it is preferable that the above-mentioned interval is in the range of 2 to 5 times the thickness dimension of the glass chopped strand mat M. For example, specific dimensions are in the range from 0.1 mm to 50 mm.

  Moreover, the manufacturing method of the winding body of the glass chopped strand mat which concerns on this embodiment uses the winding apparatus 70 mentioned above, and the glass chopped strand mat M is conveyed to the core 72 at the conveyance speed of 10 m / min-150 m / min. Is wound to produce a wound body R of the glass chopped strand mat M.

  When the conveyance speed of the glass chopped strand mat M is less than 10 m / min, the production efficiency is not improved in mass production, which is not economical. On the other hand, if the conveying speed exceeds 150 m / min, even if the glass chopped strand mat M comes into contact with the outer peripheral surface of the core 72, it is not preferable because it will not be caught following the rotation of the core.

  From the above viewpoint, in order to perform winding with higher quality and high stability, the conveying speed is preferably in the range of 20 m / min to 130 m / min, more preferably 40 m / min to 100 m. / Min, more preferably 70 m / min to 90 m / min.

The wound body R of the glass chopped strand mat M manufactured by the manufacturing method according to the present embodiment has a configuration in which no adhesive is applied or woven in the vicinity of the tip position of the wound glass chopped strand mat M. can do.
Here, the vicinity of the tip position of the glass chopped strand mat M is, for example, a portion having a dimension from the tip of the glass chopped strand mat M to 1000 mm.

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

The winding core 72 is a cylindrical body for winding the glass chopped strand mat M. For example, the winding core 72 is a paper tube having a paper material such as a paper tube base paper, kraft paper, or wrapping paper as a structural material.
The winding core 72 is manufactured in a cylindrical shape while rotating the above-mentioned base paper on a metal shaft core called a mandrel, with the above-mentioned base paper being stacked in layers.

  For the purpose of a decorative finish, top-coated paper such as wrapping paper or wrapping paper is used on the outer peripheral surface of the core 72.

  Further, the core 72 is preferably the above-described paper tube in consideration of economy, but when the mechanical strength is important, it is made of a material such as plastic or FRP, for example. Also good.

In the method for manufacturing the wound body R of the glass chopped strand mat M according to the embodiment of the present invention, at least a part of the tip portion M1 of the glass chopped strand mat M is brought into contact with the outer peripheral surface of the core 72 and wound. JIS K 7125 (1999) on the outer peripheral surfaces of the glass chopped strand mat M and the winding core 72 in the step of winding the glass chopped strand mat M in a roll shape by rotating the core 72 to form the wound body R. The dynamic friction coefficient measured in accordance with the method specified in Section 0.25 is 0.35 to 0.35, and the basis weight of the glass chopped strand mat M is 70 g / m ² or more and 250 g / m ² or less. .

The dynamic friction coefficient is more preferably 0.28 to 0.32, and the basis weight of the glass chopped strand mat M is more preferably 90 g / m ² or more and 180 g / m ² or less.

As means for obtaining the above-mentioned dynamic friction coefficient, specifically, it is preferable that the surface of the upper adhesive paper used for the outer periphery of the core 72 is kraft paper having a large dynamic friction coefficient.
Although details will be described later, since the dynamic friction coefficient changes depending on the type and thickness of the kraft paper, it is preferable to select a kraft paper suitable for the glass chopped strand mat M.
In order to make it difficult to damage the surface of the glass chopped strand mat M, the outer peripheral surface is preferably covered with the same material.

  Further, the dynamic friction coefficient between the glass chopped strand mat M and the core 72 measured according to the method defined in JIS K 7125 (1999) described above is in the range of 0.25 to 0.35. The object of the present invention is achieved by using the core 72 that has been processed and adjusted in advance so as to have a predetermined dynamic friction coefficient.

That is, when the dynamic friction coefficient exceeds 0.35, the slipping property between the glass chopped strand mat M and the core 72 is extremely lowered, and the tip M1 of the glass chopped strand mat M is in contact with the outer peripheral surface of the core 72. At the moment the winding action works strongly and winding is started.
As a result, the glass chopped strand mat M is wound in a distorted state and the winding misalignment and the glass chopped strand mat M are wrinkled, the winding shape of the entire wound body R becomes extremely bad, and the glass chopped strand mat is further deteriorated. The surface of M is damaged.

On the other hand, if the coefficient of static friction between the glass chopped strand mat M and the core 72 is less than 0.25, the stability when the glass chopped strand mat M is directly wound around the core 72 is poor, and the Even if the glass chopped strand mat M is wound, the core 72 is easily rotated idly at the initial winding stage.
As a result, sagging occurs in the glass chopped strand mat M, and winding deviation and wrinkles enter to eliminate sagging.

The basis weight of the glass chopped strand mat M is preferably 70 g / m ² or more and 250 g / m ² or less.
When the basis weight is less than 70 g / m ² , the friction coefficient of the surface of the glass chopped strand mat M becomes small, and the rigidity of the mat decreases and wrinkles easily occur. It is difficult to stably wind a glass chopped strand mat around a winding core so as to eliminate winding slip and wrinkles.
On the other hand, when the basis weight is 250 g / m ² or more, the rigidity of the mat is improved. Therefore, it is difficult to stably wind up only by adjusting the coefficient of dynamic friction with kraft paper or the like. Will increase.

  In addition, the coefficient of static friction between the glass chopped strand mat M and the core 72 measured in accordance with the method defined in JIS K 7125 (1999) is in the range of 0.25 to 0.35 in advance. It is preferable to use a core 72 that has been processed and adjusted so as to have a predetermined coefficient of static friction. As a method for adjusting the static friction coefficient between the glass chopped strand mat M and the core 72, for example, the material of the surface of the core 72 is appropriately changed, or the surface of the core 72 is coated to adjust the friction. Applying an agent or adjusting the surface roughness of the surface of the core 72 may be mentioned.

  Next, examples will be described to describe the present invention more specifically. However, the present invention is not limited to these examples, and various applications can be made within the scope of the claims.

[Evaluation of winding state of wound body under each winding condition]
Using the winding device 70 described above, winding was performed by changing the outer peripheral material and thickness of the core 72 under each winding condition, and the winding state of the wound body R formed was visually evaluated.
Also, a method in which the outer peripheral material of the used core 72 and the surface of the glass chopped strand mat M (the surface on the contact side with the outer peripheral member at the initial stage of winding) are compliant with the method defined in JIS K 7125 (1999). The friction coefficient (static friction coefficient, dynamic friction coefficient) was measured.

[Examples and Comparative Examples]
(Winding condition 1) Matte weight 135 g / m ² , diameter of core: 102 mm, mat conveyance speed 90 m / min Example 1) Outer core material: Kraft paper (thickness 0.3 mm)
Example 2) Material of outer circumference of core: Kraft paper (thickness 0.5 mm)
Comparative Example 1) Outer peripheral material of core: wrapping paper (thickness 0.4 mm)

(Winding condition 2) Mat basis weight 107 g / m ² , core diameter: 102 mm, mat conveyance speed 90 m / min Example 3) Outer core material: Kraft paper (thickness 0.5 mm)

(Winding condition 3) Matte weight 70 g / m ² , Diameter of core: 102 mm, mat conveyance speed 90 m / min Comparative example 2) Outer material of core: Kraft paper (thickness 0.5 mm)

(Winding condition 4) Matte weight 280 g / m ² , Diameter of core: 102 mm, mat conveyance speed 90 m / min Comparative example 3) Peripheral material of core: Kraft paper (thickness 0.3 mm)
Comparative Example 4) Outer core material: Kraft paper (thickness 0.5 mm)

(Criteria: winding state)
◎: No scratches, winding deviations, or wrinkles ○: Weak wrinkles or weak winding deviations (a level that does not cause quality problems)
△: Wrinkle or winding deviation (quality problem)
X: Strong scratch generation / strong winding shift and wrinkle generation Table 1 shows the evaluation results of the winding state under each of the above conditions.

As is apparent from Table 1, in Examples 1 to 3, glass chopped strands having different weight per unit area are used when directly winding onto the core without using a member or means for joining the core and the glass chopped strand mat. It was possible to reliably wind the mat, and a wound body having a good winding shape could be produced efficiently and stably.
On the other hand, in Comparative Examples 1 to 4, the glass chopped strand mat was wound while being distorted to generate winding shift or wrinkle, and a good wound body could not be obtained.

From the above, according to the method for manufacturing the wound body R of the glass chopped strand mat M according to the embodiment of the present invention, the member that joins the core 72 and the tip M1 of the glass chopped strand mat M, etc. Without using, it became possible to wind the tip M1 of the glass chopped strand mat M directly around the winding core to reliably form the wound body R, and to suppress the occurrence of winding deviation and wrinkles of the glass chopped strand mat M. A wound body R with a good winding shape can be produced efficiently.
Specifically, a glass chopped strand mat having a dynamic friction coefficient of 0.25 to 0.35 on the outer peripheral surfaces of the glass chopped strand mat M and the core 72 and a basis weight of 70 g / m ² or more and 250 g / m ² or less. In M, a particularly good effect was observed for stable winding around the core.

Moreover, according to the manufacturing method of the wound body R of the glass chopped strand mat M which concerns on this embodiment, although content of the binder P in the glass chopped strand mat M is 5.0-13.0 mass%. preferable.
That is, when the binder is less than 5.0% by mass, the effect as the binder cannot be exhibited, and when the binder exceeds 13.0% by mass, the binder 72 becomes slippery with respect to the outer peripheral surface. For this reason, it is difficult to stably wind around the core.

Moreover, according to the manufacturing method of the wound body R of the glass chopped strand mat M which concerns on this embodiment, it is preferable that the outer diameter dimension of the winding core 72 is 50-150 mm.
That is, when the outer diameter dimension of the winding core 72 is less than 50 mm, the winding efficiency of the glass chopped strand mat M is deteriorated. When the outer diameter dimension of the winding core 72 exceeds 150 mm, the volume of the winding core itself is increased. This is because the handling of the body R deteriorates.

Moreover, according to the manufacturing method of the wound body R of the glass chopped strand mat M according to this embodiment, it is preferable that the material of the outer peripheral surface of the core 72 is kraft paper.
That is, since a desired dynamic friction coefficient can be obtained from kraft paper, the occurrence of winding deviation and wrinkles of the glass chopped strand mat M can be suppressed.

Further, the wound body R of the glass chopped strand mat M according to this embodiment is a wound body R of the glass chopped strand mat M formed in a roll shape by winding the glass chopped strand mat M around the winding core 72. The coefficient of dynamic friction measured in accordance with the method defined in JIS K 7125 (1999) on the outer peripheral surface of the glass chopped strand mat M and the core 72 is 0.25 to 0.35, and the glass chopped strand mat The basis weight of M is 70 g / m ² or more and 250 g / m ² or less.
According to such a configuration, it is possible to provide a wound body R of the glass chopped strand mat M in which the occurrence of winding deviation and wrinkles is suppressed.

Next, the manufacturing method of the wound body R of the glass chopped strand mat M according to one embodiment of the present invention will be described using the manufacturing apparatus 1 described above.
The manufacturing method of the glass chopped strand mat M according to the embodiment of the present invention can be realized by the manufacturing apparatus 1.

  As shown in FIG. 1, in the method of manufacturing the wound body R of the glass chopped strand mat M according to this embodiment, first, the glass chopped strand S · S is placed on the first conveyor belt B1 of the first conveyor 21. The step of depositing (STEP-1) is performed.

  Next, a step (STEP-2) of applying the binder P to the glass chopped strands S, S,... On the second conveyance belt B2.

  Next, a step (STEP-3) of heating and melting the binder P on the third conveyance belt B3 is performed.

  Next, a step (STEP-4) of cooling the glass chopped strands S, S... Having the binder P heated and melted to cure the binder P is performed.

  Next, the process of forming the winding body R by winding the glass chopped strand mat M around the winding core 72 by the method for manufacturing the winding body R of the glass chopped strand mat M using the winding device 70 described above (STEP- Perform 4).

  According to such a configuration, in the step of forming the wound body R (STEP-4), the glass chopped strand is used without using a member or the like that joins the core 72 and the tip portion M1 of the glass chopped strand mat M. It is possible to reliably form the wound body R by directly winding the tip M1 of the mat M around the winding core 72, and to prevent the mat from being wound or wrinkled, and to produce a wound body R with a good winding shape. Can be produced efficiently.

70 Winding device 72 Winding core S Glass chopped strand M Glass chopped strand mat M1 Tip P Binding agent R Winding body

Claims (7)

A method for producing a wound body of a glass chopped strand mat including a glass chopped strand,
At least a 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. In the process of
The dynamic friction coefficient measured according to the method defined in JIS K 7125 (1999) on the outer peripheral surface of the glass chopped strand mat and the core is 0.25 to 0.35,
A method of producing a wound body of a glass chopped strand mat, wherein the basis weight of the glass chopped strand mat is 70 g / m ² or more and 250 g / m ² or less.   The method for producing a wound body of a glass chopped strand mat according to claim 1, wherein the content of the binder in the glass chopped strand mat is 5.0 to 13.0 mass%.   The method for producing a wound body of a glass chopped strand mat according to claim 1 or 2, wherein a conveying speed of the glass chopped strand mat by the winding core is 10 m / min to 150 m / min.   The method for producing a wound body of a glass chopped strand mat according to any one of claims 1 to 3, wherein an outer diameter of the winding core is 50 to 150 mm.   The method for producing a wound body of a glass chopped strand mat according to any one of claims 1 to 4, wherein a material of the outer peripheral surface of the core is kraft paper. Depositing glass chopped strands on the belt of a conveyor comprising a belt;
Applying a binder to the glass chopped strands on the belt;
Heating and melting the binder on the belt;
Cooling the glass chopped strand having the heat-melted binder and curing the binder;
Forming the wound body;
The manufacturing method of the winding body of the glass chopped strand mat as described in any one of Claims 1-5 provided with these. 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,
The dynamic friction coefficient defined in JIS K 7125 (1999) on the outer peripheral surface of the glass chopped strand mat and the core is 0.25 to 0.35,
A wound body of a glass chopped strand mat, wherein the basis weight of the glass chopped strand mat is 70 g / m ² or more and 250 g / m ² or less.

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