JPH09239837A - How to connect composite sheets - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: The thickness of a connecting portion is almost the same as the thickness of a composite sheet, and the connecting strength of the connecting portion is also excellent, which is suitable for use as a core material for laminated molded products such as fiber composite eaves gutters. To provide a method of connecting composite sheets that can. SOLUTION: The thermoplastic resin powder 5 is fluidized and impregnated between a plurality of glass rovings 2, and the thermoplastic resin powder 5 except for both ends in the longitudinal direction is heated and melted by a heating roll. In the method for connecting the composite sheets 10 to each other, the glass rovings 2 of the unmelted winding start portion 10a and the winding end portion 10b of both the composite sheets 10 are cut out in a comb shape, and the cutout portions 102a and 102b are formed. A method for connecting a composite sheet, in which the comb sheets 101a and 101b are superposed so that they can be meshed well and are heated and pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a composite sheet which is composed of a thermoplastic resin and long fibers and can be suitably used as a core material for laminated molded articles such as rain gutters, molds, corrugated boards and deck materials. .

[0002]

2. Description of the Related Art The following method is known as a method for connecting a composite sheet made of a thermoplastic resin and long fiber roving. A method in which the ends of the composite sheet are overlapped and the overlapped parts are heated and pressed to connect. A method in which the edges of the composite sheet are cut at right angles along the width direction, the cut portions are butted, and the thermoplastic resin in the vicinity of the butted portions is melt-connected. A method in which the edges of the composite sheet are cut at right angles along the width direction, the cut portions are butted, and a reinforcing material such as glass cloth is laid over the butted portions and heated and connected to each other.

[0003]

However, in the above method, the thickness of the overlapping portion becomes large, and the thickness of the composite sheet after connection becomes uneven. Therefore, depending on the purpose of use, for example, when the composite sheet is used as a core material, the core material is shaped into a predetermined shape, and the surface is melt-extruded with a thermoplastic resin to produce a fiber composite eaves trough. It was suitable.

That is, in the step of shaping the eaves trough into a shape substantially corresponding to the eaves gutter shape, the shaper is likely to be clogged, which interrupts the production of the eaves gutter.

On the other hand, in the above method, since there is no problem of the thickness of the connection portion in the method because it is a connection portion by butt, the connection strength is inferior, so it is not suitable for the production of the above fiber composite eaves gutter. there were.

Also in the above method, the problem of the thickness of the connecting portion can be solved by selecting the kind of the reinforcing tape, but the connecting strength is slightly inferior, and therefore it is not suitable for the production of the above fiber composite eaves gutter.

That is, in the case of producing a fiber composite eaves gutter using the composite sheet obtained by the above method and as a core material, in the step of shaping the fiber composite eaves gutter into a shape substantially corresponding to the eaves gutter shape by a shaping device, The core material is likely to come off at the connection portion, which also interrupts the manufacture of eaves gutters.

The object of the present invention is that the thickness of the connecting portion is almost the same as the thickness of the composite sheet, and the connecting strength of the connecting portion is also excellent, and it is suitable for use as a core material for laminated molded articles such as fiber composite eaves gutters. It is to provide a method of connecting composite sheets that can be used.

[0009]

According to the method for connecting a composite sheet of the present invention as set forth in claim 1, the thermoplastic resin powder is fluidly impregnated between a plurality of long fibers, and a portion excluding both longitudinal end portions is removed. A method for connecting composite sheets obtained by heating and melting a thermoplastic resin powder with a heating roll, in which unmelted end portions of both composite sheets are cut out in a comb-tooth shape, and this cutting is performed. This is a method in which the notched portions are overlapped with each other and hot-pressed.

The composite sheet used in the present invention is obtained by fluidly impregnating a plurality of long fibers with a thermoplastic resin powder, and heating and melting the resin powder with a heating roll to form a long sheet. There is an unmelted portion of a predetermined length at both ends in the longitudinal direction of this sheet. The length of this unmelted portion depends on the width of the composite sheet, but is 200
mm-1000 mm, preferably 300 mm-60
It may be about 0 mm.

Any resin powder may be used as long as it is a thermoplastic resin, for example, vinyl chloride resin, vinylidene chloride resin,
Powdered materials such as acrylic resin, vinyl acetate resin, vinyl chloride / vinyl acetate copolymer resin, and olefin resin can be used.

As the long fibers, long ones such as glass fibers, carbon fibers and synthetic fibers can be used. Also,
Depending on the required functions of laminated molded products, short fibers,
Composite fibers reinforced with non-woven fabrics, woven fabrics, mats and nets may be used.

(Operation) In the method for connecting a composite sheet according to the present invention as set forth in claim 1, the thermoplastic resin powder is fluidly impregnated between a plurality of long fibers, and the thermoplastic resin of a portion excluding both ends in the longitudinal direction is applied. A method of connecting the composite sheets obtained by heating and melting the powder with a heating roll, wherein notches like comb teeth are formed between the unmelted ends of both composite sheets,
Since this is a method in which the notch portions are overlapped with each other and hot-pressed, a composite sheet having a thickness of the connecting portion that is substantially the same as the thickness of the composite sheet and excellent tensile strength of the connecting portion can be obtained.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are explanatory views showing a connecting step of the connecting method of the present invention, FIG. 2 is an enlarged plan view showing a cutout state of an end portion of a composite sheet, and FIG. 3 shows a manufacturing step of the composite sheet. It is an explanatory view shown.

First, the composite sheet used in the present invention will be described. As shown in FIG. 3, a plurality of bobbins 1
Glass roving 2 is guided by 20 guide bars 3 into the fluidized bed 4, and 50
A pair of heating rolls having a surface temperature of 180 ° C. are obtained after the glass roving 2 is opened and the floating vinyl chloride / vinyl acetate copolymer resin powder 5 is impregnated between the fibers while sending an air flow of 1 / sec. The composite resin 10 having a thickness of 0.5 mm, a width of 500 mm and a glass roving content of 45% by volume is obtained by passing through 6, 6 and heat-melting and pressing the impregnated powder resin, and the composite sheet 10 is wound on a winding roll 7. Two composite sheets 10 were prepared. The winding start portion 10a and the winding end portion 10b are both set to 300 mm, and the impregnated powder resin is not melt-pressed in this portion. Also,
The thickness of the sheet was 0.5 ± 0.1 mm.

Next, as shown in FIG. 1 (a), the glass rovings 2 at the winding start portion 10a and the winding end portion 10b of both composite sheets 10 are cut out in a comb shape at intervals of 20 mm. At that time, as shown in FIG. 2, the cutout portions 102a and 102b and the comb tooth portions 101a and 1 of both composite sheets 10 are formed.
To make a good mesh with 01b, shift and cut out.

Then, as shown in FIG. 1 (b), the winding start portion 10a and the winding end portion 10b of both composite sheets 10 are overlapped with each other so that the notches and the comb teeth are engaged with each other, and 180 ° C.
And heat press to connect them. The wall thickness distribution of this connection portion was 0.4 to 0.6 mm. In addition, when it was passed through a U-shaped shaping device (clearance: 1 mm) and pulled by a pulling machine for tensile evaluation, it was possible to continuously and stably perform shaping.

Comparative Example 1 For comparison, a composite sheet was manufactured in the same manner as above except that the winding start portion and winding end portion were not provided, and the end portions were overlapped by 300 mm,
Both were connected by hot pressing at 180 ° C. The wall thickness distribution of this connection portion was 0.8 to 1.2 mm. The same tensile evaluation as above was performed on the connected composite sheet, but the sheet was clogged and destroyed in the shaping apparatus.

(Comparative Example 2) Also, using the same composite sheet as in Comparative Example 1, the end faces of the end portions were abutted against each other, and the upper surface thereof was covered with glass cloth (width 500 mm, length 600 mm), and the temperature was changed to 180 ° C. Both were connected by hot pressing. The wall thickness distribution of this connection portion was 0.4 to 0.7 mm. The same tensile evaluation as above was performed on the connected composite sheet, but the connection part was disconnected and the sheet was broken.

[0020]

According to the method for connecting a composite sheet of the present invention as set forth in claim 1, the thermoplastic resin powder is fluidly impregnated between a plurality of long fibers, and the thermoplastic resin powder in a portion excluding both ends in the longitudinal direction. A method of connecting the composite sheets obtained by heating and melting the body with a heating roll, wherein the unmelted end portions of both composite sheets are notched in a comb shape, and the notched portions are Since it is a method of overlapping and hot pressing, it is possible to obtain a composite sheet having a thickness of the connecting portion that is almost the same as the thickness of the composite sheet and having excellent tensile strength of the connecting portion.

Therefore, using the composite sheet obtained by the present invention, the composite sheet is shaped into a predetermined shape, and a thermoplastic resin such as a hard vinyl chloride resin is melt-extrusion coated around the shaped composite sheet. When manufacturing eaves gutters by doing so, a fiber composite eaves gutter having a uniform thickness can be efficiently and continuously manufactured.

[Brief description of drawings]

FIG. 1A is a perspective view showing a state before connection, and FIG. 1B is a perspective view showing a state after connection.

FIG. 2 is an enlarged plan view showing a notched state of an end portion of a composite sheet with a part thereof omitted.

FIG. 3 is an explanatory view showing a manufacturing process of a composite sheet used in the present invention.

[Explanation of symbols]

 2 glass roving (long fiber) 5 thermoplastic resin powder 6 heating roll 10 composite sheet 10a winding start portion 10b winding end portion 101a comb tooth portion 101b comb tooth portion 102a cutout portion 102b cutout portion

Claims (1)

[Claims] 1. A composite obtained by fluid-impregnating a plurality of long fibers with a thermoplastic resin powder, and heating and melting a portion of the thermoplastic resin powder excluding both ends in the longitudinal direction with a heating roll. A method of connecting sheets, wherein the unmelted end portions of both composite sheets are cut out in a comb-like shape, and the cutout portions are overlapped with each other and heated and pressed to connect the composite sheets. Method.