KR930008443B1 - Forming method and apparatus for glass fiber reinforced thermoplastic resin sheet - Google Patents

Abstract

The method for manufacturing glass fiber reinforced thermoplastic synthetic sheet having good physical properties such as corrosion resistance, cold resistance, impact resistance and sound absorbing comprises: supplying continuously synthetic resin film from supplier above the transfer belt (5); laminating glass fiber (2) on the film; laminating thermoplastic resin melts from T-die (16); laminating non mat-phase glass fiber (2') again; passing through the heater (9); infiltrating resin melts to glass fiber homogeneously; covering by synthetic film (1'); and pressing and cooling repeatedly by multiple press (10,10').

Description

Method for manufacturing glass fiber reinforced thermoplastic synthetic resin sheet and apparatus therefor

1 is a perspective view of the manufacturing apparatus of the present invention.

2a, b, c, d or embodiment of the present invention manufacturing apparatus.

Figure 3a, b, c, d, e or an illustration of the arrangement of the reinforcing fibers.

4 is a conventional manufacturing apparatus.

* Explanation of symbols for main parts of the drawings

1,1 ': synthetic resin film 2,2': reinforcing fiber

3,3 ': guide tube 4,4': fiber feed device

5: transfer belt 7: thermoplastic melted resin

9: heating furnace 10,10 ': forming press

The present invention relates to a method and apparatus for producing a thermoplastic synthetic resin sheet excellent in physical properties such as corrosion resistance, cold resistance, sound absorption by reinforcing glass fibers in the thermoplastic resin.

In the prior art, Korean Patent Publication Nos. 85-1249 and 85-1250 use thermosetting resins, resulting in long processing times due to curing reactions, high storage conditions, short storage periods, and impossibility of regeneration. In order to remedy this disadvantage, thermoplastics have been used.

In addition, by a linear technique using a thermoplastic resin (Japanese Patent Publication No. 63-66657), as shown in Fig. 4, the extrusion from the extrusion device 12 is carried out at the center of the two layers 14 of continuous glass fibers in the form of a mat. The thermoplastic resin 13 is heat-pressed.

This production method is a continuous production method, but high productivity can be expected, but it is uneconomical because of high energy consumption and high price due to the structure of the facility because it is heated and cooled in the same continuous metal belt.

In addition, since the reinforcing fibers are already in the form of mats, the fluidity is poor during secondary processing such as heating and stamping, resulting in limited product molding.

Accordingly, an object of the present invention is to provide a method and apparatus for economically manufacturing a thermoplastic resin having excellent physical properties by using a mat-like reinforcing fiber while at the same time improving the disadvantages of the equipment.

Hereinafter, the present invention will be described in detail.

According to the present invention, in manufacturing a glass fiber reinforced thermoplastic synthetic resin sheet, a synthetic resin film is continuously supplied from a synthetic resin film supply device onto a conveying belt (5), and the glass fiber (not mat) is formed on the film by a glass fiber supply device. 2) After supplying and laminating, laminating the thermoplastic molten resin extruded from the T-die 16 on the upper layer, and then relaminating the glass fiber 2 'which is not mat-like supplied by a separate glass fiber feeding device. After passing through the heating furnace (9) to increase the temperature of the glass fiber and the flow rate of the molten resin so that the molten resin is uniformly impregnated in the glass fiber and then the laminate is transferred from the conveying belt to the synthetic resin film (1 ') It is a method of manufacturing a glass fiber reinforced thermoplastic synthetic resin sheet by carburizing and repeating compression and cooling with a plurality of molding presses 10 and 10 '.

In addition, the present invention is a device for producing a glass fiber reinforced thermoplastic synthetic resin sheet, a device for continuously supplying a synthetic resin film on the conveying belt (5) is provided, the glass fiber (2), not a mat (matte) is laminated thereon A glass fiber supply device is installed so that a T-die 6 for compressing the thermoplastic molten resin and a separate glass fiber supply device for relaminating the glass fiber 2 'that is not a mat are installed on the upper layer. A heating furnace 9 is installed at one side of the conveyance belt, a synthetic resin film supply device is installed at an upper portion of the outlet of the conveyance belt, and a plurality of molding presses 10 and 10 'are installed separately from the conveyance belt. It is a manufacturing apparatus of a glass fiber reinforced thermoplastic synthetic resin sheet.

Hereinafter, the present invention will be described in more detail.

The synthetic resin film used in the present invention is polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), nylon (Nylon), polybutylene tere Thermoplastic resin films such as phthalate (PBT) and polyethylene terephthalate (PET) and reinforcing fibers include organic or inorganic fibers such as glass fibers, carbon fibers, and aramid fibers.

As shown in FIG. 1, the reinforcing fibers 2 are cut in a fiber cutting feeder CHOPER 46 for cutting the reinforcing fibers to a predetermined length through the guide tube 3 on the synthetic resin film 1 fed from the roll. The stack is continuously stacked on the synthetic resin film 1 on the conveying belt 5.

In this case, the cutting length of the reinforcing fiber is preferably 5 to 60 mm, but should be adjusted in consideration of the required molding characteristics of the product, and the thermoplastic melt 7 is extruded from the T-die 6 for extrusion into a sheet. And the reinforcing fibers 2 'cut by the fiber cutting and feeding device 4' are continuously covered thereon to form a sandwich 8, which is caused by the cut reinforcing fibers. Since the temperature of the molten resin 7 falls, the fluidity of resin falls.

It is also possible to supply the fiber to the reinforcing fiber supply device that swings up and down or left and right without cutting the fiber instead of the fiber cutting supply device.

The conveying belt 5 is then passed through the heating furnace 9 to thereby increase the temperature of the reinforcing fibers cut at this time or irregularly unfolded to an infinite continuous length and the flow rate of the melted resin 7 to increase the flow rate of the melted resin 7. The silver is impregnated into the thermoplastic molten resin 7 in the intermediate layer by its own weight, and a part of the thermoplastic molten resin is moved to the reinforcing fiber layer beneath it by its own weight, so that the impregnation is better.

This reinforced impregnated sandwich (8) is a synthetic resin film (1 ') supplied from a synthetic resin film supply device installed on the upper portion of the outlet of the conveying belt to prevent the reinforcing fibers are exposed to the product surface or surface irregularities caused by the reinforcing fibers The sheet is covered with () and is compressed and cooled in a flat state by the forming presses 10 and 10 ′ in the next step to obtain a sheet of fiber-reinforced synthetic resin sheet 11 in a sheet form.

Here, it is preferable to keep the temperature of the thermoplastic melt to be compressed and cooled to about 50 to 80 ° C. or higher than the softening point in general, and the primary compression cooling by the molding press 10 may not complete the smoothness of the surface. In the storage process, there is a high possibility of causing deformation, thereby compressing secondarily by another molding press 1 'to eliminate sudden cooling and at the same time annealing the first molded.

This finished product is a great help in maintaining the surface quality of the product during the secondary processing, the synthetic resin film used here must be integrated with the sandwich (8) by the molding press (10), (10 ') T- The same kind and grade of the thermoplastic resin compressed in the die 6 are most preferable, but any one may be compatible with each other in a molten state and the film thickness is usually about 0.1 to 1 mm. Is preferred.

In addition, for special purposes, the synthetic resin films (1) and (1 ') can be used to change the color, impart conductivity, etc., and to easily process the woven fabric or other decorative objects and heating lamination during secondary processing. In order to achieve good melt adhesion with the heat-laminated object, a resin composition may be used.

For example, the melt resin of the sandwich 8 is polyethylene, and the films 1 and 1 'used for laminating aluminum thin plates in secondary processing are polyethylene ionomers having metal ions. It is recommended to use resin or ethylene acrylic acid resin.

The present invention does not use the glass fiber that is a mat (mat) without cutting the glass fibers to a certain length of lamination or use a long continuous fiber of infinite continuous length in a variety of lamination method does not have good fluidity during secondary processing Excluding the limitations caused by product forming, heating and cooling compression are carried out in the same continuous metal belt, which improves the energy consumption, and also enables the manufacturing of glass fiber reinforced thermoplastic synthetic resin sheet economically due to the low cost in terms of equipment structure. Brings effect.

Hereinafter, the present invention will be described in more detail with reference to Examples.

However, it is not limited to the Example of this invention.

EXAMPLE

Polypropylene (manufactured by Honam Oil Co., Ltd., Grade: M 540, M1: 8 (230 ℃, 21.6㎏)} and Lucky's glass fiber (Grade: MC 450-104) in a ratio of 70: 30 The length of the fiber was cut to 50 mm to form a sheet-like product to obtain the following results.

※ Measurement result: average value 3 times

In the embodiment, the glass fiber is cut to have a length of 50 mm and laminated as shown in FIG. 3a, but long fibers having an infinite continuous length may be laminated in consideration of required mechanical strength and secondary workability.

In other words, Figure 2a is to be supplied continuously without cutting the fiber to be supplied, but by supplying the fiber at the same linear speed as the traveling speed of the conveying belt (5) reinforcing fibers are arranged in one direction as shown in 3b.

2b or 3 " by reciprocating the continuous feeding device 4 "

2c or 3 " reciprocating motion in the same direction as the traveling direction of the conveying belt 5 can achieve an arrangement of the same shape as the 3d diagram.

FIG. 2d shows that the fibers are arranged in any shape (random) as in the 3e diagram by feeding the reinforcing fibers at a speed faster than the traveling speed of the conveying belt 5.

Claims (6)

In the apparatus for manufacturing a glass fiber reinforced thermoplastic synthetic resin sheet, an apparatus for continuously supplying a synthetic resin film is provided on the conveying belt (5), and the glass fiber supply apparatus for laminating the glass fibers (2) instead of the mat shape thereon. (4) is provided, and a T-die (6) for extruding thermoplastic molten resin and a separate glass fiber feeding device (4 ') for relaminating non-mat glass fibers (2') are provided on the upper layer. The heating furnace 9 is installed on one side of the conveyance belt, and the synthetic resin film supply device is installed on the outlet of the conveyance belt, and a plurality of molding places 10 and 10 'are provided separately from the conveyance belt. Glass fiber reinforced thermoplastic synthetic resin sheet manufacturing apparatus characterized in that it is installed. In the method for producing a glass fiber reinforced thermoplastic synthetic resin sheet, the synthetic resin film is continuously supplied from the synthetic resin film supply apparatus onto the conveyance belt (5), and the glass fiber, not the mat phase, is formed on the film by the glass fiber supply apparatus (4). (2) is supplied and laminated, and the thermoplastic molten resin extruded from the T-die 6 is laminated on the upper layer, and then the glass fibers other than mats supplied by the separate glass fiber supply device 4 ' ') Is re-laminated and heated through the heating furnace (9) to increase the temperature of the glass fiber and the flow rate of the molten resin so that the molten resin is uniformly impregnated with the glass fiber. A method of manufacturing a glass fiber reinforced thermoplastic synthetic resin sheet by carburizing with a film (1 ') and repeating compression and cooling with a plurality of molding presses (10) and (10'). The method of manufacturing a glass fiber reinforced thermoplastic synthetic resin sheet according to claim 2, wherein the glass fiber supplied from the glass fiber supply device is cut and supplied to 5 to 60 mm. The method of claim 2, wherein the glass fibers supplied from the glass fiber supply device is laminated to the uncut state of the laminated glass fiber manufacturing apparatus, characterized in that for supplying while feeding the glass fiber supply device swinging up and down or left and right How to. The apparatus of claim 1, wherein the glass fiber feeder is a cut feeder. The apparatus of claim 1, wherein the glass fiber supply device swings vertically or horizontally.