JPH0775845B2 - Device for manufacturing preformed products of sheet-shaped thermosetting synthetic resin molding materials - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a preformed product of a sheet-shaped thermosetting synthetic resin molding material. More specifically, the present invention relates to a fibrous reinforcing material, for example, glass fiber, carbon fiber, synthetic resin fiber cut into a short length of about 6 to 100 mm, a thermosetting synthetic resin and an additive. Liquid mixture (paste)
And were mixed by a scraper type continuous impregnation device having two impregnation rolls, and the mixture was discharged from this device when a preformed product of a thermosetting synthetic resin molding material was produced using this mixture as a molding material. The present invention relates to an apparatus for producing a mixture as a molding material into a sheet-shaped preformed product.

[0002]

2. Description of the Related Art At present, when forming a preformed product of a thermosetting synthetic resin molding material containing a fibrous reinforcing material as exemplified above into a sheet, a fibrous reinforcing material,
For example, glass fiber, carbon fiber, synthetic resin fiber, etc. cut into a short length of about 6 to 100 mm,
Generally, a manufacturing method in which a mixture with a paste is mixed by a scraper type continuous impregnating device having two impregnating rolls, and the mixture is used as a molding material and scraped off from the surface of the impregnating rolls by a scraper is generally used. Has been adopted as However, in the case of this manufacturing method, the molding material is exclusively supplied as a bulk preformed product. This is because there is no effective method for directly molding the molding material scraped from the impregnating roll with a scraper into a sheet.

[0003]

In view of the above, the present invention is directed to a scraper type continuous impregnation apparatus in which a molding material scraped off from an impregnating roll by a scraper is directly molded into a sheet-like thermosetting synthetic resin. It is an object of the present invention to obtain a new manufacturing apparatus capable of obtaining a preformed product of a material.

[0004]

In order to solve this problem, in the present invention, by a scraper type continuous impregnating device having two impregnating rolls, a fibrous reinforcing material,
The molding material obtained by mixing with the paste is continuously scraped from the surface of the impregnating roll, and the scraped molding material is arranged at the end of the scraper and is spaced apart from each other. The sheet is continuously guided in the space between the pair of sheet-forming rolls rotating in the direction, in which case the peripheral speed of the sheet-forming roll is selected to be a fraction of the peripheral speed of the impregnating roll. It is characterized in that it is a preformed product in the form of a sheet.

That is, specifically, as shown in FIG. 1 of the accompanying drawings, an impregnating roll in which a paste P which is a liquid substance is placed facing each other with two intervals of a scraper type continuous impregnating device. Doctor member 2, on the surface of 1, 1 '
2'is applied evenly on each impregnating roll 1,
A fibrous reinforcing material F cut into a certain length is continuously supplied from the upper part of 1 ', and the paste P and the reinforcing material F are uniformly distributed within the space between the impregnating rolls 1, 1'. Mix and
After obtaining the mixture as the molding material 7, the molding material 7
From the surface of the impregnating rolls 1, 1 ′ by scrapers 6, 6 ′ arranged so as to contact their lower surfaces, and this molding material 7 is placed at a position where it is not interrupted.
Guided between a pair of opposed sheeting rolls 8 and 8 ′ located underneath the impregnating rolls 1 and 1 ′, which are spaced apart and continuously rotate in opposite directions to each other, these sheeting rolls 8 , 8 ', sheet-shaped preformed product 20
It is what In this case, when the peripheral speed of the impregnating rolls 1, 1'is V1, the peripheral speed V2 of the sheet forming rolls 8, 8'is a fraction of V1, for example, 1/2 to 1/50.
In addition, the scraper 6, 6 ', the end of the scraper 6, 6'on the side opposite to the impregnating roll 1, 1', the sheet-forming roll 8,
The distances L and L'with respect to 8'change depending on the length of the fibrous reinforcing material F, the viscosity of the paste P, the peripheral speed V2 of the sheet-forming rolls 8 and 8 ', etc. 400 mm
Hereinafter, it has been found that when the thickness is preferably 200 mm or less, good results can be obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. 1 and 2 of the accompanying drawings.

First of all, FIG. 1 shows a first embodiment of the present invention. As shown in the figure, 1 is rotated at a certain peripheral speed V1 and continuously in the opposite direction as shown in FIG. A pair of impregnating rollers 1, 1 ′ are arranged, and a doctor member 2, 2 ′ for uniformly applying the paste P on the surface thereof is arranged on the upper part of each of them, and each impregnating roll is also arranged. Cutter members composed of pressing rolls 3 and 3'and chopper rolls 4 and 4'are arranged above 1, 1 ', respectively, and the fibrous reinforcing materials 5 and 5'are fixed to a short length. After cutting into a short length of fibrous reinforcing material F, this is continuously applied onto the paste P applied as a uniform layer on the surface of the impregnating rolls 1, 1 '. Between the impregnating rolls 1, 1'supplied with the paste P and fibrous Uniformly mixing the reinforcing material F, mixture, i.e., a molding material 7, the molding material 7 'from the surface of, respectively, scraper 6,6' each impregnation roll 1,1 scrape through. Further, a pair of sheet rolls 8 and 8'are arranged at the other ends of these scrapers 6 and 6'at positions where the molding material 7 continuously scraped by them is not interrupted. Material 7
Guide within the space between these sheeting rolls 8, 8 '. In this case, a synthetic resin film, for example, a polyethylene film 9, 9'is passed through the surface of each sheet-forming roll 8, 8 ', and is sandwiched between these films 9, 9'to form the molding material 7 It is preferable to pass through. In this way, the molding material 7 passes between the sheet-forming rolls 8 and 8 ′ to obtain a sheet-shaped preformed product 20 in which both surfaces are covered with the synthetic resin films 9 and 9 ′. . In this case, as described above, the peripheral speed V2 of the sheet forming rolls 8 and 8'is 1 / to 1/50 of the peripheral speed V1 of the impregnating rolls 1 and 1 ', and the scraper 6,
The intervals L, L'between the end of 6'and the sheet-forming rolls 8, 8'are determined by the length of the fibrous reinforcing material F, the viscosity of the paste P, the circumference of the sheet-forming rollers 8, 8 '. It depends on the speed reduction ratio of the speed V2 to the impregnating rollers 2 and 2 ',
Generally, 400 mm or less is preferable, and preferably,
Select less than 200 mm.

Next, FIG. 2 shows a second embodiment of the present invention. In the embodiment shown in this FIG.
A pair of conveyor belts 10,1 in which the sheeting rolls 8,8 'in the first embodiment shown in FIG. 1 and described above are spaced in parallel and face each other.
It is different from that of the first embodiment in that it is replaced by 0, and these conveyor belts 10, 1
0 ′ moves at a linear velocity V2 corresponding to the peripheral velocity V2 of the sheet forming rolls 8 and 8 ′ in the first embodiment, so that the molding material 7 is made into a sheet-shaped preformed product 20.
It is what In addition, this conveyor belt 10, 1
As 0 ', a metal or plastic mesh belt can be used, and in any case, as shown in FIG. 2, synthetic resin films 9 and 9'are provided on the surface thereof. It is desirable to pass it.

The main materials used in the product according to the present invention are as follows. Synthetic resin: unsaturated polyester resin, epoxy resin, etc. Filler: calcium carbonate, clay, silica powder, gypsum, barium sulfate, etc. Reinforcement material: glass fiber, synthetic fiber, natural fiber, etc. Additives: curing agent, release agent, Colorants, stabilizers, thickeners, etc.

Next, an example of an experiment conducted on a preformed product of a sheet-shaped thermosetting synthetic resin molding material manufactured by the manufacturing apparatus according to the present invention will be described. 1. Unsaturated polyester resin 25% Filler (calcium carbonate) 40% Color paste 2% Others (lubricants, curing agents, etc.) 5% Glass fiber (length: 25.4 mm) 30% 2. Preformed product molding conditions Circumferential velocity V1 20 m / mln of impregnating rolls 1 and 1 ′ Peripheral velocity of sheet forming rolls 8 and 8 ′ or linear velocity V2 2 m / min scraper 6,6 ′ of conveyor belts 10 and 10 ′ The distance L between the sheet forming rolls 8 and 8'or the conveyor belts 10 and 10 ', L'100 mm, the thickness of the sheet 20 20 mm, a metal mesh belt is used as the conveyor belts 10 and 10'. , Synthetic resin film 11,
As 11 ′, a polyethylene film having a thickness of 50 μ was used.

As a result of molding under the above molding conditions using the paste and glass fiber having the above composition, a sheet-shaped preformed product having a thickness of 20 mm can be continuously obtained. done.

[0012]

As is apparent from the above description, conventionally, a scraper type continuous impregnating apparatus having two impregnating rolls has been used as a preformed product of a thermosetting synthetic resin molding material in a block form. However, the production apparatus according to the present invention allows continuous production of sheet-shaped preformed products of various thicknesses. Therefore, as compared with the conventional production apparatus, sheet-shaped preformed products can be obtained. The product can be manufactured with high productivity.

[Brief description of drawings]

FIG. 1 is a schematic layout showing an embodiment of a manufacturing apparatus according to the present invention.

FIG. 2 is likewise a schematic layout showing a second embodiment of the invention.

[Explanation of symbols]

 1, 1'impregnation roll 2, 2'doctor member 3, 3'pressing roll 4, 4'chopper roll 5, 5'fibrous reinforcing material 6, 6'scraper 7 molding material 8, 8'sheeting roll 9, 9'Synthetic resin film 10, 10 'Conveyor belt 20 Sheet-shaped preformed products

Claims (6)

[Claims] 1. A pair of impregnating rolls, which are arranged facing each other with a gap and continuously rotate in opposite directions, and a thermosetting synthetic resin which is arranged above the impregnating rolls and on the surface of each impregnating roll. It is placed above the impregnating roll and a doctor member that uniformly applies a liquid substance (hereinafter referred to as "paste") that is a mixture of a filler and additives, and cuts fibrous reinforcing material to a certain length. Then, the chopper member for continuously supplying the paste on the surface of the impregnating roll, and the mixture of the fibrous strength material and the paste mixed in the interval between the impregnating rolls are scraped off from the surface of the roll. A scraper-type continuous impregnation device comprising a scraper and a scraper for continuously advancing after the end of the scraper, facing each other at a distance and continuously rotating in opposite directions.
A pair of sheeting rolls are provided, in which case the peripheral speed of the sheeting rolls is selected to be a fraction of the peripheral speed of the impregnating rolls and scraped by a scraper member in the space between these sheeting rolls. An apparatus for producing a preformed product of a sheet-shaped thermosetting synthetic resin molding material, which guides the mixture and continuously forms the mixture into a sheet-shaped preformed product by these sheet forming rolls. 2. The apparatus for producing a preformed product of a sheet-shaped thermosetting synthetic resin molding material according to claim 1, wherein the peripheral speed of the sheet forming roll is 1/2 to 1/50 of the peripheral speed of the impregnating roll. 3. The apparatus for manufacturing a preformed product of a sheet-shaped thermosetting synthetic resin molding material according to claim 1, wherein a synthetic resin film is passed through the surface of the sheet-forming roller. 4. The apparatus for producing a preformed product of a sheet-shaped thermosetting synthetic resin molding material according to claim 1 or 2, wherein the sheeting roll is replaced by a pair of conveyor belts arranged opposite to each other. 5. The apparatus for producing a preformed product of a sheet-shaped thermosetting synthetic resin molding material according to claim 4, wherein the moving speed of the conveyor belt is 1/2 to 1/50 of the peripheral speed of the impregnating roll. 6. The apparatus for manufacturing a preformed product of a sheet-shaped thermosetting synthetic resin molding material according to claim 5, wherein the conveyor belt is a mesh belt made of metal or plastic.