JPS5921765B2 - Plastic molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a novel and useful method for molding plastic materials, in which a predetermined corner cut is made in a flat plastic wet sheet prior to molding it into a corrugated sheet or the like. This is related to.

For example, corrugated asbestos slate sheets are generally used for roofs and exterior walls with corner-cut roofing, and the corners where the vertical and horizontal panels overlap are cut off to prevent the overlapped sections from lifting up.

Conventionally, this corner cutting was generally done on the hardened product at the construction site.

This cutting work generates a large amount of dust, which poses occupational safety and health problems and problems with how to dispose of the cut-off parts at construction sites that are not equipped with dust collection equipment.

Therefore, there is a method of carrying out corner cutting before shipment at a production factory equipped with dust collection equipment, but this requires large-scale equipment and labor, which inevitably increases costs.

The present invention is a novel and useful method for forming plastic materials for cutting the corners of corrugated sheets, etc., which eliminates the above-mentioned drawbacks. The plastic wet sheets are adsorbed to a suction transport box having a corner cut member provided on the suction surface side, and the plastic wet sheets, whose corners have been cut by the corner cut member during suction, are placed in parallel at intervals. The wet sheet is moved and placed on a rough canvas stretched in close contact with the row of pipes, and then the pressure is reduced on the side of the canvas that is in close contact with the pipes to prevent misalignment between the canvas and the wet sheet. The present invention resides in a method of molding a plastic material, in which the distance between the pipes is shortened, and the wet sheet is made into a corrugated sheet.

In the present invention, the above-mentioned pipe rows are usually used as the corrugated mold member, but other members other than pipes may also be used as long as they have the same function.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for molding a plastic material according to the present invention will be described in detail below with reference to the accompanying drawings showing one embodiment thereof.

Figure 1 shows the conventional method of corner cutting of corrugated asbestos slate.
A is a hardened asbestos slate corrugated plate, B is an electric saw, and C is a corner cut portion to be cut off.

Needless to say, a large amount of dust is generated during cutting with an electric saw (which has the drawbacks mentioned above).

FIGS. 2 and 3 are explanatory diagrams showing one embodiment of the method for molding a plastic material according to the present invention. In FIG. 2 is its container, 3 is a cylindrical papermaking cylinder with a fine mesh wrapped around its surface,
4 is a papermaking felt that transfers the raw material film that has been made into a cylinder; 5 is a making roll that rolls up the thin film of felt to a predetermined thickness;
6 is a wet sheet cut out from the making chrysanthemum roll after reaching a predetermined thickness, and 7 is a conveyor for conveying the wet sheet.

A round blade 8 cuts the wet sheet into a predetermined width when the wet sheet is moved from the conveyor 7 to the conveyor 11.

9 is a round blade, and after the wet sheet stops at a predetermined position on the conveyor 11, the round blade 9 moves to cut the wet sheet into a predetermined length.

10 is a flat suction transport box for moving onto the wet sheet corrugation molding device, and when the length of the wet sheet has been cut, it descends and suctions the wet sheet at the same time.
As will be described later with reference to the drawings, one wet sheet is lifted and moved to the position of the corrugation molding device while cutting the corners.

FIG. 3 is an explanatory diagram of the Y-Y' arrow view in FIG.
Reference numeral 12 is a wave forming device (see Japanese Patent Publications No. 44-7555 and No. 46-1275), which inserts a flat wet sheet with a corner cut into a group of pipes 12-2 installed in parallel at intervals. It is placed on the hazuki canvas that is tightly stretched, and the pressure is reduced on the side of the canvas that is in close contact with the pipe, so that the canvas and the wet sheet are brought into close contact with each other, and the pipes are mutually connected while preventing the canvas and the wet sheet from shifting. Hydraulic cylinder 12-1 to shorten the interval between
A waveform is formed by operating the pipe group 12-2.

6-1 is a corrugated wet sheet, 13 is a corrugation suction transport box for sucking the wet sheet corrugated by the corrugation molding device from the corrugation molding device, lifting it up and transferring it to the stacking position; 10-1 is an air cylinder for vertical movement of the flat suction transport box, and 13-1 is an air cylinder for vertical movement of the corrugated suction transport box.

FIG. 4 is a perspective view of the flat suction conveyance box according to the present invention from the bottom surface, that is, the side that suctions cut wet sheets, and 10-2 is a corner knife attached to the bottom surface of the flat suction conveyance box 10. 10-3 is a hole for absorbing a wet sheet, and there is no hole in the corner.

The wet sheet is cut in the width direction by the round blade 8, and the wet sheet stopped at a predetermined position on the conveyor 11 is cut in the length direction by the round blade 9. The flat and corrugated suction transport boxes are connected by a trolley to form a flat sheet. The suction transport box moves to the top of the conveyor 11,
The flat suction conveyor box is lowered, and the wet sheet 6 is pressed by the knife 10-2 attached to the lower surface of the flat suction conveyor box and the rubber belt conveyor 11, and the corner is cut, and the inside of the flat suction conveyor box is exposed. The pressure is reduced and the suction hole 10
The wet sheet is suctioned by -3, and the flat suction transport box is moved upward by the operation of the vertical movement cylinder 10-1.
The cut corner remains on the conveyor 11, and movement of the conveyor 11 removes the corner from the conveyor.

On the other hand, the wet sheet sucked by the flat suction conveyor box is moved laterally to above the corrugation molding device 12, the flat suction conveyance box is lowered, and the wet sheet that has been suctioned is placed on the top of the corrugation molding device and corrugated. The pieces are then moved further to the stacking position by the corrugated suction transport box to complete the molding.

An example of an apparatus for carrying out the method for molding a plastic material according to the present invention has been described in detail with reference to FIGS. 2, 3, and 4, but the method of the present invention can also be carried out, for example, as follows.

That is, as shown in FIG. 3, the wet sheet 6 cut to a predetermined length and width and placed on the conveyor 11 is suctioned by the flat suction transport box 10, the corners are cut, and the sheet is lifted as it is and moved to the wave forming device. It is placed on an intermediate stand provided at position 12.

In this embodiment, the wave-forming device 12 uses an air cylinder 13-1 for vertical movement to move the wave-form suction conveyor box 13 shown in FIG.
The corrugation molding device 12 is moved to apply a corrugation to the wet sheet 6 placed on the intermediate table from above, and the corrugation is applied by reducing the pressure in the molding device 12. The wet sheet thus obtained is adsorbed by the apparatus and moved again as it is to return it to the position of the corrugated suction conveyance box 13 shown in FIG. 3, thereby obtaining a corrugated sheet.

As is clear from the above explanation, in the method of the present invention, it is possible to cut the entire wet sheet at the flat plate stage, which is the pre-process of forming the wet sheet into a corrugated shape, so it is possible to cut the entire wet sheet by simply attaching a knife of an extremely simple shape. Compared to conventional methods, there is no problem with dust, no additional work, and since it is processed during the manufacturing process, there is no increase in costs.
Since the cement in the cut corner has not yet hardened, it can be immediately recovered as raw material, which has the great advantage of reducing raw material costs, making it a new and useful device that is extremely economical.

Note that the wet sheet does not need to be made using the paper-making method shown in Figure 2, the wet sheet does not need to be cut using a round blade, and the corner cutting device is not limited to a knife, but can be cut using high-pressure water, laser beams, etc. It is also possible to do so by

[Brief explanation of drawings]

Among the accompanying drawings, FIG. 1 is an explanatory diagram showing a corner cut of a product cured by a conventional method, and FIGS. 2 and 3 are diagrams illustrating the overall method according to the present invention by one example.
FIG. 4 is a perspective view of a flat suction transport box showing an example of the corner cutting member used in the method of the present invention. The correspondence relationship between the main parts shown and the symbols is as follows. A...Hardened asbestos slate corrugated plate, B...
Electric saw, C... Corner cut part, 1...
・Raw material liquid, 2... Container, 3... Paper making cylinder, 4... Paper making felt, 5...
...Making roll, 6...Wet sheet, 7,11...Conveyor, 8,9...
...Round blade, 10...Flat suction transport box, 10-2
.... Corner cutting member, 10-3 .... Adsorber L 12 ..... Wave forming device, 12-1 ...
...Hydraulic cylinder, 12-2...Pipe, 13...Corrugated suction transport box, 1O-L13-1
...Air cylinder.

Claims (1)

[Claims] 1. A flat plastic wet sheet that has been previously cut vertically and horizontally to predetermined dimensions is suctioned to a suction transport box that has a corner cutting member provided on the suction surface side, and thus the above-mentioned sheet having the corner cut cut by the corner cutting member upon suction is The plastic wet sheet is moved and placed on the coarse canvas stretched in close contact with the rows of pipes installed in parallel at intervals, using the suction transport box, and then the pressure is reduced on the side of the canvas that is in close contact with the pipes. A method for molding a plastic material, characterized in that the canvas and the wet sheet are brought into close contact with each other to prevent displacement between the canvas and the wet sheet, while the distance between the pipes is shortened, and the wet sheet is formed into a corrugated shape.