HU188989B - Method for producing fibre reinforced plastic bodies by hand forming - Google Patents

Abstract

The reinforcing fibre mat is cut exactly to the right shape and placed in the lower half tool. A correctly measured amt. of plastic material, mixed with a catalyst where required, is poured onto the fibre mat. A ribbon of foam sponge is placed on the edge of the lower tool, so that a small gap is left at the highest point. The upper half tool is placed over the lower one and the two halves are closed up starting at the lowest point.

Description

BACKGROUND OF THE INVENTION The present invention relates to a process for producing small series of fiber-body plastic bodies by hand so that the surface of the finished product is of uniformly high quality.

If fiber-based plastic bodies are manufactured in small series 5, the only economical method is manual molding. This has a number of disadvantages, so due to the use of an open template, only one surface of the finished product is smooth; the fiber body content of the plastic body can be controlled over a large range only approx. Up to 23-25% by weight, airborne inclusions also occur when finished manually.

Other known methods, such as pressing, injection, rubber compression bagging, vacuum injection or machine injection technology, can only be used in large series because of the high cost of complex tools and manufacturing machines.

It is an object of the present invention to solve the quality problems encountered in the manual formatting process, but the machine and tool requirements of the process are not higher than conventional manual formatting. Our invention is based on the recognition that some elements of the machine process, in particular the use of a closed tool, can also be implemented in manual formwork.

The present invention relates to a process for the manual shaping of fibrous plastic bodies using closed molds 30, preforming the die surfaces in a known manner, cutting the filament out of a cut pattern and inserting the plastic into the lower die by initializing, catalyzing foam tape 35 is inserted with a small section, preferably at the highest point of the flange.

Leave 1-2 cm loose, place the upper tool half with the lower number half, slowly close the tool halves starting at the lowest point of the flange, and after the plastic has solidified, open the tool halves and lift the finished plastic body,

The process of the invention will be described in more detail with reference to an embodiment and the accompanying drawings, in which:

Figure 1 shows the tools before sealing, a

Figure 2 shows the tools after being closed.

The task is to manufacture a helmet. For this purpose, a closed tool consisting of the lower tool half 1 and the upper tool half 2 is used. Because the tools are not stress-relieved, they can even be made of fiberglass themselves, reinforced with a few ribs. 55

The working surfaces of the tools are first treated with a form selector and then coated with a brush or spray with a layer of gelcoat 3. The helmet is made of synthetic resin, the synthetic resin is accurately weighed, and the measured resin 5 is catalyzed and initialized into the deepest part of the lower die half.

A foam strip 6 is placed on the bottom edge of the lower half 1, leaving a gap of 1-2 cm at the highest point 9 of the lower half half.

The upper tool half 2 is then inserted into the lower tool half 1 and is closed in slow motion with the frog lock 7. The closure begins at the lowest point 11 of the flange 8 of the lower side of the numeral 1 and ends, if possible, with the closure of the frog locks 7 at the highest point 9.

After the resin 5 has solidified, the lower and upper tool halves 1 and 2 can be opened and the finished plastic body, if necessary, the helmet 10, can be removed.

This method achieves airtight impregnation of the fiber body 4 by precisely fitting the flanges 8 of the lower and upper tool halves 1 and the foam tape between them to completely seal the inside of the tool, thereby forcing the resin 5 to completely fill the space. slow closing score.

Since the 4-skeleton is soaked in a single operation, a homogeneous s / skeletal distribution can be achieved and the 4-skeleton content can be increased to 45% by weight.

As a result of the spreading of the resin 5 in a single operation and the impregnation of the fiber skeleton 4, the polymerization takes place at the same time to obtain a stress-free finished product.

Finally, the obvious advantage of the process is that the application of the sealed tool provides the required layer thickness everywhere, and the entire surface of the finished product is of the desired quality. Another advantage of manufacturing fibrous resin products is that the styrofoam does not evaporate due to the use of a closed mold.

Claims (1)

A patent claim A method for manually shaping fibrous body bodies using a closed tool, the tool parts (1, 2) of which are prepared in a known manner, the body (4) is cut from a cut pattern and placed in the lower tool shank (1), pouring the plastic (5) into the lower mold half (1), optionally catalyzed, initiating, placing a foam strip (6) on the lower mold half (1) flange so that it is at the highest point (9) of the flange (8). a small section, preferably Leave 1-2 cm free, place the upper tool half (2) on the lower tool half (1), slowly close the tool halves (1, 2) starting at the lowest point (11) of the flange (8) and finally the plastic (5) ), the tool halves (1, 2) are opened and the finished plastic body (10) is lifted.