CN1065174C

CN1065174C - Pour-casting concealed formation method for thermal plastic resin product

Info

Publication number: CN1065174C
Application number: CN95120340A
Authority: CN
Inventors: 荒井猛
Original assignee: MELHEN WORLD CO Ltd
Current assignee: MELHEN WORLD CO Ltd
Priority date: 1994-11-01
Filing date: 1995-10-31
Publication date: 2001-05-02
Anticipated expiration: 2015-10-31
Also published as: JP3029540B2; KR960017116A; JPH08127030A; KR100266918B1; CN1148535A

Abstract

To manufacture easily a resin product of a beautiful rubber elasticity having a number of colors and optional shapes at low cost. A molding method comprises a process of placing a molding sheet 1 provided with a molding tool 2 and a mask 3 consisting of a plurality of mask constituting pieces 3a, 3b, 3c... to be fitted into the molding tool 2 and separable one another on the upper face of a heated base plate 4 and a process of casting a thermoplastic resin liquid 6a of a desired color into a section from which optional mask constituting pieces in the mask 3 are removed, curing the resin and then casting a thermoplastic resin liquid 6b of the same color as above or different color into another section from which other mask constituting pieces are removed. Also the method comprises a process of embedding molding tools 2 of the molding sheet 1 successively by repeating the required number of curing processes and also a process of further heating a resin molded body 6 on the base plate 4 separated from the molding sheet 1, gelling, and then cooling the same.

Description

Forming method is sheltered in the cast of thermoplastic articles

What the present invention relates to is that forming method is sheltered in the cast of thermoplastic articles.

About thermoplastic articles, for example, there are parts, affix, the toy etc. such as keyseat, broaching tool of caoutchouc elasticity in past, all carries out moulding by blow molding or injection moulding.

But above-mentioned blow molding or injection moulding all are unsuitable for the moulding to above-mentioned little goods.The chances are for this, uses big shaping mould for little goods, must have to raise the cost.

The objective of the invention is, in view of the variety of issue that exists in the above-mentioned prior art, provide a kind of cast of thermoplastic articles to shelter forming method, this method is to use the profiled sheeting and the masking jig of the forming model of plastic arbitrary shape, one side heating one side is poured into thermoplastic resin liquid in the forming model of above-mentioned profiled sheeting successively, thereby can be at short notice, and moulding at low cost has the resin with caoutchouc elasticity of half circular stereo structure above a kind of.

For achieving the above object, forming method is sheltered in the cast of thermoplastic articles of the present invention, it is characterized in that having following operation:

One of operation is, places forming model and profiled sheeting on the table top of heating, this profiled sheeting have can embed in this forming model by separable a plurality of masking jigs that matrix is formed of sheltering,

Two of operation is, thermoplastic resin liquid with required color, be poured in the part of having taken out any masking jig structure sheet in the above-mentioned masking jig, after this resin solidification, thermoplastic resin liquid with color same as described above or different colours is poured in the part of taking out other masking jig structure sheet again, make it to solidify, the number of times that carries out necessity repeatedly by above-mentioned operation in turn fills up the forming model of above-mentioned profiled sheeting.

Three of operation is, further heating with platen that above-mentioned profiled sheeting separates on resin-formed body, make it gelation, make its cooling then.

Owing to have profiled sheeting, with the masking jig of forming by a plurality of masking jig structure sheets that are embedded into this forming model, and thermoplastic resin liquid is poured into successively taken out the part that each masking jig constitutes sheet, heating then, thus can be more easily and mold the beautiful goods of multiple color at low cost with caoutchouc elasticity.

Below, foundation description of drawings embodiments of the invention.

Fig. 1 is the key diagram of expression manufacturing process of the present invention, and Fig. 2 is the amplification profile behind the product molding, and Fig. 3 is the front elevation that adopts the goods of the inventive method manufacturing.

In Fig. 1, the 1st, the profiled sheeting of the about 1-3mm of thickness of slab, the inboard therein forming model 2 that can form arbitrary shape.

As this forming model 2, preferably such as shown in the figure punch die 2a, but also can utilize the not shown moulding recess that goes out.

The 3rd, the masking jig of and identical size identical shaped with above-mentioned forming model 2 is by each separable a plurality of masking jig structure sheet 3a, 3b, 3c ... constitute.

As above-mentioned profiled sheeting 1, optimum is silicane rubber plate, because its cost is low, and its characteristic aspect also has following advantage, that is, good heat resistance, processing easily, release property are also very good.But other sheet material, the metallic plate of for example stable on heating polyamideization or stainless steel etc. also can utilize.

And, with above-mentioned profiled sheeting 1, under the state that masking jig 3 embeds in this forming model 2, put on the platen 4, simultaneously this platen 4 also is placed on the hot plate 5, heating is about 1 minute under 150～180 ℃ temperature.

As platen 4, aluminium sheet is comparatively suitable, but other metallic plate such as iron plate, corrosion resistant plate can use.

As hot plate 5, as long as heating-up temperature is kept certain, the optional electrothermal heater of using, any in the gas heater.

As following operation, thermoplastic resin liquid 6a is poured in the forming model 2 of above-mentioned profiled sheeting 1.

Being described in detail as follows of this operation:

At first, on the profiled sheeting 1 from the platen 4 of above-mentioned heating, taken out a part of sheltering matrix 3, i.e. mask structure sheet 3a is poured into the thermoplastic resin liquid 6a of requirement color in the mould.

So the resin liquid 6a of cast constitutes sheet 3b, 3c with the inward flange of forming model 2 and other masking jig ... outward flange contact after, stop cast, and then, because the subsidiary round of surface tension protuberance, have the thickness of about 3-5mm and be cured.

Secondly, take out remaining masking jig by profiled sheeting 1 and constitute sheet 3b, to be poured into the thermoplastic resin liquid 6b of this part different colours, make it to carry out aforesaid curing, then, take off remaining masking jig again and constitute sheet 3c and pour into a mould the thermoplastic resin liquid 6c of other color that enters, and make its curing.

Below, make the number of times of the repetition necessity that uses the same method, pour into a mould thermoplastic resin liquid continuously, and be cured, when having filled with whole forming model 2, again will with as shown in Figure 2 resin-formed body 6 on the platen 4 that profiled sheeting 1 separates, heating is about 2-5 minute under 200～300 ℃ temperature, and makes its gelation.And, after gelation, cool off with water-cooled or natural cooling, when when platen 4 strips down, just made and had caoutchouc elasticity as shown in figure 3, and presented the goods A of the beauty of multiple color.

These goods A according to the shape of the forming model 2 of profiled sheeting 1, can make parts, affix or the toy etc. of keyseat, broaching tool barretter, Ka Qiusha etc.

Take out each masking jig from moulding 1 and constitute sheet 3a, 3b, 3c ... the time, in illustrated example, can use the pin 7 of drawing pin etc., but also can use other instrument in addition, perhaps only also can with hand.

Thermoplastic resin liquid

6a, 6b, 6c as the raw material of said products A ... material, as long as by heating because capillary effect, the material of rubber elastomer that can be shaped to half three-dimensional shape of band circle as shown in Figure 2 all can, no matter be that various types of resins such as polyvinyl or nylon are no problem, but flexible vinyl chloride resin wherein is better suited.As shown in Figure 1, in the container 8 with its tubulose of packing into,, and be poured in the forming model 2 of profiled sheeting 1 from the nozzle 8a ejaculation on top.

The present invention is owing to there being above-mentioned structure, so have following effect. (1), can be with comparalive ease, and produce at low cost by multicolour and arbitrary shape structure The resin of the beauty that becomes. (2), its surface configuration be whole body band circle half three-dimensional shape and by the caoutchouc elasticity material The resin that consists of, when being used for little goods class, for example parts, sequin, During toy etc., then realized very high commodity value. (3), use masking jig by using the profiled sheeting of the good silicon rubber of release property, reaching, the result makes Productivity improves significantly, and yield rate might as well. (4), compared with prior art do not spend Master Cost.

Being simply described as follows of drawing:

Fig. 1 is the key diagram of expression manufacturing process of the present invention.

Fig. 2 is the amplification profile behind the product molding.

Fig. 3 is to use the front elevation of the goods of the inventive method manufacturing.

To being described as follows of symbol:

1: profiled sheeting

2: forming model

3: masking jig

3a, 3b, 3c: masking jig constitutes sheet

4: platen

5: hot plate

Claims

1. forming method is sheltered in the cast of a thermoplastic articles, it is characterized in that, this method has following operation:

One of operation is, places forming model and profiled sheeting on the table top of heating, and this profiled sheeting has and embeds in this forming model, the masking jig of forming by detachable a plurality of masking jig structure sheets,

Two of operation is, thermoplastic resin liquid with required color, be poured in the part of having taken out masking jig structure sheet arbitrarily in the above-mentioned masking jig, make after this resin solidification, thermoplastic resin liquid with color same as described above or different colours is poured into the part of taking out other masking jig formation sheet again, and it is solidified, and carries out necessary number of times repeatedly by above-mentioned operation, in turn the shaping mould of above-mentioned profiled sheeting is filled up

Three of operation is, further makes the resin-formed body heating on the platen that separates with above-mentioned profiled sheeting, makes its gelation, makes its cooling then.