CN1422734A

CN1422734A - Ejection foaming and shaping apparatus

Info

Publication number: CN1422734A
Application number: CN 01139784
Authority: CN
Inventors: 张元奇
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-03
Filing date: 2001-12-03
Publication date: 2003-06-11

Abstract

The present invention discloses an ejection frothing forming equipment, which comprises an internal mould structure with hollow cavity, said internal mould strucure is made up by using calcined alloy with air permeability and the exterior of the internal mould structure is equiopped with exhaust device with air exhaust Channel. Said invention internal mould structure has good air exhaust function, and is suitable for making high-viscosity and high-frothing rate plastic material form, specially for making engineering plastics form easily.

Description

Ejection foaming and shaping apparatus

Technical field:

The present invention relates to a kind of ejection foaming and shaping apparatus, the particularly a kind of ejection foaming and shaping apparatus that air in the foaming and molding mould hole can be discharged.

Background technology:

Air in the tradition shooting foaming mould is to utilize deciliter gap of its male and female die face or deciliter gap, the exhaust ditch of template, discharges through the effect of plastic pressure; At full speed inject foaming and molding with this mould, can make the expansion-molded article about expansion ratio 1.1-1.6 times, but set the high magnification foaming injection molding that refers to for high viscosity, the air in the traditional moulds can not all be discharged.In order to improve expansion ratio, the Taiwan industry uses mould to foam outward at present, promptly in plastics, sneak into blowing agent, behind injection molding, the injection molding product are put into another mold heated to blowing temperature foam, but the foaming of this two-period form can only be used for the low viscosity plastics, as raw materials such as EVA, SBS .EPDM, PE systems, though adopt the two-period form foaming can reach 1.5-2.5 expansion ratio doubly, the high viscosity plastics still can't be shaped with above-mentioned two-phase method.

Summary of the invention:

The objective of the invention is to overcome above-mentioned defective, providing a kind of can more easily discharge the gas in the mould hole, is applicable to the ejection foaming and shaping apparatus of high viscosity, high foaming rate foaming injection molding.

For achieving the above object, the present invention adopts following technical scheme: this ejection foaming and shaping apparatus comprises the internal model structure that has cavity, this internal model structure is made by aeration calcination alloy, is outside equipped with the exhaust apparatus of band air discharging channel at calcination alloy system internal model structure.

Because the internal model structure of ejection foaming and shaping apparatus of the present invention is to be made by the calcination alloy of high aeration, when plastics foam in the cavity that injects internal model structure, the plastics that inject 15-20% can foam as for 100% (high magnification foaming), and the gas in the internal model structure cavity can borrow the pressure that blowing agent produced to be discharged by the aeration internal model structure; The ejection foaming and shaping apparatus of this structure does not have gas and exists in its internal model structure cavity, can obtain high-quality, uniform foaming and molding goods, and be applicable to high and low viscosity foaming and molding.

Description of drawings:

Fig. 1 is an embodiment assembled state sectional view of ejection foaming and shaping apparatus of the present invention

Fig. 2 is the decomposing state cutaway view of ejection foaming and shaping apparatus shown in Figure 1

Fig. 3 is the sectional elevation of ejection foaming and shaping apparatus shown in Figure 1

Fig. 4 is the exhaust condition schematic diagram of ejection foaming and shaping apparatus shown in Figure 1

The specific embodiment:

Below in conjunction with an embodiment and accompanying drawing ejection foaming and shaping apparatus of the present invention is described, but not delimit the scope of the invention;

Shown in Figure 4 as Fig. 1 one, this ejection foaming and shaping apparatus comprises a cast outer mold structure 10, this cast outer mold structure 10 is to be mutually combined by two external molds 11 to form, one side of this external mold 11 offers a volume space 12, and in external mold 11, laterally have first exhaust passage 13, vertically offer second exhaust passage 14, as shown in Figure 3, first exhaust passage 13 and second exhaust passage 14 connect mutually, and first exhaust passage 13 communicates with accommodation space 12 with second exhaust passage 14, (how much can increasing and decreasing according to user demand of exhaust passage).

One internal model structure 20, this internal model structure 20 is to be mutually combined by two internal molds 21 to form, this internal mold 21 is to be made by high aeration calcination alloy, this internal mold 21 just can be placed in the accommodation space 12 of cast outer mold structure 10, and be provided with gap 15 between internal mold 21 and the accommodation space 12, be equipped with first channeling 22 and second channeling 23 on one side of this internal mold 21 and the outer peripheral edges thereof respectively, the opposite side of internal mold 21 forms cavity 24 (in the cavity 24 is foaming product), and the moulding of cavity 24 can be done multiple variation according to the difference of goods.

One vavuum pump 30, this vavuum pump 30 connects first exhaust passage 13 and second exhaust passage 14 of cast outer mold structure 10, when vavuum pump 30 runnings, can extract the gas in first exhaust passage 13 and second exhaust passage 14 out cast outer mold structure 10.

With reference to Fig. 4, internal model structure 20 is placed in the accommodation space 12 of cast outer mold structure 10, and with vavuum pump 30 startup runnings, promptly continuously first exhaust passage 13 of cast outer mold structure 10 and the gas in second exhaust passage 14 are extracted out, at this moment, can be with plastics foaming in the cavity 24 of stream importing internal model structure 20, the plastics that inject about 15%-20% can foam to 100% (high magnification foaming); Because internal model structure 20 is to be made by the calcination alloy of high aeration, make the gas in the cavity 24 borrow the pressure that blowing agent produced to discharge through first channeling 22 and second channeling 23 of internal model structure 20, this gas is attracted by vavuum pump 30 and discharges through first exhaust passage 13, second exhaust passage 14 of cast outer mold structure 10; Making does not have gas to exist in the cavity 24 of internal model structure 20, thereby can obtain high-quality, foaming and molding goods uniformly, and this ejection foaming and shaping apparatus is applicable to the goods of high and low viscosity.

Ejection foaming and shaping apparatus of the present invention has following advantage:

1, because the internal model structure of ejection foaming and shaping apparatus of the present invention is to be made by the calcination alloy of high aeration, when plastics inject interior foaming of cavity of internal model structure, the plastics that inject 15%-20% can foam to 100%, gas in the cavity can be borrowed the pressure that blowing agent produced, in internal model structure, discharge, make that not having gas in the cavity in the aeration internal model structure exists, this device is applicable to the shooting foaming molded article of high and low viscosity.

2, ejection foaming and shaping apparatus of the present invention links to each other vavuum pump with the exhaust passage of cast outer mold structure, the gas of being discharged in the internal model structure cavity can be borrowed the attraction of vavuum pump and discharge through the exhaust passage of external mold; The present invention can become very easy with high magnification foaming and moldings such as highly difficult engineering plastics.

Claims

1, a kind of ejection foaming and shaping apparatus comprises the internal model structure that has cavity, it is characterized in that: described internal model structure is made by aeration calcination alloy, is outside equipped with the exhaust apparatus of band air discharging channel at calcination alloy system internal model structure.

2, ejection foaming and shaping apparatus according to claim 1, it is characterized in that: described exhaust apparatus is a cast outer mold structure, offer an accommodation space in this cast outer mold structure, at least one exhaust passage communicates volume space with atmosphere, described internal model structure is arranged at the accommodation space of cast outer mold structure.

3, ejection foaming and shaping apparatus according to claim 2 is characterized in that: described cast outer mold structure offers the exhaust passage that accommodation space is communicated with atmosphere by two external mold be combined intos on each external mold.

4, ejection foaming and shaping apparatus according to claim 2, it is characterized in that: described internal model structure is mutually combined by two internal molds and forms, between internal model structure and cast outer mold structure, be provided with the gap, and on the outer peripheral edges of internal mold combination, offer at least one channeling.

5, according to claim 2,3,4 described ejection foaming and shaping apparatus, it is characterized in that: a vavuum pump docks with the exhaust passage of cast outer mold structure.