CN1923493A

CN1923493A - Manufacturing method of hollow air blow molding

Info

Publication number: CN1923493A
Application number: CN 200510093748
Authority: CN
Inventors: 张哲诚
Original assignee: Shengyi Plastic Scientific And Technological Co Ltd
Current assignee: Shengyi Plastic Scientific And Technological Co Ltd
Priority date: 2005-08-29
Filing date: 2005-08-29
Publication date: 2007-03-07

Abstract

The invention relates to a method of hollow blowing shaping. Wherein, it comprises adhering coat movably on the inner mould wall of mother mould; compressing it with shaper into high-temperature semi-fused semi-solid cylinder blank; after some time, making the lower end sealed, compressing the blank at preset length, closing the father and mother moulds; extruding the rib of inner assistant mould of father one outside the surface of concavity; when two moulds are closed to contact blank, contracting the rib of assistant rib quickly to be parallel with the surface of concavity; forming long U-shaped groove on the blank; blowing gas into blank, to expand it to contact the surface of concavity of father mould and the coat at the surface of concavity of mother mould; and closing the U-shape groove to form strength rib; cooling and moving back the father and mother moulds, to obtain the hollow product.

Description

The preparation method of hollow blowing moulding

Technical field

The invention relates to a kind of hollow article forming method, refer to that especially a kind of finished product is combined into one with coating layer when moulding, and finished product inside possesses reinforced ribs, the surface is complete plane hollow blowing moulding preparation method.

Background technology

Often know the preparation method of hollow blowing moulding, be that die head by plastics extrusion molding machine extrudes into the high temperature fritting with thermoplastic, half consolidates the cylindrical shape stock of shape, die head central authorities continue to blow simultaneously, and after stock extrudes suitable one section, the kneading of stock lower end is closed, then when stock is pressed out to predetermined length, make inner face have the public affairs of suitable die cavity, master mold is by the clamping in opposite directions of stock both sides, and be subjected to public affairs in stock, behind the master mold cramping, by the blowing nozzle of male model one side installing to the operation of blowing of stock inside, stock is supported and be close to public affairs, the interior die wall of master mold, cool off action by the cooling line of installing on the master mold again, the cooling back is public, master mold is return toward opposite side, promptly molds required hollow finished product.

The aforesaid preparation method of often knowing the hollow blowing moulding has following problem demanding prompt solution:

1. as when desiring to be provided with coating layer such as flannelette, leather in finished surface, need after the finished product moulding, with adhesive agent coating layer is bonded in finished surface in addition, so not only many one procedures, and cause processing cost to increase, and the consolidation force between coating layer and finished surface is not good, is easy to use produce after a period of time to separate come off, and increases the service life.

2. as desiring to make finished product inside to possess the reinforcement rib, then need raised line to be set at the male model inner face, and after the finished product moulding, simultaneously form strip recess (shown in Figure 11 a and Figure 11 b) in it, so not only influence the aesthetic property of finished product, reinforcing effect that the reinforcement rib is possessed is not good, and limits the purposes of finished product greatly.

Summary of the invention

The present invention overcomes the defective of prior art, when being the finished product moulding, main purpose is combined into one with flannelette, leather or other material coating layer, and do not need after moulding, to cohere in addition processing action, thereby processing cost reduces, and combining between coating layer and finished surface is firm, and produces the situation about coming off of separating when not worrying using.

Another object of the present invention, the finished product that is institute's moulding not only possesses in inside reinforced ribs is arranged, and the surface of finished product is complete plane, thereby can obtain preferable aesthetic property and purposes more widely.

To achieve these goals, the invention provides a kind of preparation method of hollow blowing moulding, earlier with Beaver, leather or other material coating layer activity are attached at die wall in the master mold, and thermoplastic is extruded into the high temperature fritting by the die head of plastics extrusion molding machine, half consolidates the cylindrical shape stock of shape, die head central authorities continue to blow simultaneously, and after stock extrudes suitable one section, the kneading of stock lower end is closed, then when stock is pressed out to predetermined length, make inner face have the public affairs of suitable die cavity, master mold carries out clamping in opposite directions by the stock both sides, and the rib of the inner auxiliary mould of male model stretches out the die cavity surface of male model when beginning to carry out the clamping action, treat public affairs, after the master mold clamping compresses stock blink (about 0.3-0.5 second), die cavity surface with male model in the rib fast retractile male model of auxiliary mould trims, on the stock of first one-step forming, form strip U-lag portion this moment, be right after by the blowing nozzle of male model one side installing the operation of blowing of stock inside, stock is supported and be close to the coating layer on die cavity surface with the master mold die cavity surface of male model, strip U-lag portion closure forms reinforced ribs simultaneously, cool off action by the cooling line of installing on the master mold again, the cooling back is public, master mold is return toward opposite side, and, promptly mold required hollow finished product with unnecessary rim charge removal.

The present invention has following benefits:

1. be combined into one with Beaver, leather or other material coating layer during its finished product moulding, do not cohere processing action and do not need after moulding, to carry out secondary with adhesive agent in addition, thereby processing cost reduces, and coating layer can reach firm combining with finishing room, separate situation about coming off and take place and produce when not worrying using, prolong service life.

2. the finished product of its moulding not only possesses in inside reinforced ribs is arranged, and the surface of finished product is complete plane, thereby can obtain preferable aesthetic property and purposes more widely.

Description of drawings

Fig. 1 is a flow chart of the present invention.

Fig. 2 is the coating layer schematic perspective view that is sticked of a preferred embodiment of the present invention.

Fig. 3 is the blanking schematic perspective view of a preferred embodiment of the present invention.

Fig. 4 is the schematic diagram that mediate the stock bottom of a preferred embodiment of the present invention.

Fig. 5 stretches out generalized section for the auxiliary mould rib of a preferred embodiment of the present invention.

Fig. 6 is the matched moulds generalized section of a preferred embodiment of the present invention.

Fig. 7 is the auxiliary mould rib withdrawal generalized section of a preferred embodiment of the present invention.

Fig. 8 is the blowing moulding generalized section of a preferred embodiment of the present invention.

Fig. 9 moves back the mould generalized section for a preferred embodiment of the present invention.

Figure 10 is the finished product profile of a preferred embodiment of the present invention.

Figure 11 a is for often knowing the finished product stereogram of preparation method.

Figure 11 b is the profile of Figure 11 a.

The accompanying drawing sign

10, the cooling line on coating layer 20, master mold 21, the master mold

30, die head 40, stock 41, strip U-lag portion

40 ' finished product, 41 ' reinforced ribs 50, male model

51, the cooling line on flange 52, the male model

60, auxiliary mould 61, rib

The specific embodiment

Following conjunction with figs. is elaborated preferred embodiment of the present invention:

Shown in Fig. 1 flow chart of the present invention, it comprises the following step:

One, the coating layer (please cooperate and consult Fig. 2) that is sticked, in advance Beaver, leather or other material coating layer 10 fronts are processed into the characteristic of customer demand, the back side is processed into and is easy to the fixed characteristic of stock, fixes and coating layer 10 fronts are attached at master mold 20 interior die walls by linking tape or alternate manner activity.

Two, blanking (please cooperate and consult Fig. 3) extrudes into high temperature fritting, the half cylindrical shape stock 40 of shape admittedly by the die head 30 of plastics extrusion molding machine with thermoplastic (PP, PE), and die head 30 central authorities continue to be blown in stock 40 inside simultaneously.

Three, (please cooperate and consult Fig. 4) mediated in the stock bottom, after stock 40 extrudes suitable one section, stock 40 lower ends is closed with the manual type kneading.

Four, auxiliary mould rib stretches out (please cooperate and consult Fig. 5), when stock 40 is pressed out to predetermined length, the male and

female mould

50,20 that makes inner face have suitable die cavity carries out clamping in opposite directions by stock 40 both sides, and male model 50 inside assist the rib 61 of moulds 60 to stretch out the die cavity surface of male model 50 when beginning to carry out the clamping action.

Five, matched moulds (please cooperate and consult Fig. 6), then 50,20 clampings of male and female mould compress stock 40, stock 40 inner tool air blowing spaces are placed in the die cavity of male and

female mould

50,20, the rib 61 of auxiliary simultaneously mould 60 pushes stock 40 one side parts to being connected with another side, and the flange 51 of the die cavity periphery by male model 50 suppresses a flat ring figure with stock 40 and coating layer 10 unnecessary rim charges.

Six, auxiliary mould rib withdrawal (please cooperate and consult Fig. 7), after treating that 50,20 clampings of male and female mould compress 40 blinks of stock (about 0.3-0.5 second), die cavity surface with male model 50 in the rib 61 fast retractile male models 50 of auxiliary mould 60 trims, and simultaneously go up in the stock 40 of first one-step forming and form the strip U-lag portion 41 that is connected with another side this moment.

Seven, blowing moulding (please cooperate and consult Fig. 8), be right after by the blowing nozzle of male model 50 1 sides installings the operation of blowing of stock 40 inside, the die cavity surface that pressure by gas forces stock 40 both sides to be supported respectively to be close to male model 50 and the coating layer 10 on master mold 20 die cavity surfaces, simultaneously strip U-lag portion 41 be subjected to the pressure pushing and pressing of gas closed form reinforced ribs 41 '.

Eight, cooling, after stock 40 moulding, male and

female mould

50,20 still keeps cooling off action by the cooling line on the cooling line on the male model 52, the master mold 21 under the clamping state.

Nine, move back mould (please cooperate and consult Fig. 9), at last male and

female mould

50,20 is separated, and unnecessary rim charge is excised by flat ring inner edge, i.e. as shown in figure 10 finished product 40 of acquisition '.

Claims

1. the preparation method of a hollow blowing moulding, it comprises the following step:

(a) coating layer that is sticked is attached at the coating layer activity on the interior die wall of master mold fixing earlier;

(b) blanking extrudes into high temperature fritting, the half cylindrical shape stock of shape admittedly by the die head of plastics extrusion molding machine with thermoplastic, and die head central authorities continue to blow simultaneously;

(c) mediate the stock bottom, after stock extrudes suitable one section, the kneading of stock lower end is closed;

(d) auxiliary mould rib stretches out, when the stock that extrudes arrives predetermined length, the male and female mould that makes inner face have suitable die cavity carries out clamping in opposite directions by the stock both sides, and male model inside assists the rib of mould to stretch out the die cavity surface of male model when beginning to carry out the clamping action;

(e) matched moulds, then male and female die clamp combined pressure is supported stock, and the inner tool air blowing of stock space is placed in the die cavity of male and female mould, and by the rib of auxiliary mould stock one side part is pushed to being connected with another side;

(f) auxiliary mould rib withdrawal treats that male and female die clamp combined pressure supports stock after blink, and the die cavity surface with male model in the rib fast retractile male model of auxiliary mould trims, and forms strip U-lag portion this moment on the stock of first one-step forming;

(g) blowing moulding is right after by the blowing nozzle of male model one side installing the operation of blowing of stock inside, stock is supported and is close to the coating layer on die cavity surface with the master mold die cavity surface of male model, the closed reinforced ribs that forms of strip U-lag portion simultaneously;

(h) cooling, after the stock moulding, the male and female mould still keeps cooling off action under the clamping state;

(i) move back mould, at last the male and female mould is separated, and unnecessary rim charge is removed, promptly obtain the finished product of a hollow blowing moulding.

2. the preparation method of hollow blowing moulding as claimed in claim 1 is characterized in that, described coating layer can be Beaver or leather.

3. the preparation method of hollow blowing moulding as claimed in claim 1 is characterized in that, the rib of described auxiliary mould is to support the about 0.3-0.5 of stock after second in male and female die clamp combined pressure, and the die cavity surface with male model in the male model that contracts fast trims.

4. the preparation method of hollow blowing moulding as claimed in claim 1 is characterized in that, when blowing operation, and the closed reinforced ribs that forms of strip U-lag portion, the stock surface forms complete plane simultaneously.