CN102642300A

CN102642300A - Heated air delivery pipe of plastic stretch blowing machine

Info

Publication number: CN102642300A
Application number: CN2012101290869A
Authority: CN
Inventors: 林明茳
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-28
Filing date: 2012-04-28
Publication date: 2012-08-22

Abstract

A heated air delivery pipe of a plastic stretch blowing machine comprises an air delivery pipe with one end connected with an air storage tank and the other end connected with an air blowing valve. The heated air delivery pipe is characterized in that an electric heating device is arranged outside the wall of the air delivery pipe and used for heating the air delivery pipe and air in the air delivery pipe. The air pressurized by an air compressor enters the air storage tank, the air storage tank is connected with the air delivery pipe, the air in the air delivery pipe is blown into a plastic bottle pipe by the aid of the air blowing valve and an air blowing pipe, and the plastic bottle pipe is blown to form a plastic bottle. In order to meet the need of machining a thin-wall plastic container and lead the air blown into the bottle pipe to be hot air, the electric heating device is arranged outside a section of the air delivery pipe and used for heating the air delivery pipe and the compressed air in the air delivery pipe.

Description

Plastic draw-blow machine heated type appendix

Technical field

The present invention relates to plastic draw-blow machine heated type appendix, belong to the plastics machinery field.

Background technology

Polyester such as employing PET are raw material, produce hollow plastic containers such as mineral water bottle, oil bottle through annotating stretch blow, in process; At first plastic raw materials is processed into the bottle pipe, after again the bottle pipe being heated, then stretch blow-molded by plastic draw-blow machine; Said stretch-blow comprises the stretch, sealing cylinder and the scavenger system that are driven by elevating mechanism, and after the bottle pipe after the heating was placed in the mould, stretch was inserted in the bottle pipe; Sealing cylinder seals the bottle mouth of pipe; But sealing cylinder blows afloat mouth, and the compressed air of scavenger system is blown in the bottle pipe, by stretch the bottle pipe is elongated on the one hand; Being dried in the bottle pipe by compressed air on the other hand dilates, and reaches bottle moulding purpose.Processed plastic bottle-pipe is heated by heater, and the air that is blown in the bottle is a normal temperature, and height is different along with the variation of environment temperature; After the bottle inside pipe wall (about more than 100 ℃) after the heating ran into normal temperature air, inner wall surface can produce plasticity and reduce, and blowing of bottle is long than having only 1:3.8; Draw ratio has only 1:2.5, and occurs the hickie phenomenon easily after the blow molding, and this container influence for heavy wall is little; But for thin-walled pressure vessel; Especially telescopic plastic containers, Chinese patent ZL200920115852.x for example, name is called the special container of " disposable self-suction scuttlebutt " and so on; Can't realize according to the normal temperature air bottle blowing, not reach desirable product requirement.

Summary of the invention

The objective of the invention is in order to overcome the shortcoming that prior art exists; Provide a kind of and in the bottle pipe, be blown into hot-air; The air of bottle blowing is close with the temperature that heats in the bottle pipe of back, is specially adapted to thin-walled pressure vessel and processes, guarantee the plastic draw-blow machine heated type appendix of product quality.

The technical scheme of plastic draw-blow machine heated type appendix of the present invention is: comprise that connects an air accumulator; And the other end connects the appendix of purge valve; The tube wall that it is characterized in that described appendix is provided with electric heater unit outward, and electric heater unit heats the air in appendix and the appendix.

The invention discloses a kind of plastic draw-blow machine heated type appendix; Arrive in the air accumulator through the air compressor air pressurized, air accumulator connects appendix, and appendix is again through purge valve and gas blow pipe; Air is blown in the plastic bottle-pipe, plastic bottle-pipe is blow molded into plastic bottle.For the needs of processing thin-walled plastic containers, making the air that is blown in the bottle pipe is hot-air, so outside a section of appendix, electric heater unit is set, by electric heater unit the compressed air in appendix and the appendix is heated.The technical scheme of said electric heater unit is a lot, and one of example is that insulated electro heat pipe or electrical bar are set outside appendix, outside the insulated electro heat pipe, heat-insulation layer is set, and the concrete structure of electrothermal tube belongs to prior art, for example as the electrothermal tube in the electric teapot; Two of example is that insulator is set outside appendix, and insulator is provided with heating wire outward, and heating wire is established insulating bar outward again, and then there is heat-insulation layer the outside; Three of example is electric blankets in the appendix outsourcing, and electric blanket has heat-insulation layer outward.Compressed air after being heated (air themperature is near bottle pipe temperature) gets in the bottle pipe, makes a bottle inside pipe wall surface exempt from knot " broken skin ", does not go out hickie, keeps good plasticity, and the plastic bottle intensity of moulding is good, exempts to break.This programme technology is simple, and bottle base is by the gas blow molding after heating, and the transparency of bottle is high, and blowing of bottle is long than reaching 1:6.4, in processing thin-walled plastic containers, obtains beyond thought effect.

Plastic draw-blow machine heated type appendix of the present invention, said appendix connects a purge valve or connects two purge valve.Two purge valve that said appendix connects, one is low pressure pre-blowing purge valve, one is the high-pressure molding purge valve.Earlier through low pressure pre-blowing purge valve bottle base is carried out pre-blowing during bottle blowing, the while stretch stretches into bottle base and stretches, and carries out bottle blowing by the high-pressure molding purge valve then; Stretch is then withdrawn; The high-pressure molding purge valve is to the bottle base blow molding, and two purge valve blowings successively avoid bottle base overheated; Stretch adheres on bottle wall, influences the quality of production.Said through after the electric heater unit heating, the air themperature in the appendix is 100 ℃-200 ℃.Bottle pipe after the heating arrives temperature in the stretch blow mould about 100 ℃, so through after the electric heater unit heating, the air themperature in the appendix is between 100 ℃-200 ℃, require near or a little more than the temperature of bottle pipe, the better effects if of processing like this.Said through after the electric heater unit heating, the air themperature in the appendix is 150 ℃-180 ℃.Air themperature the best in the appendix is 150 ℃-180 ℃.

Description of drawings

Fig. 1 is the structural representation of plastic draw-blow machine heated type appendix of the present invention.

The specific embodiment

The present invention relates to a kind of plastic draw-blow machine heated type appendix; As shown in Figure 1; Comprise that connects an air accumulator 1; And the other end connects the appendix of purge valve, it is characterized in that the tube wall of described appendix 2 is provided with electric heater unit 3 outward, and electric heater unit heats the air in appendix 2 and the appendix.Arrive in the air accumulator 1 through the air compressor air pressurized, air accumulator connects appendix 2, and appendix through purge valve and gas blow pipe, is blown in the plastic bottle-pipe air again, and plastic bottle-pipe is blow molded into plastic bottle.For the needs of processing thin-walled plastic containers, making the air that is blown in the bottle pipe is hot-air, so outside a section of appendix, electric heater unit 3 is set, by electric heater unit the compressed air in appendix 2 and the appendix is heated.The technical scheme of said electric heater unit 3 is a lot, and one of example is that insulated electro heat pipe or electrical bar are set outside appendix 2, outside the insulated electro heat pipe, heat-insulation layer is set, and the concrete structure of electrothermal tube belongs to prior art, for example as the electrothermal tube in the electric teapot; Two of example is outside appendix 2, insulator to be set, and insulator is provided with heating wire outward, and heating wire is established insulating bar outward again, and then there is heat-insulation layer the outside; Three of example is electric blankets in appendix 2 outsourcings, and electric blanket has heat-insulation layer outward.Compressed air after being heated (air themperature is near bottle pipe temperature) gets in the bottle pipe, makes a bottle inside pipe wall surface exempt from knot " broken skin ", does not go out hickie, keeps good plasticity, and the plastic bottle intensity of moulding is good, exempts to break.This programme technology is simple, and bottle base is by the gas blow molding after heating, and the transparency of bottle is high, and blowing of bottle is long than reaching 1:6.4, in processing thin-walled plastic containers, obtains beyond thought effect.Said appendix 2 connects a purge valve or connects two purge valve.Two purge valve that said appendix 2 connects, one is that 41, one of low pressure pre-blowing purge valve are high-pressure molding purge valve 42.Earlier carry out pre-blowing through 41 pairs of bottle bases of low pressure pre-blowing purge valve during bottle blowing, the while stretch stretches into bottle base and stretches, and carries out bottle blowing by high-pressure molding purge valve 42 then; Stretch is then withdrawn; 42 pairs of bottle base blow moldings of high-pressure molding purge valve, two purge valve blowings successively avoid bottle base overheated; Stretch adheres on bottle wall, influences the quality of production.Said through after electric heater unit 3 heating, the air themperature in the appendix 2 is 100 ℃-200 ℃.Bottle pipe after the heating arrives temperature in the stretch blow mould about 100 ℃, so through after electric heater unit 3 heating, the air themperatures in the appendix 2 are between 100 ℃-200 ℃, require near or a little more than the temperature of bottle pipe, the better effects if of processing like this.Said through after electric heater unit 3 heating, the air themperature in the appendix 2 is 150 ℃-180 ℃.Air themperature the best in the appendix 2 is 150 ℃-180 ℃.

Claims

1. plastic draw-blow machine heated type appendix; Comprise that connects an air accumulator (1); And the other end connects the appendix of purge valve; The tube wall that it is characterized in that described appendix (2) is provided with electric heater unit (3) outward, and electric heater unit heats the air in appendix (2) and the appendix.

2. plastic draw-blow machine heated type appendix as claimed in claim 1 is characterized in that said appendix (2) connects a purge valve or connects two purge valve.

3. plastic draw-blow machine heated type appendix as claimed in claim 2 is characterized in that two purge valve that said appendix (2) connects, and one is low pressure pre-blowing purge valve (41), and one is high-pressure molding purge valve (42).

4. plastic draw-blow machine heated type appendix as claimed in claim 1 is characterized in that saidly through after electric heater unit (3) heating, and the air themperature in the appendix (2) is 100 ℃-200 ℃.

5. plastic draw-blow machine heated type appendix as claimed in claim 1 is characterized in that saidly through after electric heater unit (3) heating, and the air themperature in the appendix (2) is 150 ℃-180 ℃.