CN101376267A

CN101376267A - Injection molding device

Info

Publication number: CN101376267A
Application number: CNA2008102124520A
Authority: CN
Inventors: H·蔡德尔霍费尔; F·施塔策尔
Original assignee: Engel Austria GmbH
Current assignee: Engel Austria GmbH
Priority date: 2007-08-31
Filing date: 2008-08-29
Publication date: 2009-03-04
Also published as: AT504903A4; DE102008036115B4; DE102008036115A1; AT504903B1

Abstract

The invention relates to a injection molding device which comprises an extruder, a first injection cylinder, a second injection cylinder, a injection nozzle, two tubes of each injection cylinder for connecting the first and second cylinder to the extruder and the injection nozzle, and a valve. The valve (6) has two positions: while the valve is in the first position, one of the two tubes of the first injection cylinder (1) is used as filling channel (9a) to fill the injection cylinder through the extruder (3), and one of the two tubes of the second injection cylinder (2) is used as injecting channel (9b) to inject melt into the nozzle (4) from the injection cylinder (2); while the valve is in the second position, the other of the two tubes of the second injection cylinder (2) is used as filling channel to fill the injection cylinder (2) through the extruder, and the other of the two tubes of the first injection cylinder is used as injecting channel to inject melt into the nozzle from the injection cylinder (1).

Description

Coinjection molding apparatus

Technical field

The present invention relates to a kind of Coinjection molding apparatus with claim 1 preamble feature.

Background technology

A kind of injection (mo(u)lding) machine is known by EP 1 350 611, and this injection (mo(u)lding) machine has two equally and injects cylinder, but each injection cylinder only has a pipe.The melt that liquefies in extruder is pressed into by pipe and injects in the cylinder.After the valve of conversion in pipe, melt is injected in the molding unit via injecting nozzle by handling the injection cylinder.Injection molding process in this way, the region memory before being located immediately at of pipe injected cylinder is at the permanent dead volume of melt.In addition for from being filled to the conversion of injection, in the mode of this form of implementation of injection (mo(u)lding) machine, four valves that are used to change are set.

By DE 195 05 984 known a kind of injection (mo(u)lding) machines, this injection (mo(u)lding) machine is injecting the problem that cylinder solves dead volume.Therefore melt is transported to via long pipe in the back region of injecting cylinder and by handling this cylinder by extruder and is transported in the injection nozzle via a pipe that separates.By length and three irrelevant valves of each pipe, this document shows the form of implementation that expends very much of injection (mo(u)lding) machine.

A kind of injection (mo(u)lding) machines with an extruder and two injection cylinders of same demonstration wherein inject cylinder in this case and can alternately load by a rotatable valve with extruder in DE 101 60 810.Do not produce dead volume equally at this.But be that with the difference of the maximum of present patent application two are injected cylinders and have an injection nozzle that separates, therefore can injection moulding to two a different molding unit on.Be injected in one and the same injection nozzle if inject cylinder, at least one second valve is set in the melt pipe at Coinjection molding apparatus to the carrier pipe that injects nozzle so, this implements with expending.

Summary of the invention

Therefore the objective of the invention is to, a kind of Coinjection molding apparatus is provided, wherein do not produce dead volume and make with expending and move as far as possible simply and less in addition.

The Coinjection molding apparatus of this feature by having claim 1 is realized.

The big advantage of common this injection (mo(u)lding) machine is short cycle time, realizes by two injection cylinders in the injection moulding side described cycle time.Do not have material and melt in one and same melt canal, to move around by the present invention equally, but prevent dead volume by each two passage that be arranged in parallel that inject cylinder.

A form of implementation setting, valve is a rotary valve, it can be by rotation conversion between the two positions.But in this relation, need to mention, also can adopt the valve of other form or a revolving valve also to can be used as this valve.Cylinder is injected in one first of filling in the primary importance of valve, injects and inject cylinder by this in the second place.Load and inject at the second injection cylinder when first injects the cylinder end in contrast.

By a kind of form of implementation setting of Coinjection molding apparatus of the present invention, valve has the interface channel of two preferred upper and lower settings in addition.By two interface channels that separate in valve or groove, an interface channel is used for filling and injects cylinder, and another interface channel is used for injecting cylinder by one second and injects.

Another form of implementation is provided with, and valve constitutes guiding valve, and it can be by the conversion between the two positions of sliding.Can vertically move at this valve.

Guiding valve can have the interface channel of four upper and lower settings in the form of implementation of just having mentioned.

Description of drawings

Explain other details of the present invention and advantage below with reference to the embodiment that is described in the drawings in detail by means of the description of the drawings.Wherein:

Fig. 1 shows the cutaway view of top pipe,

Fig. 2 shows the cutaway view of following pipe,

Fig. 3 shows the vertical cutaway view of valve and all pipe,

Fig. 4 a shows the perspective view of injection cylinder together with pipe and rotary valve,

Fig. 4 b shows the cutaway view of the signal of injecting cylinder and pipe,

Fig. 4 c shows the structure of the signal of valve,

Fig. 5 shows the cutaway view of whole injection device,

Fig. 6 a is presented at the vertical cutaway view of the valve that constitutes guiding valve in the second place,

Fig. 6 b is presented at the vertical cutaway view of the valve that constitutes guiding valve in the primary importance.

The specific embodiment

Fig. 1 shows the part of injection device 10, comprises that first injects cylinder 1 and the second injection cylinder 2, extruder 3, injection nozzle 4, valve 6 and pipe 5a, 5c and 5e.Therefore valve is used for the second fill channel 9a that injects cylinder 2 injects cylinder 2 by the top interface channel 8a and second of extruder pipe 5e, valve 6 top pipe 5c formation in the second place in this case.Accompanying drawing shows that injecting cylinder 2 does not also load with solution 7.The extruder 3 of the continuous operation by having electric driver 11 (not describing at this), cylinder 2 usefulness melts 7 load continuously and the piston 13 of back pressure injection cylinder 2 thereby inject in the second place.Inject the position locking of the top pipe 5a of cylinder 1 by valve 6.

Fig. 2 shows as the cutaway view of the pipe 5 below the injection device 10 during the identical moment in Fig. 1, thus the same in this case visible second place.Interface channel 8b below pipe 5b below this injection channel 9b passes through injection cylinder 1, the valve 6 and injection blast tube 5f constitute.Inject the position locking of the following pipe 5d of cylinder 2 by valve.

Fig. 3 shows the vertical cutaway view of Coinjection molding apparatus 10, wherein is provided with in the zone of on the left side to inject cylinder 1, extruder 3 and zone on the right are set in the centre are provided with and inject cylinder 2.In the zone of centre, constitute two pipes that extend in parallel 5 that inject cylinder 1 and 2.Valve 6 is in primary importance in this case, therefore inject cylinder 1 and load with melt, and be pressed onto in the injection nozzle 4 (describing) by following pipe 5d and following interface channel 8b and injection blast tube 5f (describing) via injecting cylinder 2 melts by top interface channel 8a and top pipe 5a.Visible two interface channel 8a and 8b in valve 6, they constitute apart from each other and layer shape ground is provided with.Pipe 5c in this position above the locking and below pipe 5b.A pipe (5a or 5b, 5c or 5d) that only injects

cylinder

1 and 2 in any position of valve 6 is connected with one of 8b with two interface channel 8a of valve 6.Interface channel 8a of valve 6 or 8b constitute the part of fill channel 9a, and another interface channel 8b or 8a constitute the part of injection channel 9b.Following inventory is used for better explanation:

5a injects the top pipe of cylinder 1

5b injects the following pipe of cylinder 1

5c injects the top pipe of cylinder 2

5d injects the following pipe of cylinder 2

The extruder pipe of 5e extruder 3

The injection blast tube of 5f in injecting nozzle 4

The top interface channel of 8a valve 6

The following interface channel of 8b valve 6

The 9a fill channel

The 9b injection channel

Fig. 4 a shows two

injection cylinders

1 and 2 with pipe 5 and rotary valve 6, and wherein the function of top and following pipe is just opposite with the example that shows before this in this case.Top-right in this case pipe 5c is used as the injection channel, and the pipe 5b in the lower left is used as the fill channel of injecting cylinder 1.Usually pipe 5 also can be set up in parallel.

Fig. 4 b shows the cutaway view of the pipe of Fig. 4 a.

Schematically describe in Fig. 4 c, how valve 6 separates interface channel and injection channel.

Fig. 5 is presented at the valve 6 in the second place, and this valve constitutes revolving valve in this case.Auger conveyor 12 by motor 11 extruder 3 of Continuous Drive in the zone of back is transported to melt 7 in the injection cylinder 2.Injecting cylinder 1 when identical moment carries out and injects.

In a kind of preferred form of implementation, the conversion of valve 6 realizes by half-twist and during the plasticizing processing of extruder.In a kind of preferred form of implementation, very little (the AA content＜5ppm) of the quantity of material in tube connector or melt canal.

Describe a kind of form of implementation of Coinjection molding apparatus in Fig. 6 a and 6b, wherein valve 6 constitutes guiding valve.Guiding valve has the interface channel 8a and the 8b of four upper and lower settings.Be presented at guiding valve in the second place at this Fig. 6 a, and Fig. 6 b is presented at the guiding valve in the primary importance.Interface channel 8b below interface channel 8a above two and two is set in this form of implementation of Coinjection molding apparatus, wherein (according to the position of valve) always only one of two interface channel 8a constitute the part of fill channel 9a and always only one of two interface channel 8b constitute the part of injection channel 9b.

Claims

1. Coinjection molding apparatus comprises:

Extruder, especially a screw extruder;

One first is injected cylinder and one second injection cylinder;

One is injected nozzle;

Each injects two pipes of cylinder, and the first injection cylinder and second injects cylinder and can be connected with the injection nozzle with extruder respectively by described pipe; And

A valve;

It is characterized in that: valve (6) has two positions, wherein in the primary importance of valve (6), first injects one of two pipes (5) of cylinder (1) is used as fill channel (9a) in order to loading this injections cylinder (1) by extruder (3), and one of two pipes (5) of the second injection cylinder (2) are used as injection channel (9b) in order to melt (7) is injected in the injection nozzle (4) by injection cylinder (2); And in the second place of valve (6), second another of two pipes (5) that injects cylinder (2) is used as fill channel (9a) in order to loading this injections cylinder (2) by extruder (3), and another of two pipes (5) of the first injection cylinder (1) is used as injection channel (9b) in order to melt (7) is injected in the injection nozzle (4) by injection cylinder (1).

2. by the described Coinjection molding apparatus of claim 1, it is characterized in that: valve (6) is a rotary valve, and this rotary valve can be by rotation conversion between the two positions.

3. by claim 1 or 2 described Coinjection molding apparatus, it is characterized in that: valve (6) has the interface channel (8) of two upper and lower settings.

4. by the described Coinjection molding apparatus of claim 1, it is characterized in that: valve (6) constitutes guiding valve, and this guiding valve can be by the conversion between the two positions of sliding.

5. by the described Coinjection molding apparatus of claim 4, it is characterized in that: valve (6) has the interface channel (8a, 8b) of four upper and lower settings.