CN1063443A

CN1063443A - The Coinjection molding apparatus that in the front portion of nozzle, has whole cooling

Info

Publication number: CN1063443A
Application number: CN 92100394
Authority: CN
Inventors: 乔布斯特·乌尔里克·盖勒特
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-01-25
Filing date: 1992-01-23
Publication date: 1992-08-12

Abstract

A kind of Coinjection molding apparatus that has whole heating and cooling in the front portion of the nozzle that is adjacent to cast gate, the cooling fluid pipe insulating air layer around passing extends to the problem of expanding with heat and contract with cold with minimizing in the front portion of said nozzle.The seat ring of an open loop type is seated in the cavity plate and extends and crosses insulating air layer to load onto said nozzle.This seat ring has an outer opening to be used for the cooling fluid pipe from passing therebetween.And the cooling fluid pipe is connected to corresponding inlet and the exit passageway in the front portion of nozzle and extend to a cooling liquid flowing channel so that cooling fluid stream to be provided.

Description

The Coinjection molding apparatus that in the front portion of nozzle, has whole cooling

The present invention relates to injection moulding in general, more specifically to a kind of Coinjection molding apparatus that has whole cooling in the front portion of nozzle.

As everyone knows, it is successfully moved is critical to the thermodynamic property of hot runner injection molding apparatus or device.This more has really when temperature had the material of harsher requirement using more, when being used for temperature and increasing or during hot runner, and even it is certain more especially.Nozzle with whole electric insulation heating element heater is known, and nearer example sees Canadian Patent 2,030, the 286 " injection molded nozzles with the tilted conical heating element heater that is adjacent to the duct by name that the applicant submitted November 19 nineteen ninety.”

Recently, the control of improved temperature realizes, this is owing to provide due to the cooling around the front end of nozzle.These examples are found in the Bu Laide people's such as (Bright) who published on November 11st, 1986 U.S. Patent number 4,622,001, the applicant's that publish March 27 nineteen ninety U.S. Patent number 4,911,636, the Canadian Patent 606 of the Standard Module company that on December 5th, 1988 submitted, 082 " injection molding apparatus " by name with liquid cools inserts, and July 27 nineteen ninety the applicant of submitting Canadian Patent 2, person described in 022,120 " the injection moulding cooling collar bearing that is used for warmed-up nozzle " by name.Yet all these devices all have shortcoming, and this is owing to need an extra inserts or parts to provide cooling round said nozzle.The nozzle that the U.S. Patent number 4,687,613 of the Chu Tesami (Tsutsumi) that on August 18th, 1987 published shows a pattern has whole heating and cooling.Yet, except being difficult to manufacturing, even be not the words that impossible make, the shortcoming of this device is, whole cooling liquid runner is from flowing near the rear end of nozzle near the front end, and particularly when being applied to temperature and increasing or heat when washing mouthful, this has just caused the excessive problem of expanding with heat and contract with cold.

So, the objective of the invention is to overcome the shortcoming of prior art to small part, this is by a kind of Coinjection molding apparatus is provided, in this device, have outside cooling liquid inlet in the front portion of nozzle and extend through the air layer of a thermal insulation round this nozzle, thereby reach whole cooling with the outlet pipe.

For this reason, one of its characteristics are, the invention provides a Coinjection molding apparatus, this device has a nozzle, this nozzle is received in the pit in the cavity plate and an insulating air layer configuration is arranged therebetween, this nozzle has a mid portion at the rear portion that is adjacent to the rear end be adjacent between the front portion of front end and extending, this nozzle also has a center melting hole and extends through from its rear end and reach its front end therebetween, this nozzle has the electric insulation heating element heater of an integral body, this heating element heater has the anterior interior melting hole extension of a front portion round nozzle, this nozzle also has a cooling liquid flowing channel to extend round the anterior interior melting hole of nozzle basically, its improvements are, the front portion of this nozzle has an inlet passage and an exit passageway to extend to described cooling liquid flowing channel, and corresponding inlet path and the cooling fluid stream of exit passageway to provide one to wear this described cooling liquid flowing channel in the front portion of the arrival of the air layer between nozzle and the cavity plate on every side at nozzle are provided for cooling liquid inlet and outlet pipe.

Other purposes of the present invention and advantage describe conjunction with figs. in detail in following description.

Brief Description Of Drawings:

Fig. 1 is the cutaway view of the part of a multiple-cavity injecting forming system, shows most preferred embodiment of the present invention;

Fig. 2 is along the profile of 2-2 line among Fig. 1;

The axonometric drawing of seat ring shown in Fig. 3 Fig. 1;

Fig. 4 is the cutaway view of the present invention in different application.

At first see also Fig. 1, there is shown the nozzle 10 of one of a plurality of nozzles in a multiple-cavity injecting forming system.Each nozzle 10 has a mid portion 12 that has cylindrical outer surface 14, and this outer surface 14 is extending between a rear portion 16 and a front portion 18.These parts are that be formed from steel and together integral braze-welded, as the Canadian Patent of submitting November 19 nineteen ninety aforesaid the applicant 2,030, person described in 286.Center melting hole 20 extends through this

nozzle

10 and 22 arrives its front ends 24 from its rear end.These melting hole 20 some 26 tapers towards the cast gate 28 and the die cavity 30 that leads.

Described nozzle 10 is heated by the heating element heater 32 of the electric insulation of an integral body.Heating element heater 32 has a rear portion 34, and this rear portion 34 extends outwardly on cold power connection end 36, and heating element heater 32 also has a front portion 38, and is extending round the melting hole 20 in the front portion 18 of nozzle 10 this front portion 38.In the present embodiment, the front portion 38 of this heating element heater 32 by have uniform rectangle cross section in connection with several coils make tilted conical, as the Canadian Patent of submitting November 19 nineteen ninety aforesaid the applicant 2,030, person described in 286.

Described nozzle 10 is fastened on the shared elongated melt distribution manifold parts 44 by bolt 42, this manifold 44 has a melt flow channel 46, this melt flow channel 46 is branched off into several outlets 48, and each outlet 48 aligns with one of them the center melting hole 20 that passes those nozzles 10.Described manifold 44 is located by an interfix ring 54 and a flexible shim elements 56 between the plate 52 behind a cavity plate 50 and one securely.Described back plate 52 is on the throne by bolt 58 clampings, and this bolt 58 extends through a support plate 60 and enters into cavity plate 50.Described cavity plate 50 and back plate 52 are cooled off by passing the next cooling water of cooling duct 62 pumps.Described manifold 44 is heated by an electrical heating elements 64 that is cast into wherein, as the U.S. Patent number of publishing on August 25th, 1,987 4,688 the applicant, person described in 622.Locating ring 54 and shim elements 56 provide at the manifold 44 that has been heated and cavity plate 50 that has been cooled and insulating air layer 66 between the plate 52 of back.

The nozzle 10 that has been heated is seated in the pit 68 in the cavity plate 50 that has been cooled, and an air layer 70 is arranged so that heat insulation effect to be provided between them.In the present embodiment, there is the insulating flange 72 of an annular at the rear portion 16 of nozzle 10, and this insulating flange 72 is encased in the stand 74 in the rear surface 76 of seat ring 78 of an annular.And seat ring 78 has 80 of front surfaces to come on the shoulder that extends internally 82 on the wall 84 of the pit 68 in the cavity plate 50.Described seat ring 78 has a centre bore 86 to pass through therebetween to pass through wherein and provide thus insulating air layer 66 with the mid portion 12 of accepting nozzle 10.Shown in 3, this seat ring 78 is open loops of being made up of the part 88 of two separation, and the part 88 of these two separation is installed into together between the larger-diameter rear portion of nozzle and anterior 16,18 mid portion 12 round nozzle 10.

As illustrated in fig. 1 and 2, there is the cooling liquid flowing channel 90 of an annular front portion 18 of described nozzle 10, and this cooling liquid flowing channel 90 extends round center melting hole 20, and a narrower partition wall 92 is just arranged.There are import and

exit passageway

94,96 in the front portion 18 of described nozzle 10, and this import and

exit passageway

94,96 extend to described annular cooling liquid flowing channel 90 on two opposites of described partition wall 92.Described import and

exit passageway

94,96 usefulness screw threads are connected respectively on the joint 98, this joint 98 is connected with outlet pipe 100,102 from cooling liquid inlet made of copper, and the control source (not shown) that this import and outlet pipe extend through a cooling fluid of described air layer 70 arrival is water for example.Described import and outlet pipe 100,102 are worn in public from the outside at the rear portion 16 of seat ring 78 outer opening 104 and nozzle 10.In the present embodiment, wall 84 processed elongated slots 106 of pit 68 be used in particular for packing into described import and the outlet pipe 100,102 pass through the rear portion 16 of described nozzle 10 so that a gap to be provided.Cooling liquid flowing channel 90 in the front portion 18 of said nozzle 10 extends round the outside of said heating element heater front portion 38.The partition wall portion 92 of front portion 18 that thermocouple 103 also extends through described air layer 70 and enters into nozzle 10 in the outer opening 104 of seat ring 78 is with monitoring operating temperature during use.

In use, this system assembles up as shown in Figure 1, and they are heated to an operating temperature of predesignating, this temperature depends on the material of moulding to power connection to the heating element heater 32 of each nozzle 10 and the heating element heater in manifold 44 64.For the cast gate that provides hot runner or temperature to increase, receive the power supply of heating element heater 32 and the cooling fluid stream by cooling liquid flowing channel is controlled, this control and the pressurized melt that penetrates from a make-up machine (not shown) enter into that operation cycle of the melt flow channel 46 of passing import 108 combines.In short time before opening, heating is cut off and then cools off and freeze cast gate in order to take out product wherein at mould.When mould closes when injecting next time, cooling is cut off and power supply is pulled to the melt that heating element heater 32 has been solidified in cast gate 28 with heating again, when injection pressure applies up again, so that cast gate 28 reopens immediately.Pressurized melt flow through in each nozzle 10 melt flow channel 46 and cast gate 28 and fill up die cavity 30.After die cavity was filled, injection pressure was held a short time to compress melt, unclamps then.After a cooling cycle in short-term, mould is opened and takes out the product of moulding.Carry out with a frequency continuously again and again, this frequency depends on the kind of the size and dimension and the moulding material of die cavity.

See also shown in Figure 4ly, show a formation structure that piles up shape and be used for melt transported and pass a parting line 110.This structure is similar to the applicant's the U.S. Patent number of publishing January 2 nineteen ninety 4,891, person described in 001, just upstream and downstream nozzle 112,114 has in their front portion as previously discussed that identical measure is used for controlling heating and cooling among Fig. 1-3.This upstream nozzle 112 is located in the pit 116 in the fixing mould platen 118, and this downstream nozzle 114 then is located in one movably in the pit 120 in the mould platen 122.After melt flow channel 124 is passed this upstream and downstream nozzle 112,114, just this movably in the distribution manifold parts 126 in the mould platen 122 branch go out and arrive die cavities 130 by several other nozzle 128 to transport melt.Because the structure of this upstream and downstream nozzle 112,114 repeats no more with identical as previously mentioned.

In use, this system assembles up as shown in the figure, and according to a cycle of predesignating, heating and cooling are applied to this upstream and downstream nozzle 112,114 and get on.This cycle is to decide by the cycle that an import 132 enters into melt flow channel 124 according to the melt that has pressurizeed from injecting of a make-up machine (not showing among the figure).When mould as shown in the figure in closing position the time, heating is switched on and cools off and be disconnected on this upstream and downstream nozzle 112,114, and the melt that has then pressurizeed flows to this downstream nozzle 114 and crosses parting line 110 and pass melt flow channel 124 from this upstream nozzle 112 and arrives various die cavities 130.After die cavity 130 is filled, before mould is opened with the product that takes out moulding, heats in the short time and be cut off and cool off and begin to carry out.After taking out product, mould is by closed again, and this cycle is being repeated continuously.The so controlled heating and cooling of use can reduce cycle time and guarantee the normal running of this system in this upstream and downstream nozzle 112,114 anterior.

Although provide the device of whole cooling to describe as above in the front portion of nozzle, this should not be considered as having the meaning of restriction.For the professional who is familiar with the industry, various modification and variation can be arranged.For example, the size and dimension of nozzle 10 and seat ring 78 can be different in different application.Cooling liquid flowing channel 90 in the front portion 18 of nozzle, the size and dimension of partition wall portion 92 and import and

exit passageway

94,96 also can be made marked change.Operation cycle can be in the different time by control to the heating of nozzle and or cooling change.Cooling can be just by blocking the cooling water flow that passes cooling liquid flowing channel 90 or being controlled by removing water.Claims of the present invention institute restricted portion will be enough to cover all these modification.

Claims

1, the Coinjection molding apparatus that in the front portion of nozzle, has whole cooling, has a nozzle, this nozzle is received in the pit in the cavity plate and an insulating air layer configuration is arranged therebetween, said nozzle has a rear end, a front end and a mid portion, this mid portion is at the rear portion that is adjacent to the rear end and be adjacent between the front portion of front end and extending, this nozzle also has a center melting hole and extends through from its rear end and arrive its front end therebetween, said nozzle has the electric insulation heating element heater of an integral body, this heating element heater has the anterior interior melting hole extension of a front portion round nozzle, said nozzle also has a cooling liquid flowing channel to extend round the anterior interior melting hole of said nozzle basically, it is characterized in that:

The former front portion of said nozzle has an inlet passage and an exit passageway to extend to said cooling liquid flowing channel, and corresponding inlet path and the cooling fluid stream of exit passageway to provide one to pass said cooling liquid flowing channel in the front portion of the arrival of the air layer between said nozzle and the cavity plate on every side at said nozzle are provided for cooling liquid inlet and outlet pipe.

2, according to the Coinjection molding apparatus of claim 1, it is characterized in that,

Said pit in cavity plate has a wall with the shoulder that extends internally, the mid portion of said nozzle extends through the central opening in a seat ring, and said seat ring has a front surface and a rear surface, said front surface is on the said shoulder that extends internally that rests against on the interior wall of the interior pit of said cavity plate, the rear surface of said seat ring forms the bearing that can accept the rear portion of said nozzle, said seat ring also has an outer opening, and said cooling fluid pipe extends through this opening.

According to the Coinjection molding apparatus of claim 2, it is characterized in that 3, said seat ring is an open loop.

According to the Coinjection molding apparatus of claim 3, it is characterized in that 4, the cooling liquid flowing channel in the front portion of said nozzle extends round the outside of the front portion of said heating element heater.