CN1807059A - Forming method of hollow plastic product and related apparatus - Google Patents
Forming method of hollow plastic product and related apparatus Download PDFInfo
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- CN1807059A CN1807059A CN 200510002095 CN200510002095A CN1807059A CN 1807059 A CN1807059 A CN 1807059A CN 200510002095 CN200510002095 CN 200510002095 CN 200510002095 A CN200510002095 A CN 200510002095A CN 1807059 A CN1807059 A CN 1807059A
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Abstract
The invention relates a hollow plastic product forming method and device, specially the method and device, controlled spew cavity, used to produce the sheet plastic products containing structural reinforcement with gas auxiliary ejection forming technique. The method comprises the following steps: injecting the melting plastic into mold impression, continuous pushing material into mold impression to maintain press, then leading the controlled pressured gas/liquid into melting plastic with gas/liquid control device, the injection machine injection machine screw driving the melting plastic into cavity from which the control piston is just exited, controlling the movement and position of controlled pressured gas/liquid press and control piston to make the gas enter the plastic inside, keeping the gas press, and making the plastic cure in the cavity.
Description
Technical field
The present invention relates to a kind of manufacturing process of hollow plastic product and related device, particularly a kind of method and related device---controlled material overflow cavity that utilizes the thin plate class plastic products that gas assisted injection molding technology production contains the structure gusset.
Technical background
The Ernst Friederich of Germany Rohm GmbH is the people of first invention air-auxiliary injection forming process.The disclosed patent No. of Germany Patent document in 1975 is a kind of forming method of thermoplastic being made hollow product by injection moulding of 2501314, the method that this patent documentation discloses comprises uses injection nozzle enough fused materials to be expelled in the mould of ready prepd above-mentioned hollow product, and the gas that will pressurize makes fused materials fully contact with mould inner surface in the middle of also being injected into fused materials by the hole on the said nozzle then.So in above-mentioned mould, in the middle of the gas injection is entered goods, form hollow product, goods are cooled off, be cooled to below the softening temperature, the goods internal pressure is equated with ambient pressure, open mould then and take out goods.The calibrating gas auxiliary injection forming process also claims to owe the material injection.Only charge into the partly plastic melt in the mould, and there is no need to be full of fully.After plastics inject, injecting gas immediately or after a while.Mould only relies on gas pressure that melt is full of fully, in order to guarantee that gas does not penetrate the melt forward, should inject the plastics of q.s before injecting gas, described method mainly is applicable to moulding stick class and plate based article, and is not suitable for thin plate class plastic products.In the another kind of gas auxiliary injection forming technology, mold cavity is full of fully by plastic melt, then gas is injected.In the die cavity plastic melt made but process, gas entered the volume that reduces owing to die cavity plastic melt volume contraction, and this method is very little owing to the volume that the plastic melt volume contraction in the die cavity reduces in practice, so there is not actual use value.At a kind of gas auxiliary injection forming technology is that the film chamber all is full of, and pushes some melts to another one cavity, promptly so-called spill cavity by injecting gas then.This technology has been used about 30 years history, but explores the optimization and the improvement of its technology again according to different people's unanimities of production product.Spill cavity is used for controlling flowing of core material, thereby realizes the even distribution of core material.Such as, a control valve can be set between die cavity and spill cavity, when use has the spill cavity technology of control valve control, can injection moulding contain the became uneven plate-shaped products of big airways, but in die manufacture, the spill cavity volume is corresponding with the volume of the plastic melt that is discharged from the people.Because discharging the volume of melt before test and moulding can't accurately calculate.So, after beginning or the test of pattern checking afterwards, need adjust the volume of spill cavity repeatedly, bring great inconvenience to Mould Machining like this, and the variation of plastic material, the height of melt temperature in the technology, the make-up machine parameter change, die cavity temperature height, gas promotes the discharge time started of molten plastic in the thicker position of die cavity and the interval of injected plastic time, discharge time length etc. are what of the row's of having influence on load all, promptly influence the volume of spill cavity, spill cavity is to connect by one section passage aisle with being connected of die cavity, general control valve device is small plunger and the control device thereof that blocks passage aisle by, control system is formed, control section can promptly be controlled the switch of passage aisle mobile small plunger position, in explained hereafter, plastic melt is behind contact die cavity wall, form solidification layer, and easier the solidifying of small plunger position melt, when small plunger is opened after both control valve had been opened, need to inject than atmospheric pressure, just can make the plastics inner melt break through small plunger position melt solidifying layer, flow into spill cavity, after the molten plastic melt begins to flow into spill cavity, the melt leading peak just loses resistance, cause gas moment that die cavity plastic core melt is pushed spill cavity, gas pressure forms plastics in the chamber at last and impacts, make gas penetration product thin-walled layer easily than atmospheric pressure and impact, cause product strength to reduce, and product surface has obvious gas trace defective, or make gas return barrel, cause easily to produce and interrupt, in addition, also can waste the gas energy than hyperbar.
Summary of the invention
So the object of the invention in the many weak points according to above-mentioned prior art, proposes a kind ofly to utilize gas assisted injection molding technology that controlled material overflow cavity device is set on mould and utilize the production of this device that the method for the thin plate class plastic products of structure gusset (comprising screw post, reinforcement etc.) is arranged.Concretely: the object of the invention is to provide a kind of technology and device that is used for injection-moulding plastic, the production that is used for more optimizing contain than big airways, contain irregular than big airways, contain at least one than big airways, contain the tabular based article of at least one irregular uneven distribution than big airways.
The object of the invention realizes being finished by technical scheme
The forming method of a kind of hollow plastic product of the present invention may further comprise the steps at least:
A. by screw in injection molding machine melted plastic material is injected in the mould in the die cavity, makes to be full of or to be full of substantially melted plastic material in the die cavity; B. immediately, screw in injection molding machine continues pusher in mold cavity, makes 2.5～6 seconds of mold cavity pressurize; C. during the pressurize of screw in injection molding machine pusher, the controllable piston of control material overflow cavity withdraws from a section and moves, and makes screw in injection molding machine promote that controllable piston that molten plastic in the die cavity enters the control material overflow cavity withdraws from and in the cavity vacated; D. immediately, controlled gas-pressurized/liquid is imported in the melted plastic material in the above-mentioned die cavity by air inlet/hydraulic control system device, promote further that controllable piston that molten plastic in the inner plastics of above-mentioned die cavity enters the control material overflow cavity continues to withdraw from and in the cavity vacated; E. control moving and the position of controlled pressurization gas/liquid body pressure and material overflow cavity controllable piston, make controlled gas-pressurized fully enter the plastics inner of thicker position section in the die cavity, and keep gas pressure, plastics are solidified in die cavity; F. behind the interior plastics solidification of the interior die cavity of mould, the gas/liquid of will pressurizeing body is discharged die cavity, opens mould, takes out plastic products.
The described step that melted plastic material is injected in the mold cavity is to carry out under the situation of no plastics in the die cavity in this mould; Described material overflow cavity is a hydraulic cylinder or electronic or arbitrary traditional piston stroke controlled, and makes the volume size of material overflow cavity to control, and can controlled pressure and displacement when initial flash enters; The pressure of piston and action time are complementary in the propelling pressure of described screw in injection molding machine and action time and the material overflow cavity, make that the molten plastic in the mold cavity enters material overflow cavity under certain pressure; End in the described material overflow cavity is stepped; Described material overflow cavity one end and mold cavity junction be intracavity section long-pending be 1～20mm
2, length is the less strip cavity of 1～5mm, in material overflow cavity and with strip die cavity joining place be that an inner chamber is that sectional area is 25～100 mm
2, length is the strip cavity of 3～10mm, this strip cavity and material overflow cavity and less strip cavity form stepped; The flash of described initial discharge is by the pressure of piston in the propelling pressure of screw in injection molding machine and action time and the material overflow cavity and is complementary action time and realizes, is discharged to the plastics control gas/liquid body pressure in the material overflow cavity afterwards and realizes action time; The plastic products that described forming method is made form cavity in the middle of the thicker position of one section; On the described mould one or more material overflow cavity can be set, the piston action of each material overflow cavity is to control by the oil pressure control system of injection machine or external oil pressure control system, external electronic control system etc.
Advantage of the present invention is owing to adopt controlled material overflow cavity technology and optimize technology, so when production contains the thin plate class plastic products of structure gusset, obviously improve with like product technology comparative product qualification rate, substantially do not have to shrink or slight crack at the thicker position of product, can improve the production efficiency of goods simultaneously greatly.The discharge gate of product is very little, and the thin plate of product place own does not have the phenomenon that gas disorderly pours.In explained hereafter, the size of control output gas pressure is controlled little many of output gas pressure than traditional handicraft, thereby causes multinomial benefit, as reduces air consumption, prolongs the auxiliary injection device life-span of gas, prolongs die life etc.
Description of drawings
Fig. 1 illustrates in the process of the present invention, the original state of injecting machine material tube, mold cavity and controlled material overflow cavity.
Fig. 2 is the profile of mold cavity A-A direction in the schematic diagram 1.
Fig. 3 illustrates injection machine in the process of the present invention to inject the state of molten plastic in mold cavity.
Fig. 4 illustrate in the process of the present invention injection machine continue in mold cavity, to inject molten plastic and, the state that controlled material overflow cavity piston has moved.
The profile of mold cavity A-A direction in Fig. 5 schematic diagram 4.
The process that Fig. 6 illustrates injection machine in the process of the present invention to continue to inject molten plastic in mold cavity stops, and controlled gases at high pressure begin to inject the state that controlled material overflow cavity piston continues to withdraw from.
Fig. 7 illustrates that controlled gases at high pressure continue to inject in the process of the present invention, and controlled material overflow cavity piston is withdrawn into the state of ultimate position.
The profile of mold cavity A-A direction in Fig. 8 schematic diagram 7.
Fig. 9 illustrates the state that controlled gases at high pressure are discharged from mold cavity in the process of the present invention.
Figure 10 is shown as die cavity internal pressure time variation diagram.
The specific embodiment
Below in conjunction with accompanying drawing feature of the present invention and other correlated characteristic are described in further detail:
Present embodiment is that 2～6 millimeters plate based article describes with products thickness.
Referring to the molten plastic in the 5 expression injecting machine material tubes of label among Fig. 1, these plastics are any thermoplastic materials that can be used for injection mo(u)lding; The material storage tube of label 1 expression injection machine; The injection barrel of 2 expression injection machines; Label 4 expression injection barrel inner screws; Label 3 expression nozzles; Injection machine can be any type injection machine, as screw or bar plug formula; Label 6 expressions one mold cavity; Die cavity 6 can be traditional any injection mold cavity; Label 7 expression moulds; Label 9,10 represent respectively mold cavity and controlled material overflow cavity adjacent connector.Wherein, connector 9 is that sectional area is less, is 1～20mm
2, length is the less strip cavity of 1～5mm, connector 10 is that sectional area is bigger, is 25～100mm
2, length be 3～10 millimeters greatly enhance strip cavity, an inlet duct that is connected with die cavity 6 on the label 8 expression moulds can be any traditional mechanism, as air tube, movable air tube etc.; The controlled material overflow cavity piston of label 11 signals is by an oil cylinder 12 controls; Injection machine injection barrel 2 is connected with mold cavity 6 by nozzle 3; Inlet duct 8 is positioned at an end of 6 one sections thicker positions of die cavity, and connector 9 is positioned at the other end of thicker position.
Referring to Fig. 2, a thicker fragment position in the connector 14 expression die cavities, sectional area is preferably near circular shape, and its sectional area is 36～150mm
2, length is greater than 100mm; A screw post position or gusset position in the label 13 expression die cavities.
Below set forth the concrete steps of technology:
The first step, referring to Fig. 3, injection machine will be injected the interior molten plastic 5 of barrel and promote by screw rod 4, be injected in the mold cavity 6, in this step, injection machine pressurizes to screw rod, the molten plastic that screw in injection molding machine 4 promotes in the barrel enters mold cavity 6, makes to be full of or to be full of molten plastic in the mold cavity substantially, and screw in injection molding machine should leave a fragment position X (can be 3～50 millimeters), so that in further moving, screw in injection molding machine continues pusher in mold cavity.
Second step, referring to Fig. 4, a shoot material inner screw 4 of injection machine continues to promote molten plastics 5 and enters into mold cavity 6, replenish the volume that molten plastic reduces because of volume contraction in cooling procedure in the mold cavity 6, particularly the position 14, in this course, injection machine is pressurized to 60～120Mpa to screw rod, the molten plastic that screw in injection molding machine 4 promotes forward in the barrel again enters in the process of mold cavity 6, piston initial position in the controlled material overflow cavity is in the closed position, at this moment, piston in the controlled material overflow cavity slowly retreats under the control less than injection pressure, by the pressure of injection machine, the piston 11 that the plastic core molten plastic enters because of controlled material overflow cavity in the mold cavity is withdrawed from the cavity of vacating, 15 expression material overflow cavities to screw rod.
Technology of the present invention is different from traditional gas-assisted injection molding technology, in the auxilliary technology of traditional gas, injection machine to has annotated in the mold cavity expect after, can be not again with injection machine by screw rod pusher in mold cavity.The surface pitting that position 13 place's plastic shrink cause can't solve, and has only by gas to enter 13 inside, plastics position, solves surface pitting by the gas pressurize in cooling procedure, but can cause product surface gas trace and intensity decline problem like this.And in the process of the present invention, be to promote molten plastic by screw in injection molding machine to enter mold cavity 6 inside, replenish the volume that molten plastic reduces because of volume contraction in cooling procedure, particularly the position 13, solve its surface pitting, and do not influence product strength.
Referring to Fig. 5, be full of molten plastic in the mold cavity
The 3rd step referring to Fig. 6, made molten plastic very short time from the process that discharge gate has begun to discharge or afterwards, and control controllable pressure gas enters mold cavity position 14 plastic core by inlet duct 8.
Technology of the present invention is different from traditional gas-assisted injection molding technology, in the auxilliary technology of traditional gas, discharge gate is directly to lead to material overflow cavity, also can control the break-make of discharge gate by valve, and mold cavity enters die cavity to the discharge of material overflow cavity and promotes in the die cavity molten plastic and finish by gas.As everyone knows, the sectional area of discharge gate is less, to reduce the local defect of finished product, injected behind the die cavity and carried out after a period of time and gas injection generally is a molten plastic, the discharge gate of this moment solidifies, die cavity inner core molten plastic is drained in the material overflow cavity, need to break through the solidification layer of discharge gate, so need to inject in the die cavity than atmospheric pressure, as 28Mpa, and run helter-skelter in the die cavity plastic core easily than atmospheric pressure, make gas return barrel or enter thin-walled place in the product, cause to produce and interrupt or the gas trace appears in product surface or product strength is not enough.
And discharge of the present invention passes through a fragment position 10, and these 10 cross sections, position and length are bigger, can alleviate the curing of molten plastic at discharge gate, effectively reduce the discharge resistance.On the other hand, in the technology of the present invention, the discharge of the interior plastics of die cavity is to finish under the pressure of screw in injection molding machine piston in its injection machine pressure effect and material overflow cavity itself is controlled, screw in injection molding machine pressure 140Mpa is much larger than controlled gas-pressurized pressure 350bar, easier the mold cavity plastics are applied active force, die cavity inner core molten plastic is drained in the material overflow cavity.
Molten plastic touches the formation solidification layer of die cavity wall in the die cavity, but thicker position 14 still is fusion than the thickness portion core, very short time the process that molten plastic has begun to discharge from discharge gate or afterwards, control controllable pressure gas enters by inlet duct 8, at this moment, the controlled value (as 10Mpa) that adds the pressure of calming the anger is much smaller the phenomenon of effectively having avoided gases at high pressure to run helter-skelter than gas pressure value (as 15Mpa) in the auxilliary technology of traditional gas in molten plastic.
The 4th step, referring to Fig. 7,, to control controlled material overflow cavity piston and slowly withdraw from by the oil pressure and the speed of control control device, controlled gas-pressurized is injected into 14 inside, position in the mold cavity 6, promotes molten plastic and continues to discharge from the discharge capacity mouth.The motion of control controllable pressure gas value and material overflow cavity piston in this process, controlled gas-pressurized is injected into 14 inside, position in the mold cavity 6 stably, control controlled material overflow cavity position of piston, can make the even penetration site 14 inner plastics of controlled gas-pressurized, keep controlled gas-pressurized pressure, continue the volume that supplementary is vacated because of the melt volume contraction in cooling procedure, guarantee that the die cavity wall is close on the surface of plastics in the die cavity.So that better to the product repeat replication, after this, plastics cool off in mold cavity, solidify.
In a single day the discharge gate of tradition material overflow cavity is opened, molten plastic is discharged rapidly in the die cavity, cause the die cavity internal gas pressure to produce impact variation, cause gas to return barrel easily or gas charges into the thin-walled portion that should not charge in product, and the present invention is in this process, the motion of control controllable pressure gas value and material overflow cavity piston, controlled gas-pressurized is injected into the core of thicker plastics in the mold cavity 6 stably, has effectively avoided this phenomenon.
In the auxilliary technology of tradition gas, the volume of the part amount material of discharging is that direct size by material overflow cavity determines, what of row's load are all multifactor relevant with the thickness of the character of mould temperature, plastic material, solidification layer that plastic material forms in die cavity etc., in order to make gas full and uniform, enter 14 inside, die cavity position, need test, adjust the size of material overflow cavity repeatedly, when material and technique change, the size of material overflow cavity also will be adjusted, and has brought great inconvenience to mould manufacturing and production.And the present invention has used this structure of controlled material overflow cavity, has just avoided this drawback.
Referring to Fig. 8,14 inside, mold cavity position have formed hollow
The 5th step, referring to Fig. 9, at this moment, injecting machine material tube can be in the 4th step process storing, after the product cooling, solidifying, control controlled gas-pressurized and discharge the mold cavity plastics inner from inlet duct 8, after this, injection moulding machine mould open, product ejects, take out plastic products, in next process before, controlled material overflow cavity piston moves to initial reset.
Referring to Figure 10, be shown as die cavity internal pressure time variation diagram
In Figure 10, laterally represent the product injection mo(u)lding time in the die cavity, vertically be the die cavity internal pressure.
Be zero when the mold cavity internal pressure is initial, when injection machine injects die cavity with molten plastic, the die cavity internal pressure begins to increase, as line 51, after plastics were full of in the die cavity, the molding machine screw rod molten plastic that promote to promote in the barrel that moves on entered mold cavity, as line 52, subsequently, material overflow cavity piston 11, a point begin to withdraw from.As line X1.At this moment, by screw in injection molding machine pressure, promote the interior product core melting charge of die cavity and discharge from discharge gate, the die cavity internal pressure begins to descend, as line 53.Fall back on certain position and stop, at the b point, controlled gas-pressurized begins to inject mold cavity product inside, controllable piston 11 retreats again simultaneously, controlled gas-pressurized promotes die cavity position 14 inner molten plastics and discharges from discharge gate 10, and gas pressure raises in the die cavity, as line 61.At the c point, controllable piston 11 is opened and is finished, controllable piston 11 continues to retreat again, controlled gas-pressurized promotes die cavity position 14 inner molten plastics and discharges from discharge gate 27, die cavity air pressure such as line 61,62, continue to replenish volume, die cavity internal pressure such as the line 63,64,65 that reduces because of the cooling contraction because of plastics in the die cavity.Product cools off, solidifies in the last die cavity, and controlled gas-pressurized is discharged die cavity from air inlet, and controlled gas-pressurized pressure is reduced to atmospheric pressure.Subsequently, product is taken out in the mould die sinking.
For this scheme of better implement, better controlled gas-pressurized of available heat absorption or fluid.For example: water, air, wet goods.
In Figure 10, laterally represent the product injection mo(u)lding time in the die cavity, vertically represent the die cavity internal pressure.
Be zero when the mold cavity internal pressure is initial, when injection machine injected die cavity with molten plastic, the die cavity internal pressure began to increase, as line 16, after plastics are full of in the die cavity, the molding machine screw rod moves on, as line 17, subsequently, piston in the controlled material overflow cavity slowly retreats at the a0 point under less than the control of injection pressure, to position a1, x1 represents as line, and the piston that the plastic core molten plastic enters because of controlled material overflow cavity in the mold cavity withdraws from the cavity of vacating.Promote the interior product core melting charge of die cavity and discharge from discharge gate, the die cavity internal pressure begins to descend, and as line 18, at the c point, controlled gas-pressurized begins to inject mold cavity product inside, continues to promote die cavity position 14 inner molten plastics and discharges from discharge gate.Piston in the controlled material overflow cavity continues slowly to retreat, and as line x2, gas pressure raises in the die cavity, as line 19.At the a2 point, controllable piston is opened and is finished.Die cavity air pressure such as line 20 continue to replenish volume, die cavity internal pressure such as the line 21,22,23 that reduces because of the cooling contraction because of plastics in the die cavity.Product cools off, solidifies in the last die cavity.Controlled gas-pressurized is discharged die cavity from air inlet, and controlled gas-pressurized pressure is reduced to atmospheric pressure.Subsequently, product is taken out in the mould die sinking.
Though below design and embodiment according to the object of the invention have been done to elaborate with reference to accompanying drawing; but those of ordinary skills can recognize; under the precondition that does not break away from the claim limited range; still can make various improvement and conversion to the present invention, and this improvement and conversion still should belong to protection scope of the present invention.
Claims (9)
1, a kind of forming method of hollow plastic product is characterized in that, may further comprise the steps at least:
A. by screw in injection molding machine (4) melted plastic material (5) is injected in the interior die cavity (6) of mould, makes to be full of or to be full of substantially melted plastic material in the die cavity;
B. immediately, screw in injection molding machine continues (6) pusher in mold cavity, makes 2.5～6 seconds of mold cavity pressurize;
C. during the pressurize of screw in injection molding machine pusher, the controllable piston (11) of control material overflow cavity withdraws from a section and moves, and makes screw in injection molding machine promote that molten plastic in the die cavity enters that control material overflow cavity controllable piston withdraws from and in the cavity vacated;
D. immediately, controlled gas-pressurized/liquid is imported in the melted plastic material in the above-mentioned die cavity by air inlet/hydraulic control system device, promote further that controllable piston that molten plastic in the inner plastics of above-mentioned die cavity enters control material overflow cavity (15) continues to withdraw from and in the cavity vacated;
E. control moving and the position of controlled pressurization gas/liquid body pressure and material overflow cavity controllable piston (11), make controlled gas-pressurized fully enter the plastics inner of thicker position section in the die cavity, and keep gas pressure, plastics are solidified in die cavity;
F. behind the interior plastics solidification of the interior die cavity of mould, the gas/liquid of will pressurizeing body is discharged die cavity (6), opens mould, takes out plastic products.
2, the forming method of hollow plastic product according to claim 1 is characterized in that, the step that melted plastic material is injected in the mold cavity is to carry out under the situation of no plastics in the die cavity in this mould.
3, the related device of the forming method of hollow plastic product according to claim 1, it is characterized in that, material overflow cavity (15) is a hydraulic cylinder or pneumatic or electronic or arbitrary traditional piston stroke controlled, make the volume size of material overflow cavity to control, and can controlled pressure and displacement when initial flash enters.
4, according to claim 1 or/and the forming method of 3 described hollow plastic products, it is characterized in that, the pressure and the action time of piston are complementary in the propelling pressure of screw in injection molding machine (4) and action time and the material overflow cavity (15), make that the molten plastic in the mold cavity (6) enters material overflow cavity (15) under certain pressure.
5, the related device of the forming method of hollow plastic product according to claim 3 is characterized in that, the end in the material overflow cavity is stepped.
According to the related device of forming method of claim 3 or 5 described hollow plastic products, it is characterized in that 6, material overflow cavity one end and mold cavity junction are that inner chamber is that sectional area is 1～20mm
2, length is the less strip cavity (9) of 1～5mm, in material overflow cavity and with strip die cavity joining place be that an inner chamber is that sectional area is 25～100mm
2, length is the strip cavity (10) of 3～10mm, this strip cavity (9) and material overflow cavity (15) and less strip cavity (10) form stepped.
7. the forming method of hollow plastic product according to claim 1, it is characterized in that, initial flash of discharging is by the pressure of piston (11) in the propelling pressure of screw in injection molding machine (4) and action time and the material overflow cavity (15) and is complementary action time and realizes, is discharged to plastics in the material overflow cavity afterwards and controls gas/liquid body pressure and realize action time.
8, the forming method of hollow plastic product according to claim 1 is characterized in that, the plastic products that described forming method is made form cavity in the centre (14) at the thicker position of one section.
9, the forming method of hollow plastic product according to claim 1, it is characterized in that, one or more material overflow cavity (15) can be set on mould, and the piston action of each material overflow cavity is to control by the oil pressure control system of injection machine or external oil pressure control system, external electronic control system etc.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100020951A CN100522553C (en) | 2005-01-17 | 2005-01-17 | Forming method of hollow plastic product and related apparatus |
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| CNB2005100020951A CN100522553C (en) | 2005-01-17 | 2005-01-17 | Forming method of hollow plastic product and related apparatus |
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| CN1807059A true CN1807059A (en) | 2006-07-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106346695A (en) * | 2016-08-31 | 2017-01-25 | 江苏新泉汽车饰件股份有限公司 | Technology for forming instrument board with hollow structure |
| CN108673844A (en) * | 2018-06-22 | 2018-10-19 | 北京化工大学 | It is a kind of passively to move back core formula layering injection molding |
| CN110142935A (en) * | 2019-06-05 | 2019-08-20 | 嘉兴瑛蔓贸易有限公司 | A kind of precision complicated plastic injection mold casting device |
| TWI769288B (en) * | 2018-08-08 | 2022-07-01 | 揚明光學股份有限公司 | Mold for injection molding and method of manufacturing polymer material component |
-
2005
- 2005-01-17 CN CNB2005100020951A patent/CN100522553C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106346695A (en) * | 2016-08-31 | 2017-01-25 | 江苏新泉汽车饰件股份有限公司 | Technology for forming instrument board with hollow structure |
| CN108673844A (en) * | 2018-06-22 | 2018-10-19 | 北京化工大学 | It is a kind of passively to move back core formula layering injection molding |
| TWI769288B (en) * | 2018-08-08 | 2022-07-01 | 揚明光學股份有限公司 | Mold for injection molding and method of manufacturing polymer material component |
| CN110142935A (en) * | 2019-06-05 | 2019-08-20 | 嘉兴瑛蔓贸易有限公司 | A kind of precision complicated plastic injection mold casting device |
| CN110142935B (en) * | 2019-06-05 | 2021-04-30 | 台州市永硕汽车部件有限公司 | Pouring device for precise complex injection mold |
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| Publication number | Publication date |
|---|---|
| CN100522553C (en) | 2009-08-05 |
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Address after: 102208 Beijing, Huilongguan, Beijing, China Billiton Machinery Co., Ltd. Patentee after: Co., Ltd of mechanical group is opened up in Beijing Address before: 102208 Beijing, Huilongguan, Beijing, China Billiton Machinery Co., Ltd. Patentee before: Beijing Chn-Top Machinery Co., Ltd. |