CN104669573A - Injection molding method of plastic food steamer - Google Patents
Injection molding method of plastic food steamer Download PDFInfo
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- CN104669573A CN104669573A CN201310625092.8A CN201310625092A CN104669573A CN 104669573 A CN104669573 A CN 104669573A CN 201310625092 A CN201310625092 A CN 201310625092A CN 104669573 A CN104669573 A CN 104669573A
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Abstract
The invention discloses an injection molding method of a plastic food steamer. The injection molding method comprises the following steps: firstly, pre-treating raw materials, an injection molding system and a food steamer mould; then, performing plasticizing, injection molding, pressure maintaining, cooling shaping and demoulding to obtain a plastic food steamer. Compared with traditional manual manufacturing of food steamers, the injection molding method of the plastic food steamer of the invention is characterized by simple steps, short product molding cycle and great improvement on food steamer production efficiency. According to the injection molding method of the plastic food steamer, a hot-runner molding technology is utilized, so that granules are kept in a molten state during the whole injection molding cycle, granules are saved, and the cost of a plastic food steamer is reduced. According to the injection molding method, the mould is heated to a certain temperature, the product molding efficiency and the product appearance are improved as well as the product defects are inhibited.
Description
Technical field
The present invention relates to injection molding technology field, spy particularly relates to a kind of injection moulding process of plastics food steamer.
Background technology
Injection moulding is a kind of method of industrial products production moulding, and injection moulding can be divided into injection mo(u)lding die pressing and casting die.Injection moulding machine is the main former of plastic products thermoplastic or thermosetting plastics being made various shape by mould, and injection moulding is realized by injection machine and mould.
Food steamer has a wide range of applications in China's Food service, the huge market demand.Mostly traditional bamboo food steamer is artificial manufacture, and productivity ratio is low, and product is uneven, and the supply of material is unstable.For the problems referred to above, food-grade macromolecular material can be adopted, prepare plastics food steamer by Shooting Technique, ensure the batch production of food steamer, avoid the uneven problem of traditional food steamer quality simultaneously.
The production and processing of Shooting Technique to food steamer has great importance, and determines the production cycle of food steamer product to a certain extent, gloss appearance, product cost etc., and therefore how adjusting corresponding Shooting Technique becomes one of key factor of plastics food steamer product.
Summary of the invention
For the defect of prior art, the object of this invention is to provide a kind of injection moulding process of plastics food steamer, the method implementation step is simple, effectively reduces the formed product cycle, simultaneously by corresponding process conditions, improves the quality of products.
For achieving the above object, the technical solution used in the present invention is as follows:
The invention provides a kind of injection moulding process of plastics food steamer, comprise the following steps: first, raw material through pretreatment, adapted to injection system and food steamer mould through pretreatment, then carry out plastifying, inject, pressurize, cooling forming, the demoulding, obtain plastics food steamer.
Described raw material is plastic pellet.
Described plastic pellet is made up of the component of following weight portion:
Food-grade macromolecular material 100 parts;
Food grade filler 5 ~ 30 parts.
Described food-grade macromolecular material be selected from food-grade polyolefin plastics, food grade polycarbonate, food-grade polyamide, food-grade PET, food-grade acrylonitrile-butadiene-styrene (ABS) plastics one or more.
Described food-grade polyolefin plastics is selected from food-grade polypropylene or food-grade refractory polyethylene, is preferably food-grade polypropylene.
Described food grade filler be selected from food-grade calcium carbonate, calcium sulfate crystal whiskers, medical grade talcum powder or medical grade barium sulfate one or more, be preferably calcium sulfate crystal whiskers.
Described raw material is as follows through pretreated step: raw material is put into baking oven dry 2 ~ 4 hours.
Described adapted to injection system and food steamer mould as follows through pretreated step: in described adapted to injection system barrel heat, be heated to 170 ~ 290 DEG C, by the hot flow path heating temperatures in described adapted to injection system to 200 ~ 300 DEG C, by described food steamer mold heated to 45 ~ 90 DEG C.
Described food steamer mould comprises cover half, running gate system, liftout attachment, dynamic model and guide pillar; Described running gate system is fixed on described cover half, and described liftout attachment is positioned at the side of described cover half inside, and one end of described guide pillar is fixed on described dynamic model, and described running gate system and described liftout attachment are positioned at the same side of finished product.
Described cover half comprises fixed clamping plate, gripper shoe and solid plate; Described gripper shoe is between described fixed clamping plate and described solid plate, and described fixed clamping plate and described solid plate are screwed and are positioned in described gripper shoe.
Described running gate system comprises runner, cast gate and slag well; Described cast gate is positioned at center, the product back side, is connected with flow field end, and described slag well is positioned at described cast gate upper end; Described running gate system is fixed on fixed clamping plate by centring ring and sprue bush.
Described runner is at least provided with a sprue.
Described liftout attachment comprises push rod backing plate, push rod fixed head, support column and push rod; Together with push rod backing plate is screwed in push rod fixed head, one end of described support column is positioned on fixed clamping plate through push rod backing plate and push rod fixed head, and described liftout attachment ejects from the product back side between solid plate and fixed clamping plate; Described push rod is screwed on push rod fixed head through push rod backing plate.
Described dynamic model comprises moving clamping plate and moving platen, together with described moving clamping plate is screwed in described moving platen.
Described guide pillar, through moving platen and solid plate, is screwed and is positioned on moving clamping plate.
Described hot flow path belongs to a part for food steamer die casting system, mainly the plastic pellet being sent to food steamer mould gate from injection molding machine nozzle is remained molten condition.
Described plasticizing to add to through pretreated raw material in the barrel of pretreated adapted to injection system and food steamer mould, to be heated to molten condition.
Described injection is that be expelled in the adapted to injection system after heating and food steamer mould, wherein injection pressure is 65 ~ 120MPa, and inject time is 5 ~ 8S by the raw material of molten condition by the nozzle through pretreated adapted to injection system and food steamer mould.
Described injection process is divided into 3 stages, and there is corresponding injection pressure in each stage.
Described pressurize carries out pressurize by evenly injecting, and wherein dwell pressure is 50 ~ 80MPa, and the dwell time is 3 ~ 5S.
The time of described cooling forming is 40 ~ 53S.
The present invention compared with prior art, has the following advantages and beneficial effect:
1, compared with manufacturing by hand with traditional food steamer, plastics food steamer injection moulding process step of the present invention is simple, and the formed product cycle is short, drastically increases the production efficiency of food steamer.
2, the present invention adopts hot flow path Shooting Technique, makes pellet in molten condition in whole injection cycle, and saving pellet, reduces the cost of plastics food steamer.
3, the present invention is to mold heated uniform temperature, can improve shaping efficiency and the outward appearance of product, suppresses the defect of product.
Accompanying drawing explanation
Fig. 1 is the flow chart of the injection moulding process of plastics food steamer of the present invention.
Fig. 2 is the side view of food steamer mould used in the present invention.
Fig. 3 is the top view of the food steamer mould shown in Fig. 2.
Wherein, 1 is fixed clamping plate, and 2 is solid plate, and 3 is centring ring, and 4 is sprue bush, and 5 is runner, 6 is cast gate, and 7 is slag well, and 8 is push rod backing plate, and 9 is push rod fixed head, and 10 is support column, 11 is push rod, and 12 is moving platen, and 13 is moving clamping plate, and 14 is guide pillar, and 15 is gripper shoe.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Injection molding process in the present invention can be used for the injection mo(u)lding of plastics food steamer, and it is implemented based on corresponding adapted to injection system and injection mold.
Adapted to injection system in the present invention utilizes TOP-TIP to carry out injection moulding.
Embodiment 1
As shown in Figure 1, Fig. 1 is the flow chart of the injection moulding process of plastics food steamer of the present invention.
Get 100 parts of food-grade polypropylenes, 30 parts of calcium sulfate crystal whiskers, mix, and add twin-screw granulation, obtain modified food-grade polypropylene pellet;
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the food-grade polypropylene pellet of modification is dried 2 ~ 3 hours under the condition of 80 ~ 90 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Be heated to 170 ~ 225 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 200 ~ 235 degree, mold heated is to 45 ~ 50 degree;
(3) plastify: modified food-grade polypropylene particle good for step (1) pretreatment is added in the barrel processed through step (2), is heated to and melts molten condition;
(4) inject: in the nozzle injection of the hot flow path that the modified food grade polypropylene of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 110MPa, and second stage injection pressure is 100MPa, and phase III injection pressure is 80MPa; Inject time is 8S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 55MPa, and the dwell time is 3S;
(6) cooling forming: the cooling forming time is 40S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 2
Get 100 parts of food grade polycarbonate, 5 parts of food-grade calcium carbonate, mix, and add twin-screw granulation, obtain modified food grade polycarbonate;
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the food grade polycarbonate pellet of modification is dried 2 ~ 4 hours under the condition of 120 ~ 130 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Be heated to 260 ~ 290 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 285 ~ 300 degree, mold heated is to 80 ~ 90 degree;
(3) plastify: modified food grade polycarbonate good for step (1) pretreatment is added in the barrel processed through step (2), is heated to molten condition;
(4) inject: in the nozzle injection of the hot flow path that the modified food grade polycarbonate of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 115MPa second stage injection pressure is 100MPa, and phase III injection pressure is 90MPa; Inject time is 7S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 80MPa, and the dwell time is 5S;
(6) cooling forming: the cooling forming time is 51S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 3
Get 100 parts of food-grade PETs, 20 parts of medical grade talcum powder, mix, and add twin-screw granulation, obtain modified food-grade PET;
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the food-grade PET pellet of modification is dried 2 ~ 4 hours under the condition of 110 ~ 120 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Be heated to 265 ~ 280 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 275 ~ 290 degree, mold heated is to 85 ~ 90 degree;
(3) plastify: modified food-grade PET good for step (1) pretreatment is added in the barrel processed through step (2), is heated to molten condition;
(4) inject: in the nozzle injection of the hot flow path that the modified food level PET of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 120MPa, and second stage injection pressure is 110MPa, and phase III injection pressure is 100MPa; Inject time is 5S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 80MPa, and the dwell time is 4S;
(6) cooling forming: the cooling forming time is 53S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 4
Get 100 parts of food-grade acrylonitrile-butadiene-styrene (ABS)s, 15 parts of medical grade barium sulfate, mix, and add twin-screw granulation, obtain modified food-grade acrylonitrile-butadiene-styrene (ABS);
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the food-grade acrylonitrile-butadiene-styrene (ABS) pellet of modification is dried 2 ~ 4 hours under the condition of 80 ~ 85 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Be heated to 180 ~ 210 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 200 ~ 220 degree, mold heated is to 50 ~ 65 degree;
(3) plastify: modified food-grade acrylonitrile-butadiene-styrene (ABS) particle good for step (1) pretreatment is added in the barrel processed through step (2), is heated to molten condition;
(4) inject: in the nozzle injection of the hot flow path that the modified food level acrylonitrile-butadiene-styrene of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 90MPa, and second stage injection pressure is 85MPa, and phase III injection pressure is 75MPa; Inject time is 6S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 70MPa, and the dwell time is 4S;
(6) cooling forming: the cooling forming time is 43S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 5
Get the refractory polyethylene of 100 parts of food-grade, 10 parts of calcium sulfate crystal whiskers, mix, and add twin-screw granulation, obtain the refractory polyethylene of modified food-grade;
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the refractory polyethylene of the food-grade of modification is dried 2 ~ 3 hours under the condition of 70 ~ 80 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Be heated to 190 ~ 220 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 210 ~ 235 degree, mold heated is to 50 ~ 60 degree;
(3) plastify: the refractory polyethylene particle of modified food-grade good for step (1) pretreatment is added in the barrel processed through step (2), is heated to molten condition;
(4) inject: in the nozzle injection of the hot flow path that the refractory polyethylene of the modified food level of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 93MPa, and second stage injection pressure is 80MPa, and phase III injection pressure is 65MPa; Inject time is 6S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 50MPa, and the dwell time is 5S;
(6) cooling forming: the cooling forming time is 46S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 6
Get 100 parts of food-grade polyamide, 25 parts of food-grade calcium carbonate, mix, and add twin-screw granulation, obtain the polyamide of modified food-grade;
Concrete Shooting Technique is as follows:
(1) pretreatment of raw material: the polyamide of the food-grade of modification is dried 3 ~ 4 hours under the condition of 95 ~ 100 degree, for subsequent use;
(2) adapted to injection system and injection mold pretreatment:
Carry out heating 250 ~ 290 degree to the barrel in adapted to injection system, and the hot flow path in adapted to injection system is heated to 280 ~ 300 degree, mold heated is to 70 ~ 80 degree;
(3) plastify: modified food-grade polyamide particles good for step (1) pretreatment is added in the barrel processed through step (2), is heated to molten condition;
(4) inject: in the nozzle injection of the hot flow path that the modified food level polyamide of molten condition is processed through step (2) mould after heating; Injection process is divided into three phases: first stage injection pressure is 90MPa, and second stage injection pressure is 83MPa, and phase III injection pressure is 70MPa; Inject time is 6S;
(5) pressurize carries out pressurize by evenly injecting: dwell pressure is 60MPa, and the dwell time is 4S;
(6) cooling forming: the cooling forming time is 47S;
(7) demoulding: the demoulding while hot, takes out food steamer product.
Embodiment 7
As shown in Figures 2 and 3, Fig. 2 is the side view of food steamer mould used in the present invention; Fig. 3 is the top view of the food steamer mould shown in Fig. 2.
Food steamer mould comprises cover half, running gate system, liftout attachment, dynamic model and guide pillar 14; Described running gate system is fixed on described cover half, and described liftout attachment is positioned at the side of described cover half inside, and one end of described guide pillar 14 is fixed on described dynamic model, and described running gate system and described liftout attachment are positioned at the same side of finished product.
Described cover half comprises fixed clamping plate 1, gripper shoe 15 and solid plate 2; Described gripper shoe 15 is between described fixed clamping plate 1 and described solid plate 2, and described fixed clamping plate 1 and described solid plate 2 are screwed and are positioned in described gripper shoe 15.
Described running gate system comprises runner 5, cast gate 6 and slag well 7; Described cast gate 6 is positioned at center, the product back side, is connected with runner 5 end, and described slag well 7 is positioned at described cast gate 6 upper end; Described running gate system is fixed on fixed clamping plate 1 by centring ring 3 and sprue bush 4.
Described runner 5 is at least provided with a sprue.
Described liftout attachment comprises push rod backing plate 8, push rod fixed head 9, support column 10 and push rod 11; Together with push rod backing plate 8 is screwed in push rod fixed head 9, one end of described support column 10 is positioned on fixed clamping plate 1 through push rod backing plate 8 and push rod fixed head 9, and described liftout attachment ejects from the product back side between solid plate 2 and fixed clamping plate 1; Described push rod 11 is screwed on push rod fixed head 9 through push rod backing plate 8.Described support column 10 pairs of liftout attachments play a supportive role.
Described dynamic model comprises moving clamping plate 13 and moving platen 12, together with described moving clamping plate 13 is screwed in described moving platen 12.
Described guide pillar 14, through moving platen 12 and solid plate 2, is screwed and is positioned on moving clamping plate 13.Described guide pillar 14 pairs of fixed half and moving halfs play fixation.
Injection moulding process:
After fixed half and moving half matched moulds, the material melted enters runner 5, injects die cavity by cast gate 6, and after cooling curing, die sinking, shaping plastics food steamer ejects by push rod 11, can obtain finished product.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (12)
1. an injection moulding process for plastics food steamer, is characterized in that: comprise the following steps: first, raw material through pretreatment, adapted to injection system and food steamer mould through pretreatment, then carry out plastifying, inject, pressurize, cooling forming, the demoulding, obtain plastics food steamer.
2. the injection moulding process of plastics food steamer according to claim 1, is characterized in that: described raw material is plastic pellet.
3. the injection moulding process of plastics food steamer according to claim 2, is characterized in that: described plastic pellet is made up of the component of following weight portion:
Food-grade macromolecular material 100 parts;
Food grade filler 5 ~ 30 parts.
4. the injection moulding process of plastics food steamer according to claim 3, is characterized in that: described food-grade macromolecular material be selected from food-grade polyolefin plastics, food grade polycarbonate, food-grade polyamide, food-grade PET, food-grade acrylonitrile-butadiene-styrene (ABS) plastics one or more.
5. the injection moulding process of plastics food steamer according to claim 4, is characterized in that: described food-grade polyolefin plastics is selected from food-grade polypropylene or food-grade refractory polyethylene, is preferably food-grade polypropylene.
6. the injection moulding process of plastics food steamer according to claim 3, is characterized in that: described food grade filler be selected from food-grade calcium carbonate, calcium sulfate crystal whiskers, medical grade talcum powder or medical grade barium sulfate one or more, be preferably calcium sulfate crystal whiskers.
7. the injection moulding process of plastics food steamer according to claim 1, is characterized in that: described raw material is as follows through pretreated step: raw material is put into baking oven dry 2 ~ 4 hours.
8. the injection moulding process of plastics food steamer according to claim 1, it is characterized in that: described adapted to injection system and food steamer mould as follows through pretreated step: in described adapted to injection system barrel heat, be heated to 170 ~ 290 DEG C, by the hot flow path heating temperatures in described adapted to injection system to 200 ~ 300 DEG C, by described food steamer mold heated to 45 ~ 90 DEG C.
9. the injection moulding process of plastics food steamer according to claim 1, is characterized in that: described plasticizing to add to through pretreated raw material in the barrel of pretreated adapted to injection system and food steamer mould, to be heated to molten condition.
10. the injection moulding process of plastics food steamer according to claim 1, it is characterized in that: described injection is by the nozzle through pretreated adapted to injection system and food steamer mould by the raw material of molten condition, be expelled in the adapted to injection system after heating and food steamer mould, wherein injection pressure is 65 ~ 120MPa, and inject time is 5 ~ 8S.
The injection moulding process of 11. plastics food steamers according to claim 1, is characterized in that: described pressurize carries out pressurize by evenly injecting, and wherein dwell pressure is 50 ~ 80MPa, and the dwell time is 3 ~ 5S.
The injection moulding process of 12. plastics food steamers according to claim 1, is characterized in that: the time of described cooling forming is 40 ~ 53S.
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| CN201310625092.8A CN104669573A (en) | 2013-11-28 | 2013-11-28 | Injection molding method of plastic food steamer |
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| CN109114275A (en) * | 2018-07-24 | 2019-01-01 | 中氢新能技术有限公司 | A kind of fuel cell check valve, fuel cell and the method for manufacturing check valve |
| CN109676886A (en) * | 2018-12-19 | 2019-04-26 | 天津市津卫药品包装有限公司 | A kind of Shooting Technique of dialysis dry powder bucket |
| CN113059774A (en) * | 2021-03-15 | 2021-07-02 | 伯乐智能装备有限公司 | Method for controlling injection molding pressure maintaining process |
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