CN112549440A - Injection molding process of plastic product - Google Patents
Injection molding process of plastic product Download PDFInfo
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- CN112549440A CN112549440A CN201910913966.7A CN201910913966A CN112549440A CN 112549440 A CN112549440 A CN 112549440A CN 201910913966 A CN201910913966 A CN 201910913966A CN 112549440 A CN112549440 A CN 112549440A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1753—Cleaning or purging, e.g. of the injection unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
- B29C33/722—Compositions for cleaning moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76595—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76662—Injection unit hopper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
- B29C2945/76735—Mould cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
- B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding process of a plastic product, relates to a material molding technology, and is used for solving the problem of poor molding quality of a common injection molding process, and comprises the following steps: pretreating raw materials, and drying the raw materials; the method comprises the following steps of (1) preprocessing a mould, namely cleaning the surface of a mould cavity of the mould and then preheating the mould; melting the raw materials, putting the cleaned raw materials into a hopper of an injection molding machine, and injecting the melted raw materials into a mold by a screw extruder; maintaining the pressure, and continuously injecting the raw materials into the mold to ensure the internal pressure of the cavity; cooling and forming, namely cooling the die to cool, solidify and form the raw materials in the cavity; demolding, namely separating the mold, and pulling the molded plastic product out of the cavity; the invention has the following advantages and effects: the treatment to the die cavity can reduce the rheological creep of the raw materials in the solidification process, so that the twisted grains are not easy to appear after the product is formed, and the purpose of improving the product forming quality is achieved.
Description
Technical Field
The invention relates to a material molding technology, in particular to a modified injection molding process of a plastic product.
Background
With the deep development of petroleum products, many materials with excellent performance, such as plastics like PC and ABS, have been produced, and these materials have advantages of good toughness, high strength, easy molding, and so on, and thus have been widely used in industry.
At present, the Chinese patent with application publication number CN109262946A discloses an energy-saving and emission-reducing high-gloss injection molding process, which comprises the following steps: (1) setting injection molding parameters, adding a plastic material into a hopper, heating and melting by a first heating mechanism, and feeding the molten material into a screw; (2) the second heating mechanism heats, the motor is moved to drive the base to translate, the injection molding machine is moved to the position of the injection molding opening, and the screw starts to inject; (3) after the injection is finished, the position sensor rechecks that the position parameters of the screw are correct, the cooling is started, the servo driver controls the servo pump, the oil is injected and cooled, and the circulated hot oil enters the oil storage tank for standby; (4) demolding by the demolding mechanism and finishing injection molding; (5) when the next injection molding is carried out, hot oil in the oil storage tank is led out through the second oil inlet pipe, the servo driver controls the second servo pump, and the oil injection preheating hopper is arranged.
For plastic products, the plastic products are usually formed by injection molding, and as mentioned above, the plastic products are usually produced by an injection molding machine, but after the plastic products are produced by the above process, the surface of the formed products can generate a distortion-like texture similar to that formed by the solidification of lava in the flowing process, thereby leading to poor forming quality of the products.
Disclosure of Invention
The invention aims to provide a modified injection molding process of a plastic product, which can reduce the occurrence frequency of twisted grains on the surface of the plastic product, thereby achieving the purpose of improving the molding quality of the product.
The technical purpose of the invention is realized by the following technical scheme: an injection molding process of a plastic product comprises the following steps:
s1, pretreating the raw material, and drying the raw material;
s2, preprocessing the die, namely firstly cleaning the surface of a die cavity of the die, and then preheating the die to enable the temperature of the die cavity to reach 170-230 ℃;
s3, melting the raw material, putting the cleaned raw material into a hopper of an injection molding machine, and injecting the molten raw material into a mold by a screw extruder;
s4, maintaining the pressure, and continuously injecting the raw materials into the die to ensure the internal pressure of the die cavity;
s5, cooling and forming, namely cooling the die to enable the raw material in the cavity to be cooled, solidified and formed;
s6, demoulding, separating the mould, and pulling the formed plastic product from the cavity.
The twisted grains on the surface of the injection molding product are usually formed by that a small part of raw materials is firstly solidified in the injection molding process, and then the part of the raw materials which are firstly solidified generate creeping in the process of continuously injecting the raw materials into the injection molding machine, so that twisted irregular grains are generated on the surface of a finished product; preheat the temperature that can make the mould die cavity more be close to the temperature after the raw materials melts, the raw materials is at the in-process of pouring into the die cavity like this, be difficult to because of the temperature difference between die cavity surface and self great temperature variation appears, the condition that the surface solidifies earlier just is difficult to appear in the raw materials of molten state like this, can make the mould die cavity fill with by the raw materials earlier like this, later cool off solidification gradually again, can make the raw materials do not produce flow at the in-process that solidifies as far as possible like this, the raw materials after solidifying just is difficult to produce the wriggling under pushing of follow-up raw materials like this, the surface of product just is difficult to produce the line of twist form like this, thereby reach the purpose that improves.
The invention is further provided with: the cleaning method of the die cavity comprises the following steps: firstly, high-pressure air is used for blowing the surface of the mold cavity, then cleaning agents are sprayed to the surface of the mold cavity for showering, then the mold is heated, and after the cleaning agents on the surface of the mold cavity are completely evaporated, high-pressure air is used for blowing the surface of the mold cavity again.
By adopting the above scheme, the blowing removes the bigger impurity of granule such as the attached dust on mould surface earlier, and the shower then can detach the grease on mould cavity surface, and the cleaner is detached to the mode of rethread heating evaporation, can reduce the impurity of sneaking into in the raw materials like this for the raw materials is difficult to receive the influence of impurity and produces defects such as hole and air gap at the in-process of moulding plastics, thereby reaches the purpose that further improves product shaping quality.
The invention is further provided with: the cleaning agent can be one or more of tetrahydrofuran, trifluoroacetic acid, ethanol and isopropanol.
By adopting the scheme, the cleaning agent belongs to a slightly toxic or nontoxic solvent, can better ensure the production safety when being applied to a production link, simultaneously has the boiling point of being lower than 100 ℃, and can ensure the sufficient volatilization of the solvent only by heating a mould after being used, thereby reducing the influence of the cleaning agent on the product forming.
The invention is further provided with: the cleaning agent is ethanol.
By adopting the scheme, the ethanol is a common additive in food, the property is safe and non-toxic, the boiling point is only 78.3 ℃, the temperature of the mold can reach more than 170 ℃ after preheating, and the ethanol basically and completely volatilizes at the temperature, so that the residue of the cleaning agent can be eliminated as far as possible, and the influence of the cleaning agent on the product molding quality is further reduced.
The invention is further provided with: the raw material comprises 30% of PC and 70% of ABS.
By adopting the scheme, the PC material has the advantages of creep resistance, good dimensional stability and heat resistance, the ABS has the advantages of good impact resistance, scratch resistance, corrosion resistance and the like, and the overall performance of the material can be improved after the two phases are combined, so that the product can obtain better service performance.
The invention is further provided with: the raw material melting method comprises the following specific steps: the raw materials are heated and melted in a segmented mode, the raw materials are melted at the temperature of 190-200 ℃ at the front section, the temperature is kept for 5-10 min and then switched to the temperature of the middle section, the raw materials are melted at the temperature of 240-250 ℃ at the middle section, the raw materials are heated and stirred for 5-10 min and then switched to the temperature of the rear section, and the raw materials are heated and melted at the temperature of 220-230 ℃ at the rear section.
By adopting the scheme, the melting temperatures of the PC and the ABS are different, the material table is inquired, the melting temperature of the PC is 220-240 ℃, the melting temperature of the ABS is 190-200 ℃, the ABS is fully melted by firstly heating to 190-200 ℃, then the temperature is increased to 240-250 ℃ to ensure that the two materials are fully melted, then the two materials can be uniformly mixed by stirring, the performance uniformity of the mixed material is ensured, the buffer time of the mixed material can be given by the back-stage heat preservation, the improvement of the mutual melting degree between the two materials is promoted, and therefore the formed product has better mechanical property.
The invention is further provided with: in the step S4, the specific method for maintaining the pressure of the raw material is as follows: and continuously injecting the raw materials into the cavity of the mold to ensure that the internal pressure of the cavity reaches 70-100 MPa, maintaining the pressure for 15-30 s, then reducing the temperature of the mold to 140-160 ℃, preserving the temperature for 10-15 s, then reducing the internal pressure of the cavity to 40-60 MPa, and maintaining the pressure for 10-15 s.
Through adopting above-mentioned scheme, the mode of pressurizeing to the mould inner chamber with the form of annotating the material can reduce the gas quantity of sneaking into in the raw materials, and the cooling is less than the melting temperature of any one of two kinds of materials to 140~160 ℃, the miscanthus floridulus maedi of certain degree also can be produced to the miscanthus floridulus majus like this, the mode of this kind of gradient decompression simultaneously can be given the raw materials in the mould die cavity and solidify with abundant time, in order to reduce the production of defects such as cavity, shrinkage porosity after the product shaping, thereby reach the purpose that further improves product shaping quality.
The invention is further provided with: the cooling forming method in step S5 includes: and injecting cooling liquid into a cooling runner in the mold, reducing the temperature of a mold cavity to 120-130 ℃ at a cooling speed of 3-5 ℃/min, demolding the product, taking out, and cooling to room temperature in air.
By adopting the scheme, the product can be shaped by cooling the product in the mold cavity, so that the product is prevented from deforming in the solidification process; and the product is cooled to 120-130 ℃ at a higher speed and then is air-cooled to room temperature, so that on one hand, unnecessary waiting time in the solidification process of the mold can be reduced, and meanwhile, the air cooling speed of the rear section is lower, so that the internal stress generated in the product due to temperature change can be reduced, the product is not easy to crack, and the product has good service performance.
In conclusion, the invention has the following beneficial effects:
1. the treatment of the die cavity can reduce the rheological creep of the raw materials in the solidification process, so that the twisted grains are not easy to appear after the product is formed, thereby achieving the purpose of improving the forming quality of the product;
2. the ethanol used as the cleaning agent can ensure the cleaning effect of the mold cavity and the cleaning rate of the cleaning agent, so that the cleaning agent can not influence the molding quality of the product;
3. the gradient heating and cooling modes can ensure the balance of the performances of the two materials and reduce the generation of internal stress of the materials, thereby ensuring that the molded product has better mechanical properties.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
an injection molding process of a plastic product comprises the following steps:
s1 pretreatment of raw materials, selecting PC and ABS as raw materials, and drying the raw materials for later use.
S2, preprocessing the die, firstly cleaning the surface of the die cavity, wherein the cleaning method comprises the following steps: firstly, high-pressure air is used for blowing the surface of the die cavity, then a cleaning agent is sprayed on the surface of the die cavity for flushing, the cleaning agent can be one or more of tetrahydrofuran, trifluoroacetic acid, ethanol and isopropanol, and the ethanol is selected as the cleaning agent because the ethanol is safe and nontoxic and has low boiling point so as to volatilize in consideration of the safety of the cleaning agent in the using process and the influence on the environment. And heating the die after showering, and blowing the surface of the die cavity by high-pressure air again after the cleaning agent on the surface of the die cavity is completely evaporated so as to ensure that the die cavity is clean and free of stains.
And then closing the two parts of moulds, and preheating the moulds to enable the temperature of the mould cavity to reach 170-230 ℃.
S3 melting raw material, putting 30% PC and 70% ABS into hopper of injection machine to melt, heating mode in melting process: melting is carried out in sections, the raw materials are melted at the temperature of 190-200 ℃ in the front section, the temperature is kept for 5-10 min and then switched to the temperature of the middle section, the raw materials are melted at the temperature of 240-250 ℃ in the middle section, the temperature is kept for 5-10 min and then switched to the temperature of the rear section, the raw materials are kept at the temperature of 220-230 ℃ in the rear section, and then the raw materials in the molten state are injected into a mold through a screw extruder.
S4, pressure maintaining, namely, maintaining the pressure of the raw material in the mold cavity, wherein the pressure maintaining method specifically comprises the following steps: and continuously injecting the raw materials into the cavity of the mold to ensure that the internal pressure of the cavity reaches 70-100 MPa, maintaining the pressure for 15-30 s, then reducing the temperature of the mold to 140-160 ℃, preserving the temperature for 10-15 s, then reducing the internal pressure of the cavity to 40-60 MPa, and maintaining the pressure for 10-15 s.
S5, cooling and forming, namely cooling the die to cool, solidify and form the raw material in the cavity, wherein the specific cooling and forming method comprises the following steps: and injecting cooling liquid into a cooling runner in the mold, so that the temperature of the mold cavity is reduced to 120-130 ℃ at a cooling speed of 3-5 ℃/min.
S6, demoulding, separating the mould, and pulling the formed plastic product out of the mould cavity to cool the product to room temperature.
Comparative example 1:
the raw materials are melted in a single step, the raw materials are directly heated to 190-200 ℃ for melting and heat preservation, and the rest steps are completely the same as those in the embodiment 1.
Comparative example 2:
the melting of the raw materials is carried out in two sections, the raw materials are heated to 190-200 ℃ in the front section, the temperature is kept for 5-10 min and then switched to the temperature of the rear section, the raw materials are melted and kept at the temperature of 240-250 ℃ in the rear section, and then the rest steps are completely the same as those in the embodiment 1.
Comparative example 3:
the raw materials are melted once, the raw materials are heated to 190-200 ℃ at the front section, the temperature is kept for 5-10 min and then switched to the middle section temperature, the raw materials are melted at the middle section temperature of 240-250 ℃, the temperature is kept for 5-10 min and then switched to the rear section temperature, the raw materials are kept at the rear section temperature of 190-200 ℃, and other steps are completely the same as those in the embodiment 1.
Experimental analysis:
the melting of the raw materials mainly affects the mutual melting degree between the two materials, and the mutual melting degree mainly affects the mechanical properties of the materials, so that the experimental process respectively takes the finished products formed by condensing the raw materials after the melting and mixing of the control group, 10 small blocks with the length, width and thickness of 50mmX20mmX1mm are cut for each group to serve as samples, and then the tensile strength and the impact strength are respectively measured, and in the impact strength test process, the notched strength test and the unnotched strength test are carried out (note: notched means that a V-shaped notch is formed in the side edge of the sample), and the specific property characterization is shown in data table 1.
TABLE 1 sample tensile strength, impact strength recording sheet
Looking up a common plastic mechanical property comparison table, the tensile strength of the single PC is 52.4MPa, the notched impact strength is 10KJ/m2, and the unnotched impact strength is 70KJ/m 2; the tensile strength of ABS alone is 79MPa, the notched impact strength is 23KJ/m2, and the unnotched impact strength is 98KJ/m2, and the data in Table 1 show that the performance of the two materials after being mixed is superior to that of the single material.
Comparing the data of example 1, comparative example 1 and comparative example 2 in table 1, it can be seen that as the melting step is refined, the mechanical properties of the materials are gradually improved, because the fractional melting can promote the degree of mutual melting between the two materials; continuing to compare example 1 and comparative example 3 in table 1, it can be seen that the degree of mutual melting between the two also receives the influence of temperature, and the temperature between the two is more favorable for promoting mutual melting between the two, so that the mixed material has better mechanical properties, and as mentioned above, the melting step of refining the material is favorable for improving the mechanical properties of the composite material.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. An injection molding process of a plastic product is characterized in that: the method comprises the following steps:
s1, pretreating the raw material, and drying the raw material;
s2, preprocessing the die, namely firstly cleaning the surface of a die cavity of the die, and then preheating the die to enable the temperature of the die cavity to reach 170-230 ℃;
s3, melting the raw material, putting the cleaned raw material into a hopper of an injection molding machine, and injecting the molten raw material into a mold by a screw extruder;
s4, maintaining the pressure, and continuously injecting the raw materials into the die to ensure the internal pressure of the die cavity;
s5, cooling and forming, namely cooling the die to enable the raw material in the cavity to be cooled, solidified and formed;
s6, demoulding, separating the mould, and pulling the formed plastic product from the cavity.
2. The injection molding process of a plastic product according to claim 1, wherein: the cleaning method of the die cavity comprises the following steps: firstly, high-pressure air is used for blowing the surface of the mold cavity, then cleaning agents are sprayed to the surface of the mold cavity for showering, then the mold is heated, and after the cleaning agents on the surface of the mold cavity are completely evaporated, high-pressure air is used for blowing the surface of the mold cavity again.
3. The injection molding process of a plastic product according to claim 2, wherein: the cleaning agent can be one or more of tetrahydrofuran, trifluoroacetic acid, ethanol and isopropanol.
4. The injection molding process of a plastic product according to claim 3, wherein: the cleaning agent is ethanol.
5. The injection molding process of a plastic product according to claim 1, wherein: the raw material comprises 30% of PC and 70% of ABS.
6. The injection molding process of claim 5, wherein: the raw material melting method comprises the following specific steps: the raw materials are heated and melted in a segmented mode, the raw materials are melted at the temperature of 190-200 ℃ at the front section, the temperature is kept for 5-10 min and then switched to the temperature of the middle section, the raw materials are melted at the temperature of 240-250 ℃ at the middle section, the raw materials are heated and stirred for 5-10 min and then switched to the temperature of the rear section, and the raw materials are heated and melted at the temperature of 220-230 ℃ at the rear section.
7. The injection molding process of a plastic product according to claim 1, wherein: in the step S4, the specific method for maintaining the pressure of the raw material is as follows: and continuously injecting the raw materials into the cavity of the mold to ensure that the internal pressure of the cavity reaches 70-100 MPa, maintaining the pressure for 15-30 s, then reducing the temperature of the mold to 140-160 ℃, preserving the temperature for 10-15 s, then reducing the internal pressure of the cavity to 40-60 MPa, and maintaining the pressure for 10-15 s.
8. The injection molding process of a plastic product according to claim 1, wherein: the cooling forming method in step S5 includes: and injecting cooling liquid into a cooling runner in the mold, reducing the temperature of a mold cavity to 120-130 ℃ at a cooling speed of 3-5 ℃/min, demolding the product, taking out, and cooling to room temperature in air.
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| CN201910913966.7A CN112549440A (en) | 2019-09-25 | 2019-09-25 | Injection molding process of plastic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114248412A (en) * | 2021-11-19 | 2022-03-29 | 张家港市欧凯医疗器械有限公司 | Production process of medical catheter |
Citations (6)
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