CN111168961A - Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting - Google Patents

Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting Download PDF

Info

Publication number
CN111168961A
CN111168961A CN202010053025.3A CN202010053025A CN111168961A CN 111168961 A CN111168961 A CN 111168961A CN 202010053025 A CN202010053025 A CN 202010053025A CN 111168961 A CN111168961 A CN 111168961A
Authority
CN
China
Prior art keywords
pressure maintaining
die
finished
forming
pipe fitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010053025.3A
Other languages
Chinese (zh)
Inventor
陈厚忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Kingbull Economic Development Co Ltd
Original Assignee
Wuhan Kingbull Economic Development Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Kingbull Economic Development Co Ltd filed Critical Wuhan Kingbull Economic Development Co Ltd
Priority to CN202010053025.3A priority Critical patent/CN111168961A/en
Publication of CN111168961A publication Critical patent/CN111168961A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • 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
    • 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
    • B29C45/74—Heating or cooling of the injection unit
    • 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
    • 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
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/14—Copolymers of polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles

Abstract

The invention discloses a method for improving the problem of internal cavities of injection molding thick-wall PPR pipe fittings, which comprises the following steps: 1. mounting the forming mold on an injection molding machine, connecting the forming mold with a mold temperature controller, and controlling the temperature of the forming mold to 40-70 deg.C by a mold controllerDEG C; 2. heating a charging barrel of an injection device to a preset temperature, and adding raw materials into the charging barrel of the injection device to heat into a fluid melt; 3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die; 4. after the injection and filling are finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 30-90Pa, the primary pressure maintaining time is 30-70s, and the primary pressure maintaining speed is 10-55cm3The second-stage pressure maintaining pressure is 30-90Pa, the second-stage pressure maintaining time is 30-70s, and the second-stage pressure maintaining speed is 10-55cm3S; 5. and after the pressure maintaining is finished, cooling for 180-300s, and opening the die after cooling to obtain the PPR pipe fitting. The method is simple and convenient to operate, and can effectively solve the problem that the inner wall of the thick-wall PPR pipe fitting generates a cavity in the forming process.

Description

Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting
Technical Field
The invention relates to the technical field of injection molding, in particular to a method for improving the problem of an internal cavity of an injection molding thick-wall PPR pipe fitting.
Background
In the production of the PPR pipe fitting of moulding plastics, especially thick wall PPR pipe fitting that wall thickness more than or equal to 3mm, because material mobility and back shrink reason, the very easy inside cavity that produces in the pipe fitting, inside cavity problem has produced great influence to the pipe fitting bearing capacity, has seriously influenced product quality, to the user, uses this kind of PPR pipe fitting that has the inner wall cavity, has caused the hidden danger of leaking easily.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for improving the problem of the inner cavity of the injection molding thick-wall PPR pipe fitting, which is simple and convenient to operate, and can effectively improve the problem of the inner wall cavity generated in the molding process of the thick-wall PPR pipe fitting (the wall thickness is more than 3 mm).
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a method for improving the problem of internal cavities of injection molding thick-wall PPR pipe fittings comprises the following steps:
1. mounting a forming die on an injection molding machine, connecting a die temperature controller with a circulating pipeline of the forming die through a water pipe, and controlling the temperature of liquid in the circulating pipeline of the forming die to be 40-70 ℃ through a model machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection and filling are finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 30-90Pa, the primary pressure maintaining time is 30-70s, and the primary pressure maintaining speed is 10-55cm3The second-stage pressure maintaining pressure is 30-90Pa, the second-stage pressure maintaining time is 30-70s, and the second-stage pressure maintaining speed is 10-55cm3/s；
5. And after the pressure maintaining is finished, cooling the molding cavity of the molding die for 180-300s, and after the cooling is finished, opening the die to obtain the PPR pipe fitting.
Further, the thickness of PPR pipe fitting be greater than 3 mm.
Compared with the prior art, the invention has the beneficial effects and advantages that:
in the PPR pipe fitting injection moulding process, the temperature of a forming cavity of a forming mould is controlled by additionally arranging a mould temperature controller, the pressure, the speed and the time in the pressure maintaining process and the cooling time are controlled, the flowability of a plastic material in the forming cavity of the forming mould is improved, the plastic material is prevented from shrinking after forming, the problem that the inner wall of the injection PPR pipe fitting generates a cavity is effectively solved, and in the actual production process, after the method is used, the probability that the inner wall of the PPR pipe fitting generates the cavity is reduced by at least more than 20%.
Drawings
FIG. 1 is an X-ray inspection diagram of the void generated on the inner wall of the electromagnetic hot-melt integrated constant diameter pipe sleeve 32 produced in comparative example 1.
FIG. 2 is an X-ray detection diagram of a cavity generated on the inner wall of the electromagnetic hot melting integrated equal-diameter tee 32 produced in comparative example 1.
Fig. 3 is an X-ray detection diagram of the void generated on the inner wall of the electromagnetic hot-melt integrated 90-degree elbow 32 produced in the comparative example 1.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
Example 1
An aerospace injection molding machine (MA3000) is adopted to produce the electromagnetic hot-melting integrated constant-diameter pipe sleeve 32, and the specific steps are as follows:
1. mounting a forming die on an injection molding machine, connecting a die temperature controller with a circulating pipeline of the forming die through a water pipe, and controlling the temperature of liquid in the circulating pipeline of the forming die to be 45 ℃ through a model machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection filling is finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 38Pa, the primary pressure maintaining time is 40s, and the primary pressure maintaining speed is 20cm3The second-stage pressure maintaining pressure is 35Pa, the second-stage pressure maintaining time is 30s, and the second-stage pressure maintaining speed is 15cm3/s；
5. And after the pressure maintaining is finished, cooling the molding cavity of the molding die for 200s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated constant-diameter pipe sleeve 32 with the wall thickness of 4 mm.
In the actual production process, the production of the former products is taken as the preheating process of the forming cavity of the forming die when the production is started.
Comparative example 1
An aerospace injection molding machine (MA3000) is adopted to produce the electromagnetic hot-melting integrated constant-diameter pipe sleeve 32, and the specific steps are as follows:
1. mounting a forming mold on an injection molding machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection filling is finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 38Pa, the primary pressure maintaining time is 20s, and the primary pressure maintaining speed is 20cm3The second-stage pressure maintaining pressure is 35Pa, the second-stage pressure maintaining time is 15s, and the second-stage pressure maintaining speed is 15cm3/s；
5. And after the pressure maintaining is finished, cooling the forming cavity of the forming die for 80s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated constant-diameter pipe sleeve 32 with the wall thickness of 4 mm.
The method of the embodiment 1 and the method of the comparative example 1 are adopted to respectively produce 100 electromagnetic hot-melting integrated constant-diameter pipe sleeves 32, the upper inner walls of the 200 electromagnetic hot-melting integrated constant-diameter pipe sleeves 32 are subjected to cavity generation by an X-ray flaw detector, and the results show that 22 products of the 100 electromagnetic hot-melting integrated constant-diameter pipe sleeves 32 processed by the method of the comparative example 1 have the problem of internal cavities, the probability of the internal cavities is 22%, and the detection result of one product is shown in FIG. 1; on the other hand, the 100 electromagnetic hot-melt integrated constant diameter pipe sleeves 32 processed by the method of example 1 did not show any internal void problem.
Example 2
An electromagnetic hot-melting integrated equal-diameter tee joint 32 is produced by adopting a Haitian injection molding machine (MA3600), and the method comprises the following specific steps:
1. installing a forming die on an injection molding machine, connecting a die temperature controller with a circulating pipeline of the forming die through a water pipe, and controlling the temperature of liquid in the circulating pipeline of the forming die to be 55 ℃ through a model machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection filling is finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 55Pa, the primary pressure maintaining time is 50s, and the primary pressure maintaining speed is 32cm3The second-stage pressure maintaining pressure is 50Pa, the second-stage pressure maintaining time is 40s, and the second-stage pressure maintaining speed is 26cm3/s；
5. And after the pressure maintaining is finished, cooling the forming cavity of the forming die for 200s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated equal-diameter tee 32 with the wall thickness of 4 mm.
Comparative example 2
An electromagnetic hot-melting integrated equal-diameter tee joint 32 is produced by adopting a Haitian injection molding machine (MA3600), and the method comprises the following specific steps:
1. mounting a forming mold on an injection molding machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection filling is finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 55Pa, the primary pressure maintaining time is 20s, and the primary pressure maintaining speed is 32cm3The second-stage pressure maintaining pressure is 50Pa, the second-stage pressure maintaining time is 20s, and the second-stage pressure maintaining speed is 26cm3/s；
5. And after the pressure maintaining is finished, cooling the forming cavity of the forming die for 100s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated equal-diameter tee 32 with the wall thickness of 4 mm.
The method of the embodiment 2 and the method of the comparative example 2 are adopted to respectively produce 100 electromagnetic hot melting integrated type equal-diameter tee joints 32, the cavities are generated on the upper inner wall of the 200 electromagnetic hot melting integrated type equal-diameter tee joints 32 by using an X-ray flaw detector, and the results show that 27 products of the 100 electromagnetic hot melting integrated type equal-diameter tee joints 32 processed by the method of the comparative example 1 have the problem of internal cavities, the probability of the internal cavities is 27 percent, and the detection result of one product is shown in figure 2; however, only 2 products of the 100 electromagnetic hot-melting integrated equal-diameter tee 32 processed by the method of embodiment 1 have the problem of internal cavities, and the probability of generating the internal cavities is 2%.
Example 3
An electromagnetic hot-melting integrated 90-degree elbow 32 is produced by adopting a Haitian injection molding machine (MA4500), and the specific steps are as follows:
1. mounting a forming die on an injection molding machine, connecting a die temperature controller with a circulating pipeline of the forming die through a water pipe, and controlling the temperature of liquid in the circulating pipeline of the forming die to be 60 ℃ through a model machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection and filling are finished, the pressure is maintained,the primary pressure maintaining pressure is 48Pa, the primary pressure maintaining time is 50s, and the primary pressure maintaining speed is 40cm3The second-stage pressure maintaining pressure is 43Pa, the second-stage pressure maintaining time is 50s, and the second-stage pressure maintaining speed is 35cm3/s；
5. And after the pressure maintaining is finished, cooling the molding cavity of the molding die for 255s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated 90-degree elbow 32 with the wall thickness of 4 mm.
Comparative example 3
An electromagnetic hot-melting integrated 90-degree elbow 32 is produced by adopting a Haitian injection molding machine (MA4500), and the specific steps are as follows:
1. mounting a forming mold on an injection molding machine;
2. heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
3. after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
4. after the injection filling is finished, pressure maintaining is carried out, the primary pressure maintaining pressure is 48Pa, the primary pressure maintaining time is 26s, and the primary pressure maintaining speed is 40cm3The second-stage pressure maintaining pressure is 43Pa, the second-stage pressure maintaining time is 20s, and the second-stage pressure maintaining speed is 35cm3/s；
5. And after the pressure maintaining is finished, cooling the molding cavity of the molding die for 150s, and after the cooling is finished, opening the die to obtain the electromagnetic hot melting integrated 90-degree elbow 32 with the wall thickness of 4 mm.
The method of the embodiment 3 and the method of the comparative example 3 are adopted to respectively produce 100 electromagnetic hot-melting integrated 90-degree elbows 32, the cavities are generated on the upper inner wall of the 200 electromagnetic hot-melting integrated 90-degree elbow 32 products by using an X-ray flaw detector, and the results show that 24 products have the problem of internal cavities, the probability of internal cavity generation is 24 percent, and the detection result of one product is shown in FIG. 3; however, only 1 product of 100 electromagnetic hot-melting integrated 90-degree elbows 32 processed by the method of embodiment 1 has the problem of internal cavities, and the probability of internal cavity generation is 1%.

Claims (2)

1. A method for improving the problem of the inner cavity of an injection molding thick-wall PPR pipe fitting is characterized by comprising the following steps:
1.1, mounting a forming die on an injection molding machine, connecting a die temperature controller with a circulating pipeline of the forming die through a water pipe, and controlling the temperature of liquid in the circulating pipeline of the forming die to be 40-70 ℃ through a model machine;
1.2, heating a charging barrel of the injection device to enable the temperature in the charging barrel of the injection device to reach a preset temperature, adding raw materials into the charging barrel of the injection device, and heating and melting the raw materials into a fluid melt;
1.3, after the die assembly is finished, injecting fluid melt into a forming cavity of a forming die through an injection device;
1.4, after the injection and filling are finished, maintaining the pressure, wherein the primary pressure maintaining pressure is 30-90Pa, the primary pressure maintaining time is 30-70s, and the primary pressure maintaining speed is 10-55cm3The second-stage pressure maintaining pressure is 30-90Pa, the second-stage pressure maintaining time is 30-70s, and the second-stage pressure maintaining speed is 10-55cm3/s；
And 1.5, cooling the molding cavity of the molding die for 180-300s after pressure maintaining is finished, and opening the die after cooling is finished to obtain the PPR pipe fitting.
2. The method for improving the problem of the inner hollow of the injection molding thick-wall PPR pipe fitting according to claim 1, is characterized in that: the thickness of PPR pipe fitting be greater than 3 mm.
CN202010053025.3A 2020-01-17 2020-01-17 Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting Pending CN111168961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010053025.3A CN111168961A (en) 2020-01-17 2020-01-17 Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010053025.3A CN111168961A (en) 2020-01-17 2020-01-17 Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting

Publications (1)

Publication Number Publication Date
CN111168961A true CN111168961A (en) 2020-05-19

Family

ID=70624602

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010053025.3A Pending CN111168961A (en) 2020-01-17 2020-01-17 Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting

Country Status (1)

Country Link
CN (1) CN111168961A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114454422A (en) * 2022-01-12 2022-05-10 联塑科技发展(贵阳)有限公司 Injection molding method of PPR pipe fitting with metal insert

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114454422A (en) * 2022-01-12 2022-05-10 联塑科技发展(贵阳)有限公司 Injection molding method of PPR pipe fitting with metal insert

Similar Documents

Publication Publication Date Title
CA2060461C (en) Method for manufacturing a plastic hollow product using water soluble resin
CN105855819A (en) Manufacturing method for conformal cooling channels in steel injection mold
US10086547B2 (en) Molding system and method for directly gas-cooling a molding object
KR101824486B1 (en) 3D rapid heating and cooling structures and the method of the mold
CN105365173A (en) Quick thermoplastic forming process
CN111168961A (en) Method for improving inner cavity problem of injection molding thick-wall PPR pipe fitting
CN105835300A (en) High fineness and no-weldlines injection moulding process
CN101497235A (en) Production facility and production method of plastic pipeline for on-line diameter changing
CN108602230A (en) Injection molding for injection molding machine and blow mold
US3649409A (en) Process for lining a plastic cylinder with another plastic
JPH10100156A (en) Method for obtaining molded product of injection compression molding of thermoplastic resin having high quality appearance
CN105034266A (en) Injection molding mold of medical imaging X-ray film thin wall backlight box, and injection molding process thereof
CN108790004A (en) A kind of resistance to boiling suction nozzle and its production method
CN111055465B (en) Mold temperature and pressure control injection molding process and control system for highlight injection molding part
CN205167405U (en) Intelligence control by temperature change formula injection mold
CN206484821U (en) A kind of injection mould that can quickly cool down
CN102896767A (en) Temperature adjustment device for mandrel in one-step-method injection-blow moulding equipment
CN102990881A (en) Water-assisted injection molding process method
CN206825795U (en) A kind of pressure injection-moulded shaped device of plastic pipe
CN209207892U (en) A kind of charging barrel of injection molding machine
CN207465868U (en) A kind of thermoplastic tube end hemmer
CN205767335U (en) A kind of injection mold with heat insulation function
CN204687289U (en) A kind of injection moulding plasticizing charging barrel
JP2002059468A (en) Method for injection-molding plastics and device therefor
CN205818381U (en) A kind of high-accuracy high-efficiency rate injection mold

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination