CN112297332A - Degradable plastic injection molding process and application - Google Patents
Degradable plastic injection molding process and application Download PDFInfo
- Publication number
- CN112297332A CN112297332A CN202010870452.0A CN202010870452A CN112297332A CN 112297332 A CN112297332 A CN 112297332A CN 202010870452 A CN202010870452 A CN 202010870452A CN 112297332 A CN112297332 A CN 112297332A
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- China
- Prior art keywords
- injection molding
- injection
- raw material
- pressure
- molding process
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Classifications
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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
- B29C45/03—Injection moulding apparatus
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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
- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/043—PGA, i.e. polyglycolic acid or polyglycolide
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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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/04—Polyesters derived from hydroxycarboxylic acids
- B29K2067/046—PLA, i.e. polylactic acid or polylactide
Abstract
The invention relates to a degradable plastic injection molding process and application, comprising the following steps: the method comprises the following steps: injecting the injection molding raw material into a storage barrel of an injection molding machine, setting the heating temperature of a screw in the storage barrel to 215-235 ℃, extruding and melting the injection molding raw material and maintaining the injection molding raw material in a molten state; step two: adjusting the temperature of the fixed die and the movable die to 25-80 ℃; step three: setting the injection pressure at 130-140bar, the injection time at 3-4s and the injection speed at 800-1500mm/s, and injecting after the mold is closed; step four: after the injection is finished, the injection enters a pressure maintaining state, the pressure maintaining pressure is set to be 110-120bar, and the pressure maintaining time is set to be 0.3-2 s; step five: cooling for 5-20s after pressure maintaining; step six: and opening the mold, and taking out the product after demolding. According to the invention, parameters such as melting temperature of the injection molding raw material, stability of the fixed die and the movable die, injection molding pressure and the like are strictly controlled based on the degradable characteristics of the degradable material, so that the injection molding raw material is ensured to be maintained in a stable state in the injection molding process, and the quality and stability of the product are improved.
Description
Technical Field
The invention relates to the technical field of injection molding processing, in particular to an injection molding process and application of degradable plastic.
Background
The injection molding processing is one of the main modes for processing plastic products at present, the raw materials for injection molding at present are rubber and plastic, along with the development of the medical industry, the application of injection molding parts in medical products is more and more extensive, and some medical products used in human bodies are often required to have degradability, so that the injection molding raw materials also need to adopt degradable materials.
Disclosure of Invention
In order to solve the technical problems, the invention provides an injection molding process and application of degradable plastics, and has the advantage of improving the injection molding stability.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a degradable plastic injection molding process comprises the following steps:
the method comprises the following steps: injecting the injection molding raw material into a storage barrel of an injection molding machine, setting the heating temperature of a screw in the storage barrel to 215-235 ℃, extruding and melting the injection molding raw material and maintaining the injection molding raw material in a molten state;
step two: adjusting the temperature of the fixed die and the movable die to 25-80 ℃;
step three: setting the injection pressure at 130-140bar, the injection time at 3-4s and the injection speed at 800-1500mm/s, and injecting after the mold is closed;
step four: after the injection is finished, the injection enters a pressure maintaining state, the pressure maintaining pressure is set to be 110-120bar, and the pressure maintaining time is set to be 0.3-2 s;
step five: cooling for 5-20s after pressure maintaining;
step six: and opening the mold, and taking out the product after demolding.
In a preferred embodiment of the present invention, the injection molding material is PLA or PGA.
As a preferable scheme of the invention, the injection molding raw material is dried for 5-6.5h under the conditions of 100-120 ℃ before being injected into an injection molding machine.
The technical proposal is realized by adopting the method,
in a preferable scheme of the invention, the clamping force of the mold clamping in the third step is 30-35 PSI.
As a preferable scheme of the invention, the back pressure of a screw rod set in the storage cylinder is 3kg/cm2。
In another aspect, the invention also provides the use of the degradable plastic injection molding process in tissue clip processing.
In a preferred embodiment of the present invention, the tissue clip is injection molded from PLA.
On the other hand, the invention also provides the application of the degradable plastic injection molding process in the precision gear machining.
In a preferred embodiment of the present invention, the precision gear is injection molded using PGA.
In conclusion, the invention has the following beneficial effects:
according to the injection molding process and application of the degradable plastic, parameters such as the melting temperature of the injection molding raw material, the stability of the fixed mold and the movable mold, the injection molding pressure and the like are strictly controlled based on the degradable characteristics of the degradable material, so that the injection molding raw material is maintained in a stable state in the injection molding process, the quality and stability of the product are improved, the application range of the degradable plastic is expanded, and the application and the optimized upgrading of medical products are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a process flow diagram of a first embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A degradable plastic injection molding process, as shown in fig. 1, comprising:
the method comprises the following steps: injecting an injection molding raw material into a storage barrel of an injection molding machine, setting the heating temperature of a screw in the storage barrel to be 215-235 ℃, extruding and melting the injection molding raw material and maintaining the injection molding raw material in a molten state, specifically, the injection molding raw material can be PLA or PGA, and before the injection molding raw material is injected into the injection molding machine, drying is performed for 5-6.5 hours under the condition of 100-120 ℃, specifically, drying is performed for 6 hours under the condition of 100 ℃, and the backpressure of the screw in the storage barrel is set to be 3kg/cm2So as to ensure the stable injection of the injection molding raw material.
Step two: the temperature of the fixed die and the movable die is adjusted to 25-80 ℃, and the specific temperature is set according to the requirements of products and the structure of the die.
Step three: the injection pressure is set to be 130-140bar, the injection time is 3-4s, the injection speed is set to be 800-1500mm/s, the injection is carried out after the mold is closed, and the mold locking force is kept to be 30-35PSI during mold closing, in the embodiment, the injection pressure is 135bar, the injection time is 4s, the injection speed is 1200mm/s, and the mold locking force is 30 PSI.
Step four: and entering a pressure maintaining state after the injection is finished, wherein the pressure maintaining pressure is set to be 110-120bar, the pressure maintaining time is set to be 0.3-2s, the pressure maintaining pressure is set to be 115bar in the embodiment, and the pressure maintaining time is 1.5 s.
Step five: and cooling for 5-20s after the pressure maintaining is finished.
Step six: and opening the mold, and taking out the product after demolding.
The embodiment of the invention strictly controls the parameters of the melting temperature of the injection molding raw material, the stability of the fixed die and the movable die, the injection molding pressure and the like based on the degradable characteristics of the degradable material, ensures that the injection molding raw material is maintained in a stable state in the injection molding process, improves the quality and the stability of the product, simultaneously expands the application range of the degradable plastic, and is convenient for the application and the optimized upgrade of medical products.
Example two
A tissue clamp, which is formed by the injection molding process of the degradable plastic as described in the first embodiment, is injection molded by using PLA as the injection molding raw material.
EXAMPLE III
A precision gear is processed and formed by the degradable plastic injection molding process in the embodiment I, and the precision gear is injection molded by taking PGA as an injection molding raw material.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A degradable plastic injection molding process is characterized by comprising the following steps:
the method comprises the following steps: injecting the injection molding raw material into a storage barrel of an injection molding machine, setting the heating temperature of a screw in the storage barrel to 215-235 ℃, extruding and melting the injection molding raw material and maintaining the injection molding raw material in a molten state;
step two: adjusting the temperature of the fixed die and the movable die to 25-80 ℃;
step three: setting the injection pressure at 130-140bar, the injection time at 3-4s and the injection speed at 800-1500mm/s, and injecting after the mold is closed;
step four: after the injection is finished, the injection enters a pressure maintaining state, the pressure maintaining pressure is set to be 110-120bar, and the pressure maintaining time is set to be 0.3-2 s;
step five: cooling for 5-20s after pressure maintaining;
step six: and opening the mold, and taking out the product after demolding.
2. The injection molding process of degradable plastics according to claim 1, wherein the injection molding material is PLA or PGA.
3. The injection molding process of degradable plastic as claimed in claim 1, wherein the injection molding material is dried at 120 ℃ for 5-6.5h before being injected into the injection molding machine.
4. The injection molding process of degradable plastics according to claim 1, wherein the mold clamping force of the mold in step three is 30-35 PSI.
5. The injection molding process of degradable plastics according to claim 1, wherein the back pressure of the screw rod set in the storage cylinder is 3kg/cm2。
6. Use of the injection molding process of degradable plastic according to any one of claims 1-5 in tissue clip processing.
7. The use of claim 6, wherein the tissue clip is injection molded from PLA.
8. Use of the degradable plastic injection molding process according to any one of claims 1 to 5 in precision gear machining.
9. Use according to claim 8, wherein the precision gear is injection moulded from PGA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010870452.0A CN112297332A (en) | 2020-08-26 | 2020-08-26 | Degradable plastic injection molding process and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010870452.0A CN112297332A (en) | 2020-08-26 | 2020-08-26 | Degradable plastic injection molding process and application |
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| Publication Number | Publication Date |
|---|---|
| CN112297332A true CN112297332A (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010870452.0A Pending CN112297332A (en) | 2020-08-26 | 2020-08-26 | Degradable plastic injection molding process and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113183405A (en) * | 2021-05-04 | 2021-07-30 | 普力达新材料科技(深圳)有限公司 | Fully-degradable tableware and preparation method thereof |
| CN113667190A (en) * | 2021-05-18 | 2021-11-19 | 广州城建职业学院 | Biodegradable modified starch-based toy material and preparation method of toy thereof |
-
2020
- 2020-08-26 CN CN202010870452.0A patent/CN112297332A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 袁露等: "《资源环境科学与工程专业实验》", 30 December 2016, 湖南师范大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113183405A (en) * | 2021-05-04 | 2021-07-30 | 普力达新材料科技(深圳)有限公司 | Fully-degradable tableware and preparation method thereof |
| CN113667190A (en) * | 2021-05-18 | 2021-11-19 | 广州城建职业学院 | Biodegradable modified starch-based toy material and preparation method of toy thereof |
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Application publication date: 20210202 |
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