CN113895060A - Use PLA to be full-degradable plastic products crystallization equipment many times as main base material - Google Patents
Use PLA to be full-degradable plastic products crystallization equipment many times as main base material Download PDFInfo
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- CN113895060A CN113895060A CN202111325573.8A CN202111325573A CN113895060A CN 113895060 A CN113895060 A CN 113895060A CN 202111325573 A CN202111325573 A CN 202111325573A CN 113895060 A CN113895060 A CN 113895060A
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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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
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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
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Abstract
The invention discloses a multi-time crystallization device for a fully-degradable plastic product taking PLA as a main base material, which is operated by a multi-time crystallization process of the device to improve the thermal deformation temperature of the fully-degradable plastic product taking PLA as the main base material. The multi-time crystallization equipment comprises a first area, a second area, a third area, a fourth area, a fifth area and a sixth area, wherein all the areas are connected by a conveyor belt made of a teflon gauze; heating pipes are arranged right above the first zone, the third zone and the fifth zone to finish the temperature rise process; refrigerating units are arranged above the second area, the fourth area and the sixth area to finish a plurality of cooling processes, so that the purpose of crystallizing plastic products for a plurality of times is achieved, and the thermal deformation temperature of the fully-degradable plastic products taking PLA as a main base material is increased.
Description
Technical Field
The invention relates to the technical field of PLA production, in particular to a repeated crystallization device for a fully-degradable plastic product with PLA as a main base material.
Background
Polylactic acid, also known as polylactide, is a polyester polymer obtained by polymerizing lactic acid as a main raw material, and is a novel biodegradable material. Polylactic acid has good thermal stability and good solvent resistance and can be processed in various ways, such as extrusion, spinning, biaxial stretching, and injection blow molding. The product made of polylactic acid can be biodegraded, and has good biocompatibility, glossiness, transparency, hand feeling and heat resistance.
Use polylactic acid as the in-process of base material full degradation plastic products at the production and processing preparation, carry the plastic products through the conveyer belt and heat the department in each region, and heat behind the processing rethread air-blower and cool down the processing to it, the mode of lift cooling is for cooling plastic products, make and crystallize, thereby promote goods temperature toleration, but current technique is through the air-blower cooling to it, the use of air-blower belongs to the material cooling, but the air-blower can't refrigerate, secondly the air-blower still does not possess the effect of control by temperature change, lead to the cooling efficiency to plastic products limited, thin wall goods still easily take place the type and become. Therefore, we propose a multi-crystallization device for fully-degradable plastic products with PLA as the main base material.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art and provides a multi-crystallization device for fully-degradable plastic products by taking PLA as a main base material.
In order to achieve the purpose, the invention adopts the following technical scheme that the repeated crystallization equipment for the fully-degradable plastic product with PLA as the main base material comprises repeated crystallization equipment, wherein the repeated crystallization equipment comprises a first area, a second area, a third area, a fourth area, a fifth area and a sixth area, all the areas are linearly connected by a conveyor belt, the conveyor belt is made of a teflon gauze, a heating pipe is arranged right above the conveyor belt, refrigerating units are arranged on the second area, the fourth area and the sixth area respectively, the corresponding refrigerating units are integrated with the second area, the fourth area and the sixth area respectively, the refrigerating units are integrated with the upper ends of the equipment in the corresponding areas, the refrigerating temperature range of the refrigerating units is 10-30 ℃, and the refrigerating units can realize temperature and air volume adjustment.
Preferably, the temperature control switches of the first zone, the second zone, the third zone, the fourth zone, the fifth zone, the sixth zone and the corresponding three groups of refrigerating units are all independently designed, so that the maintenance is convenient.
Preferably, the first zone, the second zone, the third zone, the fourth zone, the fifth zone and the sixth zone are provided with visible windows, so that the crystallization and deformation conditions of the product can be observed conveniently.
Preferably, the first zone, the second zone, the third zone, the fourth zone, the fifth zone and the sixth zone are all steel closed structures except the visible windows.
Preferably, the temperature control range of the first zone is 50-120 ℃, the temperature control range of the second zone is controlled by the refrigerating unit through air cooling, the temperature control range of the third zone is 50-120 ℃, the temperature control range of the fourth zone is controlled by the refrigerating unit through air cooling, the temperature control range of the fifth zone is 50-120 ℃, and the temperature control range of the sixth zone is controlled by the refrigerating unit through air cooling.
A use method of multiple crystallization equipment for fully-degradable plastic products with PLA as a main base material comprises the following working steps:
the first step is as follows: conveying the normal temperature resistant plastic product to a first area by a conveyor belt, heating the normal temperature resistant plastic product in the first area at the temperature control range of 50-120 ℃, and conveying the plastic product to a second area by the conveyor belt after heating in the first area;
the second step is that: when the plastic product is conveyed into the second area by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the second area, a refrigerating unit in a temperature control range of the second area is controlled, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated through the first area, enters the second area and is rapidly cooled in the second area by air cooling, the surface of the plastic product starts to crystallize at the moment, and the plastic product after the surface starts to crystallize is conveyed to the third area by the conveyor belt;
the third step: after the plastic product with the surface beginning to crystallize is conveyed to the three zones by the conveyor belt, the temperature control range of the three zones is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the three zones, the plastic product is conveyed to the four zones by the conveyor belt;
the fourth step: when the plastic product is conveyed into the four zones by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the four zones, a refrigerating unit in a temperature control range of the four zones controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the three zones and quickly cooled by air in the four zones, the surface of the plastic product starts to crystallize again at the moment, and the plastic product after the surface starts to crystallize is conveyed into the five zones by the conveyor belt;
the fifth step: after the plastic product with the surface beginning to crystallize is conveyed to five areas by a conveyor belt, the temperature control range of the five areas is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the five areas, the plastic product is conveyed to six areas by the conveyor belt;
and a sixth step: when the plastic product is conveyed to the six areas by the conveyor belt, the heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed to the six areas, the refrigerating unit with the temperature control range of the six areas controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the five areas and is rapidly cooled by air in the six areas, the surface of the plastic product begins to crystallize again, the plastic product with the surface crystallized is finally conveyed out by the conveyor belt, and the high-temperature resistant plastic product is manufactured.
Preferably, in the second step, the fourth step and the sixth step, the heated plastic product is cooled by air cooling, and the surface of the plastic product begins to crystallize, so that the surface of the plastic product forms a compact high-temperature resistant crystal structure, thereby improving the high-temperature resistance of the product and forming the high-temperature resistant plastic product.
Advantageous effects
The invention provides a multi-time crystallization device for a fully-degradable plastic product taking PLA as a main base material. The method has the following beneficial effects:
(1) the invention relates to a multi-time crystallization device for a fully-degradable plastic product with PLA as a main base material, which adopts a multi-time refrigerating unit to cool, realizes that multiple plastic products can be crystallized for multiple times, and realizes that the thermal deformation temperature requirement of the fully-degradable plastic product with PLA as the main base material can be set, thereby realizing the purpose of high temperature resistance and adjustability.
(2) The invention relates to a multiple crystallization device for a fully-degradable plastic product with PLA as a main base material, which utilizes the PLA (polylactic acid) crystallization principle, transmits the normal temperature resistant plastic product by a conveyor belt to sequentially pass from one area to six areas, and performs multiple crystallization on the product under the conditions of temperature rise and rapid air cooling, thereby improving the high temperature resistance of the product and forming the high temperature resistant plastic product.
(3) According to the repeated crystallization equipment for the fully-degradable plastic product with the PLA as the main base material, in the high-temperature resistant treatment process of the plastic product, the plastic crystallization effect is influenced by four variables, namely the product transmission speed, the refrigeration temperature and the air volume, the raw material formula and the heating temperature, and if the deformation occurs in the processing process, the four variables can be adjusted, so that the production efficiency of manufacturing the high-temperature resistant plastic is improved.
(4) According to the multi-crystallization device for the fully-degradable plastic product with the PLA as the main base material, all areas are connected and conveyed through the conveyor belt, the conveyor belt is linearly connected and consists of the Teflon gauze, the heating pipe is arranged right above the conveyor belt, and the rest of the equipment except the visible window is of a steel closed structure, so that the strength and the rigidity of the whole equipment are improved, and the stability of the structure of the equipment is improved integrally.
(5) According to the repeated crystallization equipment for the fully-degradable plastic product with PLA as the main base material, the second area, the fourth area and the sixth area are respectively provided with the refrigerating fans, the refrigerating temperature can be adjusted to be 10-30 ℃ according to the range, and the temperature and the air volume can be adjusted.
(6) According to the repeated crystallization equipment for the fully-degradable plastic product with PLA as the main base material, the first area, the second area, the third area, the fourth area, the fifth area and the sixth area are provided with the visual windows, so that the crystallization effect of the product can be observed conveniently, and the temperature control switches of the first area, the second area, the third area, the fourth area, the fifth area, the sixth area and the corresponding three groups of refrigerating units are designed independently, so that the repeated crystallization equipment is convenient to overhaul and maintain, and the practicability of the repeated crystallization equipment is improved.
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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of the apparatus of the present invention;
FIG. 2 is a flow chart of a method of use of the present 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 (b): a multi-time crystallization device for fully-degradable plastic products with PLA as a main base material comprises a multi-time crystallization device, the multi-time crystallization device comprises a first area, a second area, a third area, a fourth area, a fifth area and a sixth area, all the areas are linearly connected by a conveyor belt, the conveyor belt is made of a Teflon gauze, a heating pipe is arranged right above the conveyor belt, refrigerating units are arranged on the second area, the fourth area and the sixth area respectively, the corresponding refrigerating units are integrally designed with the second area, the fourth area and the sixth area respectively, the refrigerating units are integrated with the upper ends of the corresponding area devices, the refrigerating temperature range of the refrigerating units is 10-30 ℃, the refrigerating units can realize temperature and air volume adjustment, temperature control switches of the first area, the second area, the third area, the fourth area, the fifth area, the sixth area and the corresponding three groups of refrigerating units are independently designed, overhaul and maintenance are convenient, and the first area, the second area, the fifth area and the sixth area are independent area, The three, four, five and six zones are provided with visible windows, so that the crystallization and deformation conditions of the product can be observed conveniently, the visible windows of the first, second, third, fourth, fifth and sixth zones are all steel closed structures, the temperature control range of the first zone is 50-120 ℃, the temperature control range of the second zone is controlled by a refrigerating unit through air cooling, the temperature control range of the third zone is 50-120 ℃, the temperature control range of the fourth zone is controlled by the refrigerating unit through air cooling, the temperature control range of the fifth zone is 50-120 ℃, and the temperature control range of the sixth zone is controlled by the refrigerating unit through air cooling.
A use method of multiple crystallization equipment for fully-degradable plastic products with PLA as a main base material is characterized in that: the method comprises the following working steps:
the first step is as follows: conveying the normal temperature resistant plastic product to a first area by a conveyor belt, heating the normal temperature resistant plastic product in the first area at the temperature control range of 50-120 ℃, and conveying the plastic product to a second area by the conveyor belt after heating in the first area;
the second step is that: when the plastic product is conveyed into the second area by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the second area, a refrigerating unit in a temperature control range of the second area is controlled, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated through the first area, enters the second area and is rapidly cooled in the second area by air cooling, the surface of the plastic product starts to crystallize at the moment, and the plastic product after the surface starts to crystallize is conveyed to the third area by the conveyor belt;
the third step: after the plastic product with the surface beginning to crystallize is conveyed to the three zones by the conveyor belt, the temperature control range of the three zones is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the three zones, the plastic product is conveyed to the four zones by the conveyor belt;
the fourth step: when the plastic product is conveyed into the four zones by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the four zones, a refrigerating unit in a temperature control range of the four zones controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the three zones and quickly cooled by air in the four zones, the surface of the plastic product starts to crystallize again at the moment, and the plastic product after the surface starts to crystallize is conveyed into the five zones by the conveyor belt;
the fifth step: after the plastic product with the surface beginning to crystallize is conveyed to five areas by a conveyor belt, the temperature control range of the five areas is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the five areas, the plastic product is conveyed to six areas by the conveyor belt;
and a sixth step: when the plastic product is conveyed to the six areas by the conveyor belt, the heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed to the six areas, the refrigerating unit with the temperature control range of the six areas controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the five areas and is rapidly cooled by air in the six areas, the surface of the plastic product begins to crystallize again, the plastic product with the surface crystallized is finally conveyed out by the conveyor belt, and the high-temperature resistant plastic product is manufactured.
And in the second step, the fourth step and the sixth step, the heated plastic product is cooled by air cooling, the surface of the plastic product begins to crystallize, and a compact high-temperature-resistant crystal structure is formed on the surface of the plastic product, so that the high-temperature resistance of the product is improved, and the high-temperature-resistant plastic product is formed.
The invention utilizes PLA (polylactic acid) crystallization principle, normal temperature resistant plastic products are conveyed by a conveyor belt to sequentially pass through a first zone to a sixth zone, and the surfaces of the products are crystallized for multiple times under the conditions of temperature rise and quick air cooling, so that compact high temperature resistant crystal structures are formed on the surfaces of the products, thereby improving the high temperature resistance of the products and forming the high temperature resistant plastic products.
In the process of carrying out high-temperature resistant treatment on the plastic product, the plastic crystallization effect of the plastic product is influenced by four variables, namely the product transmission speed, the refrigeration temperature and air volume, the raw material formula and the heating temperature, and if the processing process is deformed, the four variables can be adjusted, so that the production efficiency of manufacturing the high-temperature resistant plastic is improved.
All the areas of the invention are connected and transmitted through the conveyor belts, the conveyor belts are linearly connected, the conveyor belts are composed of Teflon gauze, heating pipes are arranged right above the conveyor belts, except visual windows, the rest parts are steel closed structures, the integral strength and rigidity of the invention are improved, and the structural stability of the invention is improved integrally.
Compared with the prior art that the air blower is adopted for physical cooling, the invention solves the problem that the prior art has no refrigeration and temperature control functions, and simultaneously solves the problem that the physical cooling efficiency is lower in the prior art.
The first zone, the second zone, the third zone, the fourth zone, the fifth zone and the sixth zone are respectively provided with the visible window, so that the crystallization effect of a product can be observed conveniently, and the temperature control switches of the first zone, the second zone, the third zone, the fourth zone, the fifth zone, the sixth zone and the corresponding three groups of refrigerating units are designed independently, so that the maintenance is convenient, and the practicability of the invention is improved.
The invention adopts a refrigerating unit for cooling for multiple times, realizes multiple times of crystallization of multiple plastic products, and realizes the setting of the thermal deformation temperature requirement of the fully-degradable plastic product taking PLA as the main base material, thereby realizing the purpose of high temperature resistance and adjustability.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A use PLA as main base material full degradation plastic products crystallization equipment many times, includes crystallization equipment many times, its characterized in that: the repeated crystallization equipment comprises a first area, a second area, a third area, a fourth area, a fifth area and a sixth area, wherein all the areas are linearly connected through a conveyor belt, the conveyor belt is made of a teflon gauze, a heating pipe is arranged right above the conveyor belt, refrigerating units are arranged on the second area, the fourth area and the sixth area, the corresponding refrigerating units are respectively manufactured with the second area, the fourth area and the sixth area in an integrated design, the refrigerating units are integrated with the upper ends of the corresponding area equipment, the refrigerating temperature range of the refrigerating units is 10-30 ℃, and the refrigerating units can realize temperature and air volume adjustment.
2. The multi-crystallization device for fully degradable plastic products with PLA as the main base material as claimed in claim 1 is characterized in that: the temperature control switches of the first zone, the second zone, the third zone, the fourth zone, the fifth zone, the sixth zone and the corresponding three groups of refrigerating units are all independently designed, and the maintenance is convenient.
3. The multi-crystallization device for fully degradable plastic products with PLA as the main base material as claimed in claim 1 is characterized in that: the first zone, the second zone, the third zone, the fourth zone, the fifth zone and the sixth zone are provided with visible windows, so that the crystallization and deformation conditions of the product can be observed conveniently.
4. The multi-crystallization device for fully degradable plastic products with PLA as the main base material as claimed in claim 1 is characterized in that: except the visible window, the first area, the second area, the third area, the fourth area, the fifth area and the sixth area are all steel closed structures.
5. The multi-crystallization device for fully degradable plastic products with PLA as the main base material as claimed in claim 1 is characterized in that: the temperature control range of the first zone is 50-120 ℃, the temperature control range of the second zone is controlled by the refrigerating unit through air cooling, the temperature control range of the third zone is 50-120 ℃, the temperature control range of the fourth zone is controlled by the refrigerating unit through air cooling, the temperature control range of the fifth zone is 50-120 ℃, and the temperature control range of the sixth zone is controlled by the refrigerating unit through air cooling.
6. A use method of multiple crystallization equipment for fully-degradable plastic products with PLA as a main base material is characterized in that: the method comprises the following working steps:
the first step is as follows: conveying the normal temperature resistant plastic product to a first area by a conveyor belt, heating the normal temperature resistant plastic product in the first area at the temperature control range of 50-120 ℃, and conveying the plastic product to a second area by the conveyor belt after heating in the first area;
the second step is that: when the plastic product is conveyed into the second area by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the second area, a refrigerating unit in a temperature control range of the second area is controlled, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated through the first area, enters the second area and is rapidly cooled in the second area by air cooling, the surface of the plastic product starts to crystallize at the moment, and the plastic product after the surface starts to crystallize is conveyed to the third area by the conveyor belt;
the third step: after the plastic product with the surface beginning to crystallize is conveyed to the three zones by the conveyor belt, the temperature control range of the three zones is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the three zones, the plastic product is conveyed to the four zones by the conveyor belt;
the fourth step: when the plastic product is conveyed into the four zones by the conveyor belt, a heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed into the four zones, a refrigerating unit in a temperature control range of the four zones controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the three zones and quickly cooled by air in the four zones, the surface of the plastic product starts to crystallize again at the moment, and the plastic product after the surface starts to crystallize is conveyed into the five zones by the conveyor belt;
the fifth step: after the plastic product with the surface beginning to crystallize is conveyed to five areas by a conveyor belt, the temperature control range of the five areas is 50-120 ℃, the plastic product is heated again, and after the plastic product is heated in the five areas, the plastic product is conveyed to six areas by the conveyor belt;
and a sixth step: when the plastic product is conveyed to the six areas by the conveyor belt, the heating pipe is arranged right above the conveyor belt, the heating pipe can heat and convey the conveyed plastic product, when the plastic product is conveyed to the six areas, the refrigerating unit with the temperature control range of the six areas controls the refrigerating unit, the refrigerating temperature range of the refrigerating unit is 10-30 ℃, the plastic product is heated by the five areas and is rapidly cooled by air in the six areas, the surface of the plastic product begins to crystallize again, the plastic product with the surface crystallized is finally conveyed out by the conveyor belt, and the high-temperature resistant plastic product is manufactured.
7. The use method of the multiple crystallization equipment for the fully degradable plastic products with PLA as the main base material according to the claim 6 is characterized in that: and in the second step, the fourth step and the sixth step, the heated plastic product is cooled by air cooling, and the plastic product undergoes multiple crystallization, so that a compact high-temperature resistant crystal structure is formed on the surface of the plastic product, the high-temperature resistance of the product is improved, and the high-temperature resistant plastic product is formed.
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| CN106553328A (en) * | 2016-12-02 | 2017-04-05 | 厦门百圣润塑胶有限公司 | PET, CPET, PLA and CPLA plastic material sheet heat forming method and system |
| CN110789065A (en) * | 2019-11-11 | 2020-02-14 | 湖南工业大学 | Polylactic acid product out-of-mold crystallization device and method |
| CN212097055U (en) * | 2020-05-06 | 2020-12-08 | 郑州中远干燥工程有限公司 | Conveying and crystallizing device based on polylactic acid slices |
| CN112721248A (en) * | 2020-12-29 | 2021-04-30 | 安徽恒鑫环保新材料有限公司 | Polylactic acid straw crystallization process |
| CN113563701A (en) * | 2021-07-16 | 2021-10-29 | 南京湘虹新材料有限公司 | Preparation method of polylactic acid heat-resistant straw |
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