KR101642268B1 - Manufacturing method of polylactic acid vessel having improved heat-resisting property, polylactic acid vessel manufactured by the manufacturing method, and manufacturing machine of the polylactic acid vessel - Google Patents
Manufacturing method of polylactic acid vessel having improved heat-resisting property, polylactic acid vessel manufactured by the manufacturing method, and manufacturing machine of the polylactic acid vessel Download PDFInfo
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- KR101642268B1 KR101642268B1 KR1020160040219A KR20160040219A KR101642268B1 KR 101642268 B1 KR101642268 B1 KR 101642268B1 KR 1020160040219 A KR1020160040219 A KR 1020160040219A KR 20160040219 A KR20160040219 A KR 20160040219A KR 101642268 B1 KR101642268 B1 KR 101642268B1
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- South Korea
- Prior art keywords
- temperature
- preheating
- polylactic acid
- mold
- mold member
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/002—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/428—Heating or cooling of moulds or mould parts
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/46—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0059—Degradable
- B29K2995/006—Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
A polylactic acid container manufacturing method improved in heat resistance, a polylactic acid container manufactured by the manufacturing method, and an apparatus for producing the polylactic acid container are disclosed.
A polylactic acid container manufacturing apparatus to produce a polylactic acid container comprises a polylactic acid film formed by adding 1 to 5 parts by weight of an additive which is at least one of talc, filler and calcium carbonate to 100 parts by weight of polylactic acid, A polyphasic film supply member for supplying the polyphthalic acid film; A preheating member for preheating the polyphthalate film supplied by the polyphthalate film supplying member within a range of 150 to 250 占 폚; A main heating member for heating the preheated polyphtic acid film via the preheating member for molding; A mold member for molding the poly (ethylacetate) film heated through the main heating member into a desired container form of the poly (lactic acid) container; A temperature holding member for maintaining the temperature of the mold member at a required mold crystallization temperature; And a heat insulating sealing member for adiabatically sealing the mold member against the outside so that cooling of the mold member heated and maintained by the temperature holding member can be prevented, Is kept at the molding crystallization temperature, the poly (ethylacetate) film pulled in for molding with the mold member is crystallized together with the molding in the mold member, and the mold member is brought into contact with the required bottom surface A plurality of upper molds arranged in at least one of the lower and upper molds to form a desired top surface shape of the polylactic acid container; Which transfers the heat applied by the member for molding and crystallization of the entire mold member, Wherein the plurality of heat transfer elements are spaced apart from each other inside the mold member so that the surface temperature of the mold member can be made uniform, wherein each of the heat transfer elements has the same depth from the surface of the mold member Wherein the temperature holding member circulates the circulating fluid to the heat transfer body by heating the circulating fluid and the heat transfer body is a pipe for circulating the circulating fluid circulated in the temperature holding member, A preheating step of maintaining the temperature of the preheating member in a range of 150 to 160 ° C and a preheating step of maintaining the temperature of the preheating member having passed through the preheating step in the range of 190 to 200 ° C, And the temperature of the preheating member after the second preheating step is raised to 220 DEG C, A preheating step 4 in which the preheating is performed while maintaining the temperature of the preheating member passed through the preheating step 3 at 230 ° C. and maintained, A preheating step 5 in which preheating is performed while raising and maintaining the temperature of the preheating member to 240 캜 is carried out and the temperature of the mold member is maintained at a glass transition temperature of 50 to 60 캜, A second step of molding the mold member in which the temperature of the mold member is raised and maintained in the range of 70 to 80 DEG C and a second step of molding the mold member in which the temperature of the mold member is set to a temperature between the glass transition temperature and the melting point of 90 to 100 The temperature of the molding crystallization is maintained for 1 to 10 seconds, respectively, so that the molding crystallization temperature can be determined, Under the type crystallization temperature is held by the holding member temperature environment in the mold member characterized in that the molding step be made of the polylactic acid bottle.
According to the polylactic acid container manufacturing method, the polylactic acid container manufacturing apparatus, and the polylactic acid container manufacturing apparatus described above, which have improved heat resistance, a polylactic acid film supplying member, a preheating member, a main heating member, And a temperature holding member are used to produce a polylactic acid container so that the polylactic acid film drawn for the molding with the mold member can be crystallized together with the molding in the mold member, The polylactic acid container does not need to be subjected to a post-crystallization process after being molded in the mold member, so that the polylactic acid container can be improved in the production efficiency of the polylactic acid container while the crystallization process is performed to improve the heat resistance of the polylactic acid container There are advantages to be able to.
Description
The present invention relates to a polylactic acid container manufacturing method with improved heat resistance, a polylactic acid container manufactured by the manufacturing method, and an apparatus for producing the polylactic acid container.
Polylactic acid (PLA) is an eco-friendly resin made from raw materials extracted from corn starch. It is a safe material because it does not detect harmful substances such as environmental hormones and heavy metals even if it contains hot food or infants are bitten or sucked , While it has the same characteristics as ordinary plastics during use, it is a material that is 100% biodegraded by microorganisms at the time of disposal.
The above polylactic acid is a biodegradable raw material, but its price is not relatively high and it can be used for various applications.
It is a polylactic acid container which is molded with such a polylactic acid and contains food or the like, and the following patent documents can be presented as an example of such a polylactic acid container.
There is also a method of melting polylactic acid and using a hopper and a mold to dip the polylactic acid container. However, since this method requires a long time for the operation, the working efficiency is lowered. Therefore, in order to increase the production efficiency, A polylactic acid container is manufactured by molding a lactic acid film using a mold.
The problem that is frequently encountered when producing containers made of poly (lactic acid) film is that poly (lactic acid) has a relatively low heat deflection temperature, so that the poly (lactic acid) container is thermally deformed during the distribution and storage stages of the poly Or damaged.
In order to solve such a problem and to improve the heat resistance of the polylactic acid container, the polylactic acid film was put into a mold, the container was molded into a desired shape, and a step of crystallizing the molded polylactic acid container was performed separately.
However, according to the conventional method of producing a poly (lactic acid) container, the post-process of molding a poly (lactic acid) film into a desired shape through a die working process involves crystallizing the formed poly The polylactic acid container thus formed was moved to a heated chamber and put into a heated chamber, and after crystallization, it had to be taken out again and moved, thereby causing a problem that the production efficiency of the polylactic acid container was greatly reduced there was.
The present invention relates to a method for producing a polylactic acid container having improved heat resistance capable of improving the production efficiency of a polylactic acid container while performing a crystallization process for improving the heat resistance of the polylactic acid container, An object of the present invention is to provide a lactic acid container manufacturing apparatus.
An apparatus for producing polylactic acid containers according to one aspect of the present invention is for producing polylactic acid containers,
A polylactic acid film supply member supplying 1 to 5 parts by weight of an additive which is at least one of talc, filler, and calcium carbonate to 100 parts by weight of polylactic acid and supplies the polylactic acid film formed in the form of a film; A preheating member for preheating the polyphthalate film supplied by the polyphthalate film supplying member within a range of 150 to 250 占 폚; A main heating member for heating the preheated polyphtic acid film via the preheating member for molding; A mold member for molding the poly (ethylacetate) film heated through the main heating member into a desired container form of the poly (lactic acid) container; A temperature holding member for maintaining the temperature of the mold member at a required mold crystallization temperature; And a heat insulating sealing member for insulating the mold member from the outside so that cooling of the mold member heated and maintained by the temperature holding member can be prevented,
The temperature of the mold member is maintained at the mold crystallization temperature by the temperature holding member so that the polyphthalic acid film drawn for molding with the mold member is crystallized together with molding in the mold member,
Wherein the mold member comprises: a lower metal mold for forming a desired bottom surface shape of the polytrimic acid container; an upper metal mold for forming a desired top surface shape of the polylactic acid container; and at least one of the lower metal mold and the upper metal mold And an electrothermal material arranged in a plurality of shapes interpolated on the mold member for transferring heat applied by the temperature holding member for molding and crystallization of the entire mold member,
A plurality of the heat transfer elements are disposed in the mold member so as to be spaced apart from each other so that the surface temperature of the mold member can be uniformed, the heat transfer elements are disposed at the same depth from the surface of the mold member,
Wherein the temperature holding member circulates the circulating fluid to the heating body by heating the circulating fluid and the heating body circulates the circulating fluid circulated in the temperature holding member,
In the preheating member, a preheating step in which preheating is performed while maintaining the temperature of the preheating member in a range of 150 to 160 ° C, and a preheating step in which the temperature of the preheating member after the preheating step is raised to 190 to 200 ° C A preheating step 3 in which the preheating is performed while maintaining the temperature of the preheating member passed through the preheating step 2 up to 220 ° C and maintaining the temperature, A preheating step 4 in which the preheating is performed while the temperature of the preheating member is maintained at 230 ° C. and a preheating step 5 in which the preheating is performed while the temperature of the preheating member having passed through the preheating step 4 is maintained at 240 ° C., Lt; / RTI >
Wherein the temperature of the mold member is maintained at a glass transition temperature of 50 to 60 占 폚 of the poly (lactic acid) film; a first step of shaping crystallization in which the temperature of the mold member is elevated to 70 to 80 占 폚, And a mold crystallization third step in which the temperature of the mold member is raised and maintained in the range of 90 to 100 DEG C, which is a temperature between the glass transition temperature and the melting point of the poly (oxyalkylene) film, is maintained for 1 to 10 seconds, The crystallization temperature can be determined, and the molding process of the polylactic acid container is performed in the mold member under an environment in which the molding crystallization temperature is maintained by the temperature holding member.
According to the method for producing a polylactic acid container with improved heat resistance according to an aspect of the present invention, the polylactic acid container manufactured by the method and the apparatus for producing a polylactic acid container, the polylactic acid film supply member, the preheating member, A polylactic acid container is produced by using a polylactic acid container manufacturing apparatus including a mold member and a temperature holding member so that the polylactic acid film drawn for the molding with the mold member can be crystallized together with molding in the mold member So that the polylactic acid container is molded in the mold member and then subjected to a post-crystallization process in a separate device. Therefore, a crystallization process is performed to improve the heat resistance of the polylactic acid container, The manufacturing efficiency can be improved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a configuration of an apparatus for producing polylactic acid containers according to an embodiment of the present invention; FIG.
FIG. 2 is a view showing a poly (lactic acid) film drawn into a mold member constituting an apparatus for producing a poly (lactic acid) container according to an embodiment of the present invention for molding; FIG.
Fig. 3 is an enlarged view of part A shown in Fig. 2; Fig.
4 is a view showing a state in which a poly (lactic acid) film is molded by the mold member shown in Fig. 2; Fig.
4 is a view showing a state in which a polylactic acid container is molded by the mold member shown in Fig. 4; Fig.
6 is a view showing the present heating member constituting an apparatus for producing a polylactic acid container according to an embodiment of the present invention.
Hereinafter, a method for manufacturing a polylactic acid container with improved heat resistance according to an embodiment of the present invention, a polylactic acid container manufactured by the method, and the apparatus for producing a polylactic acid container will be described with reference to the drawings.
FIG. 1 is a schematic view showing the construction of a polylactic acid container manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a polylactic acid film forming apparatus according to an embodiment of the present invention, Fig. 3 is an enlarged view of part A shown in Fig. 2, Fig. 4 is a view showing a state where the poly (lactic acid) film is molded by the mold member shown in Fig. 2 FIG. 4 is a view showing a state in which the polylactic acid container is molded by the mold member shown in FIG. 4, and FIG. 6 is a view showing the present heating member constituting the apparatus for producing a polylactic acid container according to an embodiment of the present invention. FIG.
1 to 6 together show a polylactic acid
The polyphthalate
Here, the poly (ethylacid)
The preheating
In detail, the preheating
The
The
For example, as shown in FIG. 6, the
The
The
In detail, the
The mold moving means 121 may be represented by a hydraulic cylinder, and the
The
A plurality of the
When the
The
The temperature of the
The molding crystallization temperature for molding and simultaneous crystallization of the poly (lactic acid)
For example, in the first stage of the molding crystallization, the temperature of the
The
The
The
The heat insulating sealing
The heat insulating sealing
The heat
Hereinafter, a method of manufacturing the
First, a
In the step (a), the additive to be added to the poly (lactic acid) may be at least one of talc, filler and calcium carbonate, and 1 to 5 parts by weight of the additive may be added to 100 parts by weight of the poly (lactic acid) have.
The poly (ethylacetate)
Then, the step of preheating the poly (ethylacetate)
More specifically, the step (b) may include a preheating step of performing preheating while maintaining the temperature of the preheating
Then, the poly (ethylacetate)
Specifically, in the step (c), the temperature of the
Here, the first shaping crystallization step, the second shaping crystallization step, and the third shaping crystallization step may be performed for a range of 1 to 10 seconds, respectively.
The method of manufacturing the
At the outer periphery of the
Since the poly (lactic acid)
Meanwhile, the poly (lactic acid)
As described above, in the polylactic acid
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the following claims And can be changed. However, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
According to the method for producing a polylactic acid container with improved heat resistance according to one aspect of the present invention, the polylactic acid container manufactured by the method, and the apparatus for producing a polylactic acid container, a crystallization process is performed for improving the heat resistance of the polylactic acid container, The production efficiency of the poly (lactic acid) container can be improved, so that the possibility of industrial application is high.
100: polylactic acid container manufacturing device
101: Poly (lactic acid) film supply member
110:
130:
140: mold member
150: Temperature holding member
Claims (1)
A polylactic acid film supply member supplying 1 to 5 parts by weight of an additive which is at least one of talc, filler, and calcium carbonate to 100 parts by weight of polylactic acid and supplies the polylactic acid film formed in the form of a film;
A preheating member for preheating the polyphthalate film supplied by the polyphthalate film supplying member within a range of 150 to 250 占 폚;
A main heating member for heating the preheated polyphtic acid film via the preheating member for molding;
A mold member for molding the poly (ethylacetate) film heated through the main heating member into a desired container form of the poly (lactic acid) container;
A temperature holding member for maintaining the temperature of the mold member at a required mold crystallization temperature; And
And a heat insulating sealing member for insulating the mold member from the outside so as to prevent cooling of the mold member heated and maintained by the temperature holding member,
The temperature of the mold member is maintained at the mold crystallization temperature by the temperature holding member so that the polyphthalic acid film drawn for molding with the mold member is crystallized together with molding in the mold member,
Wherein the mold member comprises: a lower metal mold for forming a desired bottom surface shape of the polytrimic acid container; an upper metal mold for forming a desired top surface shape of the polylactic acid container; and at least one of the lower metal mold and the upper metal mold And an electrothermal material arranged in a plurality of shapes interpolated on the mold member for transferring heat applied by the temperature holding member for molding and crystallization of the entire mold member,
A plurality of the heat transfer elements are disposed in the mold member so as to be spaced apart from each other so that the surface temperature of the mold member can be uniformed, the heat transfer elements are disposed at the same depth from the surface of the mold member,
Wherein the temperature holding member circulates the circulating fluid to the heating body by heating the circulating fluid and the heating body circulates the circulating fluid circulated in the temperature holding member,
In the preheating member, a preheating step in which preheating is performed while maintaining the temperature of the preheating member in a range of 150 to 160 ° C, and a preheating step in which the temperature of the preheating member after the preheating step is raised to 190 to 200 ° C A preheating step 3 in which the preheating is performed while maintaining the temperature of the preheating member having passed through the preheating step 2 up to 220 ° C and maintaining the temperature of the preheating member; A preheating step 4 in which the preheating is performed while the temperature of the preheating member is maintained at 230 ° C. and a preheating step 5 in which the preheating is performed while the temperature of the preheating member having passed through the preheating step 4 is maintained at 240 ° C., Lt; / RTI >
Wherein the temperature of the mold member is maintained at a glass transition temperature of 50 to 60 占 폚 of the poly (lactic acid) film; a first step of shaping crystallization in which the temperature of the mold member is elevated to 70 to 80 占 폚, And a mold crystallization third step in which the temperature of the mold member is raised and maintained in the range of 90 to 100 DEG C, which is a temperature between the glass transition temperature and the melting point of the poly (oxyalkylene) film, is maintained for 1 to 10 seconds, The crystallization temperature can be determined and the molding process of the polylactic acid container is performed in the mold member under an environment in which the molding crystallization temperature is maintained by the temperature holding member.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020160040219A KR101642268B1 (en) | 2016-04-01 | 2016-04-01 | Manufacturing method of polylactic acid vessel having improved heat-resisting property, polylactic acid vessel manufactured by the manufacturing method, and manufacturing machine of the polylactic acid vessel |
PCT/KR2016/009636 WO2017171156A1 (en) | 2016-04-01 | 2016-08-30 | Method for manufacturing polylactic acid container having improved heat resistance, polylactic acid container manufactured by manufacturing method, and apparatus for manufacturing polylactic acid container |
Applications Claiming Priority (1)
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KR1020160040219A KR101642268B1 (en) | 2016-04-01 | 2016-04-01 | Manufacturing method of polylactic acid vessel having improved heat-resisting property, polylactic acid vessel manufactured by the manufacturing method, and manufacturing machine of the polylactic acid vessel |
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KR101642268B1 true KR101642268B1 (en) | 2016-07-26 |
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WO (1) | WO2017171156A1 (en) |
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CN114347518B (en) * | 2021-12-31 | 2023-06-02 | 漳州杰安塑料有限公司 | PLA straw crystallization process |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010047657A (en) * | 1999-11-22 | 2001-06-15 | 윤근수 | Pressure method of articles molding by pressure |
JP2007254522A (en) * | 2006-03-22 | 2007-10-04 | Cp Kasei Kk | Polylactic acid-based resin foamed sheet, and method for producing container made of the sheet |
KR20110045588A (en) | 2009-10-27 | 2011-05-04 | 도레이첨단소재 주식회사 | Polylactic sheet having excellent heat resistance and manufacturing method thereof |
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JP5367644B2 (en) * | 2010-06-09 | 2013-12-11 | 太美雄 大前 | Thermoplastic resin molding method and mold for thermoforming |
CN103384702B (en) * | 2011-02-24 | 2015-02-18 | 东丽株式会社 | Polylactic acid-based film |
KR101309687B1 (en) * | 2011-04-05 | 2013-09-17 | 트리 칸 코포레이션 리미티드 | Manufacturing method of plant fiber foam |
-
2016
- 2016-04-01 KR KR1020160040219A patent/KR101642268B1/en active IP Right Grant
- 2016-08-30 WO PCT/KR2016/009636 patent/WO2017171156A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010047657A (en) * | 1999-11-22 | 2001-06-15 | 윤근수 | Pressure method of articles molding by pressure |
JP2007254522A (en) * | 2006-03-22 | 2007-10-04 | Cp Kasei Kk | Polylactic acid-based resin foamed sheet, and method for producing container made of the sheet |
KR20110045588A (en) | 2009-10-27 | 2011-05-04 | 도레이첨단소재 주식회사 | Polylactic sheet having excellent heat resistance and manufacturing method thereof |
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