CN113500837A - Degradable barrier sheet, lunch box and preparation method thereof - Google Patents

Degradable barrier sheet, lunch box and preparation method thereof Download PDF

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Publication number
CN113500837A
CN113500837A CN202110917371.6A CN202110917371A CN113500837A CN 113500837 A CN113500837 A CN 113500837A CN 202110917371 A CN202110917371 A CN 202110917371A CN 113500837 A CN113500837 A CN 113500837A
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CN
China
Prior art keywords
sheet
lunch box
degradable
barrier
layer
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Pending
Application number
CN202110917371.6A
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Chinese (zh)
Inventor
周世革
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.)
Suzhou Fenglian Industrial Co ltd
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Suzhou Fenglian Industrial Co ltd
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Filing date
Publication date
Application filed by Suzhou Fenglian Industrial Co ltd filed Critical Suzhou Fenglian Industrial Co ltd
Priority to CN202110917371.6A priority Critical patent/CN113500837A/en
Publication of CN113500837A publication Critical patent/CN113500837A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
    • A45C11/20—Lunch or picnic boxes or the like
    • 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
    • B29C51/02—Combined thermoforming and manufacture of the preform
    • 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
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones

Abstract

The invention relates to a degradable separation sheet, a lunch box and a preparation method thereof, wherein the sheet comprises an upper surface layer, a middle core layer and a lower surface layer, the upper surface layer is formed by blending PBAT and PBS, the middle core layer is formed by blending PBAT and PGA, the lower surface layer is formed by blending PBAT and PLA, raw material resins are melted and extruded in a multi-layer co-extrusion sheet mode, the multi-layer co-extrusion sheet is obtained through a distributor with a flow guide column and a sheet die head, then the sheet is heated and softened in a non-contact way, and the product lunch box is formed by a male die and a female die of a plastic-sucking forming die through plastic sucking. The degradable material for the barrier lunch box adopted by the invention can play a role in keeping fresh, the whole material is degradable after use, when the degradable material is incinerated, the combustion heat value is the same as that of incinerated paper, the degradable material is half of that of incinerated traditional plastics (such as polyethylene), toxic gases such as nitride, sulfide and the like can not be released, and when the compost is degraded, the degradable material can be biodegraded within 180 days in an industrial compost environment.

Description

Degradable barrier sheet, lunch box and preparation method thereof
Technical Field
The invention belongs to the technical field of environment-friendly lunch boxes, and particularly relates to a degradable barrier sheet, a lunch box and a preparation method of the lunch box.
Background
The state of the art forms the most important four basic coatings of high barrier materials: nylon, PVDC, EVOH and sputtered metal films. However, the social progress makes the demands of consumers on barrier packaging higher, and the food is expected to be fresher and can keep the original taste and flavor and high quality of the product better, so that the material developers and researchers are prompted to seek more advanced packaging materials and development schemes.
Today, high performance barrier films or high barrier packaging are widely used in the food industry. Some scholars in the western world have analyzed that the use of high barrier packaging is more common in europe and japan than in the united states. In western europe and japan, consumers attach great importance to the quality of food and the consumption of food appears to be more socialized, while in north america, there seems to be more emphasis on personalization, that is, they prefer foods that change their taste quickly, are hotter and fresher.
Current disposable barrier packages are also substantially made of conventional plastics. Can not be degraded or recycled after being discarded, and causes harm to the environment.
In the aspect of high barrier materials, EVOH has the highest level of gas barrier capability among all plastic materials, is widely used in many fields such as food packaging and has leadership in food packaging and industrial barrier applications. However, although EVOH solves the problem of barrier properties in food packaging, it is not controversial to meet the increasing global demand for degradation of packaging materials.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the degradable barrier sheet, the lunch box and the preparation method thereof, and the disposable lunch box has the characteristic that the disposable package can be degraded in the environment.
In order to solve the technical problems, the barrier sheet with degradability comprises an upper surface layer, a middle core layer and a lower surface layer, wherein the upper surface layer is formed by blending a copolymer of butylene adipate and butylene terephthalate accounting for 40-60% of the mass and polybutylene succinate accounting for 40-60% of the mass, the upper surface layer is directly contacted with a food surface, the surface gloss and the flexibility are better, the mechanical property of the polybutylene succinate (PBS) is excellent, the heat resistance is good, the heat deformation temperature is close to 100 ℃, and the heat resistance is good; the middle core layer is formed by blending 60-80% by mass of a copolymer of butanediol adipate and butanediol terephthalate and 20-40% by mass of polyglycolic acid, the polyglycolic acid has good carbon dioxide and oxygen barrier properties, the middle core layer with good gas barrier properties can be obtained by mixing the two materials, the polyglycolic acid has the characteristic of rapid degradation, and the degradation speed can be effectively controlled by wrapping the middle core layer with the polyglycolic acid; the lower surface layer is formed by blending 30-50% by mass of a copolymer of butanediol adipate and butanediol terephthalate and 50-80% by mass of polylactic acid, the lower surface layer is the outermost layer of the lunch box, the overall strength of the product can be enhanced by the lower surface layer and the polylactic acid, and the polylactic acid has the best tensile strength and ductility.
The degradable blocking lunch box is made by plastic molding of the degradable blocking sheet and comprises a containing box, wherein the containing box consists of a bottom plate, a partition plate and side plates, the side plates surround the bottom plate to form grooves, the bottom end of the partition plate is connected with the bottom plate, and the side walls of the partition plate are connected with the side plates to form three groups of grooves.
Furthermore, the top end of the side plate extends outwards to be elongated, the thickness of the convex corners at the periphery of the extending and elongating part is half of the thickness of the extending and elongating part, namely, the four corners at the top end of the extending and elongating part are provided with depressions.
Furthermore, arc-shaped grooves are formed in the joints of the partition plates and the bottom plate.
The preparation method of the barrier lunch box with degradability comprises the following steps:
the method comprises the following steps: sheet stock preparation
Preparing materials for the upper surface layer, the middle core layer and the lower surface layer respectively,
step two: sheet preparation
Adopting a multi-layer co-extrusion sheet mode, using 2 or 3 single screw extruders or screw extruders, setting the temperature of the extruders to be 165-185 ℃, carrying out melt extrusion on each raw material resin, and obtaining the multi-layer co-extrusion sheet through a distributor with a guide column and a sheet die head, wherein the temperature of a die is set to be 180-195 ℃;
step three: softening of sheet material
After the sheet is extruded, the sheet is softened by non-contact heating for 6-10 seconds;
step four: plastic suction forming
The product lunch box is formed by the male die and the female die of the plastic-sucking forming die through plastic sucking.
Further, the softening and heating temperature of the sheet in the third step is as follows: the temperature of the upper heating zone is 250-270 ℃, and the temperature of the lower heating zone is 230-250 ℃.
Further, in the fourth step, the vacuumizing time of the mold is 1-3 seconds, the air compressing time is 1-3 seconds, and the exhausting time is 1 second.
Compared with the prior art, the invention has the beneficial effects that:
the degradable material for the blocking lunch box adopted by the invention can play a role of fresh keeping in use, and the whole material is degradable after use, when the degradable material is incinerated, the combustion heat value is the same as that of incinerated paper, and is half of that of incinerated traditional plastics (such as polyethylene), and the incinerated polylactic acid can not release toxic gases such as nitride, sulfide and the like absolutely, and can be biodegraded within 180 days in an industrial composting environment when the compost is degraded. An industrial composting environment means that the specified temperature is about 60 ℃ and that microorganisms must be present. By this definition, compostable plastics do not leave fragments in the residue that are present for longer than about 12 weeks, are free of heavy metals or toxic substances, and can sustain plant life.
Drawings
The following further explains embodiments of the present invention with reference to the drawings.
FIG. 1 is a schematic view of a barrier sheet with degradable properties of the present invention;
fig. 2 is a schematic structural view of the degradable barrier lunch box of the invention.
In the figure: 1. placing the box; 2. a base plate; 3. a partition plate; 4. a side plate;
PGA: polyglycolic acid; PBS: polybutylene succinate; PBAT: copolymers of butylene adipate and butylene terephthalate; PLA: polylactic acid
Detailed Description
With reference to fig. 1, the degradable barrier sheet material of the present invention comprises an upper surface layer, a middle core layer and a lower surface layer, wherein the upper surface layer is formed by blending a copolymer of butylene adipate and butylene terephthalate with a mass ratio of 40% to 60% and polybutylene succinate with a mass ratio of 40% to 60%, and the upper surface layer directly contacts with a food surface, so that the surface gloss and flexibility are good, the mechanical properties of the polybutylene succinate are excellent, the heat resistance is good, the thermal deformation temperature is close to 100 ℃, and the heat resistance is good; the middle core layer is formed by blending 60-80% by mass of a copolymer of butanediol adipate and butanediol terephthalate and 20-40% by mass of polyglycolic acid, the polyglycolic acid has good carbon dioxide and oxygen barrier properties, the middle core layer with good gas barrier properties can be obtained by mixing the two materials, the polyglycolic acid has the characteristic of rapid degradation, and the degradation speed can be effectively controlled by wrapping the middle core layer with the polyglycolic acid; the lower surface layer is formed by blending 30-50% by mass of a copolymer of butanediol adipate and butanediol terephthalate and 50-80% by mass of polylactic acid, the lower surface layer is the outermost layer of the lunch box, the overall strength of the product can be enhanced by the lower surface layer and the polylactic acid, and the polylactic acid has the best tensile strength and ductility.
Referring to fig. 2, the degradable blocking lunch box of the invention is made by plastic molding the degradable blocking sheet, and the containing box 1 is composed of a bottom plate 2, a partition plate 3 and a side plate 4, wherein the side plate 4 surrounds the bottom plate 2 to form a groove, the bottom end of the partition plate 3 is connected with the bottom plate 2, the side wall of the partition plate 3 is connected with the side plate 4 to form three groups of grooves, and multiple groups of foods can be stored in a separated manner.
In this embodiment, preferably, the top end of the side plate 4 extends and elongates outward, and the thickness of the convex corners at the periphery of the extending and elongating portion is half of the thickness of the extending and elongating portion, that is, the four corners at the top end of the extending and elongating portion are provided with recesses.
This embodiment is preferred, division board 3 all is equipped with the arc recess with bottom plate 2 junction, avoids the food card not convenient to take between division board 3 and bottom plate 2.
The preparation method of the barrier lunch box with degradability comprises the following steps:
the method comprises the following steps: sheet stock preparation
Preparing materials for the upper surface layer, the middle core layer and the lower surface layer respectively,
step two: sheet preparation
Adopting a multi-layer co-extrusion sheet mode, using 2 or 3 single screw extruders or screw extruders, setting the temperature of the extruders to be 165-185 ℃, carrying out melt extrusion on each raw material resin, and obtaining the multi-layer co-extrusion sheet through a distributor with a guide column and a sheet die head, wherein the temperature of a die is set to be 180-195 ℃;
step three: softening of sheet material
After the sheet is extruded, the sheet is softened by non-contact heating for 6-10 seconds;
step four: plastic suction forming
The product lunch box is formed by the male die and the female die of the plastic-sucking forming die through plastic sucking.
In this embodiment, the softening and heating temperatures of the sheet in the third step are preferably: the temperature of the upper heating zone is 250-270 ℃, and the temperature of the lower heating zone is 230-250 ℃.
Preferably, in the fourth step, the mold is vacuumized for 1-3 seconds, compressed air for 1-3 seconds, and exhausted for 1 second.
The degradable material for the blocking lunch box adopted by the invention can play a role of fresh keeping in use, and the whole material is degradable after use, when the degradable material is incinerated, the combustion heat value is the same as that of incinerated paper, and is half of that of incinerated traditional plastics (such as polyethylene), and the incinerated polylactic acid can not release toxic gases such as nitride, sulfide and the like absolutely, and can be biodegraded within 180 days in an industrial composting environment when the compost is degraded. An industrial composting environment means that the specified temperature is about 60 ℃ and that microorganisms must be present. By this definition, compostable plastics do not leave fragments in the residue that are present for longer than about 12 weeks, are free of heavy metals or toxic substances, and can sustain plant life.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the invention, which can be embodied in many different forms than described herein, and therefore the invention is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims (7)

1. A barrier sheet having degradable properties, characterized by: the high-strength high-toughness.
2. The utility model provides a separation cutlery box with degradable performance which characterized in that: the lunch box is made by plastic molding of the degradable barrier sheet material according to claim 1, and comprises a containing box, wherein the containing box is composed of a bottom plate, a partition plate and side plates, the side plates surround the bottom plate to form grooves, the bottom end of the partition plate is connected with the bottom plate, and the side walls of the partition plate are connected with the side plates to form three groups of grooves.
3. A barrier lunch box with degradability as claimed in claim 2, characterized in that: the top of curb plate extends to the outside and elongates, just the position is elongated in extension the protruding angle department thickness in the periphery of stretching is for extending and drags half of the position thickness, promptly the extension is elongated the top four corners of position and all is equipped with the cave.
4. A barrier lunch box with degradability as claimed in claim 2, characterized in that: and arc-shaped grooves are formed in the joints of the partition plates and the bottom plate.
5. A preparation method of a degradable obstructing lunch box is characterized in that: the method comprises the following steps:
the method comprises the following steps: sheet stock preparation
Preparing materials according to the upper surface layer, the central layer and the lower surface layer respectively,
step two: sheet preparation
Adopting a multi-layer co-extrusion sheet mode, using 2 or 3 single screw extruders or screw extruders, setting the temperature of the extruders to be 165-185 ℃, carrying out melt extrusion on each raw material resin, and obtaining the multi-layer co-extrusion sheet through a distributor with a guide column and a sheet die head, wherein the temperature of a die is set to be 180-195 ℃;
step three: softening of sheet material
After the sheet is extruded, the sheet is softened by non-contact heating for 6-10 seconds;
step four: plastic suction forming
The product lunch box is formed by the male die and the female die of the plastic-sucking forming die through plastic sucking.
6. A method of making a barrier lunch box with degradability as claimed in claim 5, characterized in that: the softening and heating temperature of the sheet in the third step is as follows: the temperature of the upper heating zone is 250-270 ℃, and the temperature of the lower heating zone is 230-250 ℃.
7. A method of making a barrier lunch box with degradability as claimed in claim 5, characterized in that: in the fourth step, the vacuumizing time of the mold is 1-3 seconds, the air compressing time is 1-3 seconds, and the exhausting time is 1 second.
CN202110917371.6A 2021-08-11 2021-08-11 Degradable barrier sheet, lunch box and preparation method thereof Pending CN113500837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110917371.6A CN113500837A (en) 2021-08-11 2021-08-11 Degradable barrier sheet, lunch box and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110917371.6A CN113500837A (en) 2021-08-11 2021-08-11 Degradable barrier sheet, lunch box and preparation method thereof

Publications (1)

Publication Number Publication Date
CN113500837A true CN113500837A (en) 2021-10-15

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FI20115745A0 (en) * 2011-07-12 2011-07-12 Stora Enso Oyj Heat-sealing biodegradable packaging material, a package or container made from it and the use of resin in extrusion coating
WO2014046320A1 (en) * 2012-09-21 2014-03-27 (주)엘지하우시스 Biodegradable sheet having adhesive layer
CN107031153A (en) * 2017-03-30 2017-08-11 齐庆德 A kind of biodegradable multi-layer co-extruded material and preparation method
CN209628872U (en) * 2018-05-12 2019-11-15 永嘉县宇恒生物技术研究院有限公司 The starch specialized lunch box for environment protection of high-speed rail
CN213030072U (en) * 2020-09-15 2021-04-23 浙江迪凡特环保科技有限公司 Novel lunch box
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FI20115745A0 (en) * 2011-07-12 2011-07-12 Stora Enso Oyj Heat-sealing biodegradable packaging material, a package or container made from it and the use of resin in extrusion coating
WO2014046320A1 (en) * 2012-09-21 2014-03-27 (주)엘지하우시스 Biodegradable sheet having adhesive layer
CN107031153A (en) * 2017-03-30 2017-08-11 齐庆德 A kind of biodegradable multi-layer co-extruded material and preparation method
CN209628872U (en) * 2018-05-12 2019-11-15 永嘉县宇恒生物技术研究院有限公司 The starch specialized lunch box for environment protection of high-speed rail
CN213030072U (en) * 2020-09-15 2021-04-23 浙江迪凡特环保科技有限公司 Novel lunch box
CN113085319A (en) * 2021-03-16 2021-07-09 晋江市新迪新材料科技有限公司 Full-biodegradable composite material for tableware and tableware using same

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