KR102545183B1 - Pla sheet composition having excellent transparency and heat resistance, and food tray product using thereof - Google Patents

Abstract

The present invention consists of a three-layer structure of an inner layer, a base layer, and a surface layer, and the base layer is based on PLA resin, and the composition of the inner layer and surface layer is based on PLA transparent heat-sealed double stretched film to enable biodegradation in nature. , A heat-resistant transparent sheet using a biodegradable resin whose structure is improved to maintain transparency for the identification of food to be packaged and improve heat resistance and impact resistance so as to prevent deformation of the food packaging container even when it accommodates high-temperature food, and It relates to a multi-layer heat-resistant transparent packaging container manufactured using the same.

Description

Heat resistant transparent sheet using biodegradable resin and multilayer heat resistant transparent packaging container manufactured using the same {PLA SHEET COMPOSITION HAVING EXCELLENT TRANSPARENCY AND HEAT RESISTANCE, AND FOOD TRAY PRODUCT USING THEREOF}

The present invention relates to a heat-resistant transparent sheet using a biodegradable resin and a multi-layer heat-resistant transparent packaging container manufactured using the same, and more particularly, to a three-layer structure of an inner layer, a base layer, and a surface layer, wherein the base layer is made of PLA resin as a base. The composition of the inner and surface layers is made of PLA transparent heat-sealed double stretched film as a base so that it can be biodegraded in nature. It relates to a heat-resistant transparent sheet using a biodegradable resin whose structure is improved to improve heat resistance and impact resistance so as to prevent deformation, and a multi-layer heat-resistant transparent packaging container manufactured using the same.

In general, food packaging containers are demanding high-performance, high-quality products due to the increase in consumer's national income and change in awareness of food hygiene. Depending on the diversification of cooked and processed foods and the characteristics of packaging objects such as fruit, fish, and meat, packaging methods and demand patterns of various foods are rapidly changing.

According to these changes in food packaging methods and demand patterns, food packaging containers go beyond the simple packaging concept for conventional foods and respond to the characteristics of packaging objects to supply fresh foods and food products by increasing the freshness retention period of foods. It is equipped with functions such as antibacterial, deodorizing, and antioxidant to reduce waste, secure heat resistance for instant processing and cooking and packaging of high-temperature food, and reduce environmental pollution caused by disposal of packaging containers, and various instant processed foods and high-temperature foods There is an urgent need to develop a food packaging container that secures heat resistance for food packaging and has eco-friendliness when discarding the packaging container.

Existing PLA is a polymer polymerized using monomers produced from natural products through a biological process as raw materials, and has recently emerged as a plant-derived biodegradable polymer that not only has excellent mechanical properties but also meets new environmental requirements.

PLA is applied not only to plastic products as an eco-friendly material but also to the medical field because it has the advantage of biocompatibility.

However, despite its many advantages, PLA has low crystallinity and low melt viscosity, so it is vulnerable to heat resistance and impact resistance as a packaging container for packaging high-temperature foods.

Conventional prior art related to the existing biodegradable polylactic acid sheet is disclosed in Korean Patent Registration No. 10-0675200 entitled "Biodegradable Composition Containing Starch and Manufacturing Method of Biodegradable Sheet Using the Same" (Registration Date: 2007.01.22) As described above, it relates to a biodegradable composition containing starch and a method for manufacturing a biodegradable sheet using the same. The biodegradable composition of the present invention includes (i) starch, a polymer derivative that is a combination of starch thermoplastic resin, and an aliphatic polyester as main components. 85 to 95.9% by weight and (ii) 4.1 to 15% by weight of auxiliary components consisting of plasticizers, fillers and auxiliary additives.

As prior art related to the existing biodegradable polylactic acid multilayer sheet with improved heat resistance, disclosed in Korean Patent Publication No. 10-2012-0039866 (published on April 26, 2012) "biodegradable multilayer sheet with excellent heat resistance" As described above, the outer layer (B, upper and lower layers) composed of 10 to 40 parts by weight of polylactic acid (PLA) having a D-isomer content of 3 mol% or less, and a D-isomer content of 8 mol% or Biodegradable polylactic acid multilayer sheet with excellent heat resistance, characterized in that the inner layer (A, middle layer) made of 60 to 90 parts by weight of polylactic acid (PLA) not exceeding this is composed of a layer of structure formed between the upper and lower outer layers (B) 』 is disclosed.

However, the inorganic mineral antibacterial composition in which the natural extract is introduced and the packaging material using the same is an antibacterial coating agent using a water-soluble binder including a urethane resin and an antibacterial composition in which a natural or synthetic mineral and a natural extract extracted from a plant are mixed. As it is manufactured and coated on a non-biodegradable substrate layer, it has only antibacterial properties and cannot have deodorization, antioxidation, and heat resistance when manufacturing food packaging containers, and the kimchi storage container having the acetic acid removal function is carbonic acid as a deodorant As it is manufactured by mixing sodium hydrogen and polyethylene (POLYETHYENE), it has a deodorizing function when manufacturing food packaging containers, but it cannot have antibacterial, antioxidant, and heat resistance. Since the constituting composition is a composition that is fired at a high temperature by heating to 1250 to 1285 ° C., it cannot be applied to food packaging containers manufactured at a low temperature, and the biodegradable polylactic acid multilayer sheet having excellent heat resistance has a high content of D-isomer. Differently, as the PET sheet having the upper, lower and middle layers is manufactured, it is difficult to manufacture the sheet and cannot have antibacterial, deodorizing and antioxidant properties. Accordingly, when a food packaging container is manufactured using the above prior art There is a problem that the freshness enhancing effect of food is significantly reduced.

Korean Patent Registration No. 10-0675200 "Biodegradable Composition Containing Starch and Manufacturing Method of Biodegradable Sheet Using the Same" (registration date: 2007.01.22) Korean Patent Publication No. 10-2012-0039866 "Biodegradable multi-layer sheet with excellent heat resistance" (published on April 26, 2012)

The present invention was created to solve these problems in view of the above problems, and the purpose thereof is composed of a three-layer structure of an inner layer, a base layer, and a surface layer, and the base layer is based on PLA resin, and the composition of the inner layer and the surface layer is PLA. Based on transparent heat-sealed double-stretched film, it is biodegradable in nature, can maintain transparency for identification of food to be packaged, and has heat resistance and impact resistance to prevent deformation of food packaging containers even when high-temperature food is accommodated. It is an object of the present invention to provide a heat-resistant transparent sheet using a biodegradable resin having an improved structure and a multi-layer heat-resistant transparent packaging container manufactured using the same.

The present invention for achieving the above object is a base layer composed of PLA resin; It is integrally laminated on top of the base layer, composed of a PLA resin transparent thermally bonded biaxially stretched film, and the adhesive surface facing the top of the base layer is integrally bonded by a thermal bonding method at a temperature of 80 to 120 ° C. surface layer; And it is integrally laminated on the lower part of the base layer, and is composed of a PLA resin transparent thermally bonded biaxially stretched film, and the adhesive surface facing the lower part of the base layer is integrally bonded by a thermal bonding method at a temperature of 80 to 120 ° C. Including, the base layer is made of 91.38 to 92.92% by weight with respect to the total weight of the sheet, and each of the surface layer and the inner layer is made of 3.4 to 4.4% by weight with respect to the total weight of the sheet, and the base layer of The thickness is made of 0.80 to 0.95mm, and the thickness of each of the surface layer and the inner layer is characterized in that it is made of a sheet composed of 0.036 to 0.044mm.

The temperature of the contact surface for thermal bonding of the base layer and the surface layer is 90°C.

The temperature of the contact surface for thermal bonding of the base layer and the inner layer is 90°C.

The thickness of the base layer is 0.8 ~ 0.85mm.

Each of the surface layer and the inner layer has a thickness of 0.039 to 0.041 mm.

The base layer is formed by heating and extruding 100% by weight of PLA resin.

The multi-layer heat-resistant transparent packaging container, which is another characteristic element of the present invention, is characterized in that it is made of a three-layer packaging container of a base layer, a surface layer, and an inner layer using the above sheet.

The packaging container is molded into a packaging container using a vacuum or pressure vacuum method using a molding machine mold in the process of heating and extruding a sheet, and further performing a room temperature aging process after molding.

The sheet and packaging container of the present invention are configured to have a multi-layered structure of three layers by thermally bonding PLA transparent thermally bonded biaxially stretched films to the upper and lower sides of the base layer made of PLA resin, thereby maintaining the high transparency of the PLA resin. It can identify the packaging product from the outside, doubles the aesthetic value of the product, can satisfy the biodegradability of PLA resin, and is composed of transparent heat-sealed biaxially oriented film, which is PLA resin, so that the surface layer and inner layer are heat-resistant compared to the base layer. and improved impact resistance to minimize thermal deformation even when receiving high-temperature food while satisfying sufficient strength, and the surface layer and the inner layer form the surface of the sheet to increase functionality such as anti-fogging properties.

1 is a view showing a heat-resistant transparent sheet using the biodegradable resin of the present invention.
Figure 2 is a view showing a multi-layer heat-resistant transparent packaging container made of a heat-resistant transparent sheet using the present invention biodegradable resin.

The present invention relates to a heat-resistant transparent sheet using a biodegradable resin and a multi-layer heat-resistant transparent packaging container manufactured using the same to increase the freshness retention period of the food to be packaged and to prevent deformation of the multi-layer food packaging container even when high-temperature food is accommodated. will be.

Hereinafter, a heat-resistant transparent sheet using a biodegradable resin according to the present invention and a multi-layer heat-resistant transparent packaging container manufactured using the same will be described in detail through detailed descriptions of embodiments with reference to the drawings.

In describing the present invention, if it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, and may vary according to a user's intention or custom. Therefore, the definition should be made based on the contents throughout this specification. In addition, 'including' a certain component means that other components may be further included, rather than excluding other components unless otherwise stated.

As shown in FIG. 1, the heat-resistant transparent sheet using a biodegradable resin according to the present invention includes a base layer 110 made of PLA resin; It is integrally laminated on top of the base layer 110, and is composed of a PLA resin transparent heat-sealed biaxially stretched film, and the adhesive surface facing the upper part of the base layer 110 is heat-sealed at a temperature of 80 to 120 ° C. A surface layer 120 integrally formed with adhesive; And integrally laminated on the lower part of the base layer 110, composed of a PLA resin transparent heat-sealed biaxially stretched film, and the adhesive surface facing the lower part of the base layer 110 is heat-sealed at a temperature of 80 to 120 ° C. Including, the base layer 110 is made of 91.38 to 92.92% by weight with respect to the total weight of the sheet 100, the surface layer 120 and the inner layer 130 Each of is made of 3.4 to 4.4% by weight relative to the total weight of the sheet 100, the thickness of the base layer 110 (t ₁ ) is made of 0.80 to 0.95mm, the surface layer 120 and the inner layer 130 ) Each thickness (t _2, t ₃ ) is characterized in that it is made of a sheet 100 composed of 0.036 to 0.044 mm.

The base layer 110 is formed by heating and extruding 100% by weight of polylactic acid (PLA) resin.

The base layer 110 is a polymer produced from plants and has excellent properties in thermoforming, coating, injection molding, and blow molding. For example, it is a PLA 4032D product manufactured by Naturework, USA, which is 100% polylactic acid (PLA), a biodegradable resin. can be adopted.

The base layer 110 is made of 91.38 to 92.92% by weight with respect to the total weight of the sheet 100, the surface layer 120 is made of 3.4 to 4.4% by weight with respect to the total weight of the sheet 100, and the inner layer ( 130) is composed of 3.4 to 4.4% by weight based on the total weight of the sheet 100.

More specifically, the base layer 110 is made of 91.85 to 92.50% by weight based on the total weight of the sheet 100, the surface layer 120 is made of 3.8 to 4.2% by weight based on the total weight of the sheet 100, , The inner layer 130 is composed of 3.8 to 4.2% by weight based on the total weight of the sheet 100.

The surface layer 120 and the inner layer 130 are integrally bonded to the upper and lower sides of the base layer 110 after heating the PLA transparent thermally bonded biaxially stretched film.

The PLA transparent thermally bonded biaxially stretched film maintains biodegradability, has similar vertical and horizontal strength compared to the uniaxial stretching method, has stronger mechanical strength, and has good printing, antifogging, and processability, so it is used as a base film. .

For example, the transparent heat-sealed biaxially oriented film is 100% PLA resin, and a TE90C product of the manufacturer skc may be adopted.

The thermal bonding temperature of the transparent heat-sealed biaxially oriented film is 80 to 80 to the adhesive surface (the upper surface of the surface layer 120 and the base layer 110, the lower surface of the base layer 110 and the surface of the inner layer 130 facing each other). It can be thermally bonded in the temperature range of 120℃.

The base layer 110 has a thickness of 0.80 to 0.95 mm, the surface layer 120 has a thickness of 0.036 to 0.044 mm, and the inner layer 130 has a thickness of 0.036 to 0.044 mm.

The specific thickness of the base layer 110 is 0.8 ~ 0.85mm, the thickness of the surface layer 120 is 0.039 ~ 0.041mm, the thickness of the inner layer 130 is 0.039 ~ 0.041mm.

In addition, for the reason of limiting the upper and lower limits of the weight and thickness of the base layer 110, surface layer 120, and inner layer 130 constituting the sheet 100, the base layer 110 is 92.92% by weight When formed to exceed the thickness (t ₁ ) of more than or 0.95 mm and the weight of the surface layer 120 and the inner layer 130 is less than 3.4% by weight or thinner than the thickness (t ₂ , t ₃ ) of 0.036 mm, respectively. , Functionality including biodegradability is enhanced, but when it is out of the above weight range and thickness range, the surface layer 120 and the inner layer 130 have reinforced heat resistance, impact resistance, and antifogging compared to the base layer 110 This is because it is difficult to secure the strength of the multi-layered food packaging container 200 due to a decrease in the functionality of the food packaging container 200, and deformation problems may occur during cooking of the filled food using an electric heating cabinet and an oven.

In addition, for the reason of limiting the upper and lower limits of the weight and thickness of the base layer 110, surface layer 120, and inner layer 130 constituting the sheet 100, the base layer 110 is 91.38% by weight A weight of less than 0.80 mm or a thickness of less than 0.80 mm (t ₁ ) and the surface layer 120 and the inner layer 130 each exceeding 4.4% by weight or a thickness of 0.044 mm (t _2, t ₃ ) To exceed When formed, the functions such as heat resistance and impact resistance of the surface layer 120 and the inner layer 130 are increased compared to the base layer 110, while the functionality including biodegradability is reduced, so that the food packaging container 200 This is because a problem in which the biodegradation effect is significantly reduced may occur.

The surface layer 120 is bonded to the upper side of the base layer 110 by thermal bonding, and the inner layer 130 is bonded to the lower side of the base layer 110 by thermal bonding. After heating to have a temperature of 120 ℃, it is thermally bonded.

Next, an embodiment of a multi-layer heat-resistant transparent packaging container manufactured by using a heat-resistant transparent sheet 100 using a biodegradable resin will be described.

[Example]

Examples of the present invention; Specimens for a heat-resistant transparent sheet 100 using a biodegradable resin and a multi-layer heat-resistant transparent packaging container were prepared. To form the base layer 110, which is the intermediate core layer, 912 g of PLA 4032D product made by Naturework, USA, which is 100% polylactic acid (PLA), a biodegradable resin, was prepared, and the PLA to form the surface layer 120 and the inner layer 130. After preparing 44 g of each of TE90C manufactured by skc, which is a transparent heat-sealed biaxially stretched film, the upper surface of the plate-shaped base layer 110 and the lower surface of the surface layer 120 are thermally bonded to each other. Heat the contact surface to have a temperature of 90 ° C. And, after heating the contact surface to have a temperature of 90 ° C. so that the lower surface of the base layer 110 and the upper surface of the inner layer 130 are thermally bonded to each other, specimens 1, 2, 3, and 4 in which the contact surfaces are bonded to each other with a pressing force manufactured.

Comparative examples and evaluation tables evaluating the moldability of the specimens 1, 2, 3, and 4 are shown in Table 1 below.

Comparative Example 1 is a specimen formed of a mixture of HI835S and PLA2003D, Comparative Example 2 is a specimen formed of a mixture of IF850 and PLA2003D, Comparative Example 3 is a specimen formed of a mixture of IH835M and PLA2003D, Comparative Example 4 is a specimen formed of a mixture of PBAT and PLA2003D, and Comparative Example 5 is a specimen formed of a mixture of PBS and PLA2003D.

Inspection conditions: A plurality of evaluators (30 people) measure the moldability of each material under the same conditions for the specimens of the examples and comparative examples, measure the moldability of each factor of the target specimen (dimensional inspection, function inspection) and measure the moldability by recipe,

The shape adaptation line test for each molding condition (clip adaptation state, cutting state, surface whitening, burr formation state) and molding application test (sheet deflection after heat treatment by temperature, formability, product formability) were performed.

division evaluation note A B C Sum Example (TE90C) 27 2 0 29 A+ Comparative Example 1 18 6 One 25 A Comparative Example 2 18 6 One 25 A Comparative Example 3 9 12 One 22 A- Comparative Example 4 15 8 One 24 A Comparative Example 5 6 4 4 14 B-

Evaluation Criteria: A: Excellent (21-30 points), B: Normal (11-20 points), C: Poor (1-10 points)

*Table 2 below shows the detailed evaluation of the specimens prepared according to the examples of the present invention.

division test evaluation status review item The details A B C 1. Material thickness 0.9T 3 - - uniform thickness weight g 3 - - weight uniformity 2. Formability Clip status - 3 - -- Good cracking Thomson - 3 - - good cut surface gloss inside 3 - - Excellent surface gloss outside 3 - - Excellent surface gloss cutting surface cracking phenomenon 3 - - good cut burr 3 - - burr 3. Heat resistance (A: 100~110℃) (B: 70~80℃), (C: 50~60℃) - 2 - heat resistance normal 4. Transparency Visual inspection (whitening phenomenon) 3 - - good transparency result 27 2 0 A

The test results of the hot water filling test for specimens 1, 2, 3, and 4 prepared according to the above embodiment of the present invention are shown in Table 3 below.

Psalm 1 Psalm 2 Psalm 3 Psalm 4 evaluation ℃ A B C A B C A B C A B C A B C total 35℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 40℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 45℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 50℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 55℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 60℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 65℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 70℃ - 2 - - 2 - - 2 - - 2 - - 8 - 8 75℃ - - One - - One - - One - - One - - 4 4 80℃ - - One - - One - - One - - One - - 4 4

division evaluation Evaluation (based on thermal fuse TF 55°C) A B C Sum embodiment 12 - - 12 A+ Comparison example 1 12 - - 12 A+ Comparative Example 2 6 2 One 9 A- Comparison Example 3 12 - - 12 A+ Comparison Example 4 12 - - 12 A+ Comparison Example 5 12 - - 12 A+

Evaluation - A: Excellent (9 to 12 points), B: Fair (5 to 8 points), C: Poor (1 to 4 points) As shown in Tables 3 and 4, corresponding to the embodiment of the present invention under the same conditions Compared to the Comparative Examples, specimens 1, 2, 3, and 4 do not undergo deformation while being directly filled with hot water at a temperature of 65 ° C or less, and even when hot water at 70 to 75 ° C is directly filled and contacted, the specimen is not deformed. It can be seen that this is relatively weak and the heat resistance is improved.

Table 5 below is a specific evaluation table for the oven aging (aging test) test of specimens prepared in Examples of the present invention, and Table 6 shows a table of aging test test results of the samples of the above-described Examples and Comparative Examples of the present invention.

-Oven performance (1.5m/min)

Psalm 1 Psalm 2 Psalm 3 Psalm 4 evaluation ℃ A B C A B C A B C A B C A B C total 35℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 40℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 45℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 50℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 55℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 60℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 65℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 70℃ 3 - - 3 - - 3 - - 3 - - 12 - - 12 75℃ - 2 - - 2 - - 2 - - 2 - - 8 One 9 80℃ - - One - - One - - One - - One - - 4 4

division evaluation Evaluation (based on heat distortion HDT 64℃) A B C Sum embodiment 12 - - 12 A+ Comparison example 1 - - 4 4 C Comparative Example 2 - - 4 4 C Comparison Example 3 - - 4 4 C Comparison Example 4 - - 4 4 C Comparison Example 5 - - 4 4 C

As shown in Tables 5 and 6 above, the transparent heat-sealed biaxially stretched film on the upper and lower sides of the base layer 110 compared to the comparative examples when the embodiment of the present invention is compared on the basis of the oven aging test heat distortion 64 ° C. It can be seen that it has sufficient durability against aging as it can meet sufficient strength and heat resistance by bonding. As shown in FIG. 2, it has a container shape having a receiving part so that the packaged product is contained therein, and is molded into a three-layer structure of a surface layer 120, a base layer 110, and an inner layer 130.

The surface layer 120 becomes the outer surface layer of the packaging container 200, and the inner layer 130 forms the inner surface of the packaging container 200 to which the packaging product comes into contact.

In the packaging container 200, the surface layer 120, which is the PLA transparent thermally bonded biaxially stretched film, is thermally bonded to the upper side of the base layer 110, and the PLA transparent thermally bonded biaxially stretched film is placed on the lower side of the base layer 110. The inner layer 130, which is a film, has a structure in which it is thermally bonded.

The heat bonding temperature is heat in the temperature range of 80 to 120 ° C. for the adhesive surface (the upper surface of the surface layer 120 and the base layer 110, the lower surface of the base layer 110 and the surface facing each other of the inner layer 130). can be glued.

That is, the multi-layer heat-resistant transparent packaging container 200, which is another characteristic element of the present invention, is a three-layer packaging container of a base layer 110, a surface layer 120, and an inner layer 130 using the sheet 100 above. In the process of heating and extruding the sheet 100, the packaging container 200 is molded into the packaging container 200 in a vacuum or pressure vacuum method using a molding machine mold (not shown), and aged at room temperature after molding. more process will be performed.

The base layer 110 has a thickness of 0.80 to 0.95 mm, the surface layer 120 has a thickness of 0.036 to 0.044 mm, and the inner layer 130 has a thickness of 0.036 to 0.044 mm.

More preferably, the base layer 110 has a thickness of 0.8 to 0.85 mm, the surface layer 120 has a thickness of 0.039 to 0.041 mm, and the inner layer 130 has a thickness of 0.039 to 0.041 mm.

It has the advantage of being able to meet heat resistance and impact resistance compared to existing packaging containers composed of only PLA resin by thermally bonding transparent heat-sealed biaxially stretched films stretched in both directions in the horizontal and vertical directions on the upper and lower sides of the base layer 110. .

Therefore, the sheet 100 and the packaging container 200 of the present invention have a three-layer multilayer structure by thermally bonding PLA transparent heat-sealed biaxially stretched films to the upper and lower sides of the base layer 110 made of PLA resin, respectively. By configuring, it is possible to maintain the high transparency of the PLA resin so that the packaged product can be identified from the outside, the aesthetic value of the product is doubled, the biodegradability of the PLA resin can be satisfied, and the surface layer 120 and the inner layer 130 are formed. It is composed of a transparent heat-sealed biaxially stretched film of PLA resin, which has improved heat resistance and impact resistance compared to the base layer 110, and can minimize thermal deformation even when receiving high-temperature food while meeting sufficient strength. The inner layer 130 forms the surface of the sheet 100 and has an advantage of increasing functionality such as anti-fogging properties.

As described above, the present invention has been described based on preferred embodiments, but these embodiments are intended to illustrate rather than limit the present invention. Various changes or alterations or adjustments to the examples will be possible. Therefore, the protection scope of the present invention should be construed as including all examples of changes, changes, or adjustments belonging to the gist of the technical idea of the present invention.

100: sheet 110: base layer
120: surface layer 130: inner layer
200: (multilayer transparent heat resistant) packaging container

Claims (8)

a base layer 110 made of PLA resin;
It is integrally laminated on top of the base layer 110, and is composed of a PLA resin transparent heat-sealed biaxially stretched film, and the adhesive surface facing the upper part of the base layer 110 is heat-sealed at a temperature of 80 to 120 ° C. A surface layer 120 integrally formed with adhesive; and
It is integrally laminated on the lower part of the base layer 110, and is composed of a PLA resin transparent heat-sealed biaxially stretched film, and the adhesive surface facing the lower part of the base layer 110 is heat-sealed at a temperature of 80 to 120 ° C. Including; inner layer 130 integrally bonded to
The base layer 110 is composed of 91.38 to 92.92% by weight based on the total weight of the sheet 100, and each of the surface layer 120 and the inner layer 130 is 3.4 to 4.4% by weight based on the total weight of the sheet 100. is made up of
The thickness (t ₁ ) of the base layer 110 is made of 0.80 to 0.95 mm, and the thicknesses (t _2, t ₃ ) of each of the surface layer 120 and the inner layer 130 are 0.036 to 0.044 mm Sheet ( 100) heat-resistant transparent sheet using a biodegradable resin, characterized in that produced. The method of claim 1,
Heat-resistant transparent sheet using a biodegradable resin, characterized in that the temperature of the contact surface for thermal bonding of the base layer 110 and the surface layer 120 is 90 ℃. The method of claim 1,
Heat-resistant transparent sheet using a biodegradable resin, characterized in that the temperature of the contact surface for thermal bonding of the base layer 110 and the inner layer 130 is 90 ℃. The method of claim 1,
The thickness (t ₁ ) of the base layer 110 is a heat-resistant transparent sheet using a biodegradable resin, characterized in that 0.8 ~ 0.85mm. The method of claim 1,
The thickness of each of the surface layer 120 and the inner layer 130 (t _2, t ₃ ) is a heat-resistant transparent sheet using a biodegradable resin, characterized in that 0.039 ~ 0.041mm. The method of claim 1,
The base layer 110 is a heat-resistant transparent sheet using a biodegradable resin, characterized in that formed by heating and extruding 100% by weight of PLA resin. A multi-layered packaging container 200 characterized in that it is made of a three-layered packaging container 200 of a base layer 110, a surface layer 120, and an inner layer 130 using the sheet 100 of any one of claims 1 to 6 Heat-resistant transparent packaging container. The method of claim 7,
The packaging container 200 is formed into a packaging container in a vacuum or pressure vacuum method using a molding machine mold in the process of heating and extruding the sheet 100, and a multi-layered, characterized in that further performing a room temperature aging process after molding Heat-resistant transparent packaging container.

Images