WO2003045692A1

WO2003045692A1 - Biodegradable laminated resin sheet and article formed therefrom

Info

Publication number: WO2003045692A1
Application number: PCT/JP2002/012155
Authority: WO
Inventors: Hidehiko Inaba; Kyosuke Kageyama; Kozo Fukuoka; Masakatsu Shiromo
Original assignee: Dynic Corporation
Priority date: 2001-11-27
Filing date: 2002-11-21
Publication date: 2003-06-05
Also published as: AU2002349697A1; JP2004358658A; TW200303264A

Abstract

A biodegradable laminated resin sheet (1) which is composed of a resin base fabric (2) for reinforcement and laminated resin materials (3a, 3b) laminated on both surfaces of the resin base fabric (2), characterized in that the resin base fabric and the laminated resin materials comprises a biodegradable plastic. The biodegradable laminated resin sheet is biodegradable as a whole, exhibits excellent strength at break and exfoliation strength, and also is excellent in high frequency welder processability in binding a plurality of the sheets and excellent in 180˚ peel strength and shear peel strength after such processing.

Description

Biodegradable laminated resin sheet and its molded articles Industrial application fields

TECHNICAL FIELD The present invention relates to a biodegradable laminated resin sheet, and a molded article of a biodegradable laminated resin sheet formed from the biodegradable laminated resin sheet. Background art

Generally, a laminated resin sheet is formed by laminating a resin layer on both sides of a base fabric, and is a laminate having excellent water resistance, abrasion resistance, cutting properties, and welding properties, and is industrially manufactured as turbolin or a polylaminated sheet. It is widely used in various fields such as applications and daily necessities. For example, in the industrial field etc., flexible containers and flexible packaging materials for logistics applications, civil engineering sheets in the civil engineering and construction fields, unstacked sheets, curing sheets, leisure seats in the daily sundries field, special aprons, various packaging materials, It is also used for large banners and flags, which are used as indoor and outdoor media.

This laminated resin sheet is formed by laminating resin layers on both sides of a base fabric. The base fabric of the laminated resin sheet is used for the purpose of strengthening the entire laminated resin sheet.

Conventionally, the base fabric of the laminated resin sheet is made of natural fibers such as cotton and hemp, and filament yarns of synthetic fibers such as polyester fibers, polyamide fibers, polyolefin fibers, and polyataryl fibers or split yarns of polyolefins such as polyethylene and polypropylene. It is used as a woven or knitted fabric by using flat yarn alone or as a mixture, or as a nonwoven fabric formed from natural fibers, synthetic resin fibers such as polyester and polyolefin.

Then, a thermoplastic resin such as a soft polychlorinated vinyl resin, a polyolefin resin, or a polyurethane resin is coated or melted on both surfaces of such a base fabric, and laminated as a resin layer using various laminating devices to form an integral molding. By doing so, a laminated resin sheet is manufactured. However, at present, such conventional laminated resin sheets are incinerated or landfilled as plastic waste when disposed after use. Incineration and landfilling as plastic waste in this way is becoming an important environmental issue in recent years, as it is desired to construct articles that are compatible with a natural recycling society.

In particular, in addition to physical properties, flexible polychlorinated vinyl is widely used for flexible containers and flexible packaging materials for the manufacturing and logistics industries, civil engineering sheets for civil engineering construction, and open-air sheets due to their workability and suitability for use. There are problems such as dioxins at the time and endocrine disrupting substances at the time of landfill. For this reason, it has recently been replaced by non-salt-dye bur resin such as polyolefin, but it has weaknesses in physical properties and workability and is still generally incinerated.

From this point of view, expectations for biodegradable plastics are increasing. This biodegradable plastic is decomposed into water and carbon dioxide by microorganisms when left in the soil for a certain period of time or fermented by a composter (composting device), so that endocrine disrupters such as dioxins are used. Various configurations have been proposed as materials for solving the problem of occurrence of cracks.

As an example of using such a biodegradable plastic, for example, Japanese Patent Application Laid-Open No. 2000-129496 discloses a sandbag formed by weaving a biodegradable flat yarn on a woven fabric. Has been described. The decomposition rate of this sandbag varies depending on the environmental temperature and location, but is usually divided in two to three years.

However, conventional sandbags have the tensile strength of sandbags and are biodegradable, so they are considered to be useful from a functional and environmental point of view. Of course, it is not suitable for the use of the above-mentioned tarpaulin-polylaminate sheet.

In general, when used as a material that substitutes for polychlorinated rubber, for example, a laminated resin sheet made of polyolefin has a high bonding strength when performing a bonding process, and a high frequency that can easily perform the bonding work. It was not suitable for heat welding such as welding. ·

Even when using biodegradable plastic materials, there is a problem of leakage of water and stitch strength during sewing. There was a need for a configuration that could do this.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a biodegradable laminated resin sheet in which the entire laminated resin sheet is biodegradable and a biodegradable laminated resin sheet molded article. To provide. Another object of the present invention is that the laminated sheet is excellent in breaking strength and peeling strength, and high-frequency welder between laminates, biodegradability with excellent 180 degree peeling strength after processing, and excellent shearing peeling strength It is an object of the present invention to provide a laminated resin sheet and a biodegradable laminated resin sheet molded article. Disclosure of the invention

The biodegradable laminated resin sheet according to the present invention has the following configuration. That is, it is composed of a resin base cloth for reinforcement and a resin laminate laminated on both sides of the resin base cloth, and the resin base cloth and the resin laminate are composed of biodegradable plastic. This was a biodegradable laminated resin sheet.

With this configuration, since the entire laminated resin sheet is biodegradable, the entire laminated resin sheet exhibits biodegradability. It is convenient to form the resin base fabric and the resin laminate by welding.

Further, in the biodegradable laminated resin sheet, the resin base fabric is a biodegradable woven fabric, a biodegradable knitted fabric, or a biodegradable nonwoven fabric (for example, a spunbonded biodegradable nonwoven fabric). Was adopted.

With this configuration, the biodegradable laminated resin sheet is made of a resin base cloth.

(1) It has sufficient biodegradability and at the same time has sufficient strength, and the biodegradable laminated resin sheet of the present invention can be formed by a conventionally known laminating apparatus.

Further, in the biodegradable laminated resin sheet, the resin base fabric and the resin laminate are made of a biodegradable plastic that is chemically compatible at a lamination temperature.

With this configuration, the compatibility between the predetermined plastic component in the resin base fabric and the predetermined component in the resin to be laminated is good. When fabric and resin laminate are integrally molded, each layer is mixed Integrally, sufficient peel strength can be obtained without delamination. In addition, in the biodegradable laminated resin sheet, the resin base fabric has an opening enough for resin laminates laminated from both sides at a lamination temperature to be in close contact with each other. The resin laminates laminated on both sides of the cloth were composed of biodegradable plastic raw materials that are chemically compatible at the lamination temperature.

With this configuration, even if the resin base fabric and the resin laminate cannot be sufficiently adhered to each other, a sufficient peel strength can be obtained as a whole of the laminate.

In addition, this configuration broadens the selection of the base fabric and the resin laminate. In this case, the resin laminates may be composed of raw materials of the same composition of the resin thread, or may be added with a part of each resin raw material that shows compatibility. May be.

In addition, a biodegradable laminated resin sheet molded article formed from the biodegradable laminated resin sheet may be used, or the biodegradable laminated resin sheet may be formed using a high-frequency heater. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view schematically showing a biodegradable laminated resin sheet according to the present invention.

FIGS. 2 (a) and 2 (b) are perspective views of a configuration of the biodegradable laminated resin sheet according to the present invention, which is a partially broken perspective view schematically showing a bonding state between a resin base fabric and a resin laminate. It is a sectional view

FIG. 3 is a table showing a list of biodegradable plastics according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

The terms used in the present invention are as defined below.

The term "biodegradable plastic" as used in the present invention can be used in the same way as ordinary plastic during use, regardless of its original meaning, and is used in nature after use. It is a plastic that can be converted into low molecular compounds by microorganisms and eventually decomposed into water and carbon dioxide. The “biodegradable plastic” in the present invention is not particularly limited as long as it can be molded into a resin base fabric and a resin laminate constituting the laminated resin sheet of the present invention. Biodegradable plastics such as biodegradable plastics, microbial biodegradable plastics such as polyhydroxybutyrate, and natural biodegradable plastics such as starch Z chemically synthesized green bra. .

In addition, the term “compatible plastic raw material” used in the present invention refers to a plastic raw material that has a similar chemical structure as a plastic raw material and becomes completely integrated when laminated. To tell. For example, when the resin base fabric is composed of a predetermined resin component A alone or is a blend of a plastic component containing the A component, the plastic raw material forming the resin laminate is composed of the resin component A alone. Or a blend of plastic components, including the A component.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

Fig. 1 is a cross-sectional view schematically showing a biodegradable laminated resin sheet, and Figs. 2 (a) and (b) show the structure of a biodegradable laminated resin sheet joined to a resin base fabric and a resin laminate. It is the perspective view and sectional drawing which fractured | ruptured the part which showed the state typically.

As shown in FIG. 1, a biodegradable laminated resin sheet 1 is composed of a reinforcing resin base fabric 2 formed from biodegradable plastic force, and a biodegradable plastic on both sides of the resin base fabric 2. The resin laminates 3a and 3b are formed and laminated. In FIG. 1, the resin base fabric 2 and the resin laminates 3a and 3b are shown as having the same thickness, but the thickness is arbitrary and the biodegradable laminated resin sheet 1 has a flatness. The thickness is not particularly limited as long as the thickness can be maintained.

The biodegradable plastic used here can be used in the same way as ordinary plastic during use, and after use, microorganisms take part in nature to become low molecular weight compounds, which eventually become water and dioxide. It is a plastic that breaks down into carbon.

In other words, biodegradable plastics are decomposed by extracellular enzymes such as microorganisms, Under low aerobic conditions (in the presence of oxygen), it is decomposed into carbon dioxide and water under aerobic decomposition conditions (in the presence of oxygen), and finally under aerobic decomposition conditions (in the absence of oxygen). It is decomposed into methane and carbon dioxide.

Further, there is no particular limitation as long as it can be molded into the resin base fabric 2 and the resin laminates 3a and 3b constituting the biodegradable laminated resin sheet 1 of the present invention. As described above, chemically synthesized biodegradable plastics such as polylactic acid, or microbial biodegradable plastics such as polyhydroxybutyrate, or natural biodegradable plastics such as starch-free chemically synthesized green plastic Plastics. In the application shown in FIG. 3, “〇” is most suitable especially when used for the biodegradable laminated resin sheet 1 shown here, “△” is preferable, and no mark is applicable. It indicates that it is possible.

The resin base fabric 2 has a structure of a woven fabric formed by weaving biodegradable plastic into a thread, a structure of a knit formed by knitting a biodegradable plastic into a thread, or a biodegradable plastic. May be a nonwoven fabric such as a spun bond formed into a fibrous form. As shown in FIG. 3, the resin base fabric 2 may be a biodegradable plastic of a microorganism-producing type, a chemically synthesized type, or a natural product type, which may be used alone or in an appropriate blend.

The resin base fabric 2 is preferably made of a biodegradable plastic raw material that is compatible with the resin laminates 3a and 3b. The term “compatible” as used herein refers to a plastic raw material that has a similar chemical structure to the plastic raw material used and that is completely integrated when laminated. Of course, when the resin component is composed of a predetermined resin component alone, or when the plastic component containing a certain component is a mixed system such as a blended or mixed fabric, the plastic raw material forming the resin laminate is composed of the resin component alone. Used as a configured force or as a plastic component containing the above components.

The resin base cloth 2 is arranged so as to be completely interposed between the resin laminates 3a and 3b, and the resin laminates 3a and 3b face each other. It may be configured to have an opening 4 that makes contact. When the resin substrate 2 has the opening 4, the bridge effect between the resin laminates 3 a and 3 b is obtained. The result is a relatively desirable bond strength. In order to obtain a ridge effect when the skin layers on both sides are melted, the thickness of the resin laminates 3a and 3b should be S> It is desirable that the relationship be L 1 (L 2).

Furthermore, it may be a condition that a minimum force S is secured, which is equal to or greater than the opening length corresponding to the thickness of the skin layer (the shorter one in the case of a rectangle). The configuration of the opening 4 is not particularly limited with respect to its shape, but may be square, rectangular, or another shape.

Examples of the resin base fabric 2 include aliphatic polyesters PBS and PBSA (Pionore of Showa High Polymer), which are biodegradable plastics of chemical synthesis, and PLLA, which is polylactic acid (Lishia of Mitsui Chemicals). Is used here. Next, the resin laminates 3a and 3b are formed with the same thickness here. In addition, regarding the blending of the resin laminates 3a and 3b, if a chemically synthesized biodegradable plastic and a natural product based biodegradable plastic are mixed at a predetermined ratio, it is excellent in biodegradability and has one processability. A resin laminate that can be used as a sheet having high flexibility can be obtained. Here, a preferable mixing ratio of the natural biodegradable plastic is in the range of 0.5% by mass to 50% by mass. As the remaining biosynthetic plastics of the chemical synthesis system, for example, a material indicated by a polymer name shown in FIG. 3 is used alone or in a blend at a predetermined ratio. The raw material thus mixed is melted and made into a paint, and is laminated on both surfaces of the resin base fabric 2.

The resin base fabric 2 and the resin laminates 3a, 3b are joined by welding the resin base fabric 2 and the resin laminates 3a, 3b in a sheet shape by heat. It does not matter.

Further, the resin base fabric 2 of the biodegradable laminated resin sheet 1 and the resin laminates 3a and 3b are desirably the same or similar in chemical composition. As a preferable approximate index, the following table summarizes typical examples of the “agglomerated energy density” of the resin used for each resin base fabric 2 and resin laminates 3a and 3b.

Cohesive Energy Density (C ED) is a value related to the intermolecular force of a polymer, which is released when it is coagulated into a crystalline or amorphous solid state at a certain temperature. It is defined as energy divided by volume. In the present invention, a material whose cohesive energy density is as close as possible is defined as an approximate component. That is, in the preferred embodiment of the present invention, the materials for the resin base fabric 2 and the resin laminates 3a and 3b are selected based on a known cohesive energy density.

When the opening diameter is maintained, the resin base fabric 2 can obtain relatively desirable adhesive strength due to the bridging effect between the resin laminates 3a and 3b. The chemical components of the base fabric 2 need not be similar.

Further, the biodegradable laminated resin sheet 1 has the following characteristics when the processing characteristics are examined under the same conditions as the comparative example (not shown) having the same configuration.

For example, when high-frequency welding is performed, it is almost equivalent to chloride chloride. Shows high frequency welder workability. This is because the resin base fabric 2 and the resin laminates 3 a and 3 b of the biodegradable laminated resin sheet 1 each use a resin having a polar group. This is because heat is generated by the vibration of the steel and the weldability is excellent.

Furthermore, the biodegradable laminated resin sheet 1 has excellent tensile strength, and

-Has almost the same tensile strength as In addition, the raw laminated angle resin sheet

No. 1 is also excellent in 180 ° peel strength, and has a peel strength almost equivalent to that of Shiridani Bull.

In addition, as a laminated sheet molded article molded from the biodegradable laminated resin sheet 1, there is a turbo phosphorus poly laminate sheet which requires a laminate having excellent water resistance, abrasion resistance, cutting properties, and weldability. It can be used as a sheet widely used in various fields such as industrial use and daily goods. For example, in the industrial field, etc., flexible containers and flexible packaging materials for logistics applications, civil engineering sheets in the civil engineering and construction fields, open stacking sheets, curing sheets, leisure products in the general sundries field, special aprons, various packaging materials, These are large banners and flags that are used as advertising media for indoors and outdoors.

The biodegradable laminated resin sheet thus configured can be biodegraded in about 4 to 60 days under composting conditions under which microorganisms can be actively activated. By burying it in the soil, it can be biodegraded in about 3 to 12 months, depending on the season and soil conditions.

Hereinafter, examples of the present invention will be described with reference to Table 2. Note that the present invention is not limited to this embodiment.

(Example 1)

A base yarn (made of resin) made of 200,000-duel flat yarn made of aliphatic polyester, which is one of the chemically synthesized biodegradable plastics, is woven in a plain weave at a density of 10 x 10 and 10 in. Base cloth) was obtained. Next, as a resin for the skin (resin laminate), 70% by mass of an aliphatic polyester-based biodegradable plastic, polybutylene succinate (Bionore # 100000, manufactured by Showa Polymer Co., Ltd.) was used. About 30% by mass of Matapy NF 01 plastic A resin sheet having a thickness of 0.2 mm was prepared from the melt-kneaded mixture using a premixer using a calender roll at 120 to 140 ° C. and laminated on both surfaces of the base material. The peel strength between the base material and the surface layer of the obtained laminate was measured under the conditions described below, and the skin layers were welded to each other with a high-frequency welder under the conditions described below to obtain a 180 ° peel strength. Tensile strength was measured.

(Example 2)

500 dur (96 f) fibers made of polylactic acid, one of the chemically synthesized biodegradable plastics, are woven in a plain weave at a driving density of 20 fibers vertically and 20 fibers horizontally per inch. A substrate (resin base fabric) was obtained. Next, as a resin for coating (resin laminate), 70% by mass of polybutylene succinate (Pionole # 100000 manufactured by Showa Kobunshi), which is an aliphatic polyester-based biodegradable plastic, was used. Matabi NF 01 is a plastic 30 mass ⁰ /. The resin was melt-kneaded in advance with a premixer to prepare a 0.2 mm resin sheet with a calender roll at 120 to 140 ° C., and laminated on both surfaces of the base material. The peel strength between the base material and the surface layer of the obtained laminate was measured under the conditions described below. Further, the skin layers were welded to each other using a high-frequency welder under the conditions described below, and the 180 ° peel strength and the shear strength were measured. The strength was measured.

(Comparative Example 1)

A 200-denier flat yarn made of polyethylene, which is one of the plastics of olefins, is woven in a plain weave at a driving density of 10 lines x 10 lines / inch and the base material (resin base cloth) is formed. Obtained. Next, as a resin for skin (resin laminate), polybutylene succinate, which is an aliphatic polyester-based biodegradable plastic

(Showa Polymer's Pionore # 100000) 70% by mass and 30% by mass of natural material-based biodegradable plastic Matapy NF 01 were melt-kneaded with a premixer in advance. A 0.2 mm resin sheet was prepared with a calender roll at 120 to 140 ° C., and laminated on both sides of the base material. Peel strength of the base material and surface layer of the obtained laminate was measured under the conditions described below, and the skin layers were welded to each other by a high-frequency elder under the conditions described below to obtain a 180 degree peel strength and a shear strength. Was measured. (Comparative Example 2)

Using a 500 denier polyester filament system (96 f), which is one of the synthetic fibers, weave in a plain weave with a driving density of 20 lines vertically and 20 lines horizontally per inch. ) Got. Then, the coating resin polybutylene succinate (Showa High content child made Pionore # 1 0 0 0) is an aliphatic poly ester-based biodegradable plastic as (resin laminate) 7 0 mass ^_0/0, natural products About 30% by mass of Matapy NF 01, a biodegradable plastic, was previously melt-kneaded with a pre-mixer, and then 0.2 mm resin sheet with a calender at 120 to 140 ° C. Was prepared and laminated on both sides of the base material. The peel strength between the base material and the surface layer of the obtained laminate was measured under the conditions described below. Further, the skin layers were welded to each other with a high-frequency welder under the conditions described below, and the 180 ° peel strength was measured. The shear strength was measured.

(Comparative Example 3)

A base fabric (resin base fabric) woven in a plain weave at a driving density of 20 filaments by 20 filaments / inch using a 500-denier polyester filament system (96 f), which is one of synthetic fibers I got Next, a soft vinyl chloride sheet was used as a coating resin (resin laminate). This soft chlorinated vinyl sheet contains 50% by mass of a chlorinated butyl resin (degree of polymerization: 140,000 manufactured by Vittek Co., Ltd.), 40% by mass of a plasticizer (DOP manufactured by Dainippon Ink Co., Ltd.), and calcium carbonate. About 3% by mass (calcium Shiroishi), 4% by mass of stabilizer (Adecaizer), and 3% by mass of facial medicine, melt-kneaded with a pre-mixer in advance, using a calender roll at 170 to 190 ° C. A 0.2 mm resin sheet was prepared and laminated on both sides of the substrate. The peel strength between the base material and the surface layer of the obtained laminate was measured under the conditions described below. Further, the skin layers were welded to each other with a high-frequency welder under the conditions described below, and the 180 ° peel strength and the shear strength were measured. Was measured. Two

Performance comparison of (Example 12 and Comparative Example 13)

(Measurement method and criteria)

Breaking strength 'elongation: JIS-L-1096 6.1 2.1 (1) A method Constant speed elongation method Tear strength: JIS-Shichi 1096 6.1 5.4 C method Trazoid method Welder's strength' Welder peel strength : JIS-K6006 according to A6008

Biodegradability: According to JIS-K-1 6953

Replacement form (Rule 26) The breaking strength and elongation were measured by JIS-L-1096 6.12.1 (1) A method and constant-speed elongation method. The tear strength was determined by the JI SL-1096 6.15.4C method and the transoid method. Furthermore, the welder shear strength and the welder peel strength were determined in accordance with JIS-A6008. Furthermore, as the processing conditions for the high-frequency welder, the output was set to 3 kW, the generated current was set to 0.26 A, and the processing time was set to 1 second using the Seidensha KW3000 T, and the processing time was set to 1 second without blade preheating. Performed under the conditions.

As can be seen from the above Examples and Comparative Examples, when the base material component and the skin resin are similar components (Example 1), the peel strength is higher than in Comparative Example 1 in which the components of the base material and the skin resin are separated. The properties are much better, and it has almost the same processing properties as chloride chloride sheet.

Further, in Example 2 having an opening diameter of 0.5 mm × 0.5 mm of the base cloth, the chemical components of the base material and the skin resin were similar, and a practically sufficient peel strength was obtained. .

Furthermore, the adhesive strength (peel strength and shear strength) of the laminates after welding is the same or a resin with chemical components similar to each other. Adhesive strength has been obtained. Industrial applicability

As described above, the biodegradable laminated resin sheet and the laminated sheet molded article according to the present invention have the following excellent effects.

(1) The biodegradable laminated resin sheet will exhibit biodegradability as a whole laminated resin sheet, and will adversely affect the environment due to the generation of endocrine disrupting substances such as dioxins in the use of turbolin and poly laminate sheets. It can be used without.

(2) The biodegradable laminated resin sheet may be composed of a woven fabric, a knitted fabric, or a non-woven fabric as the base fabric, and has excellent heat welding processability and biodegradability while ensuring sufficient strength. It becomes possible.

(3) The biodegradable laminated resin sheet is composed of a resin base fabric and a resin laminate at the lamination temperature. Since it is composed of biodegradable plastic raw materials that are chemically compatible, it has the same peel strength and high-frequency welder processing characteristics as chloride chloride.

(4) The biodegradable laminated resin sheet has a configuration in which the resin laminate faces and welds to the opening of the resin base fabric, so the variety of choice between the resin base fabric and the resin laminate is widened. .

(5) The biodegradable laminated resin sheet formed from the biodegradable laminated resin sheet is formed into a molded article, and the biodegradable laminated resin sheet is molded by using a high-frequency girder so as to be environmentally friendly. It is possible to obtain a sheet-like product having excellent properties.

Claims

The scope of the claims

1. A resin base fabric for reinforcement, and a resin laminate laminated on both sides of the resin base fabric, wherein the resin base fabric and the resin laminate are made of biodegradable plastic. A biodegradable laminated resin sheet, characterized in that:

2. The biodegradable laminated resin sheet according to claim 1, wherein the resin base fabric is a biodegradable woven fabric, a biodegradable knitted fabric, or a biodegradable nonwoven fabric.

3. The biodegradable resin according to claim 1, wherein the resin base fabric and the resin laminate are made of a biodegradable plastic raw material that is chemically compatible at a lamination temperature. Laminated resin sheet.

4. The biodegradable product according to claim 2, wherein the resin base fabric and the resin laminate are made of a biodegradable plastic raw material that is chemically compatible at a lamination temperature. Laminated resin sheet.

5. The resin base fabric has an opening enough for the resin laminates laminated on both sides at the laminating temperature to adhere to each other, and the resin laminates laminated on both surfaces of the base fabric. The biodegradable laminated resin sheet according to claim 1, wherein each of the biodegradable plastic sheets is composed of biodegradable plastics that are chemically compatible at a lamination temperature.

6. The resin base fabric has an opening sufficient for the resin laminates laminated at both sides at the laminating temperature to adhere to each other, and the resin laminates laminated on both surfaces of the base fabric. The biodegradable laminated resin sheet according to claim 2, wherein each of the biodegradable plastic sheets is composed of biodegradable plastics that are chemically compatible at a lamination temperature.

7. The resin base cloth has an opening enough for the resin laminates laminated at both sides at the lamination temperature to adhere to each other, and the resin laminates laminated on both sides of the base cloth. 4. The laminated biodegradable resin sheet according to claim 3, wherein the laminated plastic sheets are composed of biodegradable plastics that are chemically compatible at a lamination temperature.

8. A molded article of a biodegradable laminated resin sheet formed from the biodegradable laminated resin sheet according to any one of claims 1 to 7.

9. The biodegradable laminated resin sheet is a sheet formed by a high-frequency welder. Item 10. The molded article of a biodegradable laminated resin sheet according to Item 8.