JPH0939086A - Low foamed ethylene polymer resin sheet thermoformed object and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a low foamed ethylene polymer resin sheet thermoformed object having proper flexibility and capable of being subjected to deep drawing sharp in draw shape while keeping a foamed state good by using an ethylene polymer resin having specific foaming magnification. SOLUTION: A foaming agent is compounded with an ethylene polymer resin and the resulting compound is melted and kneaded under such a temp. condition that the temp. of the resin is 170-240 deg.C in a usual kneading extruder and extruded from the slit of a die to produce a low foamed ethylene polymer resin with foaming magnification of 1.01-3 times and a thickness of 0.1-5mm. In a sheet thermoformed object, recessed parts 2a or protruding parts 2b are formed to the low foamed sheet. Concretely, a molded object such as an ampule case 1 wherein recessed parts 2a coinciding with an ampule shape are formed to the low foamed ethylene polymer resin sheet 2 or recessed parts 2a coinciding with a can shape are formed to a laminated sheet wherein a high foamed polyethylene resin sheet is laminated to the rear surface of the sheet layer 2 is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a moderate flexibility,
The present invention relates to a deep-drawn sheet thermoformed body and a method for manufacturing the same.

[0002]

2. Description of the Related Art Various molded articles such as containers, inner cases (guess), trays and underlays manufactured by thermoforming methods such as vacuum molding, air pressure molding, vacuum / pressure molding, and embossing of thermoplastic resin sheets are known. It is widely used because it is relatively inexpensive. However, some of these compacts are rigid,
There were problems that it was too rigid to be used, that it would be easily injured if it cracked, and that it would be desirable to further improve the feel to the touch.

[0003] More specifically, in the case of a sheet in which a concave portion conforming to the shape of an article is formed, for example, an IC storage case or a metal can storage case is too rigid to easily damage a product to be stored. In case of glass products such as cosmetics and liquor, it is easy to drop glass products etc. because it is slippery, or it is too hard to use with pads etc. that are in contact with the human body, or face or fingers in broken parts for toys etc. There were problems such as easy injury. Therefore, in the case of the above specific example, a paper sheet laminated with a velvet cloth, a cloth product containing cotton, or a highly foamed resin sheet is currently used.

[0004] However, there is a problem that it is difficult to give a high-quality feeling to paper, and that the production process becomes complicated and costs increase for cloth products. In a highly foamed resin sheet, for example,
In the case of expanded polystyrene, there is a problem that the material is too hard to recover when deformed, it is difficult to maintain the initial shape, and it is not suitable for sheet thermoforming. In the case of foamed polyurethane, there is a problem that the thermoforming of uniform and good deep drawn sheets cannot be performed except for the material being too hard. There is a problem that it can not fit properly.

[0005]

Therefore, foamed polyethylene can be considered as a highly foamed resin sheet material.
When thermoforming, the foam cells are liable to tear, and if deep drawing or sharp shaping is attempted to form a sharp shape, the foam cells will break if the foam is stretched strongly locally. There is a problem that it is impossible to form a deep drawn molded product having a clear shape or a complicated drawn shape, and a good molded product cannot be obtained. Therefore, the present invention provides a thermoformed body of a low-foaming ethylene polymer resin sheet which has appropriate flexibility and is capable of performing deep drawing with a sharp drawn shape while maintaining a good foaming state and its production. It is intended to provide a method.

[0006]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in view of the above problems, a low-foaming ethylene polymer resin sheet having a specific property is used and thermoformed The present invention has been completed based on the knowledge that the above object can be achieved. That is, the thermoformed sheet of the present invention is made of an ethylene polymer resin and has a foaming ratio of 1.01 to 3 times. In addition, another method of producing a thermoformed sheet according to the present invention is to extrude an ethylene polymer resin containing a foaming agent to obtain a foamed sheet having a foaming ratio of 1.01 to 3 times. Laminating the sheet with another base material layer, or
It is characterized in that it is thermoformed without being laminated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

[I] Raw Material (1) Ethylene Polymer Resin (a) Type As the ethylene polymer resin constituting the sheet thermoformed body of the present invention, an ethylene homopolymer, or ethylene as a main constituent component, And other α-olefins and /
Alternatively, a copolymer with another unsaturated monomer can be mentioned. Examples of the α-olefin include about 3 to 12 carbon atoms, such as propylene, butene-1, 3-methylpentene-1, 4-methylpentene-1, hexene-1, and octene-1, and preferably 3 to 8 carbon atoms. Α-olefins. Examples of the other unsaturated monomers include, for example, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, and maleic anhydride, and derivatives thereof; vinyl acetate, vinyl butyrate, and the like. Esters; unsaturated aromatic monomers such as styrene, methylstyrene and divinylbenzene; and vinylsilanes such as vinyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

Among these, ethylene polymer resins which are preferable in terms of foam moldability and vacuum moldability include a low-density ethylene homopolymer produced by a high-pressure method, ethylene and vinyl acetate containing mainly ethylene, acrylic acid, and acrylate. , A copolymer of methacrylic acid, methacrylate, etc .; a high-density ethylene homopolymer produced by a medium-low pressure method, ethylene and propylene containing ethylene as a main component, and butene-
And linear copolymers with other α-olefins such as 1, hexene-1, and octene-1. These copolymers are not limited to binary copolymers, and may be ternary or higher copolymers. Among these, particularly preferred ethylene polymer resins are low-density ethylene homopolymer (LDPE) produced by a high-pressure method, ethylene-vinyl acetate copolymer (EVA), and high-density ethylene homopolymer produced by a medium-low pressure method. It is a polymer (HDPE), a linear copolymer of ethylene and another α-olefin (L-LDPE). The content of the α-olefin and / or other unsaturated monomer in the ethylene polymer resin in the ethylene polymer resin may be in a range in which ethylene is the largest component as long as the effects of the present invention are not significantly impaired. However, it is generally preferably 30% by weight or less, particularly preferably 15% by weight or less.

(B) Physical Properties As for the physical properties of the ethylene polymer resin, the MFR (melt flow rate) is generally 0.1 to 10 g / 10 minutes, more preferably 0.2 to 8 g / 10 minutes, and particularly 0.3. ~ 6g / 10
In general, the MT (melt tension) is preferably 2 to 20 g, more preferably 3 to 16 g, particularly preferably 4 to 12 g. Furthermore, ethylene polymer resin is
The value (molecular weight distribution) is generally 2 to 9, more preferably 3 to
It is desirable that it is 8, especially preferably 4-7. If the MFR value is too low, the surface gloss of the foam tends to deteriorate, while if it is too high, the mechanical strength tends to deteriorate. Further, if the MT value is too low, it tends to be difficult to obtain a high-magnification foam, while if it is too high, the foam cells tend to become rough. If the Q value is too low, the vacuum formability tends to decrease, while if it is too high, the impact strength of the foam tends to deteriorate.

(2) Foaming agent As the foaming agent, various ones can be used as long as they are used for low foaming. For example, chemical foaming agents such as azodicarbonamide, sodium bicarbonate / citric acid, sodium bicarbonate and the like can be used. Although a physical foaming agent such as butane, pentane, hexane, and butanol may be used, the use of the above-mentioned chemical foaming agent is preferable in that an appropriate amount of gas can be generated for low foaming. These foaming agents can be used in combination. Among these blowing agents, it is particularly preferable to use azodicarbonamide. The amount of the foaming agent used is generally 0.01 to 0.2% by weight, preferably 0.0 to 0.2% by weight.
2 to 0.1% by weight, particularly preferably 0.02 to 0.07%
It is blended in a ratio of weight%.

(3) Other compounding agents (optional components) In the ethylene polymer resin constituting the thermoformed sheet of the present invention, other than the above-mentioned foaming agent, other than the above-mentioned foaming agent, to the extent that the effect of the present invention is not significantly impaired. Optional components can be blended. Examples of the optional components include elastomer components and other resin components, or antioxidants, heat stabilizers, light stabilizers, colorants, antistatic agents, antibacterial agents, for the purpose of adjusting physical properties and appearance. Antifungal agent, rust preventive agent, foam regulator (foaming accelerator), foaming agent decomposition temperature regulator, neutralizing agent, conductivity imparting agent, dispersant, molecular weight regulator (radical generator, etc.), crosslinking agent, crosslinking aid Agents, nucleating agents, fillers, lubricants, flame retardants, flame retardant aids, processing aids, heavy metal deactivators, plasticizers, optical brighteners, release agents, softeners, gloss imparting agents, etc. An additive component etc. can be mentioned.

[II] Production of Sheet Thermoformed Article Various methods can be adopted for producing the sheet thermoformed article of the present invention. Generally, the above-mentioned ethylene polymer resin is mixed with the above-mentioned foaming agent. By melt-kneading and extruding this to produce a low-foaming ethylene polymer resin sheet (foaming sheet), it is subjected to thermoforming such as vacuum forming, pressure forming, vacuum / pressure forming, and embossing. It is preferred to produce sheet thermoformed bodies of various shapes.

(1) Production of low foamed ethylene polymer resin sheet (foam sheet) (a) Molding conditions The above foaming agent is blended with ethylene polymer resin, and these are mixed with a usual kneading extruder, for example, a single screw extruder. In a twin screw extruder or the like, the resin temperature is generally 170 to 240 ° C., preferably 1 to 240 ° C.
The mixture is melt-kneaded under a temperature condition of 80 to 230 ° C. and extruded from a slit of a die to obtain an expansion ratio of 1.01 to 3.
Times, preferably 1.1 to 2 times, particularly preferably 1.3 to 2 times.
Foamed 1.8 times, the thickness is generally 0.1-5mm,
Preferably, a low foamed ethylene polymer resin sheet (foamed sheet) of 0.2 to 3 mm can be produced. This sheet is obtained as a non-crosslinked low foam sheet. When the expansion ratio is too low, it is possible to make one having poor flexibility,
In the next thermoforming step, beautiful shaping may not be possible. On the other hand, if the expansion ratio is too high, the molding will be defective in the next thermoforming step. The foam sheet obtained here is
Also in the later-described thermoforming, since the foaming state can be formed without pulling while maintaining a good foamed state, the drawn shape can be clearly formed, which is preferable. By the above molding, a large number of foam cells are generated in the foam sheet,
In the foam sheet of the present invention, the foam cells are fine, they are uniform, and the average size of the foam cells is generally 0.0
What is in the range of 5 to 0.5 mm, preferably 0.1 to 0.4 mm, particularly preferably 0.15 to 0.3 mm, the foam cells are hardly broken even when thermoformed later,
This is preferable because the drawn shape can be clearly obtained while the foaming state is maintained well. The average size of such foam cells can be prepared by appropriately selecting the type of foaming agent, its amount, and the conditions at the time of compounding it.

(B) Lamination The low-expanded ethylene polymer resin sheet (foamed sheet) can be subjected to thermoforming by itself, but it can be laminated with another material sheet (base layer). It can also be subjected to thermoforming as a laminated body. By laminating with such another material sheet (substrate layer), it is possible to obtain a more beautiful one with improved shape and rigidity, a molded body with excellent feel, and the like. In particular, by laminating with a woven or nonwoven fabric, there is also an advantage that a drawdown at the time of vacuum forming described later can be prevented.

Examples of the laminated base material sheet (base layer) include, for example, an unfoamed resin (ethylene polymer, propylene polymer, styrene polymer, etc.) sheet, another foamed resin sheet, and an elastomer ( Ethylene / propylene copolymer rubber, ethylene / butene copolymer rubber, styrene / butadiene copolymer rubber, styrene / butadiene / styrene block copolymer hydrogenated product, styrene / isoprene / styrene block copolymer hydrogenated product, Butadiene rubber etc.) sheet,
Alternatively, a woven or non-woven fabric of polyester fiber, nylon fiber, polypropylene fiber, or the like can be used.
Among these other base material layers, it is preferable to use a polyethylene foamed sheet, a woven or non-woven fabric of polyester resin or nylon resin, or the like. In addition, various functional agents described in the above optional components, for example, an antistatic agent, an antibacterial agent, an antifungal agent, a rust inhibitor, a conductivity imparting agent, a flame retardant, a coloring agent, and the like may be added to an ethylene polymer resin foam sheet and / or Alternatively, a thermoformed article having the respective functions can be obtained by containing it in a base material layer laminated therewith.

(2) Thermoforming The above low-foaming ethylene polymer resin sheet (foaming sheet)
Is heated and softened by various thermoforming methods such as the following vacuum forming method, pressure forming method, vacuum / pressure forming method, and embossing forming method, and is subjected to external force by means such as vacuum or pressure. The sheet thermoformed product of the present invention can be obtained by adding, deforming, shaping into various shapes, and then cooling. (a) Vacuum Forming Method As the above-mentioned vacuum forming method, only one of the female mold and the male mold is used to heat and soften the foamed sheet, and then the foamed sheet is placed on the mold, and a gap between the sheet and the mold is formed. Is a vacuum to bring the sheet into close contact with the surface of the mold, and the sheet is cooled and molded.
Specifically, straight molding, drape molding, plug assist molding, plug assist reverse draw molding, air slip molding, snapback molding, reverse draw molding, plug assist air slip molding, free molding, match molding, plug ring Various known molding methods such as molding, slip molding, and contact heating molding can be employed. (b) Pneumatic molding method The above-mentioned pneumatic molding method is a method in which a sheet softened by heating with compressed air is pressure-bonded to a mold instead of utilizing the atmospheric pressure in the vacuum molding. (c) Vacuum / compressed air forming method The vacuum / compressed air forming method is a method in which the vacuum forming and the pressure forming are combined. (d) Embossing molding method As the embossing molding method, the heat-softened foamed sheet is inserted between the upper and lower pedestals and pressed by a mold, or the foamed sheet is heated as it is. It is a method of pressing and molding. The thermoforming is carried out by a usual thermoforming device according to a conventional method.

[0017] deep drawing in general thermoforming of the foam sheet, as the shape aperture while maintaining good foaming state out clearly, it is difficult to perform deep drawing narrow to more than a depth of typically 30 mm, the In the present invention, surprisingly, deep drawing can be performed to a depth of 30 mm or more, preferably 40 mm or more, particularly preferably 50 mm or more. In the deep drawing, since the sheet surface and the deep drawn wall surface can be bent and formed to an angle of about a right angle, extremely to an inverse taper, the drawn shape can be formed clearly. . At this time, advanced deep drawing can be performed because the foam cells are fine and the dimensions are uniform, so the foam cells do not break even when thermoformed and a good foam state is maintained. It is presumed that this is because deep drawing can be performed evenly without being biased in one direction. It was surprising that the deep drawing as described above was achieved by using the low foamed ethylene polymer resin sheet (foamed sheet) as a thermoforming material as in the present invention. The present invention can of course be applied to a molded article that is not drawn in thermoforming.

(3) Cutting The thermoformed body thermoformed into the above-mentioned various shapes is cut so as to meet various purposes and separated from the foamed sheet on the thermoforming machine. Generally, a cutting blade is used. It is carried out by the method of punching. At this time, in the ethylene polymer resin raw material,
It is preferable to add a small amount of a polyolefin that is usually used as an anti-blocking agent to the polyolefin in advance, since the blade separation at the time of cutting is good and the punching property is good.

[III] Sheet Thermoformed Body (1) Shape The thus obtained sheet thermoformed article of the present invention is an ethylene polymer resin (preferably having a thickness of 1.01 to 3 times the expansion ratio). A low-foaming sheet composed of 0.1 to 5 mm), in which concave portions 2a and convex portions 2b are formed (preferably, at least a part of the molded body is deep-drawn to a depth of 30 mm or more). Specifically, as shown in FIG.
An ampoule case 1 in which a recess 2a conforming to the shape of an ampoule is formed in a low-foaming ethylene polymer resin sheet 2, and FIG.
As shown in FIG. 3, a high-foaming polyethylene resin sheet (foaming ratio 30
An inner case 6 for housing a can, in which a recessed portion 2a conforming to the shape of the can is formed in a laminated sheet 5 in which four times) 4 are laminated, or FIG.
An inner case (guth) 10 in which a concave portion 2a conforming to the shape of a sake bottle 9 or the like is formed in a laminated sheet 8 in which a polyester woven fabric layer 7 is laminated on the surface side of a low-foaming ethylene polymer resin sheet layer 2 as shown in FIG. And the like.

[IV] Applications In such a thermoformed body of the low-foaming ethylene polymer resin sheet of the present invention, it is possible to perform deep-drawing with a large depth, and therefore various types of applications for various applications are possible. It can be formed into a thermoformed body. Applications of the thermoformed article include, for example, an ampoule case as shown in FIG. 1, an can case inner case as shown in FIG. 2, an antistatic storage case such as an IC, an eyeglass inner case, a distribution tray, and an instant. A food container, an inner case (guess) such as Western sake with a woven fabric laminated on the surface as shown in FIG. 3, or an outer case (guess) for cosmetics, drinks, etc., and a brightener such as wax or oil, etc. Cushion holders (holders to protect objects that come into contact with metal cans, etc.) that are fitted to the surface of containers such as metal cans to be stored, shoe insoles, brassiere pads, hat collars, toy masks, document binders, etc. Can also be used as

[0021]

EXAMPLES The present invention will be described in more detail with reference to the following experimental examples. [I] Raw materials (a) Ethylene polymer LD / PE (high-pressure low-density ethylene homopolymer): MFR 4 g / 10 min,: MT 5 g: Q value 6.2 LD / PE (high-pressure low-density ethylene homopolymer): MFR 0.3 g / 10 min,: MT 12 g: Q value 6.0 EVA (ethylene / vinyl acetate copolymer): MFR 0.5 g / 10 min,: MT 11 g: Q value 5.5 HD / PE (high-density ethylene) Homopolymer): MFR 0.6 g / 10 min,: MT 9 g: Q value 5.6 L-LD / PE (copolymer of ethylene and 7 wt% butene-1): MFR 0.8 g / 10 min, : MT 5g: Q value 7.0

(B) Blowing agent AA: azodicarbonamide CS: 1: 1 mixture of sodium bicarbonate and citric acid

(C) Laminated material Polyester woven fabric: 0.40 m thick, manufactured by Toray Industries, Inc.
m was used. Polyethylene resin sheet: JSP 0.20 thickness
mm was used.

[II] Evaluation method (1) Resin physical properties The MFR melt flow rate (MFR) was measured according to JIS K7210.
Is a value measured at a temperature of 190 ° C. and a load of 2.16 kgf. M T melt tension (MT) is used Capillograph manufactured by Toyo Seiki Co., melting drop speed 10 mm / min, a value measured extrusion, by haul-off speed 4m / min at a temperature 190 ° C.. Q value The Q value (molecular weight distribution) is a value measured by gel permeation chromatography (GPC).

(2) Evaluation Expansion Ratio The expansion ratio is a value obtained by measuring the densities before and after foaming using a pycnometer and dividing the density before foaming by the density after foaming. Foam Cell Size The average size of the foam cell is a value obtained by magnifying and seeing through a surface sliced in the thickness direction and the parallel direction of the foam using a microscope and measuring the average size of the cells. The drawing depth (mm) of the formed body was measured using a vacuum forming machine (ASANO
(Manufactured by Co., Ltd.) is a value obtained by measuring the maximum drawing depth that can be formed using a cylindrical mold having an opening of 150 ^mmφ .

[III] Experimental Examples Examples 1 to 5 and Comparative Examples 1 and 2 (1) Molding of Low Foamed Ethylene Polymer Resin Sheet A 90 mm diameter twin-screw extruder manufactured by Masculo Co., Ltd. was compounded according to the compounding composition shown in Table 1. And it extruded at the forming temperature of 180 degreeC using the die, and formed the low foaming ethylene polymer resin sheet of thickness 1mm. Next, the expansion ratio and the dimensions of the expanded cells of the low-expanded ethylene polymer resin sheet were measured, and the results are shown in Table 1. (2) Vacuum forming Next, this low foamed ethylene polymer resin sheet is
Using a vacuum forming machine (Model M330) manufactured by O Corporation, the mold heater temperature was set to 260 ° C., and vacuum forming was performed to perform deep drawing. The maximum depth at which good deep drawing could be performed without breaking the foam cells or making holes in the low foam ethylene polymer resin sheet was measured. (3) Results Table 1 shows the above results. In addition, as for the obtained vacuum-formed body, what was manufactured in the Example all had a pearl-like appearance.

Example 6 A low foamed ethylene polymer resin sheet was produced in the same manner as in Example 1 except that the thickness of the low foamed ethylene polymer resin sheet was changed to 0.3 mm. A polyester woven fabric (0.40 mm thick) is laminated on the ethylene polymer resin sheet, and the mold heater temperature is set to 2
Vacuum forming with the temperature set at 60 ° C, drawing depth approx. 52
mm inner case for Western sake was thermoformed and cut. The foamed state of this molded product was clearly drawn while maintaining a good foaming state, and the appearance was satisfactory with a pearl-like appearance.

Example 7 A low-foaming ethylene polymer resin sheet was produced in the same manner as in Example 1, except that the thickness of the low-foaming ethylene polymer resin sheet was changed to 0.2 mm. Foaming ratio 8 times, thickness 0.2 on ethylene polymer resin sheet
mm high-expanded polyethylene polymer resin sheets were stacked, vacuum-molded at a mold heater temperature of 260 ° C., and an inner case for can storage with a drawing depth of about 50 mm was thermoformed and cut. The foamed state of this molded article is clearly drawn while maintaining good condition, and,
The appearance was also pearly and satisfactory.

[0029]

[Table 1]

[0030]

The sheet thermoformed article of the present invention is a low-foamed article having appropriate flexibility, and since the foamed cells are fine and the dimensions are uniform, the foamed cells can be formed even when thermoformed. It is possible to perform deep drawing at a high level because it is possible to perform deep drawing evenly without deviating in one direction while maintaining a good foaming state without breaking.

In the deep drawing, since the sheet surface and the deep drawn wall surface can be bent and formed to an angle of about a right angle, and extremely to an inverse taper, the drawn shape is formed clearly. be able to.

In the thermoformed sheet of the present invention, since the foam cells are fine and the dimensions are uniform and constant, a pearly appearance can be obtained without adding pigments such as mica and titanium powder. To be

[Brief description of drawings]

FIG. 1 is a perspective view of a thermoformed ethylene polymer resin sheet vacuum-formed into the shape of an ampoule case of the present invention.

FIG. 2 is a perspective view of an inner case for can storage in which a concave portion conforming to the shape of a can is formed in a laminated sheet in which a high-expanded polyethylene resin sheet is laminated on the back side of a low-expanded ethylene polymer resin sheet layer. It is.

FIG. 3 is an inner case (guess) in which a concave portion conforming to the shape of a liquor bottle is formed in a laminated sheet in which a polyester woven fabric layer is laminated on the surface side of a low-foaming ethylene polymer resin sheet layer.
It is a perspective view of.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sheet thermoformed body 2 sheet 2a concave part 2b convex part 3 ampoule case 4 high-foaming polyethylene resin sheet 5 laminated sheet 6 inner case for can storage 7 polyester woven fabric layer 8 laminated sheet 9 western liquor bottle 10 inner case (guess)

Claims (14)

[Claims] 1. A thermoformed sheet comprising an ethylene polymer resin and having an expansion ratio of 1.01 to 3. 2. An ethylene polymer resin having a melt flow rate of 0.1 to 10 g / 10 minutes and a melt tension of 2 to 20.
The sheet thermoformed article according to claim 1, which exhibits a physical property of g. 3. The sheet thermoformed article according to claim 1, wherein the ethylene polymer resin has a Q value of 2-9. 4. A low-density ethylene homopolymer produced by a high-pressure method, an ethylene / vinyl acetate copolymer, and a high-density ethylene homopolymer produced by a medium- and low-pressure method, ethylene. The sheet thermoformed article according to claim 1, which is at least one selected from linear copolymers with other α-olefins. 5. The foam cell has an average size of 0.05 to 0.5 m.
The thermoformed sheet according to claim 1, which is m. 6. A depth of 30 mm in at least a part of the molded body.
The sheet thermoformed body according to claim 1, which has been subjected to the deep drawing. 7. The sheet thermoformed article according to claim 1, wherein the formed article is a laminate of a low-foaming ethylene polymer resin layer and another base material layer. 8. An ethylene polymer resin containing a foaming agent is extruded to form a foamed sheet having a foaming ratio of 1.01 to 3 times, and the foamed sheet is laminated with another base material layer, or laminated. A method for producing a sheet thermoformed body, which comprises performing thermoforming without performing. 9. An ethylene polymer resin having a melt flow rate of 0.1 to 10 g / 10 minutes and a melt tension of 2 to 20.
The method for producing a thermoformed sheet according to claim 8, which exhibits a physical property of g. 10. The method for producing a thermoformed sheet according to claim 8, wherein the ethylene polymer resin has a Q value of 2 to 9. 11. An ethylene polymer resin comprising a low density ethylene homopolymer produced by a high pressure method, an ethylene / vinyl acetate copolymer, and a high density ethylene homopolymer produced by a medium and low pressure method, ethylene. The method for producing a sheet thermoformed article according to claim 8, which is at least one selected from linear copolymers with other α-olefins. 12. The method for producing a thermoformed sheet according to claim 8, wherein the foamed sheet has a thickness of 0.1 to 5 mm. 13. A foam cell having an average size of 0.05 to 0.5.
The method for producing a thermoformed sheet according to claim 8, which has a size of mm. 14. Thermoforming is molding in which at least a part of a foamed sheet is subjected to deep drawing with a depth of 30 mm or more.
The method for manufacturing a thermoformed sheet according to claim 8.