WO2014129344A1 - 深絞り成形用多層樹脂シート及び成形容器 - Google Patents
深絞り成形用多層樹脂シート及び成形容器 Download PDFInfo
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- WO2014129344A1 WO2014129344A1 PCT/JP2014/053019 JP2014053019W WO2014129344A1 WO 2014129344 A1 WO2014129344 A1 WO 2014129344A1 JP 2014053019 W JP2014053019 W JP 2014053019W WO 2014129344 A1 WO2014129344 A1 WO 2014129344A1
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- layer
- resin layer
- styrene
- olefin polymer
- resin sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/406—Bright, glossy, shiny surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Definitions
- the present invention relates to a multilayer resin sheet for deep drawing and a molded container formed by molding the same.
- styrenic resins having excellent thermoformability and rigidity have been used as containers for soft drinks, fruit juice drinks, and favorite foods and drinks.
- an ethylene-vinyl alcohol copolymer resin layer is provided through an adhesive layer such as a modified olefin resin in the middle of the styrene resin layer as an outermost layer to provide oxygen barrier properties, and by oxidation of the contents
- An adhesive layer such as a modified olefin resin in the middle of the styrene resin layer as an outermost layer to provide oxygen barrier properties, and by oxidation of the contents
- Patent Document 1 A multilayer resin sheet in which deterioration in quality is suppressed and a multilayer container comprising the same are widely used.
- Patent Document 2 proposes a multilayer resin sheet in which a polystyrene resin layer and a polyolefin resin layer are laminated to prevent generation of resin whiskers during stamping in the process up to the final product.
- Patent Document 3 proposes a multilayer resin sheet that solves the problem of insufficient notch folding after thermoforming by using a specific layer structure because the oxygen barrier resin is tough. Has been.
- the present invention has been made in view of the above circumstances, and has thermoformability, rigidity, oxygen barrier properties, is easy to impart notch breakability after thermoforming, and has a complicated shape and deep drawing. It is an object of the present invention to provide a deep drawing multilayer resin sheet that is difficult to be fused to a heat source even when a high amount of heat is applied to the container, and a molded container formed by molding the same.
- the present inventor has intensively studied to develop a multilayer resin sheet having the above-mentioned characteristics and suitable for deep drawing, and as a result, the styrene-based polymer layer on both sides of the oxygen-barrier resin layer via the modified olefin polymer layer.
- the multilayer resin sheet in which the resin layers are laminated adjustment of the thicknesses of the modified olefin polymer layer and the styrene resin layer on the notch forming surface side and the surface roughness (Ra of the styrene resin layer on the notch forming surface side) ), It was found that the above-mentioned problems can be solved, and the present invention has been completed.
- the styrene resin layer is laminated on both surfaces of the oxygen barrier resin layer via the modified olefin polymer layer, and the depth at which the notch is formed from one surface side.
- a multilayer resin sheet for drawing wherein the total thickness of the modified olefin polymer layer and the styrene resin layer on the one surface side is 40 to 350 ⁇ m, and one of the styrene resin layers
- the oxygen barrier resin layer is formed of an ethylene-vinyl alcohol copolymer resin.
- the modified olefin polymer layer has a thickness of 10 to 50 ⁇ m.
- the oxygen barrier resin layer has a thickness of 10 to 50 ⁇ m.
- the styrenic resin layer is formed from a styrenic resin containing 4 to 8% by mass of a butadiene rubber component.
- the multilayer resin sheet has a thickness of 500 to 1200 ⁇ m.
- a molded container having a notch formed from the one surface side by thermoforming the deep drawing multilayer resin sheet.
- the multilayer resin sheet for deep drawing according to the present invention has thermoformability, rigidity and oxygen barrier properties, and imparts notch breakability after thermoforming, so that it can be melted into a heat source even when a larger amount of heat is applied during thermoforming. Since it is difficult to wear, it is easy to form into a more complex shape or deep drawn container.
- FIG. 1 It is a schematic longitudinal cross-sectional view which shows the laminated structure of the multilayer resin sheet for high heat quantity thermoforming which concerns on one Embodiment of this invention. It is a schematic perspective view which shows an example of the shaping
- the multilayer resin sheet for deep drawing has a modified olefin polymer layer (11a, 11b) on both sides of an oxygen barrier resin layer (10) as shown in FIG. It is a thermoplastic multilayer resin sheet in which styrene resin layers (12a, 12b) are laminated. A notch is formed from one surface side of the resin sheet (upper styrene resin layer 12a side in FIG. 1), but the modified olefin polymer layer (11a) and styrene resin layer on the one surface side.
- the total thickness of (12a) is 40 to 350 ⁇ m, and the exposed surface roughness (Ra) of the styrene-based resin layer (12a) is 0.1 to 5.0 ⁇ m. .
- deep drawing means that the sheet has characteristics suitable for deep drawing
- deep drawing means the depth and width of the forming container (regardless of the shape of the forming container).
- the aperture ratio which is the ratio of the maximum width in a shape having a plurality of widths, is 0.5 or more.
- the deep-drawn container here is a container having a drawing ratio of 0.5 or more, preferably 0.9 or more, more preferably 1 or more, and most preferably 1.5 or more.
- thermoplastic multilayer resin sheet and a molded container produced by molding the resin sheet will be described in detail.
- Typical examples of the oxygen barrier resin constituting the oxygen barrier resin layer include ethylene-vinyl alcohol copolymer resins and polyamide resins. Among these, ethylene-vinyl alcohol copolymer resin is preferable in terms of processability and moldability.
- the ethylene-vinyl alcohol copolymer resin is usually obtained by saponifying an ethylene-vinyl acetate copolymer, and has an ethylene content of 10 to 10 in order to provide oxygen barrier properties, workability, and moldability. It is preferably 65 mol%, preferably 20 to 50 mol%, and a saponification degree of 90% or more, preferably 95% or more.
- polyamide resin examples include lactam polymers such as caprolactam and laurolactam, polymers of aminocarboxylic acids such as 6-aminocaproic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid, hexamethylenediamine, decamethylenediamine, Aliphatic diamines such as dodecamethylenediamine, 2,2,4- or 2,4,4-trimethylhexamethylenediamine, 1,3- or 1,4-bis (aminomethyl) cyclohexane, bis (p-aminocyclohexyl) Alicyclic diamines such as methane, diamine units such as aromatic diamines such as m- or p-xylylenediamine, and aliphatic dicarboxylic acids such as adipic acid, suberic acid, and sebacic acid, and alicyclics such as cyclohexanedicarboxylic acid Aromatic dicarboxylic acid, ter
- polyamide resins include nylon 6, nylon 9, nylon 11, nylon 12, nylon 66, nylon 610, nylon 611, nylon 612, nylon 6T, nylon 6I, nylon MXD6, nylon 6/66, nylon 6 / 610, nylon 6 / 6T, nylon 6I / 6T, etc., among which nylon 6 and nylon MXD6 are preferred.
- the thickness of the oxygen barrier resin layer is preferably 10 to 50 ⁇ m, more preferably 20 to 40 ⁇ m. If it is less than 10 ⁇ m, there is a possibility that the oxygen barrier performance to the extent that quality deterioration due to oxidation of the contents of the molded container is suppressed cannot be obtained, and if it exceeds 50 ⁇ m, resin whiskers are generated when the thermoformed container is punched. Or notch breakage may be insufficient.
- modified olefin polymer constituting the modified olefin polymer layer include homopolymers of olefins having about 2 to 8 carbon atoms such as ethylene, propylene, and butene-1, and these olefins and ethylene, propylene, and butene-1.
- olefins having about 2 to 20 carbon atoms such as 3-methylbutene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, etc., vinyl acetate, vinyl chloride, acrylic acid Olefin resins such as copolymers with vinyl compounds such as methacrylic acid, acrylic esters, methacrylic esters, styrene, ethylene-propylene copolymers, ethylene-propylene-diene copolymers, ethylene-butene-1 Olefin rubbers such as copolymers, propylene-butene-1 copolymers, acrylic acid, methacrylic acid, Unsaturated carboxylic acids such as rotonic acid, isocrotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid and tetrahydrophthalic acid, or derivatives thereof such as acid halides, amides, imides, anhydrides and esters
- an ethylene resin, a propylene resin, or an ethylene-propylene or butene-1 copolymer rubber modified with an unsaturated dicarboxylic acid or an anhydride thereof, particularly maleic acid or an anhydride thereof is preferable. It is.
- the thickness of the modified olefin polymer layer is preferably 10 to 50 ⁇ m, more preferably 20 to 40 ⁇ m on either side. If it is less than 10 ⁇ m, sufficient interlayer adhesion strength may not be obtained, and if it exceeds 50 ⁇ m, resin whiskering may occur when punching a thermoformed container, or notch breakage may be insufficient. There is.
- styrene resin constituting the styrene resin layer examples include styrene monomers such as styrene, ⁇ -methyl styrene, p-methyl styrene, dimethyl styrene, pt-butyl styrene, and chlorostyrene.
- Copolymers of styrenic monomers and other monomers such as styrene-acrylonitrile copolymers (AS resin), or other polymers such as styrene-based monomers, such as polybutadiene, styrene-butadiene copolymers, poly Examples include graft polymers obtained by graft polymerization in the presence of diene rubbery polymers such as isoprene and polychloroprene, such as high impact polystyrene (HIPS resin) and styrene-acrylonitrile graft polymer (ABS resin).
- HIPS resin high impact polystyrene
- ABS resin styrene-acrylonitrile graft polymer
- polystyrene resin polystyrene (GPPS resin) and high impact polystyrene (HIPS resin) are particularly preferable from the viewpoints of the rigidity and moldability of the molded container.
- GPPS resin polystyrene
- HIPS resin high impact polystyrene
- the styrene resin preferably contains 4 to 8% by mass of a butadiene rubber component.
- the butadiene rubber component content is a simple method of adjusting by blending GPPS and HIPS, but it may be adjusted at the manufacturing stage of HIPS. If it is less than 4% by mass, a practically sufficient container strength may not be obtained. If it exceeds 8% by mass, problems such as adhesion of a hot platen may occur during thermoforming.
- a colorant such as a pigment or a dye, a release agent such as silicon oil or an alkyl ester, or a fibrous reinforcing agent such as glass fiber, as long as the effects of the present invention are not impaired.
- Additives such as particulate lubricants such as talc, clay and silica, salt compounds of sulfonic acid and alkali metal, antistatic agents such as polyalkylene glycol, ultraviolet absorbers and antibacterial agents can be added.
- the scrap resin generated in the production process of the multilayer resin sheet or molded container of the present invention can be mixed and used.
- the thickness of the styrene-based resin layer (12a) on the surface side where the notch is formed is preferably 30 to 300 ⁇ m, more preferably 100 to 200 ⁇ m. If it is less than 30 ⁇ m, the styrene-based resin layer is cut off when it is stretched through thermoforming, and the modified olefin-based polymer layer is exposed, which may impair the proper printing on the container surface. Moreover, when it exceeds 300 micrometers, it is necessary to enlarge the insertion depth of the blade at the time of forming a notch, and there exists a possibility that the holding
- the thickness of the styrene-based resin layer (12b) on the side where no notch is formed is preferably 300 to 800 ⁇ m, more preferably 400 to 700 ⁇ m. If it is less than 300 ⁇ m, the rigidity of the container obtained by thermoforming may be insufficient, and if it exceeds 800 ⁇ m, the notch breakability after forming the notch may be lowered.
- the surface roughness (Ra) of the exposed surface of the styrene resin layer (12a) on the surface side where the notch is formed is 0.1 to 5.0 ⁇ m, preferably 0.5 to 3.0 ⁇ m. . If the thickness is less than 0.1 ⁇ m, the resin layer may be easily fused to the heat source during heat molding. If the thickness exceeds 5.0 ⁇ m, the surface gloss of the obtained molded product is lost, resulting in a reduction in commercial value. May be incurred.
- the surface roughness (Ra) of the exposed surface of the styrene-based resin layer (12b) on the surface side where the notch is not formed is not particularly limited, but is preferably less than 0.1 ⁇ m so as not to cause a reduction in commercial value. .
- the layer structure of the deep drawing thermoplastic multilayer resin sheet according to an embodiment of the present invention is a styrene resin layer / modified olefin polymer layer / oxygen barrier resin layer / modified olefin polymer layer. / although it is a styrene-based resin layer, for example, a multilayer resin sheet of the present invention or a layer of scrap resin generated in the manufacturing process of the molded container may be laminated on the opposite side where the notch is formed.
- the thermoplastic multilayer resin sheet for deep drawing has a total thickness of the modified olefin polymer layer (11a) and the styrene resin layer (12a) on the surface side where the notch is formed.
- the thickness is 40 to 350 ⁇ m, preferably 120 to 240 ⁇ m. If it is less than 40 ⁇ m, the thickness of the styrenic resin layer on the surface side where the notch is relatively formed becomes thin, and the styrenic resin layer breaks when stretched through thermoforming, which impairs the appearance and strength of the container. there is a possibility. Moreover, when it exceeds 350 micrometers, it is necessary to enlarge the insertion depth of the blade at the time of forming a notch, and there exists a possibility that the holding
- the thickness of the deep drawing thermoplastic multilayer resin sheet is preferably 500 to 1200 ⁇ m, more preferably 700 to 1000 ⁇ m. If it is less than 500 ⁇ m, the strength of the container obtained by thermoforming may be insufficient, and if it exceeds 1200 ⁇ m, the production cost of the container may increase.
- the molding method of the deep drawing thermoplastic multilayer resin sheet is not particularly limited, and a general method can be used.
- each raw resin is melt-extruded using four or more single-screw extruders, and a multilayer resin sheet is obtained using a feed block and a T die, or a multilayer resin sheet is obtained using a multi-manifold die Is mentioned.
- thermoplastic multilayer resin sheet for deep drawing of the present invention As a method for imparting a predetermined surface roughness to the exposed surface of the styrene resin layer in the thermoplastic multilayer resin sheet for deep drawing of the present invention, particularly the styrene resin layer (12a) on the surface side where the notch is formed, It does not specifically limit and a general method can be used. For example, when taking the molten resin, there is a method of taking it with a roll or belt that has been subjected to uneven processing in advance.
- ⁇ Molded container> 2 and 3 show an example of the molded container of the present invention.
- the molded container of the present invention is obtained by thermoforming the thermoplastic multilayer resin sheet of the present invention.
- Thermoforming methods include general vacuum forming, pressure forming, and plug assist method in which plugs are formed by contacting a plug on one side of the sheet, and male and female molds that form a pair on both sides of the sheet.
- a method called so-called “match mold molding” in which the molding is performed in contact with each other is exemplified, but the method is not limited thereto.
- a known sheet heating method such as radiant heating with an infrared heater or the like which is non-contact heating can be applied.
- the molding temperature at the time of thermoforming is appropriately set in consideration of the melting point of the resin, etc., but when performing deep drawing with a drawing ratio of 0.5 or more using the resin sheet according to the present invention, The temperature is set to 170 ° C. or higher, preferably 175 to 180 ° C. If the hot platen temperature is less than 170 ° C., the molded state of the container is insufficient due to insufficient heating, and if it is too high, there is a risk of causing problems such as fusion to the hot platen.
- the molded container of the present invention has a notch.
- the notch has a V-shaped cross section, and is heated by a hot plate method or the like on one surface side, that is, the side where the total thickness of the modified olefin polymer layer and the styrene resin layer is 50 to 400 ⁇ m. It can be formed by inserting a shaped blade.
- the resin raw materials used in the examples are as follows. (1) Oxygen barrier resin layer Ethylene-vinyl alcohol copolymer “EVAL J-102B” (manufactured by Kuraray Co., Ltd., ethylene content 32 mol%, saponification degree 99% or more) (2) Modified olefin polymer layer “Modic F502” (Mitsubishi Chemical Corporation) (3) Styrenic resin layer HIPS resin: “Toyostyrene H850” (Toyo Styrene Co., Ltd., butadiene content: 9.0% by mass) GPPS resin: “HRM23” (manufactured by Toyo Styrene Co., Ltd.)
- styrene resin layer (12a) 40 ⁇ m / modified olefin polymer layer (11a) 20 ⁇ m / oxygen barrier resin layer (10) 20 ⁇ m / modified olefin polymer layer (11b) 20 ⁇ m /
- the styrenic resin layer (12b) has a layer configuration of 800 ⁇ m, and has a thickness of 900 ⁇ m (total thickness of the styrene resin layer (12a) and the modified olefin polymer layer (11a) is 60 ⁇ m).
- a multilayer resin sheet having a surface roughness (Ra) of 0.25 ⁇ m was obtained.
- styrene resin layer (12a) 285 ⁇ m / modified olefin polymer layer (11a) 15 ⁇ m / oxygen barrier resin layer (10) 20 ⁇ m / modified olefin polymer layer (11b) 15 ⁇ m /
- the styrenic resin layer (12b) has a layer structure of 665 ⁇ m, and has a thickness of 1000 ⁇ m (total thickness of 300 ⁇ m of the styrene resin layer (12a) and the modified olefin polymer layer (11a)).
- a multilayer resin sheet having a surface roughness (Ra) of 0.30 ⁇ m was obtained.
- styrene resin layer (12a) 30 ⁇ m / modified olefin polymer layer (11a) 15 ⁇ m / oxygen barrier resin layer (10) 20 ⁇ m / modified olefin polymer layer (11b) 15 ⁇ m /
- the styrenic resin layer (12b) has a layer structure of 820 ⁇ m, has a thickness of 900 ⁇ m (the total thickness of the styrene resin layer (12a) and the modified olefin polymer layer (11a) is 45 ⁇ m), and the styrene resin layer (12a).
- a multilayer resin sheet having a surface roughness (Ra) of 0.33 ⁇ m was obtained.
- styrene resin layer (12a) 325 ⁇ m / modified olefin polymer layer (11a) 15 ⁇ m / oxygen barrier resin layer (10) 20 ⁇ m / modified olefin polymer layer (11b) 15 ⁇ m /
- the styrenic resin layer (12b) has a layer structure of 525 ⁇ m, has a thickness of 900 ⁇ m (total thickness of 340 ⁇ m of the styrene resin layer (12a) and the modified olefin polymer layer (11a)), and the styrene resin layer (12a).
- a multilayer resin sheet having a surface roughness (Ra) of 0.28 ⁇ m was obtained.
- Examples 7 to 9 Styrenic resin layer (12a) 165 ⁇ m / modified olefin polymer layer, except that metal rolls with surface roughness (Ra) of 2, 5, and 10 ⁇ m were used, respectively, in the same manner as in Example 1.
- the styrenic resin layer (12b) has a layer structure of 835 ⁇ m, and has a thickness of 900 ⁇ m (total thickness of the styrene resin layer (12a) and the modified olefin polymer layer (11a) is 30 ⁇ m).
- a multilayer resin sheet having a surface roughness (Ra) of 0.35 ⁇ m was obtained.
- the styrenic resin layer (12b) has a layer structure of 490 ⁇ m, has a thickness of 900 ⁇ m (total thickness of the styrenic resin layer (12a) and the modified olefin polymer layer (11a) is 375 ⁇ m), and the styrenic resin layer (12a) A multilayer resin sheet having a surface roughness (Ra) of 0.28 ⁇ m was obtained.
- the styrenic resin layer (12a) is 165 ⁇ m / s in the same manner as in Example 1 except that a metal roll having a surface roughness (Ra) of 0.1, 0.2, 12, and 15 ⁇ m is used.
- Modified olefin polymer layer (11a) 35 ⁇ m / oxygen barrier resin layer (10) 15 ⁇ m / modified olefin polymer layer (11b) 35 ⁇ m / styrene resin layer (12b) 650 ⁇ m, with a thickness of 900 ⁇ m ( The total thickness of the styrene resin layer (12a) and the modified olefin polymer layer (11a) is 200 ⁇ m), and the surface roughness (Ra) of the styrene resin layer (12a) is 0.04, 0.07, 5. A multilayer resin sheet of 65, 7.60 ⁇ m was obtained.
- the styrenic resin layer (12b) has a layer structure of 360 ⁇ m, and has a thickness of 1000 ⁇ m (total thickness of the styrene resin layer (12a) and the modified olefin polymer layer (11a) is 600 ⁇ m).
- a multilayer resin sheet was obtained in the same manner.
- This multilayer resin sheet was processed in a series of steps from molding, notch formation and container punching (FIG. 4) under the following conditions to obtain the container shown in FIG.
- the notch was formed from the styrene resin layer 12a side, and the depth of the notch was adjusted by the heating temperature of the notch forming portion.
- Equipment used CFF-300 (manufactured by CKD Corporation) Upper heating plate temperature: 170 ° C Lower heating plate temperature: 170 ° C Notch partial heating temperature: 160 ° C Notch depth: 350 ⁇ m
- Container punching blade lower structure female blade Gap between upper and lower sides of container punching blade: 20 ⁇ m
- the surface roughness (Ra) of the sheet was measured by the following method and evaluated according to the following criteria. [Measurement method] JIS B0601 compliant equipment used: Surfcom 120A manufactured by Tokyo Seimitsu Co., Ltd.
- Notch foldability The notch formation part was bent in the bending direction shown in FIG. 3, and evaluated according to the following criteria. ⁇ : Can be broken by bending once. ⁇ : Divided by bending several times. X: It does not crack even if it bends many times.
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Abstract
Description
酸素バリア性樹脂層を構成する酸素バリア性樹脂としては、例えば、エチレン-ビニルアルコール共重合体樹脂、ポリアミド樹脂等が代表的なものとして挙げられる。その中でも、加工性、成形性の面でエチレン-ビニルアルコール共重合体樹脂が好ましい。
変性オレフィン系重合体層を構成する変性オレフィン系重合体としては、エチレン、プロピレン、ブテン-1等の炭素数2~8程度のオレフィンの単独重合体、それらのオレフィンとエチレン、プロピレン、ブテン-1、3-メチルブテン-1、ペンテン-1、4-メチルペンテン-1、ヘキセン-1、オクテン-1、デセン-1等の炭素数2~20程度の他のオレフィンや酢酸ビニル、塩化ビニル、アクリル酸、メタクリル酸、アクリル酸エステル、メタクリル酸エステル、スチレン等のビニル化合物との共重合体等のオレフィン系樹脂や、エチレン-プロピレン共重合体、エチレン-プロピレン-ジエン共重合体、エチレン-ブテン-1共重合体、プロピレン-ブテン-1共重合体等のオレフィン系ゴムを、アクリル酸、メタクリル酸、クロトン酸、イソクロトン酸、マレイン酸、フマル酸、イタコン酸、シトラコン酸、テトラヒドロフタル酸等の不飽和カルボン酸、または、その酸ハライド、アミド、イミド、無水物、エステル等の誘導体、具体的には、塩化マレイル、マレイミド、無水マレイン酸、無水シトラコン酸、マレイン酸モノメチル、マレイン酸ジメチル、マレイン酸グリシジル等でグラフト反応条件下に変性したものが代表的なものとして挙げられる。
スチレン系樹脂層を構成するスチレン系樹脂としては、スチレン、α-メチルスチレン、p-メチルスチレン、ジメチルスチレン、p-t-ブチルスチレン、クロロスチレン等のスチレン系モノマーの単独または共重合体、それらスチレン系モノマーと他のモノマーとの共重合体、例えばスチレン-アクリルニトリル共重合体(AS樹脂)、または、前記スチレン系モノマーとさらに他のポリマー、例えば、ポリブタジエン、スチレン-ブタジエン共重合体、ポリイソプレン、ポリクロロプレン等のジエン系ゴム質重合体の存在下にグラフト重合したグラフト重合体、例えばハイインパクトポリスチレン(HIPS樹脂)、スチレンーアクリルニトリルグラフト重合体(ABS樹脂)等が挙げられる。
ノッチが形成されない面側のスチレン系樹脂層(12b)の露出する表面の表面粗さ(Ra)は特に限定しないが、商品価値の低下を招かないように、0.1μm未満とするのが好ましい。
本発明の一実施形態に係る深絞り成形用熱可塑性多層樹脂シートの層構成は、前述の通り、スチレン系樹脂層/変性オレフィン系重合体層/酸素バリア性樹脂層/変性オレフィン系重合体層/スチレン系樹脂層であるが、他に、例えば、本発明の多層樹脂シートや成形容器の製造工程で発生したスクラップ樹脂の層等を、ノッチが形成される反対側に積層してもよい。
図2及び図3に、本発明の成形容器の一例を示す。
(1)酸素バリア性樹脂層
エチレン-ビニルアルコール共重合体「エバールJ-102B」(クラレ(株)製、エチレン含量32モル%、鹸化度99%以上)
(2)変性オレフィン系重合体層
「モディックF502」(三菱化学社製)
(3)スチレン系樹脂層
HIPS樹脂:「トーヨースチロールH850」(東洋スチレン社製、ブタジエン含量9.0質量%)
GPPS樹脂:「HRM23」(東洋スチレン社製)
2台の40mm単軸押出機と1台の65mm単軸押出機を使用し、フィードブロック法により、スチレン系樹脂層(12a)165μm/変性オレフィン系重合体層(11a)35μm/酸素バリア性樹脂層(10)15μm/変性オレフィン系重合体層(11b)35μm/スチレン系樹脂層(12b)650μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み200μm)で、引取ロールには表面粗さ(Ra)が0.5μmの凹凸加工を施した金属ロールを用いて、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.23μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)40μm/変性オレフィン系重合体層(11a)20μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)20μm/スチレン系樹脂層(12b)800μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み60μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.25μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)285μm/変性オレフィン系重合体層(11a)15μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)15μm/スチレン系樹脂層(12b)665μmという層構成を有し、厚み1000μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み300μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.30μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)30μm/変性オレフィン系重合体層(11a)15μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)15μm/スチレン系樹脂層(12b)820μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み45μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.33μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)325μm/変性オレフィン系重合体層(11a)15μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)15μm/スチレン系樹脂層(12b)525μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み340μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.28μmの多層樹脂シートを得た。
表面粗さ(Ra)が0.3μmの凹凸加工を施した金属ロールを用いた他は実施例1と同様の方法で、スチレン系樹脂層(12a)165μm/変性オレフィン系重合体層(11a)20μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)20μm/スチレン系樹脂層(12b)675μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み185μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.15μmの多層樹脂シートを得た。
表面粗さ(Ra)がそれぞれ2、5、10μmの凹凸加工を施した金属ロールを用いた他は実施例1と同様の方法で、スチレン系樹脂層(12a)165μm/変性オレフィン系重合体層(11a)35μm/酸素バリア性樹脂層(10)15μm/変性オレフィン系重合体層(11b)35μm/スチレン系樹脂層(12b)650μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み200μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)がそれぞれ0.95、2.40、4.70μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)15μm/変性オレフィン系重合体層(11a)15μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)15μm/スチレン系樹脂層(12b)835μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み30μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.35μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)360μm/変性オレフィン系重合体層(11a)15μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)15μm/スチレン系樹脂層(12b)490μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み375μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)が0.28μmの多層樹脂シートを得た。
表面粗さ(Ra)がそれぞれ0.1、0.2、12、15μmの凹凸加工を施した金属ロールを用いた他は実施例1と同様の方法で、スチレン系樹脂層(12a)165μm/変性オレフィン系重合体層(11a)35μm/酸素バリア性樹脂層(10)15μm/変性オレフィン系重合体層(11b)35μm/スチレン系樹脂層(12b)650μmという層構成を有し、厚み900μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み200μm)で、スチレン系樹脂層(12a)の表面粗さ(Ra)がそれぞれ0.04、0.07、5.65、7.60μmの多層樹脂シートを得た。
実施例1と同様の方法で、スチレン系樹脂層(12a)570μm/変性オレフィン系重合体層(11a)30μm/酸素バリア性樹脂層(10)20μm/変性オレフィン系重合体層(11b)20μm/スチレン系樹脂層(12b)360μmという層構成を有し、厚み1000μm(スチレン系樹脂層(12a)と変性オレフィン系重合体層(11a)の合計厚み600μm)で、他の方法は実施例1と同様の方法で多層樹脂シートを得た。
使用機器:CFF-300(CKD株式会社製)
上熱盤温度: 170℃
下熱盤温度: 170℃
ノッチ部分加熱温度:160℃
ノッチ深さ:350μm
容器打ち抜き刃上側構造:雄刃
容器打ち抜き刃下側構造:雌刃
容器打ち抜き刃の上側下側間の間隙:20μm
シートの表面粗さ(Ra)を、以下の方法にて測定し、以下の基準で評価した。
[測定方法] JIS B0601法準拠
使用機器:(株)東京精密社製 サーフコム120A
容器を熱成形する際の成形性を、以下の基準で評価した。
○:成形性良好
×:熱盤付着による成形不良や表面層の破れが確認される。
ノッチ形成部分を、図3に示す折り曲げ方向に折り曲げて、以下の基準で評価した。
○:1度の折り曲げで割れる。
△:数回折り曲げる事で割れる。
×:何度折り曲げても割れない。
成形容器の底面部について表面光沢を測定した。
[評価方法]
測定方法:JIS K7105法準拠
使用機器:日本電色社製 デジタルグロスメーター
[評価基準]
○:光沢度20%以上
×:光沢度20%未満
上記全ての評価結果が○であるものを○、それ以外のものを×とした。
11a,11b 変性オレフィン系重合体層
12a,12b スチレン系樹脂層
Claims (7)
- 酸素バリア性樹脂層の両面に、変性オレフィン系重合体層を介してスチレン系樹脂層が積層されてなり、一方の面側からノッチが形成される深絞り成形用多層樹脂シートであって、前記一方の面側の前記変性オレフィン系重合体層と前記スチレン系樹脂層の厚さの合計が40~350μmであり、かつ、前記スチレン系樹脂層の一方の面の表面粗さ(Ra)が0.1~5.0μmである、深絞り成形用多層樹脂シート。
- 前記酸素バリア性樹脂層が、エチレン-ビニルアルコール共重合体樹脂から形成されてなる、請求項1に記載の深絞り成形用多層樹脂シート。
- 前記変性オレフィン系重合体層の厚みが、10~50μmである、請求項1または2に記載の深絞り成形用多層樹脂シート。
- 前記酸素バリア性樹脂層の厚みが、10~50μmである、請求項1から3のいずれか一項に記載の深絞り成形用多層樹脂シート。
- 前記スチレン系樹脂層が、ブタジエンゴム成分を4~8質量%含有するスチレン系樹脂から形成されてなる、請求項1から4のいずれか一項に記載の深絞り成形用多層樹脂シート。
- 厚みが500~1200μmである、請求項1から5のいずれか一項に記載の深絞り成形用多層樹脂シート。
- 請求項1から6のいずれか一項に記載の深絞り成形用多層樹脂シートを熱成形してなり、前記一方の面側から形成されたノッチを有する、成形容器。
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| WO2017221374A1 (ja) * | 2016-06-23 | 2017-12-28 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
| WO2022131246A1 (ja) * | 2020-12-18 | 2022-06-23 | デンカ株式会社 | 多層樹脂シート、及びそれを成形してなる成形容器 |
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| JPH1180464A (ja) * | 1997-09-01 | 1999-03-26 | Daicel Chem Ind Ltd | 成形用ポリスチレン系シートおよびその製造方法 |
| JP2006051603A (ja) * | 2004-07-14 | 2006-02-23 | Jsp Corp | ポリスチレン系樹脂積層発泡シート |
| JP2008213355A (ja) * | 2007-03-06 | 2008-09-18 | Denki Kagaku Kogyo Kk | 熱可塑性多層樹脂シート及び成形容器 |
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| JPH1158619A (ja) | 1997-08-21 | 1999-03-02 | Mitsubishi Chem Corp | 熱可塑性樹脂多層積層シートおよびそれからなる多層積層容器 |
| JP2006021409A (ja) | 2004-07-07 | 2006-01-26 | Idemitsu Unitech Co Ltd | 積層シート、当該積層シートからなる容器、及び当該容器の製造方法 |
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| JPH1180464A (ja) * | 1997-09-01 | 1999-03-26 | Daicel Chem Ind Ltd | 成形用ポリスチレン系シートおよびその製造方法 |
| JP2006051603A (ja) * | 2004-07-14 | 2006-02-23 | Jsp Corp | ポリスチレン系樹脂積層発泡シート |
| JP2008213355A (ja) * | 2007-03-06 | 2008-09-18 | Denki Kagaku Kogyo Kk | 熱可塑性多層樹脂シート及び成形容器 |
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| WO2017221374A1 (ja) * | 2016-06-23 | 2017-12-28 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
| JPWO2017221374A1 (ja) * | 2016-06-23 | 2019-04-11 | デンカ株式会社 | 多層樹脂シート及び成形容器 |
| WO2022131246A1 (ja) * | 2020-12-18 | 2022-06-23 | デンカ株式会社 | 多層樹脂シート、及びそれを成形してなる成形容器 |
| JPWO2022131246A1 (ja) * | 2020-12-18 | 2022-06-23 | ||
| JP7539490B2 (ja) | 2020-12-18 | 2024-08-23 | デンカ株式会社 | 多層樹脂シート、及びそれを成形してなる成形容器 |
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| JP6225159B2 (ja) | 2017-11-01 |
| KR20150121096A (ko) | 2015-10-28 |
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