Classifications

• • 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
• • 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
  • 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
  • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
  • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
  • B65D85/36—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for bakery products, e.g. biscuits

Definitions

• the present invention relates to a laminated film using a plant-derived raw material and a food packaging bag.
• a resin film using a plant-derived resin for example, a sealant film using a plant-derived linear low-density polyethylene as a sealant film that is laminated with a base material and used for a laminate tube or a standing pouch (Patent Document 1) 2), and a cover material (Patent Document 3) provided with a sealant layer and a base material using plant-derived low-density biomass polyethylene.
• Plant-derived resins are highly environmentally friendly, but often exhibit properties different from those derived from fossil fuels. If simply replaced, heat sealability, impact resistance, bag-breaking resistance, etc. may be reduced. .
• the resin film disclosed in the above document uses a plant-derived resin, but when applied to uses such as a standing pouch and a lid, it is laminated with a laminate base material. No consideration is given to impact resistance, bag breakage resistance and the like in a film configuration without a laminate substrate.
• the resin film disclosed in the above document is mainly composed of an ethylene-based resin.
• ethylene-based resin mainly composed of an ethylene-based resin.
• replacement of a fossil fuel-derived resin with a plant-derived resin is desired. It is rare.
• the problem to be solved by the present invention is to provide a laminated film having suitable seal strength and impact resistance while applying a resin plant-derived component in a film structure mainly composed of a propylene resin.
• the present invention is a laminated film in which a surface layer (A), an intermediate layer (B) and a seal layer (C) are laminated, wherein the surface layer (A), the intermediate layer (B) and the seal layer (C) Contains a propylene-based resin, and the intermediate layer (B) solves the above problems by a laminated film containing plant-derived biomass polyethylene (b1) and fossil fuel-derived polyethylene (b2).
• the laminated film of the present invention can be suitably used as various packaging materials because it has suitable sealing strength and impact resistance while using plant-derived resin.
• it since it has excellent impact resistance even in a configuration in which a laminate base material is not laminated, it can be suitably used as a packaging bag for pillow packaging or gusset packaging.
• the laminated film of the present invention since the laminated film of the present invention has a suitable matte property and excellent fusing strength, it is suitable for use as a gusset packaging bag used for packaging foods such as bread.
• the laminated film of the present invention has at least a surface layer (A), an intermediate layer (B) and a seal layer (C), one surface layer being a surface layer (A) and the other surface layer being a seal layer (C). It is a laminated film.
• the laminated film contains a propylene-based resin in the surface layer (A) and the seal layer (C), and the intermediate layer (B) is a plant-derived biomass polyethylene (b1) fossil fuel-derived polyethylene (b2) and propylene. Contains a block copolymer resin.
• Examples of the propylene resin used as the resin for the surface layer (A) include propylene homopolymers; random copolymers composed of propylene and ethylene, block copolymers composed of propylene and ethylene, and other than propylene and ethylene. And a propylene resin such as a copolymer with an ⁇ -olefin. These propylene resins may be used alone or in combination of two or more. Matte laminate having suitable impact resistance and friction resistance as well as high rigidity and excellent design by including a propylene resin, preferably a propylene block copolymer resin, in the surface layer (A) It can be a film.
• the content of the propylene-based resin in the resin component contained in the surface layer (A) is preferably 50% by mass or more and 70% by mass or more because it is easy to obtain suitable fusing strength and bag-making suitability. More preferably, it is more preferably 90% by mass or more.
• the resin component contained in the surface layer (A) may be a surface layer substantially composed of only a propylene-based resin.
• a propylene-based block copolymer resin that can be preferably used as a propylene-based resin
• a copolymer of propylene and another ⁇ -olefin can be used.
• ⁇ -olefins include ethylene, 1-butene, 1-hexene, 4-methyl / 1-pentene, 1-octene, and the like because ethylene has an excellent matte feeling, cold resistance and rigidity balance.
• the ⁇ -olefin content in the propylene-based block copolymer is preferably 2 to 10% by mass, more preferably 4 to 8% by mass because it is easy to obtain impact resistance and rigidity.
• the melt flow rate (MFR) of the propylene-based block copolymer resin is preferably 0.5 g / 10 min or more, since it is easy to mold and easily obtains suitable impact resistance and mat feeling. More preferably, it is 1 g / 10 minutes or more. Moreover, it is preferable that it is 20 g / 10min or less, and it is more preferable that it is 10 g / 10min or less.
• the melting point of the propylene-based block copolymer resin is preferably 155 ° C. or higher, and preferably 165 ° C. or lower because it is easy to obtain suitable bag-making properties.
• the propylene block copolymer resin used for the surface layer (A) may be a single copolymer or a plurality of copolymers. When using two or more, it is preferable to make the total content of the propylene-type block copolymer resin to be used into the following range.
• BC8, BC7 (manufactured by Nippon Polypro Co., Ltd.), E150GK, F704V (Prime) are used in the surface layer (A) and have a good balance with mat feeling, fusing strength and bag making suitability.
• Polymer PC480A, PC684S, PC380A, VB370A (manufactured by Sun Allomer), and the like.
• the content of the propylene-based block copolymer in the resin component contained in the surface layer (A) depends on mat feeling, fusing strength, and bag-making suitability.
• the content of the resin component used in the surface layer (A) is preferably 50% by mass or more, more preferably 70% by mass or more. By setting it as the said range, it becomes easy to obtain the uniform mat feeling excellent in the designability.
• the content is preferably 80 to 100% by mass, and when the mat feeling is improved, the content is preferably 70 to 90% by mass.
• various olefin resins used for the packaging film can be used in addition to the propylene resin described above.
• examples of such resins include propylene homopolymer, propylene- ⁇ -olefin random copolymer (propylene-ethylene copolymer, propylene-butene-1 copolymer, propylene-ethylene-butene-1 copolymer).
• Polypropylene resins such as metallocene catalyst polypropylene
• polyethylene resins such as very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), and low density polyethylene (LDPE), and ethylene-vinyl acetate copolymers (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate (EMA) copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer ( E-EA-MAH), ethylene Ethylene copolymers such as crylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA); further, ionomers of ethylene-acrylic acid copolymers, ionomers of ethylene-methacrylic acid copolymers, etc. Resin can be used.
• VLDPE very low density polyethylene
• LLDPE linear low density
• additives may be blended in the surface layer (A) as long as the effects of the present invention are not impaired.
• the additive include an antioxidant, a weather resistance stabilizer, an antistatic agent, an antifogging agent, an antiblocking agent, a lubricant, a nucleating agent, and a pigment.
• the surface roughness (Ra) of the surface layer (A) based on JIS B-0601 is preferably 0.2 to 1.0, and more preferably 0.3 to 0.7.
• the amount of other components additive such as slip agents and antiblocking agents
• a film with excellent surface slipperiness can be obtained.
• the speed of bag making is improved, the associating after bag making and the improvement and efficiency of packing work are improved, and the workability at the time of packing by the automatic packing machine after filling the contents is improved.
• the friction coefficient (ASTM D-1894) of the surface layer (A) is preferably 0.05 to 0.7, more preferably 0.07 to 0.6, and more preferably 0.1 to 0.5. By setting it as the said range, it becomes easy to improve the film feeding property at the time of packaging, the alignment property after bag making, packing workability
• the friction coefficient can be adjusted by appropriately adding additives such as a lubricant and an anti-blocking agent according to the resin component used for the surface layer.
• the intermediate layer of the laminated film of the present invention is a layer containing plant-derived biomass polyethylene (b1), fossil fuel-derived polyethylene (b2), and propylene-based block copolymer resin (b3).
• the laminated film has excellent matting properties, excellent bag breaking resistance, particularly excellent bag breaking resistance and friction resistance at low temperatures, while having excellent environmental compatibility. Can be obtained.
• the plant-derived biomass polyethylene (b1) used for the intermediate layer (B) is a polyethylene-based resin produced from plant-derived ethylene starting from sugarcane, corn, beet or the like.
• the biomass polyethylene (b1) include linear low density polyethylene (LLDPE), linear medium density polyethylene (LMDPE), linear high density polyethylene (LHDPE), low density polyethylene (LDPE), and medium density polyethylene (MDPE). ), High density polyethylene (HDPE), and the like. These may be used alone or in combination of two or more.
• linear low density polyethylene is particularly preferable.
• the linear low density Porieren preferably density of 0.925 g / cm 3 or less, more preferably 0.920 g / cm 3 or less.
• the MFR of the biomass polyethylene (b1) used for the intermediate layer (B) is preferably from 0.1 to 30 g / 10 minutes, particularly preferably from 0.5 to 20 g / 10 minutes. By setting it as 1 g / 10min or more, it becomes easy to obtain suitable film forming property, and it becomes easy to obtain suitable moldability by setting it as 20 g / 10 minutes or less.
• Biomass polyethylene (b1) used for the intermediate layer (B) is a plant such as sugar cane, and the production method is the same except for the production of monomers, although the raw material is a plant such as sugar cane.
• a manufacturing method It can manufacture by the well-known method. For example, a production method using a Ziegler-Natta catalyst or a metallocene catalyst can be raised.
• a catalyst system in which a titanium-containing compound itself or a titanium-containing compound supported on a carrier such as a magnesium compound is used as a main catalyst and an organoaluminum compound is used as a co-catalyst, propylene alone or a desired ⁇ such as ethylene -A method of carrying out polymerization by adding an olefin can be mentioned.
• This polymerization may be any process such as a slurry polymerization method, a solution polymerization method, and a gas phase polymerization method.
• a homogeneous catalyst may be used, and a conventionally used catalyst composed of a vanadium compound and an organoaluminum compound, or a cyclopentadienyl group, a substituted cyclopentadienyl group, an indenyl group, a substituted indenyl group, etc.
• a metallocene system comprising a transition metal compound such as zirconium, titanium or hafnium having one or two ligands, a transition metal compound in which the ligand is geometrically controlled, and a promoter such as an aluminoxane or an ionic compound. Mention may also be made of homogeneous catalyst systems such as catalysts.
• the metallocene catalyst may be any process such as a slurry polymerization method and a gas phase polymerization method in addition to homogeneous polymerization in the presence of a solvent, if necessary, using an organoaluminum compound.
• biomass polyethylene (b1) examples include SLL118, SLL118 / 21, SLL218, SLL318, SLH118, SLH218, SLH0820 / 30AF, SBC818, SPB208, STN7006, SEB853, etc. manufactured by Braschem.
• the fossil fuel-derived polyethylene (b2) used for the intermediate layer (B) is a polyethylene-based resin made from fossil fuels such as petroleum.
• Examples of the polyethylene (b2) include linear low density polyethylene (LLDPE), linear medium density polyethylene (LMDPE), linear high density polyethylene (LHDPE), low density polyethylene (LDPE), and medium density polyethylene (MDPE).
• Polyethylene resin such as high density polyethylene (HDPE), ethylene-butene-rubber copolymer (EBR), ethylene-propylene-rubber copolymer (EPR), ethylene-vinyl acetate copolymer (EVA), ethylene -Methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate (EMA) copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH) ), Ethylene-acrylic acid copolymer (EAA), Ethylene copolymers such as lene-methacrylic acid copolymer (EMAA); and ethylene-acrylic acid copolymer ionomers, ethylene-methacrylic acid copolymer ionomers, and the like.
• HDPE high density polyethylene
• EBR ethylene-butene-rubber copolymer
• linear low density polyethylene is preferable.
• the linear low density Porieren preferably density of 0.915 g / cm 3 or less, more preferably 0.910 g / cm 3 or less, still be at 0.906 g / cm 3 or less preferable.
• density of the linear low-density polyethylene By setting the density of the linear low-density polyethylene to be used within the above range, it is easy to combine suitable fusing strength, high impact resistance, and bag breaking resistance.
• One kind of linear low density polyethylene may be used, or a plurality of kinds may be used in combination.
• the MFR (190 ° C., 21.18N) of the linear low density polyethylene is preferably 10 g / 10 minutes or less, more preferably 1 to 5 g / 10 minutes.
• the same propylene-based block copolymer resin used for the surface layer can be preferably used.
• the propylene-based block copolymer may be a single copolymer or a plurality of copolymers.
• the mass is preferably from 35% by mass to 35% by mass, and more preferably from 2% by mass to 25% by mass.
• the content is more preferably 5% by mass or more, and particularly preferably 10% by mass or more.
• 20 mass% or less is further more preferable, and it is especially preferable that it is 15 mass% or less.
• the content of polyethylene (b2) derived from fossil fuel in the resin component contained in the intermediate layer (B) is 3% by mass or more because it is easy to obtain suitable bag making suitability, fusing seal strength, and bag breaking resistance.
• it is 5 mass% or more, more preferably 7 mass% or more.
• it is preferable that it is 30 mass% or less, It is more preferable that it is 20 mass% or less, It is further more preferable that it is 15 mass% or less.
• the content of the propylene-based block copolymer (b3) in the resin component contained in the intermediate layer (B) is preferably 95% by mass or less because it is easy to obtain suitable impact resistance and mat feeling, 85 It is more preferably no greater than mass%, more preferably no greater than 80 mass%, and particularly preferably no greater than 75 mass%. Moreover, since it is easy to obtain the stability at the time of a bag making, it is preferable that it is 15 mass% or more, It is more preferable that it is 20 mass% or more, It is more preferable that it is 25 mass% or more, 30 mass % Or more is particularly preferable.
• biomass polyethylene (b1) fossil fuel-derived polyethylene (b2) and propylene-based block copolymer (b3)
• Content ratio biomass polyethylene (b1) / fossil fuel-derived polyethylene (b2) / propylene block copolymer (b3)) is 2/3/95 to 30/25/45 by mass ratio Is preferably 10/5/85 to 25/20/55.
• resins other than those described above for example, olefinic resins as described above may be used in combination, and among them, propylene- ⁇ -olefin random copolymers can be preferably used, particularly propylene-ethylene.
• a random copolymer can be preferably used.
• the content of ⁇ -olefin such as ethylene, butene-1,4-methylpentene-1, and octene-1 in the propylene- ⁇ -olefin random copolymer is preferably 0.3 to 10% by mass. More preferably, the content is 5 to 6% by mass.
• ⁇ -olefin content By setting the ⁇ -olefin content in the above range, it is easy to obtain suitable rigidity and blocking resistance, and it becomes easy to realize suitable bag making aptitude and packaging aptitude.
• the content of ⁇ -olefin such as ethylene is measured by an infrared absorption spectrum method.
• the melt flow rate (MFR) of the propylene-ethylene random copolymer in the intermediate layer (B) is not particularly limited as long as it can form a laminated film, but is preferably 0.5 g / 10 min or more, It is more preferably 3 g / 10 minutes or more, and more preferably 5 g / 10 minutes or more.
• the MFR is preferably 20 g / 10 min or less, more preferably 15 g / 10 min or less, and more preferably 12 g / 10 min or less.
• Propylene - density of the ethylene random copolymer more it is preferably at most 0.880 g / cm 3 or more 0.905 g / cm 3, is 0.890 g / cm 3 or more 0.900 g / cm 3 or less preferable.
• the melting point of the propylene-ethylene random copolymer is preferably 110 ° C. or higher, and more preferably 115 ° C. or higher, from the viewpoint of preventing adhesion to the fusing seal blade during bag making.
• it is preferably 150 ° C. or less, more preferably 145 ° C. or less.
• the content of the propylene- ⁇ -olefin random copolymer in the resin component contained in the intermediate layer (B) is 5 It is preferably at least mass%, more preferably at least 15 mass%, and even more preferably at least 25 mass%. Moreover, it is preferable to set it as 50 mass% or less, It is more preferable to set it as 45 mass% or less, It is further more preferable to set it as 40 mass% or less.
• the resin component contained in the intermediate layer (B) may be any of the above-mentioned various resins, but it is easy to suppress deterioration of rigidity and impact strength when the total thickness of the laminated film is designed to be thin. Therefore, it is preferable that the content of the propylene resin in the resin component contained in the intermediate layer (B) is 55% by mass or more and the content of the ethylene resin is 7 to 45% by mass.
• propylene block copolymer (b3) and propylene-ethylene random copolymer are used as the propylene resin, and the total amount of these is 55% by mass or more.
• the ethylene resin plant-derived biomass is used. It is particularly preferable that polyethylene (b1) and fossil fuel-derived polyethylene (b2) are used and the total amount thereof is 7 to 45% by mass.
• biomass polyethylene (b1) the fossil fuel-derived polyethylene (b2), the propylene-based block copolymer (b3) and the propylene-ethylene random copolymer are used as the resin component contained in the intermediate layer (B).
• the ratio of these contents is 2/3 / by mass. 65/30 to 25/20/15/40 is preferable, and 10/5/50/35 to 15/15/30/40 is more preferable.
• the sealing layer (C) used for this invention is a layer used for adhesion
• species from which the suitable sealing strength is obtained for the said sealing layer according to a use aspect or to-be-sealed object For example, when used as a packaging bag by sealing the seal layers, propylene- ⁇ - such as propylene-ethylene random copolymer, propylene-1-butene copolymer, etc. is obtained from the point that an appropriate seal strength can be obtained.
• a seal layer containing an ⁇ -olefin-propylene copolymer such as an olefin copolymer or 1-butene-propylene copolymer can be suitably used.
• propylene-1-butene is easy to adjust heat seal temperature and strength at easy opening seal at low temperature, wide heat seal temperature range, and easy to obtain appropriate heat seal strength as easy open seal.
• a butene-based resin such as a polymer or a 1-butene-propylene copolymer is preferred.
• the 1-butene content in the copolymer is 60%. It is preferably ⁇ 95 mol%, more preferably 65 to 95%, and even more preferably 70 to 90 mol%.
• the propylene content is preferably 2 to 10% by mole, more preferably 3 to 9% by mole, and further preferably 4 to 8% by mole because a suitable low-temperature sealability is easily obtained. preferable.
• the content of butene resin is 50% by mass or less in the resin component contained in the seal layer.
• it is 40 mass% or less, more preferably 30 mass% or less.
• it is preferable to set it as 10 mass% or more, and it is more preferable to set it as 15 mass% or more.
• the content of the butene-based resin is within this range, it is easy to obtain suitable low-temperature sealing properties, fusing strength and tear resistance of bag-made products, and it is advantageous for cost reduction.
• polystyrene-based resins As the resin used in combination with the butene-based resin, other polyolefin-based resins can be used as appropriate. However, since the seal strength is easily adjusted, a propylene- ⁇ -olefin copolymer or an ethylene- ⁇ -olefin copolymer can be used. Polymers can be preferably used, and propylene- ⁇ -olefin copolymers can be particularly preferably used.
• the ⁇ -olefin content in the propylene- ⁇ -olefin copolymer is not particularly limited, but is preferably 1 to 20% by mass, more preferably 1.5 to 15% by mass.
• Examples of the ⁇ -olefin include ethylene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.
• propylene-ethylene random copolymers as exemplified in the intermediate layer can be preferably used.
• the MFR is preferably from 0.5 to 20 g / 10 minutes, more preferably from 2 to 10 g / 10 minutes, since good moldability is easily obtained.
• the content of the other olefinic resin is preferably 90% by mass or less, more preferably 85% by mass or less in the resin component contained in the seal layer, because it is easy to obtain suitable low-temperature sealing properties. . Moreover, it is preferable to set it as 50 mass% or more, and it is more preferable to set it as 60 mass% or more.
• a butene-based resin and a propylene- ⁇ -olefin copolymer when providing an easy-opening part in which the sealing layers are heat-sealed, a butene-based resin and a propylene- ⁇ -olefin copolymer, It is preferable to use in combination at a ratio such that the mass ratio represented by the butene resin / propylene- ⁇ -olefin copolymer is 20/80 to 50/50.
• various additives may be blended within a range not impairing the effects of the present invention.
• the additive include an antioxidant, a weather resistance stabilizer, an antistatic agent, an antifogging agent, an antiblocking agent, a lubricant, a nucleating agent, and a pigment.
• the friction coefficient (ASTM D1894) of the seal layer (C) surface is preferably 0.01 to 0.4, more preferably 0.02 to 0.35, and more preferably 0.05 to 0.30. By setting it as the said range, it becomes easy to improve the packaging work by the film feedability at the time of packaging, the wrinkle after bag making, and suppression of swell. In addition, it is easy to suppress scratches caused by rubbing between the contents when filling the contents such as bread and the film inner surface, and to improve wear resistance and tear resistance, and to easily suppress film tearing.
• the friction coefficient can be adjusted by appropriately adding additives such as a lubricant and an anti-blocking agent according to the resin component used for the seal layer.
• the laminated film of the present invention is a laminated film having at least the above-mentioned surface layer, intermediate layer and seal layer, and is a laminated film in which one surface layer of the laminated film is a surface layer and the other surface layer is a seal layer.
• the laminated film having such a configuration can be suitably used as a film for various packaging because it has a suitable fusing seal strength and is excellent in impact resistance and bag breaking resistance.
• the thickness of the laminated film of the present invention may be appropriately adjusted according to the use and mode to be used.
• the total thickness is 20 because it is easy to achieve both volume reduction in packaging applications and resistance to bag breakage during distribution. It is preferably ⁇ 60 ⁇ m, more preferably 25 ⁇ 50 ⁇ m.
• each layer are not particularly limited, but for example, the thickness of the surface layer is preferably 2 to 20 ⁇ m, and more preferably 3 to 15 ⁇ m.
• the thickness of the intermediate layer is preferably 3 to 30 ⁇ m, more preferably 5 to 20 ⁇ m.
• the thickness of the seal layer is preferably 1 to 10 ⁇ m, and more preferably 2 to 8 ⁇ m.
• the thickness ratio of the surface layer is preferably 15% or more, more preferably 20% or more of the total thickness of the laminated film, because it is easy to obtain a suitable matte feeling, fusing strength and bag-making suitability. . Moreover, it is preferable to set it as 40% or less, and it is more preferable to set it as 35% or less.
• the thickness ratio of the intermediate layer is preferably 30% or more, more preferably 40% or more of the total thickness of the laminated film because it is easy to obtain suitable matte feeling, fusing strength, and bag-making suitability. Moreover, it is preferable to set it as 70% or less, and it is more preferable to set it as 65% or less.
• the thickness ratio of the seal layer is preferably 5% to 30%, more preferably 10 to 25% of the total thickness of the laminated film, since it is easy to obtain suitable easy-openability, fusing strength, and bag-making suitability.
• the content of plant-derived biomass polyethylene in the resin component contained in the entire laminated film is preferably 2% by mass or more from the viewpoint of reducing environmental burden, and is 3% by mass or more. Is more preferable, and it is more preferable that it is 5 mass% or more.
• the haze of the laminated film of the present invention is preferably 35% or more, and more preferably 55% or more because it is easy to obtain a suitable matte design. Moreover, when ensuring the visibility of the contents, the haze is preferably 80% or less, and more preferably 70% or less.
• the laminated film of the present invention may be laminated with any other resin layer other than the surface layer, intermediate layer and seal layer, but the thickness of the other resin layer is 20% or less of the total thickness.
• the structure composed of the surface layer, the intermediate layer, and the seal layer is particularly preferable. In this configuration, an intermediate layer in which a plurality of intermediate layers are stacked may be used.
• the layer structure include a three-layer structure of surface layer / intermediate layer / sealing layer in which an intermediate layer is provided between the surface layer and the seal layer, or a surface layer in which the intermediate layer is composed of a plurality of layers.
• Preferred examples include: / intermediate layer 1 / intermediate layer 2 / four-layer structure of seal layer.
• the 3 layer structure which consists of a surface layer / intermediate layer / sealing layer can be used preferably.
• the resin or resin mixture used for each layer is heat-melted with a respectively separate extruder,
• methods such as a coextrusion multilayer die method and a feed block method, etc.
• coextrusion method in which a film is laminated in a molten state and then formed into a film by inflation, a T-die / chill roll method, or the like.
• This co-extrusion method is preferable because the thickness ratio of each layer can be adjusted relatively freely, and a laminated film having excellent hygiene and cost performance can be obtained. Since the laminated film obtained by the manufacturing method is obtained as a substantially unstretched laminated film, secondary molding such as deep drawing by vacuum molding is also possible.
• the surface layer is preferably subjected to a surface treatment in order to improve adhesion with printing ink.
• a surface treatment examples include corona treatment, plasma treatment, chromic acid treatment, flame treatment, hot air treatment, surface oxidation treatment such as ozone / ultraviolet treatment, and surface unevenness treatment such as sandblasting. Corona treatment is preferable.
• Examples of the packaging material made of the laminated film of the present invention include packaging bags, containers, container lids and the like used for foods, medicines, industrial parts, miscellaneous goods, magazines and the like.
• the sealing layer of the laminated film of the present invention is used as a heat sealing layer, the sealing layers are overlapped and heat sealed, or the surface layer and the sealing layer are overlapped and heat sealed, so that the sealing layer is the inner side.
• a formed packaging bag is preferred. For example, after cutting the two laminated films into the desired size of the packaging bag, overlapping them and heat-sealing the three sides to form a bag, filling the contents from one side that is not heat-sealed It can be used as a packaging bag by heat sealing. Furthermore, it is also possible to form a packaging bag by sealing the upper and lower sides after sealing the end of a roll-shaped film into a cylindrical shape by an automatic packaging machine.
• the packaging bag for bread when it is set as the packaging bag for bread, it can be set as the packaging bag which has a gusset part by folding and sealing a printing surface. Specifically, it is processed into a bottom gusset bag by a bag making machine such as HK-40 manufactured by Totani Giken Kogyo Co., Ltd. so that the sealing layer of the laminated film of the present invention is inside the bag. Since the laminated film of the present invention can realize suitable fusing strength and bag making suitability, it can be particularly suitably used as a bottom gusset bag.
• the fusing seal temperature and the bag making speed are adjusted so that the fusing seal strength of the side part of the bottom gusset bag and the bottom gusset part (folded part of the bottom part) is 7.5 N to 30 N / 15 mm, preferably 10 to 30 N / 15 mm. It is preferable.
• the obtained bottom gusset bag is supplied to a bread bread automatic filling machine, and after filling bread, is easy to open and has a heat seal strength of 0.1 to 5 N / 15 mm, preferably 0.2 to 4 N / 15 mm.
• the horizontal pillow type automatic packaging machine such as FW-3400 ⁇ V type manufactured by Fujikikai Co., Ltd. so that the seal layer is inside the bag. Supplied in roll form.
• the heat seal surfaces of the film are overlapped and heat sealed to form a bag and to enclose the bread.
• it is preferable to adjust the heat sealing temperature and the packaging speed so that the sealing strength of the bottom portion and the back pasting portion of the pillow packaging bag by the packaging machine is 7.5 N to 30 N / 15 mm, preferably 8 to 20 N / 15 mm. .
• an easily openable seal portion may be formed by heat sealing under conditions that allow easy opening and a heat seal strength of 0.1 to 5 N / 15 mm, preferably 0.2 to 4 N / 15 mm. May be bound using a binding tool such as a plastic plate, tape, or string.
• a packaging bag, a container, and a container lid by heat-sealing another film that can be heat-sealed with a sealing layer.
• a film such as LDPE, EVA, or polypropylene having relatively low mechanical strength can be used.
• a laminate film in which a film of LDPE, EVA, polypropylene, etc., and a stretched film having relatively good tearability for example, a biaxially stretched polyethylene terephthalate film (OPET), a biaxially stretched polypropylene film (OPP), etc. are bonded together.
• OPET biaxially stretched polyethylene terephthalate film
• OPP biaxially stretched polypropylene film
• the laminated film of the present invention can realize suitable impact resistance and bag breaking resistance, it can be suitably applied to various packaging applications.
• excellent impact resistance can be realized even at low temperatures, it is suitable for food packaging applications that are often packaged and distributed at low temperatures.
• the laminated film of the present invention when the laminated film of the present invention is applied to bread packaging such as bread and confectionery bread in which a binding tool (closure) having a sharp tip portion and a heel portion is used, it is difficult for bag breakage at the time of binding to occur, In addition, even when contact with the binding tool or the transport container occurs during transfer, pinholes and tears are unlikely to occur. In addition, it is difficult to cause pinholes and tears due to rubbing between the food as the contents and the inner surface of the film (seal surface), friction between the mixed plastic tray and piercing. Furthermore, since the laminated film of the present invention can ensure a suitable fusing seal strength even when a gusset portion is formed, it can be particularly suitably applied to bread packaging applications.
• Example 1 A resin mixture for forming each layer was prepared by using the following resins as resin components for forming each layer of the surface layer, the intermediate layer, and the seal layer. Each of these mixtures was supplied to three extruders and coextruded so that the average thickness of each layer of the laminated film formed by the surface layer / intermediate layer / sealing layer was 7/18/5 ⁇ m. A 30 ⁇ m laminated film was formed. Subsequently, the surface layer of the obtained laminated film was subjected to a corona discharge treatment so that the surface energy was 35 mN / m to obtain a laminated film.
• propylene-ethylene block copolymer resin propylene-derived component content: 90% by mass, density: 0.90 g / cm 3 , MFR (measuring temperature 230 ° C.): 5 g / 10 min) (hereinafter referred to as propylene block copolymer) 100 parts by mass of polymer (referred to as polymer (1))
• propylene block copolymer 100 parts by mass of polymer (referred to as polymer (1))
• propylene-ethylene block copolymer (density: 0.90 g / cm 3 , MI: 8 g / 10 minutes, melting point 160 ° C.) (hereinafter referred to as propylene block copolymer) 40 parts by mass of a copolymer (referred to as (2)), a propylene-ethylene random copolymer (ethylene content: 5.2%, density: 0.90 g / cm 3 , MFR: 5.4 g / 10 minutes) (hereinafter referred to as COPP ( 1) and referred to
• Example 2 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer propylene block copolymer (2) 42 parts by mass, COPP (1) 35 parts by mass, LLDPE (1) 3 parts by mass, bio PE (1) 20 parts by mass
• Example 3 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 45 parts by mass of propylene-based block copolymer (2), 35 parts by mass of COPP (1), 15 parts by mass of LLDPE (1), 5 parts by mass of bio PE (1)
• Example 4 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 45 parts by mass of propylene-based block copolymer (2), 40 parts by mass of COPP (1), 13 parts by mass of LLDPE (1), 2 parts by mass of bio PE (1)
• Example 5 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer propylene block copolymer (2) 35 parts by mass, COPP (1) 35 parts by mass, LLDPE (1) 5 parts by mass, bio PE (1) 25 parts by mass
• Example 6 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows. Intermediate layer: 75 parts by mass of propylene-based block copolymer (2), 10 parts by mass of LLDPE (1), 15 parts by mass of bio PE (1)
• Example 7 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 72 parts by mass of propylene-based block copolymer (2), 3 parts by mass of LLDPE (1), 25 parts by mass of bio PE (1)
• Example 8 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 75 parts by mass of propylene-based block copolymer (2), 15 parts by mass of LLDPE (1), 10 parts by mass of bio PE (1)
• Example 9 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 65 parts by mass of propylene-based block copolymer (2), 10 parts by mass of LLDPE (1), 25 parts by mass of bio PE (1)
• Example 10 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 65 parts by mass of propylene-based block copolymer (2), 20 parts by mass of LLDPE (1), 15 parts by mass of bio PE (1)
• Example 1 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer 55 parts by mass of propylene-based block copolymer (2), 5 parts by mass of LLDPE (1), 40 parts by mass of bio PE (1)
• Comparative Example 2 A laminated film was obtained in the same manner as in Example 1 except that the resin component of the resin mixture used for the intermediate layer was as follows.
• Intermediate layer propylene homopolymer (density: 0.90 g / cm 3, MFR: 8 g / 10 min) (hereinafter referred to as HOPP (1)) 85 parts by mass, bio PE (1) 15 parts by mass
• ⁇ The film follows the bag even at a bag-making speed of 120 shots, and there is no problem with the alignment.
• ⁇ The film follows the bag-making speed at 120 shots, but the alignment property becomes a problem. There are things that can not follow the bag speed, poor alignment
• bottom gusset bags were produced in the same manner as in the bag-making suitability evaluation. From the center of the gusset portion on both sides of the obtained five bottom gusset bags and the center of the side portion other than the gusset, respectively, a test piece having a length of 70 mm and a width of 15 mm is set so that the fusing seal portion is the center portion in the length direction. 10 sheets were cut out each, and the maximum load at the time of pulling with a Tensilon tensile tester (manufactured by A & D Co., Ltd.) at 23 ° C.
• the fusing strength of the gusset part and the side part is 15 N / 15 mm or more.
• the fusing strength of the gusset part and the side part is both 12 N / 15 mm and less than 15 N / 15 mm.
• X At least one fusing of the gusset part and the side part. Strength is less than 12N / 15mm
• the laminated films of the present invention of Examples 1 to 10 have favorable matte appearance, suitable seal strength, impact resistance, and friction resistance, and excellent bag breaking resistance. It was a thing.
• the laminated films of Comparative Examples 1 and 2 were unable to combine suitable impact resistance and fusing seal strength.

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• 2018
  • 2018-02-21 TW TW107105711A patent/TW201834862A/zh unknown
  • 2018-02-22 JP JP2019504460A patent/JP7140104B2/ja active Active
  • 2018-02-22 WO PCT/JP2018/006387 patent/WO2018163835A1/ja active Application Filing

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