CN106132701A - 包装薄膜 - Google Patents
包装薄膜 Download PDFInfo
- Publication number
- CN106132701A CN106132701A CN201580014101.7A CN201580014101A CN106132701A CN 106132701 A CN106132701 A CN 106132701A CN 201580014101 A CN201580014101 A CN 201580014101A CN 106132701 A CN106132701 A CN 106132701A
- Authority
- CN
- China
- Prior art keywords
- plastic sheeting
- packing film
- film
- layer
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012856 packing Methods 0.000 title claims abstract description 39
- 229920003023 plastic Polymers 0.000 claims abstract description 46
- 239000004033 plastic Substances 0.000 claims abstract description 46
- 239000002985 plastic film Substances 0.000 claims abstract description 16
- 229920006255 plastic film Polymers 0.000 claims abstract description 15
- 229920000098 polyolefin Polymers 0.000 claims abstract description 10
- 239000010408 film Substances 0.000 claims description 46
- -1 polyethylene Polymers 0.000 claims description 44
- 239000000203 mixture Substances 0.000 claims description 31
- 239000004952 Polyamide Substances 0.000 claims description 22
- 229920002647 polyamide Polymers 0.000 claims description 22
- 229920001577 copolymer Polymers 0.000 claims description 21
- 229920000642 polymer Polymers 0.000 claims description 20
- 229920001296 polysiloxane Polymers 0.000 claims description 18
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 238000004806 packaging method and process Methods 0.000 claims description 14
- 239000010409 thin film Substances 0.000 claims description 14
- 239000004698 Polyethylene Substances 0.000 claims description 12
- 230000004888 barrier function Effects 0.000 claims description 12
- 239000004701 medium-density polyethylene Substances 0.000 claims description 12
- 229920000573 polyethylene Polymers 0.000 claims description 12
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 claims description 11
- 239000002318 adhesion promoter Substances 0.000 claims description 11
- 239000004702 low-density polyethylene Substances 0.000 claims description 11
- 229920001179 medium density polyethylene Polymers 0.000 claims description 11
- 229920001684 low density polyethylene Polymers 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 125000001931 aliphatic group Chemical group 0.000 claims description 7
- 125000003118 aryl group Chemical group 0.000 claims description 7
- 238000004049 embossing Methods 0.000 claims description 7
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229920000728 polyester Polymers 0.000 claims description 7
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 claims description 6
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 4
- 206010021639 Incontinence Diseases 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 230000036541 health Effects 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical group OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 2
- 239000002650 laminated plastic Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 235000013599 spices Nutrition 0.000 claims description 2
- 239000004953 Aliphatic polyamide Substances 0.000 claims 1
- 229920003231 aliphatic polyamide Polymers 0.000 claims 1
- 229920006147 copolyamide elastomer Polymers 0.000 claims 1
- 150000002894 organic compounds Chemical class 0.000 claims 1
- 239000010410 layer Substances 0.000 description 75
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 10
- 238000007711 solidification Methods 0.000 description 10
- 230000008023 solidification Effects 0.000 description 10
- 239000000654 additive Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 description 9
- 239000005020 polyethylene terephthalate Substances 0.000 description 9
- 230000000996 additive effect Effects 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 150000001721 carbon Chemical group 0.000 description 6
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 5
- 229910018557 Si O Inorganic materials 0.000 description 5
- 150000001336 alkenes Chemical class 0.000 description 5
- 229920006017 homo-polyamide Polymers 0.000 description 5
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 5
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 229920001519 homopolymer Polymers 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 229920001634 Copolyester Polymers 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000013007 heat curing Methods 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 229920002367 Polyisobutene Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000001913 cellulose Chemical class 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007766 curtain coating Methods 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 2
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 2
- 229920002457 flexible plastic Polymers 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000006187 pill Substances 0.000 description 2
- 229920001083 polybutene Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229920002397 thermoplastic olefin Polymers 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- JJTUDXZGHPGLLC-IMJSIDKUSA-N 4511-42-6 Chemical compound C[C@@H]1OC(=O)[C@H](C)OC1=O JJTUDXZGHPGLLC-IMJSIDKUSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010008190 Cerebrovascular accident Diseases 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 208000006011 Stroke Diseases 0.000 description 1
- 229920008262 Thermoplastic starch Polymers 0.000 description 1
- 239000012963 UV stabilizer Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000008064 anhydrides Chemical group 0.000 description 1
- 230000000845 anti-microbial effect Effects 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- 125000004429 atom Chemical class 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- VYQRBKCKQCRYEE-UHFFFAOYSA-N ctk1a7239 Chemical compound C12=CC=CC=C2N2CC=CC3=NC=CC1=C32 VYQRBKCKQCRYEE-UHFFFAOYSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006459 hydrosilylation reaction Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 1
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920006123 polyhexamethylene isophthalamide Polymers 0.000 description 1
- 229920000903 polyhydroxyalkanoate Polymers 0.000 description 1
- 239000013047 polymeric layer Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 229920006024 semi-aromatic copolyamide Polymers 0.000 description 1
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000004628 starch-based polymer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B65D65/02—Wrappers or flexible covers
- B65D65/14—Wrappers or flexible covers with areas coated with adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
-
- 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
-
- 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
- B32B1/08—Tubular products
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- 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
-
- 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
- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明涉及包装薄膜,其包含具有≤18μm,优选≤12μm的总厚度的多层塑料薄膜,该塑料薄膜至少单轴拉伸,由至少50重量%的聚烯烃组成且根据DIN EN ISO 527‑3在至少3 N/25 mm宽度的拉力下具有最大1%的伸长率。
Description
本发明涉及包装薄膜,其包含至少单轴拉伸的多层柔性塑料薄膜,该塑料薄膜具有≤ 18 μm,优选≤ 12 μm的总厚度,根据DIN EN ISO 527-3在至少3 N/25 mm宽度的拉力下具有最多1%的伸长率,和涉及由其制成的用于优选独立包装的卫生产品或独立包装的失禁产品的包装。
已知所述塑料薄膜用于多种应用中,其中所述塑料薄膜作为包装材料的使用占总使用中相当大的比例。例如,特别是在卫生领域,由于该类卫生制品如卫生护垫或卫生巾以及失禁制品越来越多地独立包装,可以看出包装用于一次性使用的卫生制品的趋势日益上升。因此,对相应包装材料的需求也日益上升。由于该类包装材料几乎不可再循环因此不可用于重复使用,越来越多尝试的是,尽可能少地将化石资源用于这些包装材料。这意味着,对于作为包装材料的相应塑料薄膜的制造,应当尽可能少地使用由化石原料获得的聚合物,但并不必丧失对该类塑料薄膜,特别是对它们的机械性能、它们的阻隔性能和对其它必需的物理性能的不可缺少的品质要求。
为了在所述塑料薄膜的制造中节约聚合物材料,首先显而易见的是减小此类多层塑料薄膜的总厚度。然而,由于因此通常造成该类塑料薄膜机械性能例如其拉伸应力、耐撕裂蔓延性(Weiterreißfestigkeit)和任选的耐穿刺性的部分剧烈降低,这在该塑料薄膜进一步加工成为终产品的过程中不利于操作,由此也可造成生产故障。因此,此类节约材料的可能方式所产生的风险并非微不足道。另外,甚至在对具有≤ 20 µm的总层厚度的塑料薄膜进行离型处理时也可能存在困难。
因此,本发明的目的是提供基于柔性塑料薄膜的包装薄膜,其尽管将塑料薄膜的总层厚度减小到低于20 μm,依然具有优异的机械性能并确保基本上无故障的加工。
此目的通过提供如下包装薄膜实现:其包含至少单轴拉伸且具有≤ 18 μm,优选≤ 12 μm,更优选5 μm至≤ 12 μm的总厚度的多层塑料薄膜,且其根据DIN ISO 527-3在至少3 N/25 mm宽度,优选3 N至5 N/25 mm宽度的拉力下具有最多1%的伸长率。
优选地,本发明的包装薄膜仅由具有≤ 18 μm,优选≤ 12 μm,特别是5 μm至≤12 μm的总厚度的多层塑料薄膜组成,其特征在于:它在机器方向上具有至少1:2,优选至少1:3,更优选1:3-1:5的至少单轴的拉伸和根据DIN ISO 527-3在在至少3 N/25 mm宽度,优选3 N-5 N/25 mm宽度的拉力下最多1%的伸长率。
任选地,本发明的塑料薄膜也可以是双轴拉伸的,这意味着它具有与机器方向横向的1:2-1:3.5的拉伸。在双轴拉伸的情况下,即在机器方向上且在与机器方向横向上拉伸的情况下,这两个方向上的拉伸比可以不同,其中在机器方向上的拉伸优选大于在与机器方向横向上的。
根据本发明使用的塑料薄膜是多层的,优选至少三层的,更优选至少五层的。在其它优选的实施方案中,所述塑料薄膜可以具有7-11层。
根据本发明使用的多层塑料薄膜优选包含至少一个由下面的聚合物层构成的5层的构造:
(a) 作为外层的任选可密封的层(a),
(b) 增粘剂层(b),
(c) 任选具有阻隔作用的层(c),
(d) 增粘剂层(d),和
(e) 作为外层的任选可密封的层(e)。
根据本发明用作包装薄膜的塑料薄膜的各层优选由选自如下的热塑性聚合物制备:聚烯烃、聚酰胺、聚酯、生物可降解的聚合物、所提及的聚合物中至少两种单体的共聚物和所提及的聚合物中至少两种的混合物。
优选地,根据本发明用作包装薄膜的塑料薄膜由至少50重量%,更优选至少70重量%的聚烯烃,优选C2-C8烯烃聚合物,更优选C2-C3烯烃聚合物,它们的混合物或共聚物组成,并具有前面提及的特征如厚度、拉伸和伸长率。
本发明的塑料薄膜优选不包含环状烯烃聚合物或共聚物。
本发明的塑料薄膜的层(a)和(e)以及任选的层(c)优选各自相同或不同地基于具有2-8个,优选2-3个碳原子的α,β-不饱和烯烃的聚烯烃和烯烃共聚物,其优选选自:聚乙烯(PE),优选0.86-0.93 g/cm3的低密度聚乙烯(LDPE),0.86-0.94 g/cm3 的线性低密度聚乙烯(LLDPE),其除了乙烯外还包含一种或多种具有多于2个碳原子的α-烯烃作为共聚单体,0.926-0.94 g/cm3 的中密度聚乙烯(MDPE),0.94-0.97 g/cm3 的高密度聚乙烯(HDPE),乙烯与具有4个或更多个碳原子的α-烯烃的共聚物(mPE);聚丙烯(PP),聚异丁烯(PI),聚丁烯(PB)或优选具有1-10摩尔%乙烯的乙烯-丙烯共聚物(EPC)。特别优选地,可以使用LDPE与MDPE的混合物或LDPE、MDPE与PP的混合物用于制备层(a)、(e)和任选的(c),其中MDPE和任选的PP在混合物中的含量基于所述各个层的总重量计各自可为25重量%-85重量%。
层(a)和(e)也可以由烯烃/乙烯基羧酸共聚物或烯烃/乙烯基酯共聚物形成,如乙烯-丙烯酸共聚物(EAA),它们的酯如(EMA),乙烯-甲基丙烯酸共聚物(EMAA),它们的酯如(EMMA),优选具有60-99摩尔%乙烯的乙烯-乙酸乙烯酯共聚物(EVA),或前面提及的聚合物种类中各至少两种的混合物。
根据一个另外的实施方案,至少作为外层的层(e)可以基于至少一种聚酯或至少一种共聚酯,其优选选自:聚对苯二甲酸乙二醇酯(PET、c-PET、a-PET)和共聚物如coPET、PBT和coPBT)。“PET”是指通过乙二醇与对苯二甲酸缩聚制备的聚对苯二甲酸乙二醇酯。也可使用无定形的PET (a-PET)和结晶的PET (c-PET)。“coPET”是指除了乙二醇与对苯二甲酸之外还可包含其它单体例如支化或芳族二醇的共聚酯。“coPBT”是指聚对苯二甲酸丁二醇酯。优选地,使用的聚酯或共聚酯具有优选0.1-2.0 dl/g,更优选0.3-1.5 dl/g,特别是0.6-1.0 dl/g的特性粘度,其中用于测定特性粘度的方法是本领域技术人员已知的。合适的PET和PBT的详细描述公开在Kunststoffhandbuch第3/1卷–technische Thermoplaste:Polycarbonate, Polyacetale, Polyester, Celluloseester;Carl Hanser Verlag,1992,引用其内容全部。
在一个另外的实施方案中,至少层(e)可基于至少一种生物可降解的聚合物。使用的合适的生物可降解的热塑性聚合物可以是至少一种选自如下的生物可降解的聚合物:乳酸均聚物和共聚物,优选聚交酯,更优选DL-丙交酯、L-丙交酯和D-丙交酯,聚羟基链烷酸酯,纤维素,纤维素衍生物,热塑性淀粉,聚酯,优选聚己内酯,聚醚,至少部分皂化的聚乙酸乙烯酯,乙烯-乙烯醇共聚物和所提及的聚合物中至少两种单体的共聚物。
在一个另外的优选实施方案中,根据本发用作明包装薄膜的塑料薄膜具有至少一个具有阻隔作用的层(c)。本领域技术人员已知合适的聚合物,其可用于实现阻隔作用,特别是针对气体或香气损失、针对低分子量组分的迁移和/或针对口味或气味损害物,或针对湿气和/或针对油和脂肪的阻隔作用。
相应地,针对气体,优选针对O2、H2O蒸气和/或气体香料、针对低分子量组分的迁移和/或针对口味或气味损害物具有阻隔作用的层(c)基于至少一种选自如下的热塑性聚合物:乙烯-乙烯醇共聚物、聚乙烯醇、聚偏二氯乙烯、偏二氯乙烯共聚物、聚醚-聚酰胺嵌段共聚物和所述聚合物与乙烯-乙酸乙烯酯共聚物的混合物。优选的偏二氯乙烯共聚物具有80%或更高的偏二氯乙烯含量。乙烯-乙烯醇共聚物是特别优选的。
根据另一个优选的实施方案,针对湿气和/或油与脂肪的阻隔作用通过优选基于热塑性、脂族或(部分)芳族的聚酰胺或共聚酰胺或其混合物的层(c)得以实现。
作为用于制造至少一个层(c)的聚酰胺(PA)或共聚酰胺(coPA),可以优选使用脂族或(部分)芳族的聚酰胺,其优选具有160-240℃,更优选170-220℃的熔点。优选的是脂族聚酰胺,其中使用至少一种选自PA 6、PA 12、PA 6,6、PA 6,12、PA 6/6,6、PA 6,6/6的聚酰胺或共聚酰胺,或部分芳族聚酰胺如PA6T和PA6I,其优选也具有异佛尔酮二胺单元。聚酰胺和共聚酰胺的详细描述可见于Kunststoff-Handbuch 第VI卷, Polyamide, Carl HanserVerlag München, 1966;和Melvin I. Kohan, Nylon Plastics Handbook, Carl HanserVerlag München, 1995,引用其全部内容。
如已经提及的,特别可用于制造层(c)的是选自如下的均聚酰胺和/或共聚酰胺:热塑性、脂族、部分芳族和芳族且具有异佛尔酮二胺单元的均聚酰胺或共聚酰胺。这些具有异佛尔酮二胺单元的均聚酰胺或共聚酰胺可由具有2-10个碳原子的其它脂族和/或环脂族二胺如六亚甲基二胺和/或具有6-10个碳原子的芳族二胺如对-苯二胺,和由具有6-14个碳原子的脂族或芳族二羧酸,例如除对苯二甲酸和/或间苯二甲酸之外还有己二酸形成。另外,也可以使用在一起使用具有4-10个碳原子的内酰胺例如ε-己内酰胺的情况下制备的具有异佛尔酮二胺单元的聚酰胺。为了制造层(c),可优选使用具有异佛尔酮二胺单元的均聚酰胺和/或共聚酰胺,其中特别优选使用ε-己内酰胺、异佛尔酮二胺和芳族二羧酸,优选间苯二甲酸的共聚酰胺。
在一个优选的实施方案中,在层(c)的聚酰胺组分中的异佛尔酮二胺-间苯二甲酸单元的含量基于所述聚酰胺组分的总重量计为至少1-10重量%,更优选2-6重量%。
前面列举用于制造层(e)的热塑性聚酯也可用于制造层(c)。
通过作为阻隔层的层(c),可以在相应选择合适聚合物的情况下使本发明的多层塑料薄膜相对于没有阻隔层的相应塑料薄膜具有根据DIN 53380-3的显著降低的氧气渗透性,其在23°C和50%相对湿度下可为最多10.00 cm3/(m2·d·bar)。在此,根据本发明使用的多层塑料薄膜的氧气渗透性可以进一步降低至最多8 cm3/(m2·d·bar),优选最多7或6cm3/(m2·d·bar),更优选最多5、4或3 cm3/(m2·d·bar),还更优选最多2、1或0.5 cm3/(m2·d·bar),最优选最多0.4、0.3或0.2 cm3/(m2·d·bar),和特别是最多0.1、0.09或0.08 cm3/(m2·d·bar)(在每种情况下在23°C和50%相对湿度下)。
通过作为阻隔层的层(c),同样可以在相应选择合适的聚合物的情况下将根据本发明使用的多层塑料薄膜的水蒸气渗透性降低至前面提及的氧气渗透性值,其中水蒸气渗透性根据DIN ISO 53 122测定。
如果层(c)用作阻隔层,它优选通过增粘剂层(b)和(d)与相邻的层接合。
可用作增粘剂材料的合适的热塑性聚合物是本领域技术人员已知的。增粘剂层(b)和(d)相同或不同地优选基于优选改性的聚烯烃和/或烯烃共聚物,其优选选自:用羧基或环状酸酐基团改性的聚乙烯、聚丙烯,特别是用马来酸酐基团改性的聚乙烯、聚丙烯和乙烯-乙酸乙烯酯共聚物。优选的是用马来酸酐改性的PE、用COOH基团改性的PE、用羧基改性的乙烯-乙酸乙烯酯共聚物、乙烯-(甲基)丙烯酸酯共聚物、或用酸酐改性的乙烯-乙酸乙烯酯共聚物和包含前面提及的聚合物中至少两种的聚合物共混物。用马来酸酐改性的共聚物是特别优选的。
根据一个优选的实施方案,本发明的包装薄膜由具有如下构成的至少5层构造的塑料薄膜组成:
(a) 层(a),其基于聚乙烯混合物,优选由MDPE或LLDPE与LDPE的混合物和任选的其它填料和助剂制成,
(b) 增粘剂层(b),
(c) 阻隔层(c),其基于聚酰胺,优选脂族聚酰胺,或共聚酰胺,优选(部分)芳族共聚酰胺,
(d) 另一个增粘剂层(d),和
(e) 另一个层(e),其基于聚乙烯混合物,优选由MDPE或LLDPE与LDPE的混合物制成。
在一个另外的特别优选的实施方案中,根据本发明用作包装薄膜的多层塑料薄膜根据下面的层次序包含多于一个层(c):
(a) 任选可热密封、任选多层的层(a),其优选由至少一种热塑性烯烃均聚物或共聚物或其混合物形成并可对其设计离型涂层作为外层,
(b) 增粘剂层(b),
(c) 层(c),其优选由至少一种均聚酰胺和/或共聚酰胺形成,
(b) 任选的另一个增粘剂层(b),
(c) 另一个层(c),其优选由至少一种均聚酰胺和/或共聚酰胺,或乙烯-乙烯醇共聚物形成,
(d) 另一个增粘剂层(d),和
(e) 任选的可热密封的外层(e),其由至少一种热塑性烯烃均聚物或共聚物或其混合物形成。
层(c)基于如前面描述的均聚物、共聚物或聚合物混合物,更优选基于聚酰胺或乙烯-乙烯醇共聚物。另外的层的构造也优选对应于前面提及的关于这些层的说明。
根据本发明使用的多层塑料薄膜的各层可以各自含有相同或不同的选自如下的添加剂:抗氧化剂、防粘剂、防雾剂、抗静电剂、抗微生物活性物质、光保护剂、UV吸收剂、UV过滤剂、染料、着色颜料、稳定剂,优选热稳定剂、加工稳定剂和UV和/或光稳定剂,其优选基于至少一种位阻胺(HALS),加工助剂、阻燃剂、成核剂、结晶剂,优选晶核形成剂,润滑剂、光学增亮剂、增塑剂、硅烷、间隔剂、填料如CaCO3、硅酸盐、剥离添加剂、密封添加剂、蜡、润湿剂、表面活性化合物,优选表面活性剂,和分散剂。
根据本发明使用的塑料薄膜的各层可含有至少0.01-30重量%,优选至少0.1-20重量%的前面提及的添加剂的至少一种,在每种情况下基于所述单个层的总重量计。
本发明的塑料薄膜或包装薄膜没有压花且在其表面层上具有压花结构。
拉伸的本发明的塑料薄膜或包装薄膜此外具有优异的抗拉强度、良好至非常好的撕裂蔓延特征和优异的耐穿刺性,其中根据DIN EN ISO 527-3在至少3 N/25 mm宽度,优选3 N-5 N/25 mm宽度的拉力下出现最多1%的伸长率。
由此,本发明的包装薄膜虽然具有低的总层厚度但能够在包装机器上以通常高的拉拔(Abzug)速度进行加工而没有显著伸长。
另外,在机器方向上单轴拉伸但未压花且具有包含阻隔层(其特别是由所提及的部分芳族共聚酰胺之一制成)的至少5层构造的本发明的包装薄膜令人惊讶地在机器方向上具有比与机器方向横向高最大50%的耐撕裂蔓延性(根据 DIN 53356 - Schenkel),由此使其在机器方向上进一步的裂缝形成远远更少,并由此产生远远更少的次品和生产故障。
为了改进其离型作用,根据本发明用作包装薄膜的多层塑料薄膜也可在其外层之一上具有离型涂层。
该离型涂层优选基于固化的聚硅氧烷涂层,可以对根据本发明使用的多层塑料薄膜甚至在拉伸之前或拉伸之后配备这一涂层。产生离型作用的该离型涂层基本上存在于整个表面上,优选除了至少一个在机器方向上延伸的条带,或者存在于部分表面上,优选作为具有精确重复图案(rapportgenau)的横向条带。
术语“聚硅氧烷”在本发明的意义上是指其聚合物链由硅原子与氧原子交替形成的化合物。聚硅氧烷基于n个重复硅氧烷单元(-[Si(R2)-O]-)n,其各自相互独立地被两个有机基团R双取代,其中R各自优选为R1或OR1,且R1各自是烷基或芳基。所述固化的聚硅氧烷涂层优选基于重复的二烷基硅氧烷单元或基于重复的烷基芳基硅氧烷单元。取决于单个硅氧烷单元具有多少个Si-O键(各自基于四价硅原子),这些单元可以区分为具有一个Si-O键的末端单官能硅氧烷(M)、具有两个Si-O键的二官能硅氧烷(D)、具有三个Si-O键的三官能硅氧烷(T)和具有四个Si-O键的四官能硅氧烷(Q)。本发明的聚硅氧烷涂层优选具有交联的环状或链状结构,更优选交联的链状结构,其通过(D)、(T)和/或(Q)单元键合成为二维或三维网络。所述聚硅氧烷链中的重复硅氧烷单元[Si(R2)-O]-)n的数目n称为该聚硅氧烷的聚合度。
本发明的塑料薄膜的固化的聚硅氧烷涂层优选基于至少一种选自如下的固化的,即交联的聚硅氧烷:加成交联,优选用金属催化加成交联,缩合交联、自由基交联和/或阳离子交联的聚硅氧烷。
更优选地,所述聚硅氧烷涂层基于至少一种固化的聚硅氧烷,其已通过热固化和/或在UV辐射的作用下固化。所述聚硅氧烷涂层优选基于至少一种选自如下的固化的聚硅氧烷:聚二烷基硅氧烷,优选聚二甲基硅氧烷,和聚烷基芳基硅氧烷,优选聚甲基苯基硅氧烷,其在每种情况下是固化的。热固化的聚硅氧烷可以通过具有硅烷官能的聚硅氧烷与具有至少一个碳双键的化合物的热氢化硅烷化得到。UV固化优选在根据本发明使用的薄膜拉伸之后进行。同样地,热固化优选在本发明的包装薄膜拉伸之后进行。根据本发明,UV固化是优选的。
根据本发明使用的塑料薄膜原则上可以通过任意已知的制造方法,例如通过挤出或通过共挤出制造。
在此,所述塑料薄膜的单个层和全部层都可通过挤出,特别通过吹塑薄膜挤出和/或平膜挤出(流延挤出(Cast-Extrusion)),或优选共挤出,特别是吹塑薄膜共挤出和/或平膜共挤出(流延共挤出)形成,其中后者是优选的。这里应当注意的是,向层(a)或其它层加入添加剂的情况下,这些添加剂通过任选作为母料与各层的所述(一种或多种)聚合物组分混合用于加工。这一混合可以以丸粒/粉末形式或丸粒/丸粒形式干燥地进行。也可以将所述添加剂加入到各层的所述(一种或多种)熔融的聚合物组分中,优选通过计量加入到用于挤出各层的挤出机中。
根据本身已知的共挤出法,对应于根据本发明用作包装薄膜的薄膜的各个层的熔体同时且共同通过环状模头或扁平模头共挤出,将如此所得的薄膜拉拔到一个或多个辊上凝固,并使经拉伸的薄膜热定型。
双轴拉伸(取向)可相继或同时进行。相继拉伸通常接连进行,其中优选的是接连双轴拉伸,其中首先纵向(在机器方向上)和横向(与机器方向垂直)进行拉伸。在通过平膜挤出制造薄膜的情况下,通过随后的单轴或双轴拉伸,各个层的聚合物或聚合物混合物在挤出机中压缩和液化,其中任选加入的添加剂可以已存在于该聚合物或聚合物混合物中。所述熔体接着通过扁平模头(缝隙式模头)同时压制,并在10-100℃,优选10-50℃的温度下将压出的多层薄膜拉拔到一个或多个拉拔辊上,并冷却和凝固。
根据本发明使用的多层塑料薄膜接着相对于挤出方向仅仅纵向或纵向且横向地拉伸,这导致分子链的取向。纵向拉伸优选在70-130℃,优选80-110℃的温度下进行,有利地借助两个根据目标拉伸比以不同速度运行的辊,且任选额外的横向拉伸优选在120-180℃的温度下借助相应的伸幅机(Kluppenrahmen)进行。在此,可以设定希望的横向拉伸比。根据本发明优选的是仅在机器方向上的单轴拉伸。
根据本发明使用的薄膜的拉伸之后优选进行其热定型(热处理),其中将所述薄膜在100-160℃的温度下保持大约0.1-10秒。随后,任选在临时存贮之后,可以对本发明的薄膜配备任选存在的离型涂层。挤出的根据本发明使用的多层塑料薄膜也可以甚至在拉伸之前就配备有任选存在的离型涂层。
根据本发明使用的塑料薄膜或包装薄膜是未压花的。所述包装薄膜优选由前面描述的至少单轴拉伸的多层塑料薄膜组成。这些塑料薄膜可任选地与其它塑料薄膜和/或纸带(Papierbahn)接合。所述包装薄膜优选仅仅由前面描述的塑料薄膜组成。本发明的包装薄膜可优选是经印刷的。
本发明的另一目的在于由本发明的包装薄膜,优选根据本发明用作包装薄膜的塑料薄膜制成的包装,其优选用于各个种类的可粘性制品,更优选用于各个种类的可自粘性制品,更优选用于独立包装的可粘性制品,特别是用于一次性使用的那些。
本发明的另一目的在于由本发明的包装薄膜,优选根据本发明用作包装薄膜的塑料薄膜制成的包装,其用于任选可自粘性的卫生制品,优选用于独立包装的、任选折叠和/或任选可自粘性的卫生护垫、卫生巾或失禁制品,特别是用于一次性使用的那些。
下面实施例和对比例用于阐述本发明,但不应解释为限制。
I.使用的原料的化学特征
II.根据本发明使用的塑料薄膜(B1/B2)的制造
具有表II和III中给出的组成和给出的构造的每一个多层塑料薄膜通过在吹塑薄膜共挤出设备上共挤出来制造,其首先具有40µm的总层厚度。在该薄膜囊坍塌(Breitlegung)之后,将其供至辊轧拉伸设备并在纵向上以1:4的系数拉伸,以使由其得到的总薄膜厚度为10µm。根据DIN EN ISO 527-3在这些多层塑料薄膜上测定并示出下表IV中给出的物理性能。
III. 塑料薄膜的构造
下面全部的%数据各自是重量%。
III.1 实施例B1
(3层,总层厚度10 µm)
III.2 实施例B2
(5层,总层厚度10 µm)
表IV:根据DIN EN ISO 527-3的测量(条带宽度25 mm)
实施例1 (3层,未压花且单轴拉伸的)
实施例2 (5层,未压花且单轴拉伸的)
。
Claims (16)
1.包装薄膜,其特征在于:它包含具有≤ 18 μm,优选≤ 12 μm的总厚度的多层塑料薄膜,所述塑料薄膜至少单轴在机器方向上以至少1:2拉伸,由至少50重量%的聚烯烃组成且根据DIN EN ISO 527-3在至少3 N/25 mm宽度的拉力下具有最多1%的伸长率。
2.如权利要求1所述的包装薄膜,其特征在于:它由所述多层塑料薄膜组成。
3.如权利要求1或2所述的包装薄膜,其特征在于:所述塑料薄膜在机器方向上具有至少1:3的拉伸。
4.如权利要求1-3中任一项所述的包装薄膜,其特征在于:所述塑料薄膜由至少70重量%的聚烯烃,优选C2-C8烯烃聚合物,更优选C2-C3烯烃聚合物,它们的混合物或共聚物组成。
5.如前述权利要求中任一项所述的包装薄膜,其特征在于:所述塑料薄膜具有聚乙烯(PE),优选LDPE、MDPE、LLDPE,聚丙烯(PP),或所述聚烯烃中至少两种的混合物,优选LDPE与MDPE的混合物或LDPE、MDPE与PP的混合物作为聚烯烃。
6.如前述权利要求中任一项所述的包装薄膜,其特征在于:所述塑料薄膜具有至少一个阻隔层,优选针对气体,更优选针对O2、H2O蒸气和/或气体香料、针对脂肪和油、针对低分子量有机化合物的迁移和/或针对湿气的阻隔层。
7.如权利要求6所述的包装薄膜,其特征在于:所述塑料薄膜的阻隔层由乙烯/乙烯醇共聚物、聚乙烯醇、聚酰胺、共聚酰胺、聚酯和/或聚醚-聚酰胺嵌段共聚物形成。
8.如前述权利要求中任一项所述的包装薄膜,其特征在于:所述塑料薄膜具有至少一个如下构成的5层构造:
(a) 层(a),其基于聚乙烯混合物,优选由MDPE或LLDPE与LDPE的混合物和任选的其它填料和助剂制成,
(b) 增粘剂层(b),
(c) 阻隔层(c),其基于聚酰胺,优选脂族聚酰胺,或共聚酰胺,优选(部分)芳族共聚酰胺,
(d) 另一个增粘剂层(d),和
(e) 另一个层(e),其基于聚乙烯混合物,优选由MDPE或LLDPE与LDPE的混合物制成。
9.如权利要求8所述的包装薄膜,其特征在于:所述塑料薄膜的阻隔层基于脂族聚酰胺或(部分)芳族共聚酰胺,优选由ε-己内酰胺、异佛尔酮二胺和间苯二甲酸单元的共聚酰胺制成。
10.如前述权利要求中任一项所述的包装薄膜,其特征在于:所述塑料薄膜未压花。
11.如权利要求10所述的包装薄膜,其特征在于:所述在机器方向上拉伸但未压花的塑料薄膜在机器方向上具有比与机器方向横向更高的耐撕裂蔓延性。
12.如前述权利要求中任一项所述的包装薄膜,其特征在于:所述塑料薄膜在其表面中的至少一个上具有离型涂层,所述离型涂层优选由固化的聚硅氧烷制成。
13.由前述权利要求中任一项所述的包装薄膜制成的包装。
14.如权利要求13所述的包装,其用于卫生制品,优选用于独立包装的卫生护垫、卫生巾或失禁制品。
15.如权利要求14所述的包装,其用于独立包装的可粘性制品,优选用于一次性使用的可自粘性制品。
16.如权利要求15所述的包装,其用于可自粘性卫生制品或失禁制品。
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