CN106553396A - A kind of laminate wrapping material - Google Patents
A kind of laminate wrapping material Download PDFInfo
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- CN106553396A CN106553396A CN201510611276.8A CN201510611276A CN106553396A CN 106553396 A CN106553396 A CN 106553396A CN 201510611276 A CN201510611276 A CN 201510611276A CN 106553396 A CN106553396 A CN 106553396A
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- 239000000463 material Substances 0.000 title claims abstract description 54
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 45
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 45
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 30
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 30
- 230000004888 barrier function Effects 0.000 claims abstract description 25
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 24
- 239000000853 adhesive Substances 0.000 claims abstract description 22
- 230000001070 adhesive effect Effects 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 20
- 230000008018 melting Effects 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims description 10
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 claims description 9
- 238000010030 laminating Methods 0.000 abstract description 13
- 238000001125 extrusion Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 91
- 229920001684 low density polyethylene Polymers 0.000 description 48
- 239000004702 low-density polyethylene Substances 0.000 description 48
- 238000012856 packing Methods 0.000 description 20
- 235000013305 food Nutrition 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000005022 packaging material Substances 0.000 description 8
- 239000000123 paper Substances 0.000 description 7
- 239000010408 film Substances 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 235000021056 liquid food Nutrition 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 239000005030 aluminium foil Substances 0.000 description 3
- 239000012792 core layer Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 1
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000012939 laminating adhesive Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- 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
- B32B27/10—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 paper or cardboard
-
- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C09J123/0815—Copolymers of ethene with aliphatic 1-olefins
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a kind of laminate wrapping material, include thermoplastic outermost layer, sandwich layer, thermoplastic intermediate layer, barrier layer, adhesive phase and thermoplastic innermost layer, linear low density polyethylene of the thermoplastic binder material layer comprising metalloscene catalyst polymerization and linear low density polyethylene from outside to inside；The linear low density polyethylene of metalloscene catalyst polymerization has following parameter：Average density is 0.88g/cm3～0.925g/cm3, melt flow index（190℃、2.16kg）For 5g/10min～20g/10min, Peak melting point be 85 DEG C～130 DEG C, expansion ratio be 1.2～1.8；Linear low density polyethylene has following parameter：Average density is 0.90g/cm3～0.925g/cm3, melt flow index（190℃、2.16kg）For 5g/10min～20g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.2～1.8 extrusion laminating technology in, necking phenomenon of the adhesive phase in die head film extrusion of the molten condition from extruder has obtained largely reducing, and the energy and waste of raw materials phenomenon have and largely suppress.
Description
Technical field
The present invention relates to a kind of laminate wrapping material, more particularly to a kind of laminate wrapping material for packaging liquid food.
Background technology
At present，For the disposable ARTPackaging containers of liquid food，There is brick、It is square、Triangle、Cross section is the octahedral bodily form of hexagon、The shapes such as pillow-like，The laminate wrapping material for generally manufacturing these packing containers includes the thermoplastic outermost layer being sequentially laminated、Sandwich layer、Thermoplastic intermediate layer、Barrier layer、Adhesive phase and thermoplastic innermost layer，Also there are Low Density Polyethylene (LDPE)/printing layer of ink/paper (fiber) base layer/LDPE/ aluminium foil AL/LDPE/LDPE produced using high-pressure process、LDPE/ prints layer of ink/paper matrix layer/LDPE/LDPE、Printing layer of ink/LDPE/ paper matrixes layer/LDPE/LDPE、The laminate wrapping material of the multiple structures such as such as LDPE/ printing layer of ink/paper matrix layer/LDPE/ aluminum/polyester (PET).The food liquid that these packing containers can be packed has fresh milk, clabber, fruit juice etc..
Conventional core material has paper, kraft paper or hardboard etc., and conventional barrier material has aluminium foil, metal/inorganic oxide film, ethylene-vinyl alcohol copolymer（EVOH）, nylon etc., conventional thermoplastic outermost layer, intermediate layer, the Low Density Polyethylene of the useful high-pressure process production of material of innermost layer（LDPE）, linear low density polyethylene（LLDPE）, by the ethyleneα-olefincopolymer of metallocene catalyst catalyzed polymerization（mLLDPE）Deng thermoplastic, conventional binding agent has polyurethane binder, Polyester Polyurethane Adhesive, polyether polyurethane adhesive, acrylic adhesive, polyester binder, polyamide binder, polyvinylacetate adhesive, epoxy adhesive, rubber adhesive etc..
The effect of each layer of packaging material is：Thermoplastic outermost layer can effectively stop that moisture, pollution or other magazines in the external world are entered in packaging material, be that laminate wrapping material forms tubulose during laminate wrapping material forms packing container with thermoplastic innermost layer longitudinal sealing；Sandwich layer can support packing container；Thermoplastic intermediate layer and barrier layer can effectively prevent food liquid from entering into sandwich layer, while starvation, sunlight make packing container not light leak, air tight, particularly do not leak oxygen, ensure that food liquid taste is not lost in；Thermoplastic innermost layer is directly contacted with food liquid, and the infiltration of food liquid other each layers to packaging material is prevented while food liquid quality is ensured；Adhesive phase strengthens the adhesion strength between barrier layer and thermoplastic innermost layer.
Fig. 1 shows a kind of common method of manufacture laminate wrapping material，The pressure roller that machine guiding core layer coiled material 1 moves ahead by stamping station 2，Process the hole needed for packing container opening device and the impression needed for folded wrapping materials，Continue the sandwich layer coiled material 11 of guiding perforate forward，Reach laminating bench 5，Herein, extruder 3 squeezes out in the middle of thermoplastic layer coiled material and guides it to up to laminating bench 5，Stop that layer coiled material 4 is directed to laminating bench 5 simultaneously，Laminating bench 5 is laminated to three-layer coil material，In its roll gap center core layer、Thermoplastic intermediate layer and barrier layer are pressed together，And thermoplastic intermediate layer is located between sandwich layer and barrier layer，Thus become the guiding laminate 111 of laminate 111. and reach next stage laminating bench 6，Herein by coextruding and coat opposite side that thermoplastic innermost layer 7 is applied to 111 barrier layer of laminate，Laminate 111 and thermoplastic innermost layer 7 are pressed together in the roll gap of laminating bench 6，It is consequently formed the laminated material 1111 that inner side is coated with thermoplastic innermost layer，Thermoplastic outermost layer is coated with the outside of sandwich layer opposite side is by extrusion coated afterwards，So far obtain the laminate wrapping material used by packing container.Certainly, the outermost coating of thermoplastic is not necessarily required to be placed on final step and carries out, and applies in step suitable before also dependent on situation.
The laminate wrapping material that can be made in aforementioned manners produces the packing container of packaging liquid food.In order to prevent packaged food liquid from suffering secondary pollution, the production process of whole packing container is aseptically carried out：First laminate wrapping material is shaped to cylindric, and longitudinal direction sealing-in forms tube in side, then in the horizontal sealing-in in tube one end, form the top or bottom of packing container, food liquid needed for filling afterwards, finally by the horizontal sealing-in in remaining end of tube, the bottom or top of packing container are made.By cutting transverse packed region, single independent packing container can be formed, and by these independent packing containers be sent to it is final fold and shaped device in be converted into net shape, such as brick or other shapes.During packing container is formed, the bond strength between thermoplastic innermost layer and barrier layer affects the shelf lives of the qualification rate and food liquid of packing container to laminate wrapping material.
Chinese invention patent application prospectus CN1337914A discloses a kind of paper container package material, the composition layer for including at least has thermoplastic outermost layer, papery base layer, thermoplastic intermediate layer, barrier layer, adhesive phase and thermoplastic innermost layer and each composition layer is laminated by said sequence, is characterised by：Thermoplastic innermost layer includes at least the linear low density polyethylene with narrow molecular weight distribution, with following performance parameter：Average density 0.900-0.915,88-103 DEG C of Peak melting point, melt flow index 5-20, expansion ratio (SR) 1.4-1.6 and thickness 20-50 micron, adhesive phase are also adopted by making with aforementioned innermost layer identical material.The packaging material make it easy to pouring package packing container rapid heat-seal,Obtain the container of more firm higher sealing,The material can be used for the excellent sealing for being achieved independently of built-in food temperature and thus maintain the ability that built-in product never degenerates and guarantee the quality，But，This packaging material are in the extrusion laminating technology of manufacture process，Adhesive phase can occur serious necking phenomenon in die head film extrusion of the molten condition from extruder，Extruding two side of mould can be to middle shrinkage、The uneven phenomenon for breach even occur of edge thickness，Can so make that barrier layer both sides will not be capped or cladding thickness is uneven，There is flaw to prevent finished product packing material，Generally there are three kinds of solutions，It is a kind of be the die head of extruder is made it is more wider than the width on papery base layer and barrier layer，The unqualified part in extrusion mould both sides is made not cover on barrier layer，In follow-up lamination, cooling shaping is cut off again；Another kind be by the width of papery base layer and barrier layer do it is wider, after extrusion lamination, cut off the flaw part of packaging material both sides, obtain qualified packaging material；Furthermore necking phenomenon infringement is reduced by increasing adhesive phase thickness.The comparison that these three solutions are required for extruder die head wider than the width of papery base layer and barrier layer is more, need more heat molten thermoplastics, energy waste is caused, and the flaw part of packaging material both sides is also cut off after the completion of lamination, cause waste of raw materials.
The content of the invention
The technical problem to be solved is to provide a kind of laminate wrapping material, it is firmly combined between the barrier layer of the laminate wrapping material and innermost layer, made by packing container qualification rate it is high, the shelf lives of food liquid are long, and which will not occur serious necking phenomenon when extruding laminating adhesive in the fabrication process, not result in the serious energy and waste of raw materials.
To solve above-mentioned technical problem, the present invention is adopted the technical scheme that：A kind of laminate wrapping material, include thermoplastic outermost layer, sandwich layer, thermoplastic intermediate layer, barrier layer, adhesive phase and thermoplastic innermost layer from outside to inside, wherein, linear low density polyethylene of the described adhesive layer comprising metalloscene catalyst polymerization（MLLDPE）And Low Density Polyethylene（LDPE）；The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）With following parameter：Average density is 0.88g/cm3～0.925 g/cm3, melt flow index（190℃、2.16kg）For 5 g/10min～20
G/10min, Peak melting point are 85 DEG C～130 DEG C, expansion ratio is 1.2～1.8；The Low Density Polyethylene（LDPE）With following parameter：Average density is 0.90g/cm3～0.925 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.2～1.8.
In the present invention, melt flow index according to 190 DEG C in GB/T3682-2000 melt flow index assay methods, the condition determination of 2.16kg determines.Expansion ratio represent with identical condition determination in GB/T3682-2000 melt flow index assay methods（I.e. 190 DEG C, 2.16kg）Under, the cross sectional dimensions of the extrudate of measured depanning and the cross sectional dimensions ratio of die orifice.Peak melting point is obtained by differential scanning calorimetry, if two or more peak values, refers to first peak value.Low Density Polyethylene（LDPE）It can be linear low density polyethylene（LLDPE）, or non-linear Low Density Polyethylene, as long as the requirement of the present invention can be just met with above-mentioned performance parameter.
Improve as one kind of above-mentioned technical proposal, wherein, the linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）With following parameter：Average density is 0.90g/cm3～0.915 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20
G/10min, Peak melting point are 88 DEG C～120 DEG C, expansion ratio is 1.4～1.6.
As the further improvement of above-mentioned technical proposal, wherein, the linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Average density be 0.905g/cm3～0.910 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20
G/10min, Peak melting point are 93 DEG C～103 DEG C, expansion ratio is 1.4～1.6.
As the further improvement of above-mentioned technical proposal, wherein, the Low Density Polyethylene（LDPE）With following parameter：Average density is 0.910 g/cm3～0.92g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.4～1.6.
As the further improvement of above-mentioned technical proposal, wherein, the Low Density Polyethylene（LDPE）Average density be 0.915 g/cm3～0.920g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 93 DEG C～103 DEG C, expansion ratio be 1.4～1.6.
As the further improvement of above-mentioned technical proposal, wherein, the linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 50%～80%, the Low Density Polyethylene（LDPE）Weight percentage（wt）For 20%～50%.
As the further improvement of above-mentioned technical proposal, wherein, the linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 60%～75%, the Low Density Polyethylene（LDPE）Weight percentage（wt）For 25%～40%.
As the further improvement of above-mentioned technical proposal, wherein, the linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 70%, the Low Density Polyethylene（LDPE）Weight percentage（wt）For 30%.
The present invention compared with prior art, due to the adhesive phase of laminate wrapping material employ with particular characteristic parameter metalloscene catalyst polymerization linear low density polyethylene（MLLDPE）And Low Density Polyethylene（LDPE）In the extrusion laminating technology of manufacture process, necking phenomenon of the adhesive phase in die head film extrusion of the molten condition from extruder has obtained largely reducing, the energy and waste of raw materials phenomenon have and largely suppress, it is firmly combined between the barrier layer of laminate wrapping material and innermost layer, made by packing container qualification rate it is high, the shelf lives of food liquid are long.
Description of the drawings
Fig. 1 is a kind of schematic diagram of manufacture laminate wrapping material method;Fig. 2 is a kind of cross-sectional view of laminate wrapping material of the invention.
Specific embodiment
As shown in Fig. 2 a kind of laminate wrapping material of the invention includes thermoplastic outermost layer 21, sandwich layer 22, thermoplastic intermediate layer 23, barrier layer 24, adhesive phase 25 and thermoplastic innermost layer 26 from outside to inside successively.
Linear low density polyethylene of the adhesive phase 25 comprising metalloscene catalyst polymerization（MLLDPE）And Low Density Polyethylene（LDPE）, wherein, the linear low density polyethylene of metalloscene catalyst polymerization（mLLDPE）With following parameter：Average density is 0.88g/cm3～0.925 g/cm3, melt flow index（190℃、2.16kg）For 5 g/10min～20
G/10min, Peak melting point are 85 DEG C～130 DEG C, expansion ratio is 1.2～1.8；Low Density Polyethylene（LDPE）With following parameter：Average density is 0.90g/cm3～0.925 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.2～1.8, Low Density Polyethylene（LDPE）Can be linear low density polyethylene, or non-linear Low Density Polyethylene.The linear low density polyethylene of metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 50%～80%, Low Density Polyethylene（LDPE）Weight percentage（wt）For 20%～50%.
Coiled material of the sandwich layer 22 for paper substrates, after lateral surface printed patterns, crease line is suppressed Jing indentation roller and is stamped out after open hole, thermoplastic outermost layer 21 is formed by extruding laminating technology in the outside of sandwich layer 22 with low-density polyethylene material, continue the sandwich layer coiled material of guiding impression perforate forward, reach laminating bench, herein, extruder squeezes out the low-density polyethylene film as thermoplastic intermediate layer 23, laminating bench is directed to as the aluminum foil coiled material on barrier layer 24 simultaneously, it is compound that laminating bench carries out lamination to trilaminate material, in its 22 medial surface of roll gap center core layer, thermoplastic intermediate layer 23 and barrier layer 24 are pressed together, then, weight percentage in difference according to the form below 1（wt）The linear low density polyethylene (mLLDPE) and Low Density Polyethylene of blending metalloscene catalyst polymerization obtains blend, formation adhesive phase 25 on barrier layer 24 is laminated to the blend extrusion that thickness is 4,6,10,12 microns respectively, the blend from extruder die orifice be extruded into thin film when, thin film both sides do not form breach, edge thickness is substantially uniform, two sides can be to middle shrinkage very little, and the capped thickness in the multilayer material both sides is uniform.
Then, then be blended metalloscene catalyst polymerization linear low density polyethylene (mLLDPE) and Low Density Polyethylene obtain blend, wherein, metalloscene catalyst be polymerized linear low density polyethylene（mLLDPE）With following parameter：Average density is 0.910 g/cm3, melt flow index（190℃、2.16kg）For 13 g/10min, Peak melting point be 124 DEG C, expansion ratio be 1.5；Low Density Polyethylene（LDPE）With following parameter：Average density is 0.918 g/cm3, melt flow index（190℃、2.16kg）For 7 g/10min, Peak melting point be 107 DEG C, expansion ratio be 1.6, be laminated on the adhesive phase 25 of the multilayer material with blend that thickness is 22 microns extrusion and form thermoplastic innermost layer 26.
When the linear low density polyethylene (mLLDPE) and Low Density Polyethylene of blending metalloscene catalyst polymerization obtain blend, can be mixed using the granule Direct Uniform by both materials, can also be stirred using remelted after bi-material is mixed, carry out pelletize again to obtain composition granule is blended, the mixing homogeneity of latter approach is better than former.
Adhesive phase 25 and thermoplastic innermost layer 26 can be to be laminated on the aluminium foil on barrier layer 24 using two-layer co-extrusion mode, so can be with Simplified flowsheet, and adhesive phase 25 and 26 inter-layer bonding force of thermoplastic innermost layer are good.
Be firmly combined between the laminate wrapping material barrier layer 24 for obtaining and thermoplastic innermost layer 26, after pouring in liquid food on filling machine, made by packing container qualification rate it is high, the shelf lives of food liquid are long.
Claims (8)
1. a kind of laminate wrapping material, from outside to inside including thermoplastic outermost layer（21）, sandwich layer（22）, thermoplastic intermediate layer（23）, barrier layer（24）, adhesive phase（25）With thermoplastic innermost layer（26）, it is characterised in that：The thermoplastic binder material layer（25）Linear low density polyethylene comprising metalloscene catalyst polymerization（MLLDPE）And linear low density polyethylene（LLDPE）；The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）With following parameter：Average density is 0.88g/cm3～0.925 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～130 DEG C, expansion ratio be 1.2～1.8；The linear low density polyethylene（LLDPE）With following parameter：Average density is 0.90g/cm3～0.925 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.2～1.8.
2. a kind of laminate wrapping material according to claim 1, it is characterised in that：The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）With following parameter：Average density is 0.90g/cm3～0.915 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 88 DEG C～120 DEG C, expansion ratio be 1.4～1.6.
3. a kind of laminate wrapping material according to claim 1, it is characterised in that：The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Average density be 0.905g/cm3～0.910 g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 93 DEG C～103 DEG C, expansion ratio be 1.4～1.6.
4. a kind of laminate wrapping material according to claim 1, it is characterised in that：The linear low density polyethylene（LLDPE）With following parameter：Average density is 0.910
G/cm3～0.92g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 85 DEG C～110 DEG C, expansion ratio be 1.4～1.6.
5. a kind of laminate wrapping material according to claim 4, it is characterised in that：The linear low density polyethylene（LLDPE）Average density be 0.915
G/cm3～0.920g/cm 3, melt flow index（190℃、2.16kg）For 5 g/10min～20 g/10min, Peak melting point be 93 DEG C～103 DEG C, expansion ratio be 1.4～1.6.
6. a kind of laminate wrapping material according to any one of claim 1 to 5, it is characterised in that：The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 50%～80%, the linear low density polyethylene（LLDPE）Weight percentage（wt）For 20%～50%.
7. a kind of laminate wrapping material according to any one of claim 1 to 5, it is characterised in that：The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 60%～75%, the linear low density polyethylene（LLDPE）Weight percentage（wt）For 25%～40%.
8. a kind of laminate wrapping material according to any one of claim 1 to 5, it is characterised in that：The linear low density polyethylene of the metalloscene catalyst polymerization（mLLDPE）Weight percentage（wt）For 70%, the linear low density polyethylene（LLDPE）Weight percentage（wt）For 30%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110914056A (en) * | 2017-06-22 | 2020-03-24 | Sabic环球技术有限责任公司 | Silage membrane protocol |
| CN113263748A (en) * | 2021-07-19 | 2021-08-17 | 南通纳科达聚氨酯科技有限公司 | TPU complex film rubber coating laminating equipment of coloring |
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2015
- 2015-09-24 CN CN201510611276.8A patent/CN106553396A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110914056A (en) * | 2017-06-22 | 2020-03-24 | Sabic环球技术有限责任公司 | Silage membrane protocol |
| CN110914056B (en) * | 2017-06-22 | 2022-07-05 | Sabic环球技术有限责任公司 | Silage membrane protocol |
| CN113263748A (en) * | 2021-07-19 | 2021-08-17 | 南通纳科达聚氨酯科技有限公司 | TPU complex film rubber coating laminating equipment of coloring |
| CN113263748B (en) * | 2021-07-19 | 2021-09-28 | 南通纳科达聚氨酯科技有限公司 | TPU complex film rubber coating laminating equipment of coloring |
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