CN102470646B - Container laminated packaging material - Google Patents
Container laminated packaging material Download PDFInfo
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- CN102470646B CN102470646B CN201080029490.8A CN201080029490A CN102470646B CN 102470646 B CN102470646 B CN 102470646B CN 201080029490 A CN201080029490 A CN 201080029490A CN 102470646 B CN102470646 B CN 102470646B
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- 239000005022 packaging material Substances 0.000 title claims abstract description 52
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 61
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 59
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 57
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 57
- 239000000203 mixture Substances 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 32
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 28
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 28
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000003475 lamination Methods 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract 21
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 2
- 229920003235 aromatic polyamide Polymers 0.000 claims description 2
- 229920001903 high density polyethylene Polymers 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 19
- 239000000123 paper Substances 0.000 description 15
- 238000001125 extrusion Methods 0.000 description 14
- 239000010408 film Substances 0.000 description 6
- 239000004711 α-olefin Substances 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive Effects 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 3
- NVKDFGCILHNHRS-UHFFFAOYSA-N C1(C=CC=C1)[Au] Chemical compound C1(C=CC=C1)[Au] NVKDFGCILHNHRS-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 239000004698 Polyethylene (PE) Substances 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive Effects 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 230000002349 favourable Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-Hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-Octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920001225 Polyester resin Polymers 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003078 antioxidant Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000002902 bimodal Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-M carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- 125000004432 carbon atoms Chemical group C* 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010096 film blowing Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000011068 load Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- TWXTWZIUMCFMSG-UHFFFAOYSA-N nitride(3-) Chemical compound [N-3] TWXTWZIUMCFMSG-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001888 polyacrylic acid Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002522 swelling Effects 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention discloses the laminated packaging material of a kind of container for liquid, described packaging material include thermoplastic outermost layer, paper substrate sheet material layers and thermoplastic innermost layer, this thermoplastic innermost layer includes linear low density polyethylene (LLDPE) and the blend of Low Density Polyethylene (LDPE), and this blend has the low bulk ratio of 0.9 to 1.2.This blend can have the melt flow index of 5 to 20dg/min further.The LLDPE component of blend is obtained by polymerization in the presence of single site catalysts, and has the average density of 0.86 to 0.92g/mL and the Peak melting point of 55 to 105 DEG C.The thermoplastic innermost layer using this blend to prepare advantageously has the relatively low thickness of 8 25 μm.More effective lamination process and fast heat-sealing are allowed in the use of these packaging material, and cause the firm and container of strong sealing.It provides relatively low material usage and less material to overflow aborning, and it has cost advantage and environmental advantage, the most relatively low carbon footprint.
Description
The present invention relates to a kind of container laminated packaging material, it includes the substrate layer and at least of paper
One other layer containing at least linear low density polyethylene.
The non-returnable container of the product packing such as slop is known.A large amount of this lists
The non-returnable container of secondary use is to be prepared by laminated packaging material, and this laminated packaging material comprises paper
Or the core of cardboard or substrate layer and the external coating of the thermoplastic on this sandwich layer two sides.
Normally used thermoplastic includes Low Density Polyethylene (LDPE).
The conventional liquid-tight layers of LDPE material can have disadvantages that.Strong in order to obtain having enough machinery
Degree and fluid-tight longitudinal sealing interface, traditional LDPE layer must be thicker.It addition, have
The wrapper zoarium of LDPE outer layer needs of a relatively high heat-sealing temperature, and it consumes in this process
The most energy.
There is the catalyst (" single site catalyst ") in single site, such as metallocene
Being polymerized the ethylene alpha olefin copolymer obtained in the presence of catalyst is it is well known that because they are
Make the mechanical strength the most also with excellence, such as high tenacity, elasticity and puncture resistance.
The ethylene copolymer prepared in this way is referred to as cyclopentadienyl gold in the case of metallocene catalyst
Belong to linear low density polyethylene (metallocene LLDPE or mLLDPE) or metallocene PE (mPE),
Famous compared to the tradition heat sealability that had at a relatively low temperature of LDPE with it.Separately
Outward, metallocene LLDPE is used to obtain narrow molecular weight distribution.But, the cyclopentadienyl gold of respective pure form
Belong to LLDPE also have a series of shortcoming because in extrusion laminate under respective pure form compared to
LDPE obtains poor processing characteristics.
The mixture of LDPE and LLDPE used in wrapper zoarium is described in
In US4590126, WO 98/26994 and EP 1164085.
US4590126 and WO 98/26994 discloses preferred LDPE and LLDPE mixture and contains
Have an excess amount of LLDPE, it may be assumed that in US4590126 85% amount LLDPE and at WO98/26994
The LLDPE of middle 70-80% amount.
EP1164085 discloses a kind of laminated packaging material, and it includes thermoplastic outside at least one
Property material layer, refill layer and inner side thermoplastic material layer, wherein inner side thermoplastic material layer is contained
At least linear LDPE, this LDPE have these parameters: 0.900-0.915g/mL average density,
Predetermined peak value fusing point, the melt flow index of 5-20 and the expansion ratio of 1.4-1.6 of 88-103 DEG C
(swelling ratio).The layer thickness of this LDPE layer is 20-50 μm.
It is an object of the invention to provide a kind of laminated packaging material preparing container, itself and existing skill
The performance with improvement compared by packaging material disclosed in art.
To this end, provide the laminated packaging material of a kind of slop container, it includes thermoplasticity
Material outermost layer, paper substrate sheet material layers and thermoplastic innermost layer, described thermoplastic innermost layer
Containing linear low density polyethylene (LLDPE) and the blend of Low Density Polyethylene (LDPE),
Also referred to as LDPE/LLDPE blend, this blend has a low expansion ratio, and i.e. 0.9 to 1.2
Expansion ratio.
Run through the present invention, with term " linear low density polyethylene ", " LLDPE ", " cyclopentadienyl gold
Belong to LLDPE " or " mLLDPE " define and prepared by polymerization in the presence of single site catalysts
LLDPE.The example of such single site catalysts is metallocene catalyst and is sometimes referred to as
The catalyst of " rear metallocene " catalyst.
According to formula SR=ds/doDefinition expansion ratio SR, wherein dsIt it is the melt polymerization from spray orifice extrusion
The trans D of thing, and doIt it is the diameter of spray orifice.Measure diameter at identical conditions, such as
For measuring those conditions of the ISO1133 method of melt flow index.
The expansion ratio of preferred blends is 0.9 to 1.1.
Have now found that in extrusion laminate, low bulk ratio in the range of use has 0.9 to 1.2
LDPE/LLDPE blend time obtain extruded material low constriction (neck-in) effect.
Mould port expansion (die swell) and extrudate after extrudate leaves the spray orifice of extrusion mould-outlet
The phenomenon that increases immediately of diameter relevant.In thin film is extruded, this can produce thin film layer thickness side
Minimizing in terms of the increase in face and width.Extrusion mould-outlet rear film width is had been moved off at material
Reduce and be referred to as telescopic effect.Constriction can produce uncoated area on base material, and can cause
The side of extrusion film is the thickest, and it will cause the uneven thickness of packaging material outer layer.By not making
The end fit with extruding layer is it can be avoided that the less desirable phenomenon of the two.But it is because this material
This overflow (spills) part, can obtain because of loss of material and higher costs disadvantageous
Situation.
The another advantage of LDPE/LLDPE blend as described herein is can be advantageously
Obtain the thermoplastic innermost layer of low thickness, the thickness of such as 8 to 25 μm, preferably 10
To 20 μm, more preferably 12 to 18 μm, most preferably 13 to 17 μm.Thermoplastic is interior
The low thickness of layer is favourable, because metallocene LLDPE is expensive.Therefore, at thin layer
Manufacture in, put at the thickness reduced containing metallocene LLDPE layer and reducing in spill-out
Big effort.Low thickness also brings along less raw material and uses and transport, and provides benefit for environment
Place, the lowest carbon footprint (carbon-footprint).
Thermoplastic innermost layer described here is towards appearance when packaging material are formed as container
Layer within device.
Except low bulk than in addition to, the melt flow index of LDPE/LLDPE blend be preferably 5 to
20dg/min (=g/10min), preferably 6 to 15dg/min, more preferably 7 arrive 12dg/min.
Melt flow index is defined as in 10 minutes, by the gravimetric weight institute via regulation
The pressure (190 DEG C/2.16kg) at the specified temperature applied flows through the hair of special diameter and length
The quality grams of the polymer of tubule.The method is carried out according to ISO1133.
For obtaining the LDPE/LLDPE blend with 0.9 to 1.2 scope low bulk ratio, it is necessary to
Select suitable LLDPE with caution.
LLDPE to be used has relatively low long chain branching (LCB) degree.As at discovered in recent years
, relatively low but be not the LCB of too low amounts in single site catalysts LLDPE, exist for reducing
Constriction in Extrusion Coating is favourable.That is exactly the Producers of LLDPE the most in recent years
Finding method changes this reason being sometimes referred to as " sparse LCB " in their material.
The example of progress is such as, the SLEP (substantially linear polyethylene) of DOW Chemical,
The dual reactor process Borstar bimodal distribution weight northylen of Borealis and the routine of Dow/
Unit point hybrid catalyst system ELITETM series.But also there is the mLLDPE of more type
(such as EXACTTM plastics, (ex DEXPLASTOMERS)) can show required feature.
Therefore, it can to look in above-mentioned range of resin use as described herein suitable
LLDPE。
This LLDPE also has narrow molecular weight distribution (MWD), such as Mw/MnThan≤2.8, excellent
Choosing≤2.6 (Mw=weight-average molar mass, Mn=mumber average molar mass).
LLDPE to be used also has the low bulk ratio of 0.9 to 1.2, preferably 0.9 to 1.1.
LLDPE to be used can also have such as average density specified below and Peak melting point.
The average density of LLDPE can be 0.86 to 0.92g/mL, preferably 0.88 to 0.91
g/mL.Average density is measured according to ISO1183.
The Peak melting point of LLDPE can be 55 to 105 DEG C, preferably 70 to 100 DEG C, more preferably
90 to 100 DEG C.Differential scanning calorie meter (DSC) is used to measure peak value according to ASTM D3418
Fusing point.
In one embodiment, using the blend of at least two LLDPE, a kind of is average
In the part that density is relatively low in density range, i.e. 0.86 to 0.89g/mL；And another
In the part that average density is higher in density range, i.e. 0.89 to 0.92g/mL.Mixing is extremely
Few both can obtain with greater need for performance.
Combined polymerization typically via ethylene and alpha-olefin obtains LLDPE, and described alpha-olefin is excellent
Choosing is the alpha-olefin with 4-8 carbon atom, such as 1-butylene, 1-hexene, 4-methyl isophthalic acid-
Amylene and 1-octene, be preferably used metallocene catalyst.Alpha-olefin can individually or mixing make
With.Preferably want α-alkene that the ethylene of combined polymerization and the mixture of alpha-olefin contain 1-20wt%
Hydrocarbon.
The conventional LDPE of Extrusion Coating can be applied to by the kind of LDPE in the blend.
The expansion ratio of LDPE and long chain branching level compare to these character less crux of LLDPE.Can
To be conveniently used the LDPE of expansion ratio 1.2 to 1.4.Suitably LDPE such as can be from INEOS
Obtain.
Ratio contained in the blend for LLDPE and LDPE is mainly by the spy of the LLDPE used
Levy decision.It is of importance that to mix each component to obtain having being total to of character as disclosed in here
Mixed thing, particularly low bulk ratio.Typically, gross weight based on LLDPE and LDPE, it is blended
In thing, the content of LLDPE is 30% to 80% (w/w), preferably 40% to 75% (w/w), more
Preferably 50% to 70% (w/w).
As long as the performance of blends described above can be maintained, being total to of thermoplastic innermost layer to be provided
In mixed thing, can be containing the polymers compositions in addition to LLDPE and LDPE.The example of additional polymer
Son is thermoplastic resin, such as vistanex (such as polyethylene, polypropylene, ethylene copolymer
Thing) and/or polyester resin.
It addition, depend on required purposes, can add containing various in thermoplastic innermost layer
Add agent, although non-additive layer is preferably used.The example of appropriate addn is antioxidant, purple
Ultraviolet absorbers, antistatic additive, lubricant, anti-blocking agent, fire retardant, inorganic and/or organic
Filler, coating material and/or pigment.
Laminated packaging material includes layer as described herein, it may be assumed that thermoplastic innermost layer, paper
Substrate layer and thermoplastic outermost layer.Furthermore it is possible to include extra play, such as barrier layer and
Adhesion heat plastic coat.Typical laminated packaging material contains thermoplastic innermost layer, glues
Close layer, barrier layer, adhesive layer, paper substrate sheet material layers and thermoplastic outermost layer.
Paper substrate sheet material layers can be prepared by kraft pulp (kraft pulp), and kraft pulp provides tool
There is the paper of high intensity and low absorption.Example be bleached paper (FBL), non-bleached paper (UBL),
The duplex paper (DUPLEX) of FBL and UBL, clay coated paper, multilamellar bilayer-paper (MB) etc.
Deng.
Thermoplastic outermost layer can comprise vistanex, such as, include medium density polyethylene
And/or the polyethylene of Low Density Polyethylene, polypropylene and ethylene copolymer, it is possible to have and contain
Having the coextruded layer of LLDPE, it is such as the toleration side of oil, acid and penetration etc.
Face is the most excellent.
In one embodiment, thermoplastic outermost layer and/or in lamilated body any other
Polymeric layer, containing at least here for the LDPE/LLDPE blend as described in innermost layer.
The packaging material of paper container can also contain printing ink layer at the outer surface of packaging material.
Described ink can be for flexographic printing, intaglio printing, hectographic printing etc. based on water or
The ink of oil.
Barrier layer to be included provides the lamilated body of the barrier property with anti-light or gas.Typical case
Ground, barrier layer can comprise aluminium foil, metal/inorganic oxide film, ethylene vinyl alcohol copolymer
Nitride layer (evoh layer), nylon layer, polyvinylidene chloride film at least one.
The bonding of two different layers can be improved containing adhesion heat plastic coat.It can contain
Have have the LLDPE of Narrow Molecular Weight Distribution, ethylene-vinyl acetate copolymer (EVA) and from
Polymers.The thickness of adhesive layer can be about 3-25 μm suitably.
In addition to above-mentioned laminated packaging material, it is possible to use strip tape (strip tape) covers
The discontinuous part of innermost layer between lid pack material two edges.In this approach, Ke Yi
The container formed by these packaging material provides fluid-tight sealing.Strip tape can be advantageously
Lamilated body, this lamilated body includes containing LDPE/LLDPE blend as described herein, lamination
Layer at least side in intermediate layer.Intermediate layer can be by the heat providing enough hardness to this layer
Plastic material prepares.Such as, intermediate layer can be high density polyethylene (HDPE) (HDPE), polyester (example
Such as (amorphous) PET) or aramid layer.Preferably, strip tape all wraps on the both sides in intermediate layer
Include the layer containing LDPE/LLDPE blend.
The packaging material of paper container can use commonly known Lamination techniques to manufacture.
Such as, the conventional laminating method of the packaging material of paper container includes wet method lamination, dry method
Lamination, non-solvent dry lamination, extrusion laminate, coextrusion lamination, thin film blowing etc..Must
When wanting, pretreatment such as sided corona treatment, ozonisation etc. can be carried out on thin film.Furthermore it is possible to
Use combine smears (anchor-coat agents) such as isocyanates (carbamate),
Polymine, polybutadiene and organic titanium；Laminating adhesive such as polyurethane, polyacrylic acid
Ester, polyester, epoxy resin, polyvinyl acetate and cellulose.
As explained above, fit if making wrapper by extrusion laminate legal system, it is possible to obtain
More advantage of the present invention.
Easily, the packaging material of lamination preparing filling container is by by the packing timber of lamination
Material is shaped to tubulose, applies longitudinal sealing, use product wadding warp molding along packaging material edge
Packaging material, transverse sealing by filling wrapper is provided on the packaging material filled
The required form being shaped to such as brick shape is carried out.Finally, in order to protect at longitudinal seal
Interior packaging material edge, can bring the portion of the level difference covering innermost layer with liquid-tight strip
Point.It is equipped with spout and/or draw ring (pull tab) furthermore, it is possible to provide on the top of container
Hole.
More effective lamination process and fast heat are allowed in the use of packaging material as described herein
Envelope, and form the firm and container of strong sealing.It provides relatively low material usage aborning
Overflowing with less material, it has cost advantage and environmental advantage, the most relatively low carbon footprint.
Embodiment
The character of embodiment 1 LDPE/mLLDPE blend
Use the metallocene linear-low density polyethylene (mLLDPE) with Narrow Molecular Weight Distribution.
This mLLDPE has the average density of 0.90g/ml, the Peak melting point of 95 DEG C, 10dg/min
Melt flow index and the expansion ratio of 1.0.The Low Density Polyethylene (LDPE) used has
The average density of 0.92g/ml, the Peak melting point of 108 DEG C, the melt flow index of 7.3dg/min
With 1.35 expansion ratio.
LDPE/mLLDPE ratio with 50/50 and 30/70 mixes LDPE and mLLDPE.50/50
Blend there is the average density of 0.910, the Peak melting point of 106 DEG C, the melt flows of 7.3
Index and the expansion ratio of 1.0.The blend of 30/70 have 0.906 average density, 104 DEG C
Peak melting point, the melt flow index of 8.1 and the expansion ratio of 1.1.
Average density is measured according to ISO 1183, and Peak melting point is according to ASTM with DSC
D3418 measures, and melt flow index is measured according to ISO 1133.According to formula
SR=ds/doDefinition expansion ratio, wherein dsIt is the trans D of the molten polymer extruded from spray orifice,
And doIt is the diameter of spray orifice, surveys under conditions of identical with test condition in ISO 1133 method
Determine diameter.
The extrusion laminate of embodiment 2 blend and the character of resultant layer zoarium
LDPE/mLLDPE ratio mix embodiment 1 with 60/40,40/60 and 30/70
MLLDPE and LDPE.The extrusion film obtained by this blend and the extrusion obtained by pure LDPE
Thin film is compared, and shows relatively low constriction.Compared with pure LDPE, 60/40,40/60 and 30/70
The constriction of blend reduces about 50%, 70% and 80% respectively.This measurement be extrudate from
Carry out rapidly after opening the extrusion mould-outlet of extrusion laminate machine, and in the case of non-actuated.It addition,
The extrusion film obtained by this blend shows to be increased along with the amount of mLLDPE in the blend
Puncture resistance.
The thermoplastic obtained by these blends with the incompatible further lamination of extruding layer is interior
Layer, and prepare the laminate film containing aluminium foil/adhesive layer/thermoplastic innermost layer.Gained is
The thickness of internal layer is 16 ± 1 μm.
Embodiment 3 prepares band and container
Use traditional loading machine, use packaging material to manufacture the packing container of brick, described
Packaging material include containing such as the LDPE/mLLDPE blend described in embodiment 1 and 2
Innermost layer seals the strip tape on top layer/pet layer/sealing top layer with having laminated construction.
The sealing top layer of strip tape is mLLDPE and LDPE described in the embodiment 1 and 2
Intermingling material.Seal top layer to be expressed on PET film, and obtain 6-12mm width by tearing to cut
Laminar strip band.
For 50/50LDPE/mLLDPE blend (participating in embodiment 1), use thickness 23
The PET film of μm obtains band.The thickness of LDPE/mLLDPE layer is 27 μm.For 40/60
Blend (seeing embodiment 2), use thickness 15 μm PET film obtain band.
The thickness of LDPE/mLLDPE layer is 32 μm.
The seal temperature scope of the longitudinal sealing of gained packing container is evaluated.
It can be shown that compared with the band containing LDPE layer, blend shows superior performance.
Such as, blend provides sealing under than pure LDPE lower temperature.
Claims (21)
1. being used for the laminated packaging material of the container of liquid, described packaging material comprise thermoplasticity material
Material outermost layer, paper substrate sheet material layers and thermoplastic innermost layer, this thermoplastic innermost layer comprises
By in the presence of a metallocene catalyst by polymerization prepare have 0.9 to 1.2 the line of expansion ratio
The blend that property Low Density Polyethylene (LLDPE) and Low Density Polyethylene (LDPE) form,
This blend has the expansion ratio of 0.9 to 1.2 and the melt flow index of 5 to 20dg/min；
And LLDPE content is the gross weight meter 30 adding LDPE based on LLDPE in blend
To 80% (w/w), wherein the average density of LLDPE is 0.86 to 0.92g/mL and peak value
Fusing point is 55 to 105 DEG C.
2. the laminated packaging material of the container for liquid of claim 1, wherein blend
Expansion ratio is 0.9 to 1.1.
3. the laminated packaging material of the container for liquid of claim 1 or 2, is wherein blended
The melt flow index of thing is 6 to 15dg/min.
4. the laminated packaging material of the container for liquid of claim 1 or 2, is wherein blended
The melt flow index of thing is 7 to 12dg/min.
5. the laminated packaging material of the container for liquid of claim 1 or 2, wherein
The average density of LLDPE is 0.88 to 0.91g/mL.
6. the laminated packaging material of the container for liquid of claim 1 or 2, wherein
LLDPE comprises at least two, a kind of average density with 0.86 to 0.89g/mL, and separately
A kind of average density with 0.89 to 0.92g/mL.
7. the laminated packaging material of the container for liquid of claim 1 or 2, is wherein blended
In thing, based on LLDPE, LLDPE content adds that the gross weight of LDPE is calculated as 40% to 75%
(w/w)。
8. the laminated packaging material of the container for liquid of claim 1 or 2, is wherein blended
In thing, based on LLDPE, LLDPE content adds that the gross weight of LDPE is calculated as 50% to 70%
(w/w)。
9. the laminated packaging material of the container for liquid of claim 1 or 2, is wherein blended
In thing, based on LLDPE, LLDPE content adds that the gross weight of LDPE is calculated as 50% to 80%
(w/w)。
10. the laminated packaging material of the container for liquid of claim 1 or 2, Qi Zhongre
The thickness of plastic material innermost layer is 8 to 25 μm.
The laminated packaging material of the container for liquid of 11. claim 1 or 2, Qi Zhongre
The thickness of plastic material innermost layer is 10 to 20 μm.
The laminated packaging material of the container for liquid of 12. claim 1 or 2, Qi Zhongre
The thickness of plastic material innermost layer is 12 to 18 μm.
The laminated packaging material of the container for liquid of 13. claim 1 or 2, Qi Zhongre
The thickness of plastic material innermost layer is 13 to 17 μm.
The laminated packaging material of the container for liquid of 14. claim 1 or 2, Qi Zhongre
Plastic material outermost layer also includes such as the blend defined in claim 1 or 2.
The strip tape of 15. containers being used for liquid, this strip tape is to comprise intermediate layer and be laminated to
Containing as limited in any one of claim 1 to 14 at least side in intermediate layer
The lamilated body of the layer of LDPE/LLDPE blend.
The strip tape of 16. containers being used for liquid, this strip tape is to comprise intermediate layer and be laminated to
Containing as limited in any one of claim 1-14 on the both sides in intermediate layer
The lamilated body of the layer of LDPE/LLDPE blend.
The strip tape of the container for liquid of 17. claim 15 or 16, wherein intermediate layer
It is high-density polyethylene layer, polyester layer or aramid layer.
The laminated packaging material of the container for liquid of 18. any one of manufacturing claims 1-14
Method, wherein use the incompatible lamination carrying out at least thermoplastic innermost layer of extruding layer.
The laminated packaging material of 19. containers for liquid using any one of claim 1-14
The method manufacturing container.
The method of 20. claim 19, wherein this container contains required product further, and should
Method includes: packaging material are shaped to tubulose, along packaging material edge apply radial seal,
With the packaging material of product wadding warp molding, fill packaging material on provide transverse sealing,
And filling wrapper is shaped to required shape.
The method of 21. claim 20, wherein radial seal comprises between packaging material two edges
The discontinuous part of interior thermoplastic layer, and the method farther includes by claim 15 or 16
The strip for the container of liquid bring covering this discontinuous part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP09165084 | 2009-07-09 | ||
| EP09165084.6 | 2009-07-09 | ||
| PCT/EP2010/059877 WO2011004001A1 (en) | 2009-07-09 | 2010-07-09 | Laminated packaging material for a container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102470646A CN102470646A (en) | 2012-05-23 |
| CN102470646B true CN102470646B (en) | 2016-12-14 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101837A (en) * | 1985-04-01 | 1987-01-10 | 太特国际公司 | A kind of packing laminate sheet |
| CN1337914A (en) * | 1999-01-27 | 2002-02-27 | 泰特拉-勒维尔金融控股公司 | Laminated packaging material for paper container |
| CN1376111A (en) * | 2000-05-26 | 2002-10-23 | 利乐拉瓦尔集团及财务有限公司 | Process for producing pakaging laminate |
| US6509106B1 (en) * | 1998-08-18 | 2003-01-21 | Eastman Chemical Company | Blends containing linear low density polyethylene, high density polyethylene, and low density polyethylene particularly suitable for extrusion coating and films |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101837A (en) * | 1985-04-01 | 1987-01-10 | 太特国际公司 | A kind of packing laminate sheet |
| US6509106B1 (en) * | 1998-08-18 | 2003-01-21 | Eastman Chemical Company | Blends containing linear low density polyethylene, high density polyethylene, and low density polyethylene particularly suitable for extrusion coating and films |
| CN1337914A (en) * | 1999-01-27 | 2002-02-27 | 泰特拉-勒维尔金融控股公司 | Laminated packaging material for paper container |
| CN1376111A (en) * | 2000-05-26 | 2002-10-23 | 利乐拉瓦尔集团及财务有限公司 | Process for producing pakaging laminate |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20210709 |