CN102179985B - Polyethylene (PE) film and preparation method thereof - Google Patents
Polyethylene (PE) film and preparation method thereof Download PDFInfo
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- CN102179985B CN102179985B CN201110066337.9A CN201110066337A CN102179985B CN 102179985 B CN102179985 B CN 102179985B CN 201110066337 A CN201110066337 A CN 201110066337A CN 102179985 B CN102179985 B CN 102179985B
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 95
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- -1 Polyethylene Polymers 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000004140 cleaning Methods 0.000 claims abstract description 55
- 238000004806 packaging method and process Methods 0.000 claims abstract description 32
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- 229920001684 low density polyethylene Polymers 0.000 claims description 34
- 239000004702 low-density polyethylene Substances 0.000 claims description 34
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 33
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 33
- 239000004677 Nylon Substances 0.000 claims description 28
- 229920001778 nylon Polymers 0.000 claims description 28
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- 229920005989 resin Polymers 0.000 claims description 13
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- 238000000071 blow moulding Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 abstract description 9
- 239000010408 film Substances 0.000 description 112
- 238000012856 packing Methods 0.000 description 24
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- 238000005260 corrosion Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
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- RTKIYNMVFMVABJ-UHFFFAOYSA-L thimerosal Chemical compound [Na+].CC[Hg]SC1=CC=CC=C1C([O-])=O RTKIYNMVFMVABJ-UHFFFAOYSA-L 0.000 description 2
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Abstract
The invention provides a polyethylene (PE) film and a preparation method thereof. The PE film sequentially comprises a composite layer, an intermediate layer and a heat-seal layer, wherein the composite layer comprises 25 to 40 weight percent of low-density PE, 25 to 40 weight percent of linear low-density PE and 33 to 45 weight percent of modified metallocene linear low-density PE; the intermediate layer comprises 25 to 50 weight percent of the low-density PE and 50 to 75 weight percent of the linear low-density PE; and the heat-seal layer comprises 28 to 35 weight percent of the low-density PE and 65 to 72 weight percent of the linear low-density PE. The invention also provides a cleaning solution packaging composite film and a cleaning solution packaging bag, wherein the cleaning solution packaging composite film is prepared from the PE film. Correspondingly, the invention also provides a preparation method of the cleaning solution packaging composite film which is prepared from the PE film. A product is packaged by the PE film provided by the invention, so the packaging bag has certain solvent resistance and excellent heat-seal performance, the relatively high sealing property and tensile strength of a material subjected to heat sealing are guaranteed, and the leakage resistance and falling resistance of the composite film which is prepared by the material are further improved.
Description
Technical field
The present invention relates to cleaning product packaging field, particularly polyethylene film and preparation method thereof, cleaning solution packaging composite film and preparation method thereof and packing bag for detergent.
Background technology
Along with the pay attention to day by day of people to healthy and health, the kind of cleaning solution is short increasing not in recent years, and demand also constantly increases, and articles for washing has become the necessary article of people's life.With respect to solid kind cleaning solution articles for use, cleaning solution good water solubility, does not need induced lysis, uses more for convenience, is particularly suitable for urban human group and washs frequently needs.But because the cleaning solution property that flows is large and have certain chemical corrosivity, so cleaning solution just can come into the market to sell after must packing.
With respect to the packing of other products, cleaning solution packing has high requirement to the intensity of packing material and corrosion resistance.This is because cleaning solution itself has certain chemical corrosivity, if packing material corrosion resistance is bad, its packing cleaning solution after a period of time easily by content cleaning solution swelling, cause leakage, and once cleaning solution leakage not only can cause the waste of this bag cleaning solution, the cleaning solution flowing out also can pollute other article around, causes other cleaning solution packed products also can not use.Therefore, the packing material of cleaning solution must have higher corrosion resistance.The same chemical corrosivity due to cleaning solution, if packing material undercapacity, easily in transportation, because colliding with each other, there is breakage, once packing material occurs damaged, cleaning solution leaks outside and can pollute other articless for washing in transport case, even causes FCL articles for washing to use, and causes tremendous economic loss, therefore, the packing material of cleaning solution also needs to have higher intensity.
Consider the above-mentioned requirement to cleaning solution packing material, mostly adopt in the market plastic bottle to pack cleaning solution.That plastic bottle has is corrosion-resistant, fragrance protectiveness good, the feature such as non-friable, but the volume of its empty bottle is large, capacity/volume ratio is little, if an overall volume is the plastic bottle of 1200 milliliters, approximately can pack the liquid of 1000 milliliters into, carry the plastic bottle of approximately 12 cubic metres, a truck can only pack the cleaning solution of 10 tons of weights into, cost of transportation is higher.In addition, the production technology of plastic bottle is also comparatively complicated.Therefore, adopt plastic bottle to pack cleaning solution, the production cost of Packaging Bottle and cost of transportation are all higher.
In order to reduce packing cost, prior art has the composite soft packaging of employing to pack cleaning solution.In bag technique, composite film material need to seal, and therefore existing cleaning solution adopts polyethylene (PE) film conventionally with the internal layer of laminated film, as adopted the structure of nylon (NY)/PE.Though existing cleaning solution packing can effectively increase with laminated film capacity/volume of packing, but after being sealed, adaptation is poor, hot strength is low, causes thus cleaning solution product that leakage easily occurred after use a period of time, falls rear easy generation bale broken.
Therefore, a kind of PE film that rear adaptation is high and hot strength is high that seals be need to provide, adaptation and the resistance to property fallen of packaging bag prepared therefrom improved thus.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of PE film, and this PE film has good heat sealability, has higher adaptation and hot strength after heat-sealing, improves thus anti-leakage and the resistance to drop performance of laminated film prepared therefrom.
In view of this, the invention provides a kind of polyethylene film, comprise successively: composite bed, intermediate layer and hot sealing layer;
Described composite bed comprises: the modified metallocene LLDPE of the low density polyethylene (LDPE) of 25wt%～40wt%, the LLDPE of 25wt%～40wt% and 33wt%～45wt%;
Described intermediate layer comprises: the low density polyethylene (LDPE) of 25wt%～50wt% and 50wt%～75wt% LLDPE;
Described hot sealing layer comprises: the low density polyethylene (LDPE) of 28wt%～35wt% and the LLDPE of 65wt%～72wt%.
Preferably, described intermediate layer also comprises: the look female of 0～22wt%.
The present invention also provides a kind of preparation method of above-mentioned polyethylene film, comprising: by the resin raw material of described composite bed, intermediate layer and hot sealing layer at 120 ℃～160 ℃ Coextrusion Blow Mouldings.
The present invention also provides a kind of cleaning solution packaging composite film, comprises successively: polyester layer, nylon layer and above-mentioned polyethylene layer, described nylon layer contacts with the composite bed of polyethylene layer.
Preferably, the Thickness Ratio of described polyester layer, nylon layer and polyethylene layer is 1: 1.2～1.5: 12～15.
The present invention also provides a kind of preparation method of above-mentioned laminated film, comprising:
Described polyethylene layer composite bed place face is carried out to sided corona treatment;
Adopt dry type composite algorithm, use adhesive successively described polyester layer, nylon layer and polyethylene layer to be carried out compound.
Preferably, described adhesive is PAUR.
Preferably, the operation concentration of described adhesive is to examine grace cup 17 seconds～20 seconds for No. 3.
The present invention also provides a kind of packaging bag for cleaning solution, comprising: the main bag body of being prepared by above-mentioned cleaning solution packaging composite film and the dop being connected with described main bag body heat-sealing.
Preferably, the material that described dop is is high density polyethylene (HDPE).
The invention provides a kind of PE film, this PE film comprises composite bed, intermediate layer and hot sealing layer successively, and composite bed comprises: composite bed has higher combined strength bination for guaranteeing PE film and other films, improves mechanical property and the solvent resistance of PE film; Intermediate layer comprises: the raw material that intermediate layer is selected and composite bed and hot sealing layer are same or similar, for guaranteeing that itself and composite bed and hot sealing layer have compared with high bond strength; Hot sealing layer comprises: hot sealing layer, for improving the resistance tocrocking of PE film, makes to have compared with high adhesion and heat seal strength after the heat-sealing of PE film.Therefore, adopt PE film provided by the invention to pack product, can make to be packaged in and there is certain solvent resistance, excellent heat sealability, guarantee that the material after heat-sealing has higher adaptation and hot strength intensity, and then improve anti-leakage and the resistance to property fallen of laminated film prepared therefrom.
The present invention also provides a kind of cleaning solution packaging composite film, it comprises polyester layer, nylon layer and above-mentioned PE layer successively, polyester layer has good printing adaptability and dimensional stability, nylon layer is given the good toughness of laminated film, tensile strength, percentage elongation, wearability and barrier, PE layer is for guaranteeing that laminated film has good heat sealability, after heat-sealing, adaptation is high, and hot strength is large, and then guarantees anti-leakage and the resistance to property fallen of laminated film.Therefore; laminated film provided by the invention has good mechanical property, heat-sealing adaptation and heat seal strength; adopt laminated film provided by the invention to pack cleaning solutions such as liquid detergent, softener, aromatic, deodorant, thimerosal and hand cleanser; can be content a good protection of the environment is provided; make to pack not easy-to-leak liquid of rear product; clashed into and stagger along after be difficult for there is bale broken, and then also avoided the cleaning solution after bale broken to reveal and polluted other products.
Accompanying drawing explanation
Fig. 1 is the structural representation of polyethylene film provided by the invention;
Fig. 2 is the structural representation of cleaning solution packaging composite film provided by the invention;
Fig. 3 is the structural representation of packing bag for detergent provided by the invention.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these are described is for further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The embodiment of the invention discloses a kind of polyethylene film, shown in Figure 1 is the structural representation of polyethylene film provided by the invention, and it comprises successively: composite bed 101, intermediate layer 102 and hot sealing layer 103.Wherein, composite bed 101 comprises: the modified metallocene LLDPE of the low density polyethylene (LDPE) of 25wt%～40wt%, the LLDPE of 25wt%～40wt% and 33wt%～45wt%; Intermediate layer 102 comprises: the low density polyethylene (LDPE) of 25wt%～50wt% and 50wt%～75wt% LLDPE; Hot sealing layer 103 comprises: the modified metallocene LLDPE of 28wt%～35wt% and the metallocene low density polyethylene (LDPE) of 65wt%～72wt%.
Due to polyethylene film strength and corrosion resistance limited, generally in order to improve thin film strength and corrosion resistance, need to polyethylene film and other films be carried out compound.In above-mentioned three layers of PE structure, composite bed is that PE film and other film carry out compound one deck, in order to improve the conjugation of PE film and other film, the present invention adds 25wt%～40wt% LLDPE (LLDPE) and 33wt%～45wt% modified metallocene LLDPE (m-LLDPE) in composite membrane, add and can improve itself and other film after the modification m-LLDPE of aforementioned proportion and LLDPE, the peel strength after especially compound with nylon (NY).
Meanwhile, LLDPE has higher percentage elongation and puncture resistance, improves thus hot strength and the puncture resistance of PE film; Modification m-LLDPE has excellent anti-fouling performance, with guarantee the combined strength bination of composite membrane and other film do not produced solvent and dust on machine etc. impact; Modification m-LLDPE also has higher heat seal strength and impact resistance, to improve the resistance to drop performance of PE film; In addition modification m-LLDPE also has good solvent resistance, makes it be suitable as the packing that cleaning solution etc. has chemical corrosivity product.For modification m-LLDPE, the present invention preferably adopts 5401 or the PL 1881 of the production that Dow Chemical provides.In addition, the present invention also to the 25wt%～40wt% low density polyethylene (LDPE) having added in composite membrane improving the processing characteristics of PE film.
Intermediate layer is the articulamentum of composite bed and hot sealing layer, the present invention is in order to guarantee the compactness of the combination of composite bed and hot sealing layer, consideration adds the raw material identical with composite bed and hot sealing layer in intermediate layer, but because modification m-LLDPE price is higher and itself and LLDPE structural similarity are higher, so the present invention uses the comparatively cheap LLDPE of price to substitute m-LLDPE in intermediate layer.The LDPE that in PE film of the present invention, hot sealing layer contains 28wt%～50wt% and the LLDPE of 50wt%～75wt%, owing to also containing LLDPE, LDPE and the modification m-LLDPE comparatively close with LLDPE structure in composite bed, so intermediate layer and composite bed have higher bond strength.Because hot sealing layer also contains LDPE and the modification m-LLDPE comparatively close with LLDPE structure, so intermediate layer and hot sealing layer also have higher bond strength, so the intermediate layer of mentioned component can guarantee between composite bed and hot sealing layer, to have higher conjugation.
The articulamentum of composite bed and hot sealing layer is not only in intermediate layer, can also be as dyed layer, according to need of production, the present invention also preferably adds the look mother of 0～22wt% to make PE film have required color in intermediate layer, in to intermediate layer, adds white mother can make PE film present milky.
Hot sealing layer is the one deck directly contacting with packing content thing, existing technology of the package is normally by backward its inner product-filledly seals again of packing film bag, in carrying out filling process, product is very easily attached to interior sealing surface, especially for cleaning solution etc., there is the product of chemical corrosivity, if be attached to adaptation and heat seal strength that hot sealing layer surface very easily affects follow-up heat-sealing operation.Therefore, the present invention adds the modification m-LLDPE up to 65wt%～72wt% in hot sealing layer, due to modification m-LLDPE, to have viscosity high, there is excellent antifouling property, hot sticky intensity and heat seal strength and good solvent resistance and impact resistance, therefore improve the solvent resistance of PE film, guarantee to there is higher adaptation and heat seal strength after the heat-sealing of PE film.Modification m-LLDPE in hot sealing layer also preferably selects 5401 or PL1881 of the production that Dow Chemical provides.The present invention also adds the LDPE of 28wt%～35wt% for improving the processing characteristics of PE film in hot sealing layer, and guarantees the conjugation in itself and intermediate layer.
The preparation method who the invention provides accordingly a kind of above-mentioned PE film, comprising: by the raw material of above-mentioned composite bed, intermediate layer and hot sealing layer at 120 ℃～160 ℃ Coextrusion Blow Mouldings.
The present invention preferably adds composite bed resin, intermediate layer resin and hot sealing layer resin respectively in three barrels of extruder, and each barrel is carried out to three sections of heating, it is 120 ℃～130 ℃ that one section of heating-up temperature of each barrel is preferably set, two sections of heating-up temperatures are 130 ℃～140 ℃, three sections of heating-up temperatures are 140 ℃～150 ℃, it is 140 ℃～160 ℃ that die head temperature is set, and controls melt extrusion pressure and is less than 45Mpa.Polymer particle in above-mentioned three barrels is through extruder melting and form pipe, after being stretched, pipe goes out compressed air from extruder die head center, pipe is blown into blister film, blister film is made to the PE film that comprises successively composite bed, intermediate layer and hot sealing layer simultaneously through the cooling sizing of vane cooling air.
From such scheme, PE film provided by the invention comprises composite bed successively, intermediate layer and hot sealing layer, composite bed and other films have higher combined strength bination, excellent mechanical property and higher solvent resistance, intermediate layer and composite bed and hot sealing layer have compared with high bond strength, hot sealing layer has excellent resistance tocrocking, after heat-sealing, have compared with high adhesion and heat seal strength, therefore adopt PE film provided by the invention to pack product, can make to be packaged in and there is certain solvent resistance, excellent heat sealability, guarantee that the material after heat-sealing has higher adaptation and hot strength intensity, and then improve anti-leakage and the resistance to property fallen of laminated film prepared therefrom, PE film provided by the invention is especially suitable for use as the packing of cleaning solution.
The present invention also provides a kind of cleaning solution packaging composite film by above-mentioned PE film preparation, shown in Figure 2 is the structural representation of cleaning solution packaging composite film provided by the invention, this laminated film comprises successively: polyester layer 3, nylon layer 2 and above-mentioned polyethylene layer 1, wherein nylon layer 2 contacts with the composite bed of polyethylene layer.
Polyester layer in above-mentioned laminated film is the outermost layer of laminated film, and it is one deck of carrying printing, and polyester has higher adhesive force to ink, has good printing adaptability, and it is not easy to change after heat-resisting yet.In addition, polyester also has higher dimensional stability, for guaranteeing, laminated film is carried out to following process, as carries out the dimensional stability of dop operation.
Nylon layer barrier property is good; there is in addition higher toughness, tensile strength, percentage elongation and wearability; because nylon absorbability is strong; rate of perviousness is large; therefore select the nylon intermediate layer of laminated film the most; for strengthening withstand voltage, the shock-resistant and resistance to drop performance of laminated film, and then well protect content.
Above-mentioned composite membrane PE layer for guaranteeing that laminated film has good heat sealability, after heat-sealing, adaptation is high, hot strength is large, and then guarantees anti-leakage and the resistance to property fallen of laminated film.In laminated film the Thickness Ratio of polyester layer, nylon layer and polyethylene layer be preferably 1: 1.2～1.5: 12～15, the polyester layer of aforementioned proportion, nylon layer and polyethylene layer can guarantee that it has good barrier and deflection has good heat sealability simultaneously.
Accordingly, the invention provides the preparation method of above-mentioned laminated film, it is first the composite bed place face of polyethylene film to be carried out to sided corona treatment, makes more than the wetting tension of this layer reaches 40 dyne, to make the conjugation (being peel strength) of PE film and other film better.Then successively polyester layer, nylon layer and polyethylene layer are carried out to dry type compound, make the compound aspect of polyethylene layer relative with nylon layer in compound, just obtain comprising successively the laminated film of polyester layer, nylon layer and polyethylene layer after compound.
The adhesive that dry type compound working procedure adopts need to have excellent resistance to chemical corrosion and have for a long time higher peel strength to guarantee each layer, the present invention is preferably Polyester polyurethane adhesive for this reason, adopts the operation concentration of above-mentioned adhesive to be preferably to examine for No. 3 grace cup 17 seconds～20 seconds.Adhesive more preferably adopts the UK3640 adhesive of Henkel KGaA company, the feature of this kind of adhesive be on strand except this polar structure of the carbamate of arranging regularly (NHOCOH-), also contain epoxy radicals (COC-), carboxyl (COOH-) and silane isocyano group (O=C=N-RSiR ') isoreactivity group.The epoxide group of introducing in this adhesive mainly can increase the resistance to chemical corrosion of adhesive, the introducing of silane isocyano group can increase adhesive and adhesion of thin film, therefore adopt this kind of adhesive can effectively solve the problem of composite membrane corrosion resistance, can improve again the peel strength of composite construction.
From such scheme; because above-mentioned laminated film has good mechanical property, heat-sealing adaptation and heat seal strength; therefore adopt laminated film provided by the invention to pack cleaning solutions such as liquid detergent, softener, aromatic, deodorant, thimerosal and hand cleanser; can be content a good protection of the environment is provided; make to pack not easy-to-leak liquid of rear product; clashed into and stagger along after be difficult for there is bale broken, and then also avoided the cleaning solution after bale broken to reveal and polluted other products.
Apply above-mentioned laminated film, the present invention also provides a kind of packaging bag of cleaning solution, shown in Figure 3 is the structural representation of packing bag for detergent provided by the invention, it comprises: main bag body 4 and the dop 5 being connected with described main bag body heat-sealing, wherein main bag body 4 is made by above-mentioned laminated film, and dop 5 preferably selects high density polyethylene (HDPE) (HDPE) to have good mechanical property and the adaptation higher with main bag body to guarantee dop.Can be according to method processing well known to those skilled in the art for bag technique, specifically will divide the composite membrane film volume cutting according to customer requirement, to make the flat folder main bag body at the end by three side sealing bag machines, and then after using clamping mouth machine that dop is put into main bag body sack, itself and main bag body are sealed, obtain dop finished bag, finally by the bin storage of just can casing after the cooling leveling of the packaging bag making.
Packing bag for detergent provided by the invention comprises main bag body and dop, main bag body has good mechanical property, with dop heat-sealing with after after being filled into product, all there is higher adaptation and heat seal strength, the resistance to drop performance of product is good, clashed into and stagger along after be difficult for there is bale broken, avoided thus the cleaning solution after bale broken to reveal and polluted other products.In packaging bag, arrange dop can realize repeat to open closely sealed, easy to use.
In order further to understand the present invention, below in conjunction with embodiment, polyethylene film provided by the invention, cleaning solution packaging composite film and packing bag for detergent are described.Protection scope of the present invention is not limited by the following examples.
LDPE in following examples is the TN00 that Sinopec Group provides, LLDPE is the 1002YB that Exxon Corporation provides, modification m-LLDPE be that Dow Chemical provides 5401, white mother is the UF880 that Dainippon Ink Chemicals provides, and adhesive is the UK3640 that Henkel KGaA company provides.
In three barrels of coextrusion machine, add respectively composite bed resin raw material, intermediate layer resin raw material and hot sealing layer resin raw material, each resin raw material formula is as follows:
The LDPE of composite bed: 32wt%, the LLDPE of 32wt% and 36wt% modification m-LLDPE;
The white of the LDPE of intermediate layer: 30wt%, the LLDPE of 60wt% and 10wt% is female;
The LDPE of hot sealing layer: 31wt% and the LLDPE of 69wt%.
Polymer particle in above-mentioned three barrels is through extruder melting and form pipe, after being stretched, pipe goes out compressed air from extruder die head center, pipe is blown into blister film, blister film is made to PE film through the cooling sizing of vane cooling air simultaneously, extruder technical parameter is set referring to table 1.
The difference of the present embodiment and embodiment 1 is the resin raw material of composite bed, intermediate layer and hot sealing layer, and each layer of resin raw material formula of the present embodiment is as follows:
The LDPE of composite bed: 28wt%, the LLDPE of 29wt% and 43wt% modification m-LLDPE;
The white of the LDPE of intermediate layer: 26wt%, the LLDPE of 58wt% and 16wt% is female;
The LDPE of hot sealing layer: 35wt% and the LLDPE of 65wt%.
Extruder technical parameter is set identical with embodiment 1.
The difference of the present embodiment and embodiment 1 is the resin raw material of composite bed, intermediate layer and hot sealing layer, and each layer of resin raw material formula of the present embodiment is as follows:
The LDPE of composite bed: 35wt%, the LLDPE of 30wt% and 35wt% modification m-LLDPE;
The LDPE of intermediate layer: 35wt% and the LLDPE of 65wt%;
The LDPE of hot sealing layer: 30wt% and the LLDPE of 70wt%.
Extruder technical parameter is set identical with embodiment 1.
The PE film of embodiment 1～3 preparation is carried out to heat sealability and Mechanics Performance Testing, and test result is listed in table 2.
1, the composite bed place face of the PE film of embodiment 1 preparation is carried out to sided corona treatment, adopt dry compound machine by the PE film after polyester film, nylon membrane and sided corona treatment and carry out successively compound, during compound tense, nylon membrane is relative with PE film composite bed, it is to examine grace cup 17s～20s for No. 3 that the operation concentration of adhesive is controlled, baking temperature is 70 ℃, compounding machine speed is 130m/min, obtains comprising successively the laminated film of polyester layer, nylon layer and PE layer after compound.The thickness of polyester layer, nylon layer and PE layer is respectively 12mm, 15mm and 160mm.Mechanical property and the barrier property of the laminated film that test the present embodiment makes are listed in table 3.
2, laminated film step 1 being made is cut rolling film, will divide the volume film cutting to make the flat folder finished bag at the end by three side sealing bag machines.
3, itself and main bag body are sealed after HDPE dop being put into finished bag sack with clamping mouth machine, obtain dop finished bag.
4, in the dop finished bag making to step 3, be filled into liquid detergent, dop finished bag opening is sealed, obtain the packaging bag that contains liquid detergent.The mechanical property of test pack pack is listed in table 4.
The difference of the present embodiment and embodiment 4 is to use PE film for the PE film of embodiment 2 preparations, and other operations are identical with embodiment 4.Mechanical property and the barrier property of the laminated film that test the present embodiment makes are listed in table 3.The mechanical property of the packaging bag that test the present embodiment makes is listed in table 4.
Embodiment 6
The difference of the present embodiment and embodiment 4 is to use PE film for the PE film of embodiment 3 preparations, and other operations are identical with embodiment 4.Mechanical property and the barrier property of the laminated film that examination the present embodiment makes are listed in table 3.The mechanical property of the packaging bag that test the present embodiment makes is listed in table 4.
Extruder technical parameter is set in table 1 embodiment 1～3
Heat sealability and the mechanical experimental results of the PE film of table 2 embodiment 1～3 preparation
The mechanical property of the laminated film that table 3 embodiment 4～6 makes and barrier property test result
The packaging bag mechanical experimental results that table 4 embodiment 4～6 makes
From above-mentioned test data, laminated film provided by the invention has compared with high barrier, mechanical property and heat sealability, the packing bag for detergent of making of laminated film has higher withstand voltage properties and drop performance thus, clashed into and stagger along after be difficult for there is bale broken, avoided thus the cleaning solution after bale broken to reveal and polluted other products.
The explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a polyethylene film, is characterized in that, comprises successively: composite bed, intermediate layer and hot sealing layer;
Described composite bed comprises: the modified metallocene LLDPE of the low density polyethylene (LDPE) of 25wt%～40wt%, the LLDPE of 25wt%～40wt% and 33wt%～45wt%;
Described intermediate layer comprises: the low density polyethylene (LDPE) of 25wt%～50wt% and 50wt%～75wt% LLDPE; Described intermediate layer also comprises: the look female of 0～22wt%;
Described hot sealing layer comprises: the low density polyethylene (LDPE) of 28wt%～35wt% and the LLDPE of 65wt%～72wt%;
The preparation method of described polyethylene film comprises: by the resin raw material of described composite bed, intermediate layer and hot sealing layer at 120 ℃～160 ℃ Coextrusion Blow Mouldings.
2. a cleaning solution packaging composite film, is characterized in that, comprises successively: polyester layer, nylon layer and polyethylene film claimed in claim 1, described nylon layer contacts with the composite bed of polyethylene film.
3. cleaning solution packaging composite film according to claim 2, is characterized in that, the Thickness Ratio of described polyester layer, nylon layer and polyethylene film is 1:1.2～1.5:12～15.
4. a method of preparing cleaning solution packaging composite film as claimed in claim 2, comprising:
Described polyethylene film composite bed place face is carried out to sided corona treatment;
Adopt dry type composite algorithm, use adhesive successively described polyester layer, nylon layer and polyethylene film to be carried out compound.
5. preparation method according to claim 4, is characterized in that, described adhesive is PAUR.
6. preparation method according to claim 5, is characterized in that, the operation concentration of described adhesive is to examine grace cup 17 seconds～20 seconds for No. 3.
7. for a packaging bag for cleaning solution, it is characterized in that, comprising: main bag body and the dop being connected with described main bag body heat-sealing, wherein main bag body is made by cleaning solution packaging composite film described in claim 2.
8. the packaging bag for cleaning solution according to claim 7, is characterized in that, the material of described dop is high density polyethylene (HDPE).
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