CN101274690A - Thinned high-barrier liquid packaging film and manufacturing method thereof - Google Patents
Thinned high-barrier liquid packaging film and manufacturing method thereof Download PDFInfo
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- CN101274690A CN101274690A CNA2008101124237A CN200810112423A CN101274690A CN 101274690 A CN101274690 A CN 101274690A CN A2008101124237 A CNA2008101124237 A CN A2008101124237A CN 200810112423 A CN200810112423 A CN 200810112423A CN 101274690 A CN101274690 A CN 101274690A
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Abstract
The invention relates to a thin-reducing and high impermeable liquid packaging membrane and a manufacturing method thereof. The product comprises a polyvinyl basilar membrane, a high impermeable polyvinyl alcohol layer, a composite adhesive layer and a protective polythene membrane layer, wherein, the polyvinyl basilar membrane comprises an outer layer, a middle layer and an inner layer and the outer layer and the middle layer comprise at least one of the two materials which are medium-density polythene or high-density polythene. The manufacturing method of the product comprises the steps of the preparation of the polyvinyl basilar membrane, the preparation of polyvinyl alcohol coating liquid and the preparation of the protective polythene membrane layer, coating and compounding, wherein, the polyvinyl alcohol coating liquid is diluted and the diluted polyvinyl alcohol coating liquid is coated on the outer layer of the polyvinyl basilar membrane to form the high impermeable polyvinyl alcohol layer and then the protective polythene member layer and the polyvinyl alcohol coating layer are compounded, cured and cut. The product of the invention has low thickness, good rigidness, high impermeable property, environmental protection, convenient use, low cost and simple technique.
Description
Technical field
The present invention relates to a kind of thinned high-barrier liquid packaging film and manufacture method thereof, particularly relate to a kind of attenuate type polyethylene, polyvinyl alcohol high-barrier liquid packaging film and manufacture method thereof.
Background technology
Along with being growing more intense of food liquid market competition and rising steadily of packaging raw materials for plastics production price, food liquid manufacturer requires more and more higher to the productive costs and the oxygen barrier fresh keeping property of packaging plastic package material, how to reduce the productive costs of packing, can prolong the shelf-life and the shelf life of content again, satisfying the packing liquid food product requirement, is one of current liquid food packing material field problem demanding prompt solution.
The liquid packaging film of Shi Yonging mostly adopts high pressure polyethylene (LDPE) and linear low density polyethylene (LLDPE) and polyethylene is black, white master material produces through the coextrusion film blowing unit in the market.Because the restriction of LDPE, the performance of LLDPE material own, rigidity is relatively poor.Use the very requirement of degree of expansion for satisfying wrapping machine, have only and adopt the way that improves thickness to compensate its defect, so packaging film thickness generally is controlled at more than 90 microns, be difficult to attenuate again, and resistance oxygen fresh keeping property is undesirable.
Also have commonly used be adopt in the middle of high barrier material such as polyvinylidene chloride (PVDC), ETHYLENE-VINYL ALCOHOL COPOLYMER thing (EVOH), polyamide (PA) etc. and LLDPE, the LDPE bonding by adhering resin, finish through coextrusion blown film unit more than five layers or five layers, reached the fresh-keeping effect of resistance oxygen, but the corresponding apparatus investment is too big, and productive costs is high.
Again by being exactly polyethylene (PE) the class basement membrane that adopts LDPE+LLDPE to form through coating one deck high barrier material such as polyvinyl alcohol (PVA), PVDC, EVOH, nano-inorganic substance etc., polyvinyl alcohol has good film forming and intercepts the characteristic of gas, compare with PA, EVOH, PVDC, PET etc., productive costs is lower.But because polyvinyl alcohol is a kind of water soluble resin, poor water resistance, the gas barrier properties straight line descends under super-humid conditions.If coating one deck modified polyvinylalcohol on polyethylene based film; use the better rigidity material as protective cover again; flake aluminum for example; aluminizer; polyethylene terephthalate (PET); chlorinated polypropylene (CPP); Biaxially oriented polypropylene (BOPP) etc.; can keep the barrier property of complex film under certain humidity; improve rigidity simultaneously; and film forming thickness is lower; really has progressive; but when using, reality but finds also to have in its structure some shortcomings; cause this high-barrier liquid packaging film in practical application; fail to reach best result of use, and its shortcoming can be summarized as follows:
1, the employed polyethylene foil poor rigidity of its basement membrane so must adopt the higher material of price such as PET, BOPP, CPP, aluminizer of good rigidly to compensate its defect as protective cover, has increased productive costs;
2, basement membrane is different with the used raw material characteristics of protective cover film, and each layer film serviceability temperature difference is big, is prone to the situation of wire drawing, company's bag in actual production, causes breakage rate to increase;
3, because the use of horizontal sealing temperature is higher, the horizontal sealing die head keeps high temperature for a long time, has shortened the service life of wrapping machine;
4, because the material serviceability temperature difference that adopts cannot reclaim basically, the pernicious gas that produces during burning is unfavorable for environmental protection.
This shows that above-mentioned existing high-barrier liquid packaging film obviously still has inconvenience and defective, and demands urgently further being improved producing and using.How to found a kind ofly have thinner thickness concurrently, rigidity is better, barrier is high, be beneficial to environmental protection, easy to use and cost is low, simple new thinned high-barrier liquid packaging film and the manufacture method thereof of technology, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing high-barrier liquid packaging film and manufacture method thereof exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and expertise, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of new thinned high-barrier liquid packaging film and manufacture method thereof, can improve general existing high-barrier liquid packaging film and manufacture method thereof, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing high-barrier liquid packaging film exists, and provide a kind of new thinned high-barrier liquid packaging film, technical matters to be solved be make its thinner thickness, rigidity is better, barrier is high, be beneficial to environmental protection and easy to use, thereby be suitable for practicality more.
Another object of the present invention is to, overcome the defective of the manufacture method existence of existing high-barrier liquid packaging film, and provide a kind of manufacture method of new thinned high-barrier liquid packaging film, technical matters to be solved is to make it reduce production costs, simplify production technology, thereby is suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of thinned high-barrier liquid packaging film according to the present invention's proposition; its bottom-up polyethylene based film, polyvinyl alcohol high-obstruction, composite adhesive layer and polyethylene film protective cover of comprising successively; wherein this polyethylene based film comprises skin, middle level and internal layer, comprise in its ectomesoderm and the middle level medium density polyethylene or high density polyethylene (HDPE) at least one of them.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid thinned high-barrier liquid packaging film, described polyethylene film protective cover comprises skin, middle level and internal layer, its ectomesoderm comprises nano organic montmorillonite.
Aforesaid thinned high-barrier liquid packaging film, its gross thickness are the 65-75 micron, and preferred thickness is the 70-75 micron.
It is 30-52% that aforesaid thinned high-barrier liquid packaging film, the skin of described polyethylene based film comprise the percentum that medium density polyethylene or high density polyethylene (HDPE) or the compound of the two account for this skin total weight; It is 30-60% that the middle level of polyethylene based film comprises the percentum that medium density polyethylene or high density polyethylene (HDPE) or the two compound account for this middle level total mass.
Aforesaid thinned high-barrier liquid packaging film, the skin of described polyethylene based film also comprise polybutene or polyisobutene 0-5%.
Aforesaid thinned high-barrier liquid packaging film, the skin of described polyethylene based film also comprise linear low density polyethylene, polyethylene white mother and polybutene; The middle level of polyethylene based film also comprises metallocene linear-low density polyethylene; The internal layer of polyethylene based film comprises high pressure polyethylene, linear low density polyethylene and metallocene linear-low density polyethylene; Described polyvinyl alcohol high-obstruction comprises polyvinyl alcohol, reinforcement tackifier, inhibiter and water; The skin of described polyethylene film protective cover, middle level, internal layer also comprise linear low density polyethylene and high pressure polyethylene.
Aforesaid thinned high-barrier liquid packaging film, described polyethylene based film middle level also comprise linear low density polyethylene, polyethylene white mother or polyethylene black masterbatch; The polyvinyl film inner layer also comprises the polyethylene black masterbatch; Described polyvinyl alcohol high-obstruction also comprises the light stabilizer that accounts for polyvinyl alcohol high-obstruction total mass percentum 0-3% and the fixer of 0-5%; Described inhibiter is silanes or titanate ester; The reinforcement tackifier are nano kaoline, nanometer lithium magnesium silicate, nano imvite or its compound.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of method of making aforementioned thinned high-barrier liquid packaging film that the present invention proposes, it comprises following processing step: the preparation of polyethylene based film: the preparation of PVA paint; The preparation of polyethylene film protective cover; Coating, compound, it comprises the dilution PVA paint, the skin of the PVA paint that diluted being coated polyethylene based film forms the polyvinyl alcohol high-obstruction, and polyethylene film protective cover and polyvinyl alcohol high-obstruction is compound; Slaking, cut.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The manufacture method of aforesaid thinned high-barrier liquid packaging film, the preparation of described PVA paint is to be that the reinforcement tackifier of polyvinyl alcohol, the 1-5% of 15-22%, the inhibiter of 0.5-2% and the water of 71-83.5% mix with percentage by weight, in the heating reactor, stir, be dissolved into clear solution in 90-95 ℃, be cooled to 50-60 ℃.
The manufacture method of aforesaid thinned high-barrier liquid packaging film, described dilution PVA paint are that usefulness is heated to 50-60 ℃ quick dry agent and the mixed solution of water dilutes, and stir more than 2 hours, filter with 100～200 mesh filter screens; Wherein quick dry agent is normal propyl alcohol, ethanol, methyl alcohol or its compound.
The present invention compared with prior art has tangible advantage and beneficial effect, and has the extensive value on the industry, and it has following advantage at least:
1, thinned high-barrier liquid packaging film good rigidly of the present invention, thin thickness, it utilizes medium density polyethylene (MDPE) and high density polyethylene (HDPE) (HDPE) to form the better rigidity basement membrane, utilize coating process to form thin polyvinyl alcohol high-obstruction, as long as the product thinned high-barrier liquid packaging film is the 65-75 micron, even gross thickness is reduced to the 65-70 micron, still have preferably very expansion property, can meet the operating needs of the fresh-keeping and bottle placer of the oxygen barrier of food liquid.
2, thinned high-barrier liquid packaging film superior performance of the present invention, PVA paint does not adopt auxiliary agents such as plasticizer, crosslinking agent, antioxidant, catalyst basically, improve the purity of PVA effectively, increase film compactness, thereby improve the barrier property of film; Utilize nano layered silicate modified PVA paints such as nano kaoline or nano imvite, further strengthened the barrier property of film materials such as oxygen, water vapours; Utilize the good elasticity of LDPE to increase the puncture resistance of film; Further improve the gas barrier effect at the outer nano organic montmorillonite that adds of protective cover, effectively reduce the transit dose of oxygen, water vapour, prolong effective period of food quality and shelf life; Utilize polybutene or polyisobutene high viscosity and with sub polyethylene from characteristic, improve compound fastness and basement membrane purity simultaneously.
3, the raw material of thinned high-barrier liquid packaging film employing of the present invention is the polyethylene kind material more than 90%, is convenient to recycling, need not to burn, and is beneficial to environmental protection.
4, thinned high-barrier liquid packaging film of the present invention is easy to use, when envelope is cut on wrapping machine, and easy control of temperature, wire drawing can not occur, connect the bag phenomenon, reduced breakage rate effectively, and avoided having prolonged the service life of wrapping machine because of the higher infringement that causes to wrapping machine of horizontal sealing temperature.
5, the employed feed stock cost of the manufacture method of thinned high-barrier liquid packaging film of the present invention is low, and equipment investment is few, and production technology is simple, the production efficiency height.
In sum, thinned high-barrier liquid packaging film of the present invention and manufacture method thereof, product thickness is thin, rigidity is better, barrier is high, be beneficial to environmental protection, easy to use and productive costs is low, technology is simple.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on properties of product, manufacture method, obvious improvement is arranged technically, and produced handy and practical effect, and more existing high-barrier liquid packaging film and manufacture method thereof have the outstanding multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification sheets, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to thinned high-barrier liquid packaging film and its specific embodiment of manufacture method, product structure, manufacture method, step, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
About the manufacture method of thinned high-barrier liquid packaging film of the present invention, its primary raw material and step are as follows:
1, the preparation of polyethylene based film.
Polyethylene based film of the present invention by outer, in, interior three layers constitute, its separately composition of raw materials be (percentage by weight)
Outer MDPE or HDPE or both arbitrary proportion compound 30-52
LLDPE 15-60
The female 10-28 of PE white
Polybutene (PB) 0-5
Middle level MDPE or HDPE or both arbitrary proportion compound 30-60
LLDPE 0-20
Metallocene linear-low density polyethylene (mPE) 25-40
The female 0-15 of PE white
PE black masterbatch 0-10
Internal layer LDPE 25-40
LLDPE 10-25
mPE 40-50
PE black masterbatch 0-10
Take by weighing the each component raw material by above-mentioned prescription, after stirring, add three-layer co-extruded each hopper that goes out inflation film manufacturing machine on request respectively, under plasticization temperature 155-200 ℃ condition, the blowing film forming reaches the 38-42 dyne through the corona treatment surface tension, cuts to batch by specification to get final product.The thickness of polyethylene based film can be the 43-53 micron among the present invention, preferred 48-53 micron.
2, the preparation of PVA paint.
Component and prescription (percentage by weight)
Polyvinyl alcohol 15-22
Reinforcement tackifier 1-5
Inhibiter 0.5-2
Water 71-83.5
In addition, also can comprise light stabilizer, fixer etc.Light stabilizer is benzophenone or salicylic acid ester class, and the two is optional, accounts for the 0-3% of total mass, and fixer is a polyalcohols, accounts for the 0-5% of total mass.
Above-mentioned inhibiter is silanes or titanate ester; The reinforcement tackifier are nano kaoline, nanometer lithium magnesium silicate, nano imvite etc., or its compound.
Nano layered silicate modified polyethylene such as nano kaoline of the present invention or nano imvite alcohol coating fluid is compared with nano-silicon dioxide modified PVA paint, the nano particle of silicon dioxide is a chondritic, and the nano particle of nano layered silicates such as kaolin or polynite is a laminar texture, the mutual intercalation of nano flake, increased the crooked road that oxygen, water vapour etc. pass through, intercept gas performance and be higher than nano silicon, effect is better; Nano layered silicate such as nano kaoline or nano imvite is suspended in water, nano silicon must be used organic solvent dissolution, organic solvent that it adopted such as boiling points such as methyl alcohol, ethanol all are lower than 80 ℃, the polyvinyl alcohol fusing point is 90～95 ℃, organic solvent consumes totally substantially when polyvinyl alcohol dissolves fully like this, and coating fluid of the present invention is not in process of production not with an organic solvent, has avoided the loss waste, has reduced productive costs; Simultaneously, the cost of material of nano kaoline is well below the cost of material of nano silicon, only have its 1/4th, even lower, it is very considerable that cost reduces amplitude.
Take by weighing by above-mentioned prescription and to account for total weight 15-22% polyvinyl alcohol, the water of 71-83.5%, the reinforcement tackifier of 1-5%, the inhibiter of 0.5-2% stirs in the heating reactor, is dissolved into clear solution in 90-95 ℃, is cooled to 50-60 ℃.
3, the preparation of polyethylene film protective cover.
Component and prescription (percentage by weight)
Outer LLDPE 55-75
LDPE 25-40
Nano organic montmorillonite 0-5
Middle level LLDPE 60-75
LDPE 25-40
Internal layer LLDPE 60-75
LDPE 25-40
Take by weighing the each component raw material by above-mentioned prescription, go out inflation film manufacturing machine under technological temperature 150-200 ℃ condition with three-layer co-extruded, the blowing film forming after the corona treatment surface tension reaches the 38-42 dyne, is cut to batch and is got final product.The thickness of polyethylene film protective cover can be the 15-30 micron among the present invention, preferred 18-22 micron.
4, coating, printing, compound.
Solid content as required takes by weighing quick dry agent, water is formed mixed solution, is heated to 50-60 ℃, is used to dilute the above-mentioned PVA paint for preparing, and stirs more than 2 hours, after filtering with 100～200 mesh filter screens, promptly can be used for coating.
Described quick dry agent can be normal propyl alcohol, ethanol, methyl alcohol or its compound.
Coat the polyethylene based film skin with the coating fluid of coating machine after with above-mentioned dilution, coating speed 50-100 rice/minute, adopt the high temperature coating can effectively guarantee the viscosity conformability of PVA coating fluid, guarantee the coating uniformity, promptly form the polyvinyl alcohol high-obstruction after the 70-100 ℃ of drying, the high-obstruction thickness of pva coating is about the 1-7 micron among the present invention, preferred 3-5 micron.
Can be as required on coating layer or corresponding coating layer one side surface of protective cover printed patterns or literal.
By adhesion agent that the skin and the high-obstruction of polyethylene film protective cover is compound with the dry compound machine group, adhesive layer thickness is the 1-3 micron, recombination velocity 40-150 rice/minute, baking temperature is 50-90 ℃.
PVA paint of the present invention adopts and heats water to 90-95 ℃ of dissolve polyvinyl alcohol earlier, and cooling adds the technology of component solvent dilution then, can effectively reduce loss waste at high temperature such as normal propyl alcohol, ethanol.
5, slaking, cut.
Thinned high-barrier liquid packaging film of the present invention reaches 35 degree at temperature and adopts nature slaking 24-72 hour when above, and temperature is lower than 35 and adopts the curing chamber slaking when spending, and curing temperature 35-50 degree after curing time 12-48 hour, can be cut.
Below enumerate the part specific embodiment, the oxygen transit dose of its product and steam permeable amount are to be detected according to QB1231-91 " liquid packing polyethylene blown film standard " by the national environmental protection center.
Specific embodiment one
Going out the blown film unit with plastic co-extrusion, to produce thickness be 50 microns polyethylene based film hot sealing layer, and the percentage by weight of each component be a skin: MDPE 45%, LLDPE 40%, PB 3%, PE white master material 12%; Middle level: MDPE 55%, PE white mother 15%, mPE 30%; Internal layer: LDPE 35%, mPE 45%, LLDPE 13.5%, PE black masterbatch 6.5%.Carry out treatment surface tension force with corona treatment and reach the 38-42 dyne.
Be coated with 0.6g/m with dry compound machine (having coating and complex function) at polyethylene based film hot sealing layer skin
2Polyvinyl alcohol, the proportioning of poly-vinyl alcohol solution each component is: polyvinyl alcohol 18.7%, reinforcement tackifier 2.5%, inhibiter 0.93%, water 77.87%.
With computer full automaticity intaglio press at the required pattern of polyethylene coating surface printing, literal etc.
Going out the blown film unit with plastic co-extrusion, to produce thickness be 22 microns polyethylene film protective cover, and the each component ratio be a skin: LDPE 30%, LLDPE 65%, nano imvite 5%; Middle level: LDPE 30%, LLDPE 70%; Internal layer: LDPE 35%, LLDPE 65%; Reach the 38-42 dyne through the corona treatment surface tension.
With the polyethylene film protective cover outer with the polyvinyl alcohol coating layer, compound with dry compound machine, the film after compound was sent into 35-45 ℃ curing room slaking after 24 hours, can cut.
This product is used for flexible package punchs such as liquid milk, and this film gross thickness is 73 microns, and the oxygen transit dose is 0.73cm
3/ m
2, 24h01mPa, steam penetrating capacity are 0.5g/m
2.24h.
Specific embodiment two
Going out the blown film unit with plastic co-extrusion, to produce thickness be 52 microns polyethylene based film hot sealing layer, and the weight proportion of each component be a skin: MDPE 45%, LLDPE 43%, PE white master material 12%; Middle level: MDPE 50%, PE white mother 14%, mPE 36%; Internal layer: LDPE 35%, mPE 45%, LLDPE14%, PE black masterbatch 6%.Carry out treatment surface tension force with corona treatment and reach the 38-42 dyne.
Be coated with 0.60g/m with dry compound machine at polyethylene based film hot sealing layer skin
2Polyvinyl alcohol, the proportioning of poly-vinyl alcohol solution each component is: polyvinyl alcohol 17.4%, reinforcement tackifier 1.35%, inhibiter 0.65%, water 80.6%.
Going out the blown film unit with plastic co-extrusion, to produce thickness be 22 microns polyethylene film protective cover, and the each component ratio be a skin: LDPE 35%, LLDPE 62%, nano organic montmorillonite 3%; Middle level: LDPE 25%, LLDPE 75%; Internal layer: LDPE 30%, LLDPE 70%; Reach the 38-42 dyne through the corona treatment surface tension.
Need pattern, literal etc. with computer full automaticity flexible printing machine printshop on polyethylene film protective cover skin.
With polyethylene film protective cover skin and polyethylene coating, compound with dry compound machine, the film after compound was sent into 35-45 ℃ curing room slaking after 18-24 hour, can cut.
This product can be used for flexible package punchs such as liquid milk, and this film gross thickness is 75 microns, and the oxygen transit dose is 1.76cm
3/ m
2, 24h01mPa, steam penetrating capacity are 0.83g/m
2.24h.
Specific embodiment three
Going out the blown film unit with plastic co-extrusion, to produce thickness be 44 microns polyethylene based film hot sealing layer, and the weight proportion of each component be a skin: HDPE 45%, LLDPE 41%, PE white master material 14%; Middle level: MDPE 50%, PE white mother 15%, mPE 35%; Internal layer: LDPE 30%, mPE 50%, LLDPE13.5%, PE black masterbatch 6.5%.Carry out treatment surface tension force with corona treatment and reach the 38-42 dyne.
Be coated with 0.65g/m with dry compound machine at polyethylene based film hot sealing layer skin
2PVA paint, the proportioning of poly-vinyl alcohol solution each component is: polyvinyl alcohol 18.9%, reinforcement tackifier 3.8%, inhibiter 1.5%, water 75.8%.
With computer full automaticity intaglio press at the required pattern of polyethylene coating surface printing, literal.
Going out the blown film unit with plastic co-extrusion, to produce thickness be 20 microns polyethylene film protective cover, and the each component ratio be a skin: LDPE 40%, LLDPE 55%, nano organic montmorillonite 5%; Middle level: LDPE 25%, LLDPE 75%; Internal layer: LDPE 25%, LLDPE 75%; Reach the 38-42 dyne through the corona treatment surface tension.
With the polyethylene film protective cover outer with the polyvinyl alcohol coating layer, compound with dry compound machine, the film after compound was sent into 35-45 ℃ curing room slaking after 18 hours, can cut.
This product can be used for flexible package punchs such as liquid milk, and this film gross thickness is 65 microns, and the oxygen transit dose is 0.9cm
3/ m
2, 24h01mPa.Steam penetrating capacity is 0.62g/m
2.24h.
Specific embodiment four
Going out the blown film unit with plastic co-extrusion, to produce thickness be 50 microns polyethylene based film hot sealing layer, and the weight proportion of each component be outer: MDPE 30%, LLDPE 57%, PE white mother 10%, PB 3%; Middle level: HDPE 60%, PE white mother 12%, mPE 28%; Internal layer: LDPE 35%, mPE 40%, LLDPE 25%.Carry out treatment surface tension force with corona treatment and reach the 38-42 dyne.
Be coated with 0.65g/m with dry compound machine at polyethylene based film hot sealing layer skin
2Polyvinyl alcohol, the proportioning of poly-vinyl alcohol solution each component is: polyvinyl alcohol 15%, reinforcement tackifier 2%, inhibiter 0.9%, water 82.1%.
Need pattern, literal etc. in polyethylene film protective cover superficies printshop with computer full automaticity flexible printing machine.
Going out the blown film unit with plastic co-extrusion, to produce thickness be 20 microns polyethylene film protective cover, and the each component ratio be a skin: LDPE 25%, LLDPE 70%, nano organic montmorillonite 5%; Middle level: LDPE 30%, LLDPE 70%; Internal layer: LDPE 40%, LLDPE 60%; Reach the 38-42 dyne through the corona treatment surface tension.
With polyethylene film protective cover skin and polyethylene coating, compound with dry compound machine, the film after compound was sent into 35-45 ℃ curing room slaking after 12 hours, can cut.
This product can be used for flexible package punchs such as fruit drink, and this film gross thickness is 70 microns, and the oxygen transit dose is 0.56cm
3/ m
2, 24h01mPa, steam penetrating capacity are 0.32g/m
2.24h.
Specific embodiment five
Going out the blown film unit with plastic co-extrusion, to produce thickness be 53 microns polyethylene based film hot sealing layer, and the weight proportion of each component be outer: HDPE 40%, LLDPE 45%, PE white mother 12%, PB 3%; Middle level: HDPE 40%, PE white mother 12%, LLDPE 18%, mPE 30%; Internal layer: LDPE 35%, mPE 40%, LLDPE 23%, PE black masterbatch 2%.Carry out treatment surface tension force with corona treatment and reach the 38-42 dyne.
Be coated with 0.6g/m with dry compound machine at polyethylene based film hot sealing layer skin
2Polyvinyl alcohol, the proportioning of poly-vinyl alcohol solution each component is: polyvinyl alcohol 22%, reinforcement tackifier 0.5%, inhibiter 0.2%, water 77.3%.
With computer full automaticity intaglio press at the required pattern of polyethylene coating surface printing, literal.
Going out the blown film unit with plastic co-extrusion, to produce thickness be 20 microns polyethylene film protective cover, and the each component ratio be a skin: LDPE 30%, LLDPE 70%; Middle level: LDPE 30%, LLDPE 70%; Internal layer: LDPE 30%, LLDPE 70%; Reach the 38-42 dyne through the corona treatment surface tension.
The printed layers of the polyethylene film protective cover is outer and polyvinyl alcohol, compound with dry compound machine, the film after compound was sent into 35-45 ℃ curing room slaking after 18 hours, can cut.
This product can be used for packings such as seasonings, and this film gross thickness is that 75 microns oxygen transit doses are 5.63cm
3/ m
2, 24h01mPa, steam penetrating capacity are 2.3g/m
2.24h.
Thinned high-barrier liquid packaging film of the present invention and manufacture method thereof are to be basement membrane with attenuate type polyethylene film, in this basement membrane, outer MDPE or HDPE or MDPE, the HDPE compound of adopting, has rigidity preferably, on basement membrane, compound again one deck modified poly ethylene film protective cover forms with the modified polyvinylalcohol solution coat; This complex film has ultrathin and the excellent oxygen barrier fresh keeping property that existing polyethylene liquid packaging film is not had, and film compactness, stability, fastness to water show all good, the high obstructing performance of oxygen is not subjected to the influence of ambient humidity, is the desirable packing of food liquid such as liquid milk, beverage, seasonings.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1, a kind of thinned high-barrier liquid packaging film is characterized in that its bottom-up polyethylene based film, polyvinyl alcohol high-obstruction, composite adhesive layer and polyethylene film protective cover of comprising successively, wherein
This polyethylene based film comprises skin, middle level and internal layer, comprise in its ectomesoderm and the middle level medium density polyethylene or high density polyethylene (HDPE) at least one of them.
2, thinned high-barrier liquid packaging film according to claim 1 is characterized in that described polyethylene film protective cover comprises skin, middle level and internal layer, and its ectomesoderm comprises nano organic montmorillonite.
3, thinned high-barrier liquid packaging film according to claim 1 is characterized in that its gross thickness is the 65-75 micron, and preferred thickness is the 70-75 micron.
4, it is 30-52% that thinned high-barrier liquid packaging film according to claim 1, the skin that it is characterized in that described polyethylene based film comprise the percentum that medium density polyethylene or high density polyethylene (HDPE) or the compound of the two account for this skin total weight; It is 30-60% that the middle level of polyethylene based film comprises the percentum that medium density polyethylene or high density polyethylene (HDPE) or the two compound account for this middle level total mass.
5, thinned high-barrier liquid packaging film according to claim 1 is characterized in that the skin of described polyethylene based film also comprises polybutene or polyisobutene 0-5%.
6, thinned high-barrier liquid packaging film according to claim 1 is characterized in that the skin of described polyethylene based film also comprises linear low density polyethylene, polyethylene white mother and polybutene; The middle level of polyethylene based film also comprises metallocene linear-low density polyethylene; The internal layer of polyethylene based film comprises high pressure polyethylene, linear low density polyethylene and metallocene linear-low density polyethylene; Described polyvinyl alcohol high-obstruction comprises polyvinyl alcohol, reinforcement tackifier, inhibiter and water; The skin of described polyethylene film protective cover, middle level, internal layer also comprise linear low density polyethylene and high pressure polyethylene.
7, thinned high-barrier liquid packaging film according to claim 6 is characterized in that described polyethylene based film middle level also comprises linear low density polyethylene, polyethylene white mother or polyethylene black masterbatch; The polyvinyl film inner layer also comprises the polyethylene black masterbatch; Described polyvinyl alcohol high-obstruction also comprises the light stabilizer that accounts for polyvinyl alcohol high-obstruction total mass percentum 0-3% and the fixer of 0-5%; Described inhibiter is silanes or titanate ester; The reinforcement tackifier are nano kaoline, nanometer lithium magnesium silicate, nano imvite or its compound.
8, a kind of method of making the described thinned high-barrier liquid packaging film of claim 1-7 is characterized in that it comprises following processing step:
The preparation of polyethylene based film:
The preparation of PVA paint;
The preparation of polyethylene film protective cover;
Coating, compound, it comprises the dilution PVA paint, the skin of the PVA paint that diluted being coated polyethylene based film forms the polyvinyl alcohol high-obstruction, and polyethylene film protective cover and polyvinyl alcohol high-obstruction is compound;
Slaking, cut.
9, the manufacture method of thinned high-barrier liquid packaging film according to claim 8, the preparation that it is characterized in that described PVA paint is to be that the reinforcement tackifier of polyvinyl alcohol, the 1-5% of 15-22%, the inhibiter of 0.5-2% and the water of 71-83.5% mix with percentage by weight, in the heating reactor, stir, be dissolved into clear solution in 90-95 ℃, be cooled to 50-60 ℃.
10, the manufacture method of thinned high-barrier liquid packaging film according to claim 9, it is characterized in that described dilution PVA paint is that usefulness is heated to 50-60 ℃ quick dry agent and the mixed solution of water dilutes, stir more than 2 hours, filter with 100～200 mesh filter screens; Wherein quick dry agent is normal propyl alcohol, ethanol, methyl alcohol or its compound.
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| CNB2008101124237A CN100532219C (en) | 2008-05-23 | 2008-05-23 | Thinned high-barrier liquid packaging film and manufacturing method thereof |
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| CN100532219C CN100532219C (en) | 2009-08-26 |
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