CN102152577B - Easy-removing cover film with high-temperature resistant polypropylene cup material function and preparation method thereof - Google Patents
Easy-removing cover film with high-temperature resistant polypropylene cup material function and preparation method thereof Download PDFInfo
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- CN102152577B CN102152577B CN 201010594075 CN201010594075A CN102152577B CN 102152577 B CN102152577 B CN 102152577B CN 201010594075 CN201010594075 CN 201010594075 CN 201010594075 A CN201010594075 A CN 201010594075A CN 102152577 B CN102152577 B CN 102152577B
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Abstract
The invention belongs to the field of food package, and relates to an easy-removing cover film with the high-temperature resistant polypropylene cup material function, which comprises a printing layer polyethylene terephthalate film printed with an oil ink printing pattern; the printing layer polyethylene terephthalate after printed with the oil ink printing pattern is sequentially stuck with a blocked layer nylon film or silicon-plated polyester film and a heat sealing layer casting polypropylene film to form the easy-removing cover film, wherein the casting polypropylene film is produced by adopting a three-layer coextrusion technique, and a peeling way belongs to cohesion peeling. The easy-removing cover film can bear the sterilization under the high temperature of 131 DEG C for 45min, does not have phenomena like delamination, peeling and damage after the sterilization, and has plump and flat package as well as excellent effects; has proper heat sealing strength and firm sealing opening, is smooth without a pause feeling when being removed; and has good blocking performances and anti-pollution performance as well as longer product guarantee period. The easy-removing cover film can be combined with the polypropylene cup material to replace traditional glass bottles and tinplate tank high-temperature sterilization package products, reduces the package cost, and has broad market prospect.
Description
Technical field
The invention belongs to the packaging for foodstuff field, be specifically related to a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma and preparation method thereof.
Background technology
At present, the packings such as various tinned fruits, canned meat, canned fish, congee class have begun to attempt to replace and pack that energy consumption is large, carrying cost is high with easily taking off mode that epiphragma is combined with the polypropylene cup, and large glass bottle and jar and can take up room.Process half an hour to one hour because the packings such as tinned fruit, canned meat, canned fish, congee class need to stand 110 ℃～121 ℃ high-temperature sterilizations in process of production, the conventional composite flexible package is easily taken off packing technique that epiphragma is combined with the polypropylene cup and is mainly used in the packaging fields of processing food such as normal temperature or low temperature jelly, sour milk, pudding.The combination of this kind epiphragma and polypropylene cup can not bear high-temperature heating treatment, easily occurs the problems such as sealing property is poor, the barrier resistance tocrocking is poor after high-temperature heating treatment.Therefore, research and development have high-temperature resistant polypropylene cup material function easily to take off epiphragma significant for the development that promotes the packaging for foodstuff such as can, congee class field.
From the technology that epiphragma and cup are peeled off, realize easily taking off the lift-off technology of function mainly take following three kinds of methods as main:
(1) delamination: when delamination referred to epiphragma is opened from cup, the hot sealing layer of epiphragma and other composite bed generation layerings and producing peeled off.The compound fastness of the hot sealing layer of epiphragma is less than sealing-strength, and hot sealing layer is thinner, is easy to break to form layering, and peeling force size (being heat seal strength) is wayward, when opening epiphragma, the phenomenons such as wire drawing, band burr is arranged easily.
(2) interface peel: interface peel is called totally again to be peeled off, and when epiphragma was opened from cup, the hot sealing layer of epiphragma can strip down from cup fully.After epiphragma was peeled off, epiphragma and cup did not have obvious color, the transparency to change, and the stripper surface of cup is clean, neat, attractive in appearance.This mode of peeling off is the mode of peeling off that at present a lot of jelly, sour milk, pudding etc. are easily taken off epiphragma, when but the size of its peeling force is subject to sealing, the impact of condition is larger, heat-sealing window relative narrower, after standing the high-temperature sterilization process, epiphragma namely can Automatic-falling, peel off.
(3) poly-peeling off in: interior poly-peeling off when referring to epiphragma is opened from cup, the hot sealing layer of epiphragma first produces interfacial failure and inside occurs and peels off, self is destroyed, a hot sealing layer part is stayed on the epiphragma main body, another part has been stayed cup surface, after epiphragma is peeled off, peels off that vestige is clear to be white in color, peel strength is usually lower, can realize that easily taking off of high-temperature resistant polypropylene cup material epiphragma peel off.But due to interior poly-stripping damage be the hot sealing layer of self, its hot sealing layer thin film technology technological requirement is higher, usually adopts the coated heat sealing adhesive process to be about to have the heat-seal adhesive of easily peeling off character and coats the epiphragma heat cover, makes it have easy fissility.At present only there is the large-scale trans-corporation's coated heat sealing adhesive process of external a few family to develop high-temperature resistant polypropylene cup and easily takes off epiphragma, as gondola B-Pack, Japan eastern beautiful etc., and domestic manufacturer unable production hot sealing layer film mainly depends on external import.
Summary of the invention
In view of this, first technical problem to be solved by this invention be to provide a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma.This high-temperature resistant polypropylene cup material is easily taken off epiphragma and has been overcome the deficiencies in the prior art, not only can tolerate the high temperature sterilization of 131 ℃, and after sterilization epiphragma without layering, disrepair phenomenon, and when opening feel smoothly without the pause and transition in rhythm or melody sense, without phenomenons such as wire drawing, band burrs.
Second technical problem to be solved by this invention is to provide the preparation method that this high-temperature resistant polypropylene cup material is easily taken off epiphragma.
Technical problem to be solved by this invention is achieved through the following technical solutions:
A kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, comprise the printed layers polyethylene terephthalate thin film after the curing ink printed patterns, the printed layers polyethylene terephthalate thin film after described curing ink printed patterns bonding barrier layer nylon film or plating silicon polyester film and hot sealing layer cast polypropylene film successively forms and easily takes off epiphragma.
Wherein the printed layers polyethylene terephthalate thin film is used for the pattern that curing ink printing client needs; Barrier layer nylon film or plating silicon polyester film have higher barrier property and antifouling property; The hot sealing layer cast polypropylene film also can be described as peel ply, is used for realizing easily taking off peeling off of epiphragma and cup.
Described hot sealing layer cast polypropylene film is comprised of hot sealing layer, supporting layer, corona layer.Wherein said hot sealing layer comprises high temperature resistant HOPP, polyethylene or ethylene-vinyl acetate copolymer, additive, described high temperature resistant HOPP is base material, and described polyethylene or ethylene-vinyl acetate copolymer are evenly dispersed in base material with the form of " isolated island "; Supporting layer uses high temperature resistant HOPP resin; The corona layer uses conventional HOPP resin.
The hot sealing layer cast polypropylene film that the present invention easily takes off epiphragma is peel ply.Owing to there being two kinds of different phases in the material of peeling off, phase and phase is directly incompatible, just there are contact and the containment relationship of physics aspect, contact-making surface in two-phase has just produced the interface like this, externally under the effect of pulling force, peel off at two alternate interfaces, thereby realize the effect of peeling off easily take off, its principle is the interior poly-principle of peeling off; Supporting layer uses high temperature resistant HOPP resin, and good heat-resisting quantity and deflection is provided, and is easy to the walk machine of co-extrusion film on client's packaging production line; The corona layer adopts conventional HOPP resin, is easy to beat sided corona treatment and improves the surface tension state, more than when walking machine, the corona value reaches 38 dyne.
In described hot sealing layer, the mass percentage content of each composition is: high temperature resistant HOPP 91～98.2%, incompatible phase polyethylene or ethylene-vinyl acetate copolymer 1～7%, surplus are additive.
Described additive is 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive.
Described slipping agent can be selected one or both the mixing in oleamide or erucyl amide, and described defoamer is the polyurethane defoamer, and described antistatic additive is non-ionic antistatic agent.
The hot sealing layer of described hot sealing layer cast polypropylene film, supporting layer, corona layer by layer between Thickness Ratio be 0.5～1.5:2.5～3.5:0.5～1.5.
Described printing ink is without benzene polyurethane or acrylic acid modified resin printing ink.
Described adhesive is adhesive for polyurethane, and consumption is 3.1 ~ 3.4g/m
2
The method of easily taking off epiphragma that preparation has high-temperature resistant polypropylene cup material function is as follows:
(1) the hot sealing layer cast polypropylene film adopts the three-layer co-extruded explained hereafter that goes out, and concrete preparation method is:
A) batch mixing is with dry: the high temperature resistant HOPP raw material particle of hot sealing layer raw material-91～98.2%, 1～7% polyethylene or ethylene-vinyl acetate copolymer, 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive are mixed, fully stir, it is mixed, then carry out drying and process; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out respectively the drying processing;
B) melting and film forming: the extruder of the raw material of each layer by separately is through heating and melting, the resin of melting enters distributor and distributes in proportion, more after filtering, the molten resin of elimination impurity is extruded from T-shaped die head co-extrusion, and be attached to rapidly chilling roller surface, form cast polypropylene film;
C) thickness measuring, corona and rolling: after the online thickness measure of cast polypropylene film process of the cooling formation of chilling roller, carry out sided corona treatment at the corona layer, then be wound into semi-finished product;
D) Ageing Treatment with cut: the semi-finished product of above rolling are carried out Ageing Treatment so that stable performance, and then cut into as requested the desired volume film of client, i.e. cast polypropylene film finished product.
(2) by the sided corona treatment face curing ink printing client needed pattern of gravure printing technique in the printed layers polyethylene terephthalate thin film;
(3) by the plating silicon face of dry type complex method with adhesive composite nylon film treated side on the printing surface of polyethylene terephthalate thin film or plating silicon polyester film, then in 70%RH(relative humidity) * condition of temperature 50 C * 48h under slaking.(4) again by the sided corona treatment face of dry type complex method with adhesive compound thermal seal cast polypropylene film on the non-plating silicon face of the non-treated side of the nylon film of step (3) resulting materials or plating silicon polyester film, and then in 70%RH(relative humidity) * condition of temperature 50 C * 96h under slaking.
(5) with the laminated film after above-mentioned slaking according to the customer requirement size cut, rolling, packing, make the high temperature resistant epiphragma finished product of easily taking off.
Compared with prior art, the present invention can reach following beneficial effect:
(1) to adopt the modified random copolymerization cast polypropylene film be hot sealing layer film (easily take off layer) in the present invention, easily take off in layer by two kinds of incompatible being distributed in mutually, according to the interior poly-principle of peeling off, realize the effect of peeling off easily take off, heat seal strength is 15～30N/15mm, peeling force fluctuation≤3N/15mm, heat seal strength is moderate, not only sealing firmly, and is easily opened, when opening smoothly without the pause and transition in rhythm or melody sense.
(2) the selected material of the present invention can tolerate the high temperature sterilization of 131 ℃ * 45 minutes, after sterilization without layering, peel off, the phenomenon such as damaged.
(3) barrier layer of the present invention is selected nylon or plating silicon polyester, make the present invention that higher barrier property and antifouling property be arranged, transmitance≤the 5cc/m2.23 of oxygen ℃ * 24h * 70%RH, the transmitance of steam≤2g/ m2.38 ℃ * 24h * 90%RH, shelf life of products is longer.
(4) the selected material of the present invention has good shrinkage, after high temperature sterilization, packs full, smooth, respond well.
(5) the present invention is combined with polypropylene cup material and can be replaced traditional vial, can high temperature sterilization packaging product, has reduced packing cost, and market prospects are wide.
Description of drawings
Fig. 1 is that embodiment one high-temperature resistant polypropylene cup material is easily taken off the epiphragma structural representation.
Fig. 2 is the structural representation that embodiment one high-temperature resistant polypropylene cup material is easily taken off the hot sealing layer film of epiphragma.
Fig. 3 is that embodiment one high-temperature resistant polypropylene cup material is easily taken off the poly-design sketch of peeling off in epiphragma.
The specific embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with embodiment and accompanying drawing, the present invention is done detailed description.Printing ink and adhesive used in embodiment are not limitation of the present invention, in fact, may be used to the present invention printed patterns and bonding each layer film on printed layers as long as meet high temperature resistant printing ink and the adhesive of easily taking off the epiphragma requirement.
Embodiment one
What the present embodiment had fire resistant polypropylene (PP) cup material function easily takes off epiphragma as shown in Figure 1, and its structure is followed successively by from outside to inside: 1-printed layers polyethylene terephthalate thin film (PET); 2-is without benzene polyurethane ink layer (INK); 3 and 5-adhesive for polyurethane (AD); 4-barrier layer nylon film (NY); 6-hot sealing layer cast polypropylene film (CPP).
Wherein the hot sealing layer film CPP of innermost layer as shown in Figure 2, this layer adopts the three-layer co-extruded explained hereafter that goes out, layer thickness is than 1:3:1,61 be the corona layer, adopts conventional homopolymerization PP resin, walks electromechanics and swoons more than value reaches 38 dyne; 62 for having the clear support layer of enough deflections, and material adopts high temperature resistant homopolymerization PP resin; 63 is the hot sealing layer with " isolated island " effect, and employing can be base material with the resistant to elevated temperatures random copolymerization PP resin particle of PP cup material heat-sealing, and its incompatible phase PE is evenly dispersed in base material with the form of " isolated island ".
Of the present invention peeling off is created in hot sealing layer film CPP6, and Fig. 3 is the interior poly-design sketch of peeling off that the present invention easily takes off epiphragma.7 is cup, and effect is peeled off in 8 inside of easily taking off epiphragma for the present invention.
The preparation method who easily takes off epiphragma that the present embodiment has high temperature resistant PP cup material function is as follows:
(1) innermost layer CPP adopts the three-layer co-extruded explained hereafter that goes out, and concrete preparation method is:
A) batch mixing is with dry: the high temperature resistant HOPP raw material particle of hot sealing layer raw material-91～98.2%, 1～7% polyethylene or ethylene-vinyl acetate copolymer, 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive are mixed, fully stir, it is mixed, then carry out drying and process; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out respectively the drying processing;
B) melting and film forming: the extruder of the raw material of each layer by separately is through heating and melting, the resin of melting enters distributor and distributes in proportion, more after filtering, the molten resin of elimination impurity is extruded from T-shaped die head co-extrusion, and be attached to rapidly chilling roller surface, form cast polypropylene film;
C) thickness measuring, corona and rolling: after the online thickness measure of cast polypropylene film process of the cooling formation of chilling roller, carry out sided corona treatment at the corona layer, then be wound into semi-finished product;
D) Ageing Treatment with cut: the semi-finished product of above rolling are carried out Ageing Treatment so that stable performance, and then cut into as requested the desired volume film of client, i.e. cast polypropylene film finished product.
(2) print client needed pattern at the sided corona treatment face of PET with INK by gravure printing technique;
(3) by the dry type complex method with the treated side of the compound NY of AD on the printing surface of PET, then in 70%RH(relative humidity) * condition of temperature 50 C * 48h under slaking.
(4) again by the dry type complex method with the sided corona treatment face of the compound CPP of adhesive on the non-treated side of the NY of PET/INK/AD/NY, and then in 70%RH(relative humidity) * condition of temperature 50 C * 96h under slaking.
(5) with the laminated film PET/INK/AD/NY/AD/CPP after above-mentioned slaking according to the customer requirement size cut, rolling, packing, make the high temperature resistant epiphragma finished product of easily taking off.
This is high temperature resistant, and PP cup material easily takes off epiphragma and PP cup material heat seal strength is 15～30N/15mm, and heat seal strength is moderate; Peeling force fluctuation≤3N/15mm when opening, and feel is smoothly without the pause and transition in rhythm or melody sense; Can tolerate the high temperature sterilization of 131 ℃ * 45 minutes, after sterilization without layering, peel off, the phenomenon such as damaged, and pack full, smooth, respond well; Transmitance≤the 5cc/m2 of test oxygen under the condition of 70%, 23 ℃ * 24h of relative humidity, the transmitance≤2g/m2 of test water steam under the condition of 90%, 38 ℃ * 24h of relative humidity has higher barrier property.
Embodiment 2
The structure of easily taking off epiphragma that the present embodiment has high temperature resistant PP cup material function is followed successively by from outside to inside: polyethylene terephthalate thin film (PET), acrylic acid modified resin ink lay (INK), adhesive phase (AD), plating silicon polyester film (SPET), adhesive phase (AD), cast polypropylene film (CPP).
Wherein the CPP employing can be base material with the resistant to elevated temperatures atactic copolymerized polypropene resin particle of polypropylene cup material heat-sealing, and its incompatible phase EVA is evenly dispersed in base material with the form of " isolated island ".
The preparation method who easily takes off epiphragma that the present embodiment has high-temperature resistant polypropylene cup material function is as follows:
(1) innermost layer CPP adopts the three-layer co-extruded explained hereafter that goes out, and concrete preparation method is:
A) batch mixing is with dry: the high temperature resistant HOPP raw material particle of hot sealing layer raw material-91～98.2%, 1～7% polyethylene or ethylene-vinyl acetate copolymer, 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive are mixed, fully stir, it is mixed, then carry out drying and process; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out respectively the drying processing;
B) melting and film forming: the extruder of the raw material of each layer by separately is through heating and melting, the resin of melting enters distributor and distributes in proportion, more after filtering, the molten resin of elimination impurity is extruded from T-shaped die head co-extrusion, and be attached to rapidly chilling roller surface, form cast polypropylene film;
C) thickness measuring, corona and rolling: after the online thickness measure of cast polypropylene film process of the cooling formation of chilling roller, carry out sided corona treatment at the corona layer, then be wound into semi-finished product;
D) Ageing Treatment with cut: the semi-finished product of above rolling are carried out Ageing Treatment so that stable performance, and then cut into as requested the desired volume film of client, i.e. cast polypropylene film finished product.
(2) by the sided corona treatment face printing client needed pattern of gravure printing technique at PET;
(3) by the dry type complex method with the plating silicon face of adhesive composite S PET on the printing surface of PET, then in 70%RH(relative humidity) * condition of temperature 50 C * 48h under slaking;
(4) again by the dry type complex method the non-plating silicon face of the SPET of the PET/INK/AD/SPET after with slaking with the sided corona treatment face of the compound CPP of adhesive, and then in 70%RH(relative humidity) * condition of temperature 50 C * 5day under slaking;
(5) with the laminated film PET/INK/AD/SPET/AD/CPP after above-mentioned slaking according to the customer requirement size cut, rolling, packing, make the high temperature resistant epiphragma finished product of easily taking off.
This is high temperature resistant, and PP cup material easily takes off epiphragma and PP cup material heat seal strength is 15～30N/15mm, and heat seal strength is moderate; Peeling force fluctuation≤3N/15mm when opening, and feel is smoothly without the pause and transition in rhythm or melody sense; Can tolerate the high temperature sterilization of 131 ℃ * 45 minutes, after sterilization without layering, peel off, the phenomenon such as damaged, and pack full, smooth, respond well; Transmitance≤the 5cc/m of test oxygen under the condition of 70%, 23 ℃ * 24h of relative humidity
2, the transmitance≤2g/m2 of test water steam under the condition of 90%, 38 ℃ * 24h of relative humidity has higher barrier property.
Above-described embodiment is only preferred embodiments of the present invention; should not be construed as limiting the invention; in the situation that do not break away from the technical solution of the present invention scope; any technology contents of above-mentioned announcement that utilizes is made the equivalent variations scheme that part is changed or modified, within all should falling into protection scope of the present invention.
Claims (8)
- One kind have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: comprise the printed layers polyethylene terephthalate thin film after the curing ink printed patterns, the printed layers polyethylene terephthalate thin film after described curing ink printed patterns bonding barrier layer nylon film or plating silicon polyester film and hot sealing layer cast polypropylene film successively forms and easily takes off epiphragma;Described hot sealing layer cast polypropylene film is produced with coextrusion process by hot sealing layer, supporting layer, corona layer, described hot sealing layer comprises high temperature resistant HOPP, polyethylene or ethylene-vinyl acetate copolymer, additive, described high temperature resistant HOPP is base material, and described polyethylene or ethylene-vinyl acetate copolymer are evenly dispersed in base material with the form of " isolated island "; Supporting layer uses high temperature resistant HOPP resin; The corona layer uses conventional HOPP resin.
- According to claim 1 a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: in described hot sealing layer, the mass percentage content of each composition is: high temperature resistant HOPP 91～98.2%, incompatible phase polyethylene or ethylene-vinyl acetate copolymer 1～7%, surplus are additive.
- According to claim 2 a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: described additive is 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive.
- According to claim 3 a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: described slipping agent can be selected one or both the mixing in oleamide or erucyl amide, described defoamer is the polyurethane defoamer, and described antistatic additive is non-ionic antistatic agent.
- According to claim 1 a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: the hot sealing layer of described hot sealing layer cast polypropylene film, supporting layer, corona layer by layer between Thickness Ratio be 0.5～1.5:2.5～3.5:0.5～1.5.
- According to claim 1～5 any one described a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: described printing ink is for without benzene polyurethane or acrylic acid modified resin printing ink.
- According to claim 6 any one described a kind of have a high-temperature resistant polypropylene cup material function easily take off epiphragma, it is characterized in that: described adhesive is the agent of polyurethane gluing, and consumption is 3.1 ~ 3.4g/m 2
- 8. preparation method who easily takes off epiphragma with high-temperature resistant polypropylene cup material function claimed in claim 1 is characterized in that preparation process is:(1) the thin cast polypropylene film of hot sealing layer adopts the three-layer co-extruded explained hereafter that goes out, and skin is hot sealing layer, and the centre is supporting layer, and internal layer is the corona layer, and its layer thickness ratio is 0.5～1.5:2.5～3.5:0.5～1.5;(2) by the treated side printing client needed pattern of gravure printing technique curing ink at the printed layers film;(3) by the dry type complex method with the compound barrier layer nylon film of adhesive on the material of step (2) preparation or plating silicon polyester film, then carry out maturation process under temperature, humidity and time are respectively 45～55 ℃, 60～80%, 45～55h condition;(4) again by the dry type complex method with the hot sealing layer cast polypropylene film of adhesive composite steps (1) gained on step (3) resulting materials, and then be respectively maturation process under the condition of 45～55 ℃, 60～80%, 3～6 days in temperature, humidity and time;(5) with step (4) gained high temperature resistant easily take off epiphragma according to the customer requirement size cut, rolling, packing, make the high temperature resistant epiphragma finished product of easily taking off.
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| CN102555391B (en) * | 2011-12-14 | 2015-08-19 | 安徽双津实业有限公司 | A kind of polypropylene film |
| CN106183263A (en) * | 2015-05-07 | 2016-12-07 | 天津亨和塑机科技有限公司 | Novel antistatic film |
| CN106183321B (en) * | 2016-07-25 | 2018-06-15 | 浙江洁美电子科技股份有限公司 | Paper carrying belt cover strip |
| CN108068423A (en) * | 2017-12-07 | 2018-05-25 | 江阴升辉包装材料有限公司 | A kind of high barrier base material film of digestion resistant includes its openable cover film and preparation method thereof |
| CN112706430A (en) * | 2019-10-25 | 2021-04-27 | 内蒙古蒙牛乳业（集团）股份有限公司 | Yogurt eight-connecting-cup, modified PP sheet for manufacturing yogurt eight-connecting-cup and preparation method of modified PP sheet |
| CN112373158A (en) * | 2020-10-22 | 2021-02-19 | 金石包装（嘉兴）有限公司 | Preparation method of plastic-uptake composite sheet for cheese packaging |
| CN112659707B (en) * | 2020-12-17 | 2022-10-28 | 浙江大汇新材料有限公司 | Easy-to-tear food packaging cover film and preparation method thereof |
| CN117295609A (en) * | 2022-04-25 | 2023-12-26 | 母亲食品(安吉)有限公司 | High-temperature-resistant high-barrier anti-curl composite film, preparation method and application thereof |
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