CN102152565A - Current polypropylene film with cohesive peeling function and preparation method thereof - Google Patents
Current polypropylene film with cohesive peeling function and preparation method thereof Download PDFInfo
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- CN102152565A CN102152565A CN201010594080XA CN201010594080A CN102152565A CN 102152565 A CN102152565 A CN 102152565A CN 201010594080X A CN201010594080X A CN 201010594080XA CN 201010594080 A CN201010594080 A CN 201010594080A CN 102152565 A CN102152565 A CN 102152565A
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Abstract
The invention belongs to the technical field of food packaging materials and discloses a current polypropylene film with a cohesive peeling function. The current polypropylene film is prepared by a three-layer coextrusion process and consists of a heat sealing layer, a support layer and a corona layer, wherein the heat sealing layer is a high-temperature resistant polypropylene random copolymer layer; high-temperature resistant homopolymer polypropylene is taken as a base material; incompatible polyethylene or ethylene-vinlacetate copolymer is dispersed in the base material in an island mode; an additive is added into the base material at the same time; the support layer is made of high-temperature homopolymer polypropylene resin; and the corona layer is made of conventional homopolymer polypropylene resin. The current polypropylene film with the cohesive peeling function can be used as the heat sealing layer of a composite film used for a high-temperature resistant polypropylene cup material easily-uncovered cover film; and the cover film can be sterilized at the high temperature of 131 DEG C, cannot be layered and damaged after being sterilized, has moderate heat sealing strength and firm seal, and can be uncovered smoothly without rough feeling.
Description
Technical field
The invention belongs to the packaging material for food technical field, be specifically related to a kind of fire resistant polypropylene cup material that can be used for and easily take off poly-cast polypropylene film of function and preparation method thereof of peeling off in the having of epiphragma packing.
Background technology
At present, easily take off epiphragma and be mainly used in processed food packaging fields such as jelly, sour milk, pudding, the epiphragma of these food mainly is normal temperature or cryogenic product.Development along with society, the raising of people's living standard, instant food popular, easily take off epiphragma and begin progressively to be applied to high temperature sterilization product such as products such as can, congee class, and its glass bottle and jar and can begin to replace with polypropylene cup material, and above-mentioned epiphragma can not stand 121 ℃ high temperature sterilization, after standing the high-temperature sterilization process, epiphragma can come off automatically, peel off, and it is peeled off mode and belongs to interface peel, the size of peeling force (heat seal strength) when being sealed condition effect bigger, heat-sealing window relative narrower.Consider that epiphragma needs high temperature sterilization, it peels off mode should adopt the interior poly-mode of peeling off, because interior poly-stripping damage is the hot sealing layer of self, the preparation technology of its hot sealing layer film has relatively high expectations, usually adopting the coated heat sealing adhesive process to be about to have the heat-seal adhesive of easily peeling off character is coated with and the epiphragma heat cover, make it have easy fissility, current only have external a few family large-scale trans-corporation to develop the hot sealing layer that fire resistant polypropylene cup material is easily taken off epiphragma with the coated heat sealing adhesive process, and domestic manufacturer unable production hot sealing layer film mainly depends on external import.
Summary of the invention
First technical problem to be solved by this invention is to overcome the deficiencies in the prior art, a kind of interior poly-cast polypropylene film of peeling off function that has is provided, this cast polypropylene film not only can tolerate 131 ℃ high temperature sterilization, and epiphragma does not have layering, disrepair phenomenon after the sterilization, and peeling force is moderate, feel does not smoothly have the pause and transition in rhythm or melody sense when opening, phenomenons such as no wire drawing, band burr.
Second technical problem to be solved by this invention provided this and had the interior poly-preparation method who peels off the cast polypropylene film of function.
Technical problem to be solved by this invention is achieved through the following technical solutions:
A kind of have in the poly-cast polypropylene film of peeling off function, produce 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 a base material, and described polyethylene or ethylene-vinyl acetate copolymer are evenly dispersed in the base material with the form of " isolated island "; Supporting layer uses high temperature resistant HOPP resin; The corona layer uses conventional HOPP resin.
Described base material (high temperature resistant HOPP) can the high temperature sterilization of tolerable temperature up to 131 ℃, its incompatible phase polyethylene or ethylene-vinyl acetate copolymer are that the form with " isolated island " is evenly dispersed in the base material, owing to there are two kinds of different phases in the material of peeling off, phase and phase is directly incompatible, the contact and the containment relationship that just have the physics aspect, contact-making surface in two-phase has just produced the interface like this, externally peel off at two alternate interfaces under the effect of pulling force, thereby realize the effect of peeling off easily take off, its principle is the interior poly-principle of peeling off.The poly-cast polypropylene film of peeling off function provided good temperature resistance and deflection in supporting layer had for the present invention is a kind of, was easy to the walk machine of co-extrusion film on client's packaging production line.The poly-cast polypropylene film of peeling off function was easy to beat sided corona treatment and improves the surface tension state in the corona layer made that the present invention is a kind of and has, and the corona value reaches more than 38 dyne when walking machine.
The mass percentage content of each composition is in the described hot sealing layer: 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, and its effect is that to prevent that cast polypropylene film from returning sticking; 0.2 ~ 0.5% defoamer, its effect are to eliminate the minute bubbles that produce in the preparation of product process; 0.1 ~ 0.5% antistatic additive, its effect are to eliminate the static that produces in the preparation of product process.
Described slipping agent can be selected one or both the mixing in oleamide or the erucyl amide, and described defoamer is the polyurethane defoamer, and described antistatic additive is a non-ionic antistatic agent.
The layer thickness ratio of described hot sealing layer, supporting layer, corona layer is 0.5 ~ 1.5:2.5 ~ 3.5:0.5 ~ 1.5.
A kind of have in the poly-preparation method who peels off the cast polypropylene film of function, preparation process is:
(1) 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, carry out drying then and handle; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out drying respectively handle.
(2) fusion and film forming: the extruder of the raw material of each layer by separately is through heating and melting, the resin of fusion enters distributor and distributes in proportion, and more after filtering, the molten resin of elimination impurity is extruded from T pattern coextrusion head, and be attached to chilling roller surface rapidly, form cast polypropylene film;
(3) thickness measuring, corona and rolling: after the online thickness measure of cast polypropylene film process that the cooling of chilling roller forms, carry out sided corona treatment, be wound into semi-finished product then at the corona layer;
(4) Ageing Treatment with cut: the semi-finished product of above rolling are carried out Ageing Treatment so that stable performance, and then cut into the desired volume film of client, i.e. cast polypropylene film finished product as requested.
Wherein the melt temperature of the described hot sealing layer of step (2) is set at 240 ℃～260 ℃, and the melt temperature of supporting layer is set at 260 ℃～280 ℃, and the melt temperature of corona layer is set at 250 ℃～270 ℃.
The raw material particle of each layer distributes according to the weight ratio of 0.5 ~ 1.5:2.5 ~ 3.5:0.5 ~ 1.5 after entering distributor in the step (2).
The temperature of the described Ageing Treatment of step (4) is 25 ℃～45 ℃, and relative humidity is 60%～80%.
According to technique scheme, the beneficial effect of the present invention is a kind of in the having poly-cast polypropylene film of peeling off function is as follows:
(1) the present invention is a kind of have in the poly-cast polypropylene film of peeling off function, its hot sealing layer is a base material with high temperature resistant HOPP, add polyethylene or ethylene-vinyl acetate copolymer simultaneously, polyethylene or ethylene-vinyl acetate copolymer are that the form with " isolated island " is evenly dispersed in the base material, base material is mutually incompatible with polyethylene or ethylene-vinyl acetate copolymer, the contact and the containment relationship that just have the physics aspect, base material just can be peeled away mutually with incompatible like this.
(2) the poly-corona surface surface corona value 〉=38dyn/cm that peels off the cast polypropylene CPP film of function in the present invention has makes corona surface be easy to beat compound other film of corona; Skin-friction coefficient is walked machine 0.1 ~ 0.3 when being easy to produce.
(3) the present invention is a kind of have in the poly-material of peeling off the cast polypropylene film of function can tolerate 131 ℃ * 45 minutes high temperature, can be used as high temperature resistant hot sealing layer film and the heat-sealing of polypropylene cup material of easily taking off epiphragma, make that high temperature resistant easily to take off the epiphragma heat seal strength moderate, be easy to peel off, seal firmly.
(4) of the present invention have in the poly-cast polypropylene film of peeling off function, it combines with polypropylene cup material as the hot sealing layer film and is applied to high temperature resistant epiphragma product such as can class, congee class, greatly reduces packing cost, has the very high market competitiveness.
Description of drawings
Fig. 1 is a poly-structural representation of peeling off the cast polypropylene film of function in embodiment 1 has.
The specific embodiment
Below in conjunction with accompanying drawing and preferred embodiments, to the present invention propose a kind of have in poly-cast polypropylene film and the preparation method who peels off function be described in detail as follows:
Embodiment 1
A kind of have in the poly-cast polypropylene film of peeling off function, as shown in Figure 1, go out cast polypropylene film (CPP) for three-layer co-extruded, 63 be hot sealing layer, 62 be supporting layer, 61 is the corona layer, it is 1:3:1 that its layer thickness compares, gross thickness is 70 μ m.Hot sealing layer is high temperature resistant atactic copolymerized polypropene, it is a base material with 98% high temperature resistant HOPP, contain 1% incompatible phase polyethylene (PE) simultaneously, also contain 0.7% oleamide slipping agent, 0.2% polyurethane defoamer, 0.1% non-ionic antistatic agent.
Supporting layer is high temperature resistant HOPP.The corona layer is conventional HOPP resin.
The above-mentioned interior poly-preparation method who peels off the cast polypropylene film of function that has is:
(1) batch mixing is with dry: four kinds of raw materials of above-mentioned hot sealing layer are mixed, fully stir, it is mixed, carry out drying then and handle; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out drying respectively handle.
(2) fusion and film forming: the extruder of the raw material of each layer by separately is through heating and melting, wherein the melt temperature of hot sealing layer is at 240 ℃～260 ℃, the melt temperature of supporting layer is at 260 ℃～280 ℃, the melt temperature of corona layer is at 250 ℃～270 ℃, the resin of fusion enters distributor and distributes in the ratio of 1:3:1, and more after filtering, elimination impurity molten resin is extruded jointly from T pattern head, and be attached to chilling roller surface rapidly, form cast polypropylene film;
(3) thickness measuring, corona and rolling: form cast polypropylene film through after the online thickness measure through the cooling of chilling roller, carry out sided corona treatment, be wound into semi-finished product then at the corona layer;
(4) Ageing Treatment with cut: it is 25 ℃ that the semi-finished product of above rolling are placed on temperature, relative humidity carries out Ageing Treatment in 80% environment so that the product properties of product are stable, and then cut into the desired volume film of client, i.e. cast polypropylene film finished product as requested.
After testing, above-mentioned have the interior poly-cast polypropylene film skin-friction coefficient of peeling off function about 0.3, corona surface surface corona value 〉=38dyn/cm.
Embodiment 2
A kind of have in the poly-cast polypropylene film of peeling off function, go out cast polypropylene film for three-layer co-extruded, skin be hot sealing layer, the centre is a supporting layer, internal layer is the corona layer, it is 1:3:1 that its layer thickness compares, gross thickness is 70 μ m.Hot sealing layer is high temperature resistant atactic copolymerized polypropene, it is a base material with 95.4% high temperature resistant HOPP, contain 3% incompatible phase ethylene-vinyl acetate copolymer (EVA) simultaneously, also contain 0.8% erucyl amide slipping agent, 0.4% polyurethane defoamer, 0.4% non-ionic antistatic agent.Supporting layer is high temperature resistant HOPP resin.The corona layer is common HOPP resin.
The preparation method who gathers the cast polypropylene film of peeling off function in present embodiment has is identical with embodiment 1.
After testing, present embodiment has the interior skin-friction coefficient that gathers the cast polypropylene CPP film of peeling off function about 0.2, corona surface surface corona value 〉=38dyn/cm.
Above-mentioned only is preferred embodiments of the present invention; be not that the present invention is done any pro forma restriction; do not breaking away within the technical solution of the present invention scope; any technology contents that utilizes above-mentioned announcement is made the scheme of the equivalent variations of a little change or modification; all belong in the technical scheme scope of the present invention, so protection scope of the present invention should be as the criterion with appended claim.
Claims (9)
1. one kind has the interior poly-cast polypropylene film of peeling off function, it is characterized in that: the poly-cast polypropylene film of peeling off function was produced with coextrusion process by hot sealing layer, supporting layer, corona layer in this had, described hot sealing layer comprises high temperature resistant HOPP, polyethylene or ethylene-vinyl acetate copolymer, additive, described high temperature resistant HOPP is a base material, and described polyethylene or ethylene-vinyl acetate copolymer are evenly dispersed in the base material with the form of " isolated island "; Supporting layer uses high temperature resistant HOPP resin; The corona layer uses conventional HOPP resin.
2. a kind of interior poly-cast polypropylene film of peeling off function that has according to claim 1, it is characterized in that the mass percentage content of each composition in the described hot sealing layer is: high temperature resistant HOPP 91～98.2%, incompatible phase polyethylene or ethylene-vinyl acetate copolymer 1～7%, surplus are additive.
3. a kind of interior poly-cast polypropylene film of peeling off function that has according to claim 1 and 2 is characterized in that described additive is 0.5～1% slipping agent, 0.2～0.5% defoamer, 0.1～0.5% antistatic additive.
4. a kind of interior poly-cast polypropylene film of peeling off function that has according to claim 3, it is characterized in that: described slipping agent can be selected one or both the mixing in oleamide or the erucyl amide, described defoamer is the polyurethane defoamer, and described antistatic additive is a non-ionic antistatic agent.
5. a kind of interior poly-cast polypropylene film of peeling off function that has according to claim 1, it is characterized in that: the layer thickness ratio of described hot sealing layer, supporting layer, corona layer is 0.5～1.5:2.5～3.5:0.5～1.5.
6. a claim 1 is described have in the poly-preparation method who peels off the cast polypropylene film of function, it is characterized in that preparation process is:
(1) 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, carry out drying then and handle; And support layer material-high temperature resistant HOPP resin and corona layer material-conventional HOPP resin are carried out drying respectively handle;
(2) fusion and film forming: the extruder of the raw material of each layer by separately is through heating and melting, the resin of fusion enters distributor and distributes in proportion, and more after filtering, the molten resin of elimination impurity is extruded from T pattern coextrusion head, and be attached to chilling roller surface rapidly, form cast polypropylene film;
(3) thickness measuring, corona and rolling: after the online thickness measure of cast polypropylene film process that the cooling of chilling roller forms, carry out sided corona treatment, be wound into semi-finished product then at the corona layer;
(4) Ageing Treatment with cut: the semi-finished product of above rolling are carried out Ageing Treatment so that stable performance, and then cut into the desired volume film of client, i.e. cast polypropylene film finished product as requested.
7. a kind of interior poly-preparation method who peels off the cast polypropylene film of function that has according to claim 6, it is characterized in that: the melt temperature of the described hot sealing layer of step (2) is set at 240 ℃～260 ℃, the melt temperature of supporting layer is set at 260 ℃～280 ℃, and the melt temperature of corona layer is set at 250 ℃～270 ℃.
8. a kind of interior poly-preparation method who peels off the cast polypropylene film of function that has according to claim 7, it is characterized in that: the raw material particle of each layer distributes according to the weight ratio of 0.5 ~ 1.5:2.5 ~ 3.5:0.5 ~ 1.5 after entering distributor in the step (2).
9. a kind of interior poly-preparation method who peels off the cast polypropylene film of function that has according to claim 8, it is characterized in that: the temperature of the described Ageing Treatment of step (4) is 25 ℃～45 ℃, and relative humidity is 60%～80%.
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| CN115352159A (en) * | 2022-07-28 | 2022-11-18 | 广州普洛夫尔薄膜有限公司 | Co-extruded polypropylene sheet with easy-to-tear function and preparation process thereof |
| CN115352159B (en) * | 2022-07-28 | 2023-12-12 | 广州普洛夫尔薄膜有限公司 | Co-extrusion polypropylene sheet with easy-to-uncover function and preparation process thereof |
| CN115139615A (en) * | 2022-08-25 | 2022-10-04 | 河北泰达包装材料有限公司 | Flexible package modified CPP film and production method thereof |
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| CN102152565B (en) | 2013-07-03 |
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Effective date of registration: 20230714 Address after: No. 1, Yingshan North Road, Lilin Town, Zhongkai High tech Zone, Huizhou, Guangdong 516001 Patentee after: AMCO (Huizhou) new material technology Co.,Ltd. Address before: 516006 Ma Transition Huabao Industrial Park, Zhongkai Avenue, Huizhou City, Guangdong Province Patentee before: Huizhou Alcan Packaging Propack Co.,Ltd. |