CN103802432A - Transparent, high-barrier, cooking-resistant and easy-to-tear cover film and preparation method thereof - Google Patents
Transparent, high-barrier, cooking-resistant and easy-to-tear cover film and preparation method thereof Download PDFInfo
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- CN103802432A CN103802432A CN201410032355.9A CN201410032355A CN103802432A CN 103802432 A CN103802432 A CN 103802432A CN 201410032355 A CN201410032355 A CN 201410032355A CN 103802432 A CN103802432 A CN 103802432A
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Abstract
The invention belongs to the technical field of packaging materials and in particular relates to a transparent, high-barrier, cooking-resistant and easy-to-tear cover film and a preparation method thereof. A cooking-resistant tape-casting polypropylene film comprises a corona layer, a middle layer and a heat seal layer in sequence, wherein the heat seal layer comprises the following components by weight percent: 96-97 percent of binary copolymerization polypropylene, 1.5-2.5 percent of an inorganic anti-adhesive agent and 1-2 percent of a slip agent, and is prepared by a three-layer coextrusion method. The transparent, high-barrier, cooking-resistant and easy-to-tear cover film comprises a PET (polythylene terephthalate) silicon oxide-plated thin film, a polyamide thin film layer and the cooking-resistant tape-casting polypropylene film. The transparent, high-barrier, cooking-resistant and easy-to-tear cover film is high in barrier performance and can well meet a requirement on the quality guarantee of packaging contents and bear boiling and heating sterilization treatment under 121 DEG C for 30 minutes; furthermore, the appearance is flat after the cover film is treated; the edge of a packaging film is not curled. The transparent, high-barrier, cooking-resistant and easy-to-tear cover film is high in heat seal intensity and heat adhesive effect and ensures that breakage and leakage are avoided after high-temperature sterilization is executed, and the effect of convenience in opening is achieved; the transparent, high-barrier, cooking-resistant and easy-to-tear cover film is high in microwave permeability, so that direct microwave heating can be implemented.
Description
Technical field
The invention belongs to field of packaging material, be specifically related to a kind of transparency high separation Easy tearing lid of resistance to boiling film and preparation method thereof.
Background technology
In recent years, along with expanding economy, people's material life is enriched constantly, and rhythm of life is also constantly accelerated, and lives closely bound up food service industry also towards convenient, safe and sanitary, future development efficiently with people.If major-minor instant food, Chinese and Western are in conjunction with supporting fast food, student's meal, quick-frozen food, quick-served semi-finished etc.Therefore, food industry often strides forward a step, all packaging for foodstuff is proposed to new requirement.
Now, the quickening of people's rhythm of life, the convenient purification that has determined food diet will be the irreversible trend of food development.Food production business tries hard to attract consumer with hygienic and convenient, novel packing free from vulgarity, elegant in appearance.To there is following development trend in " Chinese Flexible Package Market report " forecast China packaging market: 1, be convenient to open, topple over and take out, and easy to use.2, transparency is good, and consumer can see content intuitively.3, can be used for microwave-oven-heating.4, barrier property is high, can well keep the quality of packing content thing.5, wherein particularly the go out leisure and the travel food that eat, not needing other container, not needing the instant packed of extra opener is the emphasis of development.
As far back as eighties of last century beginning of the nineties, along with the fast development of western fast food and instant food, the packaged form that seals Soft Roll capping material take plastic containers on backing is widely used in developed countries such as America and Europes.This type of packing does not need extra container, conveniently opens, is easy to carry about with one, safety and sanitation, and very the busy crowd of proper operation uses, and has just been subject to people's extensive welcome after release.In recent years, the packaged form of the plastic containers that occur successively releasing for quick rhythm of life on China's packaging for foodstuff market (as PP cup etc.) seal cap, from the packing in the fields such as original jelly, jam, biscuit, is just being extended to more application.Because the type packing shelf are effective, safety and sanitation performance is high, easy-to-use, has obtained increasing concern.
For the packing of this series products, must meet the boiling requirement of 121 ℃, 30 minutes.And traditional jelly epiphragma normally adopts PE as heat-sealable material, after PP cup material involution, can only bear the process requirements of 80 ℃, 30 minutes, under the conditions of cooking of 121 ℃, will produce distortion, break and the phenomenon such as layering.If heat-sealable material is replaced with to CPP(polypropylene film), can bear the thermophilic digestion of 121 ℃.But due to CPP properties of materials, the bonding strength of itself and PP cup material is high, is therefore difficult to tear, gives to use and will cause great inconvenience.Meanwhile, bowl cover face out-of-flatness after packing, overall sense organ weak effect.
In addition, for the packing of this series products, also need to meet that barrier property is high, transparency good, can heating using microwave etc. characteristic.Tradition mostly is PVDC, EVOH, aluminium foil, the large class of aluminizer four for packing the material taking blocking effect.The PVDC being widely used as high obstructing performance packaging material, its discarded object can produce Cl in the time that burning is processed
2can cause environmental pollution; EVOH barrier property is affected by environment large, and in the time of humidity >60%, barrier property obviously declines; Aluminium foil is opaque, resource consumption is large, easily wrinkle, obstruct microwave see through; Aluminizer is difficult for reclaiming, opaque, microwave permeability is poor, and in the time of thermophilic digestion, aluminium lamination obscission easily occurs.
Summary of the invention
For problems of the prior art; one of object of the present invention is to provide a kind of cast polypropylene film of resistance to boiling; this cast polypropylene film of resistance to boiling is different from traditional polypropylene film; both there is good boiling resistance energy; simultaneously; can control more accurately and the heat sealing strength of PP cup, in effective closely sealed protection content, there is easy unlatching, the easy effect of tear-off, facilitate consumer's use.
For achieving the above object, the present invention has adopted following technical scheme: a kind of cast polypropylene film of resistance to boiling, comprise successively corona layer, intermediate layer and hot sealing layer, and the Thickness Ratio of described corona layer, intermediate layer and hot sealing layer is 1:3～4:1;
Described corona layer is binary copolymerization polypropylene; Described intermediate layer is binary copolymerization polypropylene; Described hot sealing layer comprises the binary copolymerization polypropylene of 96～97wt%, the inorganic antiplastering aid of 1.5～2.5wt% and the slipping agent of 1～2wt%.
Preferably, the thickness of described corona layer, intermediate layer and hot sealing layer is respectively 15 μ m, 50 μ m, 15 μ m.
Simultaneously, the present invention also provides a kind of preparation method of this cast polypropylene film of resistance to boiling, comprise three-layer co-extruded method, corona layer resin, intermediate layer resin and hot sealing layer resin are added respectively in three barrels of extruder, controlling corona layer resin melt temperature is 230～250 ℃, intermediate layer resin melt temperature is 240～260 ℃, and hot sealing layer resin melt temperature is 230～250 ℃, and die gap is 0.6～0.8mm; By curtain coating cooling and shaping after coextrusion mold; Carry out again sided corona treatment, obtain the cast polypropylene film of resistance to boiling.
Another object of the present invention is to provide a kind of transparency high separation Easy tearing lid of resistance to boiling film, for realizing this object, the present invention has adopted following technical scheme: comprise successively PET monox-plated film layer, polyamide film layer and layer of polypropylene foil; The Thickness Ratio of described PET monox-plated film layer, polyamide film layer and layer of polypropylene foil is 10～15:20～30:75～85;
Described layer of polypropylene foil comprises corona layer, intermediate layer and hot sealing layer successively, and the corona of layer of polypropylene foil is placed on polyamide film layer one side;
The thickness of described corona layer, intermediate layer and hot sealing layer is respectively 15 μ m, 50 μ m, 15 μ m;
Described corona layer is binary copolymerization polypropylene; Described intermediate layer is binary copolymerization polypropylene; Described hot sealing layer comprises the binary copolymerization polypropylene of 96～97wt%, the inorganic antiplastering aid of 1.5～2.5wt% and the slipping agent of 1～2wt%.
Preferably, the thickness of described PET monox-plated film layer, polyamide film layer and layer of polypropylene foil is respectively 12 μ m, 25 μ m, 80 μ m.
Accordingly, the present invention also provides the preparation method of this transparency high separation Easy tearing lid of resistance to boiling film, comprises composite algorithm, PET monox-plated film, polyamide film, polypropylene film and adhesive is undertaken compound by dry compound machine, is then dried, cuts.
Preferably, the control of compounding machine speed is 130m/min, and baking temperature control is 70 ℃.
Preferably, described adhesive is the product that the trade mark that Gao Meng company produces is GM8160.
Comparatively perfect, also comprise the step that compound front PET monox-plated film prints, be specially:
In print production workshop, the temperature that controls environment is at 20～30 ℃, PET monox-plated film is carried out to colored printing by 12 look chromatic printing machines, and by computer chromatography instrument control seal carving brush chromatography error, 55～60 ℃ of level version baking temperatures, 70～85 ℃ of the full version printing of large area baking temperatures, air intake wind speed is 70 cubes of meter per seconds, air draft wind speed is 30 cubes of meter per seconds, and print speed printing speed is 200～240m/min; Be controlled at≤the 0.2mm of field printing overprint error at main position, the be controlled at≤0.4mm of field printing overprint error at less important position.
The transparency high separation Easy tearing lid of resistance to boiling film of the present invention, beneficial effect compared with prior art shows:
1), barrier property is good, can be good at meeting the demand of guaranteeing the quality of packing content thing, keeps quality and the local flavor of content.Can tolerate the hot water bath sterilization processing of 121 ℃, 30 minutes, and keep flat appearance after processing, there is not the phenomenons such as curling in packaging film limit.Have good heat seal strength and hot sticky effect, after the processing of assurance high-temperature sterilization, bale broken is not revealed, and meanwhile, reaches adaptation effect good and that conveniently open.There is good microwave permeability, can directly put into microwave-oven-heating.
2), find by contrast, the main performance technical indicator of the like product that the companies such as the transparency high separation Easy tearing lid of resistance to boiling film prepared by the present invention and SK Ltd. of Korea S and Japanese Heng Tian Co., Ltd. produce has reached same kind of products at abroad index, and part technical indicator surmounts like product completely, reach world-leading level.
3), there is more excellent every physical and chemical index, result of use is better, completely can meet and be suitable for the packing instructions of all kinds of glasss of material epiphragmas.Cost is lower, easy to use, adaptation modernization automated packaging equipment fast, package speed is fast, efficiency is high, shelf are effective, sealing-strength is stable, and security performance is good, meets requirement and the trend of modernization opening sealing cup material series products development, safe and reliable, there is good economic benefit and social benefit.
4) can environment not produced and be polluted, " three wastes " discharge can meet the requirement of environmental protection in process of production.In process of production, there is no chemical reaction.Process equipment all adopts noise devices, and exhaust facility is perfect, and circulation of air is smooth and easy.Material used is all nontoxic, to operative employee without harm, environmentally safe.
5), after domestic multiple esbablished corporations use feedback, the indices of this product meets a glass packaging standard for material epiphragma completely, can be widely used in the packing of the numerous food such as all kinds of fruit and vegetables, meat products.This product is easy to use, and cost is lower, is applicable to the current cost-saving low consumed development trend of falling.After product puts goods on the market, favored by user, be subject at present many esbablished corporations certainly, and be designated as the supplier of the main force of such material.
The specific embodiment
The transparency high separation Easy tearing lid of resistance to boiling film, comprises PET monox-plated film layer, polyamide film layer and layer of polypropylene foil successively.Wherein:
One, PET monox-plated film layer
Be made up of PET monox-plated film (plating silica pet film, SPET, buying is from Mitsubishi), it is the loading end of printing as outermost layer.PET monox-plated film, has good barrier properties energy, and transparency is high, and the boiling resistance energy that microwave permeability is good and good can be compound with multiple flexible packages, and fitness of process is good, can be to environment.Can be widely used in the packing in multiple fields such as food, beverage, meat products, flavouring, dairy products, electronic component, precision instrument accessory, microwave products, medicine.And the good stability of the dimension of PET monox-plated film in High-Speed Automatic packaging process, printing decoration result are good, the combination property and the product specification that have promoted product.
The key technical indexes of PET monox-plated film is as shown in table 1.
Table 1
Two, polyamide film layer
Be made up of polyamide film (be nylon film, BOPA, buying is moulded from Xiamen length, compound level), it has good obdurability, tensile strength, percentage elongation and wearability.Can strengthen withstand voltage, the shock-resistant and resistance to performance such as fall of product after compound, can well protect content, ensure the environmental suitability of product.And it has good barriering effect, compound with outer field PET monox-plated film after, can further improve barrier property and the environmental adaptability of epiphragma.Meanwhile, this product can substitute the barrier materials such as existing PVDC, EVOH, aluminium foil, aluminizer, plating silicon oxide film on barrier property, and has successfully avoided the weak point of above various types of materials.
The key technical indexes of polyamide film is as shown in table 2.
Table 2
Three, layer of polypropylene foil
Be made up of the cast polypropylene film of resistance to boiling, it comprises corona layer, intermediate layer and hot sealing layer successively, and the Thickness Ratio of corona layer, intermediate layer and hot sealing layer is 1:3～4:1, and three's thickness is preferably respectively 15 μ m, 50 μ m, 15 μ m.Wherein:
Corona layer is binary copolymerization polypropylene, for carrying out compound with thin polyurethane rete.It is strong that it has stability, and the feature that transparency is good has good adhesion strong with adhesive, can improve interlaminar strength.
Intermediate layer is binary copolymerization polypropylene, as filling major ingredient, can improve the adhesion of corona layer and hot sealing layer, further guarantees the resistance to cooking effect of product epiphragma.
Hot sealing layer comprises the binary copolymerization polypropylene of 96～97wt%, the inorganic antiplastering aid of 1.5～2.5wt% and the slipping agent of 1～2wt%.This layer has good processability, and rigidity is moderate, and precipitate is few, and its goods are transparent and glossy, little to the permeability of water vapour and air.
The thickness of hot sealing layer, has determined the heat seal strength between itself and PP cup.And need to contact away film with packaging facilities at this layer, and therefore, to select after the binary copolymerization polypropylene of WD170CF, then add a small amount of slipping agent, the inorganic antiplastering aid of appropriate amount, contributes to film take-up then.
By repetition test and test, the adhesion of the thickness of hot sealing layer and PP cup proportional example within the specific limits, specifically (heat-sealing temperature detects under the condition of 170 ℃) as shown in table 3.
Table 3
| Hot sealing layer is extruded thickness, μ m | With the adhesion of PP cup, N/15mm |
| 8 | 5～6 |
| 10 | 7～8 |
| 12 | 8～9 |
| 15 | 10～11 |
This cast polypropylene film of resistance to boiling, standby by three-layer co-extruded legal system, its key technical indexes is as shown in table 4.
Table 4
Four, adhesive
Gluing compound between PET monox-plated film layer, polyamide film layer and layer of polypropylene foil.Because common adhesive is after boiling, be easy to occur lamination, will cause packing to lose efficacy, the quality problems such as appearance deformation.Consider characteristic and the foodsafety of thermophilic digestion, therefore, can not select aromatic adhesive.Contrast by repetition test, be preferably the high GM8160 of alliance adhesive, this adhesive is two food packaging adhesive of component, there is higher initial bonding strength and excellent combined strength bination, can be resistance to 135 ℃, 30 minutes cooking disinfection packings, have the good feature of chemical resistance and heat resistance.Before and after boiling, peel strength is high, has the features such as higher food sanitation safe and quality stability.
Five, the preparation of the transparency high separation Easy tearing lid of resistance to boiling film
1, the preparation of the cast polypropylene film of resistance to boiling
1., extrude
The resin for preparing top layer and sandwich layer by certain formula is put into after hopper, and the plastics that contact with screw rod are bitten by screw rod, along with the rotation of screw rod is advanced to heading forcibly by screw thread.Plastics move forward along screw rod.The thrust of raising screw rod by longitudinal groove to plastics, increases feed rate.Porous plate is used for supporting screen pack, makes material become rectilinear motion from rotatablely moving together with dress filter screen thereon simultaneously, stops the material of impurity and not plasticizing to pass through, and increases the back pressure of feed streams.CPP melt, by hanger-style die, by even to the centre of melt and two ends film thickness control, forms flat-shaped extruding.According to the different qualities of three layers of pellet, adopt different melt temperatures.RF401 melt temperature is controlled at 230～250 ℃, and F800E melt temperature is controlled at 240～260 ℃, and WD170CF melt temperature is controlled at 230～250 ℃, die gap 0.6～0.8mm.
2., cooling and shaping:
Molten resin is extruded curtain coating to sharp cooling roll surface from die head, by rapid cooling rear formation film.Casting roller relies on forced water circulation cooling, reduces the roller surface temperature difference in order to improve cooling effect, and casting roller is taked jacket type design, in roller, is hollow.
Curtain coating chill roll is controlled its temperature with automatic temperature-adjusting control system conventionally, in the time that water temperature exceedes design temperature in roller, controls the magnetic valve of water inlet and automatically opens, and covers cold water and discharges hot water, until temperature reaches design temperature.
Adjust air gap by air knife, make film be close to casting roller surface, thereby improve cooling effect, the film that output is more transparent.In whole width, air velocity is wanted evenly, otherwise the quality of film will be affected.The clearance control of air knife is at 1～2mm, and the angle of air knife also directly has influence on the quality of film, is preferably controlled at 16%.
Vacuum tank is mounted in a negative pressure device between die head and casting roller, and it utilizes vacuum principle that the air between film and casting roller surface is pumped, and improves the subsides roller effect of film, avoids producing bubble between film and roller.Meanwhile, vacuum tank can also pump the gaseous material volatilizing in molten resin, reduces it and pollutes film in the condensation on casting roller surface.
3., thickness measuring
In high-speed and continuous production process, the thickness measuring of film must use contactless tracking automatically to detect.In order to guarantee the thickness uniformity of film, adopt radio isotope as beta thickness gauge.The continuous radiation stream of launching by constant radiation source, through needing the film of detect thickness and being incident upon radiation receiver.Measuring the data of gained can process by automatic feedback to computer, after processing, automatically adjusts die gap by mould port expansion bolt, and film thickness is kept evenly.
4., sided corona treatment
Sided corona treatment is that the energy that radio-frequency generator is produced passes through electrode, between electrode and sided corona treatment roller, form high voltage electric field, electrode accelerates the electronics of overflowing, collision mutually, energy is defeated by air, and excite air molecule to produce transmitting photon, and make air ionization and decomposition, form ozone and nitrogen oxide; Simultaneously, high energy electron and Ions Bombardment plastic sheeting surface, make its chain molecule fracture, produce free radical and corona in air product is oxidized, cross-linking reaction, make film surface polarization group, film surface is activated, part ion injects film, make surface coarsening, thereby increase the surface tension of film, the printing performance of improved thin film and adhesive power.
The intensity of sided corona treatment is that the gap of swooning between treatment tube with voltage height and the electrode-electric of electrode is relevant, and voltage is high, little with the distance of sided corona treatment roller, and sided corona treatment effect is strong; And it is relevant whether to sandwich air between film-sided corona treatment roller, will cause the back side of film also processed as accompanied air between film and treatment tube; Relevant with sided corona treatment roller, electrode surface cleannes, sided corona treatment roller surface is very dirty, can weaken the effect of sided corona treatment.
5., beat
Deflection device is made up of beat frame and servomotor, and effect is to eliminate thickness deviation accumulation, makes the volume film flat appearance after rolling.Beat frame does the closed loop moving that track is parallelogram under the driving of motor, and its result moves left and right film, eliminates film thickness deviation accumulation transversely with this.
6., trimming is reclaimed
Because constriction will occur on the melt film both sides of flowing out from die head, cause casting films both sides to have the extremely inhomogeneous part of thickness, this part of width is generally in 30cm left and right (die width).For reducing production costs, online recycling after being cut before the rolling on curtain coating production line, can reduce production costs.
2, printing
In print production workshop, the temperature that controls environment is at 20～30 ℃, PET monox-plated film is reached to the colored printing of 12 looks by domestic state-of-the-art 12 look intaglio press, and by high precision computerized chromatography instrument control seal carving brush chromatography error, 55～60 ℃ of level version baking temperatures, 70～85 ℃ of the full version printing of large area baking temperatures, air intake wind speed is 70 cubes of meter per seconds, air draft wind speed is 30 cubes of meter per seconds, and print speed printing speed is 200～240m/min.It is bright and clean that print film can reach trace, and character pattern printing is clear, and reticulate pattern is clear evenly.Be controlled at≤the 0.2mm of field printing overprint error at main position, the be controlled at≤0.4mm of field printing overprint error at less important position.
3, dry type is compound
The PET monox-plated film, polyamide film and the cast polypropylene film of resistance to boiling that have printed pattern and character are carried out compound by matrix structure order by dry compound machine successively, adhesive operation concentration used is controlled at 3# and examines grace cup 17～20 seconds, suitable coating weight, baking temperature is 70 ℃, and compounding machine linear velocity is controlled at 130m/min.Require without phenomenons such as compound pit, cutter silk, bubble, wrinkling, wire drawing, scratch and glue lines.
4, cut
According to the required different in width of consumer packaging, length, specification, compound good packaging film is cut to rolling film, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting volume film should be in strict conformity with customer requirement, end face flatness≤2mm, and layout position is without skew, and the calm space of a whole page of joint coincide.
In the transparency high separation Easy tearing lid of the resistance to boiling film product making, the Thickness Ratio of PET monox-plated film layer, polyamide film layer and layer of polypropylene foil is 10～15:20～30:75～85, and preferred thickness is respectively 12 μ m, 25 μ m, 80 μ m.
In order further to understand design of the present invention, below in conjunction with embodiment, the transparency high separation Easy tearing lid of resistance to boiling film and preparation method thereof is described.Wherein, the binary copolymerization polypropylene of corona layer is the product that the trade mark of Samsung Atuofeina Corp production is RF401, the binary copolymerization polypropylene in intermediate layer is the product that the trade mark of oil of SPC company production is F800E, in hot sealing layer, binary copolymerization polypropylene is the product that the trade mark of company of Borealis production is WD170CF, inorganic antiplastering aid is the product that the trade mark of Rui Tulan company production is ABPP10S, and slipping agent is the product that the trade mark of system Qi company production is SE07PP.
Embodiment 1～5
1., the preparation of the cast polypropylene film of resistance to boiling
Corona layer resin, intermediate layer resin and hot sealing layer resin are added respectively in three barrels of extruder, in each embodiment, the formula of each layer of resin is as shown in table 5.Meanwhile, control melt temperature and the die gap of every layer of resin, by curtain coating cooling and shaping after coextrusion mold; Carry out sided corona treatment, wherein the technological parameter of each embodiment is as shown in table 6, obtains the cast polypropylene film of resistance to boiling again.In the cast polypropylene film of resistance to boiling prepared by each embodiment, the thickness of each layer is as shown in table 7.
Table 5
Table 6
Table 7
2., the printing of PET monox-plated film
In print production workshop, temperature controls environment, PET monox-plated film is carried out to colored printing by 12 look chromatic printing machines, and by computer chromatography instrument control seal carving brush chromatography error, the full version printing baking temperature of control hierarchy version baking temperature and large area and air intake wind speed and air draft wind speed, print speed printing speed, meanwhile, control the be controlled at≤0.2mm of field printing overprint error at main position, the be controlled at≤0.4mm of field printing overprint error at less important position.Wherein the technological parameter of each embodiment is as shown in table 8.
Table 8
3., the preparation of the transparency high separation Easy tearing lid of resistance to boiling film
The PET monox-plated film, polyamide film and the cast polypropylene film of resistance to boiling that have printed pattern and character are carried out compound by matrix structure order by dry compound machine successively, adhesive operation concentration used is controlled at 3# and examines grace cup 17～20 seconds, suitable coating weight, baking temperature is 70 ℃, and compounding machine linear velocity is controlled at 130m/min.Require without phenomenons such as compound pit, cutter silk, bubble, wrinkling, wire drawing, scratch and glue lines.
In the transparency high separation Easy tearing lid of resistance to boiling film prepared by each embodiment, the thickness of each layer is as shown in table 9.
Table 9
The Performance Detection of the transparency high separation Easy tearing lid of resistance to boiling film prepared by each embodiment, as shown in table 10.
Table 10
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (9)
1. the cast polypropylene film of resistance to boiling, is characterized in that: this film comprises corona layer, intermediate layer and hot sealing layer successively, the Thickness Ratio of described corona layer, intermediate layer and hot sealing layer is 1:3～4:1; Described corona layer is binary copolymerization polypropylene; Described intermediate layer is binary copolymerization polypropylene; Described hot sealing layer comprises the binary copolymerization polypropylene of 96～97wt%, the inorganic antiplastering aid of 1.5～2.5wt% and the slipping agent of 1～2wt%.
2. the cast polypropylene film of resistance to boiling according to claim 1, is characterized in that: the thickness of described corona layer, intermediate layer and hot sealing layer is respectively 15 μ m, 50 μ m, 15 μ m.
3. the preparation method of the cast polypropylene film of resistance to boiling as claimed in claim 1, comprise three-layer co-extruded method, it is characterized in that: corona layer resin, intermediate layer resin and hot sealing layer resin are added respectively in three barrels of extruder, controlling corona layer resin melt temperature is 230～250 ℃, intermediate layer resin melt temperature is 240～260 ℃, hot sealing layer resin melt temperature is 230～250 ℃, and die gap is 0.6～0.8mm; By curtain coating cooling and shaping after coextrusion mold; Carry out again sided corona treatment, obtain the cast polypropylene film of resistance to boiling.
4. the transparency high separation Easy tearing lid of a resistance to boiling film, is characterized in that: originally tear epiphragma and comprise successively PET monox-plated film layer, polyamide film layer and layer of polypropylene foil;
The Thickness Ratio of described PET monox-plated film layer, polyamide film layer and layer of polypropylene foil is 10～15:20～30:75～85;
Described layer of polypropylene foil comprises corona layer, intermediate layer and hot sealing layer successively, and the corona of layer of polypropylene foil is placed on polyamide film layer one side;
The thickness of described corona layer, intermediate layer and hot sealing layer is respectively 15 μ m, 50 μ m, 15 μ m;
Described corona layer is binary copolymerization polypropylene, and described intermediate layer is binary copolymerization polypropylene, and described hot sealing layer comprises the binary copolymerization polypropylene of 96～97wt%, the inorganic antiplastering aid of 1.5～2.5wt% and the slipping agent of 1～2wt%.
5. the transparency high separation Easy tearing lid of resistance to boiling film according to claim 4, is characterized in that: the thickness of described PET monox-plated film layer, polyamide film layer and layer of polypropylene foil is respectively 12 μ m, 25 μ m, 80 μ m.
6. the preparation method of the transparency high separation Easy tearing lid of a resistance to boiling film as described in claim 4 or 5, comprise composite algorithm, it is characterized in that: PET monox-plated film, polyamide film, polypropylene film and adhesive are undertaken compound by dry compound machine, be then dried, cut.
7. the preparation method of the transparency high separation Easy tearing lid of resistance to boiling film according to claim 6, is characterized in that: the control of compounding machine speed is 130m/min, and baking temperature control is 70 ℃.
8. the preparation method of the transparency high separation Easy tearing lid of resistance to boiling film according to claim 6, is characterized in that: described adhesive is the product that the trade mark of Gao Meng company production is GM8160.
9. according to the preparation method of the transparency high separation Easy tearing lid of the resistance to boiling film described in claim 6 or 7 or 8, it is characterized in that: also comprise the step of compound front PET monox-plated film printing, be specially:
In print production workshop, the temperature that controls environment is at 20～30 ℃, PET monox-plated film is carried out to colored printing by 12 look chromatic printing machines, and by computer chromatography instrument control seal carving brush chromatography error, 55～60 ℃ of level version baking temperatures, 70～85 ℃ of the full version printing of large area baking temperatures, air intake wind speed is 70 cubes of meter per seconds, air draft wind speed is 30 cubes of meter per seconds, and print speed printing speed is 200～240m/min; Be controlled at≤the 0.2mm of field printing overprint error at main position, the be controlled at≤0.4mm of field printing overprint error at less important position.
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| CN104015328A (en) * | 2014-05-27 | 2014-09-03 | 浙江金瑞薄膜材料有限公司 | Polyolefin high barrier film processing technology |
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| CN104228215B (en) * | 2014-09-11 | 2016-07-06 | 黄山永新股份有限公司 | Corrosion-resistant packaging composite film of the resistance to steaming and decocting of high-barrier and preparation method thereof |
| CN105882085A (en) * | 2014-12-24 | 2016-08-24 | 张建华 | Composite packaging film for microwave heating |
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