CN103192570B - High-resistance steam resistant packaging film convenient for direct microwave heating and preparation method thereof - Google Patents
High-resistance steam resistant packaging film convenient for direct microwave heating and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of packaging materials, and in particular relates to a high-resistance steam resistant packaging film convenient for direct microwave heating and a preparation method thereof. The packaging film comprises an aluminum oxide plated PET (polyethylene terephthalate) film layer, a first steam resistant adhesive layer, a polyamide film layer, a second steam resistant adhesive layer and a steam resistant curtain coating polypropylene film layer which are adhered together in sequence. The preparation method of the packaging film comprises the following steps of: preparing an aluminum oxide plated PET film by steam-plating aluminum oxide on a PET film; then compounding the aluminum oxide plated PET film and the polyamide film layer together to obtain an outer layer film; and compounding the steam resistant curtain coating polypropylene film layer and the outer film layer together through a solvent-less compounding technology, thus obtaining the packaging film. The packaging film can heated with microwave directly, can resist 135DEG C high-temperature digestion to ensure that sterilization is carried out more comprehensive and thorough, and is high in resistance, good in heat sealability and air tightness, good in impact resistance, and excellent in physical mechanical property.
Description
Technical field
The invention belongs to field of packaging material, be specifically related to a kind of high-barrier retort packaging film being convenient to direct heating using microwave and preparation method thereof.
Background technology
Plastic package material as " rising sun-industry " is an indispensable part in the national economic development, along with expanding economy, and the growth of social required quantity and the expansion of exporting, more and more higher to the requirement of plastic package material.Plastic package material will to being conducive to saving energy and reduce the cost, the future development of anti-pollution, multi-functional and hommization.
Retort packaging developed over the past two years to pack one of classification faster.Digestion resistant food pack (hereinafter referred to as resistance to retort pouch), is commonly called as foods packed in carton containers, its most outstanding feature be long-term placement and do not occur putrid and deteriorated at normal temperatures; Use also very convenient, can heat boil again by cold food.Current resistance to retort pouch is mainly used in packing jar head food, prepared food etc., in Japan, West Europe also for packaged beverage, fruit juice, mashed potatoes, cereal foods etc.
Resistance to retort pouch common on usual market is all employing 121 DEG C of high-temperature sterilization process, and can well preserve and protect content, the general shelf-life be all within 6 months.China is along with the raising of people's living standard, more and more higher to the security requirement of packaging for foodstuff.How effectively to extend the shelf-life of pack content, keep the local flavor of content and mouthfeel to become a needs problem demanding prompt solution to greatest extent.And external flexible package manufacturer, in order to extend the shelf-life of pack content, combines mainly through two aspects and realizes at present: 1, by improving boiling temperature, carry out carrying out more comprehensively sterilization treatment thoroughly to content in the steam of 135 DEG C.2, the barrier property of packaging film is improved.Improve barrier and not only can prevent content loss of aroma, ensure the integrality of product fragrance and delicate flavour, meanwhile, excellent oxygen and vapor water barriers performance effectively can avoid the quality problems such as product generation oxidation deterioration.
And with the quickening pace of modern life, the micro-wave oven of Fast Heating can also enter huge numbers of families, can directly obtain and develop fast by the high-barrier thermophilic digestion packaging market of heating using microwave.The more convenient inevitable requirement of manner of packing more efficiently packaging material possess more function.Can enter micro-wave oven directly to heat, be the function that this type of high-barrier thermophilic digestion material should possess, and is also the development trend of a certainty.Be conventionally used to and pack the material that takes blocking effect and mostly be PVDC, EVOH, aluminium foil, the large class of aluminizer four.As the PVDC that high obstructing performance packaging material are widely used, its discarded object will produce Cl when burning process
2and environmental pollution can be caused; EVOH barrier property is greatly affected by environment, and as humidity > 60%, barrier property obviously declines; Aluminium foil is opaque, large, the easy wrinkle of resource consumption, obstruct microwave transparent; Aluminizer not easily reclaims, opaque, microwave transparent is poor, and when thermophilic digestion, aluminium lamination obscission easily occurs.
Therefore conventional obstructive material is difficult to the consumption occupation mode adapting to direct heating using microwave, food processing industry be badly in need of a kind of not only have excellent barrier property, can resistance to 135 DEG C of boilings, and directly can enter the packaging material of microwave-oven-heating.
Summary of the invention
An object of the present invention is to provide a kind of high-barrier retort packaging film being convenient to direct heating using microwave, this packaging film not only have excellent barrier property, can resistance to 135 DEG C of boilings, and directly can enter microwave-oven-heating.
For achieving the above object, present invention employs following technical scheme: a kind of high-barrier retort packaging film being convenient to direct heating using microwave, this packaging film comprises the plating aluminium oxide PET film layer, the first adhesive layer of resistance to boiling, polyamide film, the second adhesive layer of resistance to boiling and the cast polypropylene film of the resistance to boiling layer that fit successively; The described cast polypropylene film of resistance to boiling layer is made up of the corona layer be connected successively, intermediate layer and hot sealing layer, and described corona layer is adjacent with described second adhesive layer of resistance to boiling.
The present invention can also be able to further realization by following technical measures:
Preferably, described first adhesive layer of resistance to boiling and the second adhesive layer of resistance to boiling all adopt the double component solvent-free adhesive of resistance to boiling to make.
Preferably, the thickness of described plating aluminium oxide PET film layer is 12 μm, and the thickness of the first adhesive layer of resistance to boiling is 1 ~ 3 μm, and the thickness of polyamide film is 15 μm, and the thickness of the second adhesive layer of resistance to boiling is 1 ~ 3 μm.
Preferably, described corona layer is block copolymerization polypropylene layer, and intermediate layer is block copolymerization polypropylene and SEBS elastomer composite layer, and hot sealing layer is block copolymerization polypropylene layer.
Further, described SEBS elastomer is Polystyrene-Polyethylene/polybutene-polystyrene.
As the further preferred version of another kind of the present invention, described corona layer, part by weight between intermediate layer and hot sealing layer three are 1:3:1; The percentage by weight of the block copolymerization polypropylene in described intermediate layer is 80 ~ 85%, and the percentage by weight of Polystyrene-Polyethylene/polybutene-polystyrene is 15 ~ 20%.
Preferably, the thickness of described corona layer is 15 ~ 20 μm, and the thickness in intermediate layer is 60 ~ 70 μm, and the thickness of hot sealing layer is 15 ~ 20 μm.
Two of object of the present invention is to provide a kind of above-mentioned preparation method being convenient to the high-barrier retort packaging film of direct heating using microwave, and it comprises the steps:
1), aluminium oxide PET film is plated by obtained through plating alumina technology for PET film;
And by the batching of the cast polypropylene film of resistance to boiling successively through extruding operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming operation prepare the cast polypropylene film of resistance to boiling, the described cast polypropylene film of resistance to boiling is made up of the corona layer be connected successively, intermediate layer and hot sealing layer;
2), then first outer membrane is obtained by the first adhesive layer of resistance to boiling compound by plating aluminium oxide PET film and polyamide film;
3), by the corona layer of the polyamide film of described outer membrane and the cast polypropylene film of resistance to boiling be combined with each other by the first adhesive layer of resistance to boiling by solvent-free compound working procedure, finally obtain this packaging film.
Preferably, in described cooling and shaping operation, casting roller carries out quick cooling and shaping to hot melt film under air knife, the effect of vacuum tank servicing unit, and casting roller roll surface temperature is 20 ~ 30 DEG C; The gap of described air knife is 1 ~ 2mm, and the angle of air knife is 16%.
Beneficial effect of the present invention is as follows:
1), the skin of this packaging film have employed plating aluminium oxide PET film and ALOx-PET film.Plating aluminium oxide PET film has excellent transparent obstructive, microwave transparent and boiling resistance energy, and has that fresh-keeping guarantors is fragrant to be acted on, can with multiple flexible packages compound, fitness of process is good, can not to environment.
Plating aluminium oxide PET film functionally can substitute the barrier material such as existing PVDC, EVOH, aluminium foil, aluminizer, plating silicon oxide film, and successfully avoid the weak point of above various types of materials, is a kind of new packaging material with multinomial premium properties.
The intermediate layer of this packaging film is polyamide film and BOPA film, and BOPA film has excellent obdurability, tensile strength, percentage elongation and wearability.Select nylon film to be because it has good physical and mechanical properties, the withstand voltage, shock-resistant of product and the resistance to performance such as to fall can be strengthened after compound, content can well be protected, ensure the environmental suitability of product.BOPA nylon moderate cost, polyamide film is combined with outer ALOx-PET film, can improve barrier property and the environmental adaptability of composite membrane further.
The internal layer of this packaging film is can the cast polypropylene film of the resistance to boiling layer of resistance to 135 DEG C of thermophilic digestions and RCPP film.The described cast polypropylene film of resistance to boiling layer has good hot sticky performance, boiling resistance energy, has good foreign matter to be mingled with heat sealability.After thermophilic digestion, packaging bag can ensure not reveal, indeformable, not curling, not stratified.There is good physical and mechanical properties, the deflection of packaging can be promoted; Adapt to the normal operation of high-speed packaging device.
2), common adhesive after digested, be easy to lamination occurs, will cause packaging inefficacy, the quality problems such as appearance deformation.The first adhesive layer of resistance to boiling in the present invention and the second adhesive layer of resistance to boiling all have employed the type of resistance to boiling adhesive.The described type of resistance to boiling adhesive has that high solids content, low-viscosity, first viscous force are high, peel strength advantages of higher before and after boiling, and has the features such as higher food sanitation safe and quality stability.Adhesive for polyurethane is the same with other polymer, easily oxidation reaction occurs during high temperature, complexity oxidized when can evaluate its high temperature according to oxygen absorption rate.Therefore, when designing digestion resistant adhesive for polyurethane, should select can be hydrolyzed the material that shields and the slow material of oxygen absorption rate to carbon-oxygen bond.Namely the present invention has selected the Henkel double component solvent-free adhesive of resistance to boiling 7735/6088.
3) the RCPP film, in the present invention is the cast polypropylene film of resistance to boiling using three-layer co-extruded explained hereafter, and advantage is as follows:
A) RCPP film needs at high temperature high cooking, therefore the PP(polypropylene using good heat resistance is needed) resin, though homopolymerization PP resin temperature tolerance is good, but easy embrittlement in digestion process, cause the shock resistance of film to decline, therefore in the three-decker of RCPP film, all employ the block copolymerization PP resin simultaneously with good heat resistance and shock resistance;
B) to be mixed into SEBS elastomer further impact-resistant modified to carry out block copolymerization PP in the intermediate layer of RCPP film, improves pliability and the impact resilience of RCPP film.SEBS take polystyrene as end segment, and the ethylene-butene copolymer obtained with polybutadiene hydrogenation is the linear three embedding copolymers of middle spring block, has good weatherability, heat resistance, excellent mechanical property;
The performance of SEBS resin G2806GO is as follows: density 0.91g/cm
3, melt and refer to 5g/10min, styrene-content 30%.
C) in block copolymerization PP strand, distinctive Soft hard segment structure, outside the erosion-resisting characteristics of giving RCPP thin layer excellence, is also supplied to the heat sealability that RCPP thin layer is good, thus ensure that the packaging film in the present invention has higher sealing-strength;
D) block copolymerization PP resin F354NV distinctive surface coarsening effect in curtain coating machine-shaping process, can ensureing that RCPP thin layer is not when adding any slipping agent, opening agent, having suitable opening performance.
The performance of block copolymerization PP resin F354NV is as follows: density 0.91g/cm
3, melt and refer to 3.5g/10min, Vicat softening point 155 DEG C.
3), this packaging film barrier property is high, well can ensure the quality of content, extends the shelf cycle.
4), this packaging film can the thermophilic digestion of resistance to 135 DEG C, and sterilizing more comprehensively thoroughly.
5), this packaging film directly can carry out heating using microwave, can break a seal simply again edible, use safe ready more.
6), this packaging film transparent wrapper, be beneficial to observed content thing.
7), this packaging film heat sealability and sealing be good, and impact resistance is good, and physical and mechanical properties is excellent.
Accompanying drawing explanation
Fig. 1 is the structural representation of the high-barrier retort packaging film in the present invention.
Fig. 2 is the preparation flow figure of the high-barrier retort packaging film in the present invention.
The implication marked in figure is as follows:
10-plating aluminium oxide PET film layer 20-the first adhesive layer of resistance to boiling
30-polyamide film BOPA layer 40-the second adhesive layer of resistance to boiling
50-the cast polypropylene film of resistance to boiling RCPP layer
51-corona layer, 52-intermediate layer, 53-hot sealing layer
Detailed description of the invention
As shown in Figure 1, be convenient to a high-barrier retort packaging film for direct heating using microwave, this packaging film comprises plating aluminium oxide PET film layer 10, first adhesive layer of resistance to boiling 20, polyamide film BOPA layer 30, second adhesive layer of resistance to boiling 40 and the cast polypropylene film of the resistance to boiling RCPP layer 50 that fit successively; The described cast polypropylene film of resistance to boiling RCPP layer 50 is made up of the corona layer 51 be connected successively, intermediate layer 52 and hot sealing layer 53, and described corona layer 51 is adjacent with described second adhesive layer of resistance to boiling 40.
Described first adhesive layer of resistance to boiling 20 and the second adhesive layer of resistance to boiling 40 all adopt the double component solvent-free adhesive of resistance to boiling to make.
In Fig. 1, the thickness of described plating aluminium oxide PET film layer 10 is 12 μm, the thickness of the first adhesive layer of resistance to boiling 20 is 1 ~ 3 μm, the thickness of polyamide film BOPA layer 30 is 15 μm, the thickness of the second adhesive layer of resistance to boiling 40 is 1 ~ 3 μm.
Described corona layer 51 in Fig. 1 is block copolymerization polypropylene layer, and intermediate layer 52 is block copolymerization polypropylene and SEBS elastomer composite layer, and hot sealing layer 53 is block copolymerization polypropylene layer.
Further, described SEBS elastomer is Polystyrene-Polyethylene/polybutene-polystyrene.
Described corona layer 51, part by weight between intermediate layer 52 and hot sealing layer 53 three are 1:3:1; The percentage by weight of the block copolymerization polypropylene in described intermediate layer 52 is 80 ~ 85%, and the percentage by weight of Polystyrene-Polyethylene/polybutene-polystyrene is 15 ~ 20%.
Preferably, as shown in Figure 1, the thickness of described corona layer 51 is 15 ~ 20 μm, and the thickness in intermediate layer 52 is 60 ~ 70 μm, and the thickness of hot sealing layer 53 is 15 ~ 20 μm.
As shown in Figure 2, a kind of preparation method being convenient to the high-barrier retort packaging film of direct heating using microwave, it comprises the steps:
1), aluminium oxide PET film is plated by obtained through plating alumina technology for PET film;
And by the batching of the cast polypropylene film of resistance to boiling RCPP successively through extruding operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming operation prepare the cast polypropylene film of resistance to boiling RCPP, the described cast polypropylene film of resistance to boiling RCPP is made up of the corona layer 51 be connected successively, intermediate layer 52 and hot sealing layer 53;
2), then first outer membrane is obtained by the first adhesive layer of resistance to boiling compound by plating aluminium oxide PET film and polyamide film BOPA layer;
3), by the polyamide film BOPA layer of described outer membrane and the corona layer 51 of the cast polypropylene film of resistance to boiling RCPP be combined with each other by the first adhesive layer of resistance to boiling by solvent-free compound working procedure, finally obtain this packaging film.
In described cooling and shaping operation, casting roller carries out quick cooling and shaping to hot melt film under air knife, the effect of vacuum tank servicing unit, and casting roller roll surface temperature is 20 ~ 30 DEG C; The gap of described air knife is 1 ~ 2mm, and the angle of air knife is 16%.
Below in conjunction with specific embodiment, preparation process of the present invention is elaborated.
Embodiment 1
1) preparation of aluminium oxide PET film, is plated
Aluminium oxide PET film is plated by obtained through aluminium oxide evaporation process for PET film
Aluminium oxide evaporation coating technique is on the basis of traditional aluminum plating process, use radio frequency plasma treatment system to carry out surface cleaning and functionalization to evaporation base material and PET film, oxygen and aluminum vapor ionization are formed oxonium ion and aluminium ion by recycling Microwave plasma processing system; The oxonium ion and the aluminium ion that pass through ionization fully react formation aluminium oxide uniform deposition on PET film surface on top, evaporating area, thus form the transparent ALOx evaporation layer of one deck densification.
The preparation of RCPP film
The preparation of RCPP film comprises following operation successively: extrude operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming winding process.
A, extrude in operation: in three extruder hoppers of coextrusion casting machine, add corona layer resin raw material, intermediate layer resin raw material and hot sealing layer resin raw material respectively; Extrude operation and adopt three grades of heating, primary extruder temperature is: 210 DEG C, Secondary Extruder temperature: 225 DEG C, three grades extruder temperatures: 230 DEG C; Die head temperature: 225 DEG C.
Corona layer 51 is by F354NV(block copolymerization polypropylene) form.
Intermediate layer 52 is by F354NV(block copolymerization polypropylene) and G2806GO(Polystyrene-Polyethylene/polybutene-polystyrene) form, and the weight proportion of described F354NV and G2806GO is 80:20.
Hot sealing layer 53 is by F354NV(block copolymerization polypropylene) form.
Corona layer 51, weight ratio between intermediate layer 52 and hot sealing layer 53 three are 1:3:1.
In b, cooling and shaping operation: casting roller carries out quick cooling and shaping to hot melt film under the effect of the servicing unit such as air knife, vacuum tank, casting roller roll surface temperature is 30 DEG C, and roll surface temperature is even; The gap of described air knife is 2mm; The angle of air knife is 16%; Air knife position: 80%; Air knife speed: 35%; Air pressure: 4.8mbar; Vacuum tank wind speed: 25%; Vacuum tank pressure: 1.0mbar.
C, thickness measuring operation: in high-speed and continuous production process, the thickness measuring of film must use contactless tracking automatically to detect.In order to ensure the thickness uniformity of film, present invention employs beta thickness gauge.The β ray launched by radioactive source Kr85, through needing the film of detect thickness to be received by the receiver.The data measuring gained can process to computer by automatic feedback, automatically adjust die gap by die orifice thermal expansion bolt, and film thickness is kept evenly.
D, beat operation: deflection device is made up of beat frame and servomotor, thickness deviation accumulation is eliminated in effect, 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 makes film move left and right, and eliminates film thickness deviation accumulation transversely with this.
In e, corona operation: sided corona treatment power is 6.2KW, Corona roller pressure is 2.8bar, the wetting tension of corona surface reaches 42 dynes per centimeter; RCPP film is obtained after sided corona treatment.
F, trimming winding process: wrap-up sequence takes center clearance to batch mode, rolling starting voltage: 9000V; Rolling end voltage: 9500V; Change of lap voltage value added: 2500V; Corona roller drawing tension: 90N; Rear cold roller drawing tension: 95N; Change of lap tension force value added: 10/40N; Rolling drawing tension: 95N; Contact roller tension force: 100N; Contact roller pressure: 100N; Contact roller back pressure; 2.0bar; Rolling density: 90%.
3), plating aluminium oxide PET film (i.e. ALOx-PET film) is selected to be first unreel base material, then first is made to unreel base material under the tension of 140N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 90mm, the speed ratio of metering roll is 50%, and applicator roll is by pressure roller in addition 0.3Mpa/cm
2pressure, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on substrate surface, drying tunnel tension force is 102N; Second unreels base material parallel flattening under the tension of 120N, through doubling roller and heat bonding roller with 0.3Mpa/cm
2pressure and first unreel base material pressing.Bonding film, through chill roll rolling after cooling, obtains the outer membrane after certain coil diameter.In the process, metering roll temperature is 45 DEG C, and it is 50 DEG C that doubling roller temperature controls.
4) outer membrane obtained in step 3), is selected to be first unreel base material, then first is made to unreel base material under the tension of 200N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 80mm, the speed ratio of metering roll is 45%, and applicator roll is by pressure roller in addition 0.25Mpa/cm
2pressure, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on the surface of polyamide BOPA layer of base material, drying tunnel tension force is 100N; Second unreels base material parallel flattening under the tension of 70N, through doubling roller and heat bonding roller with 0.25Mpa/cm
2pressure and the first polyamide BOPA lamination that unreels base material close.Bonding film, through chill roll rolling after cooling, finally obtains this packaging film after certain coil diameter.In the process, metering roll temperature is 55 DEG C, and it is 65 DEG C that doubling roller temperature controls.
After packaging film preparation terminates, the different in width needed for consumer packaging, length, specification, cut rolling film by packaging film good for compound, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting volume film should 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 packaging film in the present embodiment, the thickness of described plating aluminium oxide PET film layer 10 is 12 μm, the thickness of the first adhesive layer of resistance to boiling 20 is 1 μm, the thickness of polyamide BOPA layer 30 is 15 μm, the thickness of the second adhesive layer of resistance to boiling 40 is 1 μm, the thickness of corona layer is 20 μm, and the thickness in intermediate layer is 60 μm, and the thickness of hot sealing layer is 20 μm.
Embodiment 2
1) preparation of aluminium oxide PET film, is plated
Aluminium oxide PET film is plated by obtained through aluminium oxide evaporation process for PET film
Aluminium oxide evaporation coating technique is on the basis of traditional aluminum plating process, use radio frequency plasma treatment system to carry out surface cleaning and functionalization to evaporation base material and PET film, oxygen and aluminum vapor ionization are formed oxonium ion and aluminium ion by recycling Microwave plasma processing system; The oxonium ion and the aluminium ion that pass through ionization fully react formation aluminium oxide uniform deposition on PET film surface on top, evaporating area, thus form the transparent ALOx evaporation layer of one deck densification.
The preparation of RCPP film
The preparation of RCPP film comprises following operation successively: extrude operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming winding process.
A, extrude in operation: in three extruder hoppers of coextrusion casting machine, add corona layer resin raw material, intermediate layer resin raw material and hot sealing layer resin raw material respectively; Extrude operation and adopt three grades of heating, primary extruder temperature is: 210 DEG C, Secondary Extruder temperature: 225 DEG C, three grades extruder temperatures: 230 DEG C; Die head temperature: 225 DEG C.
Corona layer 51 is by F354NV(block copolymerization polypropylene) form.
Intermediate layer 52 is by F354NV(block copolymerization polypropylene) and G2806GO(Polystyrene-Polyethylene/polybutene-polystyrene) form, and the weight proportion of described F354NV and G2806GO is 85:15.
Hot sealing layer 53 is by F354NV(block copolymerization polypropylene) form.
Corona layer 51, weight ratio between intermediate layer 52 and hot sealing layer 53 three are 1:3:1.
In b, cooling and shaping operation: casting roller carries out quick cooling and shaping to hot melt film under the effect of the servicing unit such as air knife, vacuum tank, casting roller roll surface temperature is 30 DEG C, and roll surface temperature is even; The gap of described air knife is 3mm; The angle of air knife is 16%; Air knife position: 80%; Air knife speed: 35%; Air pressure: 4.8mbar; Vacuum tank wind speed: 25%; Vacuum tank pressure: 1.0mbar.
C, thickness measuring operation: in high-speed and continuous production process, the thickness measuring of film must use contactless tracking automatically to detect.In order to ensure the thickness uniformity of film, present invention employs beta thickness gauge.The β ray launched by radioactive source Kr85, through needing the film of detect thickness to be received by the receiver.The data measuring gained can process to computer by automatic feedback, automatically adjust die gap by die orifice thermal expansion bolt, and film thickness is kept evenly.
D, beat operation: deflection device is made up of beat frame and servomotor, thickness deviation accumulation is eliminated in effect, 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 makes film move left and right, and eliminates film thickness deviation accumulation transversely with this.
In e, corona operation: sided corona treatment power is 6.2KW, Corona roller pressure is 2.8bar, the wetting tension of corona surface reaches 42 dynes per centimeter; RCPP film is obtained after sided corona treatment.
F, trimming winding process: winding process takes center clearance to batch mode, rolling starting voltage: 9000V; Rolling end voltage: 9500V; Change of lap voltage value added: 2500V; Corona roller drawing tension: 90N; Rear cold roller drawing tension: 95N; Change of lap tension force value added: 10/40N; Rolling drawing tension: 95N; Contact roller tension force: 100N; Contact roller pressure: 100N; Contact roller back pressure; 2.0bar; Rolling density: 90%.
3), plating aluminium oxide PET film (i.e. ALOx-PET film) is selected to be first unreel base material, then first is made to unreel base material under the tension of 120N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 80mm, the speed ratio of metering roll is 45%, and applicator roll is by pressure roller in addition 0.25Mpa/cm
2pressure, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on substrate surface, drying tunnel tension force is 100N; Second unreels base material parallel flattening under 100N tension, through doubling roller and heat bonding roller with 0.2Mpa/cm
2pressure and first unreel base material pressing.Bonding film, through chill roll rolling after cooling, obtains the outer membrane after certain coil diameter.In the process, metering roll temperature is 45 DEG C, and it is 50 DEG C that doubling roller temperature controls.
4) outer membrane obtained in step 3), is selected to be first unreel base material, then first is made to unreel base material under the tension of 180N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 80mm, the speed ratio of metering roll is 40%, and applicator roll is by pressure roller in addition 0.25Mpa/cm
2pressure, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on the surface of polyamide BOPA layer of base material, drying tunnel tension force is 99N; Second unreels base material parallel flattening under the tension of 60N, through doubling roller and heat bonding roller with suitable 0.2Mpa/cm
2pressure and the first polyamide BOPA lamination that unreels base material close.Bonding film, through chill roll rolling after cooling, finally obtains this packaging film after certain coil diameter.In the process, metering roll temperature is 55 DEG C, and it is 65 DEG C that doubling roller temperature controls.
After packaging film preparation terminates, the different in width needed for consumer packaging, length, specification, cut rolling film by packaging film good for compound, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting volume film should 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 packaging film in the present embodiment, the thickness of described plating aluminium oxide PET film layer 10 is 12 μm, the thickness of the first adhesive layer of resistance to boiling 20 is 1 μm, the thickness of polyamide BOPA layer 30 is 15 μm, the thickness of the second adhesive layer of resistance to boiling 40 is 1 μm, the thickness of corona layer is 15 μm, and the thickness in intermediate layer is 70 μm, and the thickness of hot sealing layer is 15 μm.
Embodiment 3
1) preparation of aluminium oxide PET film, is plated
Aluminium oxide PET film is plated by obtained through aluminium oxide evaporation process for PET film
Aluminium oxide evaporation coating technique is on the basis of traditional aluminum plating process, use radio frequency plasma treatment system to carry out surface cleaning and functionalization to evaporation base material and PET film, oxygen and aluminum vapor ionization are formed oxonium ion and aluminium ion by recycling Microwave plasma processing system; The oxonium ion and the aluminium ion that pass through ionization fully react formation aluminium oxide uniform deposition on PET film surface on top, evaporating area, thus form the transparent ALOx evaporation layer of one deck densification.
2), the preparation of RCPP film
The preparation of RCPP film comprises following operation successively: extrude operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming winding process.
A, extrude in operation: in three barrels of coextrusion machine, add corona layer resin raw material, intermediate layer resin raw material and hot sealing layer resin raw material respectively; Extrude operation and adopt three grades of heating, primary extruder temperature is: 210 DEG C, Secondary Extruder temperature: 225 DEG C, three grades extruder temperatures: 230 DEG C; Die head temperature: 225 DEG C.
Corona layer 51 is by F354NV(block copolymerization polypropylene) form.
Intermediate layer 52 is by F354NV(block copolymerization polypropylene) and G2806GO(Polystyrene-Polyethylene/polybutene-polystyrene) form, and the weight proportion of described F354NV and G2806GO is 82:18.
Hot sealing layer 53 is by F354NV(block copolymerization polypropylene) form.
Corona layer 51, weight ratio between intermediate layer 52 and hot sealing layer 53 three are 1:3:1.
In b, cooling and shaping operation: casting roller carries out quick cooling and shaping to hot melt film under the effect of the servicing unit such as air knife, vacuum tank, casting roller roll surface temperature is 30 DEG C, and roll surface temperature is even; The gap of described air knife is 3mm; The angle of air knife is 16%; Air knife position: 80%; Air knife speed: 35%; Air pressure: 4.8mbar; Vacuum tank wind speed: 25%; Vacuum tank pressure: 1.0mbar.
C, thickness measuring operation: in high-speed and continuous production process, the thickness measuring of film must use contactless tracking automatically to detect.In order to ensure the thickness uniformity of film, present invention employs beta thickness gauge.The β ray launched by radioactive source Kr85, through needing the film of detect thickness to be received by the receiver.The data measuring gained can process to computer by automatic feedback, automatically adjust die gap by die orifice thermal expansion bolt, and film thickness is kept evenly.
D, beat operation: deflection device is made up of beat frame and servomotor, thickness deviation accumulation is eliminated in effect, 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 makes film move left and right, and eliminates film thickness deviation accumulation transversely with this.
In e, corona operation: sided corona treatment power is 6.2KW, Corona roller pressure is 2.8bar, the wetting tension of corona surface reaches 42 dynes per centimeter; RCPP film is obtained after sided corona treatment.
F, trimming winding process: wrap-up sequence takes center clearance to batch mode, rolling starting voltage: 9000V; Rolling end voltage: 9500V; Change of lap voltage value added: 2500V; Corona roller drawing tension: 90N; Rear cold roller drawing tension: 95N; Change of lap tension force value added: 10/40N; Rolling drawing tension: 95N; Contact roller tension force: 100N; Contact roller pressure: 100N; Contact roller back pressure; 2.0bar; Rolling density: 90%.
3), plating aluminium oxide PET film (i.e. ALOx-PET film) is selected to be first unreel base material, then first is made to unreel base material under the tension of 100N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 70mm, the speed ratio of metering roll is gap is 40%, and applicator roll is by pressure roller in addition 0.2Mpa/cm
2pressure, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on substrate surface, drying tunnel tension force is 100N; Second unreels base material parallel flattening under the tension of 800N, through doubling roller and heat bonding roller with 0.3Mpa/cm
2pressure and first unreel base material pressing.Bonding film, through chill roll rolling after cooling, obtains the outer membrane after certain coil diameter.In the process, metering roll temperature is 45 DEG C, and it is 50 DEG C that doubling roller temperature controls.
4) outer membrane obtained in step 3), is selected to be first unreel base material, then first is made to unreel base material under the tension of 160N, parallel flattening coating system is entered after laterally rectifying a deviation, in coating system, the gap of metering roll is 75mm, the speed ratio of metering roll is 46%, and applicator roll is by the in addition suitable pressure 0.23Mpa/cm of pressure roller
2, make the double component solvent-free adhesive of resistance to boiling namely transfer to glue quantitative and even first and unreel on the surface of polyamide BOPA layer of base material, drying tunnel tension force is 101N; Second unreels base material under the tension of 58N, parallel flattening through doubling roller and heat bonding roller with 0.28Mpa/cm
2pressure and the first polyamide BOPA lamination that unreels base material close.Bonding film, through chill roll rolling after cooling, finally obtains this packaging film after certain coil diameter.In the process, metering roll temperature is 55 DEG C, and it is 65 DEG C that doubling roller temperature controls.
After packaging film preparation terminates, the different in width needed for consumer packaging, length, specification, cut rolling film by packaging film good for compound, to adapt to the requirement of user's automatic packaging machinery.The length and width specification of cutting volume film should 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 packaging film in the present embodiment, the thickness of described plating aluminium oxide PET film layer 10 is 12 μm, the thickness of the first adhesive layer of resistance to boiling 20 is 1 μm, the thickness of polyamide BOPA layer 30 is 15 μm, the thickness of the second adhesive layer of resistance to boiling 40 is 1 μm, the thickness of corona layer is 17 μm, and the thickness in intermediate layer is 65 μm, and the thickness of hot sealing layer is 18 μm.
RCPP film embodiment 1 to embodiment 3 prepared carries out mechanical property and heat sealability test, and test result lists in table 1.
The main performance technical indicator of table 1 RCPP film
The main performance technical indicator of the packaging film in above-mentioned three embodiments refers to table 2
The main performance technical indicator of table 2 packaging film
Testing result shows, the high-barrier retort packaging film cost being convenient to direct heating using microwave in the present invention is lower, easy to use, adaptation modernization automated packaging equipment fast, packaging speed is fast, and efficiency is high, can the thermophilic digestion of resistance to 135 DEG C, 40 minutes when sterilization.Flat appearance after packaging after boiling, aesthetic property is good, and sealing-strength is stablized, and not stratified, the shelf-life, longer security performance was good.Product is when in use, by heating using microwave, safe and convenient to use.This packaging film meets the demands for development such as the resistance to boiling of modernization and heating using microwave, safe and reliable.
Claims (9)
1. be convenient to a high-barrier retort packaging film for direct heating using microwave, it is characterized in that: this packaging film comprises plating aluminium oxide PET film layer (10), the first adhesive layer of resistance to boiling (20), BOPA thin layer (30), the second adhesive layer of resistance to boiling (40) and the cast polypropylene film of resistance to boiling (RCPP) layer (50) that fit successively; The described cast polypropylene film of resistance to boiling (RCPP) layer (50) is made up of the corona layer (51) be connected successively, intermediate layer (52) and hot sealing layer (53), and described corona layer (51) is adjacent with described second adhesive layer of resistance to boiling (40).
2. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 1, is characterized in that: described first adhesive layer of resistance to boiling (20) and the second adhesive layer of resistance to boiling (40) all adopt the double component solvent-free adhesive of resistance to boiling to make.
3. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 1, it is characterized in that: the thickness of described plating aluminium oxide PET film layer (10) is 12 μm, the thickness of the first adhesive layer of resistance to boiling (20) is 1 ~ 3 μm, the thickness of BOPA thin layer (30) is 15 μm, and the thickness of the second adhesive layer of resistance to boiling (40) is 1 ~ 3 μm.
4. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 1, it is characterized in that: described corona layer (51) is block copolymerization polypropylene layer, intermediate layer (52) for block copolymerization polypropylene and SEBS elastomer composite layer, hot sealing layer (53) be block copolymerization polypropylene layer.
5. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 4, is characterized in that: described SEBS elastomer is Polystyrene-Polyethylene/polybutene-polystyrene.
6. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 4, is characterized in that: described corona layer (51), part by weight between intermediate layer (52) and hot sealing layer (53) three are 1:3:1; The percentage by weight of the block copolymerization polypropylene in described intermediate layer (52) is 80 ~ 85%, and the percentage by weight of Polystyrene-Polyethylene/polybutene-polystyrene is 15 ~ 20%.
7. the high-barrier retort packaging film being convenient to direct heating using microwave according to claim 4, it is characterized in that: the thickness of described corona layer (51) is 15 ~ 20 μm, the thickness in intermediate layer (52) is 60 ~ 70 μm, and the thickness of hot sealing layer (53) is 15 ~ 20 μm.
8. the preparation method being convenient to the high-barrier retort packaging film of direct heating using microwave according to any one of claim 1 ~ 7, is characterized in that comprising the steps:
1), aluminium oxide PET film is plated by obtained through plating alumina technology for PET film;
And by the batching of the cast polypropylene film of resistance to boiling (RCPP) successively through extruding operation, cooling and shaping operation, thickness measuring operation, beat operation, corona operation, trimming winding process prepare the cast polypropylene film of resistance to boiling (RCPP), the described cast polypropylene film of resistance to boiling (RCPP) is made up of the corona layer (51) be connected successively, intermediate layer (52) and hot sealing layer (53);
2), then first outer membrane is obtained by the first adhesive layer of resistance to boiling compound by plating aluminium oxide PET film and BOPA thin layer (30);
3), by the BOPA thin layer (30) of described outer membrane and the corona layer (51) of the cast polypropylene film of resistance to boiling (RCPP) be combined with each other by the second adhesive layer of resistance to boiling by solvent-free compound working procedure, finally obtain this packaging film.
9. the preparation method being convenient to the high-barrier retort packaging film of direct heating using microwave according to claim 8, it is characterized in that: in described cooling and shaping operation, casting roller carries out quick cooling and shaping to hot melt film under air knife, the effect of vacuum tank servicing unit, and casting roller roll surface temperature is 20 ~ 30 DEG C; The gap of described air knife is 2 ~ 3mm, and the angle of air knife is 16%.
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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 |
| CN104371439B (en) * | 2014-10-15 | 2016-08-24 | 海南赛诺实业有限公司 | The plating pellumina of a kind of tack PVDC emulsion coating and manufacture method thereof |
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| US9725802B2 (en) | 2014-11-11 | 2017-08-08 | Graham Packaging Company, L.P. | Method for making pet containers with enhanced silicon dioxide barrier coating |
| CN108045044A (en) * | 2017-12-07 | 2018-05-18 | 上海久诚包装有限公司 | A kind of transparent high-barrier composite material and its production technology |
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| CN111516335B (en) * | 2020-04-22 | 2022-02-15 | 江阴宝柏包装有限公司 | High-temperature-digestion packaging film with high solvent resistance and low precipitation |
| CN113665211A (en) * | 2021-08-31 | 2021-11-19 | 江苏双星彩塑新材料股份有限公司 | Online coating boiling-resistant enhanced aluminized film |
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