CN111806015A - Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof - Google Patents

Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof Download PDF

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Publication number
CN111806015A
CN111806015A CN202010699438.9A CN202010699438A CN111806015A CN 111806015 A CN111806015 A CN 111806015A CN 202010699438 A CN202010699438 A CN 202010699438A CN 111806015 A CN111806015 A CN 111806015A
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layer
polypropylene
packaging film
food packaging
temperature
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刘�东
张宝轩
王学广
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SHANDONG QILU ETHYLENE CHEMICA
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SHANDONG QILU ETHYLENE CHEMICA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention belongs to the technical field of food packaging films, and particularly relates to a polypropylene high-temperature easy-to-tear food packaging film and a preparation method thereof. The above-mentionedThe food packaging film comprises a layer A, a layer B, a layer C, a layer D, a layer E, a layer F and a layer G in sequence from outside to inside from the cross section, wherein the layer A and the layer C are both nylon, the layer B and the layer D are both adhesive resin, the layer E and the layer F are both random copolymer polypropylene, the layer G is a heat sealing layer and is a blending modified resin of random copolymer polypropylene, low density polyethylene and linear low density polyethylene, the melting index of the blending modified resin is 6.0-6.3G/10min, and the density is 0.905-0.908G/cm3. The polypropylene high-temperature easy-to-tear food packaging film disclosed by the invention has better seal easy-to-tear property after heat sealing on the basis of ensuring the mechanical property of the packaging film, has proper adhesive force between two heat sealing layers, has no burr trace after being torn, and improves the use convenience of customers.

Description

Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof
Technical Field
The invention belongs to the technical field of food packaging films, and particularly relates to a polypropylene high-temperature easy-to-tear food packaging film and a preparation method thereof.
Background
The packaging film has great market potential, and the easy-to-open package is divided into an easy-to-tear type and an easy-to-tear type according to different opening modes. The easy-to-tear package mainly controls the heat seal strength of the packaging material, so that the packaging material can not only have a sealing effect after being subjected to heat seal, but also can be torn off by damaging the heat seal layer with proper force. The ideal functional composite film which aims at easy tearing needs to have the following characteristics: (1) when a consumer opens the food packaging bag, a relatively ideal cracking effect is needed at a place needing cracking; (2) on the premise of ensuring the safety of the food in the container, the tearing propagation force is as small as possible, and the tearing is convenient.
Polypropylene, also known as PP, is a thermoplastic resin prepared by polymerizing propylene, and is non-toxic, odorless, tasteless and reliable in hygienic property; the paint is resistant to acid, alkali, salt and various chemical substances, and has stable performance; the physical and mechanical properties are balanced; the moisture resistance and the moisture resistance are excellent, and certain oxygen resistance is realized; has excellent formability and good heat-sealing property. The polypropylene can resist the high temperature of more than 120 ℃, and the polypropylene film packaged food can even bear the requirement of high-temperature cooking of more than 140 ℃.
The existing polypropylene three-layer composite film can keep the shape and flavor of internal food and has excellent dimensional stability after being subjected to high-temperature cooking sterilization, the cooking type polypropylene film is used for packaging marinated eggs, chicken, pork ribs, beverages and the like and can meet the requirement of high-temperature sterilization at the temperature of 121-.
Disclosure of Invention
The purpose of the invention is: provides a polypropylene food packaging film easy to tear off at high temperature. The packaging film has excellent mechanical property, and is still easy to uncover after being steamed at high temperature; the invention also provides a preparation method thereof.
The polypropylene high-temperature easy-uncovering food packaging film provided by the invention sequentially comprises an A layer, a B layer, a C layer, a D layer, an E layer, an F layer and a G layer from outside to inside from the cross section of the packaging film, wherein the A layer and the C layer have the same components and are both nylon, the B layer and the D layer have the same components and are both adhesive resin, the E layer and the F layer have the same components and are both random copolymerization polypropylene, the G layer is a heat sealing layer and is a blending modified resin of random copolymerization polypropylene, low density polyethylene and linear low density polyethylene, the melting index of the blending modified resin is 6.0-6.3G/10min, and the density is 0.905-0.908G/cm3。
Wherein:
the thickness of the polypropylene high-temperature easy-uncovering food packaging film is 60-240um, and the thickness of the layer A, the layer B, the layer C, the layer D, the layer E, the layer F and the layer G accounts for 13-14% respectively: 13-14%: 13-14%: 13-14%: 14-15%: 14-15%: 14 to 15 percent.
The mass of the random copolymerization polypropylene in the heat sealing layer accounts for 70-80% of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 10-15% of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 10-15% of the mass of the blending modified resin.
The blending resin of the heat sealing layer is mutually matched, so that the corresponding quality of food is ensured while the strength required by packaging is ensured, and people can easily uncover the heat sealing edge, thereby providing convenience for customers.
The density of the nylon of the layer A and the layer C is 1.13-1.17g/cm3。
The nylon of the A layer and the C layer is one of PA-6, PA-610 or PA-1010, preferably PA-6.
The adhesive resin of the layer B and the layer D is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90-0.91g/cm3Melt and meltThe melt index is 4.0-7.0g/10 min.
The density of the random copolymerized polypropylene of the E layer and the F layer is 0.908-0.915g/cm3The melt index is 6.0-8.0g/10 min.
As a preferred technical scheme, the polypropylene high-temperature easy-uncovering food packaging film is a seven-layer composite film, which sequentially comprises an A layer, a B layer, a C layer, a D layer, an E layer, an F layer and a G layer from outside to inside from the cross section of the packaging film, wherein:
the layer A is made of nylon with the density of 1.15-1.17g/cm3The nylon is PA-6;
the layer B is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90-0.91g/cm3The melt index is 6.0-7.0g/10 min;
the layer C is PA-6, and the density of the PA-6 is 1.15-1.17g/cm3；
The layer D is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90-0.91g/cm3The melt index is 6.0-7.0g/10 min;
the component of the E layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.910-0.915g/cm3The melt index is 7.0-8.0g/10 min;
the component of the F layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.910-0.915g/cm3The melt index is 7.0-8.0g/10 min;
the G layer is a heat sealing layer and is a blending modified resin of random copolymerization polypropylene, low density polyethylene and linear low density polyethylene, the melt index of the blending modified resin is 6.0-6.3G/10min, and the density is 0.905-0.908G/cm3(ii) a The mass of the random copolymerization polypropylene in the heat sealing layer accounts for 70-80% of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 10-15% of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 10-15% of the mass of the blending modified resin.
The layer A and the layer C are added with nylon to improve the barrier property, the outer layer nylon is resistant to scratch and can be printed, the layer B and the layer D have the adhesion effect, the layer G has the heat-sealing and easy-tearing effect, the layer E and the layer F are matched with other layers, and the high-performance polypropylene high-temperature easy-tearing food packaging film is prepared by comprehensively considering the cost, the elongation, the stiffness, the transparency and the thickness uniformity of a formed film.
The preparation method of the polypropylene high-temperature easy-uncovering food packaging film comprises the following steps: melting and extruding the raw materials of the layer A, the layer B, the layer C, the layer D, the layer E, the layer F and the layer G respectively through an extruder, converging the raw materials at a die head through respective flow channels, shaping through a film opening air ring, cooling through a water ring, entering a first traction device for stretching and exhausting, enabling the thick and thin points of the film to be uniformly distributed on a reel through a rotary traction device, entering a second traction device for drying at the temperature of less than or equal to 100 ℃, then rectifying in a rectifying device, entering a third traction device for drawing the film, and finally rolling through a film guiding device and a rolling device to obtain the polypropylene high-temperature easy-uncovering food packaging film.
A herringbone clamping plate is arranged in the first traction device, and the function of shaping the film is achieved.
As a preferred technical scheme, the preparation method of the polypropylene high-temperature easy-uncovering food packaging film comprises the following steps:
(1) proportionally adding the raw materials of the layer A into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 240-280 ℃ to form a layer A molten material; adding the raw materials of the layer B into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 180-260 ℃ to form a layer B molten material; proportionally adding the raw materials of the layer C into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 240-280 ℃ to form a molten material of the layer C; adding the raw materials of the layer D into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 180-260 ℃ to form a molten material of the layer D; proportionally adding the raw materials of the E layer into a stirrer to be uniformly stirred, and carrying out blending extrusion at the melting temperature of 175-260 ℃ to form a molten material of the E layer; adding the raw materials of the F layer into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 175-260 ℃ to form a molten material of the F layer; proportionally adding the raw materials of the G layer into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 170-250 ℃ to form a molten material of the G layer; the molten materials of each layer enter a co-extrusion die head with the temperature of 220-270 ℃ through respective flow passages to be co-extruded with the materials from other extruders.
(2) The high-temperature easy-to-tear food packaging film is formed by shaping the film opening through a wind ring, cooling the water ring, enabling the water ring to enter a first traction device for stretching and exhausting treatment, enabling thick and thin points of the film to be uniformly distributed on a scroll through a rotary traction device, enabling the film to enter a second traction device for drying at the temperature of less than or equal to 100 ℃, then rectifying in a rectifying device, enabling the film to enter a third traction device for film drawing, and finally enabling the film to pass through a film guide device and a winding device for winding to obtain the high-temperature easy-to-tear.
Compared with the prior art, the invention has the following beneficial effects:
(1) the polypropylene high-temperature easy-to-tear food packaging film disclosed by the invention has better seal easy-to-tear property after heat sealing on the basis of ensuring the mechanical property of the packaging film, has proper adhesive force between two heat sealing layers, has no burr trace after being torn, and improves the use convenience of customers.
(2) The preparation method of the polypropylene high-temperature easy-uncovering food packaging film has the advantages of wide raw material source, simple preparation process and low energy consumption, obviously improves the high-temperature resistance of the packaging film, and is suitable for large-scale production.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
This embodiment 1 polypropylene high temperature easily takes off food packaging film, for seven layers of complex films, begin from the packaging film cross section and be A layer, B layer, C layer, D layer, E layer, F layer and G layer from outside to inside in proper order, wherein:
the layer A is made of nylon with the density of 1.17g/cm3The nylon is PA-6;
the layer B is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90g/cm3The melt index is 6.0g/10 min;
the layer C is PA-6, and the density of the PA-6 is 1.17g/cm3；
The layer D is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90g/cm3The melt index is 6.0g/10 min;
the component of the E layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.908g/cm3The melt index is 6.0g/10 min;
the component of the F layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.908g/cm3The melt index is 6.0g/10 min;
the G layer is a heat sealing layer and is a blending modified resin of random copolymerization polypropylene, low density polyethylene and linear low density polyethylene, the melt index of the blending modified resin is 6.3G/10min, and the density is 0.908G/cm3。
The mass of the random copolymerization polypropylene in the heat sealing layer accounts for 70% of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 15% of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 15% of the mass of the blending modified resin.
The thickness of polypropylene high temperature easily take off food packaging film be 180um, the thickness of A layer, B layer, C layer, D layer, E layer, F layer, G layer account for than respectively 14%: 14%: 14%: 14%: 15%: 15%: 14 percent; namely, the A layer is 25.2um, the B layer is 25.2um, the C layer is 25.2um, the D layer is 25.2um, the E layer is 27.0um, the F layer is 27.0um, and the G layer is 25.2 um.
The preparation method of the polypropylene high-temperature easy-to-tear food packaging film described in this embodiment 1 comprises the following steps:
(1) adding the raw materials of the layer A into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 270 +/-10 ℃ to form a layer A molten material; adding the raw materials of the layer B into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 200 +/-10 ℃ to form a layer B molten material; adding the raw materials of the layer C into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 270 +/-10 ℃ to form a layer C molten material; adding the raw materials of the layer D into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 200 +/-10 ℃ to form a molten material of the layer D; adding the raw materials of the E layer into a stirrer according to a proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 195 +/-10 ℃ to form a molten material of the E layer; adding the raw materials of the F layer into a stirrer according to a certain proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 195 +/-10 ℃ to form a molten material of the F layer; adding raw materials of the G layer into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 200 +/-10 ℃ to form a molten material of the G layer; the molten materials of each layer enter a co-extrusion die with the temperature of 240 +/-10 ℃ through respective flow passages to be co-extruded with the materials from other extruders.
(2) The high-temperature easy-to-tear food packaging film is formed by shaping the air ring at the film opening, cooling the water ring, enabling the water ring to enter a first traction device for stretching and exhausting treatment, enabling thick and thin points of the film to be uniformly distributed on a scroll by rotating the traction device, enabling the thick and thin points to enter a second traction device for drying at the temperature of 90 +/-5 ℃, then rectifying in a rectifying device, enabling the thick and thin points to enter a third traction device for film drawing, and finally, rolling through a film guiding device and a rolling device to obtain the high-temperature easy-to-tear food packaging film.
Example 2
This embodiment 2 polypropylene high temperature easily takes off food packaging film, for seven layers of complex films, begin from the packaging film cross section and be A layer, B layer, C layer, D layer, E layer, F layer and G layer from outside to inside in proper order, wherein:
the layer A is made of nylon with the density of 1.15g/cm3The nylon is PA-610;
the layer B is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.905g/cm3The melt index is 6.5g/10 min;
the layer C is PA-610, and the density of the PA-610 is 1.15g/cm3；
The layer D is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.905g/cm3The melt index is 6.5g/10 min;
the component of the E layer is random copolymerization polypropylene,the density of the random copolymerized polypropylene is 0.910g/cm3The melt index is 7.2g/10 min;
the component of the F layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.910g/cm3The melt index is 7.2g/10 min;
the G layer is a heat sealing layer and is a blending modified resin of random copolymerization polypropylene, low density polyethylene and linear low density polyethylene, the melt index of the blending modified resin is 6.0G/10min, and the density is 0.905G/cm3g/cm3。
The mass of the random copolymerization polypropylene in the heat sealing layer accounts for 75 percent of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 13 percent of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 12 percent of the mass of the blending modified resin.
The thickness of polypropylene high temperature easily tearing food packaging film be 200um, the thickness of A layer, B layer, C layer, D layer, E layer, F layer, G layer account for than respectively 14%: 14%: 14%: 14%: 15%: 15%: 14 percent; namely, the A layer is 28um, the B layer is 28um, the C layer is 28um, the D layer is 28um, the E layer is 30um, the F layer is 30um, and the G layer is 28 um.
The preparation method of the polypropylene high-temperature easy-to-tear food packaging film described in this embodiment 2 comprises the following steps:
(1) adding the raw materials of the layer A into a stirrer according to a proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 250 +/-10 ℃ to form a layer A molten material; adding the raw materials of the layer B into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 230 +/-10 ℃ to form a layer B molten material; adding the raw materials of the layer C into a stirrer according to a proportion, uniformly stirring, and performing blending extrusion at a melting temperature of 250 +/-10 ℃ to form a layer C molten material; adding the raw materials of the layer D into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 230 +/-10 ℃ to form a molten material of the layer D; adding the raw materials of the E layer into a stirrer according to a proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 220 +/-10 ℃ to form a molten material of the E layer; adding the raw materials of the F layer into a stirrer according to a certain proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 220 +/-10 ℃ to form a molten material of the F layer; adding raw materials of the G layer into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 230 +/-10 ℃ to form a molten material of the G layer; the molten materials of each layer enter a co-extrusion die with the temperature of 250 +/-10 ℃ through respective flow passages to be co-extruded with the materials from other extruders.
(2) The high-temperature easy-to-tear food packaging film is formed by shaping the air ring at the film opening, cooling the water ring, enabling the water ring to enter a first traction device for stretching and exhausting treatment, enabling thick and thin points of the film to be uniformly distributed on a scroll by rotating the traction device, enabling the thick and thin points to enter a second traction device for drying at the temperature of 90 +/-5 ℃, then rectifying in a rectifying device, enabling the thick and thin points to enter a third traction device for film drawing, and finally, rolling through a film guiding device and a rolling device to obtain the high-temperature easy-to-tear food packaging film.
Example 3
This embodiment 3 polypropylene high temperature easily takes off food packaging film, for seven layers of complex films, begin from the packaging film cross section and be A layer, B layer, C layer, D layer, E layer, F layer and G layer from outside to inside in proper order, wherein:
the layer A is made of nylon with the density of 1.16g/cm3The nylon is PA-1010;
the layer B is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.91g/cm3The melt index is 7.0g/10 min;
the layer C is PA-1010, and the density of the PA-1010 is 1.16g/cm3；
The layer D is adhesive resin, the adhesive resin is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.91g/cm3The melt index is 7.0g/10 min;
the component of the E layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.915g/cm3The melt index is 8.0g/10 min;
the component of the F layer is random copolymerization polypropylene, and the density of the random copolymerization polypropylene is 0.915g/cm3The melt index is 8.0g/10 min;
the G layer is a heat sealing layer and is made of random copolymer polypropylene, low density polyethylene and linear low density polyethyleneThe ethylene blending modified resin has the melt index of 6.2g/10min and the density of 0.907g/cm3g/cm3。
The mass of the random copolymerization polypropylene in the heat sealing layer accounts for 80 percent of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 10 percent of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 10 percent of the mass of the blending modified resin.
The thickness of polypropylene high temperature easily take off food packaging film be 240um, the thickness on A layer, B layer, C layer, D layer, E layer, F layer, G layer account for than respectively 14%: 14%: 14%: 14%: 15%: 15%: 14 percent; the A layer is 33.6um, the B layer is 33.6um, the C layer is 33.6um, the D layer is 33.6um, the E layer is 36um, the F layer is 36um, and the G layer is 33.6 um.
The preparation method of the polypropylene high-temperature easy-to-tear food packaging film described in this embodiment 3 comprises the following steps:
(1) adding the raw materials of the layer A into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 260 +/-10 ℃ to form a layer A molten material; adding the raw materials of the layer B into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 250 +/-10 ℃ to form a layer B molten material; adding the raw materials of the layer C into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 260 +/-10 ℃ to form a layer C molten material; adding the raw materials of the layer D into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 250 +/-10 ℃ to form a molten material of the layer D; adding the raw materials of the E layer into a stirrer according to a proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 250 +/-10 ℃ to form a molten material of the E layer; adding the raw materials of the F layer into a stirrer according to a certain proportion, uniformly stirring, and carrying out blending extrusion at a melting temperature of 250 +/-10 ℃ to form a molten material of the F layer; adding raw materials of the G layer into a stirrer in proportion, uniformly stirring, and performing blending extrusion at a melting temperature of 240 +/-10 ℃ to form a molten material of the G layer; the molten materials of each layer enter a co-extrusion die with the temperature of 260 +/-10 ℃ through respective flow passages to be co-extruded with the materials from other extruders.
(2) The high-temperature easy-to-tear food packaging film is formed by shaping the air ring at the film opening, cooling the water ring, enabling the water ring to enter a first traction device for stretching and exhausting treatment, enabling thick and thin points of the film to be uniformly distributed on a scroll by rotating the traction device, enabling the thick and thin points to enter a second traction device for drying at the temperature of 90 +/-5 ℃, then rectifying in a rectifying device, enabling the thick and thin points to enter a third traction device for film drawing, and finally, rolling through a film guiding device and a rolling device to obtain the high-temperature easy-to-tear food packaging film.
Comparative example 1
The food packaging film of comparative example 1 is the same as that of example 3, except that the composition of the raw materials of the heat-sealing layer of the G layer is different, the G layer is the heat-sealing layer and is a blending resin of binary random copolymer polypropylene and ternary random copolymer polypropylene, and the blending modified resin has a melt index of 6.2G/10min and a density of 0.907G/cm3g/cm3。
The weight of the binary random copolymerization polypropylene in the heat sealing layer accounts for 50 percent of the weight of the blending modified resin, and the weight of the ternary random copolymerization polypropylene accounts for 50 percent of the weight of the blending modified resin.
The food packaging films prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance tests, and the results are shown in table 1:
Figure BDA0002592475350000071

Claims (8)

1. a polypropylene high-temperature easy-uncovering food packaging film is characterized in that: the packaging film comprises an A layer, a B layer, a C layer, a D layer, an E layer, an F layer and a G layer in sequence from outside to inside from the cross section of the packaging film, wherein the A layer and the C layer are the same in component and are both nylon, the B layer and the D layer are the same in component and are both adhesive resin, the E layer and the F layer are the same in component and are both random copolymer polypropylene, the G layer is a heat sealing layer and is a blending modified resin of random copolymer polypropylene, low-density polyethylene and linear low-density polyethylene, the melting index of the blending modified resin is 6.0-6.3G/10min, and the density is 0.905-0.908G/cm3。
2. The polypropylene high temperature easy-open food packaging film according to claim 1, wherein: the thickness of the polypropylene high-temperature easy-uncovering food packaging film is 60-240um, and the thickness of the layer A, the layer B, the layer C, the layer D, the layer E, the layer F and the layer G accounts for 13-14% respectively: 13-14%: 13-14%: 13-14%: 14-15%: 14-15%: 14 to 15 percent.
3. The polypropylene high temperature easy-open food packaging film according to claim 1, wherein: the mass of the random copolymerization polypropylene in the heat sealing layer accounts for 70-80% of the mass of the blending modified resin, the mass of the low density polyethylene accounts for 10-15% of the mass of the blending modified resin, and the mass of the linear low density polyethylene accounts for 10-15% of the mass of the blending modified resin.
4. The polypropylene high temperature easy-open food packaging film according to claim 1, wherein: the density of the nylon of the layer A and the layer C is 1.13-1.17g/cm3(ii) a The nylon of the A layer and the C layer is one of PA-6, PA-610 or PA-1010.
5. The polypropylene high temperature easy-open food packaging film according to claim 1, wherein: the adhesive resin of the layer B and the layer D is maleic anhydride grafted polypropylene resin, and the density of the maleic anhydride grafted polypropylene resin is 0.90-0.91g/cm3The melt index is 4.0-7.0g/10 min.
6. The polypropylene high temperature easy-open food packaging film according to claim 1, wherein: the density of the random copolymerized polypropylene of the E layer and the F layer is 0.908-0.915g/cm3The melt index is 6.0-8.0g/10 min.
7. The preparation method of the polypropylene high-temperature easy-uncovering food packaging film of claim 1 is characterized in that: melting and extruding the raw materials of the layer A, the layer B, the layer C, the layer D, the layer E, the layer F and the layer G respectively through an extruder, converging the raw materials at a die head through respective flow channels, shaping through a film opening air ring, cooling through a water ring, entering a first traction device for stretching and exhausting, enabling the thick and thin points of the film to be uniformly distributed on a reel through a rotary traction device, entering a second traction device for drying at the temperature of less than or equal to 100 ℃, then rectifying in a rectifying device, entering a third traction device for drawing the film, and finally rolling through a film guiding device and a rolling device to obtain the polypropylene high-temperature easy-uncovering food packaging film.
8. The method for preparing the polypropylene high-temperature easy-uncovering food packaging film according to claim 7, characterized in that: the method comprises the following steps:
(1) proportionally adding the raw materials of the layer A into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 240-280 ℃ to form a layer A molten material; adding the raw materials of the layer B into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 180-260 ℃ to form a layer B molten material; proportionally adding the raw materials of the layer C into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 240-280 ℃ to form a molten material of the layer C; adding the raw materials of the layer D into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 180-260 ℃ to form a molten material of the layer D; proportionally adding the raw materials of the E layer into a stirrer to be uniformly stirred, and carrying out blending extrusion at the melting temperature of 175-260 ℃ to form a molten material of the E layer; adding the raw materials of the F layer into a stirrer in proportion, uniformly stirring, and performing blending extrusion at the melting temperature of 175-260 ℃ to form a molten material of the F layer; proportionally adding the raw materials of the G layer into a stirrer to be uniformly stirred, and performing blending extrusion at the melting temperature of 170-250 ℃ to form a molten material of the G layer; the molten materials of each layer enter a co-extrusion die head with the temperature of 220-270 ℃ through respective flow passages to be co-extruded with the materials from other extruders;
(2) the high-temperature easy-to-tear food packaging film is formed by shaping the film opening through a wind ring, cooling the water ring, enabling the water ring to enter a first traction device for stretching and exhausting treatment, enabling thick and thin points of the film to be uniformly distributed on a scroll through a rotary traction device, enabling the film to enter a second traction device for drying at the temperature of less than or equal to 100 ℃, then rectifying in a rectifying device, enabling the film to enter a third traction device for film drawing, and finally enabling the film to pass through a film guide device and a winding device for winding to obtain the high-temperature easy-to-tear.
CN202010699438.9A 2020-07-20 2020-07-20 Polypropylene high-temperature easy-to-tear food packaging film and preparation method thereof Pending CN111806015A (en)

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