CN110962424A - Recyclable high-barrier co-extrusion film for yeast packaging and preparation and recycling methods thereof - Google Patents
Recyclable high-barrier co-extrusion film for yeast packaging and preparation and recycling methods thereof Download PDFInfo
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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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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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
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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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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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
- 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
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
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Abstract
The recyclable high-barrier co-extrusion film for yeast packaging is a five-layer co-extrusion blow molding composite film, and comprises a first nylon layer, a second nylon layer, a copolymer layer of maleic acid and vinyl alcohol, a first polyethylene layer and a second polyethylene layer from the outer layer to the inner layer in sequence. The copolymer layer of the butenedioic acid and the vinyl alcohol is a water-soluble copolymer layer of the butenedioic acid and the vinyl alcohol, wherein the mass content of the vinyl alcohol is less than or equal to 16.7 percent. The recyclable high-barrier co-extrusion film for yeast packaging and the preparation and recycling methods thereof can solve the problem of incapability of recycling, can meet the high-barrier performance requirement, can be recycled, and meet the environmental protection requirement.
Description
Technical Field
The invention relates to the technical field of packaging, in particular to a recyclable high-barrier co-extruded film for yeast packaging and preparation and recycling methods thereof.
Background
Yeast is a unicellular fungus, belongs to facultative anaerobes, and is widely used in the food industry and the fermentation industry as a microbial thallus which is firstly industrialized by human beings. The active dry yeast is an organism in a hibernation state, and can wake up after meeting water and an environment with sugar, reproduce, grow and lose activity. Recently, the Instant active dry yeast (Instant active dry yeast), also called high active dry yeast, is made by adopting genetic engineering and modern drying technology, and compared with the active dry yeast, the moisture content is lower, only 4% -6%, most of the Instant active dry yeast is light yellow round or rod-shaped particles, the particle size is generally 0.5mm, (the fermentation speed is fast, the yeast can be directly used without pre-hydration when in use, at present, domestic and foreign yeast companies mainly adopt aluminum-plastic composite films for vacuum packaging to be put into markets with specifications of 500 g/bag, 100 g/bag and the like, the shelf life (quality guarantee period) is 1-2 years, the aluminum-plastic composite film packaging mainly has the function of barrier property, namely air and oxygen are isolated, so that the yeast is in a 'hibernation state', polyethylene is a product obtained by performing polyaddition chemical reaction on petroleum cracking product ethylene, has excellent chemical stability and biocompatibility, heat-sealing property, therefore, a polyethylene film is often used as an inner layer material of an aluminum-plastic composite film for direct contact with yeast.
The multilayer co-extrusion composite film is widely used for packaging products such as rice, meat products, cooked food, fish products and the like as a novel packaging material, the packaging material generally takes polypropylene (PP) or Polyethylene (PE) as a base material, and high-barrier functional material layers are designed to be formed by co-extrusion technology such as nylon resin, ethylene-vinyl alcohol copolymer resin, adhesive resin and the like to form the multilayer materialCoextruded films, but the only disadvantages present are: the resins are mixed and cannot be separated and recovered. In addition, world-wide famous yeast companies such as lawsford (Lesaffre), english-lian-malli (AB Mauri), angelia yeast (angell) are currently mainly using polyethylene terephthalate/aluminum foil/polyethylene terephthalate/polyethylene (PET/AL/PET/PE) four-layer structure composite film for yeast commodity packaging, wherein the printing layer is 12 micron thick polyethylene terephthalate film, the barrier layer is 7 micron or 9 micron thick aluminum foil, the heat seal layer is polyethylene film, and the layers are bonded with polyurethane adhesive to form the aluminum-plastic composite film. The barrier property of the aluminum-plastic composite membrane can reach oxygen transmission capacity (OTR) less than or equal to 0.897cm3/(m224h 0.1MPa), Water Vapor Transmission (WVT) of 0.346 g/(m)224h), there are also certain drawbacks: the aluminum foil can not be recycled, and white pollution which is harmful to the environment is formed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a recyclable high-barrier co-extrusion film for yeast packaging and a preparation and recycling method thereof, which can solve the problem of incapability of recycling, can meet the requirement of high-barrier performance, can be recycled, and meets the requirement of environmental protection.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the recyclable high-barrier co-extrusion film for yeast packaging is a five-layer co-extrusion blow molding composite film, and comprises a first nylon layer, a second nylon layer, a copolymer layer of maleic acid and vinyl alcohol, a first polyethylene layer and a second polyethylene layer from the outer layer to the inner layer in sequence.
Preferably, the copolymer layer of the butenedioic acid and the vinyl alcohol is a water-soluble copolymer layer of the butenedioic acid and the vinyl alcohol, wherein the mass content of the vinyl alcohol is less than or equal to 16.7 percent.
Preferably, the thickness of the co-extruded film is 80-110 microns, and the thickness ratio of the first nylon layer to the second nylon layer is as follows: a second nylon layer: butene diacid and vinyl alcohol copolymer layer: first polyethylene layer: the second polyethylene layer was 1:2:1:2: 1.
A preparation method of the recyclable high-barrier co-extruded film comprises the following steps: drying the PA, PE and BVoH resin particles, heating and melting the particles by a five-layer co-extrusion extruder, extruding the particles, wherein the bubble blow-up ratio is 1.5-2.0, the particles are rolled and drawn to a preheating roller by a drawing roller mechanism, the temperature of the preheating roller is 40-50 ℃, the drawing speed is 30-40 m/min, the drawing ratio is 1.5, the film is drawn longitudinally on line by a drawing roller, the drawing multiple is 1.5-2.0, the on-line longitudinal drawing temperature is 95-110 ℃, the drawn film is annealed by an annealing roller and cooled by a cooling roller, the annealing temperature is 60-80 ℃, the cooling temperature is 20 ℃, and the recyclable high-barrier co-extrusion film special for yeast packaging is obtained after rolling.
Preferably, the resin raw materials of each layer are dried by a fluidized bed at 100 ℃ so that the water content of the resin raw materials is extruded below 0.05 percent, the extrusion temperature of the nylon resin is 250-290 ℃, the extrusion temperature of the polyethylene resin is 160-190 ℃, and the resin extrusion temperature of the butenedioic acid-vinyl alcohol copolymer is 140-170 ℃.
Preferably, the nylon resin of the first nylon layer and the second nylon layer is nylon 6 resin.
Preferably, the resin of the copolymer of butenedioic acid and vinyl alcohol is a highly water-soluble resin.
Preferably, the polyethylene resin is a low density polyethylene resin.
The recycling method of the recyclable high-barrier co-extruded film comprises the following steps: crushing the used high-barrier co-extrusion film waste for yeast packaging, putting the crushed waste into a warm water medium at 50-75 ℃, quickly dissolving and separating to form a floating object on the polyethylene fragments and a sinking object on the nylon fragments, and recovering the floating object on the polyethylene fragments and the sinking object on the nylon fragments to directly use for extrusion granulation so as to realize recycling.
According to the recyclable high-barrier co-extrusion film for yeast packaging and the preparation and recovery methods thereof, the nylon 6 resin film as a packaging material has good surface printing characteristic, low high temperature resistance, puncture resistance and excellent oxygen resistance, and is widely used for packaging outer layer film materials. The low-density polyethylene material belongs to petrochemical cracking products, is non-toxic and harmless, and is the polymer with the best biocompatibility at presentOne of the materials, has good heat sealing property, is very suitable for the requirement of production line type automatic packaging of yeast products, and is widely used for packaging outer layer film materials. The copolymer (BVOH) resin of butenedioic acid and vinyl alcohol is a high-efficiency water-soluble resin material, and is proved by experiments to have optimal solubility in an aqueous solution at 50-75 ℃ when the thickness of the resin is controlled to be 15-25 microns as an intermediate material of a film, and simultaneously, the oxygen transmission capacity (OTR) is less than or equal to 0.5cm3/(m224h 0.1MPa), Water Vapor Transmission (WVT) is less than or equal to 0.5 g/(m)224h) barrier requirements. After the five-layer co-extruded film is crushed, BVOH is quickly dissolved in a warm water medium, the supernatant is polyethylene, and the sediment is nylon 6, so that the five-layer co-extruded film can be recycled after separation; the problem that the existing plastic-aluminum film cannot be recycled can be solved, the high-barrier performance requirement can be met, the film can be recycled, the environmental protection requirement is met, the prepared high-barrier co-extrusion film has good tensile strength and heat-sealing strength, the transverse tensile strength is 121.8-153.1N/15mm, the longitudinal tensile strength is 121.8-132.6N/15mm, and the heat-sealing strength is 94.4-105.2N/15 mm; the prepared high-barrier co-extrusion film has good barrier property, and is greatly superior to the existing plastic-aluminum film.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural view of a recyclable high-barrier co-extruded film according to the present invention;
FIG. 2 is a schematic diagram of a recyclable high barrier co-extruded film of the present invention after recycling.
Detailed Description
Example one
As shown in figure 1, the recyclable high-barrier co-extruded film for yeast packaging is a five-layer co-extruded blow molding composite film, and comprises a first nylon layer 1, a second nylon layer 2, a copolymer layer of maleic acid and vinyl alcohol 3, a first polyethylene layer 4 and a second polyethylene layer 5 from the outer layer to the inner layer in sequence.
The butenedioic acid-vinyl alcohol copolymer layer 3 is a water-soluble butenedioic acid-vinyl alcohol copolymer layer, wherein the mass content of vinyl alcohol is less than or equal to 16.7 percent.
The thickness of the co-extruded film is 80-110 microns, and the thickness ratio of the layers is that the first nylon layer 1: second nylon layer 2: butene diacid and vinyl alcohol copolymer layer 3: first polyethylene layer 4: the second polyethylene layer 5 (PA/BVOH/PE) is 1:2:1:2: 1.
Example two
A preparation method of the recyclable high-barrier co-extruded film comprises the following steps: drying the PA, PE and BVoH resin particles, heating and melting the particles by a five-layer co-extrusion extruder, extruding the particles by the five-layer co-extrusion extruder, wherein the bubble blow-up ratio is 1.5-2.0, the particles are rolled and drawn to a preheating roller by a drawing roller mechanism, the drawing speed is 30-40 m/min, the drawing ratio is 1.5, the film is longitudinally drawn on line by a drawing roller, the drawn film is annealed by an annealing roller and cooled by a cooling roller, the cooling temperature is 20 ℃, and the recyclable high-barrier co-extrusion film special for yeast packaging is obtained after winding.
The resin raw materials of each layer are dried by a fluidized bed at 100 ℃ so that the water content is extruded below 0.05 percent, the extrusion temperature of the nylon resin is 250-290 ℃, the extrusion temperature of the polyethylene resin is 160-190 ℃, and the resin extrusion temperature of the copolymer of the butenedioic acid and the vinyl alcohol is 140-170 ℃.
After the film is formed by air cooling, a six-roller stretching process is adopted in a longitudinal MDO stretching device, and the temperature of a preheating roller 1 is set as follows: 40 ℃; the temperature of the preheating roll 2 was set to: 50 ℃; the stretching roll 1 temperature was set to: 95 ℃; the temperature of the stretching roll 2 was set to: 100 ℃; the annealing roller 1 temperature was set to: 80 ℃; the annealing roller 2 temperature was set to: and (3) forming a finished product of a nylon/butylene diacid and vinyl alcohol copolymer/polyethylene (PA/PA/BVOH/PE/PE) co-extruded film with the stretching ratio of 2.0 at the temperature of 60 ℃.
Physical and chemical performance indexes of the original aluminum plastic film and the co-extruded film of the embodiment are compared
EXAMPLE III
A preparation method of the recyclable high-barrier co-extruded film comprises the following steps: drying the PA, PE and BVoH resin particles, heating and melting the particles by a five-layer co-extrusion extruder, extruding the particles by the five-layer co-extrusion extruder, wherein the bubble blow-up ratio is 1.5-2.0, the particles are rolled and drawn to a preheating roller by a drawing roller mechanism, the drawing speed is 30-40 m/min, the drawing ratio is 1.5, the film is longitudinally drawn on line by a drawing roller, the drawn film is annealed by an annealing roller and cooled by a cooling roller, the cooling temperature is 20 ℃, and the recyclable high-barrier co-extrusion film special for yeast packaging is obtained after winding.
The resin raw materials of each layer are dried by a fluidized bed at 100 ℃ so that the water content is extruded below 0.05 percent, the extrusion temperature of the nylon resin is 250-290 ℃, the extrusion temperature of the polyethylene resin is 160-190 ℃, and the resin extrusion temperature of the copolymer of the butenedioic acid and the vinyl alcohol is 140-170 ℃.
After the film is formed by air cooling, a six-roller stretching process is adopted in a longitudinal MDO stretching device, and the temperature of a preheating roller 1 is set as follows: 45 ℃; the temperature of the preheating roll 2 was set to: 50 ℃; the stretching roll 1 temperature was set to: 95 ℃; the temperature of the stretching roll 2 was set to: 110 ℃; the annealing roller 1 temperature was set to: 75 ℃; the annealing roller 2 temperature was set to: and (3) forming a finished product of a nylon/butenedioic acid and vinyl alcohol copolymer/polyethylene (PA/PA/BVOH/PE/PE) co-extruded film at the temperature of 60 ℃ and with the stretching ratio of 1.8.
Physical and chemical performance indexes of the original aluminum plastic film and the co-extruded film of the embodiment are compared
Example four
A preparation method of the recyclable high-barrier co-extruded film comprises the following steps: drying the PA, PE and BVoH resin particles, heating and melting the particles by a five-layer co-extrusion extruder, extruding the particles by the five-layer co-extrusion extruder, wherein the bubble blow-up ratio is 1.5-2.0, the particles are rolled and drawn to a preheating roller by a drawing roller mechanism, the drawing speed is 30-40 m/min, the drawing ratio is 1.5, the film is longitudinally drawn on line by a drawing roller, the drawn film is annealed by an annealing roller and cooled by a cooling roller, the cooling temperature is 20 ℃, and the recyclable high-barrier co-extrusion film special for yeast packaging is obtained after winding.
The resin raw materials of each layer are dried by a fluidized bed at 100 ℃ so that the water content is extruded below 0.05 percent, the extrusion temperature of the nylon resin is 250-290 ℃, the extrusion temperature of the polyethylene resin is 160-190 ℃, and the resin extrusion temperature of the copolymer of the butenedioic acid and the vinyl alcohol is 140-170 ℃.
After the film is formed by air cooling, a six-roller stretching process is adopted in a longitudinal MDO stretching device, and the temperature of a preheating roller 1 is set as follows: 40 ℃; the temperature of the preheating roll 2 was set to: 50 ℃; the stretching roll 1 temperature was set to: 95 ℃; the temperature of the stretching roll 2 was set to: 105 ℃; the annealing roller 1 temperature was set to: 80 ℃; the annealing roller 2 temperature was set to: and (3) forming a finished product of a nylon/butenedioic acid and vinyl alcohol copolymer/polyethylene (PA/PA/BVOH/PE/PE) co-extruded film at 65 ℃ with the stretching ratio of 1.5.
Physical and chemical performance indexes of the original aluminum plastic film and the co-extruded film of the embodiment are compared
In the second to fourth embodiments, the nylon resin of the first nylon layer 1 and the second nylon layer 2 is a blown film grade nylon 6 resin produced by basf corporation.
The resin of the copolymer of the butenedioic acid and the vinyl alcohol is a high water-soluble resin produced by Nippon Weibao (Verbatim), wherein the content of the vinyl alcohol is less than or equal to 16.7 percent.
The polyethylene resin is a low density polyethylene resin.
EXAMPLE five
As shown in fig. 2, a recycling method of the recyclable high-barrier co-extruded film includes: crushing the used high-barrier co-extrusion film waste for yeast packaging, putting the crushed waste into a warm water medium at 50-75 ℃, quickly dissolving and separating to form a polyethylene fragment upper floating object 6 and a nylon fragment lower sinking object 7, and recovering the polyethylene fragment upper floating object 6 and the nylon fragment lower sinking object 7 for direct extrusion granulation to realize recycling.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (9)
1. The utility model provides a yeast packaging is with recoverable high resistant separates coextrusion film which characterized in that: the co-extrusion film is a five-layer co-extrusion blow molding composite film, and is composed of a first nylon layer (1), a second nylon layer (2), a butenedioic acid and vinyl alcohol copolymer layer (3), a first polyethylene layer (4) and a second polyethylene layer (5) from the outer layer to the inner layer in sequence.
2. The recyclable high-barrier co-extruded film for yeast packaging according to claim 1, wherein: the butenedioic acid-vinyl alcohol copolymer layer (3) is a water-soluble butenedioic acid-vinyl alcohol copolymer layer, wherein the mass content of vinyl alcohol is less than or equal to 16.7 percent.
3. The recyclable high-barrier co-extruded film for yeast packaging according to claim 1, wherein: the thickness of the co-extruded film is 80-110 microns, and the thickness ratio of the layers is that the first nylon layer (1): second nylon layer (2): butene diacid and vinyl alcohol copolymer layer (3): first polyethylene layer (4): the second polyethylene layer (5) =1:2:1:2: 1.
4. A method for preparing the recyclable high-barrier co-extruded film as described in any one of claims 1 to 3, wherein the method comprises the following steps: drying the PA, PE and BVoH resin particles, heating and melting the particles by a five-layer co-extrusion extruder, extruding the particles, wherein the bubble blow-up ratio is 1.5-2.0, the particles are rolled and drawn to a preheating roller by a drawing roller mechanism, the temperature of the preheating roller is 40-50 ℃, the drawing speed is 30-40 m/min, the drawing ratio is 1.5, the film is drawn longitudinally on line by a drawing roller, the drawing multiple is 1.5-2.0, the on-line longitudinal drawing temperature is 95-110 ℃, the drawn film is annealed by an annealing roller and cooled by a cooling roller, the annealing temperature is 60-80 ℃, the cooling temperature is 20 ℃, and the recyclable high-barrier co-extrusion film special for yeast packaging is obtained after rolling.
5. The method of claim 4, wherein: the resin raw materials of each layer are dried by a fluidized bed at 100 ℃ so that the water content is extruded below 0.05 percent, the extrusion temperature of the nylon resin is 250-290 ℃, the extrusion temperature of the polyethylene resin is 160-190 ℃, and the resin extrusion temperature of the copolymer of the butenedioic acid and the vinyl alcohol is 140-170 ℃.
6. The method of claim 4, wherein: the nylon resin of the first nylon layer (1) and the second nylon layer (2) is nylon 6 resin.
7. The method of claim 4, wherein: the resin of the copolymer of the butenedioic acid and the vinyl alcohol is a highly water-soluble resin.
8. The method of claim 4, wherein: the polyethylene resin is a low density polyethylene resin.
9. A recycling method of the recyclable high-barrier co-extruded film as described in claims 1-3, characterized in that the method comprises: crushing the used high-barrier co-extrusion film waste for yeast packaging, putting the crushed waste into a warm water medium at 50-75 ℃, quickly dissolving and separating to form a floating object on the polyethylene fragments and a sinking object on the nylon fragments, and recovering the floating object on the polyethylene fragments and the sinking object on the nylon fragments to directly use for extrusion granulation so as to realize recycling.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002265665A (en) * | 2001-03-12 | 2002-09-18 | Toray Ind Inc | Method for recovering mold release film |
| CN1652976A (en) * | 2002-05-21 | 2005-08-10 | 吴羽化学工业株式会社 | Bottle excellent in recyclability and method for recycling the bottle |
| CN105729954A (en) * | 2014-12-09 | 2016-07-06 | 宜昌宏裕塑业有限责任公司 | High-activity semi-dry yeast composite packaging film |
| CN106163810A (en) * | 2014-04-03 | 2016-11-23 | 吉慕莎有限公司 | Recyclable material |
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2019
- 2019-12-25 CN CN201911357592.1A patent/CN110962424A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002265665A (en) * | 2001-03-12 | 2002-09-18 | Toray Ind Inc | Method for recovering mold release film |
| CN1652976A (en) * | 2002-05-21 | 2005-08-10 | 吴羽化学工业株式会社 | Bottle excellent in recyclability and method for recycling the bottle |
| CN106163810A (en) * | 2014-04-03 | 2016-11-23 | 吉慕莎有限公司 | Recyclable material |
| CN105729954A (en) * | 2014-12-09 | 2016-07-06 | 宜昌宏裕塑业有限责任公司 | High-activity semi-dry yeast composite packaging film |
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Application publication date: 20200407 |