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CN-121973527-A - Recyclable multifunctional fruit and vegetable fresh-locking packaging film and preparation method and application thereof

CN121973527ACN 121973527 ACN121973527 ACN 121973527ACN-121973527-A

Abstract

The application belongs to the technical field of food packaging films, and particularly relates to a recyclable multifunctional fruit and vegetable fresh-locking packaging film, a preparation method and application thereof; the recyclable multifunctional fresh-locking packaging film for fruits and vegetables comprises an inner film formed by at least one of polyolefin elastomer, metallocene polyethylene, low-density polyethylene and linear low-density polyethylene, and an outer film formed by at least one of outer film auxiliary agent, high-density polyethylene and ultra-high molar mass polyethylene, and the technical problem that the performance of the traditional packaging film for fruits and vegetables is poor is solved by differentiating the arrangement of raw materials of the inner and outer polyethylene films and doping antibacterial fresh-locking functional components, air-conditioning fresh-locking functional components and light-conditioning fresh-locking functional components.

Inventors

  • ZHANG WENNI

Assignees

  • 广州亿品鲜技术有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (10)

  1. 1. The recyclable multifunctional fruit and vegetable fresh-locking packaging film is characterized by comprising at least two layers of packaging films formed by melt coextrusion; the raw materials of the heat-sealable inner layer film in the at least two layers of packaging films comprise at least one of polyolefin elastomer, metallocene polyethylene, low-density polyethylene and linear low-density polyethylene; The raw materials of the outer layer film in the at least two layers of packaging films comprise at least one of outer layer film auxiliary agent, light-regulating fresh-locking functional component, air-regulating fresh-locking functional component, high-density polyethylene and ultra-high molar mass polyethylene; the light-modulating freshness-locking functional component is selected from a colorant and/or a color master batch which enable the outer layer film to be in one color of blue, purple, red, green, yellow, black and white.
  2. 2. The recyclable multi-functional fresh fruit and vegetable packaging film of claim 1, wherein the colorant is selected from one of pigment blue 15, pigment blue 16, ultramarine, pigment violet 9, pigment violet 23, pigment red 101, pigment red 122, pigment red 146, pigment red 166, pigment green 7, pigment green 17, pigment green 50, pigment yellow 42, pigment yellow 65, pigment yellow 83, carbon black, titanium pigment.
  3. 3. The recyclable multifunctional fruit and vegetable fresh-keeping packaging film according to claim 1, wherein the color master batch is selected from one of pigment blue 15, pigment blue 16, ultramarine blue, pigment violet 9, pigment violet 23, pigment red 101, pigment red 122, pigment red 146, pigment red 166, pigment green 7, pigment green 17, pigment green 50, pigment yellow 42, pigment yellow 65, pigment yellow 83, carbon black and titanium pigment, and the color master batch is made of polyethylene carrier resin.
  4. 4. The recyclable multifunctional packaging film for fresh-keeping and fresh-keeping of fruits and vegetables according to claim 1, wherein the fresh-keeping and fresh-keeping functional component is one of a breathable fresh-keeping functional component and a barrier fresh-keeping functional component.
  5. 5. The recyclable multifunctional fruit and vegetable fresh-locking packaging film according to claim 1, wherein the outer film auxiliary agent is at least one selected from a polyethylene compatilizer, a crystallization modifier and an anti-sticking auxiliary agent.
  6. 6. The recyclable multifunctional fruit and vegetable fresh-locking packaging film according to claim 1, wherein the at least two packaging films are a heat-sealable inner film and an outer film; The raw materials of the heat-sealable inner layer film comprise, by mass, 1-15 parts of polyolefin elastomer, 0.1-70 parts of metallocene polyethylene, 5-70 parts of low-density polyethylene, 5-70 parts of linear low-density polyethylene and 1-20 parts of antibacterial fresh-locking functional components; The raw materials of the outer layer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene, 0.1-5 parts of polyethylene compatilizer, 0.1-5 parts of crystallization modifier, 0.1-5 parts of anti-sticking auxiliary agent, 5-80 parts of high-density polyethylene, 0.5-5 parts of ultra-high molar mass polyethylene, 1-30 parts of modified atmosphere fresh-keeping functional components and 0.1-15 parts of colorant and/or color master batch.
  7. 7. The recyclable multifunctional fresh-locked packaging film for fruits and vegetables according to claim 1, wherein the at least two layers of packaging films are a heat-sealable inner film, a first outer film and a second outer film from inside to outside; The raw materials of the heat-sealable inner layer film comprise, by mass, 1-15 parts of polyolefin elastomer, 0.1-70 parts of metallocene polyethylene, 5-70 parts of low-density polyethylene, 5-70 parts of linear low-density polyethylene and 1-20 parts of antibacterial fresh-locking functional components; the raw materials of the first outer layer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene, 1-30 parts of modified atmosphere fresh-locking functional components and 0.1-15 parts of coloring agents and/or color master batches; The raw materials of the second outer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene, 0.1-5 parts of polyethylene compatilizer, 0.1-5 parts of crystallization modifier, 0.1-5 parts of anti-sticking auxiliary agent, 5-80 parts of high-density polyethylene and 0.5-5 parts of ultra-high molar mass polyethylene.
  8. 8. The recyclable multifunctional fresh-locked packaging film for fruits and vegetables according to claim 1, wherein the at least two packaging films are a heat-sealable inner film, a first outer film, a second outer film, a third outer film and a fourth outer film from inside to outside; The raw materials of the heat-sealable inner layer film comprise, by mass, 1-15 parts of polyolefin elastomer, 0.1-70 parts of metallocene polyethylene, 5-70 parts of low-density polyethylene and 5-70 parts of linear low-density polyethylene; The raw materials of the first outer layer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene and 1-20 parts of antibacterial fresh-locking functional components; the raw materials of the second outer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene and 1-30 parts of modified atmosphere fresh-locking functional components; The raw materials of the third outer layer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene and 0.1-15 parts of coloring agent and/or color master batch; The raw materials of the fourth outer layer film comprise, by mass, 5-80 parts of low-density polyethylene, 5-80 parts of linear low-density polyethylene, 0.1-5 parts of polyethylene compatilizer, 0.1-5 parts of crystallization modifier, 0.1-5 parts of anti-sticking auxiliary agent, 5-80 parts of high-density polyethylene and 0.5-5 parts of ultra-high molar mass polyethylene.
  9. 9. A method for preparing a recyclable multifunctional fruit and vegetable fresh-locking packaging film, which can prepare the recyclable multifunctional fruit and vegetable fresh-locking packaging film according to any one of claims 1-8, and comprises the steps of using a coextrusion film blowing device to melt and coextrude the raw materials of a heat-sealable inner layer film and an outer layer film.
  10. 10. Use of a recyclable multifunctional fruit and vegetable fresh-locking packaging film according to any one of claims 1-8 in the preparation of fruit and vegetable fresh-locking packaging products.

Description

Recyclable multifunctional fruit and vegetable fresh-locking packaging film and preparation method and application thereof Technical Field The application belongs to the technical field of food packaging films, and particularly relates to a recyclable multifunctional fruit and vegetable fresh-locking packaging film, and a preparation method and application thereof. Background The food packaging film is a film with a layered structure and generally comprises an outer film and a heat-sealable inner film, such as a layered film made of composite materials including polypropylene/polyethylene (BOPP/PE), polyethylene terephthalate/polyethylene (PET/PE) and the like, wherein the layered film made of the composite materials is difficult to separate after packaging food due to different materials of the inner layer and the outer layer and poor in compatibility, prevents recycling, is easy to cause environmental pollution and is poor in recycling performance. The inner layer and the outer layer are made of polyethylene food packaging films, so that the defect of recycling can be effectively overcome, but the conditions of melt wire drawing and heat sealing knife adhesion easily occur when heat sealing equipment is used for high-speed heat sealing, the heat sealing performance is poor, the heat sealing equipment needs to be cleaned, and the packaging efficiency and quality of a production line are affected; in addition, unlike the fresh-locking of meat foods mainly providing main foods such as rice with carbohydrate and mainly providing high-quality protein and fat, fruits and vegetables mainly providing vitamins and dietary fibers can continuously decompose self nutrient substances and consume water through respiration after picking, simultaneously synthesize and accumulate ethylene and cause deterioration of fruits and vegetables along with microorganism propagation, in addition, plant photoreceptors such as leuco pigment, photosensitive pigment and the like in fruits and vegetables can respond to light signals of different wave bands and regulate physiological processes such as respiratory metabolism, ethylene synthesis, antioxidation and the like, the color of the current food packaging film is usually colorless and transparent, and the light-regulating fresh-locking function is lacked, so that the current food packaging film lacks the pertinence improvement for the fresh locking of fruits and vegetables, the food packaging film is directly used for the fruit and vegetable packaging film and is easy to cause putrefaction, and the current food packaging film has poorer fresh-locking performance of fruits and vegetables and the shelf life of the current food packaging film is shorter. Along with the gradual improvement of the requirements of environmental protection, enterprise production efficiency, prolonging the shelf life of fruits and vegetables and the like, it is necessary to develop a packaging film for locking fruits and vegetables so as to improve the performance of the current food packaging film and make the packaging film meet the requirements of recycling, good heat sealing property, locking freshness and the like. Disclosure of Invention In view of the above, the application provides a recyclable multifunctional fruit and vegetable fresh-locking packaging film, a preparation method and application thereof, which are used for solving the technical problem of poor performance of the traditional fruit and vegetable packaging film. The first aspect of the application provides a recyclable multifunctional fruit and vegetable fresh-locking packaging film, which comprises at least two layers of packaging films formed by melt coextrusion; The raw materials of the heat-sealable inner layer film in the at least two layers of packaging films comprise at least one of polyolefin elastomer (POE, random copolymer of ethylene and alpha-olefin, ethylene content of 65% -85%), metallocene polyethylene (mPE), low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE); the raw materials of the outer layer film in the at least two layers of packaging films comprise at least one of outer layer film auxiliary agent, light-regulating fresh-locking functional component, air-regulating fresh-locking functional component, high Density Polyethylene (HDPE) and ultra-high molar mass polyethylene (UHMWPE); the light-modulating freshness-locking functional component is selected from a colorant and/or a color master batch which enable the outer layer film to be in one color of blue, purple, red, green, yellow, black and white. Preferably, the modified atmosphere fresh-locking functional component is selected from one of breathable modified atmosphere fresh-locking functional components and barrier modified atmosphere fresh-locking functional components. Preferably, the breathable modified atmosphere fresh-locking functional component is at least one selected from nano zeolite, active nano calcium carbonate, nano diat