CN114851582A - Coating process of shading preservative paper - Google Patents

Coating process of shading preservative paper Download PDF

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Publication number
CN114851582A
CN114851582A CN202210510516.5A CN202210510516A CN114851582A CN 114851582 A CN114851582 A CN 114851582A CN 202210510516 A CN202210510516 A CN 202210510516A CN 114851582 A CN114851582 A CN 114851582A
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China
Prior art keywords
coating
film
shading
layer
solution
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Pending
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CN202210510516.5A
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Chinese (zh)
Inventor
陈晓彬
董云渊
郑启富
张敏
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Quzhou University
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Quzhou University
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Priority to CN202210510516.5A priority Critical patent/CN114851582A/en
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    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/521—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by spin coating
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/522—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by spraying, e.g. by flame spraying
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7318—Permeability to gases or liquids
    • B29C66/73181—Permeability to gases or liquids permeable
    • B29C66/73182—Permeability to gases or liquids permeable to gases
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7318—Permeability to gases or liquids
    • B29C66/73181—Permeability to gases or liquids permeable
    • B29C66/73183—Permeability to gases or liquids permeable to liquids
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/748—Joining plastics material to non-plastics material to natural products or their composites, not provided for in groups B29C66/742 - B29C66/746
    • B29C66/7486—Paper, e.g. cardboard
    • 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
    • B29K2201/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as reinforcement
    • 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
    • B29K2307/00—Use of elements other than metals as reinforcement
    • B29K2307/04—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/005—Layered products coated
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
    • 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
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

The invention discloses a coating process of shading preservative paper, in particular to the technical field of food preservation, and specifically comprises the following operation steps: step 1, preparation work; step 2, prefabricating a base layer film; step 3, coating a shading layer; step 4, coating a fresh-keeping layer; step 5, compacting; and 6, coating the antibacterial agent. When the five-layer composite preservative paper is coated, the bamboo charcoal fiber film is used as a framework, the two surfaces of the framework of the base layer film are bonded with the light shielding films through the adhesive, the surface of the light shielding layer is coated with the modified cellulose solution to form a composite structure which takes the base layer film as the framework and extends towards the two surfaces of the framework respectively, and the light shielding layer and the preservative layer are coated on the two sides of the composite structure in sequence in the same coating mode, so that a five-layer composite preservative paper secondary structure is formed, and the preservation effect of the whole preservative paper is further improved on the basis of ensuring light shielding and preservation.

Description

Coating process of shading preservative paper
Technical Field
The invention relates to the technical field of food preservation, in particular to a coating process of shading preservative paper.
Background
Fresh fruits and vegetables are fresh and alive products with high water content and occupy a very important part in agricultural and sideline products, and the fresh fruits and vegetables can continue to perform life activities such as breathing activity, transpiration and the like after being picked, so that the fresh fruits and vegetables are inconvenient to package and transport, and the fresh-keeping paper technology is developed in order to ensure the freshness of the fresh fruits and vegetables in the packaging and transporting process.
With the increase of market demands, the types of the preservative paper are numerous, the preservative paper is convenient to degrade, the preservative paper is convenient to shield light, and the like, the existing preservative paper can be applied to a coating process in the production process, a layer of preservative layer is usually coated on a paper framework by a coating roller during coating, so that the preservative paper is formed, but in actual use, the defects still exist, for example, the preservative effect of the preservative paper is poor due to the traditional coating process.
Disclosure of the invention
In order to overcome the above drawbacks of the prior art, embodiments of the present invention provide a coating process for a light-shielding fresh-keeping paper, so as to solve the problems mentioned in the above background art.
In order to achieve the purpose, the invention provides the following technical scheme: a coating process of shading preservative paper specifically comprises the following operation steps:
step 1: preparing raw materials, namely 100-150 parts of cellulose, 20-30 parts of bamboo charcoal fiber, 25-35 parts of sucrose ester, 5-8 parts of antibacterial agent, 3-5 parts of modifier, 0.5-1.0 part of emulsifier, 0.3-0.5mm thick light shielding film and 6-9 parts of adhesive by weight;
step 2: prefabricating a base layer film, treating 20-30 parts of bamboo charcoal fiber prepared in the step 1, 3-5 parts of a modifier and 0.5-1.0 part of an emulsifier, preparing the bamboo charcoal fiber into a bamboo charcoal fiber solution, adding the modifier and a softener to modify the bamboo charcoal fiber into a modified mixed solution, and finally evaporating the modified solution on a constant-temperature tray to dryness to generate the base layer film;
and step 3: coating a shading layer, namely placing the base layer film generated in the step 2 into a coating machine, and bonding the shading film prepared in the step 1 and the base layer film generated in the step 2 by using an adhesive to generate a composite film;
and 4, step 4: coating a fresh-keeping layer, treating the 100-150 parts of cellulose prepared in the step 1 and 25-35 parts of sucrose ester, preparing the cellulose into a cellulose solution, adding the sucrose ester to modify the cellulose solution into a modified cellulose solution, and finally coating the modified cellulose solution on a light shielding layer by using a coating roller to generate the fresh-keeping layer;
and 5: compacting, namely placing the semi-finished preservative paper coated with the light shielding layer and the preservative layer at a workbench, and extruding the semi-finished preservative paper at the workbench by a pressure plate with the pressure of 80-120 pa to generate compacted preservative paper;
step 6: and (3) coating an antibacterial agent, namely placing the compacted preservative paper prepared in the step (6) into a coating machine, and coating 5-8 parts of the antibacterial agent prepared in the step (1) on the surface of the preservative layer through a coating roller to generate the finished preservative paper.
In a preferred embodiment, the specific operation steps for preparing the base paper layer in step 2 are as follows:
step 201: preparing a bamboo charcoal fiber solution, placing 20-30 parts of the bamboo charcoal fiber prepared in the step 1 into a grinding kettle for grinding, grinding the bamboo charcoal fiber into powder with the fineness of 400-plus 500 meshes, placing the bamboo charcoal fiber powder inside the grinding kettle into a mixing kettle, adding sufficient deionized water into the mixing kettle, controlling the temperature in the mixing kettle to be 30-35 ℃, and fully mixing for 35-45 minutes to obtain a viscous bamboo charcoal fiber solution;
step 202: preparing a modified mixed solution, placing the bamboo charcoal fiber solution generated in the step 201 in a stirring kettle, continuously adding 0.5-1.0 part of emulsifier and 3-5 parts of modifier into the stirring kettle, controlling the temperature in the stirring kettle to be 25 ℃, controlling the stirring speed to be 300-400r/min, and stirring for 35-45 minutes in a counterclockwise manner so that the mixture in the stirring kettle has granular texture to generate the modified mixed solution;
step 203: and (3) prefabricating a base layer film, uniformly coating the modified mixed solution prepared in the step (202) on a constant-temperature tray, and after a layer of the modified mixed solution is coated, waiting for the constant-temperature tray to evaporate the solution to dryness to form a layer of colloidal film, namely the base layer film.
In a preferred embodiment, the temperature of the thermostatic tray in the step 203 is controlled to be 25-35 ℃, the thickness of the modified mixed solution on the thermostatic tray is set to be 3-5mm each time, and the thermostatic tray is controlled to be evaporated for 3-5 minutes to obtain a colloidal film with the thickness of 1-2 mm.
In a preferred embodiment, the step 3 specifically includes the following steps:
step 301: pre-connecting, namely coating an adhesive on one surface of the shading film with the thickness of 0.3-0.5mm prepared in the step 1 by using a coating roller;
step 302: double-film connection, namely placing the base layer thin film generated in the step 2 on a coating flat plate of a coating machine, and coating the shading film coated with the adhesive in the step 301 on at least one surface of the base layer thin film by using a coating roller to generate a composite film adhered with the shading film;
step 303: preheating, namely integrally heating the human composite membrane generated in the step 302 to 40-50 ℃, and integrally heating the outer layer to 50-60 ℃, so that the bonding effect of the composite membrane is improved, and the thickness is reduced.
In a preferred embodiment, when the light-shielding film is coated with the adhesive in step 301, the light-shielding film is first placed on a coating platform, the light-shielding film is flattened by a coating roller, and then the adhesive is sprayed on the surface of the light-shielding film and flattened by the coating roller.
In a preferred embodiment, the operation of the step 302 when the light-shielding film is adhered to both sides of the base film is as follows: the method comprises the steps of adhering a shading film on one surface of a base layer film, reversely arranging a composite film, exposing the other surface of the base layer film, and further adhering the shading film on the other surface, so that the shading films are adhered on the two surfaces of the base layer film.
In a preferred embodiment, the step 4 specifically includes the following steps:
step 401: preparing a cellulose solution, placing 150 parts of 100-one cellulose prepared in the step 1 in a grinding kettle B, controlling the grinding rate in the grinding kettle B to be 60-75r/min, and grinding for 44-46 minutes to obtain cellulose powder with the particle size meeting the requirement; placing cellulose powder with the particle size meeting the specification into a mixing kettle B, adding sufficient deionized water into the mixing kettle B, controlling the temperature in the mixing kettle B to be 30-35 ℃, and fully mixing for 10-20 minutes to generate a cellulose solution;
step 402: preparing a modified cellulose solution, placing the cellulose solution generated in the step 401 in a reaction kettle B, further continuously adding 25-35 parts of sucrose ester prepared in the step 1 into the reaction kettle B, controlling the temperature in the reaction kettle B to be 20-25 ℃, and controlling the reaction time to be 30-40 minutes, so that the solution in the reaction kettle B is colloidal, namely the modified cellulose solution;
step 403: and (3) injecting the modified cellulose solution generated in the step (402) into a coating machine, continuously coating the modified cellulose solution on the surface of the light shielding layer by a coating roller, wherein the thickness of the coated modified cellulose solution is 4.2-4.4mm, and enabling the modified cellulose solution coated on the surface of the light shielding layer to be in a jelly state by using a constant-temperature tray, namely, the fresh-keeping layer.
In a preferred embodiment, the particle size of the milled cellulose powder in step 401 is controlled to be 0.05-0.06mm, and the thickness of the freshness protection layer in step 403 is controlled to be 3.6-3.8 mm.
In a preferred embodiment, the coating rolls used in steps 2-4 are all the same type of coating roll.
In a preferred embodiment, the thickness of the preservative paper extruded in the step 5 is 2.0-2.2 mm.
The invention has the technical effects and advantages that:
1. when coating, the bamboo charcoal fiber film is used as a framework, the two sides of the framework of the base layer film are bonded with the shading films through adhesives to form a sandwich type composite film, the surface of the shading layer is coated with the modified cellulose solution, the modified cellulose solution generates a colloidal preservative layer to form a composite structure which takes the base layer film as the framework and extends towards the two sides of the framework respectively, and the shading layer and the preservative layer are coated on the two sides of the framework in sequence in the same coating mode, so that a five-layer composite preservative paper laminated structure is formed, and the preservation effect of the whole preservative paper is further improved on the basis of ensuring shading preservation;
2. the preservative paper produced by the coating process designed by the invention has high light transmittance in the use process, the bamboo charcoal fiber is used as a base material, the moisture absorption and air permeability characteristics are ensured by the micropores of the bamboo charcoal fiber, the shading effect of the preservative paper is realized by the shading layer, and the food is preserved by the preservative layer formed by the modified limiting solution on the shading layer.
Drawings
Fig. 1 is a schematic view of a coating process flow proposed by the present invention.
FIG. 2 is a schematic flow chart of the steps set forth in step 2 of the present invention.
FIG. 3 is a schematic flow chart of the steps in step 3 of the present invention.
FIG. 4 is a schematic flow chart illustrating the steps in step 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a coating process of shading preservative paper, which specifically comprises the following operation steps:
step 1: preparing 100 parts of cellulose, 20 parts of bamboo charcoal fiber, 25 parts of sucrose ester, 5 parts of antibacterial agent, 3 parts of modifier, 0.5 part of emulsifier, 0.3mm thick shading film and 6 parts of adhesive;
step 2: prefabricating a base layer film, treating 20 parts of bamboo charcoal fiber prepared in the step 1, 3 parts of modifier and 0.5 part of emulsifier, preparing the bamboo charcoal fiber into a bamboo charcoal fiber solution, adding the modifier and a softener to modify the bamboo charcoal fiber into a modified mixed solution, and finally evaporating the modified solution on a constant-temperature tray to dryness to generate the base layer film, wherein the specific operation steps are as follows:
step 201: preparing a bamboo charcoal fiber solution, placing 20 parts of the bamboo charcoal fiber prepared in the step 1 into a grinding kettle for grinding, grinding the bamboo charcoal fiber into powder with the fineness of 400 meshes, placing the bamboo charcoal fiber powder inside the grinding kettle into a mixing kettle, adding sufficient deionized water into the mixing kettle, controlling the temperature inside the mixing kettle to be 30 ℃, and fully mixing for 35 minutes to obtain a viscous bamboo charcoal fiber solution;
step 202: preparing a modified mixed solution, placing the bamboo charcoal fiber solution generated in the step 201 in a stirring kettle, continuously adding 0.5 part of emulsifier and 3 parts of modifier into the stirring kettle, controlling the temperature in the stirring kettle to be 25 ℃, controlling the stirring speed to be 300r/min, and stirring for 35 minutes in a counterclockwise manner to enable the mixture in the stirring kettle to have granular texture, thereby generating the modified mixed solution;
step 203: and (3) prefabricating a base layer film, uniformly coating the modified mixed solution prepared in the step (202) on a constant-temperature tray, after coating a layer of the modified mixed solution, waiting for the constant-temperature tray to evaporate the solution to dryness to form a layer of colloidal film, namely the base layer film, wherein the temperature of the constant-temperature tray is controlled to be 25 ℃, the thickness of the modified mixed solution coated on the constant-temperature tray every time is set to be 3mm, and the constant-temperature tray is controlled to evaporate to dryness for 3 minutes to obtain the colloidal film with the thickness of 1 mm.
And step 3: coating a shading layer, namely placing the base layer film generated in the step 2 into a coating machine, and bonding the shading film prepared in the step 1 and the base layer film generated in the step 2 by using an adhesive to generate a composite film, wherein the specific operation steps are as follows:
step 301: pre-connecting, namely coating an adhesive on one surface of the shading film with the thickness of 0.3mm prepared in the step 1 by using a coating roller, wherein when the adhesive is coated on the shading film in the step 301, the shading film is firstly placed on a coating platform, the shading film is flattened by using the coating roller, then the adhesive is sprayed on the surface of the shading film, and the flattening treatment is carried out by using the coating roller;
step 302: double-film connection, namely placing the base layer thin film generated in the step 2 on a coating flat plate of a coating machine, and coating the shading film coated with the adhesive in the step 301 on the surface of the base layer thin film by using a coating roller to generate a composite film adhered with the shading film;
step 303: preheating, namely integrally heating the human composite membrane generated in the step 302 to 40 ℃, and integrally heating the outer layer to 50 ℃, so that the bonding effect of the composite membrane is improved, and the thickness is reduced.
And 4, step 4: coating a fresh-keeping layer, treating 100 parts of cellulose and 25 parts of sucrose ester prepared in the step 1, preparing the cellulose into a cellulose solution, adding the sucrose ester to modify the cellulose solution into a modified cellulose solution, and finally coating the modified cellulose solution on a light shielding layer by using a coating roller to generate the fresh-keeping layer, wherein the specific operations are as follows:
step 401: preparing a cellulose solution, placing 100 parts of cellulose prepared in the step 1 into a grinding kettle B, controlling the grinding rate in the grinding kettle B to be 60r/min, and grinding for 44 minutes to obtain cellulose powder with the particle size meeting the requirement; placing cellulose powder with the particle size meeting the specification into a mixing kettle B, adding sufficient deionized water into the mixing kettle B, controlling the temperature in the mixing kettle B to be 30 ℃, and fully mixing for 10 minutes to generate a cellulose solution, wherein the particle size of the ground cellulose powder is controlled to be 0.05 mm;
step 402: preparing a modified cellulose solution, placing the cellulose solution generated in the step 401 in a reaction kettle B, further continuously adding 25 parts of sucrose ester prepared in the step 1 into the reaction kettle B, controlling the temperature in the reaction kettle B to be 20 ℃, and controlling the reaction time to be 30 minutes, so that the solution in the reaction kettle B is colloidal, namely the modified cellulose solution;
step 403: and (3) injecting the modified cellulose solution generated in the step (402) into a coating machine, continuously coating the modified cellulose solution on the surface of the light shielding layer by a coating roller, wherein the thickness of the coated modified cellulose solution is 4.2mm, and enabling the modified cellulose solution coated on the surface of the light shielding layer to be in a jelly state by using a constant-temperature tray, namely a fresh-keeping layer, wherein the thickness of the fresh-keeping layer is controlled to be 3.6 mm.
And 5: compacting, namely placing the semi-finished preservative paper coated with the light shielding layer and the preservative layer at a workbench, and extruding the semi-finished preservative paper at the workbench by a pressure plate with the pressure of 80pa to generate compacted preservative paper, wherein the thickness of the extruded preservative paper is 2.0 mm;
step 6: and (3) coating an antibacterial agent, namely placing the compacted preservative paper prepared in the step (6) into a coating machine, and coating 5 parts of the antibacterial agent prepared in the step (1) on the surface of the preservative layer through a coating roller to generate the finished preservative paper.
Example 2
The embodiment provides a coating process of shading preservative paper, which specifically comprises the following operation steps:
step 1: preparing raw materials, namely 120 parts of cellulose, 25 parts of bamboo charcoal fiber, 30 parts of sucrose ester, 6 parts of antibacterial agent, 4 parts of modifier, 0.8 part of emulsifier, a shading film with the thickness of 0.4mm and 8 parts of adhesive in parts by weight;
step 2: prefabricating a base layer film, treating 25 parts of bamboo charcoal fiber prepared in the step 1, 4 parts of a modifier and 0.8 part of an emulsifier, preparing the bamboo charcoal fiber into a bamboo charcoal fiber solution, then adding the modifier and a softener to modify the bamboo charcoal fiber into a modified mixed solution, and finally evaporating the modified solution on a constant-temperature tray to dryness to generate the base layer film, wherein the specific operation steps are as follows:
step 201: preparing a bamboo charcoal fiber solution, placing 25 parts of the bamboo charcoal fiber prepared in the step 1 into a grinding kettle for grinding, grinding the bamboo charcoal fiber into powder with the fineness of 450 meshes, placing the bamboo charcoal fiber powder inside the grinding kettle into a mixing kettle, adding sufficient deionized water into the mixing kettle, controlling the temperature inside the mixing kettle to be 33 ℃, and fully mixing for 40 minutes to obtain a viscous bamboo charcoal fiber solution;
step 202: preparing a modified mixed solution, placing the bamboo charcoal fiber solution generated in the step 201 in a stirring kettle, continuously adding 0.8 part of emulsifier and 4 parts of modifier into the stirring kettle, controlling the temperature in the stirring kettle to be 25 ℃, controlling the stirring speed to be 350r/min, and stirring for 40 minutes in a counterclockwise manner to enable the mixture in the stirring kettle to have granular texture, so as to generate the modified mixed solution;
step 203: and (3) prefabricating a base layer film, uniformly coating the modified mixed solution prepared in the step (202) on a constant-temperature tray, after coating a layer of the modified mixed solution, waiting for the constant-temperature tray to evaporate the solution to dryness to form a layer of colloidal film, namely the base layer film, wherein the temperature of the constant-temperature tray is controlled to be 30 ℃, the thickness of the modified mixed solution coated on the constant-temperature tray every time is set to be 4mm, and the constant-temperature tray is controlled to evaporate to dryness for 4 minutes to obtain the colloidal film with the thickness of 1.5 mm.
And step 3: coating a shading layer, namely placing the base layer film generated in the step 2 into a coating machine, and bonding the shading film prepared in the step 1 and the base layer film generated in the step 2 by using an adhesive to generate a composite film, wherein the specific operation steps are as follows:
step 301: pre-connecting, namely coating an adhesive on one surface of the shading film with the thickness of 0.4mm prepared in the step 1 by using a coating roller, wherein when the adhesive is coated on the shading film in the step 301, the shading film is firstly placed on a coating platform, the shading film is flattened by using the coating roller, then the adhesive is sprayed on the surface of the shading film, and the flattening treatment is carried out by using the coating roller;
step 302: connecting the two films, namely placing the base layer film generated in the step 2 on a coating flat plate of a coating machine, adhering a shading film on one surface of the base layer film, reversely placing the composite film, exposing the other surface of the base layer film, and further adhering the shading film on the other surface of the base layer film, so that the shading films are adhered on the two surfaces of the base layer film;
step 303: preheating, namely integrally heating the human composite membrane generated in the step 302 to 45 ℃ and integrally heating the outer layer to 55 ℃, so that the bonding effect of the composite membrane is improved, and the thickness is reduced.
And 4, step 4: coating a fresh-keeping layer, treating 120 parts of cellulose and 30 parts of sucrose ester prepared in the step 1, preparing the cellulose into a cellulose solution, adding the sucrose ester to modify the cellulose solution into a modified cellulose solution, and finally coating the modified cellulose solution on a light-shielding layer by using a coating roller to generate the fresh-keeping layer, wherein the specific operations are as follows:
step 401: preparing a cellulose solution, placing 120 parts of cellulose prepared in the step 1 into a grinding kettle B, controlling the grinding rate in the grinding kettle B to be 70r/min, and grinding for 45 minutes to obtain cellulose powder with the particle size meeting the requirement; placing cellulose powder with the particle size meeting the specification into a mixing kettle B, adding sufficient deionized water into the mixing kettle B, controlling the temperature in the mixing kettle B to be 33 ℃, and fully mixing for 15 minutes to generate a cellulose solution, wherein the particle size of the ground cellulose powder is controlled to be 0.05 mm;
step 402: preparing a modified cellulose solution, placing the cellulose solution generated in the step 401 in a reaction kettle B, further continuously adding 30 parts of sucrose ester prepared in the step 1 into the reaction kettle B, controlling the temperature in the reaction kettle B to be 22 ℃, and controlling the reaction time to be 35 minutes, so that the solution in the reaction kettle B is colloidal, namely the modified cellulose solution;
step 403: and (3) injecting the modified cellulose solution generated in the step (402) into a coating machine, continuously coating the modified cellulose solution on the surface of the light shielding layer by a coating roller, wherein the thickness of the coated modified cellulose solution is 4.3mm, and enabling the modified cellulose solution coated on the surface of the light shielding layer to be in a jelly state by using a constant-temperature tray, namely a fresh-keeping layer, wherein the thickness of the fresh-keeping layer is controlled to be 3.7 mm.
And 5: compacting, namely placing the semi-finished preservative paper coated with the light shielding layer and the preservative layer at a workbench, and extruding the semi-finished preservative paper at the workbench by a pressing plate under the pressure of 100pa to generate compacted preservative paper, wherein the thickness of the extruded preservative paper is 4.2 mm;
step 6: and (3) coating an antibacterial agent, namely placing the compacted preservative paper prepared in the step (6) into a coating machine, and coating 6 parts of the antibacterial agent prepared in the step (1) on the surface of the preservative layer through a coating roller to generate the finished preservative paper.
Example 3
The embodiment provides a coating process of shading preservative paper, which specifically comprises the following operation steps:
step 1: preparing raw materials, namely 150 parts of cellulose, 30 parts of bamboo charcoal fiber, 35 parts of sucrose ester, 8 parts of antibacterial agent, 5 parts of modifier, 1.0 part of emulsifier, a shading film with the thickness of 0.5mm and 9 parts of adhesive in parts by weight;
step 2: prefabricating a base layer film, treating 30 parts of bamboo charcoal fiber prepared in the step 1, 5 parts of a modifier and 1.0 part of an emulsifier, preparing the bamboo charcoal fiber into a bamboo charcoal fiber solution, then adding the modifier and a softener to modify the bamboo charcoal fiber into a modified mixed solution, and finally evaporating the modified solution on a constant-temperature tray to dryness to generate the base layer film, wherein the specific operation steps are as follows:
step 201: preparing a bamboo charcoal fiber solution, placing 30 parts of the bamboo charcoal fiber prepared in the step 1 into a grinding kettle for grinding, grinding the bamboo charcoal fiber into powder with the fineness of 500 meshes, placing the bamboo charcoal fiber powder inside the grinding kettle into a mixing kettle, adding sufficient deionized water into the mixing kettle, controlling the temperature inside the mixing kettle to be 35 ℃, and fully mixing for 45 minutes to obtain a viscous bamboo charcoal fiber solution;
step 202: preparing a modified mixed solution, placing the bamboo charcoal fiber solution generated in the step 201 in a stirring kettle, continuously adding 1.0 part of emulsifier and 5 parts of modifier into the stirring kettle, controlling the temperature in the stirring kettle to be 25 ℃, controlling the stirring speed to be 400r/min, and stirring for 45 minutes in a counterclockwise manner to enable the mixture in the stirring kettle to have granular texture, so as to generate the modified mixed solution;
step 203: and (3) prefabricating a base layer film, uniformly coating the modified mixed solution prepared in the step (202) on a constant-temperature tray, after coating a layer of the modified mixed solution, waiting for the constant-temperature tray to evaporate the solution to dryness to form a layer of colloidal film, namely the base layer film, wherein the temperature of the constant-temperature tray is controlled to be 35 ℃, the thickness of the modified mixed solution coated on the constant-temperature tray every time is set to be 5mm, and the constant-temperature tray is controlled to evaporate to dryness for 5 minutes to obtain the colloidal film with the thickness of 2 mm.
And step 3: coating a shading layer, namely placing the base layer film generated in the step 2 into a coating machine, and bonding the shading film prepared in the step 1 and the base layer film generated in the step 2 by using an adhesive to generate a composite film, wherein the specific operation steps are as follows:
step 301: pre-connecting, namely coating an adhesive on one surface of the shading film with the thickness of 0.5mm prepared in the step 1 by using a coating roller, wherein when the adhesive is coated on the shading film in the step 301, the shading film is firstly placed on a coating platform, the shading film is flattened by using the coating roller, then the adhesive is sprayed on the surface of the shading film, and the flattening treatment is carried out by using the coating roller;
step 302: double-film connection, namely placing the base layer thin film generated in the step 2 on a coating flat plate of a coating machine, and coating the shading film coated with the adhesive in the step 301 on the surface of the base layer thin film by using a coating roller to generate a composite film adhered with the shading film;
step 303: preheating, namely integrally heating the human composite membrane generated in the step 302 to 50 ℃, and integrally heating the outer layer to 60 ℃, so that the bonding effect of the composite membrane is improved, and the thickness is reduced.
And 4, step 4: coating a fresh-keeping layer, treating 150 parts of cellulose and 35 parts of sucrose ester prepared in the step 1, preparing the cellulose into a cellulose solution, adding the sucrose ester to modify the cellulose solution into a modified cellulose solution, and finally coating the modified cellulose solution on a light-shielding layer by using a coating roller to generate the fresh-keeping layer, wherein the specific operations are as follows:
step 401: preparing a cellulose solution, placing 150 parts of cellulose prepared in the step 1 into a grinding kettle B, controlling the grinding rate in the grinding kettle B to be 75r/min, and grinding for 46 minutes to obtain cellulose powder with the grain diameter meeting the requirement; placing cellulose powder with the particle size meeting the specification into a mixing kettle B, adding sufficient deionized water into the mixing kettle B, controlling the temperature in the mixing kettle B to be 35 ℃, and fully mixing for 20 minutes to generate a cellulose solution, wherein the particle size of the ground cellulose powder is controlled to be 0.06 mm;
step 402: preparing a modified cellulose solution, placing the cellulose solution generated in the step 401 in a reaction kettle B, further continuously adding 35 parts of sucrose ester prepared in the step 1 into the reaction kettle B, controlling the temperature in the reaction kettle B to be 25 ℃, and controlling the reaction time to be 40 minutes, so that the solution in the reaction kettle B is colloidal, namely the modified cellulose solution;
step 403: and (3) injecting the modified cellulose solution generated in the step (402) into a coating machine, continuously coating the modified cellulose solution on the surface of the light shielding layer by a coating roller, wherein the thickness of the coated modified cellulose solution is 4.4mm, and enabling the modified cellulose solution coated on the surface of the light shielding layer to be in a jelly state by using a constant-temperature tray, namely a fresh-keeping layer, wherein the thickness of the fresh-keeping layer is controlled to be 3.8 mm.
And 5: compacting, namely placing the semi-finished preservative paper coated with the light shielding layer and the preservative layer at a workbench, and extruding the semi-finished preservative paper at the workbench by a pressing plate under the pressure of 120pa to generate compacted preservative paper, wherein the thickness of the extruded preservative paper is 2.2 mm;
step 6: and (3) coating an antibacterial agent, namely placing the compacted preservative paper prepared in the step (6) into a coating machine, and coating 8 parts of the antibacterial agent prepared in the step (1) on the surface of the preservative layer through a coating roller to generate the finished preservative paper.
Comparative example 1
The embodiment provides a coating process of shading preservative paper, which is different from the embodiment 2 in that: the constant temperature tray is replaced by a metal tray, and the metal silver tray is not in a heating constant temperature state in the coating process.
The light-shielding fresh-keeping paper prepared by the coating process of the above examples 1 to 3 and the light-shielding fresh-keeping paper generated by the coating process of the comparative example 1 were respectively subjected to a functional test, and the following data were obtained:
Figure BDA0003637619560000121
as can be seen from the above table, the raw material mixing ratio in example 2 is moderate, the shading preservative paper produced by the coating process in example 2 has the strongest water resistance and higher hardness, the preservative paper has higher light transmittance in the use process, the bamboo charcoal fiber is used as a base material, the moisture absorption and ventilation characteristics are ensured by the micropores of the bamboo charcoal fiber, the shading effect of the preservative paper is realized by the shading layer, and the food is preserved by the preservative layer formed by the modified limiting solution on the shading layer;
when the coating is carried out, the bamboo carbon fiber film is used as a framework, the two sides of the framework of the base layer film are bonded with the shading films through the adhesive to form a sandwich type composite film, the surface of the shading layer is coated with the modified cellulose solution, the modified cellulose solution is enabled to generate a colloidal preservative layer, a composite structure which takes the base layer film as the framework and extends towards the two sides of the framework is formed, and the shading layer and the preservative layer are sequentially coated on the two sides in the same coating mode, so that a five-layer composite preservative paper laminated structure is formed, and the preservation effect of the whole preservative paper is further improved on the basis of ensuring shading preservation.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. A coating process of shading preservative paper is characterized in that: the method specifically comprises the following operation steps:
step 1: preparing raw materials, namely 100-150 parts of cellulose, 20-30 parts of bamboo charcoal fiber, 25-35 parts of sucrose ester, 5-8 parts of antibacterial agent, 3-5 parts of modifier, 0.5-1.0 part of emulsifier, 0.3-0.5mm thick light shielding film and 6-9 parts of adhesive by weight;
step 2: prefabricating a base layer film, treating 20-30 parts of bamboo charcoal fiber prepared in the step 1, 3-5 parts of a modifier and 0.5-1.0 part of an emulsifier, preparing the bamboo charcoal fiber into a bamboo charcoal fiber solution, adding the modifier and a softener to modify the bamboo charcoal fiber into a modified mixed solution, and finally evaporating the modified solution on a constant-temperature tray to dryness to generate the base layer film;
and step 3: coating a shading layer, namely placing the base layer film generated in the step 2 into a coating machine, and bonding the shading film prepared in the step 1 and the base layer film generated in the step 2 by using an adhesive to generate a composite film;
and 4, step 4: coating a fresh-keeping layer, treating the 100-150 parts of cellulose prepared in the step 1 and 25-35 parts of sucrose ester, preparing the cellulose into a cellulose solution, adding the sucrose ester to modify the cellulose solution into a modified cellulose solution, and finally coating the modified cellulose solution on a light shielding layer by using a coating roller to generate the fresh-keeping layer;
and 5: compacting, namely placing the semi-finished preservative paper coated with the light shielding layer and the preservative layer at a workbench, and extruding the semi-finished preservative paper at the workbench by a pressure plate with the pressure of 80-120 pa to generate compacted preservative paper;
step 6: and (3) coating an antibacterial agent, namely placing the compacted preservative paper prepared in the step (6) into a coating machine, and coating 5-8 parts of the antibacterial agent prepared in the step (1) on the surface of the preservative layer through a coating roller to generate the finished preservative paper.
2. The coating process of the shading preservative paper according to claim 1, characterized in that: the specific operation steps for preparing the base paper layer in the step 2 are as follows:
step 201: preparing a bamboo charcoal fiber solution, placing 20-30 parts of the bamboo charcoal fiber prepared in the step 1 into a grinding kettle for grinding, grinding the bamboo charcoal fiber into powder with the fineness of 400-plus 500 meshes, placing the bamboo charcoal fiber powder inside the grinding kettle into a mixing kettle, adding sufficient deionized water into the mixing kettle, controlling the temperature in the mixing kettle to be 30-35 ℃, and fully mixing for 35-45 minutes to obtain a viscous bamboo charcoal fiber solution;
step 202: preparing a modified mixed solution, placing the bamboo charcoal fiber solution generated in the step 201 in a stirring kettle, continuously adding 0.5-1.0 part of emulsifier and 3-5 parts of modifier into the stirring kettle, controlling the temperature in the stirring kettle to be 25 ℃, controlling the stirring speed to be 300-400r/min, and stirring for 35-45 minutes in a counterclockwise manner so that the mixture in the stirring kettle has granular texture to generate the modified mixed solution;
step 203: and (3) prefabricating a base layer film, uniformly coating the modified mixed solution prepared in the step (202) on a constant-temperature tray, and after a layer of the modified mixed solution is coated, waiting for the constant-temperature tray to evaporate the solution to dryness to form a layer of colloidal film, namely the base layer film.
3. The coating process of the shading preservative paper according to claim 2, characterized in that: and in the step 203, the temperature of the constant-temperature tray is controlled to be 25-35 ℃, the thickness of the modified mixed solution on the constant-temperature tray is set to be 3-5mm each time, and the constant-temperature tray is controlled to be evaporated for 3-5 minutes to obtain a colloidal film with the thickness of 1-2 mm.
4. The coating process of the shading preservative paper according to claim 1, which is characterized in that: the step 3 specifically comprises the following steps:
step 301: pre-connecting, namely coating an adhesive on one surface of the shading film with the thickness of 0.3-0.5mm prepared in the step 1 by using a coating roller;
step 302: double-film connection, namely placing the base layer thin film generated in the step 2 on a coating flat plate of a coating machine, and coating the shading film coated with the adhesive in the step 301 on at least one surface of the base layer thin film by using a coating roller to generate a composite film adhered with the shading film;
step 303: preheating, namely integrally heating the human composite membrane generated in the step 302 to 40-50 ℃, and integrally heating the outer layer to 50-60 ℃, so that the bonding effect of the composite membrane is improved, and the thickness is reduced.
5. The coating process of the shading preservative paper according to claim 4, characterized in that: in the step 301, when an adhesive is applied to the light shielding film, the light shielding film is first placed on a coating platform, the light shielding film is flattened by a coating roller, and then the adhesive is sprayed on the surface of the light shielding film and flattened by the coating roller.
6. The coating process of the shading preservative paper according to claim 4, characterized in that: the operation of the step 302 when the light shielding film is adhered to both sides of the base film is as follows: the method comprises the steps of adhering a shading film on one surface of a base layer film, reversely arranging a composite film, exposing the other surface of the base layer film, and further adhering the shading film on the other surface, so that the shading films are adhered on the two surfaces of the base layer film.
7. The coating process method of the shading preservative paper according to claim 1, which is characterized in that: the step 4 specifically comprises the following steps:
step 401: preparing a cellulose solution, placing 150 parts of 100-one cellulose prepared in the step 1 in a grinding kettle B, controlling the grinding rate in the grinding kettle B to be 60-75r/min, and grinding for 44-46 minutes to obtain cellulose powder with the particle size meeting the requirement; placing cellulose powder with the particle size meeting the specification into a mixing kettle B, adding sufficient deionized water into the mixing kettle B, controlling the temperature in the mixing kettle B to be 30-35 ℃, and fully mixing for 10-20 minutes to generate a cellulose solution;
step 402: preparing a modified cellulose solution, placing the cellulose solution generated in the step 401 in a reaction kettle B, further continuously adding 25-35 parts of sucrose ester prepared in the step 1 into the reaction kettle B, controlling the temperature in the reaction kettle B to be 20-25 ℃, and controlling the reaction time to be 30-40 minutes, so that the solution in the reaction kettle B is colloidal, namely the modified cellulose solution;
step 403: and (3) injecting the modified cellulose solution generated in the step (402) into a coating machine, continuously coating the modified cellulose solution on the surface of the light shielding layer by a coating roller, wherein the thickness of the coated modified cellulose solution is 4.2-4.4mm, and enabling the modified cellulose solution coated on the surface of the light shielding layer to be in a jelly state by using a constant-temperature tray, namely, the fresh-keeping layer.
8. The coating process method of the shading preservative paper according to claim 7, which is characterized in that: the grain diameter of the cellulose powder ground in the step 401 is controlled to be 0.05-0.06mm, and the thickness of the fresh-keeping layer in the step 403 is controlled to be 3.6-3.8 mm.
9. The coating process method of the shading preservative paper according to claim 1, which is characterized in that: the coating rolls used in the steps 2 to 4 are the same coating roll.
10. The coating process method of the shading preservative paper according to claim 1, which is characterized in that: the thickness of the preservative paper extruded in the step 5 is 2.0-2.2 mm.
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