7873 results about "Food packaging" patented technology

The invention discloses a food package fault monitoring method and system, and particularly relates to the field of food package fault monitoring, and the method comprises the steps: extracting a structure response variable of a food package object in an operation environment, constructing a disturbance expression sequence, and taking the disturbance expression sequence as a basis for path evolution recognition and industrial data processing analysis in the food package fault monitoring method; the method comprises the following steps: constructing a structure coupling mapping graph by analyzing a physical dependency relationship between food packaging structure arrangement and adjacent units; the change trend of a path disturbance parameter sequence formed by disturbance parameters corresponding to all paths in a structural path set is analyzed. By constructing a multi-level identification mechanism based on a structure disturbance expression sequence and a path propagation chain, industrial data capture and closed-loop traceability of a hidden defect propagation trend in a structure interdependence relationship between food packaging units are realized, so that the problem that the overall structure instability of a cluster type package cannot be identified in time is solved.

The invention discloses a method for preparing a modified PHA composite material by using a twin-screw extruder and application of the modified PHA composite material. The method comprises the following steps: carrying out in-situ melt blending on polyhydroxyalkanoate (PHA), poly (butylene adipate terephthalate)-poly (butylene adipate terephthalate) (PBAT), polyvinyl alcohol (PVOH) and chain extenders in a twin-screw extruder, so that the chain extenders such as polyfunctional group epoxy or isocyanate react with molecular terminal groups of the PHA, the PBAT and the PVOH to form a partially crosslinked or grafted structure; therefore, the compatibility is enhanced, the thermal stability is improved, and the barrier property is remarkably improved. Experiments prove that the obtained modified PHA composite material has the characteristics of high strength, high elongation, excellent water and oxygen resistance and biodegradability, and meets the strict requirements of multiple fields such as food packaging, agricultural plastic mulching films, medical consumables and the like on mechanical properties and barrier properties. The preparation method is simple, convenient and efficient, and large-scale continuous production can be achieved on existing double-screw extrusion equipment.

The invention relates to the technical field of film packaging, in particular to a PA-EVOH multi-layer co-extrusion film, a preparation method thereof and a composite film. The PA-EVOH multi-layer co-extrusion film comprises a first functional surface layer, a first secondary surface layer, a core layer, a second secondary surface layer and a second functional surface layer, the thickness of the core layer is 13%-40% of the total thickness of the film layer, the melting point of the adopted PA resin is 215-225 DEG C, the melting point of the EVOH resin is 164-183 DEG C, and the ethylene content is 32-44 mol%. The PA-EVOH multi-layer co-extrusion film and the composite film thereof have high barrier property and thermal stability, and good transparency and apparent quality, and can be used for pasteurization or poaching sterilization food packaging. The invention further provides a preparation method which is used for manufacturing the PA-EVOH multi-layer co-extrusion film, the film layer structure and the film layer thickness proportion are optimized, and better physical comprehensive performance and processing performance are achieved.

The invention discloses a high-barrier-property biodegradable food packaging film and a preparation method thereof, and relates to the technical field of food packaging. Comprising the following main components in parts by weight: 4-25 parts of a polymeric hybrid, 6-15 parts of an enzymatic degradation enhancer, 10-25 parts of a barrier material, 55-80 parts of a bio-based polymer, 30-40 parts of an intelligent degradation regulator, an intelligent responsive material, 10-15 parts of a novel starch derivative, 13-27 parts of novel polyester bio-ester and 20-40 parts of a chitosan-sodium alginate compound. Through the modified graphene, the high-barrier and high-wear-resistant biodegradation function is realized, the problems of food oxidation, dampness and deterioration caused by gases such as oxygen, water vapor and carbon dioxide are solved, and the shortening of the shelf life of food and the accumulation of wastes are avoided.

The invention discloses reactive compatible ACR-PHA core-shell latex and application thereof, and belongs to the field of polymer chemistry and material science. The latex comprises composite particles with core-shell, gradient core-shell, raspberry-shaped or Janus heterostructure, interfaces of ACR phase and PHA phase of the latex are connected through covalent bonds, and the compatibility problem of physical blending is fundamentally solved. The latex particles have a Z-average particle size of 80-400 nm, a PDI of less than or equal to 0.30, and a minimum film formation temperature (MFFT) of-10 to 12 DEG C. The coating prepared by the invention has excellent high-humidity barrier stability (WVTR is less than or equal to 65g / m.d), low-temperature rapid heat sealability, water resistance, oil resistance and complete recoverability, does not contain PFAS, is an ideal alternative scheme of a traditional PE (Polyethylene) spraying film, and is suitable for the fields of food packaging paper, paper cups, bowls and the like.

The invention relates to the technical field of food packaging materials, and discloses a high-barrier recyclable eleven-layer co-extrusion film for food packaging and a preparation process thereof, and the preparation process comprises the following steps: preparing a compound which contains a hindered phenol group and a cinnamate group and has a compatible function; the preparation method comprises the following steps: compounding a compound which contains a hindered phenol group and a cinnamate group and has a compatible function with maleic anhydride grafted polyethylene resin PE-g-MAH to prepare a compatible component; the high-barrier recyclable eleven-layer co-extrusion film for food packaging is prepared by taking PA6, BVOH and PE as raw materials, improving the compatibility of BVOH and PE by utilizing compatible components, carrying out hydrolysis reaction on water-soluble BVOH to realize interlayer separation of PE and PA and adopting an eleven-layer co-extrusion blow molding film forming process. And the sanitary performance meets the national standard requirement, and the product is easy to recycle and conforms to the environment-friendly trend.

The invention relates to the technical field of plastics, in particular to an antibacterial food packaging bag and a preparation method thereof.The antibacterial food packaging bag is prepared by blending polylactic acid and polypropylene carbonate as a base film raw material, selecting a food-grade ADR chain extender as a chain extender, selecting one of butyl titanate and a titanate coupling agent as a compatibilizer and selecting composite hybrid cellulose as a broad-spectrum antibacterial agent; carrying out extrusion granulation and blow molding to obtain a base film; the preparation method comprises the following steps: taking microcrystalline cellulose-nano zinc oxide hybrid particles as hybrid cellulose, performing epoxidation on the hybrid cellulose by using epoxy chloropropane, and then grafting an amino acid-based Schiff base antibacterial agent by using epoxy-hydroxyl reaction; composite hybrid cellulose and modified castor oil-based waterborne polyurethane are used for preparing a protective coating, the surface of a base membrane is coated with the protective coating, and a green, environment-friendly, durable, antibacterial, hydrophobic and antifouling self-repairing surface is constructed.

The invention relates to the technical field of packaging materials, and discloses an antibacterial functional food packaging film and a preparation method thereof.The packaging film is formed by taking low-density polyethylene as a main raw material, adding a compatilizer, a synergistic antibacterial agent, a fiber coating material and the like and carrying out blending, extrusion and film blowing processes. The synergistic antibacterial component is nano-zinc oxide with the surface grafted with biomass antibacterial agent tannic acid, after being immobilized on the surface of the nano-zinc oxide, the tannic acid cannot be easily volatilized and migrated, the broad-spectrum antibacterial performance of the tannic acid is continuously exerted, and the tannic acid and the photocatalytic antibacterial effect of the nano-zinc oxide are mutually cooperated, so that the synergistic antibacterial effect is achieved. Due to the addition of the fiber coating material, the density of the polyethylene film can be improved, and the air tightness and the high-temperature-resistant effect can be improved. In addition, the fiber coating material can exert stress load transfer and absorption effects, so that the prepared polyethylene film has excellent mechanical strength.

A packaged food product includes a food product in packaging formed from a polyethylene film laminate body having a main polyethylene (PE) film layer and an ethylene vinyl alcohol (EVOH) layer. The packaging is laser date coded, with the laser date coding being established in the EVOH layer. Of the overall packaging, the ethylene vinyl alcohol layer is quite thin, generally having a thickness which is no greater than 5% of a thickness of the food packaging. The entire food packaging is readily recyclable, particularly by being at least essentially void of any polypropylene polymers and polyethylene terephthalate. The EVOH layer can be the outermost layer of the packaging, such as with the packaging being limited to just the PE and EVOH layers, or the packaging can include one or more other layers, such as cold seal, tie and / or ink layers.

The invention discloses a PHA nano aqueous suspension as well as a preparation method and application thereof, and belongs to the field of high polymer materials and processing and application thereof. The suspension takes PHA resin as a dispersion phase and water as a continuous phase, the total solid content is 23-65wt%, the PHA resin accounts for 80-98.5 wt% of the total solid, and the assistant accounts for 1.5-20wt% of the total solid. The average particle size of PHA particles is 30-140 nm, D90 is smaller than or equal to 150 nm, the polydispersity index PDI is smaller than 0.3, and when the pH is 6.5-7.5, the absolute value of Zeta potential is larger than 30 mV. The preparation method comprises the following steps: pretreating the PHA raw material, preliminarily dispersing in a water phase under the action of the dispersion stabilizing aid, and carrying out high-energy homogenization treatment. The obtained suspension is stable in storage, has excellent barrier property and mechanical property after film formation, and is suitable for preparing biodegradable food packaging barrier coatings, water-based environment-friendly coatings and water-based adhesives.

The invention belongs to the technical field of high polymer materials, and discloses a modified bamboo fiber full-biodegradable material, with PBAT, PLA, modified bamboo powder, a plasticizer and a composite antibacterial agent as raw materials, the preparation method comprises the following steps: S1, carrying out alkali treatment modification and silane coupling agent modification on bamboo powder; s2, preparing a composite antibacterial agent by adopting a solid-phase reaction method; s3, all the components with the set amount are fully stirred; s4, carrying out high-temperature melt extrusion on the mixed component raw materials, cooling and pelletizing; s5, the particles are subjected to high-temperature tape casting, and sheets are obtained; and S6, the sheet is formed through plastic uptake. According to the modified bamboo fiber full-biodegradable material disclosed by the invention, due to the addition of the modified bamboo powder, not only can the mechanical properties of food packages be effectively improved, but also the production cost of degradable food packages can be reduced, and the degradation rate of the food packages can be increased; the compound antibacterial agent is added, so that the food package is endowed with excellent antibacterial performance, and the metabolic process of the litchis is delayed, so that the weight loss rate and the rotting rate of the litchis during storage are remarkably reduced, the shelf life of the litchis can be effectively prolonged, and meanwhile, the preservative can be applied to fresh-keeping storage of other fruits and has wide applicability.

The invention provides a gamma-cyclodextrin-based metal organic framework composite material as well as preparation and application thereof. The metal organic framework composite material based on gamma-cyclodextrin comprises chitosan, gamma-CD-MOFs (Metal Organic Frameworks) and an active substance. The preparation method comprises the following steps: by taking chitosan as a film material base material, synthesizing gamma-CD-MOFs by utilizing a hydrothermal method, and then loading cinnamyl aldehyde with antibacterial property, 2-methoxycinnamyl aldehyde with ultraviolet light resistance and curcumin with an antioxidant effect into the gamma-CD-MOFs. And finally, mixing with chitosan with better film-forming property, and spraying on glass or the surfaces of fresh fruits. The gamma-CD-MOFs has the characteristic of slowly releasing bioactive substances, is non-toxic and is a material capable of being applied to food packaging.

The invention discloses a low-illumination food package image recognition method, a computer program product and a terminal, and belongs to the technical field of image recognition. The joint training loss is the weighted sum of the reconstruction loss of the low-illumination image enhancement network, the first feature perception loss of the optical character recognition model, the classification loss of the optical character recognition model and the label loss of the optical character recognition model. According to the method, a joint training strategy is adopted, under the guidance of advanced information fed back by the optical character recognition model, the low-illumination image enhancement network can better understand and predict the features of the image under the low-illumination condition, and then optimization is continuously carried out to generate the high-illumination image more suitable for processing of the optical character recognition model; the method not only improves the precision of a low-illumination image optical character recognition task, but also enhances the robustness and generalization ability of an optical character recognition model under different illumination conditions.

The invention relates to the field of production line efficiency management, and provides a food packaging workshop production line efficiency management system, which is characterized in that a data acquisition module acquires workshop production line historical environment temperature and humidity data and packaging material performance parameter data, and a material analysis module establishes performance models of different packaging materials under various temperature and humidity combinations; the production initialization module configures environmental parameters of an initial food packaging workshop production line according to the material analysis module, and the quality tracing module traces specific links of food packaging problems; the comprehensive efficiency management module carries out efficiency management including personnel and resources according to an analysis result of the material analysis module, and carries out process efficiency management based on a tracing result of the quality tracing module; according to the method, the influence weight and rule of the temperature and humidity on the material performance are determined, personnel task allocation, resource management and environmental parameter adjustment are carried out according to the analysis result, and the production efficiency is improved.

The utility model discloses sealing equipment for a food packaging bag, belongs to the technical field of food packaging bags, and is used for solving the problems that in the pre-packaged food sealing process, bag opening, material loading and then sealing need to be assisted by multiple persons, time and labor are wasted, and efficiency is low. Comprising a conveying mechanism and a packaging mechanism. After the food packaging bag is conveyed to a material storage tank and material loading is completed, the food packaging bag can be continuously driven to move towards the sealing assemblies, when the food packaging bag is located between the two sealing assemblies, two second servo electric cylinders can drive the two sealing assemblies to seal an opening of the food packaging bag, and after sealing is completed, the food packaging bag is driven to move towards the sealing assemblies. The adsorption assembly drives the sealed food packaging bags to be conveyed to the conveying device under the action of the electric sliding block and the electric sliding rail to be conveyed and packaged, through the mode, conveying, bag opening, discharging, packaging and conveying are integrated, output of manual labor is greatly reduced, and the working efficiency is improved.

The present invention falls within the technical field of Food Packaging and was developed specifically to meet the needs of the Enteral Nutrition market. This innovation proposes a unique packaging solution, compatible with both Closed Enteral Systems and Open Enteral Systems. It is defined as an integrated opening device in the aseptic carton packaging, which allows direct connection to the enteral feeding set without the need for external devices (such as adapters and connectors). Thus, the invention transforms the conventional use of aseptic carton packaging—previously limited to open enteral systems—into a versatile, multi-use solution. Featuring characteristics equivalent to those of specialized packages for closed systems available in the market, this device, when incorporated into aseptic carton packaging, enables the contained product to be administered in both closed and open enteral systems. This is made possible by its features that allow direct connection to the enteral feeding set while provide the essential functionalities of traditional aseptic carton packaging, such as the rupture of the internal protective seal, which occurs when unscrewing the cap.

A food package air leakage detection device provided by the present invention comprises a rack, a first conveying device and a second conveying device are symmetrically arranged along the width direction of the rack, the surface of the first conveying device is provided with a fixedly connected detection device, the detection device is provided with a detection box, and the detection box is provided with a fixedly connected extrusion device. A rotating device connected with the rack is arranged between the first conveying device and the second conveying device, the rotating device is provided with a mounting plate, a lifting clamping device is arranged below the mounting plate, and the lifting clamping device comprises a fixing plate, a lifting component and a plurality of clamping components; the detection box in the detection device is provided with a plurality of placement grooves, each placement groove corresponds to one package, the extrusion device extrudes the packages through the extrusion air bag, simultaneous detection of the multiple packages is achieved, and the detection accuracy is improved through sealing and covering of a sealing rubber plate and the detection box and measurement of an air pressure sensor. Whether the package leaks air or not can be accurately judged, so that the detection accuracy and the working efficiency are improved.

The present invention relates to a food packaging device, and particularly to a rotary vacuum pumping device for a food packaging device. The present invention provides the following technical solutions: A rotary vacuum pumping device for a food packaging device includes a turntable and a vacuum pumping assembly. The vacuum pumping assembly includes a base and a cover body. An opening and closing cover driving mechanism is provided between the turntable and the vacuum pumping assembly. A support frame is provided on the turntable. The cover body is connected to the support frame through a support arm. A closing position tension adjusting member is provided between the support frame and the cover body; the base is hingedly connected to the turntable through a hinge block. The base has a linkage station. The support arm and the linkage station of the base are linked through a connecting rod. One end of the connecting rod extends between the two hinge points of the support arm and is hingedly connected to the support arm, and the other end is at the linkage station and is hingedly connected to the linkage station. By adopting the above technical solutions, a rotary vacuum pumping device for a food packaging device with energy saving, shortened vacuum pumping time, and simple structure is provided.

The invention relates to the technical field of product data management, in particular to a food package printing material batch traceable management method and system, and the method comprises the following steps: collecting the production time of each production batch, constructing time data which comprises year, month, day, hour, minute and second, and creating a time code based on the time data; the time code is combined with the data of the production batch. According to the method, the time data of each production batch, which is accurate to second, is collected, the unique time code is constructed, and the time code and the batch production data are closely combined, so that a traceable time stamp data packet is formed, accurate correspondence between production information and time is ensured, and more efficient information integration and storage management are realized. In the storage process, classification and indexing are carried out in combination with batch time marking data packets, a data retrieval mechanism capable of rapidly responding is established, the information positioning speed and accuracy are improved, and the efficiency and reliability of batch query and tracking are improved.

The invention discloses a light-weight manufacturing method and system for a PET bottle for food packaging, particularly relates to the technical field of PET bottle blank manufacturing, and aims to solve the problem that the subsequent blow molding quality is affected due to the fact that complex internal stress is generated in a bottle blank due to a rapid cooling process after injection molding in the prior art. Image information and temperature distribution data of a bottle blank after injection molding are obtained, geometric features and cooling rate differences are analyzed and recognized based on multi-physics coupling, a stress cause weight evaluation model is established to generate a stress distribution map, and then structural entropy increase factors under different temperature adjustment paths are simulated and calculated according to thermodynamic parameters, so that the temperature adjustment precision is improved. And carrying out partitioned temperature adjustment treatment on the bottle blank, and finally, carrying out constant-temperature and constant-humidity standing to sufficiently relax the stress. The internal stress distribution of the bottle blank can be effectively controlled, and the wall thickness uniformity and the mechanical property consistency of the light-weight PET bottle are improved.

The invention provides a packaging device for oil-immersed food and a using method of the packaging device, relates to a food packaging technology, and particularly discloses a machine shell, a charging barrel and a machine frame. The machine frame is installed in the machine shell, the charging barrel is installed at the top of the machine frame, and two second driving rollers are installed at the top of the machine frame and located on the two sides of the charging barrel correspondingly; each second driving roller is provided with a coiled material belt; a bag making mechanism opposite to an output port of the charging barrel is mounted in the middle of the rack; a guide structure matched with the two material belts is arranged in the bag making mechanism; an edge sealing mechanism for sealing the two sides of the two material belts is arranged in the guide structure; a position adjusting structure enabling the upper ends of the two material belts to form an inlet and outlet is arranged in the guiding structure. The bottom of the bag making mechanism is provided with a traction mechanism used for pulling a material belt to move downwards in the vertical direction. The use of a material belt is accurately controlled through the bag making mechanism, so that the waste of materials is reduced; the position adjusting structure enables the charging barrel conveying pipeline not to make direct contact with the inner wall of the packaging bag, and the risk of cross contamination is avoided.

The invention discloses a laminating device for food packaging bag production, and relates to the technical field of laminating devices.The laminating device comprises an outer frame, the outer surface of the outer frame is fixedly connected with a first motor, the output end of the first motor penetrates through the outer frame and extends to the inner side, and the output end of the first motor is fixedly connected with a driving roller; according to the film laminating device for food packaging bag production, after a packaging bag subjected to film laminating processing is sent out, the packaging bag continues to be put in, a first motor is started for conveying and feeding, then a second motor is started to operate, after the second motor operates, a second rotating shaft can be driven to rotate along with the second motor, and a winding roller can be driven to rotate along with the second rotating shaft; the winding roller rotates to wind the film, so that a new film is located above a packaging bag to wait for laminating, cutting and laminating, the purpose of automatically finishing laminating operation is achieved, the manual operation step is omitted, and the processing efficiency is effectively improved.

A dispersion coated paperboard (1) for food packaging applications, the coated paperboard comprising a paper or paperboard substrate (2) having a first side (2a) and a second side (2b). The paper coated paperboard (1) further comprises a first layer (3) coated with a PHA dispersion, the first layer (3) being coated on at least one side (2a, 2b) of the paperboard substrate (2); and a second layer (4) coated with a PHA dispersion, said second layer (4) being coated on at least one of said first layers (3) wherein the crystallinity of the second layer (4) is higher than the crystallinity of the first layer (3).

The invention discloses a low-illumination food package image enhancement and recognition method, system and terminal, and belongs to the technical field of image enhancement, and the method comprises the steps: building a low-illumination image enhancement network which comprises a down-sampling module, an up-sampling module and a reconstruction module; training the low-illumination image enhancement network, and optimizing parameters of the low-illumination image enhancement network; and performing enhancement processing on the low-illumination image by using the trained low-illumination image enhancement network to obtain a high-illumination image. Multi-scale feature extraction and fusion are performed through the down-sampling module and the up-sampling module, so that local details and global structure information in an image can be effectively captured, and the image quality is improved; the useful features of the image are enhanced through feature enhancement processing, and the reconstruction process of the image is optimized, so that the enhanced high-illumination image is clearer and brighter, and the details are richer.

The invention discloses a degradable PHA / PU composite water-based barrier coating and a coated paper product, and belongs to the field of biodegradable polymer coatings. The coating composition comprises a high proportion of polyhydroxyalkanoates as a barrier phase and a bio-based polyurethane as a toughening and heat sealing phase. The key innovation lies in that the cooperation of rigid barrier and flexible functions is realized by accurately regulating and controlling the ratio of two phases and adopting bio-based crosslinking, and the problem that the barrier property, the heat sealability and the flexibility of a traditional single material are difficult to consider at the same time is solved under the condition of low coating amount. The invention provides a full-life-cycle green packaging solution, aims to replace a polyethylene spraying film and a fluorine-containing coating, and has a remarkable application value in the field of food packaging.

The invention discloses a multilayer co-extrusion heat-shrinkable film and a preparation method thereof, the film comprises an outer wear-resistant layer, a middle support layer and an inner functional layer, the thickness ratio of each layer is 1: 3: 1-1: 5: 1, the total thickness is 50-150 [mu] m, and the raw materials are prepared according to respective formulas. The preparation method comprises the steps of raw material preparation, melt mixing, die head extrusion, two-way stretching, water-cooling shaping, electronic crosslinking, aging treatment, heating softening and cold and hot shaping. The carbon nanotubes (CNT) and the h-BN nanosheets synergistically hinder crack propagation in the middle layer, so that the crack propagation resistance of the film is remarkably improved, the tensile strength, the thermal shrinkage rate and other properties are also optimized, compared with a traditional film, the comprehensive properties of wear resistance, high strength and high thermal shrinkage rate are achieved through interface collaborative design, meanwhile, the production cost is reduced by 20-30%, and the application prospect is wide. The method is suitable for food packaging, electronic device protection and other fields.

The invention discloses a bio-based PHA oil-resistant and moisture-permeable coating for hamburger paper, coated paper and a preparation method, and belongs to the technical field of bio-based high polymer materials and paper-based food packaging. The coating is a PHA aqueous dispersion, and mainly comprises a semi-crystalline matrix PHA and a low-crystallinity or amorphous toughening PHA. The core of the coating is that after the coating is dried to form a film, a functional gradient structure can be spontaneously formed in the thickness direction of the coating: an interface layer close to a paper base is rich in toughening PHA so as to enhance toughness and adhesive force; and the surface layer of the coating is rich in matrix PHA so as to maximize the oil resistance. By means of the functional gradient structural design, the packaging material integrates oil resistance, moisture permeability and flexibility of the packaging material, has the degradable environment-friendly characteristic and is suitable for packaging high-grease food.

The invention discloses a high-barrier coating film for food packaging and a preparation method of the high-barrier coating film, and relates to the field of food packaging materials. Wherein the high-barrier coating film comprises an MDOPE film, a modified PVA coating and an aluminum oxide barrier layer which are arranged in sequence, and before the aluminum oxide barrier layer is deposited on the surface of the modified PVA coating, corona or plasma treatment is firstly carried out on the modified PVA coating; wherein the preparation raw materials of the modified PVA coating comprise water-soluble polyvinyl alcohol, modified graphene oxide and a diluent, and the weight ratio of the water-soluble polyvinyl alcohol to the modified graphene oxide to the diluent is (8.2-9.6): (1-1.5): 100; the modified graphene oxide is obtained by modifying graphene oxide by using a modifying agent comprising water-soluble single-epoxy-group-terminated polyether and an amino silane coupling agent. The coating film has excellent oxygen and water vapor blocking performance, can be suitable for the field of food packaging, and effectively prolongs the storage time of food.

The invention relates to the field of foaming materials, in particular to a low-solvent-residue expandable polystyrene material and a preparation method thereof. The expandable polystyrene material with low solvent residue comprises the following raw materials in percentage by weight: 0.35-0.45% of a free radical initiation system, 0.35-0.45% of S, S, S, S, S, S, S, S, S, S, S, S, S, S, S According to the present invention, the material comprises, by weight, 0.1-0.15% of S, S '-bis (alpha, alpha'-dimethyl-alpha ''-acetoxy) trithiocarbonate, 0.15-0.2% of ascorbic acid, 0.1-0.2% of a nucleating agent, 0.2-0.3% of a suspending agent, 0.001-0.003% of an emulsifier, 5-6% of a foaming agent, 0.15-0.25% of a plasticizer, 0.001-0.002% of hydroxyethyl cellulose, 0.05% of sodium phosphate, 0.1-0.2% of zinc stearate, and 0.1-0.2% of glyceryl stearate, the obtained material has low solvent residue, meets food safety requirements, and is suitable for food packaging.

The application discloses degradable PHA / PU composite water-based barrier coating and coated paper products, and belongs to the field of biodegradable polymer coating. The coating composition contains a high proportion of polyhydroxyalkanoate as a barrier phase and a bio-based polyurethane as a toughening and heat-sealing phase. The key innovation is that by precisely controlling the ratio of the two phases and using bio-based cross-linking, the synergy of rigid barrier and flexible function is achieved, and the problem that the barrier property, heat-sealing property and flexibility of traditional single material are difficult to balance is solved at low coating amount. The application provides a full life cycle green packaging solution, which aims to replace polyethylene shower film and fluorine-containing coating, and has significant application value in the field of food packaging.