4621 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 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 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.

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 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 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.

The invention relates to the technical field of food packaging materials, in particular to a cerium dioxide nano-enzyme modified antibacterial coating and application of the cerium dioxide nano-enzyme modified antibacterial coating in food packaging. The biomimetic mineralization layer comprises the following components in percentage by weight: 35-45% of a green base material, 8-12% of dopamine modified yttrium-doped cerium dioxide nano-enzyme, 4-6% of a composite antibacterial agent, 3-4% of a natural cross-linking agent, 2-3% of a degradable plasticizer, 1-2% of a biomimetic mineralization layer precursor and the balance of deionized water, the green base material is a blend of a chitosan-polyethylene glycol graft and polylactic acid; the doping amount of Y3 in the nano enzyme is 3-4at%. The antibacterial agent is excellent and lasting in antibacterial effect, has no migration risk of the antibacterial agent, and can guarantee food safety; a green base material and a degradable plasticizer are adopted, so that natural degradation is realized, and environmental pollution is avoided; the mechanical property is good, the aging resistance is realized, and the oxygen barrier property is strong; the food packaging box is suitable for various foods, effectively prolongs the shelf life, and meets the requirement of green packaging.

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

The invention discloses a natural eutectic solvent enhanced konjac glucomannan film as well as a preparation method and application thereof, and belongs to the technical field of food packaging. The konjac glucomannan film enhanced by the natural deep eutectic solvent, provided by the invention, comprises konjac glucomannan, the natural deep eutectic solvent and gallic acid modified MXene nanoparticles; the mass ratio of the konjac glucomannan to the natural eutectic solvent to the gallic acid modified MXene nanoparticles is (850 to 950) to (50 to 250) to (10 to 40). Through the synergistic effect of all the components, the defects that KGM is insufficient in intrinsic mechanical strength, weak in antibacterial and antioxidant performance and poor in moisture resistance are overcome, the comprehensive performance of the film is remarkably improved, and the film can be used for cold-chain packaging of high-value fresh food and has environment friendliness and functional practicability.

The invention discloses a composite film based on light-biological synergistic gradient degradation and a preparation method thereof, the composite film sequentially comprises a light response layer, a transition layer and a biological response layer from outside to inside, and the light response layer comprises a polycaprolactone matrix, a tetraphenylporphyrin iron photosensitizer and anatase type TiO2 nanorods; the transition layer is a gradient blend of polylactic acid and modified starch; the biological response layer comprises polyhydroxyalkanoate and bacterial cellulose nanofibers; through the design of the three-layer gradient structure and the construction of the bionic microchannel, the synergistic effect of light degradation, hydrolysis and biodegradation is realized; the composite membrane has excellent mechanical properties and environmental adaptability, the degradation period can be accurately regulated and controlled within 30-180 days, and the soil degradation rate within 60 days reaches 91% or above; the preparation method comprises the processes of electrostatic spinning, gradient co-extrusion and bacterial cellulose in-situ culture. The material can be widely applied to the fields of agricultural mulching films, food packaging and the like, and the problems that a traditional degradable film is poor in mechanical property and uncontrollable in degradation are solved.

The invention discloses a water-based PHA (Polyhydroxyalkanoate) coating and PHA extrusion layer compounded paper-based high-barrier material as well as a preparation method and application thereof, and belongs to the technical field of biodegradable high polymer materials and environment-friendly packaging. According to the scheme, a double-component system with a specific melting point difference is innovatively introduced to construct the water-based pre-coating layer, and efficient sealing and strong anchoring of a rough base material can be achieved under the extremely low coating weight by means of the double mechanisms of'microcosmic leveling and interface thermal fusion '. Compared with a traditional thick-layer lamination process, the material achieves more excellent barrier integrity and oil-resistant and moisture-resistant performance through a thinner extrusion surface layer, the moisture-resistant and oxygen-resistant performance is remarkably improved, and meanwhile the requirement for puncture resistance of dry and hard food packaging materials is thoroughly met through the unique double-layer system stress balance design. The material does not contain fluorine additives, is completely biodegradable, and meets the high-standard requirements of food safety and compliance.

The design consists of a rectangular shape on the left side, excluding the dotted lines; in the center of the drawing, there is an arched window-shaped feature with a curved upper portion; floral patterns are arranged along the border of the arched window, and a cow's face is depicted at the bottom of the drawing; the nutrition facts and full amino acid in the drawing form no part of the claimed design.

The invention provides a synthesis method of bio-based poly (ethylene 2, 5-furandicarboxylate) (poly (ethylene 2, 5-furandicarboxylate) for short) and performance application of the bio-based poly (ethylene 2, 5-furandicarboxylate). According to the method, 2, 5-furandicarboxylic acid (FDCA) derived from renewable resources and ethylene glycol (EG) are used as main raw materials, and the high-molecular-weight PEF is prepared through microwave-assisted esterification-polycondensation reaction under the action of a metal catalyst. The prepared PEF has excellent thermal mechanical property and gas barrier property, the glass transition temperature is about 58.6 DEG C, the melting temperature is about 187.4 DEG C, and the thermal decomposition 18% weight loss temperature exceeds 400 DEG C. The PEF material can be biologically degraded under the industrial composting condition, and the degradation speed is higher compared with that of traditional petroleum-based PET polyester. The PEF provided by the invention is suitable for the fields of food packaging films, beverage bottles and fiber materials, has the advantages of biodegradability, heat resistance stability and high barrier property, can partially replace polyethylene glycol terephthalate (PET) and other petrochemical plastics, and meets the requirements of sustainable development.

The invention relates to the technical field of polymer degradable materials, in particular to a biodegradable material as well as a preparation method and application thereof. The material takes modified polylactic acid as a main body, and an antioxidant, a plasticizer, a flame retardant and an inorganic filler are used as auxiliary materials in parts by weight. The method is characterized in that lactic acid and an epicatechin imidazole ammonium chloride polymer are polymerized under the catalysis of stannous octoate, and an epicatechin bioactive group is introduced into a polylactic acid main chain in a chemical bonding manner, so that the biodegradation rate, the mechanical property and the thermal stability of the material are remarkably improved. Bioactive substances and ionic groups in the material promote microbial degradation, and the material can be completely decomposed in a compost environment in a short time; meanwhile, the strength, the toughness and the high-temperature processability of the polylactic acid are effectively improved through molecular-level enhancement and an ionic cross-linking effect. The material can be widely applied to the fields of disposable tableware, food packaging films, degradable agricultural mulching films and the like.

The invention discloses a high-performance polypropylene material for food packaging and a preparation method thereof, and the high-performance polypropylene material comprises the following raw materials by weight: 80-90 parts of polypropylene, 10-15 parts of POE, 5-8 parts of modified montmorillonite, 4-7 parts of a compatilizer, and 0.3-0.5 part of an auxiliary agent. According to the high-performance polypropylene material for food packaging, the montmorillonite subjected to multi-step modification is introduced into a polypropylene matrix, and meanwhile, the POE elastomer and the compatilizer are added, so that the prepared composite material keeps excellent mechanical toughness and processability, and meanwhile, the barrier property of the composite material to gases such as oxygen and water vapor is remarkably improved; the heat resistance and the ultraviolet aging resistance of the material are also remarkably improved, toxic and harmful solvents or auxiliaries are not introduced into the material, the preparation process is stable and controllable, and the strict requirements for long shelf life, high safety and cost control in the field of high-performance food packaging can be met.

The invention discloses a hanging and conveying device for food packaging, and relates to the technical field of food packaging, the hanging and conveying device comprises a supporting column, a supporting rod is fixedly mounted at the top of the supporting column, an annular sliding rail is fixedly mounted at the bottom of the supporting rod, a fixing frame is fixedly mounted at the top of the annular sliding rail, and a driving assembly is mounted at the bottom of the fixing frame; a connecting rod is fixedly mounted on the outer side of the supporting column, a synchronous assembly is mounted at the top of the connecting rod, a fixing rod is fixedly mounted at the top of the annular sliding rail, and a disinfection assembly is mounted at the bottom of the fixing rod. According to the embodiment, the four first driving motors can drive the annular chain to rotate in a tightened mode at the four corners in the annular chain, it is ensured that hanging pieces and packages are stably conveyed, the rotating teeth are meshed into the clamping chain, the second driving motors are powered on to start and pull the clamping chain to be wound, and the rotating teeth can be driven to rotate to reduce shaking.

The invention relates to the technical field of polymer compositions, and particularly discloses a degradable bio-based food packaging material and a preparation method thereof.The degradable bio-based food packaging material is prepared from polylactic acid, ITA esterified bacterial cellulose, CSL-ITA esterified bacterial cellulose, polycaprolactone glycol, acetyl tributyl citrate, a photoinitiator and tocopherol; the preparation method comprises the following steps: esterifying bacterial cellulose hydrogel with itaconic anhydride, grafting with sodium copper chlorophyllin, dehydrating with gradient ethanol, and drying with supercritical CO2 to obtain modified powder; according to the preparation method, the interfacial compatibility of the bacterial cellulose and the polylactic acid is enhanced through ITA esterification, the illumination antibacterial function is given by utilizing CSL grafting, the polycaprolactone glycol and the acetyl tributyl citrate are synergistically used for toughening and improving the brittleness, the photoinitiator is added, the photoinitiator is added for mixing, and ultraviolet crosslinking curing is performed after film forming. The tocopherol protects the stability of the antibacterial structure of the CSL, the water resistance is improved through photo-crosslinking, and the material is degradable and meets the food packaging requirement.

The invention relates to the field of food packaging and coatings, and provides a bio-based fluoride-free environment-friendly oil-proof agent for food packaging paper and paperboards, which is simple in preparation process, green and environment-friendly and has the bio-based raw material proportion of 70% or above. The bio-based fluoride-free environment-friendly oil-proof agent is characterized in that the bio-based fluoride-free environment-friendly oil-proof agent is prepared by synergistic micro-nanocrystallization of paper pulp fibers, starch and inorganic particles under the action of high-speed shearing and grinding; the prepared oil-proof agent can be coated on the surfaces of sized or unsized paper, paperboards and paper pulp molded products by a conventional coating method, the coated finished product has good oil-proof performance, the coating weight is 1.5-15g / m < 2 >, and the oil-proof grade tested by a Kit method after drying can reach 12 grade to the maximum. Compared with a fluoride-free oil-proof agent on the market at present, the bio-based fluoride-free environment-friendly oil-proof agent disclosed by the invention can obtain good oil-proof performance under a relatively low coating weight, is biodegradable and is easy to recycle and reuse.

This invention discloses a bio-based PHA oil-blocking and moisture-permeable coating for hamburger paper, the coated paper, and its preparation method, belonging to the fields of bio-based polymer materials and paper-based food packaging technology. The coating is an aqueous dispersion of PHA, mainly comprising semi-crystalline matrix PHA and low-crystallinity or amorphous toughening PHA. Its core feature is that after the coating dries and forms a film, it spontaneously forms a functional gradient structure along the coating thickness direction: the interfacial layer near the paper substrate is rich in toughening PHA to enhance toughness and adhesion; while the surface layer is rich in matrix PHA to maximize oil-blocking performance. Through this functional gradient structure design, this invention balances the oil-blocking, moisture-permeable, and flexible properties of the packaging material, and possesses biodegradable environmental characteristics, making it suitable for high-oil food packaging.

The invention discloses a preparation method and application of an environment-friendly easily-degradable hydrogel coating, and relates to the technical field of hydrogel coatings. The coating is a coating comprising chitosan, acrylic acid, sericin, silk fibroin, silk peptide, tea polyphenol, a photoinitiator, a plasticizer and a leveling agent. The preparation method comprises the following steps: (1) preparing the coating containing the components; (2) coating the surface of food packaging paper with the coating liquid in a slit coating manner; and (3) performing ultraviolet light initiation to obtain the coating. The hydrogel coating has a synergistic effect with the sericin, the silk fibroin, the silk peptide and the tea polyphenol to form a compact and uniform network structure, so that the water-retaining property, the mechanical strength, the flexibility and the antibacterial property are enhanced; the preservative not only has the advantages of environmental protection and degradability, but also has the functions of moisturizing, antibiosis and preservation, and can significantly prolong the shelf life of food and improve the quality. The environment-friendly packaging paper is applied to food packaging paper, not only conforms to the green packaging trend, but also expands the use scenes of environment-friendly materials in the fields of fresh food, baking and the like.

The invention discloses a food packaging bag directional conveying device and method, and relates to the technical field of automatic conveying and logistics equipment.The food packaging bag directional conveying device comprises a position and posture detection module, real-time position and posture data of a packaging bag at a key node are captured through a sensor array, the data are processed through an image recognition algorithm to extract steering angle features, and the steering angle features are obtained; the steering correction module is used for comparing the obtained current direction deviation value of the packaging bag with a preset standard angle, if the deviation value exceeds a threshold value, a steering correction mechanism is activated, and corrected packaging bag posture data are obtained by adjusting the angle of a mechanical arm at a node; according to the oriented conveying equipment and method for the food packaging bags, it is guaranteed that the packaging bags are efficiently and stably conveyed in a complex environment, and the reliability and adaptability of an automatic production line are improved.

The invention discloses high-barrier waterproof and oil-proof meal package paper and a preparation method thereof, and relates to the technical field of food packaging materials. The invention discloses a preparation method of high-barrier waterproof and oil-proof meal package paper, which comprises the following steps: coating raw paper with waterproof and oil-proof glue to obtain the high-barrier waterproof and oil-proof meal package paper, the waterproof and oil-proof glue comprises the following raw materials in percentage by weight: 1-2% of modified chitosan, 4-5% of carboxymethyl cellulose, 0.3-0.5% of nano cellulose, 0.15-0.25% of modified nano mesoporous silica, 0.3-0.42% of a bio-based cross-linking agent and the balance of a solvent, and the sum of the weight percentages of the raw materials is 100%. The prepared meal package paper is good in waterproof and oil-proof effects, and the folding strength of the coating is high.

The invention discloses a bacteriostatic food packaging bag and a preparation method thereof, and relates to the technical field of food packaging, the bacteriostatic food packaging bag comprises the following components by weight: 12-22 parts of bamboo fiber; 55 to 80 parts of TPS (Thermoplastic Polystyrene); 15-20 parts of a modified ethylene composite copolymer; 15 to 20 parts of modified chitosan; wherein the modified ethylene composite copolymer is obtained by polymerizing active group-containing ethylene and one of vinyl acetate, butene, hexene or octylene according to a molar ratio of 10: (3-6); the active group is at least one of amino and sulfonic acid group; the modified chitosan is sulfo-grafted chitosan, and the mass grafting rate is greater than 0.1 wt%. The preparation method has the advantages that the compatibility of a composition formula is improved through the modified ethylene composite copolymer and the modified chitosan, a uniform net structure is formed in a cross-linking reaction to serve as a supporting framework, the overall mechanical structure performance is enhanced through the bamboo fibers which are synergistically and uniformly distributed in the composition formula, and the degradable and non-toxic effects are achieved through the cooperation of the bamboo fibers and the TPS.

The invention relates to the technical field of high polymer material processing, in particular to a preparation method of a high-heat-resistance transparent PP sheet suitable for microwave heating food packaging, and the preparation method comprises the following steps: S1, mixing homo-polypropylene and co-polypropylene according to a set proportion; s2, preparing composite powder; s3, carrying out melt blending on the composite powder and carrier resin to prepare master batches; s4, mixing the pretreated resin matrix with the master batch; s5, forming an unshaped sheet through melt layering and compounding; s6, carrying out multi-roll calendering unit treatment; s7, staged cooling treatment is carried out; and S8, the surface of the base material sheet is subjected to corona treatment and coated with a barrier coating. Through the innovative synergistic effect of the nucleating agent and the gradient processing technology, the heat resistance and mechanical strength of the polypropylene sheet are remarkably improved while the high transparency of the polypropylene sheet is kept, processing degradation is effectively inhibited, and the breakthrough progress of the high-performance microwave food packaging material is achieved.

The invention discloses an anti-ultraviolet, antibacterial, antioxidant and high-light-transmittance food packaging film, and belongs to the field of food packaging materials, and the anti-ultraviolet, antibacterial, antioxidant and high-light-transmittance food packaging film comprises 40-60 parts of a chitosan solution; 40-60 parts of a gelatin solution; 0.01 to 0.2 part of nitrogen-doped carbon quantum dots; 0.001 to 0.02 part of an antibacterial agent; the invention further discloses a preparation method of the food packaging film. The preparation method comprises the following steps: S1, preparing a chitosan solution; s2, preparing a gelatin solution; s3, preparing nitrogen-doped carbon quantum dots; s4, the chitosan solution, the gelatin solution, the nitrogen-doped carbon quantum dots and the antibacterial agent are mixed and dried, and the multifunctional food packaging film is prepared. Generally speaking, the transparency of the food packaging film is greatly reduced while the ultraviolet barrier property of the food packaging film is improved. The nitrogen-doped carbon quantum dot disclosed by the invention has excellent absorption performance on ultraviolet light in a range of 200-400nm, almost has no absorption on visible light of 400nm or above, and has excellent oxidation resistance. The food packaging film prepared by the invention not only has excellent ultraviolet blocking capability and high visible light transmittance, but also has remarkable antibacterial and antioxidant characteristics, and shows an excellent fresh-keeping effect on strawberries and fresh-cut apples.

The invention belongs to the technical field of food packaging and fresh-keeping materials, and discloses an ethylene adsorption and pH / pectinase double-response intelligent antibacterial composite film as well as a preparation method and application thereof. The composite film comprises a base film and a functional carrier distributed in the base film, the functional carrier is a material ZIF-8-cinnamyl aldehyde-pectin capable of adsorbing ethylene and responding to pH and pectin, and the base film comprises a film-forming polymer and a natural antibacterial agent. According to the composite film, efficient adsorption of ethylene released in the storage period of fruits and vegetables is achieved through a porous structure of ZIF-8, meanwhile, a synergistic effect is formed by an acid environment naturally generated in the fruit and vegetable ripening and rotting process and pectinase, and intelligent slow release of cinnamyl aldehyde loaded on ZIF-8 is accurately triggered; cinnamyl aldehyde can form a double-channel intelligent antibacterial system with the natural antibacterial property of chitosan in a film base material and the metal ion antibacterial property of ZIF-8, maturation and aging of typical respiratory climacteric fruits and vegetables can be remarkably delayed, and the antibacterial film has extremely high industrial application potential.