5430results about "Flexible covers" patented technology

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The invention discloses a large-size green packaging carton and a preparation process thereof, and relates to the field of packaging box preparation. The environment-friendly composite material comprises the following raw materials in parts by weight: 50-80 parts of plant fiber slurry, 10-25 parts of a modified starch-based adhesive, 5-15 parts of a nanoscale inorganic reinforcing filler, 1-5 parts of a degradable water repellent agent, 0.5-3 parts of a cross-linking agent and 2-8 parts of starch and plant fiber composite buffer microspheres. According to the preparation method, full-environment-friendly raw materials such as plant fiber slurry and a modified starch-based adhesive are selected and matched with starch and plant fiber composite buffer microspheres, and optimized processes such as segmented temperature control pressurization molding, adhesive gelatinization treatment, stirring speed reduction and microsphere structure protection are combined; and through coating of the degradable polymer coating and micron-sized hydrophobic texture imprinting, synergistic improvement of high compressive strength, excellent buffering performance, excellent hydrophobic and damp-proof effects and high degradation rate of the carton is achieved.

The invention discloses a PHA-acrylic acid structural unit water-based dispersion based on interface engineering regulation and control, a preparation method thereof and application of a paper-based barrier coating, and belongs to the technical field of high polymer materials, interface engineering and water-based coatings. The stable interface layer is constructed in situ between the crystalline PHA and the acrylic resin through the amphiphilic polymer, so that the problems of poor compatibility and film forming defects of a bio-based material are effectively solved. The dispersion can realize excellent waterproof, oil-proof and gas barrier effects by only needing a relatively low coating weight, and the material consumption is remarkably reduced. The unique gradient structure of the coating has excellent mechanical adhesive force and efficient re-pulping and recycling characteristics, and the technical defect that a traditional barrier coating is difficult to recycle is overcome. And an ideal solution with high performance and high safety is provided for green packaging.

The invention discloses environment-friendly high-barrier packaging paper and a preparation method thereof, and belongs to the technical field of paper product manufacturing. The method comprises the following steps: dispersing bleached sulfate softwood pulp in an aqueous solution of TEMPO and NaBr, adding a NaClO solution, adjusting the pH value, carrying out a reaction, washing the product obtained by the reaction, and carrying out high-pressure homogenization to obtain TEMPO oxidized nanocellulose (TOCNF); mixing the bleached sulfate softwood chemical pulp, hardwood pulp and viscose fibers, pulping, papermaking and the like to obtain original paper; then, TOCNF and waterborne epoxy modified acrylic emulsion are mixed, and a mixed coating is prepared; and finally, coating the surface of original paper with the coating according to a certain mass ratio, and carrying out hot-pressing curing to obtain the environment-friendly high-barrier packaging paper. The packaging paper is excellent in mechanical property, high in barrier property, good in surface uniformity and printing property, environment-friendly and degradable in raw materials, simple to prepare and low in cost.

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 field of packaging materials, and discloses low-temperature heat-sealing water-based coated paper and a preparation method and application thereof.The water-based coated paper comprises a base paper layer and a water-based coating, and the water-based coating comprises water-based ethylene-acrylic acid copolymer emulsion, modified nano-silica, a coalescing agent and water; a cardanol derivative is introduced into the water-based ethylene-acrylic acid copolymer emulsion as a functional component; the cardanol derivative is prepared by reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and then grafting with acryloyl chloride. The preparation method comprises the following steps: reacting epoxidized cardanol with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; the modified nano silicon dioxide is prepared by mixing aminated nano silicon dioxide and chitosan and adding a cross-linking agent prepared by grafting phytic acid and ethylene glycol diglycidyl ether. The water-based coating paper prepared by the invention overcomes the defects that the existing BOPP film is not environment-friendly, and the conventional coating paper is high in heat sealing temperature and easy to stick; meanwhile, good mechanical properties, water resistance and flame retardance are achieved.

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 compostable and reslurrable mineral-based dual-scale barrier coating as well as preparation and application thereof, and belongs to the technical field of water-based and reslurrable barrier materials. In order to overcome the defects of high coating weight, large color difference or difficulty in recovery in the prior art, a compact barrier is constructed through double-scale collaborative design of interlayer intercalation of layered double hydroxides and interparticle metal micro-networks. The method has the prominent advantage that high-efficiency water-oxygen barrier better than that of a conventional scheme can be realized only by using an extremely low coating amount. Meanwhile, the coating strictly controls color difference to maintain high whiteness of the paper, has pH responsiveness, can be quickly unlapped and dispersed under an acidic condition, and is easy to re-pulp. The coating does not contain PFAS and PVDC, and unification of high barrier, high whiteness and recoverability is achieved.

The invention discloses a material level intelligent sensing and early warning system in the silo unloading process, and relates to the technical field of silo material level intelligent sensing. The method comprises the following steps: a data acquisition module used for acquiring a multi-modal data stream; the model construction module is used for constructing a normal unloading model based on the multi-modal data flow and a preset physical mechanism constraint; the state judgment module is used for extracting a current feature vector from the multi-modal data stream; comparing the current feature vector with a feature distribution range in a multi-dimensional feature space determined by a normal unloading model, and judging a current material flow state; according to the invention, material flow abnormal symptoms can be captured in time, early warning of the blocking risk is realized, the production rhythm is prevented from being disturbed by material flow interruption, the potential safety hazard caused by manual entering into the silo for troubleshooting is reduced, the grain loss and equipment damage risks caused by long-term retention and mildew of materials are reduced, and the storage safety and the operation stability of a grain storage system are guaranteed.

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 invention discloses a bacteriostatic and antiviral bamboo pulp paper-based sanitary isolation bag as well as a preparation method and application thereof, and belongs to the field of functional paper-based packaging materials. The isolation bag takes bamboo pulp fiber paper as a base material, and the surface of the isolation bag is coated with a water-based polyhydroxyalkanoate functional coating. According to the preparation method, a special polyphenol derivative-chitosan quaternary ammonium salt-nano zinc oxide organic-inorganic hybrid factor is introduced, and the problem of agglomeration of nano particles is effectively solved by utilizing the special bridging effect of polyphenol, so that high-density cation capture and oxidation inactivation sites are constructed on the surface of the coating. Compared with the prior art, the method has the advantages that the method does not need to depend on organic fluorine compounds, and the excellent waterproof and oil-proof barrier effect and the efficient inactivation of viruses can be achieved only through the extremely low coating amount. In addition, the isolation bag has unique environmental chemical responsiveness, can be efficiently dissociated under the alkaline condition to facilitate repulping recovery, can be completely biodegraded in the natural environment, and perfectly considers the requirements of biological safety protection and green environmental protection.

The invention discloses a preparation method of an edible pectin film capable of monitoring and prolonging fruit freshness, which comprises the following steps: carrying out oxidation reaction on pectin and sodium periodate, then terminating the reaction and purifying to obtain oxidized pectin; the preparation method comprises the following steps: dissolving oxidized pectin in water, then adding histidine, and carrying out heating reaction at 60-120 DEG C for 1-3 hours to obtain a reaction product with pH-responsive fluorescence characteristics; adding a calcium chloride aqueous solution as a cross-linking agent into the reaction product, simultaneously adding glycerol as a plasticizer, stirring and mixing for 5-15 minutes at the temperature of 50-70 DEG C, and then stirring and mixing for 1.5-2.5 hours at the temperature of 20-30 DEG C to obtain a uniform film forming solution; pouring the film-forming liquid into a film, and drying to obtain an edible pectin film; the invention also provides the edible pectin film prepared by the preparation method. The prepared edible pectin film is mainly used for packaging fruits, and the freshness of the fruits can be visually displayed through fluorescence change while the fruits are kept fresh.

The invention relates to a multilayer packaging material with high barrier property and application thereof. The multi-layer packaging material at least comprises three layers, namely a layer A, a layer B and a layer C, wherein the layer B is located between the layer A and the layer C; the layer A is prepared from the following raw materials: first biodegradable polyurethane and a cellulose nanocrystal graft which is obtained by performing grafting treatment on cellulose nanocrystal after hydrophobic modification, and the content of the cellulose nanocrystal graft is 1wt%-10wt% of that of the first biodegradable polyurethane; the raw material of the layer B comprises biodegradable polyester containing a glycollic acid structural unit, and the content of the glycollic acid structural unit is not less than 60% mol; the raw material of the layer C comprises second biodegradable polyurethane. The hydrophobic modified cellulose nanocrystals are uniformly dispersed in the layer A, so that the adsorption of water vapor on the layer A is reduced, the permeation of the water vapor is hindered, and the barrier property of the whole material is improved.

The invention discloses an antibacterial sanitary towel packaging bag and a preparation method thereof. The antibacterial sanitary towel packaging bag comprises a base material layer, an antibacterial layer and a leakage-proof layer. The base material layer is prepared by blending modified polylactic acid, polybutylene adipate and the like and contains a degradation accelerant; the antibacterial layer contains antibacterial peptide-loaded nano montmorillonite, chitosan and the like, and loofah sponge fiber enhances slow release; and the leakage-proof layer is an ethylene-vinyl acetate copolymer and modified silicon dioxide blended film and is provided with breathable micropores. The preparation method comprises the steps of forming the base material layer, coating the antibacterial layer and the like, and process parameters of each layer are accurately controlled. According to the packaging bag, through cooperation of three layers, the bacteriostasis rate of the packaging bag on escherichia coli and staphylococcus aureus in 24 hours is higher than 99%, the degradation rate of the packaging bag in 83 days is higher than 88%, the oxygen permeability is 4.5-5.2 cm < 3 > / (m224h 0.1 MPa), and the packaging bag has the advantages of long-acting antibiosis, air permeability, leakage prevention, environmental protection, degradation and good mechanical properties, and meets the storage and use requirements of sanitary napkins.

The invention relates to the technical field of composite films, and particularly discloses a low-temperature heat-sealable high-strength BOPP composite film and a preparation process thereof.The BOPP composite film is prepared by adopting three-layer co-extrusion and two-way stretching processes, and the balance between high strength and low-temperature heat sealability is achieved. The composite film comprises an anti-adhesion surface layer, a core layer and a low-temperature heat-sealing layer; the anti-adhesion surface layer is prepared from the following raw materials: homo-polypropylene, a composite anti-adhesion agent, a slipping agent and PP-g-MAH; the composite anti-adhesion agent is prepared from modified silicon dioxide and modified diatomite in a mass ratio of 3 to 1; the raw materials of the core layer comprise homo-polypropylene, an antistatic agent and a coupling agent, and the raw materials of the low-temperature heat sealing layer comprise an ethylene-vinyl acetate copolymer, PP-g-MAH, a polyolefin elastomer, POE-g-MAH, a modified nucleating agent and an antioxidant, so that the balance of high strength and low-temperature heat sealability is realized, interlayer performance complementation is realized, the mechanical strength is improved, the heat sealing temperature is reduced, and the service life is prolonged. The overall peel strength is improved, and no layering phenomenon exists during stretching.

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 provides a high-toughness plastic packaging film material and a preparation method thereof, and belongs to the field of metallocene polyolefin plastics. The high-toughness plastic packaging film material is prepared from the following chemical raw materials: 80 to 90 parts of metallocene polyethylene resin, 5 to 8 parts of supramolecular cross-linking agent, 6 to 10 parts of core-shell type modifier, 3 to 5 parts of ethylene-vinyl acetate copolymer, 2 to 4 parts of stearic acid modified nano calcium carbonate, 2 to 3 parts of polyolefin elastomer, 0.2 to 0.5 part of di (3, 4-dimethyldibenzylidene) sorbitol, 2 to 5 parts of thermotropic liquid crystal polymer and 0.4 to 0.7 part of antioxidant. 0.8 to 1.2 parts of a lubricant and 0.5 to 1.0 part of an antistatic agent. Through the compatibility design of a toughening mechanism, the synergistic balance of an enhancing mechanism and the optimization of transparency guarantee, the functions of all the components in a metallocene polyethylene resin matrix are complemented, and the ultrahigh toughness, high strength and high transparency of the film material are achieved.

Methods and apparatus for vacuum forming and subsequently applying topical coatings fiber-based food containers. The slurry includes one or more of an embedded moisture barrier, vapor barrier, and oil barrier, and the topical coating comprises one or more of a vapor barrier, a moisture barrier, an oil barrier, and an oxygen barrier. For food containers having deep sidewalls, a spray coating system includes a first nozzle for applying a full cone spray pattern to the bottom surface of the container, and a second nozzle for applying a hollow cone spray pattern to the inside surfaces of the side walls.

A lyophilization container includes a first section having a first layer, a second layer aligned with the first layer, and a cavity defined by the alignment of the first and second layers, where at least one of the first and second layers is preformed to have a three-dimensional shape. A lyophilization fixture includes a base member and a lid member. The lid member is movable between a first position and a second position relative to the base member. The base member and lid member together define a housing that receives at least a portion of a lyophilization container.

The application relates to the technical field of packaging films, and discloses an antistatic plastic packaging film and a preparation process.The antistatic plastic packaging film comprises 100 parts by weight of polyethylene, 1-6 parts by weight of phenolic resin polyaniline antistatic agent and 0.2-0.3 parts by weight of an antioxidant.The dodecyl succinic anhydride esterified phenolic resin contains carboxyl groups, can be used as a protonic acid, is doped into polyaniline through an in-situ polymerization reaction, makes imine nitrogen atoms of the polyaniline protonate, forms a charged excited state polaron, and thus the conductivity of the polyaniline is improved, the resistance of the polyethylene is reduced, and the antistatic performance of the packaging film is improved.The dodecyl succinic anhydride esterified phenolic resin and the doped polyaniline have good compatibility with the polyethylene, have a certain reinforcing effect on the polyethylene, and make the film material have higher tensile strength and elongation at break.

The invention belongs to the technical field of corrugated paperboards, and is characterized in that wood fibers and modified bamboo fibers prepared by reaction of allyl bamboo fibers, 1, 4-butanediol di (mercaptoacetate) and magnolol are pulped, a biodegradable water-resistant auxiliary agent is added for hydrophobic modification, papermaking and shaping are carried out to prepare water-resistant base paper, and the water-resistant base paper is prepared by the following steps: pulping the modified bamboo fibers and the biodegradable water-resistant auxiliary agent. And finally, preparing a surface paper layer, a corrugated medium paper layer and an inner paper layer from the water-resistant raw paper, and bonding and pressing to obtain the corrugated board. Magnolol groups grafted on the surfaces of the modified bamboo fibers can improve the water absorption performance of the fibers, and the hydrophobicity of the corrugated board is improved through the synergistic effect of the magnolol groups and the biodegradable water-resistant auxiliaries; the surface of the biodegradable water-resistant auxiliary agent is embedded with a carboxylated nano-cellulose structure, so that the biodegradable water-resistant auxiliary agent has deformation resistance; the epoxidized soybean oil is used as a core part and has excellent hydrophobicity; through combination of a polyphenol structure of tannic acid and hydrogen bonds of water-resistant base paper fibers, the mechanical properties of the corrugated board are improved, and the corrugated board has excellent biodegradability, hydrophobicity and mechanical strength.

There is disclosed a bag having a tubular body with a top open end and a bottom closed end. The tubular body has a larger open diameter at the top open end. The tubular body narrows into a narrower open diameter adjacent to a bottom closed end. The tubular body in a flattened two-fold condition has a pair of side edges extending from a top edge to a bottom edge. The top edge delimits the top open end. The bottom edge delimits the bottom closed end. The pair of side edges are generally parallel to one another in a first portion adjacent to the top edge.

The invention discloses a silica powder modified paperboard material of embossed frame paper for cigarettes and a preparation method of the silica powder modified paperboard material, and belongs to the field of advanced inorganic non-metallic materials. The material comprises bleached chemical wood pulp, core-shell structure in-situ modified nano silicon micropowder, an auxiliary agent and a latent temperature-sensitive cross-linking agent, a modification system contains a compound silane coupling agent and amino modified organosilane, and a dual network of static triple cross-linking and dynamic secondary cross-linking is formed; the nanometer silicon micro powder is of a core-micro-nano protrusion-shell multilevel structure, a shell layer is thermoplastic resin containing latent epoxy groups, and a double-peak particle size distribution design is adopted. The preparation process is realized through in-situ generation modification, high-speed shearing fusion and an embossing-shaping integrated closed-loop control process, and is adaptive to an existing fourdrinier papermaking production line. The product quantification is 210-220 g / m < 2 >, the transverse stiffness is larger than or equal to 210 mN.m, the embossing retention rate is larger than or equal to 99.5%, after 50 cycles at the temperature of-5 DEG C-40 DEG C and the humidity of 30%-80%, the stiffness is reduced by smaller than or equal to 3%, the barrier property is reduced by smaller than or equal to 6%, the printing adsorption uniformity error is smaller than or equal to 3%, and the barrier property and the environmental protection property are excellent. The method solves the problems of agglomeration, embossing resilience, multi-performance contradiction, poor environmental stability and other pain points of conventional modified filler, realizes the cooperation of low quantification and high performance, conforms to the high-end and green requirements of the tobacco industry, can pass the application of strategic emerging industry priority review channels, and has a wide application prospect.

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.

The invention discloses a high-barrier degradable vegetable and fruit preservative film based on multi-layer compounding and a preparation method thereof, belongs to the technical field of food packaging materials, and aims to solve the technical problem that the barrier property, the mechanical property and the antibacterial property of the degradable vegetable and fruit preservative film in the prior art need to be further improved. The degradable vegetable and fruit preservative film comprises a first layer, a second layer and a third layer which are sequentially laminated, and the first layer is prepared from, by weight, 65-75 parts of polylactic acid, 4-8 parts of maleic anhydride grafted polylactic acid, 2-4 parts of modified carbon nitride, 1-3 parts of alizarin microcapsules, 3-6 parts of modified lignin and 1-2 parts of auxiliary additives; through the synergistic effect of the modified carbon nitride, the alizarin microcapsules and the modified lignin, the barrier property, the mechanical property and the antibacterial property of the degradable vegetable and fruit preservative film are further improved.

The invention discloses a slow-release antibacterial and antioxidant composite preservative film and a preparation method thereof. The slow-release antibacterial and antioxidant composite preservative film is prepared from a chitosan matrix and Chuzhou chrysanthemum essential oil nano-emulsion loaded in the chitosan matrix, the Chuzhou chrysanthemum essential oil nano-emulsion comprises Chuzhou chrysanthemum essential oil, a surfactant and a cosurfactant, and the average particle size of the Chuzhou chrysanthemum essential oil nano-emulsion is smaller than 200 nm; the composite preservative film has the function of slowly releasing the Chuzhou chrysanthemum essential oil and shows antibacterial and antioxidant activity; the preparation method comprises the following steps: firstly preparing Chuzhou chrysanthemum essential oil into a nano-emulsion by adopting a nano-encapsulation method through a high-pressure homogenization method to form the Chuzhou chrysanthemum essential oil nano-emulsion, then embedding the Chuzhou chrysanthemum essential oil nano-emulsion into chitosan to prepare an active chitosan composite film, and finally applying the antibacterial coating material to food preservation. The antibacterial coating film not only can effectively inhibit pathogenic microorganism infection in berry storage and logistics transportation in a wider spectrum, but also can regulate physiological metabolism of picked berries, delay the senescence process and reduce loss of internal moisture.

The invention relates to the field of high polymer materials, and particularly discloses a high-oxygen-barrier moisture-barrier PE film and a process. The high-oxygen-barrier moisture-barrier PE film comprises a corona layer, a barrier layer and a heat sealing layer which are connected in sequence, the barrier layer comprises the following raw materials in parts by weight: 90-95 parts of polyethylene and 5-10 parts of polyvinylidene chloride, and the heat sealing layer is made of a polyethylene material; in addition, the preparation method provided by the invention has the advantages that the oxygen and moisture resistance of the polyethylene single film is improved, and meanwhile, the printing requirement is met.

A paper bottle system for pharmaceuticals is disclosed. The system includes a first frustum-shaped conical section formed of heavy-weight paper, a second frustum-shaped conical section formed of a biodegradable material, a biodegradable lid, and an aqueous coating. The conical sections are angled between 5-8 degrees from vertical, allowing for efficient nesting and stacking. The system is designed to be environmentally friendly, easily recyclable, and optimized for short-term use. When disposed of in a landfill, the paper bottle system quickly breaks down, contributing to soil health and reducing environmental impact.

The invention discloses a biodegradable flexible conductive high-hydrophobicity sensor substrate and a preparation method and application thereof.The preparation method comprises the steps that a polylactic acid electrostatic spinning solution and a chitosan / polyethylene oxide mixed electrostatic spinning solution are prepared on the basis of a safe and non-toxic food-grade material; the preparation method comprises the following steps: sequentially spinning by adopting an electrostatic spinning technology to form a sandwich structure flexible substrate, transferring a carbon nano tube conductive film, and tightly attaching the carbon nano tube conductive film to the surface of a polylactic acid layer of the sandwich structure substrate, thereby finally obtaining the flexible conductive high-hydrophobicity composite substrate. According to the invention, a hydrophobic-hydrophilic-hydrophobic sandwich structure is constructed through multi-layer electrostatic spinning, and a surface carbon nanotube conductive layer is cooperated, so that the substrate has high hydrophobicity, excellent conductivity and flexible tensile property. The preparation method has the characteristics of controllable process, low cost and environmental friendliness, and the obtained substrate is expected to have wide application prospects in the fields of food packaging, sensor substrates, intelligent wearing, health monitoring and the like.