536 results about "Plastic wrap" patented technology

The invention discloses basalt fiber reinforced anti-crack road concrete and a preparation method thereof, and belongs to the technical field of concrete preparation, and the preparation method specifically comprises the following steps: transferring a concrete precursor into a mold, transferring the mold to a vibration table, vibrating for 1-2 minutes, scraping the raised part of the surface by using a scraper, covering the surface of the material with a preservative film, and drying to obtain the basalt fiber reinforced anti-crack road concrete. Performing post-treatment to obtain the anti-crack concrete. The preparation method comprises the following steps: cleaning basalt fibers, activating, carrying out surface modification, curing to obtain composite basalt fibers, hydrolyzing a borosilicate monomer to prepare modified borosilane with a double-bond structure, converting the double-bond structure into an epoxy group through an epoxidation reaction to obtain a modified curing agent, and preparing the composite basalt fibers by using the modified curing agent and the modified borosilane as additives. And mixing with cement and other materials to obtain the wear-resistant, fracture-resistant and corrosion-resistant anti-crack concrete.

The invention relates to the technical field of concrete structure maintenance, and discloses an adjustable pier column intelligent water-saving spraying maintenance method and a maintenance device.The method comprises the following steps that a cover body of a pier column is arranged on the periphery of the pier column, and pier column surface humidity data are collected through sensing devices arranged on the periphery and the surface of the pier column; whether the spraying triggering condition is met or not is judged in combination with a preset control strategy, the control strategy is adjusted based on one or more of the environment temperature, the wind speed, the time and the historical spraying data, the spraying system is controlled to execute spraying operation when the spraying triggering condition is met, and the spraying operation is used for a spraying head opening area. Recycled water generated by spraying is collected through the seepage and drainage pipe. The closed or semi-closed spraying space is formed by arranging the cover body module, and the fresh-keeping film or tarpaulin wrapping structure is combined, so that local humidity stable control and evaporation suppression of the spraying environment are realized, and the effects of remarkably improving the spraying maintenance efficiency and reducing the water loss are achieved.

The invention relates to a double-layer preservative film for prolonging the shelf life of frozen beef and mutton after unfreezing and a preparation method of the double-layer preservative film. According to the preparation method of the angelica dahurica extract-gliadin nano-particles, the angelica dahurica extract-gliadin nano-particles can be used for preparing a double-layer preservative film, and the preservative film is a natural component and is environmentally friendly and safe. The preservative film is of a double-layer structure, the mechanical performance is enhanced through the double-layer film structure, and meanwhile the preservative film has excellent oxygen and water vapor barrier performance and an antibacterial effect. According to the preservative film disclosed by the invention, slow release of active ingredients is realized by utilizing the Pycnogenin-gliadin nanoparticles, so that the antioxidant and antibacterial effects are remarkably improved, and the quality guarantee period of meat is prolonged. In addition, the preservative film does not need to be in direct contact with food in practical application, potential safety hazards of the food are further reduced, the operation process is simplified, pollution is avoided, a user can conveniently use the preservative film, the preservative film has the advantages of efficient preservation and environmental protection, and the preservative film has good application prospects and value.

The invention discloses a preparation method of a multifunctional polyvinyl composite film and application of the multifunctional polyvinyl composite film in food preservation. The preparation method comprises the following steps: firstly, preparing Ag-coated MOF through a hydrothermal method, then uniformly dispersing the Ag-coated MOF and tannic acid into a carboxymethyl chitosan solution, and carrying out crosslinking modification on the Ag-coated MOF; and coating the prepared CMCS / TA / Ag (at) MOF mixed solution on a polyethylene film treated by oxygen plasma, and drying to form a film, so as to obtain the multifunctional polyethylene-based composite film. The CMCS and the TA are adopted to perform crosslinking modification on the Ag-coated MOF, so that the stability of the Ag-coated MOF can be further improved, and the release of silver ions is reduced. Compared with a common PE preservative film, the composite film prepared on the basis has better barrier capacity and mechanical property, and has antibacterial, anti-ultraviolet and anti-oxidation effects. The multifunctional preservative film is convenient to use and low in price, and has an important application prospect in the aspect of fresh-keeping packaging of meat products.

The invention discloses an antibacterial film loaded with a fucoxanthin nano material and a preparation method of the antibacterial film. The antibacterial film is prepared by taking a nitrogen-rich hollow carbon material-fucoxanthin (NHC-FX) nano material as an antibacterial photosensitizer, chitosan as a substrate of a film and glycerol as a plasticizer of the film through a solution casting method. The antibacterial film disclosed by the invention is good in hydrophobicity and high in stability, can reduce transmission of ultraviolet light, and has a good photodynamic antibacterial effect. The antibacterial food packaging material can be used as an antibacterial food packaging material or a preservative film, can prevent food from being polluted by microorganisms, and can isolate damage of ultraviolet rays to the food.

The invention relates to the technical field of food packaging, and discloses a composite preservative film as well as a preparation method and application thereof. The composite preservative film comprises a pectin film layer and a chitosan film layer which are arranged up and down, the pectin film layer contains an additive, the chitosan film layer contains lignin, and the additive is anthocyanin and / or an anthocyanin silver ion compound. The method comprises the following steps that S1, under the condition that a solvent exists, pectin and an additive are mixed I, then a pectin film layer is prepared through a tape casting method, and the additive is anthocyanin and / or an anthocyanin silver ion compound; in the presence of a solvent, chitosan and lignin are mixed II, and a chitosan film layer is prepared through a tape casting method; and S2, compounding the pectin film layer and the chitosan film layer to prepare the composite preservative film. The composite preservative film has antibacterial activity on various food spoilage bacteria and is high in oxidation resistance.

The utility model provides a mechanism for wrapping and packaging a spherical object by using a preservative film, which comprises a rack, a preservative film conveying and cutting mechanism, a mechanical aperture mechanism, a clamping jaw mechanism, a torsion mechanism, a turnover mechanism and a preservative film exhaust mechanism which are arranged on the rack, and a controller for controlling the mechanisms to work, and the photoelectric detection switch is used for sensing the operation action. A preservative film is laid and cut through the preservative film conveying and cutting mechanism, then spherical fruits and vegetables are used for pressing the preservative film into the middle of the mechanical aperture mechanism, and the preservative film is placed on the clamping jaw mechanism. After the photoelectric detection switch detects the putting-in action, the controller controls the clamping jaw mechanism to be closed to grab the spherical fruits and vegetables, then the mechanical aperture mechanism is closed, the preservative film is closed, and the spherical fruits and vegetables are wrapped; the torsion mechanism rotates the clamping jaw mechanism, so that the upper end of the preservative film is rotated and knotted, and meanwhile, the preservative film exhaust mechanism works synchronously and assists in exhausting, so that the effect of laminating and packaging the preservative film is achieved.

The invention discloses a stator assembly, a motor and a household appliance, and relates to the technical field of motors. The stator assembly comprises a stator iron core and a plastic coating part, the stator iron core is coated with the plastic coating part, the plastic coating part is provided with a spigot boss on the end face of the opening part, and the spigot boss is matched with the end cover in an abutting mode. The height of the stator core is h0, the distance between the first end face of the opening part and the second end face of the stator core is h, when h0 is larger than or equal to 20 mm, h = h0 * 0.5 + S1, and S1 is larger than or equal to 6 mm and smaller than or equal to 10 mm. When h0 is smaller than 20 mm, h = h0 * 0.65 + S2, and S2 is larger than or equal to 5 mm and smaller than or equal to 8 mm. The value of h is designed according to the calculation result of the formula, so that the relationship between the material consumption of the plastic coating part and the noise of the motor can be balanced, the noise of the motor meets the requirement, the material consumption of the plastic coating part can be in a proper range, and the production cost is reduced.

The invention provides ice crystal resistant frozen dough and application thereof in baked food. Comprising the following steps: S1, uniformly mixing weighed flour, salt, white granulated sugar and dry yeast; s2, adding water and the gel loaded with the deacylated antifreeze polypeptide-astragalus membranaceus polyphenol coupling agent, and uniformly stirring to prepare fresh dough with smooth surface; s3, cutting the fresh dough into small dough, wrapping the small dough with a preservative film, quickly freezing the small dough in a refrigerator at the temperature of-40 DEG C for 80 minutes until the central temperature of the dough reaches-18 DEG C, and freezing the dough to obtain the frozen dough. The gel containing the sodium alginate and the deacylated antifreeze polypeptide-astragalus membranaceus polyphenol coupling agent is prepared, and the deacylated antifreeze polypeptide-astragalus membranaceus polyphenol coupling agent is added into the frozen dough, so that quality reduction caused by oxidation in the storage process of the frozen dough is reduced, and the rheological property of the frozen dough is remarkably improved; the gel is added into the frozen dough, so that the generation of ice crystals in the frozen dough is effectively inhibited, and the nutritive value of the dough is improved by adding the astragalus membranaceus polyphenols.

The invention discloses a preparation method of a high-barrier fresh-keeping film for food fresh-keeping packaging, belongs to the technical field of fresh-keeping film processing, and aims to solve the technical problem that the barrier property of a high-barrier fresh-keeping film to water vapor and oxygen and the tensile property of the high-barrier fresh-keeping film in the prior art need to be further improved. The preparation method comprises the following steps: adding barrier layer mixed particles, bonding layer mixed particles and a supporting layer material into a multi-layer co-extrusion extruder, carrying out melt extrusion, injecting into a multi-layer co-extrusion film machine, and carrying out blow molding to obtain the high-barrier-property preservative film which is compounded by five layers, namely a supporting layer, a bonding layer, a barrier layer, a bonding layer and a supporting layer from top to bottom, according to the invention, modified graphene is added into composite polyester of the barrier layer for modification, and waterborne polyurethane added with modified polysiloxane is prepared to obtain the bonding layer, so that the tensile property and the barrier property to water vapor and oxygen of the preservative film are further improved.

The invention relates to the field of food packaging, and provides a preparation method and application of an origanum vulgare essential oil-MOF modified alcohol-soluble protein preservative film. The preparation method comprises the following steps: mixing gamma-CD-MOF and origanum vulgare essential oil, reacting under a high-pressure reaction condition, centrifuging, washing and drying to obtain an origanum vulgare essential oil loaded MOF material; adding a plasticizer into the zein solution to prepare a membrane solution; and adding the MOF material loaded with the origanum vulgare essential oil into the film liquid, fully mixing, forming and drying to finally obtain the MOF-based food packaging film. According to the nano composite film disclosed by the invention, the water vapor barrier property, the ultraviolet barrier property and the oxidation resistance are remarkably improved. The nano composite film is applied to fresh-keeping experiments of strawberries and blueberries, so that the loss of nutritional ingredients is remarkably reduced, the shelf life of fruits is effectively prolonged, and an excellent fresh-keeping effect is shown. Compared with a traditional packaging material, the composite film provided by the invention not only is comprehensively optimized in performance, but also can provide more possibilities for a food fresh-keeping technology.

The invention belongs to the field of food packaging, and particularly relates to an efficient long-carbon-chain polyamide elastomer modified atmosphere preservative film as well as a preparation method and application thereof. The high-efficiency long-carbon-chain polyamide elastomer modified atmosphere preservative film is prepared from a raw material comprising a long-carbon-chain polyamide elastomer material, and the long-carbon-chain polyamide elastomer material is a segmented copolymer formed by alternately using long-carbon-chain polyamide as a hard segment and polyether as a soft segment. The preparation method of the long-carbon-chain polyamide elastomer modified atmosphere preservative film can adopt one of extrusion blow molding or two-way stretching. The film preparation method provided by the invention does not need a solvent, and the preparation process is simple and environment-friendly. The modified atmosphere preservative film disclosed by the invention has good modified atmosphere performance, controllable and adjustable CO2 permeability, CO2 / O2 separability and water vapor permeability, also has an ethylene gas removal function and good mechanical properties and thermal stability, and can meet the fresh-keeping requirements of fruits and vegetables with different respiratory action intensities.

The invention discloses reinforced zipper production equipment and a production process, and belongs to the technical field of zippers. The problems of size errors and material damage caused by a zipper tooth folding process in existing reinforced zipper production are solved. The equipment comprises an injection molding machine, a belt unwinding wheel, a belt winding wheel, a connecting wire and a mold, a connecting wire hole and a cavity are formed in the mold, the mold is divided into an upper mold and a lower mold, and the lower mold is provided with a loose core, an ejector pin, a positioning groove and a positioning partition plate; the injection molding machine adopts a micro-tension control technology to control the tension of the connecting line, and molten plastic is injected into a cavity, so that the connecting line is wrapped by the plastic to form zipper teeth once without folding. During production, continuous production is carried out through the steps of belt placing, mold closing injection molding, cooling demolding, conveying positioning, circulating mold closing and the like, and the consistency of zipper tooth pitches is guaranteed through the positioning grooves and the positioning partition plates. A folding process is replaced by one-time injection molding, so that size errors and material damage are avoided fundamentally, and the product quality and the production stability are improved.

A wrap container having a body including a front wall, a rear wall, a top wall, and a bottom wall forming an enclosure. A roll of wrap is disposed within the enclosure. The top wall has a perforated section. A folding surface has a top surface and a bottom surface with a cutter assembly including a track and a slidable cutter attached to the bottom surface of the folding surface. The cutter assembly has a first retracted position in the enclosure and a second deployed positon folded out of the opening.

The invention discloses a use of a polylactic acid active packaging film in the preservation of B. cerana. The polylactic acid active packaging film is prepared by using an Ag@MOF carrier to load a natural antibacterial agent, which is then fully mixed with polylactic acid and then melt-extrusion blow molding. The packaging film is used to package the B. cerana to achieve active packaging of the B. cerana, inhibit the growth of microorganisms, and extend the shelf life of the B. cerana. The preservation method has a simple process and is easy to operate. The materials used are biodegradable, reducing environmental pollution caused by packaging. The natural antibacterial agent, Litsea cubeba essential oil, is added to the preservative film, which can effectively inhibit the growth and reproduction of major spoilage bacteria isolated and identified from the B. cerana. The Ag@MOF is used to load the Litsea cubeba essential oil, which can effectively control the release rate of the Litsea cubeba essential oil, achieving long-lasting antibacterial and antioxidant purposes. The preservation method can effectively extend the storage period of the B. cerana.

The invention relates to the technical field of materials, and discloses a preservative film for food storage and a preparation method thereof.The preservative film is prepared by taking polylactic acid as a matrix and compounding an antibacterial modifier, a functional chain extender and other additives through mixing, extrusion and blow molding processes, the preservative film is endowed with excellent antibacterial performance, is non-toxic and harmless, and can guarantee food safety, the functional chain extender can realize chain extension connection of polylactic acid, polylactic acid is converted into a three-dimensional cross-linked structure from a straight-chain structure, the cross-linking density of a polylactic acid molecular chain is further improved, and the service life of the preservative film is prolonged. The movement of a polylactic acid molecular chain under a high-temperature condition is hindered, so that the heat resistance of the preservative film is improved. In addition, the POSS skeleton contains a large number of silicon-oxygen bonds with high bond energy, so that the heat resistance of the preservative film can be further improved.

The present invention discloses a method for preparing a hunting-type fruit and vegetable fresh-keeping material, comprising the following steps: (1) dispersing clay minerals in an organic solvent and stirring and mixing at high speed to obtain a clay mineral dispersion; (2) preparing carbon quantum dot-modified titanium dioxide nanosheets; (3) adding carbon quantum dot-modified titanium dioxide nanosheets to the clay mineral dispersion, and adding metal oxides, metal salts and dispersants and stirring and mixing at high speed, calcining, adding organic antibacterial agents, ball milling, and drying to obtain a dispersion. Also disclosed are a fruit and vegetable fresh-keeping material prepared by the above method, a hunting-type fruit and vegetable dormant fresh-keeping film prepared by the fruit and vegetable fresh-keeping material, and the use of the above fruit and vegetable fresh-keeping material and fresh-keeping film in fruit and vegetable preservation.

The invention relates to the technical field of polymer composite materials, in particular to a degradable PPC-based composite film as well as a preparation method and application thereof. The degradable PPC-based composite film is prepared from polypropylene carbonate, bamboo powder and vinyl trimethoxy silane. Polypropylene carbonate (PPC) is adopted as a base material, bamboo powder is combined for filling, the prepared composite film can be completely degraded after being buried in natural soil for 5 months, and degradation products of the composite film do not pollute the environment; the bamboo powder is adopted as a reinforcing filler, has a certain bacteriostatic effect, and can be used for delaying the growth of microorganisms on the surface of food and improving the food safety and the fresh-keeping effect if being applied to the food fresh-keeping film. Compared with a pure PPC film, the composite film disclosed by the invention is improved in the aspects of mechanical property, thermal stability and glass transition temperature, and shows more excellent comprehensive performance.

The invention discloses a chitosan-based preservative film with a pH colorimetric function as well as a preparation method and application of the chitosan-based preservative film. The chitosan-based preservative film is prepared from the following preparation raw materials: chitosan, cellulose nanofibers, a deep eutectic solvent and a beet red-zinc ion complex. Wherein the chitosan enables the film to have antibacterial property; the cellulose nanofiber can enhance the tensile strength and toughness and reduce the water vapor / oxygen permeation coefficient; the beet red-zinc ion complex has the characteristic of more stable color development, and the color difference response delta E to pH 2-12 is greater than or equal to 8. The chitosan-based preservative film disclosed by the invention can be applied to food fresh-keeping packaging and food freshness monitoring; the preservative film disclosed by the invention can be used for effectively prolonging the service life of fruits and vegetables while ensuring the food safety; in food freshness monitoring application, the preservative film changes from low-pH-value orange to high-pH-value yellow according to the change of acid-base conditions, and the preservative film can be used as a pH colorimetric sensing film for freshness monitoring.

The utility model relates to the technical field of blister boxes, and discloses a portable blister box which comprises a lower box body, an upper box cover and a lifting rope. A bending connecting plate is fixedly connected between the lower box body and the upper box cover, a connecting clamping groove is fixedly connected to the lower box body, a connecting buckle is fixedly connected to the upper box cover, and the connecting clamping groove and the connecting buckle are in interference fit with each other; edge lugs are fixedly connected to the two sides of the lower box body, fixing cylinders are fixedly connected into the edge lugs, hanging grooves are formed in the outer sides of the fixing cylinders, elastic buckle plates are installed in the hanging grooves, and the lifting ropes are arranged in the fixing cylinders. According to the plastic uptake box, a set of hanging grooves are additionally formed in the two sides of the plastic uptake box in the mode that the side lugs are installed on the two sides of the plastic uptake box, at the moment, a worker can twist the preservative film into the carrying rope, the carrying rope is knotted at the two ends of the carrying rope, and therefore the plastic uptake box is convenient to use. The carrying rope and the hanging groove are mutually assembled, so that the handle is additionally arranged on the blister box, and the blister box is convenient to carry by people.

The invention relates to the technical field of food fresh-keeping materials, and discloses a preparation method of an intelligent response degradable fruit and vegetable fresh-keeping film based on a Janus structure, the intelligent response degradable fruit and vegetable fresh-keeping film comprises a hydrophobic layer and a hydrophilic layer, the hydrophobic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid, and the hydrophilic layer is an electrostatic spinning film formed by compounding eugenol-loaded ZIF-8 nano-particles and polylactic acid. The hydrophilic layer is an electrostatic spinning membrane formed by compounding chitosan and gelatin, the surface of the hydrophobic layer is covered with the hydrophilic layer through an electrostatic spinning technology, the ZIF-8 nanoparticles are synthesized through a room-temperature stirring method, and synthesis raw materials are a 2-methylimidazole methanol solution and a zinc nitrate methanol solution. By means of the pH response characteristic of the ZIF-8 nano-particles, pH value change signals generated in the early stage of fruit and vegetable putrefaction can be sensitively captured, loaded antibacterial components are accurately released through ZIF-8 framework dissociation, targeted inhibition on putrefying bacteria is achieved, passive protection is converted into active intervention, the fruit and vegetable putrefaction process is effectively delayed, the fresh-keeping effect is improved, and the fresh-keeping time is prolonged.

The invention belongs to the technical field of degradable packaging materials, and discloses a preparation method of a degradable preservative film. The anti-fog antibacterial plastic is prepared from the following raw materials in parts by weight: 40 to 45 parts of poly (butylene adipate-co-terephthalate) (PBAT), 8 to 12 parts of polylactic acid (PLA), 28 to 32 parts of modified structural starch, 4 to 6 parts of poly (butylene carbonate) (PBC), 4 to 6 parts of talcum powder, 0.4 to 0.6 part of aluminate, 0.8 to 1.2 parts of a composite antibacterial agent and 2.5 to 3.5 parts of anti-fog master batch. The invention aims to overcome the defects in the prior art, and provides the degradable preservative film and the preparation method thereof, the preservative film not only has good degradability and mechanical properties, but also has excellent antibacterial and antifogging effects, and the preparation process is simple and easy for industrial production.

The invention discloses an algin composite membrane which is prepared by the following steps: adding 0.8-1.2 g of algin, 0.8-1.2 g of hydroxypropyl methyl cellulose, 0.8-1.2 mL of glycerol, 0.4-0.6 g of titanium dioxide and 0.8-1.2 g of polylysine into water, uniformly mixing, fixing the volume, putting into a container, drying, immersing into a CaCl2 solution for crosslinking treatment, and drying, thereby obtaining the algin composite membrane. The algin composite film can be used as or used for preparing a food preservative film. The algin composite film disclosed by the invention realizes good balance between strength and ductility, has good antioxidant capacity and remarkable antibacterial effect, and can effectively enhance the antioxidant defense capacity of the cape gooseberries, reduce oxidative damage, prolong the storage period and improve the fresh-keeping effect of the cape gooseberries. According to the method, the economic value of the sargassum is favorably improved, and powerful support is provided for sustainable development of the food industry.

The invention relates to the field of food preservation, and provides a preservative film as well as a preparation method and application thereof. The preparation method comprises the following steps: loading the fruit and vegetable preservative on a gamma-cyclodextrin-metal organic framework to obtain a composite material; mixing the composite material, a hydrophobic substance and a first solvent to obtain a first solution; mixing a hydrophilic substance with water to obtain a second solution; mixing the first solution and the second solution to obtain a film forming solution, and preparing the preservative film by adopting the film forming solution. According to the invention, the composite material is dispersed into the hydrophobic film base liquid and then mixed with the water-based film base liquid, and the hydrophobic base material can rapidly wrap the composite material into a spherical shape due to hydrophilic and hydrophobic effects, so that a barrier layer is formed to isolate moisture, and the composite material is protected. According to the prepared preservative film, a complete skeleton structure of the gamma-cyclodextrin-metal organic skeleton in the water-based film base solution is kept, and the gamma-cyclodextrin-metal organic skeleton can be uniformly dispersed in the preservative film.

The invention discloses a production process of an anti-fog, mildew-proof and antibacterial plastic preservative film, and relates to the technical field of high polymer material processing. The preparation method comprises the following steps: S1, preparing matrix resin; s2, compounding functional raw materials; s3.1, preparing an anti-fog melt; s3.2, preparing a raw material gradient distribution blending melt; s4, performing multi-layer co-extrusion film blowing molding; and S5, plasma surface modification. According to the production process of the anti-fogging, mildew-proof and antibacterial plastic preservative film, the technical contradiction that the anti-fogging performance and the antibacterial performance of a traditional preservative film are difficult to coexist is solved; no solvent is added in the whole process, and the highest safety standard of food contact materials is met; according to the five-layer co-extrusion film blowing unit disclosed by the invention, the air ring and the mold core can be conveniently and quickly mounted and dismounted, the maintenance operation is convenient, and the production efficiency and the product quality are favorably improved.

The invention belongs to the field of food fresh-keeping materials, and particularly relates to a deep-eutectic propolis extract and CS / DPE composite film, a preparation method thereof and application of the deep-eutectic propolis extract and CS / DPE composite film in fresh-keeping films. The preparation method of the deep-eutectic propolis extract comprises the following steps: propolis is subjected to extraction treatment by adopting a deep-eutectic mixed solution containing a deep-eutectic solvent and water, the deep-eutectic solvent is a mixture of betaine and levulinic acid, and the extraction condition is that the polyphenol content in the obtained extracting solution is 25 mg / g or above and the flavone content is 250 mg / g or above; the obtained extracting solution is the eutectic propolis extract. The preparation method of the food preservative film comprises the following steps: mixing a chitosan solution and the eutectic propolis extract, casting to form a film, standing, and drying to obtain the food preservative film. The eutectic propolis extract obtained by the method provided by the invention is rich in polyphenols and flavones, and the mechanical property of the chitosan-based preservative film can be improved and the preservation effect on foods can be prolonged when the eutectic propolis extract is added into the chitosan-based preservative film.

The invention discloses a preparation method and application of a biomass carbon dot chitosan-based preservative film. The preservative film is prepared by taking chitosan and tea polyphenol carbon dots as main raw materials and taking glycerol as a plasticizer as an auxiliary material through a solution casting method. The preparation method comprises the following specific steps: synthesizing tea polyphenol carbon dots through a hydrothermal method, dissolving chitosan in a 1% acetic acid aqueous solution, adding glycerol and the tea polyphenol carbon dots, uniformly stirring, ultrasonically defoaming, uniformly coating to form a film, and drying at 40 DEG C for 6 hours to obtain the preservative film. The preservative film has excellent antibacterial, antioxidant and moisturizing properties, can significantly prolong the preservation period of perishable food such as salmon, inhibit the growth of microorganisms and maintain the nutrition and taste of the food, is environment-friendly and degradable, and reduces the use of chemical preservatives. The preparation method is simple, low in cost, suitable for large-scale production and capable of being widely applied to fresh food packaging, and a green solution is provided for development of a food preservation technology.

The present invention relates to the field of cable processing technology, and more specifically, to a cable wire extrusion device for cable processing, which includes a processing table and a wire supply mechanism, wherein the wire supply mechanism is arranged on one side of the top surface of the processing table, a plastic coating mechanism is arranged on the top surface of the processing table, and the wire output end of the wire supply mechanism is connected to the wire introduction end of the plastic coating mechanism, a plastic coating mechanism is arranged at the end of the plastic coating mechanism, a wire guide mechanism is arranged on the top surface of the processing table to fit the wire output end of the plastic coating mechanism, and a wire winding mechanism is arranged on the side of the processing table away from the wire supply mechanism, wherein the wire guide mechanism includes a guide base, a movable stand, a wire plate and a wire wheel frame. The present invention extrude the wire body through the plastic coating mechanism, and through the multiple guidance and support of the wire wheel frame and the wire plate, it can prevent the cable from bending downward between the lead-out mechanism and the winding mechanism, and protect the cable from cracking the outer plastic layer due to excessive bending.

The invention discloses frozen dough added with stachyose and a preparation method of the frozen dough, and belongs to the technical field of food processing. The instant noodles are prepared from the following raw materials in parts by weight: 80-100 parts of medium gluten wheat flour, 0.8-1.2 parts of dried yeast, 40-60 parts of water and 0.5-2.0 parts of stachyose. The preparation method comprises the following steps: adding water into the dried yeast for activation, and mixing and stirring the activated dried yeast with the medium-gluten wheat flour; dissolving stachyose in water to obtain a solution, adding the solution into the mixture, and stirring until the dough is formed; standing and fermenting the dough, partitioning, kneading and shaping, packaging with a preservative film, and freezing and storing, so as to obtain the frozen dough added with stachyose. The stachyose is added into the dough, so that the quality deterioration of the dough caused by freezing treatment can be effectively improved. In addition, the stachyose is added, so that the blood sugar rising rate after flour products such as steamed buns are eaten can be reduced, and the pursuit of people for health is met.

The utility model relates to the technical field of labels, in particular to a label capable of avoiding color fading due to reaction with a plasticizer, a surface layer is separated from an object to be pasted by a zigzag support strip and a rectangular support strip, the distance between the surface layer and the object to be pasted is increased, and the possibility that information of the label reacts with the precipitated plasticizer is prevented. The content of the label is protected from fading due to erosion of the plasticizer; if the preservative film wraps the object with the label, the surface layer of the label is in direct contact with the preservative film, the third protection layer plays a first isolation role on the plasticizer in the preservative film, part of the free plasticizer penetrates through the third protection layer and then enters the second protection layer, and the second protection layer is made of paraffin oil. The thick paraffin oil absorbs and isolates most of the plasticizer, the free plasticizer is further reduced, a very small part of the plasticizer penetrates through the paraffin oil and then reaches the first protection layer to be blocked again, the plasticizer penetrating through the first protection layer is very small, the corrosion effect on the label is very small, and the label cannot fade due to the effect of the plasticizer.