CN115558183A - Preparation method of antibacterial food preservative film - Google Patents
Preparation method of antibacterial food preservative film Download PDFInfo
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- CN115558183A CN115558183A CN202211256858.5A CN202211256858A CN115558183A CN 115558183 A CN115558183 A CN 115558183A CN 202211256858 A CN202211256858 A CN 202211256858A CN 115558183 A CN115558183 A CN 115558183A
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 19
- 239000005452 food preservative Substances 0.000 title claims abstract description 19
- 235000019249 food preservative Nutrition 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000004698 Polyethylene Substances 0.000 claims abstract description 78
- -1 polyethylene Polymers 0.000 claims abstract description 77
- 229920000573 polyethylene Polymers 0.000 claims abstract description 74
- 239000003755 preservative agent Substances 0.000 claims abstract description 55
- 230000002335 preservative effect Effects 0.000 claims abstract description 55
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000005977 Ethylene Substances 0.000 claims abstract description 41
- 239000010779 crude oil Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 238000004806 packaging method and process Methods 0.000 claims abstract description 14
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 239000010936 titanium Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims description 27
- 229920002367 Polyisobutene Polymers 0.000 claims description 25
- 239000003242 anti bacterial agent Substances 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerol Natural products OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 15
- 239000004033 plastic Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- 238000005194 fractionation Methods 0.000 claims description 8
- 125000005456 glyceride group Chemical group 0.000 claims description 7
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 6
- 239000003623 enhancer Substances 0.000 claims description 5
- 238000010096 film blowing Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000010345 tape casting Methods 0.000 claims description 3
- 238000009835 boiling Methods 0.000 abstract description 10
- 238000004821 distillation Methods 0.000 abstract description 8
- 238000005243 fluidization Methods 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 2
- 239000000284 extract Substances 0.000 abstract 1
- 239000010408 film Substances 0.000 description 104
- 239000010409 thin film Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000561734 Celosia cristata Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000013307 optical fiber Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08J2423/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08J2423/22—Copolymers of isobutene; butyl rubber
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/015—Biocides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0058—Biocides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Nutrition Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Wrappers (AREA)
Abstract
The invention discloses a preparation method of an antibacterial food preservative film, which relates to the technical field of preparation of preservative films and comprises the following steps: the method comprises the following steps: purifying raw materials, namely extracting polyethylene serving as a main raw material of the preservative film from crude oil; step two: preparing a film, adding an additive into the refined polyethylene material for shaping; step three: and (5) rolling and packaging the shaped polyethylene preservative film. The invention extracts polyethylene which is a main raw material of a preservative film from crude oil through raw material purification in a step one, heats and distills the crude oil in a distillation tower, because the boiling points of components in the crude oil are greatly different, a large amount of low boiling point components are gasified preferentially to high boiling point components, separates ethylene from the crude oil through depression by a distillation method, then adds gaseous ethylene into a titanium catalyst, enables the gaseous ethylene to circulate on a fluidized bed reactor by high-speed ethylene to maintain the fluidization of a bed layer, and removes reaction heat generated by ethylene polymerization.
Description
Technical Field
The invention relates to the technical field of preparation of preservative films, in particular to a preparation method of an antibacterial food preservative film.
Background
The plastic wrap is a plastic packaging product, and is usually prepared by taking ethylene as a master batch through polymerization reaction, and the plastic wrap can be divided into three categories: the first is polyethylene, abbreviated as PE; the second is polyvinyl chloride, PVC for short; the third one is polyvinylidene chloride, PVDC for short, and is widely applied to the fields of microwave oven food heating, refrigerator food preservation, fresh and cooked food packaging and the like, and food packaging in the fields of family life, supermarket stores, hotels and restaurants and industrial production
The following problems exist in the prior art:
the existing antibacterial food preservative film has a low antibacterial effect, and the antibacterial agent has a little toxic or side effect and is easy to harm the health of people; meanwhile, the speed of extracting polyethylene and other raw materials is low in the existing preparation method of the antibacterial food preservative film, and the molecular structure of the extracted polyethylene is unstable; and the existing antibacterial food preservative film can not be well separated when in use, so that the separation is easy to cause the non-uniform fracture, and the food can not be well covered by the preservative film.
Disclosure of Invention
The invention provides a preparation method of an antibacterial food preservative film, which aims to solve the problems in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of an antibacterial food preservative film comprises the following steps:
the method comprises the following steps: purifying raw materials, namely extracting polyethylene serving as a main raw material of the preservative film from crude oil;
step two: preparing a film, namely adding an additive into the extracted polyethylene material for shaping;
step three: and (5) rolling and packaging the shaped polyethylene preservative film.
The technical scheme of the invention is further improved as follows: the first step comprises the following substeps:
crude oil fractionation, wherein crude oil is processed by heating, gasifying, splitting, condensing, and cooling the crude oil;
separating ethylene, wherein the ethylene is separated from the crude oil on the basis of crude oil fractionation;
ethylene is in a gaseous state, and the gaseous polymerization of the ethylene adopts a fluidized bed reactor, so that the ethylene is polymerized in the gaseous state;
adding a catalyst, wherein the catalyst adopted by the catalyst is a titanium catalyst;
removing the heat of polymerization, wherein the heat generated in the reaction of polymerizing the ethylene is removed in the reactor;
polyethylene is excluded, which discharges polymerized ethylene through the bottom of the reactor.
The technical scheme of the invention is further improved as follows: the second step comprises the following steps:
heating, namely heating the obtained polyethylene in a boiler to melt the polyethylene;
adding a tackifier, wherein the added enhancer is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
adding a tackifier, wherein the added tackifier is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
adding an antibacterial agent which is a food-grade plastic antibacterial agent with the addition ratio of 0.75-1%;
adding an antifogging agent, wherein the added antifogging agent is glycerol ester and contains 10-15% of glyceride of antifogging agent master batch;
extruding polyethylene, and extruding the polyethylene after the polyethylene is melted and proportioned from a smelting furnace;
molding, wherein the polyethylene is cooled more fully in a tape casting mode;
film blowing cooling, which is used for rapidly cooling the film;
and (3) storing, wherein the temperature for storing the film is set to be higher, so that the polyisobutylene molecules move faster and are separated out more quickly.
The technical scheme of the invention is further improved as follows: the third step comprises the following steps:
the film edge sealing is carried out, and the two sides of the film are cut by the film edge sealing;
performing surface sawtooth cutting, wherein the surface sawtooth cutting is performed on the surface of the film without cutting off the film;
winding, wherein the film is wound into a rod by winding;
cutting off the tail part of the film of the winding roller;
and packaging, wherein the cut film is packaged by packaging.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
1. the invention provides a preparation method of an antibacterial food preservative film, which comprises the steps of purifying raw materials, extracting polyethylene which is a main raw material of the preservative film from crude oil, heating and distilling the crude oil in a distillation tower, heating to ensure that low-boiling-point components are gasified in a large amount in preference to high-boiling-point components due to large difference of boiling points of the components in the crude oil, performing depression separation by a distillation method to separate ethylene from the crude oil, adding gaseous ethylene into a titanium catalyst, circulating the gaseous ethylene on a fluidized bed reactor by using high-speed ethylene to maintain the fluidization of a bed layer, removing reaction heat generated by ethylene polymerization reaction to ensure that the obtained polyethylene is more stable, and finally discharging the produced polyethylene from the bottom of the reactor.
2. The invention provides a preparation method of an antibacterial food preservative film, wherein a film is prepared through the second step, an additive is added into a refined polyethylene material for shaping to obtain an unprocessed preservative film, the polyethylene is heated and melted, then a colorless and transparent viscous liquid of polyisobutylene is added into the polyethylene and is incompatible with a polymer PE, after the preservative film is produced, the polyisobutylene migrates to the surface of the preservative film to generate viscosity, therefore, if the ideal viscosity is required to be obtained, the polyethylene is not enough, a tackifier is added to improve the surface of the preservative film, the surface of the polyethylene film is more bonded by adding the tackifier of the polyisobutylene, an antibacterial agent is added according to the proportion of 0.75-1%, the antibacterial agent adopts a food grade plastic antibacterial agent to prevent the composition of bacteria on the preservative film, the generation of color and odor on the surface of the preservative film is avoided, finally, a glycerol fatty aerosol and an antifogging agent containing 10-15% glyceride are added to ensure that the transparency of the preservative film is not influenced, the food sealed by the preservative film cannot be seen from the outside, the food is more easily extruded and the viscosity of the polyisobutylene is increased, and the preservative film is more easily cooled, and the viscosity of the preservative film is increased.
3. The invention provides a preparation method of an antibacterial food preservative film, which comprises the following steps of performing edge sealing on two sides of a thin film through a third step, cutting two sides of the thin film, performing edge sealing on two sides of the thin film through an edge sealing machine, flattening two sides of the thin film, performing sawtooth cutting on the surface of the thin film through a cutting machine in the edge sealing process, not cutting the thin film, and leaving a sawtooth-shaped knife edge on the surface of the thin film, so that when a user uses the preservative film, the preservative film can be better separated, then winding the preservative film through a winding machine, winding and winding the preservative film on a winding drum, when the film is fully wound, cutting off the preservative film which is not wound through another group of blades of the cutting machine, and then packaging the wound and cut preservative film, thereby storing and selling the preservative film.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram illustrating the sub-steps of step one of the present invention;
FIG. 3 is a schematic diagram illustrating the substeps of step two of the present invention;
FIG. 4 is a schematic diagram of the substeps of step three of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example 1
As shown in fig. 1 to 4, the present invention provides a method for preparing an antibacterial food preservative film, comprising the steps of:
the method comprises the following steps: purifying raw materials, namely extracting polyethylene serving as a main raw material of the preservative film from crude oil;
step two: preparing a film, namely adding an additive into the extracted polyethylene material for shaping;
step three: and (5) rolling and packaging the shaped polyethylene preservative film.
In this embodiment, raw material purification is performed through the first step, polyethylene, which is a main raw material of the preservative film, is extracted from crude oil, the extracted polyethylene is processed, the polyethylene is made into a food preservative film through the second step, and finally, the shaped polyethylene preservative film is rolled, packaged and packaged through the third step
Example 2
As shown in fig. 1 to 4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, step one comprises the sub-steps of:
s11, crude oil fractionation, wherein the crude oil fractionation is processed by heating, gasifying, shunting, condensing and cooling the crude oil;
s12, separating ethylene, wherein the ethylene is separated from the crude oil on the basis of crude oil fractionation;
s13, polymerizing ethylene in a gas state by adopting a fluidized bed reactor in the gas state of ethylene;
s14, adding a catalyst, wherein the catalyst used for adding the catalyst is a titanium catalyst;
s15, removing the heat of polymerization reaction, and removing the heat generated in the reaction of ethylene polymerization in the reactor;
s16 polyethylene is excluded and the polymerized ethylene is discharged through the bottom of the reactor.
In this example, the main raw material polyethylene of the plastic wrap is extracted from crude oil by purifying the raw material in the first step, the crude oil is heated and distilled in a distillation tower, because the boiling points of the components in the crude oil are different greatly, the low boiling point component is gasified in a large amount in preference to the high boiling point component by heating, the ethylene is separated from the crude oil by depression by the distillation method, the gaseous ethylene is added into a titanium catalyst, the gaseous ethylene is circulated on a fluidized bed reactor by using high-speed ethylene to maintain the fluidization of the bed layer, the reaction heat generated by the ethylene polymerization reaction is removed to make the obtained polyethylene more stable, and finally the produced polyethylene is discharged from the bottom of the reactor.
Example 3
As shown in fig. 1 to 4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, step two includes the steps of:
s21, heating, namely heating the obtained polyethylene in a boiler to melt the polyethylene;
s22, adding a tackifier, wherein the added enhancer is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
s22, adding a tackifier, wherein the added enhancer is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
s23, adding an antibacterial agent which is a food-grade plastic antibacterial agent in a proportion of 0.75-1%;
s24, adding an antifogging agent, wherein the added antifogging agent is glycerol ester and contains 10-15% of glyceride-containing antifogging agent master batch;
s25, extruding polyethylene, and extruding the polyethylene after the polyethylene is melted and proportioned from a smelting furnace;
s26, forming; the polyethylene is cooled more fully by the tape casting method;
s27, film blowing and cooling; film blowing cooling is carried out to rapidly cool the film;
s28, storing; the storing temperature of the film is set to be higher, so that the polyisobutylene molecules move faster and are separated out more quickly.
In the embodiment, the additive is added into the refined polyethylene material to be shaped to obtain an unprocessed preservative film, the polyethylene is heated to be melted, the polyisobutylene which is colorless and transparent viscous liquid is added into the polyethylene and is incompatible with the PE polymer, after the preservative film is produced, the polyisobutylene migrates to the surface of the preservative film and is separated out, so that the film generates viscosity, if the ideal viscosity is required to be obtained, the viscosity of the preservative film is improved only by the polyethylene, the viscosity of the preservative film is improved by adding the tackifier which is polyisobutylene, the surface of the polyethylene film is more bonded by adding the tackifier which is polyisobutylene according to the proportion of 0.75-1%, the antibacterial agent is a food-grade plastic antibacterial agent, the composition of bacteria on the preservative film is prevented, the generation of color and odor on the surface of the preservative film is avoided, finally, the glycerol fatty aerosol and the antifogging agent containing 10-15% glyceride are added, so that the transparency of the preservative film is not influenced, the food sealed by the preservative film cannot be seen from the outside, the preservative film is prevented from being generated, the polyethylene is extruded by an extruder, the masterbatch containing 10-15% of glyceride is added, the polyisobutylene is extruded by the cooling roller, the preservative film is more easily cooled, and the more high-average cooling temperature of the preservative film is increased, and the polyisobutylene is increased.
Example 4
As shown in fig. 1 to 4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, step three includes the steps of:
s31, edge sealing is carried out on the film, and the two sides of the film are cut by the edge sealing of the film;
s32, performing surface sawtooth cutting, namely performing sawtooth cutting on the surface of the film without cutting the film;
s33, winding, namely winding the film into a rod;
s34, cutting, namely cutting off the tail part of the film of the winding roller;
and S35, packaging, namely packaging the cut film.
In this embodiment, through the three film banding of step, the film both sides are tailor, carry out the bag sealer to the both sides of film through the bag sealer, let its both sides level and smooth, the in-process of banding, carry out the sawtooth cutting through the cutting machine to the surface of film earlier, do not cut off it, let the surface of its film leave the edge of a knife of cockscomb structure, can separate the plastic wrap better when the user uses like this, then carry out the rolling with the plastic wrap through the rolling machine, make the plastic wrap wind the rolling on the reel, when receiving full, another group's blade of cutting machine cuts off the plastic wrap of not rolling, then pack the plastic wrap after the rolling cutting is accomplished, thereby store and sell.
The working principle of the preparation method of the antibacterial food preservative film is described in detail below.
As shown in fig. 1-4, the raw material is purified by the first step, polyethylene which is the main raw material of the preservative film is extracted from crude oil, the crude oil is heated and distilled in a distillation tower, because the boiling points of the components in the crude oil are greatly different, the low boiling point component is gasified in a large amount in preference to the high boiling point component by heating, the ethylene is separated from the crude oil by depression by the distillation method, the ethylene in a gas state is separated, the ethylene in a gas state is added into a titanium type catalyst, the ethylene in a gas state is circulated on a fluidized bed reactor by high-speed ethylene to maintain the fluidization of a bed layer, the reaction heat generated by the ethylene polymerization reaction is removed to make the obtained polyethylene more stable, finally the produced polyethylene is discharged from the bottom of the reactor, the extracted polyethylene material is added with additives for shaping to obtain an unprocessed preservative film, the polyethylene is heated and melted, adding polyisobutylene which is colorless and transparent viscous liquid into polyethylene and incompatible with polymer PE, wherein after the preservative film is produced, polyisobutylene can migrate and separate out on the surface of the preservative film to enable the film to generate viscosity, so that if the ideal viscosity is required to be obtained, polyethylene is not enough, a tackifier is added to improve the viscosity of the preservative film, the surface of the polyethylene film is more cohesive by adding the polyisobutylene which is the tackifier, an antibacterial agent is added according to the proportion of 0.75-1%, the antibacterial agent adopts a food-grade plastic antibacterial agent to prevent the composition of bacteria on the preservative film, the generation of color and smell on the surface of the preservative film is avoided, and finally, a glycerol fatty aerosol and an antifogging agent master batch containing 10-15% glyceride are added to prevent the transparency of the preservative film from being influenced and prevent food sealed by the preservative film from being invisible from the outside, the method comprises the following steps of extruding polyethylene through an extruder, enabling the polyethylene to be cooled more fully under the action of a cooling roller, enabling polyisobutylene to be extracted more easily, enabling the viscosity of the preservative film to be better, storing the cooled film at a position higher than the average temperature, enabling polyisobutylene molecules to move faster as the storage temperature is higher, enabling the polyisobutylene molecules to separate out faster, improving the adhesion of the preservative film, sealing edges of the film in the third step, cutting two sides of the film, performing edge sealing on two sides of the film through an edge sealing machine, enabling the two sides of the film to be flat, performing sawtooth cutting on the surface of the film through a cutting machine in the edge sealing process, not cutting the surface of the film, and leaving a sawtooth-shaped knife edge on the surface of the film.
The present invention has been described in general terms, but it will be apparent to those skilled in the art that modifications and improvements can be made based on the present invention. Therefore, it is possible to modify or improve the optical characteristics of the optical fiber without departing from the spirit of the present invention.
Claims (4)
1. A preparation method of an antibacterial food preservative film is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: purifying raw materials, namely extracting polyethylene serving as a main raw material of the preservative film from crude oil;
step two: preparing a film, namely adding an additive into the extracted polyethylene material for shaping;
step three: and (5) rolling and packaging the shaped polyethylene preservative film.
2. The method for preparing an antibacterial food preservative film according to claim 1, characterized in that: the first step comprises the following substeps:
s11, crude oil fractionation, wherein the crude oil fractionation is processed by heating, gasifying, shunting, condensing and cooling the crude oil;
s12, separating ethylene, wherein the ethylene is separated from the crude oil on the basis of crude oil fractionation;
s13, polymerizing ethylene in a gas state by adopting a fluidized bed reactor in the ethylene gas state polymerization;
s14, adding a catalyst, wherein the catalyst used for adding the catalyst is a titanium catalyst;
s15, removing the heat of polymerization reaction, wherein the heat generated in the reaction of ethylene polymerization is removed in the reactor by the heat of polymerization reaction;
s16 polyethylene is removed, which discharges polymerized ethylene through the reactor bottom.
3. The method for preparing an antibacterial food preservative film according to claim 1, wherein the method comprises the following steps: the second step comprises the following steps:
s21, heating, namely heating the obtained polyethylene in a boiler to melt the polyethylene;
s22, adding a tackifier, wherein the added enhancer is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
s22, adding a tackifier, wherein the added enhancer is polyisobutylene, a colorless and transparent viscous liquid and incompatible with polyethylene;
s23, adding an antibacterial agent, wherein the antibacterial agent is a food-grade plastic antibacterial agent, and the adding proportion is 0.75-1%;
s24, adding an antifogging agent, wherein the added antifogging agent is glycerol ester and contains an antifogging agent master batch of 10-15% of glyceride;
s25, extruding polyethylene, and extruding the polyethylene after the polyethylene is melted and proportioned from a smelting furnace;
s26, forming; the polyethylene is cooled more fully by the tape casting method;
s27, film blowing and cooling; the film blowing cooling enables the film to be rapidly cooled;
s28, storing; the storage sets the temperature of the film storage higher, allowing the polyisobutylene molecules to move faster and to precipitate faster.
4. The method for preparing an antibacterial food preservative film according to claim 3, wherein the method comprises the following steps: the third step comprises the following steps:
s31, edge sealing is carried out on the film, and the two sides of the film are cut by the edge sealing of the film;
s32, performing surface sawtooth cutting, wherein the surface sawtooth cutting is performed on the surface of the film without cutting the film;
s33, winding, namely winding the film into a rod;
s34, cutting off the tail part of the film of the winding roller;
s35, packaging, and packaging the cut film.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824177A (en) * | 2010-03-09 | 2010-09-08 | 陈迦乐 | Specific antibacterial PE (polyethylene) preservative film |
| CN103737910A (en) * | 2013-11-27 | 2014-04-23 | 苏州市丰盛塑业有限公司 | Antibacterial cooked food fresh-keeping film preparation method |
| CN105566728A (en) * | 2016-03-04 | 2016-05-11 | 江苏红贵纺实业有限公司 | Preservative film with antibacterial function and preparation method thereof |
| CN109776825A (en) * | 2018-12-28 | 2019-05-21 | 桐城市祥泰塑业有限公司 | A kind of preparation method for the PE film that fresh-keeping effect is excellent |
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- 2022-10-14 CN CN202211256858.5A patent/CN115558183A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824177A (en) * | 2010-03-09 | 2010-09-08 | 陈迦乐 | Specific antibacterial PE (polyethylene) preservative film |
| CN103737910A (en) * | 2013-11-27 | 2014-04-23 | 苏州市丰盛塑业有限公司 | Antibacterial cooked food fresh-keeping film preparation method |
| CN105566728A (en) * | 2016-03-04 | 2016-05-11 | 江苏红贵纺实业有限公司 | Preservative film with antibacterial function and preparation method thereof |
| CN109776825A (en) * | 2018-12-28 | 2019-05-21 | 桐城市祥泰塑业有限公司 | A kind of preparation method for the PE film that fresh-keeping effect is excellent |
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Application publication date: 20230103 |