CN112477210B - Preparation and preservation method of longan preservative film - Google Patents
Preparation and preservation method of longan preservative film Download PDFInfo
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- CN112477210B CN112477210B CN202011381633.3A CN202011381633A CN112477210B CN 112477210 B CN112477210 B CN 112477210B CN 202011381633 A CN202011381633 A CN 202011381633A CN 112477210 B CN112477210 B CN 112477210B
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- preservative film
- roller
- longan
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- spraying
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- 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
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Zoology (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a preparation method of a longan preservative film, which comprises the following steps: weighing; forming a preservative film; stretching the preservative film; performing corona treatment on the lower surface of the preservative film; spraying the anti-fog particles on the lower surface of the preservative film after corona treatment, and enabling the anti-fog particles to be embedded with the preservative film to form an anti-fog layer; hot pressing; drying; rolling; and (6) inspecting, packaging and transporting. The method can carry out corona treatment on the surface of the preservative film and spray anti-fog particles, so that a firm anti-fog layer is formed on the surface of the preservative film, and the anti-fog effect of the preservative film is improved. The invention also discloses a fresh-keeping method, the antifogging layer of the fresh-keeping film is wrapped on the mouth of the bowl, so that water molecules in the bowl are diffused on the surface of the antifogging layer to form a transparent water film, thereby playing the antifogging role.
Description
Technical Field
The invention relates to the technical field of preservative films, in particular to a preparation and preservation method of a longan preservative film.
Background
Longan is native to southern China, and the economic use of longan is mainly used as fruit, and because the aril is rich in vitamins and phosphorus, the longan has the functions of tonifying spleen and strengthening brain. The moisture of fresh longan is more than 80%, and current plastic wrap is when fresh longan pulp, because the pulp moisture of longan pulp is more, can give out a large amount of moisture, and steam can condense into the drop of water at the internal surface of plastic wrap after the condensation, very big influence the luminousness in the wrapping bag, make the condition inside of the observation that people can't be clear, and the drop of water also can be to the production harm of longan, and the shell of longan is more crude, often breaks the plastic wrap easily.
In view of the above, the applicant has made an intensive study to solve the above problems and has made the present invention.
Disclosure of Invention
The invention aims to provide a preparation method of a longan preservative film, which can carry out corona treatment on the surface of the preservative film and spray antifogging particles, so that a firm antifogging layer is formed on the surface of the preservative film, and the antifogging effect of the preservative film is improved.
The invention also aims to provide a preservation method, which is convenient for observing the preservation condition of the longan in the bowl and improves the preservation effect.
In order to achieve the above purpose, the solution of the invention is:
a preparation method of a longan preservative film comprises the following steps:
(1) weighing manufacturing raw materials, wherein the manufacturing raw materials are PVDC materials;
(2) forming a preservative film;
(3) stretching the preservative film;
(4) performing corona treatment on the lower surface of the preservative film;
(5) spraying the anti-fog particles on the lower surface of the preservative film after corona treatment, and enabling the anti-fog particles to be embedded with the preservative film to form an anti-fog layer;
(6) carrying out hot-pressing treatment on the preservative film;
(7) drying the preservative film;
(8) rolling the dried preservative film;
(9) and inspecting, packaging and transporting the rolled preservative film.
Further, the heating temperature of the raw material prepared in the step (2) is 120-140 ℃.
Further, adopt spraying device and forming roll to carry out spray forming to the plastic wrap in step (2), spraying device sets up the top at the forming roll, spraying device's below is equipped with the spraying mouth, the axis direction extension setting of forming roll is followed to the spraying mouth.
Further, adopt corona unit to carry out corona treatment to the plastic wrap in step (4), corona unit has the corona groove that supplies the plastic wrap to get into, corona groove has feed inlet and discharge gate, corona groove's lower extreme has carries out the discharge portion that discharges to the plastic wrap.
Further, the discharge part is arranged in parallel with the preservative film.
Furthermore, the first parallel roller outside the feed inlet, the second parallel roller outside the discharge gate, first parallel roller and second parallel roller are parallel to each other the setting.
Further, in the step (5), the anti-fog particles are sprayed on the lower surface of the preservative film through a spraying device, the spraying device is provided with a spraying opening, and the spraying direction of the spraying opening is perpendicular to the conveying direction of the preservative film.
Further, in the step (6), the preservative film is hot-pressed through an electric heating roller set, the electric heating roller set comprises a first electric heating roller and a second electric heating roller which are arranged in parallel, the outer circumferential surface of the first electric heating roller is attached to the lower surface of the preservative film, and the outer circumferential surface of the second electric heating roller is attached to the upper surface of the preservative film.
Further, in the step (7), a drying device is adopted to dry the preservative film, the drying device is arranged above the preservative film, and a drying air port facing the preservative film is formed in the lower end of the drying device.
Furthermore, a third parallel roller is arranged on the side edge of the drying air opening, and the third parallel roller and the second electric heating roller are horizontally arranged in parallel.
After the method is adopted, the invention relates to a preparation method of a longan preservative film, the preservative film is made of PVDC material, the strength is higher, and the preservative film is not easy to be worn by the shell of longan. And the preservative film is subjected to corona treatment, and various ions generated after air ionization accelerate and impact the surface of the preservative film under the action of a strong electric field. The chemical bonds of the raw material molecules in the preservative film are broken and degraded, and the surface roughness and the surface area are increased. During discharging, a large amount of ozone is generated, and the ozone is a strong oxidant and can oxidize raw material molecules to generate groups with stronger polarity, such as carbonyl, peroxide and the like, so that the surface energy of the raw material molecules is improved. Then, the antifogging particles are sprayed on the rough outer surface of the preservative film, so that an antifogging layer is formed. Compared with the prior art, the surface of the preservative film provided by the invention is provided with the antifogging layer, so that water vapor can be adsorbed, fogging is prevented, and a user can conveniently observe the freshness of longan pulp in a bowl. In addition, the antifogging particles are embedded on the surface of the preservative film to form an antifogging layer, so that the antifogging layer is firmly connected with the preservative film and is not easy to fall off, and the antifogging time efficiency is greatly improved.
A fresh-keeping method based on the preparation method of the longan fresh-keeping film is characterized in that an anti-fog layer of the fresh-keeping film is wrapped on the mouth of a bowl downwards.
By adopting the method, the invention also relates to a fresh-keeping method, the anti-fog layer of the fresh-keeping film is wrapped on the bowl mouth of the toy downwards, compared with the prior art, the anti-fog layer utilizes the special molecular structure of the surface activity of the anti-fog particles, one part of the anti-fog layer is hydrophilic groups, the other part of the anti-fog layer is oleophylic groups, the hydrophilic groups adsorb water molecules in the air and reduce the surface tension of the water molecules, thereby reducing the contact angle between the water molecules and the surface of a transparent object, leading the water molecules to be wetted and diffused on the surface of the fresh-keeping film before water beads are formed, forming an ultra-thin transparent water film, not generating scattering effect on incident light and not generating interference on sight lines, thereby playing the role of fog prevention. The preservative film has a better anti-fog function while having a preservation effect. And the antifogging layer is firmly connected with the preservative film and is not easy to fall off, so that the antifogging time efficiency is greatly improved. In addition, the water drops can not be solidified and dropped, thereby improving the fresh-keeping time efficiency of the longan pulp.
Drawings
FIG. 1 is a schematic process flow diagram of the preparation method of the present invention.
FIG. 2 is a schematic view of the structure of an apparatus used in the production method of the present invention.
FIG. 3 is a schematic structural view of the plastic wrap engaged with the anti-fog particles before hot pressing.
FIG. 4 is a schematic structural diagram of the plastic wrap after hot pressing and the anti-fog particles.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1 to 4, a preparation method of a longan preservative film comprises the following steps:
(1) weighing the raw materials for manufacturing the preservative film 8, wherein the raw materials for manufacturing the preservative film are PVDC materials and are added into the spraying device 1;
(2) the spraying device 1 heats and melts the preparation raw materials into raw material emulsion, and the raw material emulsion is uniformly sprayed on the forming roller 2 through a nozzle to form a preservative film 8;
(3) stretching the preservative film 8 through a traction roller and a tension roller;
(4) performing corona treatment on the lower surface of the preservative film 8;
(5) spraying the anti-fog particles 81 on the lower surface of the preservative film 8 after corona treatment, and enabling the anti-fog particles 81 to be embedded with the preservative film 8 to form an anti-fog layer;
(6) carrying out hot-pressing treatment on the preservative film 8;
(7) drying the preservative film 8;
(8) conveying the dried preservative film 8 to a winding roller 9 for winding;
(9) and inspecting, packaging and transporting the rolled preservative film 8.
After the method is adopted, the invention relates to a preparation method of a longan preservative film 8, which is characterized in that the preservative film 8 is subjected to corona treatment, and various ions generated after air ionization accelerate and impact the surface of the preservative film 8 under the action of a strong electric field. The chemical bonds of the raw material molecules in the preservative film 8 are broken and degraded, and the surface roughness and the surface area are increased. During discharging, a large amount of ozone is generated, and the ozone is a strong oxidant and can oxidize raw material molecules to generate groups with stronger polarity, such as carbonyl, peroxide and the like, so that the surface energy of the raw material molecules is improved. Then, the antifogging particles 81 are sprayed on the rough outer surface of the preservative film 8, thereby forming an antifogging layer. Compared with the prior art, the surface of the preservative film 8 provided by the invention is provided with the antifogging layer, so that water vapor can be adsorbed, fogging is prevented, and a user can conveniently observe the fresh-keeping condition of longan pulp in the bowl. In addition, the antifogging particles 81 are embedded on the surface of the preservative film 8 to form an antifogging layer, so that the antifogging layer is firmly connected with the preservative film 8 and is not easy to fall off, and the antifogging timeliness is greatly improved.
Preferably, the heating temperature of the raw material prepared in the step (2) is 120-140 ℃.
Preferably, adopt spraying device 1 and forming roll 2 to carry out spray forming to plastic wrap 8 in step (2), spraying device 1 sets up in forming roll 2's top, spraying device 1's below is equipped with the spraying mouth, the spraying mouth extends the setting along forming roll 2's axis direction, during operation, the spraying mouth forms plastic wrap 8 with the even spraying of fused raw materials on forming roll 2's outer periphery along forming roll 2's axis direction, make the plastic wrap 8 that makes more level and more even and thickness.
Preferably, adopt corona unit 3 to carry out corona treatment to plastic wrap 8 in step (4), corona unit 3 has the corona groove 31 that supplies plastic wrap 8 to get into, and corona groove 31 has feed inlet and discharge gate, and the lower extreme of corona groove 31 has the portion 32 that discharges to plastic wrap 8. After adopting above-mentioned structure, discharge portion 32 discharges to the lower surface of plastic wrap 8 to the air between discharge portion 32 and the plastic wrap 8 lower surface carries out the ionization, and various ions that produce after the air ionization are under the effect of strong electric field, accelerate and strike the surface of plastic wrap 8. The chemical bonds of the raw material molecules in the preservative film 8 are broken and degraded, and the surface roughness and the surface area are increased. During discharging, a large amount of ozone is generated, and the ozone is a strong oxidant and can oxidize raw material molecules to generate groups with stronger polarity, such as carbonyl, peroxide and the like, so that the surface energy of the raw material molecules is improved.
Preferably, the discharge part 32 is disposed parallel to the plastic wrap 8. By adopting the structure, the distances between each part of the discharge part 32 and the lower surface of the preservative film 8 are equal, so that the corona effect of the lower surface of the preservative film 8 is more uniform.
Preferably, the first parallel roller 41 outside the feed opening, the second parallel roller 42 outside the discharge opening, and the first parallel roller 41 and the second parallel roller 42 are arranged in parallel with each other. By adopting the structure, the tension of the preservative film 8 in the corona groove 31 is adjusted by the first parallel roller 41 and the second parallel roller 42, so that the surface of the preservative film can be flatly extended, and the corona effect is more uniform. In addition, can also guarantee that the plastic wrap 8 is in the surface that various ions that produce behind the horizontal state air ionization can strike plastic wrap 8 perpendicularly in corona groove 31, further promote corona unit 3 to the corona effect of plastic wrap 8.
Preferably, the anti-fog particles 81 are sprayed on the lower surface of the preservative film 8 through the spraying device 5 in the step (5), the anti-fog particles 81 can be xanthan gum particles, harm to human health can not be caused, and an anti-fog function is achieved. The spraying device 5 has a spraying opening 51, and the spraying direction of the spraying opening 51 is perpendicular to the conveying direction of the preservative film 8. With this structure, the anti-fog particles 81 can vertically strike and embed into the surface of the preservative film 8, so that the anti-fog particles 81 are more uniformly and firmly attached.
Preferably, in the step (6), the plastic wrap 8 is hot-pressed by an electric heating roller set, the electric heating roller set comprises a first electric heating roller 61 and a second electric heating roller 62 which are arranged in parallel, the outer circumferential surface of the first electric heating roller 61 is attached to the lower surface of the plastic wrap 8, and the outer circumferential surface of the second electric heating roller 62 is attached to the upper surface of the plastic wrap 8. Adopt this structure, as shown in the figure 3-4, first electric heat roller 61 and second electric heat roller 62 can heat the compression roller to the surface of plastic wrap 8, through to 8 surface heating of plastic wrap, make the surface of plastic wrap 8 softer, later rethread first electric heat roller 61 and second electric heat roller 62 cooperate compression roller plastic wrap 8 each other, the lower surface of plastic wrap 8 is the horizontality by original coarse state compression roller, make plastic wrap 8 can wrap up and fix anti-fog particle 81 better, it is more firm to make anti-fog particle 81 gomphosis, thereby avoid the anti-fog layer to drop, further improve the anti-fog ageing of anti-fog layer.
Preferably, in the step (7), the preservative film 8 is dried by using the drying device 7, the drying device 7 is arranged above the preservative film 8, and the lower end of the drying device 7 is provided with a drying air port 71 facing the preservative film 8. Drying device 7 dries plastic wrap 8, gets rid of the moisture, later carries out the rolling with plastic wrap 8 again. Water molecules in the air are prevented from being attached to the anti-fog layer, so that the surface of the anti-fog layer is kept dry, and the product quality is improved.
Preferably, a third parallel roller 43 is provided at a side of the drying air opening 71, and the third parallel roller 43 is horizontally arranged in parallel with the second electric heating roller 62. By adopting the structure, the preservative film 8 is kept in a horizontal state at the lower end of the drying air opening 71, so that the preservative film 8 is dried more uniformly, and the product quality is further improved.
A fresh-keeping method based on the preparation method of the longan fresh-keeping film is characterized in that an anti-fog layer of the fresh-keeping film 8 is wrapped on the mouth of a bowl downwards.
By adopting the method, the invention also relates to a fresh-keeping method, and the anti-fog layer of the fresh-keeping film 8 is wrapped on the bowl mouth of the toy downwards. Compared with the prior art, the antifogging layer utilizes the special molecular structure of antifogging particle 81 surface activity, one part is hydrophilic group, one part is oleophylic group, hydrophilic group adsorbs the hydrone in the air and makes its surface tension reduce, thereby reduce the contact angle of hydrone and transparent object surface, before making the hydrone not form the drop, will moisten, spread on the surface of plastic wrap 8, form one deck ultra-thin transparent water film, no longer produce the scattering effect to the light of incidenting, also do not produce the interference to the line of sight, thereby play antifogging effect. So that the preservative film 8 has better antifogging function while having a preservation effect. And the antifogging layer is firmly connected with the preservative film 8 and is not easy to fall off, so that the antifogging time efficiency is greatly improved. In addition, the water drops can not be solidified and dropped, thereby improving the fresh-keeping time efficiency of the longan pulp.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (10)
1. The preparation method of the longan preservative film is characterized by comprising the following steps:
(1) weighing manufacturing raw materials, wherein the manufacturing raw materials adopt PVDC materials;
(2) forming a preservative film;
(3) stretching the preservative film;
(4) performing corona treatment on the lower surface of the preservative film;
(5) spraying the anti-fog particles on the lower surface of the preservative film after corona treatment, and enabling the anti-fog particles to be embedded with the preservative film to form an anti-fog layer;
(6) carrying out hot-pressing treatment on the surface of the preservative film;
(7) drying the preservative film;
(8) rolling the dried preservative film;
(9) inspecting, packaging and transporting the rolled preservative film;
carry out the hot pressing through electric heat roller group to the plastic wrap in step (6), the electric heat roller group includes first electric heat roller of parallel arrangement and second electric heat roller, the outer periphery of first electric heat roller and the lower surface laminating of plastic wrap, the outer periphery of second electric heat roller and the upper surface laminating of plastic wrap mutually support the compression roller plastic wrap through first electric heat roller and second electric heat roller, and the lower surface of plastic wrap is the temper grade by original coarse state compression roller for the plastic wrap can better parcel and fixed antifog particle.
2. The method for preparing longan preservative film as claimed in claim 1, wherein the heating temperature of the raw materials is 120-140 ℃.
3. The method for preparing the longan preservative film according to claim 1, wherein in the step (2), the preservative film is spray-molded by using a spraying device and a molding roller, the spraying device is arranged above the molding roller, a spraying nozzle is arranged below the spraying device, and the spraying nozzle extends along the axial direction of the molding roller.
4. The method for preparing the longan preservative film according to claim 1, wherein the preservative film is subjected to corona treatment by a corona device in the step (4), the corona device is provided with a corona groove for the preservative film to enter, the corona groove is provided with a feeding hole and a discharging hole, and the lower end of the corona groove is provided with a discharging part for discharging the preservative film.
5. The method for preparing the longan preservative film as claimed in claim 4, wherein the discharge part is arranged in parallel with the preservative film.
6. The method according to claim 4, wherein the first parallel roller is disposed outside the feeding hole, the second parallel roller is disposed outside the discharging hole, and the first parallel roller and the second parallel roller are disposed in parallel.
7. The method according to claim 1, wherein the anti-fog particles are sprayed on the lower surface of the preservative film by a spraying device in step (5), the spraying device is provided with a spraying opening, and the spraying direction of the spraying opening is perpendicular to the conveying direction of the preservative film.
8. The method according to claim 1, wherein in the step (7), the preservative film is dried by a drying device, the drying device is arranged above the preservative film, and the lower end of the drying device is provided with a drying air opening facing the preservative film.
9. The method for preparing longan preservative film according to claim 8, wherein a third parallel roller is arranged at the side of the drying air opening, and the third parallel roller and the second electric heating roller are horizontally arranged in parallel.
10. A preservative method based on the preparation method of the longan preservative film according to any one of claims 1 to 9, characterized in that the antifogging layer of the preservative film is wrapped downwards on the mouth of a bowl.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011381633.3A CN112477210B (en) | 2020-12-01 | 2020-12-01 | Preparation and preservation method of longan preservative film |
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| CN202011381633.3A CN112477210B (en) | 2020-12-01 | 2020-12-01 | Preparation and preservation method of longan preservative film |
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| CN112477210B true CN112477210B (en) | 2022-09-06 |
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| JP2001277420A (en) * | 2000-03-31 | 2001-10-09 | Dainippon Printing Co Ltd | Transparent gas barrier film |
| CN101239504A (en) * | 2007-02-07 | 2008-08-13 | 国家农产品保鲜工程技术研究中心（天津） | Micropore plastic wrap and preparation thereof |
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| US8900498B2 (en) * | 2001-10-12 | 2014-12-02 | Monosol Rx, Llc | Process for manufacturing a resulting multi-layer pharmaceutical film |
| JP5409463B2 (en) * | 2010-03-19 | 2014-02-05 | シーアイ化成株式会社 | Production method and production apparatus for polyolefin resin film for agriculture |
| CN102166869A (en) * | 2011-01-07 | 2011-08-31 | 安徽省宁国双津(集团)实业有限公司 | Fruit and vegetable preservative film and preparation method thereof |
| KR102390734B1 (en) * | 2014-09-08 | 2022-04-26 | 덴카 주식회사 | Biaxially stretched sheet and container for packaging |
| CN204936244U (en) * | 2015-08-11 | 2016-01-06 | 华南理工大学 | A kind of optical film shaping device |
| JP7280826B2 (en) * | 2017-01-11 | 2023-05-24 | ボスティック，インコーポレイテッド | Extrudable anti-fog copolyester heat seal resin |
| CN110257009A (en) * | 2019-07-15 | 2019-09-20 | 浙江跃维新材料科技有限公司 | A kind of antifoggant and application method |
| CN211074419U (en) * | 2019-09-21 | 2020-07-24 | 河南奥尼斯帝新材料有限公司 | Full-automatic preservative film production code spraying system |
| CN111300940A (en) * | 2019-10-31 | 2020-06-19 | 福建师范大学福清分校 | High-low temperature antifogging breathable polyolefin heat-sealing film for fruit and vegetable packaging and preparation method thereof |
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- 2020-12-01 CN CN202011381633.3A patent/CN112477210B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001277420A (en) * | 2000-03-31 | 2001-10-09 | Dainippon Printing Co Ltd | Transparent gas barrier film |
| CN101239504A (en) * | 2007-02-07 | 2008-08-13 | 国家农产品保鲜工程技术研究中心（天津） | Micropore plastic wrap and preparation thereof |
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