CN113276424B - Environment-friendly food preservation card forming system and preparation method - Google Patents

Environment-friendly food preservation card forming system and preparation method Download PDF

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Publication number
CN113276424B
CN113276424B CN202110307818.8A CN202110307818A CN113276424B CN 113276424 B CN113276424 B CN 113276424B CN 202110307818 A CN202110307818 A CN 202110307818A CN 113276424 B CN113276424 B CN 113276424B
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base cloth
cloth layer
parts
pressing
layer
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CN113276424A (en
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薛从福
卢灯荣
沈文辉
戴文智
何承政
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Fujian Jixian Biotechnology Co ltd
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Fujian Jixian Biotechnology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/486—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by their physical form being non-liquid, e.g. in the form of granules or powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/026—Chemical pre-treatments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0044—Stabilisers, e.g. against oxydation, light or heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/002—Panels; Plates; Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Abstract

The invention discloses an environment-friendly food preservation card forming system and a preparation method, belongs to the technical field of food preservation, and comprises an adhesion device, wherein the adhesion device comprises a feeding roller set, a pressing workbench and a pressing component, the feeding roller set comprises a first feeding roller set for conveying an upper second base cloth layer, a second feeding roller set for conveying a middle first base cloth layer and a third feeding roller set for conveying a lower second base cloth layer, the feeding roller set is arranged at the inlet position of the pressing workbench, the pressing component is positioned right above the pressing workbench, and the pressing component is welded by ultrasonic hot pressing. The invention has the beneficial effects that: through ultrasonic wave hot pressing butt fusion, not only can reduce compound cost, can keep the inside spatial structure of first base cloth layer and second base cloth layer not destroyed moreover to the greatest extent.

Description

Environment-friendly food preservation card forming system and preparation method
Technical Field
The invention relates to the technical field of food preservation, in particular to an environment-friendly food preservation card forming system and a preparation method thereof.
Background
Food spoilage is the most prominent problem in food quality and safety, and brings huge economic loss to the world every year. The key factor causing food spoilage is the growth and metabolism of microorganisms, and the essence of the growth and metabolism is that nutritional ingredients such as protein, carbohydrate, fat and the like in food are decomposed by degrading enzymes secreted by the microorganisms, for example, protein decomposition products comprise substances which are repugnant to human beings after smelling, such as amines, hydrogen sulfide, mercaptan, indole, skatole and the like; fatty rancidity produces aldehydes, ketones, etc., and further decomposes to produce a special rancid taste. In addition, the sensory and sanitary quality of the food is seriously affected by the ulceration of the texture of the food, mucus dirt and the like, and the use value is reduced or lost. The food spoilage not only reduces the nutritive value of the food and causes people to have aversion to the taste, but also can generate various toxic and harmful substances to cause acute poisoning or chronic poisoning of eaters, and in order to achieve the purposes of food preservation, fresh keeping and prolonging the shelf life and shelf life of the food, people adopt various fresh keeping technologies such as refrigeration, irradiation and the like, but the more convenient and economic technology is a method of adopting a deoxidizer or a fresh keeping card for preservation, for example, chinese patent CN103653185A discloses a moisture-proof deoxidizer for the food, which consists of 90-110 parts of iron powder, 5-15 parts of calcium chloride, 5-15 parts of activated carbon and 20-40 parts of auxiliary materials; wherein the auxiliary materials are attapulgite and montmorillonite with the mass ratio of 4-6:4-6. Although the moisture-proof deoxidizer can maintain the deoxidizing performance under high humidity conditions and is not easy to reverse water, when a packaging bag of the deoxidizer is broken, food is easy to pollute and cannot be eaten, and the deoxidizer is hard particles and is easy to collide with food during transportation to damage the appearance of the food.
Still like chinese patent CN107215044a discloses an alcohol tablet food preservation card and manufacturing method, including making into lamellar card body, the card body includes first membrane material layer, substrate layer and second membrane material layer, and the substrate layer is made for the cloth base material that has the alcohol, and first membrane material layer links firmly on the bottom surface of substrate layer through the adhesive, and second membrane material layer links firmly on the top surface of substrate layer through the adhesive. Although the mildew-proof preservative has a good mildew-proof effect, does not pollute food, and can effectively avoid the damage to the food appearance caused by the collision with the food in the transportation process, the preservative has the problems of reduced preservation effect under the humidity condition and the like.
Disclosure of Invention
The invention discloses an environment-friendly food fresh-keeping card forming system and a preparation method thereof, aiming at the problems that the fresh-keeping effect under the humidity condition cannot be well treated and food is easy to be polluted by fresh-keeping materials and cannot be eaten, and the like in the prior art.
Through ultrasonic wave hot pressing butt fusion, not only can reduce compound cost, can keep the inside spatial structure of first base cloth layer and second base cloth layer not destroyed moreover to the greatest extent.
Preferably, the pushing assembly comprises a pushing plate, a pushing support rod, a pushing driving assembly and an ultrasonic generator, wherein the pushing driving assembly and the ultrasonic generator are used for controlling the pushing support rod to push downwards, the pushing support rod is installed on the pushing driving assembly, the pushing plate is fixedly installed at the lower end part of the pushing support rod, and the ultrasonic generator is installed on the pushing support rod. The outer surface of the pressing support rod is also provided with a slide rail used for guiding the pressing support rod to slide up and down.
Preferably, the pressing driving assembly comprises a driving motor, a driven wheel and a cam, the driving motor drives the driven wheel to rotate, the central shaft of the driven wheel is coaxial with the rotating shaft of the cam, and the cam abuts against the upper end of the pressing supporting rod.
Preferably, a driving wheel is installed on the rotating shaft of the driving motor, and the driving wheel and the driven wheel are in transmission through a belt.
Preferably, the lower surface of the lower laminating plate is distributed with laminating pattern welding joints for ultrasonic laminating.
Preferably, the laminate pattern-weld joints are in a matrix sequence, and each pattern unit in the matrix sequence is in one of a circle, a rectangle or an oval.
Preferably, a limiting plate assembly for limiting the thickness of the adhered composite sheet is mounted behind the pressing assembly.
Preferably, a limiting wheel set for controlling the distance between the composite front base cloth is arranged in front of the pressing component.
Preferably, a rolling assembly for secondarily compressing the composite sheet is installed behind the limiting plate assembly.
Preferably, the cutting device is used for cutting the adhered sheets.
The invention also provides a preparation method of the environment-friendly food preservation card, which comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 30-40wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of a second deoxidizer in the second base cloth layer to be 30-40wt%;
adhering low-melting-point particles to the upper surface and the lower surface of the first base cloth layer, and then enabling the first base cloth layer and the second base cloth layer to pass through an adhering device, so that the second base cloth layer is adhered to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
Preferably, the ultrasonic hot-pressing time in the second step is controlled to be 0.2-0.5s, and the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is greater than the thickness W of the three layers of base cloth, and preferably, the layers L1-W are formed by 0-cloth and less than 0.3mm.
The low-melting-point particles on the surfaces of the first base cloth layer and the second base cloth layer are melted and bonded under the action of ultrasonic vibration and quickly release pressure, then a bonding structure formed by the low-melting-point particles is still in a semi-molten state in the process that the base cloth continues to move forwards and is pulled into a filament bundle shape by restoring force between the two base cloth layers, the filament bundle shape fineness and filaments are kept relatively stable and further cooled due to the limitation of the limiting plate component, and then the base cloth layers are compressed again under the action of the rolling component to achieve the purpose of adhesion.
Preferably, in the second step, the distance L2= W between the two limiting wheels of the limiting wheel set.
Preferably, the distance L3 between the two press rolls on the press assembly in the second step meets 0<W-L3< W/2mm.
Preferably, in the second step, the low-melting point particles are low-melting point polypropylene particles or low-melting point polyester particles, and the melting point of the low-melting point particles is 160-180 ℃.
Preferably, the first deoxidation solution comprises the following components in percentage by weight:
Figure BDA0002988576420000041
Figure BDA0002988576420000051
the water absorption formula system mainly containing anhydrous calcium chloride and the deoxidation formula system mainly containing activated iron powder are matched to form a film adhered to the surface of the fibers in the first base cloth layer, so that the double-layer effects of water absorption and deoxidation are achieved.
Preferably, the first deoxidation solution comprises the following components in percentage by weight:
Figure BDA0002988576420000052
preferably, the second deoxidation solution comprises the following components in percentage by weight:
Figure BDA0002988576420000053
preferably, the second deoxidation solution comprises the following components in percentage by weight:
Figure BDA0002988576420000061
the deoxidation method is characterized in that a deoxidation formula system with activated iron powder, diatomite and active carbon as main bodies is adopted, the activated iron powder is used as a base, the diatomite, the active carbon and sodium chloride are used as auxiliary materials, and the deoxidation formula system is uniformly dispersed in a solution through the combined action of a dispersing agent, cross-linked starch and an adhesive, so that a film is formed and attached to the surface of a fiber and keeps stable adhesive force with the surface of the fiber.
The carrier for containing the deoxidizing component is formed by compounding the three layers of non-woven fabrics, and the carrier is of a three-dimensional reticular space structure built by fibers, so that when the carrier is soaked in a deoxidizing solution, the deoxidizing solution forms an even film on the surface of the fibers, the contact area between the deoxidizing component and the space is greatly increased, and the deoxidizing effect of the deoxidizing agent and the utilization rate of the deoxidizing agent are improved.
The first base cloth layer located on the inner layer adopts the fibers with thinner specifications and larger density, and has good one-way moisture-conducting performance, so that moisture adsorbed from the outer layer can be quickly conducted to the inner layer and absorbed by the drying agent attached to the fibers on the inner layer, and the outer layer is kept dry.
Has the advantages that:
the technical scheme of the invention has the following beneficial effects:
(1) Through ultrasonic wave hot pressing butt fusion, not only can reduce compound cost, can keep the inside spatial structure of first base cloth layer and second base cloth layer not destroyed moreover to the greatest extent.
(2) The low-melting-point particles on the surfaces of the first base cloth layer and the second base cloth layer are melted and bonded under the action of ultrasonic vibration and quickly release pressure, then the bonding structure formed by the low-melting-point particles is still in a semi-molten state in the process that the base cloth continues to move forwards and is pulled into a filament bundle shape by restoring force between the two base cloth layers, the fineness of the filament bundle shape and filaments are kept relatively stable and are further cooled due to the limitation of the limiting plate component, and then the base cloth layers are compressed again under the action of the rolling component to achieve the purpose of adhesion.
(3) The water absorption formula system mainly containing anhydrous calcium chloride and the deoxidation formula system mainly containing activated iron powder are matched to form a film adhered to the surface of the fibers in the first base cloth layer, so that the double-layer effects of water absorption and deoxidation are achieved.
(4) The deoxidation method is characterized in that a deoxidation formula system with activated iron powder, diatomite and active carbon as main bodies is adopted, the activated iron powder is used as a base, the diatomite, the active carbon and sodium chloride are used as auxiliary materials, and the deoxidation formula system is uniformly dispersed in a solution through the combined action of a dispersing agent, cross-linked starch and an adhesive, so that a film is formed and attached to the surface of a fiber and keeps stable adhesive force with the surface of the fiber.
(5) The carrier for containing the deoxidizing components is formed by compounding the three layers of non-woven fabrics, and the carrier is of a three-dimensional reticular space structure built by fibers, so that when the carrier is soaked in the deoxidizing solution, the deoxidizing solution forms an even film on the surfaces of the fibers, the contact area between the deoxidizing components and the space is greatly increased, and the deoxidizing effect of the deoxidizing agent and the utilization rate of the deoxidizing agent are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a preferred adhering apparatus of the present invention;
FIG. 2 is a partial view of a preferred hold-down assembly of the present invention.
In the figure:
1-an adhesion device; 2-a feeding roller set; 21-a first set of feed rollers; 22-a second set of feed rollers;
23-a third set of feed rollers; 3-pressing and attaching the workbench; 4-pressing the assembly; 41-pressing the laminate;
42-pressing the support rod downwards; 43-a push down drive assembly; 431-drive motor; 432-a driven wheel;
433-a cam; 44-an ultrasonic generator; 5-a slide rail; 6-driving wheel; 7-a belt;
8-laminating pattern welding joints; 9-a limiting plate component; 10-a limit wheel set; 11-roll assembly.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, environment-friendly food fresh-keeping card forming system includes adhesion device 1, adhesion device 1 includes feeding roller group 2, presses and attaches workstation 3 and pushes down subassembly 4, feeding roller group 2 is including the first feeding roller group 21 that is used for carrying the second base cloth layer on upper strata, the second feeding roller group 22 that is used for carrying the first base cloth layer in the middle of and the third feeding roller group 23 that is used for carrying the second base cloth layer of lower floor, feeding roller group 2 sets up press and attach workstation 3 entry position, it is located to push down subassembly 4 press and attach workstation 3 directly over, it adopts ultrasonic wave hot-pressing fusion to push down subassembly 4.
Through ultrasonic wave hot pressing butt fusion, not only can reduce the composite cost, can keep the spatial structure of first base cloth layer and second base cloth layer inside not destroyed moreover to the greatest extent.
As shown in fig. 2, as a preferred embodiment, the pressing assembly 4 includes a pressing plate 41, a pressing support rod 42, a pressing driving assembly 43 for controlling the pressing of the pressing support rod 42, and an ultrasonic generator 44, wherein the pressing support rod 42 is mounted on the pressing driving assembly 43, the pressing plate 41 is fixedly mounted at the lower end of the pressing support rod 42, and the ultrasonic generator 44 is mounted on the pressing support rod 42. The outer surface of the lower pressing support rod 42 is also provided with a slide rail 5 for guiding the lower pressing support rod 42 to slide up and down.
In a preferred embodiment, the pressing drive assembly 43 includes a driving motor 431, a driven wheel 432 and a cam 433, the driving motor 431 drives the driven wheel 432 to rotate, the central axis of the driven wheel 432 is coaxial with the rotating axis of the cam 433, and the cam 433 abuts against the upper end of the pressing support rod 42.
In a preferred embodiment, a driving wheel 6 is mounted on the rotating shaft of the driving motor 431, and the driving wheel 6 and the driven wheel 432 are driven by a belt 7.
In a preferred embodiment, a lamination pattern welding head 8 for ultrasonic lamination is distributed on the lower surface of the lower lamination plate 41.
As a preferred embodiment, the laminate pattern-weld 8 is a matrix sequence, and each pattern unit in the matrix sequence is one of a circle, a rectangle or an ellipse.
In a preferred embodiment, a limiting plate assembly 9 for limiting the thickness of the adhered composite sheet is mounted behind the pressing assembly 4.
In a preferred embodiment, a limiting wheel set 10 for controlling the distance between the composite front base fabrics is installed in front of the pressing component 4.
In a preferred embodiment, a rolling assembly 11 for secondary pressing of the composite sheet is installed behind the limiting plate assembly 9.
As a preferred embodiment, the apparatus further includes a dicing device (not shown) for dicing the adhered sheet.
The embodiment also provides a preparation method of the environment-friendly food preservation card, which comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 30-40wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of a second deoxidizer in the second base cloth layer to be 30-40wt%;
adhering low-melting-point particles to the upper surface and the lower surface of the first base cloth layer, and then enabling the first base cloth layer and the second base cloth layer to pass through the adhering device 1, so that the second base cloth layer is adhered to the upper surface and the lower surface of the first base cloth layer, the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
In a preferred embodiment, the ultrasonic hot-pressing time in the second step is controlled to be 0.2-0.5s, and the distance L1 between the lower surface of the limiting plate and the pressing table 3 in the limiting plate assembly 9 is greater than the thickness W of the three-layer base cloth, preferably, 0-L1-W <0.3mm.
The low-melting-point particles on the surfaces of the first base cloth layer and the second base cloth layer are melted and bonded under the action of ultrasonic vibration and quickly release pressure, then the bonding structure formed by the low-melting-point particles is still in a semi-molten state in the process that the base cloth continues to move forwards and is pulled into a filament bundle shape by restoring force between the two base cloth layers, the fineness of the filament bundle shape and filaments are kept relatively stable and are further cooled due to the limitation of the limiting plate assembly 9, and then the base cloth layers are compressed again under the action of the rolling assembly 11, so that the purpose of adhesion is achieved.
In a preferred embodiment, in the second step, the distance L2= W between the two limiting wheels of the limiting wheel set 10.
In a preferred embodiment, the distance L3 between the two press rolls on the press assembly 11 in the second step satisfies 0<W-L3< W/2mm.
In a preferred embodiment, in the second step, the low-melting point particles are low-melting point polypropylene particles or low-melting point polyester particles, and the melting point of the low-melting point particles is 160-180 ℃.
As a preferred embodiment, the content of each component in the first deoxygenating solution is as follows by weight percent:
Figure BDA0002988576420000111
the water absorption formula system mainly containing anhydrous calcium chloride and the deoxidation formula system mainly containing activated iron powder are matched to form a film adhered to the surface of the fibers in the first base cloth layer, so that the double-layer effects of water absorption and deoxidation are achieved.
As a preferred embodiment, the content of each component in the first deoxygenating solution is as follows by weight percent:
Figure BDA0002988576420000112
Figure BDA0002988576420000121
as a preferred embodiment, the content of each component in the second deoxidation solution is as follows by weight percent:
Figure BDA0002988576420000122
as a preferred embodiment, the content of each component in the second deoxidation solution is as follows by weight percent:
Figure BDA0002988576420000123
Figure BDA0002988576420000131
the method adopts a deoxidation formula system with activated iron powder, diatomite and activated carbon as main bodies, takes the activated iron powder as a base and the diatomite, the activated carbon and sodium chloride as auxiliary materials, and leads the deoxidation formula system to be uniformly dispersed in a solution through the combined action of a dispersing agent, cross-linked starch and an adhesive, thereby forming a film which is attached to the surface of the fiber and keeps stable adhesive force with the surface of the fiber.
The carrier for containing the deoxidizing components is formed by compounding the three layers of non-woven fabrics, and the carrier is of a three-dimensional reticular space structure built by fibers, so that when the carrier is soaked in the deoxidizing solution, the deoxidizing solution forms an even film on the surfaces of the fibers, the contact area between the deoxidizing components and the space is greatly increased, and the deoxidizing effect of the deoxidizing agent and the utilization rate of the deoxidizing agent are improved.
The first base cloth layer located on the inner layer adopts the fibers with thinner specifications and larger density, and has good one-way moisture-conducting performance, so that moisture adsorbed from the outer layer can be quickly conducted to the inner layer and absorbed by the drying agent attached to the fibers on the inner layer, and the outer layer is kept dry.
The beneficial effects of the freshness card obtained by the technical scheme of the embodiment are further described by several groups of examples and comparative examples, wherein the first deoxidation solution used in the examples and comparative examples is 35 parts by weight of anhydrous calcium chloride; 24 parts of activated iron powder; 8 parts of cross-linked starch; 5 parts of an adhesive; 5 parts of a dispersing agent; 100 parts of water; the second deoxidation solution comprises 30 parts of activated iron powder by weight; 25 parts of diatomite; 24 parts of activated carbon; 3 parts of sodium chloride; 5 parts of cross-linked starch; 5 parts of a dispersing agent; 8 parts of an adhesive; 100 parts of water.
The first embodiment is as follows:
the preparation method of the freshness card in the embodiment comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Example two:
the preparation method of the freshness card in the embodiment comprises the following steps:
step one, placing the cloth into a first deoxidizing solution for dipping treatment, and drying the cloth through an oven to enable the water content of the cloth to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-12N, and enabling the content of the first deoxidizer in the first base cloth layer to be 30wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-12N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 30wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, and then enabling the first base cloth layer and the second base cloth layer to pass through an adhering device to enable the second base cloth layer to be adhered to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-25N, and the amplitude is controlled to be 15-20 mu m during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.4-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Example three:
the preparation method of the freshness card in the embodiment comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 13-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 40wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller in the dipping process to be 13-15N, and enabling the content of a second deoxidizer in the second base cloth layer to be 40wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 25-30N, and the amplitude is controlled to be 20-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.3s, the distance L1 between the lower surface of the limiting plate and the pressing attachment workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the pressing assembly is 2.0mm.
Example four:
the preparation method of the freshness card in the embodiment comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polyester particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, and then enabling the first base cloth layer and the second base cloth layer to pass through an adhering device to enable the second base cloth layer to be adhered to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example one:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be 1-5% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to ensure that the moisture content of the second fabric is 1-5% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example two:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 6-9N, and enabling the content of the first deoxidizer in the first base cloth layer to be 25wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller in the dipping process to be 6-9N, and enabling the content of a second deoxidizer in the second base cloth layer to be 25wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example three:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 10-15N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 15-20KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example four:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, placing the cloth into a first deoxidizing solution for dipping treatment, and drying the cloth through an oven to enable the water content of the cloth to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 35-40N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 45-50KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example five:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing attachment workbench in the limiting plate assembly is 2.0mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the pressing assembly is 2.0mm.
Comparative example six:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% so as to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 1.5mm, and the distance L3 between two pressing rollers on the rolling assembly is 2.0mm.
Comparative example seven:
the preparation method of the freshness card in the comparative example comprises the following steps:
step one, putting the base cloth layer into a first deoxidizing solution for dipping treatment, and drying the base cloth layer in an oven to enable the water content of the base cloth layer to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 35wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller to be 10-15N in the dipping process, so that the content of a second deoxidizer in the second base cloth layer is 35wt%;
adhering low-melting-point polypropylene particles with the melting point of 160-180 ℃ to the upper surface and the lower surface of the first base cloth layer, then passing the first base cloth layer and the second base cloth layer through an adhering device to adhere the second base cloth layer to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
and step three, cutting the composite sheet into blocks to obtain the required freshness retaining cards.
And in the second step, the ultrasonic hot-pressing time is controlled to be 0.2-0.5s, the distance L1 between the lower surface of the limiting plate and the pressing and attaching workbench in the limiting plate assembly is 3.2mm, the thickness W of the three-layer base cloth is 3.0mm, the distance L2 between two limiting wheels on the limiting wheel set is 3.0mm, and the distance L3 between two pressing rollers on the rolling assembly is 1.0mm.
The fresh-keeping cards prepared in the four groups of embodiments and the seven groups of proportion are used for taking the same cake and testing the fresh-keeping effect at room temperature. The specific data are as follows:
TABLE 1 test data for freshness cards prepared by various groups of examples and comparative examples
Figure BDA0002988576420000211
Figure BDA0002988576420000221
As can be seen from Table 1, the preservation effect of the preservation card prepared in the embodiment is obviously superior to that of the comparative example and the preservation card is not used, the preservation card prepared by the production method in the embodiment can preserve cakes for more than two months without mildewing, the preservation card prepared in the embodiment has good preservation effect under the humidity condition, in addition, the preservation card can effectively avoid the damage of food appearance caused by collision with food in the transportation process, and the preservation card has the characteristics of safety, sanitation, economy, practicality and the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A preparation method of an environment-friendly food preservation card is characterized by comprising the following steps:
step one, putting the cloth I into a first deoxidizing solution for dipping treatment, and drying the cloth I in an oven to enable the moisture content of the cloth I to be below 1% to obtain a first base cloth layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of the first deoxidizer in the first base cloth layer to be 30-40wt%; placing the second fabric into a second deoxidizing solution for dipping treatment, and drying the second fabric through an oven to enable the water content of the second fabric to be below 1% to obtain a second base fabric layer; controlling the pressure of a compression roller in the dipping process to be 10-15N, and enabling the content of a second deoxidizer in the second base cloth layer to be 30-40wt%;
adhering low-melting-point particles to the upper surface and the lower surface of the first base cloth layer, and then enabling the first base cloth layer and the second base cloth layer to pass through an adhering device, so that the second base cloth layer is adhered to the upper surface and the lower surface of the first base cloth layer, wherein the ultrasonic hot-pressing pressure is 20-30N, and the amplitude is controlled to be 15-25um during welding; controlling the vibration frequency at 20-40KHz to obtain a composite sheet;
step three, cutting the composite sheet into pieces to obtain the required freshness retaining cards;
in the first step, the first deoxidation solution comprises the following components in percentage by weight:
30-40 parts of anhydrous calcium chloride
20-30 parts of activated iron powder
5-10 parts of cross-linked starch
3-8 parts of adhesive
3-8 parts of dispersant
100 portions of water
The second deoxidation solution comprises the following components in percentage by weight:
activated iron powder 25-40 parts
20-30 parts of diatomite
20-30 parts of activated carbon
2-5 parts of sodium chloride
3-8 parts of cross-linked starch
3-8 parts of dispersant
5-10 parts of adhesive
And 100 parts of water.
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