CN114987946B - Dining package with moisture absorption patch and preparation method of moisture absorption patch - Google Patents
Dining package with moisture absorption patch and preparation method of moisture absorption patch Download PDFInfo
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- CN114987946B CN114987946B CN202210529484.3A CN202210529484A CN114987946B CN 114987946 B CN114987946 B CN 114987946B CN 202210529484 A CN202210529484 A CN 202210529484A CN 114987946 B CN114987946 B CN 114987946B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 147
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 117
- 239000002250 absorbent Substances 0.000 claims abstract description 45
- 230000002745 absorbent Effects 0.000 claims abstract description 45
- 238000004806 packaging method and process Methods 0.000 claims abstract description 37
- 150000004676 glycans Chemical class 0.000 claims abstract description 28
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 28
- 239000005017 polysaccharide Substances 0.000 claims abstract description 28
- 239000012790 adhesive layer Substances 0.000 claims abstract description 13
- 235000013305 food Nutrition 0.000 claims abstract description 11
- 235000012054 meals Nutrition 0.000 claims abstract description 10
- 238000004132 cross linking Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 20
- 229920002752 Konjac Polymers 0.000 claims description 19
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 17
- 239000001110 calcium chloride Substances 0.000 claims description 17
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 17
- 239000000252 konjac Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- 229920001285 xanthan gum Polymers 0.000 claims description 8
- 239000000230 xanthan gum Substances 0.000 claims description 8
- 235000010493 xanthan gum Nutrition 0.000 claims description 8
- 229940082509 xanthan gum Drugs 0.000 claims description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 7
- 235000019823 konjac gum Nutrition 0.000 claims description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 7
- 235000011152 sodium sulphate Nutrition 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 31
- 239000011148 porous material Substances 0.000 description 16
- 235000010485 konjac Nutrition 0.000 description 12
- 238000009777 vacuum freeze-drying Methods 0.000 description 12
- 238000001035 drying Methods 0.000 description 10
- 230000007480 spreading Effects 0.000 description 10
- 238000003892 spreading Methods 0.000 description 10
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 description 9
- 241001312219 Amorphophallus konjac Species 0.000 description 9
- 235000001206 Amorphophallus rivieri Nutrition 0.000 description 9
- 229920002581 Glucomannan Polymers 0.000 description 9
- 229940046240 glucomannan Drugs 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000007704 transition Effects 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 238000004108 freeze drying Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000003230 hygroscopic agent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000000679 carrageenan Substances 0.000 description 1
- 235000010418 carrageenan Nutrition 0.000 description 1
- 229920001525 carrageenan Polymers 0.000 description 1
- 229940113118 carrageenan Drugs 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000012020 french fries Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
- B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Freezing, Cooling And Drying Of Foods (AREA)
- Packages (AREA)
Abstract
The invention relates to the technical field of food packaging, and provides a dining package with a moisture absorption patch and a preparation method thereof. The meal package comprises: the packaging body is provided with a packaging cavity for accommodating food and a packaging opening communicated with the packaging cavity; the moisture absorption patch is arranged in the packaging cavity and comprises a moisture absorption layer and an adhesive layer, and the moisture absorption layer is connected with the adhesive layer to form a patch structure; the moisture absorption layer comprises a porous net-shaped structure layer formed by crosslinking polysaccharide and a moisture absorbent; the porous net-shaped structure layer comprises a compact moisture absorption layer and a loose moisture absorption layer which are connected, the compact moisture absorption layer is connected with the bonding layer, and the aperture of the compact moisture absorption layer is smaller than that of the loose moisture absorption layer. The beneficial effects of the invention are as follows: the moisture absorption layer is a porous net structure layer formed by crosslinking polysaccharide and a moisture absorbent, has the characteristics of no toxicity, no harm and edibility, can effectively ensure the safety of food, and has high moisture absorption rate and good moisture absorption effect.
Description
Technical Field
The invention belongs to the technical field of food packaging, and particularly relates to a dining package with a moisture absorption patch and a preparation method of the moisture absorption patch.
Background
Currently, a meal for central kitchen or take-out distribution needs to undergo a packaging and transportation process. Moisture is contained in the air in the upper space of the food package, and the moisture condenses when the temperature reaches the dew point temperature. Generally, dew point temperature varies depending on altitude, air humidity, and the like, and condensed water is more easily generated due to a large humidity. The condensed water produced by the package of the meal affects the mouthfeel of the food, and thus moisture absorption treatment is required. The conventional method for absorbing water by using the package for eating mainly adopts moisture absorption packages such as quicklime and the like, has poor safety and low moisture absorption rate, and is inconvenient to apply and operate.
Disclosure of Invention
The invention aims to solve the problem that the existing quicklime moisture absorption bag affects food safety, and provides a dining package piece with a moisture absorption patch and a preparation method of the moisture absorption patch.
In a first aspect, the present invention provides a meal package with an absorbent patch comprising:
a package body having a package cavity for accommodating food and a package port communicating with the package cavity;
The sealing structure is arranged on the packaging body and is used for sealing or opening the packaging opening; and
The moisture absorption patch is arranged in the packaging cavity and comprises a moisture absorption layer and an adhesive layer, and the moisture absorption layer is connected with the adhesive layer to form a patch structure; the moisture absorption layer comprises a porous net structure layer formed by crosslinking polysaccharide and a moisture absorbent; the porous reticular structure layer comprises a compact moisture absorption layer and a loose moisture absorption layer which are connected, wherein the compact moisture absorption layer is connected with the bonding layer, and the aperture of the compact moisture absorption layer is smaller than that of the loose moisture absorption layer.
Further, the polysaccharide comprises a mixture comprising konjac gum and xanthan gum; the moisture absorbent comprises a mixture comprising calcium chloride and sodium sulfate.
Further, the dosage ratio of the polysaccharide to the moisture absorbent is a:b, wherein the value range of a is 1.5-10, and the value range of b is 15-50.
Further, the aperture of the compact moisture absorption layer is 50-500 mu m, and the aperture of the loose moisture absorption layer is 1-3 mm.
Further, the thickness of the compact moisture absorption layer is 1/4-3/4 of the thickness of the moisture absorption patch, and the thickness of the loose moisture absorption layer is 2/3-3/4 of the thickness of the moisture absorption patch.
Further, the package body includes a packing box or a packing bag.
In a second aspect, the present invention also provides a method for preparing an absorbent patch, including the steps of:
Flattening the solution containing the polysaccharide and the hygroscopic agent, and vacuum freeze-drying to form a porous net-shaped structure layer formed by crosslinking the polysaccharide and the hygroscopic agent, and taking the porous net-shaped structure layer as a hygroscopic layer of the hygroscopic patch; wherein the polysaccharide comprises konjac glucomannan, and the moisture absorbent comprises calcium chloride;
and arranging an adhesive layer on one end face of the moisture absorption layer to form a moisture absorption patch with the moisture absorption layer and the adhesive layer, and sealing and packaging to finish the preparation of the moisture absorption patch.
Further, the step of flattening the solution containing the polysaccharide and the moisture absorbent includes:
firstly flattening the solution A, and then flattening the solution B above the solution A; wherein the solution A comprises 1.5-10% of polysaccharide and 15-50% of moisture absorbent; the solution B contains 0.5-3% of polysaccharide and 10-30% of moisture absorbent.
Further, the step of vacuum freeze-drying comprises:
the container containing the solution A and the solution B is placed in a refrigerator to be frozen to-20 ℃ so that the solution A and the solution B are frozen into an integral structure;
carrying out vacuum freeze drying treatment on the integral structure of the solution A and the solution B frozen to the temperature of minus 20 ℃ by using a freeze dryer;
And (3) drying the whole structure subjected to vacuum freeze drying treatment again by using a hot air dryer, and drying at a drying temperature higher than 105 ℃ until the whole structure is in an absolute dry state, so that a part of the whole structure corresponding to the solution A forms a compact moisture absorption layer of the porous reticular structure layer, and a part of the whole structure corresponding to the solution B forms a loose moisture absorption layer of the porous reticular structure layer.
Further, the polysaccharide comprises a mixture comprising konjac gum and xanthan gum; the moisture absorbent is a mixture containing calcium chloride and sodium sulfate.
The beneficial effects of the invention are as follows: the invention forms a patch structure by connecting the moisture absorption layer with the bonding layer, can be conveniently arranged in a meal packaging bag or a meal packaging box, is convenient for carrying out moisture absorption treatment on condensed water generated by meal packaging, and has the characteristics of no toxicity, no harm and eating because the moisture absorption layer is a porous net-shaped structure layer formed by crosslinking polysaccharide and a moisture absorbent, can effectively ensure the food safety, and has high moisture absorption rate and good moisture absorption effect.
Drawings
Fig. 1 is a schematic view of the construction of an absorbent patch of the meal package with an absorbent patch of the present invention.
Fig. 2 is a schematic flow chart of a method for preparing the absorbent patch of the present invention.
In the figure, 10-hygroscopic layer; 11-a dense moisture absorption layer; 12-a loose moisture absorption layer; 20-an adhesive layer.
Detailed Description
The invention is described in further detail below with reference to fig. 1 to 2 and the specific examples.
The invention provides a meal package with a moisture absorption patch, which comprises: packaging body, seal structure and moisture absorption paster.
The package body has a package cavity for accommodating food and a package opening communicating with the package cavity.
The sealing structure is arranged on the packaging body and is used for sealing or opening the packaging opening.
In this embodiment, the package body includes a package box or a package bag.
Correspondingly, when the package body is a package box, the sealing structure comprises a box cover matched with the package box. When the packaging body is a packaging bag, the sealing structure comprises a sealing rope arranged at a packaging opening or a bag opening of the packaging bag, the sealing rope is used for binding the packaging opening or the bag opening to realize sealing, and when the binding of the sealing rope is released, the opening of the packaging opening is realized.
The moisture absorption patch is arranged in the packaging cavity. The specific setting position can be flexibly adjusted according to different structures of the package body. For example, when the package body is a package, the absorbent patch may be disposed on a side wall of the package or a cover on the top of the package.
As shown in fig. 1, the absorbent patch comprises an absorbent layer 10 and an adhesive layer 20, wherein the absorbent layer 10 and the adhesive layer 20 are connected to form a patch structure; the moisture absorption layer 10 comprises a porous net structure layer formed by crosslinking polysaccharide and a moisture absorbent; the porous net-shaped structure layer comprises a compact moisture absorption layer 11 and a loose moisture absorption layer 12 which are connected, the compact moisture absorption layer 11 is connected with the bonding layer 20, and the aperture of the compact moisture absorption layer 11 is smaller than that of the loose moisture absorption layer 12.
The polysaccharide comprises a mixture containing konjac gum and xanthan gum; the moisture absorbent comprises a mixture comprising calcium chloride and sodium sulfate.
The dosage ratio of the polysaccharide to the moisture absorbent is a:b, wherein the value range of a is 1.5-10, and the value range of b is 15-50.
The pore diameter of the compact hygroscopic layer 11 is 50-500 mu m, and the pore diameter of the loose hygroscopic layer 12 is 1-3 mm.
The thickness of the compact moisture absorption layer 11 is 1/4-3/4 of the thickness of the moisture absorption patch, and the thickness of the loose moisture absorption layer 12 is 2/3-3/4 of the thickness of the moisture absorption patch.
Based on the same inventive concept, the invention also provides a preparation method of the moisture absorption patch, as shown in fig. 2, comprising the following steps:
Flattening the solution containing the polysaccharide and the hygroscopic agent, and vacuum freeze-drying to form a porous net-shaped structure layer formed by crosslinking the polysaccharide and the hygroscopic agent, and taking the porous net-shaped structure layer as a hygroscopic layer of the hygroscopic patch; wherein the polysaccharide comprises konjac glucomannan, and the moisture absorbent comprises calcium chloride;
and arranging an adhesive layer on one end face of the moisture absorption layer to form a moisture absorption patch with the moisture absorption layer and the adhesive layer, and sealing and packaging to finish the preparation of the moisture absorption patch.
The step of flattening the solution containing the polysaccharide and the moisture absorbent comprises:
firstly flattening the solution A, and then flattening the solution B above the solution A; wherein the solution A comprises 1.5-10% of polysaccharide and 15-50% of moisture absorbent; the solution B contains 0.5-3% of polysaccharide and 10-30% of moisture absorbent.
The vacuum freeze-drying step comprises the following steps:
And (3) placing the container containing the solution A and the solution B in a refrigerator to be frozen to-20 ℃ so that the solution A and the solution B are frozen into a whole structure.
And (3) performing vacuum freeze drying treatment on the integral structure of the solution A and the solution B frozen to the temperature of minus 20 ℃ by using a freeze dryer.
And (3) drying the whole structure subjected to vacuum freeze drying treatment again by using a hot air dryer, and drying at a drying temperature higher than 105 ℃ until the whole structure is in an absolute dry state, so that a part of the whole structure corresponding to the solution A forms a compact moisture absorption layer of the porous reticular structure layer, and a part of the whole structure corresponding to the solution B forms a loose moisture absorption layer of the porous reticular structure layer.
The polysaccharide comprises a mixture containing konjac gum and xanthan gum; the moisture absorbent is a mixture containing calcium chloride and sodium sulfate.
The mass ratio of the adsorbent to the polysaccharide component is preferably 10:90-90:10, and the prepared moisture absorption patch has the outstanding advantages of large moisture absorption capacity, high moisture absorption rate, convenience in use, excellent effect and the like.
In other embodiments, the moisture absorption patch is a porous net-shaped structure layer mainly formed by crosslinking polysaccharide and a moisture absorbent, the pore diameter is preferably changed in a gradient pore diameter, and a middle pore diameter transition layer can be arranged between the dense moisture absorption layer and the loose moisture absorption layer, so that the moisture absorption effect is better.
The following illustrates the method of preparing the absorbent patch of the present invention:
Example 1
The embodiment provides a method for preparing a moisture absorption patch, which comprises the following steps:
s1, spreading high-concentration moisture absorption liquid (namely solution A): a high concentration solution containing 9wt% of konjac glucomannan and 40% of calcium chloride was spread to a thickness of 2mm in a flat plate having a bottom area of 4cm X6 cm.
S2, spreading low-concentration moisture absorption liquid (namely solution B): then, a low concentration solution containing 3wt% of konjac glucomannan and 20% of calcium chloride was spread over the high concentration moisture absorption liquid to a thickness of 8mm.
S3, drying: then freezing the mixture in a refrigerator at-20 ℃ together with a container containing low-concentration moisture absorption liquid and high-concentration moisture absorption liquid, further performing vacuum freeze drying on the whole by using a freeze dryer, putting the whole into a hot air dryer after freeze drying, and treating the whole for 24 hours at a temperature higher than 105 ℃ to an absolute dry state. The porous net-shaped structure layer is formed on the part corresponding to the high-concentration moisture absorption liquid, and the porous net-shaped structure layer is formed on the part corresponding to the low-concentration moisture absorption liquid.
And S4, finally, attaching double faced adhesive tape to one side of the compact moisture absorption layer, and sealing and packaging to obtain the moisture absorption patch.
In this example, the porous pore size of the dense absorbent layer was 50 μm on average and the pore size of the porous absorbent layer was 2mm on average.
Example 2
The embodiment provides a method for preparing a moisture absorption patch, which comprises the following steps:
s1, spreading high-concentration moisture absorption liquid: a high concentration solution containing 3wt% of konjac glucomannan and 20% of calcium chloride was spread to a thickness of 2mm in a flat plate having a bottom area of 4 cm. Times.6 cm.
S2, spreading low-concentration moisture absorption liquid: then, the solution of 1wt% konjak gum and 10% calcium chloride was spread to a thickness of 8mm.
S3, drying: then freezing the mixture in a refrigerator at-20 ℃ together with a container containing low-concentration moisture absorption liquid and high-concentration moisture absorption liquid, further performing vacuum freeze drying on the whole by using a freeze dryer, putting the whole into a hot air dryer after freeze drying, and treating the whole for 24 hours at a temperature higher than 105 ℃ to an absolute dry state. The porous net-shaped structure layer is formed on the part corresponding to the high-concentration moisture absorption liquid, and the porous net-shaped structure layer is formed on the part corresponding to the low-concentration moisture absorption liquid.
And S4, finally, attaching double faced adhesive tape to one side of the compact moisture absorption layer, and sealing and packaging to obtain the moisture absorption patch.
In this example, the porous pore size of the dense hygroscopic layer was 300 μm on average and the pore size of the loose hygroscopic layer was 2mm on average.
Example 3
The embodiment provides a method for preparing a moisture absorption patch, which comprises the following steps:
s1, spreading high-concentration moisture absorption liquid: a high concentration solution containing 9wt% of konjac glucomannan and 40% of calcium chloride was spread to a thickness of 2mm in a flat plate having a bottom area of 4cm X6 cm.
S2, spreading a medium-concentration moisture absorption liquid: on the high-concentration moisture absorption liquid, a medium-concentration solution containing 3wt% of konjak gum and 40% of calcium chloride is flattened, and the thickness is 2mm.
S3, spreading low-concentration moisture absorption liquid: then, a low concentration solution containing 1wt% of konjac glucomannan and 10% of calcium chloride was spread over the medium concentration moisture absorption liquid to a thickness of 6mm.
S4, drying: then freezing together with the container containing low, medium and high concentration moisture absorption liquid in a refrigerator at-20 ℃, further vacuum freeze-drying the whole by using a freeze dryer, and after freeze drying, putting into a hot air dryer and processing for 24 hours at a temperature higher than 105 ℃ to an absolute dry state. The dense moisture absorption layer of the porous net structure layer is formed corresponding to the part of the high-concentration moisture absorption liquid, the loose moisture absorption layer of the porous net structure layer is formed corresponding to the part of the low-concentration moisture absorption liquid, and the intermediate aperture transition layer of the porous net structure layer is formed corresponding to the part of the medium-concentration moisture absorption liquid.
And S4, finally, attaching double faced adhesive tape to one side of the compact moisture absorption layer, and sealing and packaging to obtain the moisture absorption patch.
In this example, the porous pore diameter of the dense moisture absorption layer was 300 μm on average, the pore diameter of the intermediate pore diameter transition layer was 1mm on average, and the pore diameter of the loose moisture absorption layer was 2mm on average.
Example 4
The embodiment provides a method for preparing a moisture absorption patch, which comprises the following steps:
s1, spreading high-concentration moisture absorption liquid: a high concentration solution containing 3wt% of konjac gum, 6wt% of xanthan gum, 10% of calcium chloride and 30% of sodium sulfate was spread out in a flat plate having a bottom area of 4cm X6 cm to a thickness of 2mm.
S2, spreading a medium-concentration moisture absorption liquid: on the high-concentration moisture absorption liquid, a medium-concentration solution of 1wt% of konjak gum, 2wt% of xanthan gum, 5% of calcium chloride and 5% of sodium sulfate is flattened, and the thickness is 2mm.
S3, spreading low-concentration moisture absorption liquid: then, a low concentration solution containing 0.5wt% of konjac glucomannan and 10% of calcium chloride was spread over the medium concentration moisture absorption liquid to a thickness of 6mm.
S4, drying: then freezing together with the container containing low, medium and high concentration moisture absorption liquid in a refrigerator at-20 ℃, further vacuum freeze-drying the whole by using a freeze dryer, and after freeze drying, putting into a hot air dryer and processing for 24 hours at a temperature higher than 105 ℃ to an absolute dry state. The dense moisture absorption layer of the porous net structure layer is formed corresponding to the part of the high-concentration moisture absorption liquid, the loose moisture absorption layer of the porous net structure layer is formed corresponding to the part of the low-concentration moisture absorption liquid, and the intermediate aperture transition layer of the porous net structure layer is formed corresponding to the part of the medium-concentration moisture absorption liquid.
And S4, finally, attaching double faced adhesive tape to one side of the compact moisture absorption layer, and sealing and packaging to obtain the moisture absorption patch.
In this example, the porous pore diameter of the dense moisture absorption layer was 50 μm on average, the intermediate pore diameter of the transition layer was 1.2mm on average, and the pore diameter of the loose moisture absorption layer was 2.2mm on average.
Comparative example 1
This comparative example provides an absorbent patch which is substantially identical to the preparation method of example 1, except that: the konjac gum is replaced by an equal amount of xanthan gum.
Comparative example 2
This comparative example provides an absorbent patch which is substantially identical to the preparation method of example 1, except that: and the same amount of carrageenan is used for replacing the konjac glucomannan.
The moisture absorption patches of examples 1 to 4 and comparative examples 1 to 2 were respectively adhered to the upper surface of the inside of a cutlery box of the same size, 100g of french fries were placed in the box, the cover was closed, and after 30 minutes of holding, the humidity of the air in the cutlery box was measured.
The air humidity in the cutlery box provided with the moisture absorbing patch of example 1 was 10%;
the air humidity in the cutlery box provided with the moisture absorbing patch of example 2 was 20%;
the air humidity in the cutlery box provided with the absorbent patch of example 3 was 15%;
the air humidity in the cutlery box provided with the absorbent patch of example 4 was 12%;
the moisture of air in the cutlery box of the moisture absorbing patch of comparative example 1 was 17%;
The humidity of the air in the cutlery box of the moisture absorbing patch of comparative example 2 was 18%.
It is apparent that the humidity of the air in the cutlery box of the absorbent patches of examples 1-4 was lower than that of the cutlery boxes of the absorbent patches of comparative examples 1 and 2. In examples 1 to 4, however, the humidity of the air in the cutlery box of the absorbent patch of example 1 was the lowest, so that the absorbent effect of the absorbent patch was the best among examples 1 to 4.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be comprehended by those skilled in the art and are intended to be within the scope of the invention.
Claims (1)
1. A package for a meal having an absorbent patch, comprising:
a package body having a package cavity for accommodating food and a package port communicating with the package cavity;
The sealing structure is arranged on the packaging body and is used for sealing or opening the packaging opening; and
The moisture absorption patch is arranged in the packaging cavity and comprises a moisture absorption layer and an adhesive layer, and the moisture absorption layer is connected with the adhesive layer to form a patch structure; the moisture absorption layer comprises a porous net structure layer formed by crosslinking polysaccharide and a moisture absorbent; the porous reticular structure layer comprises a dense moisture absorption layer and a loose moisture absorption layer which are connected, the dense moisture absorption layer is connected with the bonding layer, and the aperture of the dense moisture absorption layer is smaller than that of the loose moisture absorption layer;
The polysaccharide comprises a mixture of konjac gum and xanthan gum; the moisture absorbent comprises a mixture of calcium chloride and sodium sulfate;
The dosage ratio of the polysaccharide to the moisture absorbent is a:b, wherein the value range of a is 1.5-10%, and the value range of b is 15-50%;
The aperture of the dense moisture absorption layer is 50-500 mu m, and the aperture of the loose moisture absorption layer is 1-3 mm;
The thickness of the compact moisture absorption layer is 1/4~3/4 of the thickness of the moisture absorption patch, and the thickness of the loose moisture absorption layer is 2/3~3/4 of the thickness of the moisture absorption patch;
The packaging body is a packaging bag, and the sealing structure comprises a sealing rope arranged at a packaging opening of the packaging bag.
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