Condensation control device for fresh-keeping refrigerator and refrigerator fresh-keeping box having the same

Abstract

The present invention provides a condensation control device for a fresh-keeping refrigerator, comprising drainage paper and a synthetic fiber non-woven fabric loading surface, wherein the synthetic fiber non-woven fabric loading surface is covered on the surface of the drainage paper; wherein the drainage paper comprises a drainage paper base paper and a moisture absorption and desorption material, and the drainage paper base paper and the moisture absorption and desorption material are combined by an impregnation process or a coating process. The condensation control device for a fresh-keeping refrigerator provided by the present invention is safe and environmentally friendly, and significantly reduces the amount of condensation in the box when the storage capacity of fruits and vegetables is large. When the storage capacity of fruits and vegetables is small, the humidity in the box will not be reduced to accelerate the wilting of fruits and vegetables, thereby further improving the preservation effect of fruits and vegetables. The present invention also provides a refrigerator fresh-keeping box having the same.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping refrigerators, and in particular to a condensation control device for a fresh-keeping refrigerator and a refrigerator fresh-keeping box having the same. Background Art

[0002] With rising living standards and shifting consumer attitudes, consumers' demands for refrigerator functionality are growing. Previously, they simply desired refrigerators to extend food shelf life, but now they are increasingly demanding sensory and nutritional factors. Fresh fruits and vegetables are essential sources of vitamins, minerals, and dietary fiber, possessing unique shapes, colors, and flavors, making them crucial for maintaining human function and health. Even after harvest, fruits and vegetables remain living organisms, undergoing complex life processes such as dormancy, water evaporation, and respiration. The refrigerator industry has continuously innovated around the concept of fruit and vegetable freshness, resulting in a variety of preservation technologies, such as refrigeration, atmosphere-controlled preservation, and chemical preservation. These preservation methods primarily address the three key factors of fruit and vegetable preservation: temperature, humidity, and the atmospheric environment. Humidity maintenance is a crucial factor in fruit and vegetable freshness preservation. With the rapid development of modern society and the accelerated pace of consumer lifestyles, refrigerators are playing an increasingly important role in households. Refrigerator crisper drawers are growing in size, allowing larger quantities of food to be stored in the refrigerator, bringing significant convenience to consumers. However, this can lead to increased humidity within the refrigerator crisper drawers, resulting in significant condensation. Furthermore, the temperature inside a refrigerator's crisper varies, with the temperature near the inner wall being relatively low, making condensation more likely to form. As condensation accumulates on the refrigerator's inner wall, it forms a stream of condensation, which not only affects the senses but also causes bacteria to grow in fruits and vegetables soaked in water, compromising their preservation. If this condensation could be directed to the main dew control material at the initial stage of its formation using a dew control device, it would prevent condensation from accumulating, thereby controlling the formation of dew inside the crisper. Therefore, effectively regulating the amount of condensation inside crispers, particularly in fresh-keeping refrigerators, without affecting the humidity of the fruit and vegetables being stored, is of great significance to the preservation of fruit and vegetables and the development of the refrigerator industry.

[0003] Commonly used humidity control materials fall into two categories: physical and chemical. Chemical humidity control is not commonly used due to its unstable performance and easy decomposition. Commonly used physical humidity control materials, such as silica gel, molecular sieves, and activated alumina, are mostly solid particles with low moisture absorption capacity, only 10-30% of their own mass. They require large amounts and easily break during repeated moisture absorption and desorption, affecting their effectiveness. Ionic reagents such as LiCl, CaCl2, and MgCl2, while having large moisture absorption capacity and speed, are difficult to regenerate after moisture absorption due to their solubility, making them difficult to use directly. Summary of the Invention

[0004] In order to solve the technical defects and shortcomings of the prior art, the present invention provides a condensation control device for a fresh-keeping refrigerator and a refrigerator fresh-keeping box having the same.

[0005] A condensation control device for a fresh-keeping refrigerator includes drainage paper and a synthetic fiber non-woven fabric loading surface, wherein the synthetic fiber non-woven fabric loading surface is covered on the surface of the drainage paper; wherein the drainage paper includes a drainage paper base paper and a moisture absorption and desorption material, and the drainage paper base paper and the moisture absorption and desorption material are combined by impregnation or coating.

[0006] Compared with the existing technology, the advantages of the present invention are that the hydrophilic synthetic fiber nonwoven fabric loading surface and the highly hygroscopic drainage paper can absorb moisture in high-humidity environments with large fruit and vegetable storage capacities, reducing condensation and thereby controlling the amount of condensation in the refrigerator. At the same time, when the fruit and vegetable storage capacity is low, the condensation control device for a fresh-keeping refrigerator will no longer absorb moisture from the fresh-keeping box. In fact, under low humidity conditions, it will dissipate some moisture to maintain the humidity environment within the fresh-keeping box, preventing the fruits and vegetables from losing moisture and wilting. The condensation control device for a fresh-keeping refrigerator can autonomously absorb or release moisture according to the ambient humidity, thereby controlling the ambient humidity. The material can maintain its hygroscopic function at around 4°C without hardening, is non-toxic and harmless, and can be reused without replacement.

[0007] Preferably, the condensation control device for a fresh-keeping refrigerator comprises a main body and a strip-shaped extension portion, one end of the extension portion is connected to the main body, and a plurality of extension portions are arranged at intervals around the main body.

[0008] Optionally, the synthetic fiber non-woven fabric loading surface is one or more of hydrophilic acrylic fiber non-woven fabric, polyester fiber non-woven fabric, and vinylon fiber non-woven fabric, and the weight of the synthetic fiber non-woven fabric loading surface is 80-150g / m 2 , thickness is 0.5-5mm.

[0009] Preferably, the drainage paper base paper is made of one or more of bleached chemical wood pulp, hemp pulp, bamboo pulp, and cotton pulp fibers with medium to low beating degrees, with a wet strength agent added, and is made using wet papermaking equipment; wherein the wet strength agent is one or more of polyamide epichlorohydrin (PAE) and melamine formaldehyde resin, and the mass of the wet strength agent is 0.5-1.5% of the absolute dry fiber mass.

[0010] Optionally, the drainage paper base paper has a basis weight of 20-50 g / m 2 , longitudinal tensile strength ≥0.3kN / m.

[0011] Preferably, the above-mentioned moisture absorption and desorption material includes hydrophilic polymers and water-soluble inorganic salts; wherein the hydrophilic polymers include polysaccharides, such as one or more of chitosan and its derivatives, starch and its derivatives, nanocellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and sodium alginate; and / or polyols, such as one or more of polyvinyl alcohol (PVA), polyethylene glycol (PEG), polyether polyols and polyester polyols; the above-mentioned water-soluble inorganic salts are one or more of water-soluble salts of lithium, sodium, ammonium, potassium, calcium, magnesium, zinc, aluminum, copper, iron and cesium.

[0012] Preferably, the drainage paper and the synthetic fiber non-woven fabric loading surface are combined by hot pressing, wherein the hot pressing temperature is 160-250° C., the pressure is 1-6 MPa, and the duration is 1-10 min.

[0013] Optionally, the drainage paper has a water absorption height of ≥45 mm / 2 min and a water absorption capacity of ≥250%.

[0014] Optionally, the mass of the moisture absorption and desorption material is 50%-60% of the mass of the drainage paper base.

[0015] The present invention also provides a refrigerator fresh-keeping box, which has a square inner cavity and a hole on the rear wall of the inner cavity. At least a part of the condensation control device for the fresh-keeping refrigerator covers the hole for exchanging air with the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 A schematic cross-sectional view of a condensation control device for a fresh-keeping refrigerator according to an embodiment of the present invention is shown;

[0017] Attachment Figure 2 A schematic cross-sectional structure diagram of drainage paper provided according to one embodiment of the present invention is shown;

[0018] Attachment Figure 3 A front structural diagram of a condensation control device for a fresh-keeping refrigerator provided in one embodiment of the present invention is shown;

[0019] Attachment Figure 4 A schematic structural diagram of a refrigerator fresh-keeping box provided according to an embodiment of the present invention is shown;

[0020] Wherein, the reference numerals represent the following:

[0021] 1. Refrigerator fresh-keeping box; 10. Condensation control device for fresh-keeping refrigerator; 20. Drainage paper; 30. Synthetic fiber non-woven fabric loading surface; 101. Main body; 102. Extension; 201. Drainage paper base paper; 202. Moisture absorption and release material. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] In order to make the purpose, technical solutions and advantages of the patent application of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below.

[0024] The present invention provides a condensation control device for a fresh-keeping refrigerator and a preparation method thereof. Figure 1 FIG1 shows a cross-sectional structural diagram of a condensation control device for a fresh-keeping refrigerator according to the present invention. Figure 1 The condensation control device 10 for a fresh-keeping refrigerator includes a drainage paper 20 and a synthetic fiber non-woven fabric loading surface 30. The synthetic fiber non-woven fabric loading surface 30 is covered on the surface of the drainage paper 20. Figure 2 The cross-sectional structure diagram of the drainage paper of the present invention is shown. Figure 2 The drainage paper 20 includes a drainage paper base paper 201 and a moisture absorption and desorption material 202. The drainage paper base paper 201 and the moisture absorption and desorption material 202 are combined by impregnation or coating.

[0025] In one embodiment of the present invention, the synthetic fiber non-woven fabric loading surface 30 is one or more of hydrophilic acrylic fiber non-woven fabric, polyester fiber non-woven fabric, and vinylon fiber non-woven fabric, and the weight of the synthetic fiber non-woven fabric loading surface 30 is 80-150g / m 2 , thickness is 0.5-5mm.

[0026] In one embodiment of the present invention, the drainage paper base paper 201 is made of one or more of bleached chemical wood pulp, hemp pulp, bamboo pulp, and cotton pulp with medium to low beating degree, with a wet strength agent added, and is made using wet papermaking equipment. The wet strength agent is one or more of polyamide epichlorohydrin (PAE) and melamine formaldehyde resin; the weight of the wet strength agent is 0.5-1.5% of the absolute dry fiber weight. The drainage paper base paper 201 has a basis weight of 20-50 g / m 2 , longitudinal tensile strength ≥0.3kN / m.

[0027] In another embodiment of the present invention, the moisture absorption and desorption material 202 includes a hydrophilic high molecular polymer and a water-soluble inorganic salt.

[0028] Among them, the hydrophilic polymers include polysaccharides, such as one or more of chitosan and its derivatives, starch and its derivatives, nanocellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and sodium alginate; and / or polyols, such as one or more of polyvinyl alcohol (PVA), polyethylene glycol (PEG), polyether polyols, and polyester polyols.

[0029] The water-soluble inorganic salt is one or more of a water-soluble salt of lithium, a water-soluble salt of sodium, a water-soluble salt of ammonium, a water-soluble salt of potassium, a water-soluble salt of calcium, a water-soluble salt of magnesium, a water-soluble salt of zinc, a water-soluble salt of aluminum, a water-soluble salt of copper, a water-soluble salt of iron and a water-soluble salt of cesium.

[0030] In one embodiment of the present invention, the drainage paper 20 and the synthetic fiber nonwoven fabric loading surface 30 are bonded via hot pressing at a temperature of 160-250°C, a pressure of 1-6 MPa, and a duration of 1-10 minutes. This hot pressing method achieves the following technical benefits: 1. Enhanced material density and improved gas barrier properties, resulting in better preservation; 2. Thinner material facilitates moisture removal; 3. The smooth surface of the material facilitates condensation formation, shortening the moisture removal path.

[0031] In one embodiment of the present invention, the drainage paper 20 has a water absorption height of ≥45 mm / 2 min and a water absorption capacity of ≥250%.

[0032] In another embodiment of the present invention, the mass of the moisture absorption and desorption material 202 is 50%-60% of the mass of the drainage paper base paper 201 .

[0033] During use, the hydrophilic synthetic fiber nonwoven fabric loading surface 30 and the highly hygroscopic drainage paper 20 absorb moisture in high-humidity environments with large fruit and vegetable storage volumes, reducing condensation and thereby controlling condensation in the refrigerator. Furthermore, when the fruit and vegetable storage volume is low, the condensation control device 10 for fresh-keeping refrigerators will no longer absorb moisture from the fresh-keeping box. In fact, under low humidity conditions, it will dissipate some moisture to maintain the humidity within the box, preventing the fruits and vegetables from losing moisture and wilting. Compared to existing technologies, the condensation control device 10 for fresh-keeping refrigerators can autonomously absorb or release moisture according to the ambient humidity, thereby controlling the ambient humidity. This material maintains its hygroscopic function at temperatures around 4°C without hardening, is non-toxic and harmless, and is reusable, requiring no replacement.

[0034] Attachment Figure 3 FIG2 shows a front structural diagram of a condensation control device 10 for a fresh-keeping refrigerator according to an embodiment of the present invention. Figure 3The condensation control device 10 for a fresh-keeping refrigerator comprises a main body 101 and a strip-shaped extension 102. One end of the extension 102 is connected to the main body 101, and multiple extensions 102 are spaced around the main body 101. Due to the structure of the refrigerator, the temperature of the refrigerator's fresh-keeping box is lower near the refrigerator's inner wall. When there are temperature differences within the refrigerator's fresh-keeping box, the amount of condensation varies in different parts of the refrigerator's fresh-keeping box, especially in the corners of the rear wall of the fresh-keeping box. Through the extension 102, the condensation control device 10 for a fresh-keeping refrigerator can absorb condensation in the corners of the refrigerator's fresh-keeping box through drainage into the main body 101, and then discharge the condensation during the air-cooling cycle of the refrigerator, thereby controlling the amount of condensation in the refrigerator.

[0035] Attachment Figure 4 FIG2 shows a schematic structural diagram of a refrigerator fresh-keeping box according to another embodiment of the present invention. Figure 4 The present invention further provides a refrigerator fresh-keeping box 1 having a square inner cavity with a hole disposed on the rear wall thereof. At least a portion of the condensation control device 10 for a fresh-keeping refrigerator covers the hole, thereby exchanging air with the outside air. For example, the main body 101 of the condensation control device 10 for a fresh-keeping refrigerator covers the hole in the refrigerator fresh-keeping box 1, while the extension 102 is disposed on the rear wall surface of the inner cavity of the refrigerator fresh-keeping box 1.

[0036] The present invention also provides the use of the aforementioned condensation control device 10 for a fresh-keeping refrigerator in a refrigerator. The prepared condensation control device 10 for a fresh-keeping refrigerator is installed in a refrigerator fresh-keeping drawer. The condensation control device 10 for a fresh-keeping refrigerator with an extension 102 is used to perform multi-stage combined condensation control. The prepared composite material is assembled in different sizes and condensation-prone areas. The relative humidity, condensation amount, and moisture loss rate under humidity load are tested within the fresh-keeping drawer. The specific method is as follows: Vegetables with a high moisture content (greater than 92%) are evenly distributed at a rate of 30 g / L (simulating a humidity load) in a fruit and vegetable fresh-keeping drawer within a certain volume of refrigerator. A temperature and humidity tester is placed in the fresh-keeping drawer. The fruit and vegetable fresh-keeping drawer is then tested in the cold storage compartment of an air-cooled refrigerator. The average relative humidity within the fresh-keeping drawer is measured over three days. After the three-day test, the condensation amount on the fresh-keeping drawer, the refrigerator inner walls, and the top cover is measured, and the moisture loss rate under humidity load is measured.

[0037] According to the test results, after the condensation control device 10 for a fresh-keeping refrigerator provided by the present invention is installed in the refrigerator fresh-keeping box, the water loss rate is ≤4% in 3 days, the condensation amount is ≤0.3g / L, and the average humidity is ≥95%, which meets the refrigerator fresh-keeping requirements.

[0038] Example 1

[0039] Synthetic fiber non-woven fabric loading surface: hydrophilic acrylic fiber, quantitative 80g / m 21mm thickness. Drainage paper base: 80% bleached softwood sulfate pulp, 20% flax pulp, 0.8% PAE, softwood pulp beating degree 40°SR, flax pulp beating degree 30°SR. Papermaking equipment: Fourdrinier paper machine. Moisture-absorbing and desorption material: A mixed solution of 4% carboxymethyl cellulose and 15% MgCl2, applied single-sidedly and dried at 105°C. The synthetic fiber nonwoven fabric loading surface and drainage paper are hot-pressed at 230°C, 3 MPa, and 2 minutes.

[0040] Example 2

[0041] Synthetic fiber non-woven fabric loading surface: polyester fiber, quantitative 150g / m 2 4mm thickness. Drainage paper base: 75% bleached softwood sulfate pulp, 25% ramie fiber, 1.2% PAE, softwood pulp beating degree 30°SR, ramie pulp beating degree 20°SR. Papermaking equipment: Fourdrinier paper machine. Moisture-absorbing and desorption material: 3% starch and 10% LiCl solution impregnated, dried at 105°C. The synthetic fiber nonwoven loading surface and drainage paper are hot-pressed at 160°C, 2 MPa pressure, and 4 minutes.

[0042] Example 3

[0043] Synthetic fiber nonwoven fabric loading surface: Vinylon fiber, basis weight 100g / m 2 2mm thickness. Drainage paper base: 70% bleached softwood sulfate pulp, 30% bamboo pulp, 1.0% PAE, softwood pulp beating degree 20°SR, bamboo pulp beating degree 30°SR. Papermaking equipment: Fourdrinier paper machine. Desorption material: A mixed solution of 6% PVA and 15% CaCl2, applied single-sidedly and dried at 105°C. The synthetic fiber nonwoven fabric loading surface and drainage paper are hot-pressed at 220°C, 2 MPa, and 2 minutes.

[0044] Example 4

[0045] Synthetic fiber non-woven fabric loading surface: Vinylon fiber, basis weight 120g / m 2 3mm thickness. Drainage paper base: 80% bleached softwood sulfate pulp, 20% cotton pulp, 1.2% PAE, softwood pulp beating degree 15°SR, cotton pulp beating degree 20°SR. Papermaking equipment: Fourdrinier paper machine. Moisture wicking material: A mixed solution of 3% chitosan and 10% LiCl, impregnated and dried at 105°C. The synthetic fiber nonwoven fabric loading surface and drainage paper are hot-pressed at 200°C, 2 MPa, and 4 minutes.

[0046] Condensation test method: The prepared condensation control device 10 for a fresh-keeping refrigerator is installed on the rear wall of the inner cavity of the refrigerator fresh-keeping box. The volume of the fresh-keeping box is 23L, and 690g of spinach is placed in the fresh-keeping box. After being placed in an air-cooled refrigerator at 5°C for 72 hours, the weight of the condensation inside the fresh-keeping box, on the inner wall of the refrigerator, and on the top cover is weighed. The weight of the spinach is measured and the water loss rate is calculated. The humidity conditions in the fresh-keeping box are recorded and the average humidity is calculated.

[0047] Table 1 Comparison of the test results of Examples 1-4 with the target values

[0048]

[0049] It can be seen from Table 1 that the condensation control device 10 for a fresh-keeping refrigerator provided by the present invention can effectively control the amount of condensation in the refrigerator fresh-keeping box.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A condensation control device for a fresh-keeping refrigerator, characterized in that: It comprises drainage paper and a synthetic fiber non-woven fabric loading surface, wherein the synthetic fiber non-woven fabric loading surface is covered on the surface of the drainage paper; Wherein, the drainage paper comprises a drainage paper base paper and a moisture absorption and desorption material, and the drainage paper base paper and the moisture absorption and desorption material are combined by an impregnation process or a coating process; The condensation control device for a fresh-keeping refrigerator comprises a main body and a strip-shaped extension portion, one end of the extension portion is connected to the main body, and a plurality of the extension portions are spaced apart and arranged around the main body; The drainage paper base paper is made of one or more of bleached chemical wood pulp, hemp pulp, bamboo pulp, and cotton pulp fibers with medium to low beating degrees, with a wet strength agent added, and is made using wet papermaking equipment; wherein the wet strength agent is one or more of polyamide epichlorohydrin and melamine formaldehyde resin, and the mass of the wet strength agent is 0.5-1.5% of the absolute dry fiber mass; The moisture absorption and desorption material includes a hydrophilic polymer and a water-soluble inorganic salt; wherein the hydrophilic polymer includes a polysaccharide and / or a polyol, wherein the polysaccharide is one or more of chitosan and its derivatives, starch and its derivatives, nanocellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and sodium alginate, and the polyol is one or more of polyvinyl alcohol, polyethylene glycol, polyether polyol, and polyester polyol. The water-soluble inorganic salt is one or more of a water-soluble salt of lithium, a water-soluble salt of sodium, a water-soluble salt of ammonium, a water-soluble salt of potassium, a water-soluble salt of calcium, a water-soluble salt of magnesium, a water-soluble salt of zinc, a water-soluble salt of aluminum, a water-soluble salt of copper, a water-soluble salt of iron and a water-soluble salt of cesium; The drainage paper and the synthetic fiber non-woven fabric loading surface are combined by hot pressing, wherein the hot pressing temperature is 160-250° C., the pressure is 1-6 MPa, and the duration is 1-10 minutes.

2. The condensation control device for a fresh-keeping refrigerator according to claim 1, characterized in that: The synthetic fiber non-woven fabric loading surface is one or more of hydrophilic acrylic fiber non-woven fabric, polyester fiber non-woven fabric, and vinylon fiber non-woven fabric, and the synthetic fiber non-woven fabric loading surface has a basis weight of 80-150g / m 2 , thickness is 0.5-5mm.

3. The condensation control device for a fresh-keeping refrigerator according to claim 1, characterized in that: The drainage paper base paper has a basis weight of 20-50 g / m 2 , longitudinal tensile strength ≥0.3kN / m.

4. The condensation control device for a fresh-keeping refrigerator according to claim 1, characterized in that: The drainage paper has a water absorption height of ≥45 mm / 2 min and a water absorption capacity of ≥250%.

5. The condensation control device for a fresh-keeping refrigerator according to claim 1, characterized in that: The mass of the moisture absorption and desorption material is 50%-60% of the mass of the drainage paper base.

6. A refrigerator fresh-keeping box, characterized in that: The refrigerator fresh-keeping box has a square inner cavity, and a hole is provided on the rear wall of the inner cavity. At least a part of the condensation control device for the fresh-keeping refrigerator according to any one of claims 1 to 5 covers the hole for exchanging air with the outside.

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