Self-water-absorption ice bag and preparation method thereof

Abstract

The invention belongs to the technical field of ice bags, and particularly relates to a self-water-absorption ice bag and a preparation method thereof.The self-water-absorption ice bag comprises a bag body, a sheet-shaped porous material and a water absorbent, and one end of the bag body is open; the sheet-shaped porous material is arranged on the inner side of the upper opening of the bag body and matched with the bag body to form a closed space; the water absorbent is arranged in the closed space; during water absorption, water outside the bag body enters the closed space through the sheet-shaped porous material and acts with the water absorbent to form hydrogel. According to the self-water-absorption ice bag, by means of the arrangement that the sheet-shaped material with the holes is installed on the inner side of the opening of the bag body, the water injection speed and the use convenience of the ice bag are greatly improved, the ice bag is not prone to being bonded with other bag bodies in the low-temperature environment, and therefore the problems of tearing and damage caused by interface bonding in the freezing or storing process of the ice bag are solved; meanwhile, the water absorbent is firmly fixed in the closed space, the powder leakage phenomenon is prevented, and the overall safety and controllability of the ice bag are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ice bags, and particularly relates to a self-absorbing ice bag and a preparation method thereof. Background Art

[0002] Ice bags, as a tool widely used in fields such as cold chain storage and transportation, medical care, food preservation, fresh food logistics, and sports rehabilitation, the quality of their performance directly affects the freshness preservation effect of products, the effectiveness of medical care, and the reliability of logistics transportation. With the progress of technology and the change of market demand, ice bag technology has also undergone multiple iterations and improvements. Although certain results have been achieved, there are still significant defects in industrial application scenarios. The specific technical evolution path and defect analysis are as follows:

[0003] The first-generation ice bag technology is also called the basic self-absorbing ice bag, mainly including a bag body, a water injection port, and a water absorbent arranged inside the bag body. When in use, clean water needs to be injected into the ice bag through the water injection port. After the water is mixed with the water absorbent, a hydrogel is formed, thereby realizing the function of adsorbing and locking water. After being cryogenically frozen, an ice bag is formed. For example, a Chinese patent with the publication number CN209819960U discloses such a self-absorbing ice bag, including a bag body, a water injection port channel, and a water absorption strip; a cold storage agent particle is arranged in the bag body, and the cold storage agent particle is a high-molecular water-absorbing material; the front end of the water injection port channel is exposed outside the bag body, and the rest is installed in the bag body; the water absorption strip is made of materials such as cotton, linen, silk, non-woven fabric, paper, and sponge that can automatically absorb water when encountering water. The front end of the water absorption strip is exposed outside the top of the water injection port channel, and the rest passes through the water injection port channel and reaches the bottom inside the bag body and contacts the cold storage agent particles inside the bag body. However, the ice bag of this technology has the following significant technical defects:

[0004] 1) Low water injection efficiency: The water injection process depends on manual operation. The manual water injection speed is slow through a narrow water absorption port. Especially in large-scale production in industrial scenarios, the water injection efficiency is extremely low, resulting in a sharp increase in labor costs. The water injection time for a single bag often exceeds 30 seconds, seriously affecting the production efficiency.

[0005] 2) Easy leakage: Leakage problems are likely to occur at the connection between the water injection port and the bag body and at the water injection port. This not only affects the use effect of the ice bag but also may cause environmental pollution and damage to items.

[0006] 3) Fiber breakage: For ice bags provided with a water absorption strip, the water absorption strip is prone to fiber breakage after long-term soaking, resulting in a decrease in the water inlet rate, further affecting the refrigeration effect and service life of the ice bag.

[0007] The second-generation ice pack technology is also known as the non-woven fabric composite structure ice pack. It adopts an asymmetric structure of non-woven fabric / plastic layer, with non-woven fabric on one side and plastic layer on the other side. This structure improves the water absorption and refrigeration effect of the ice pack to a certain extent, but there are still the following problems:

[0008] 1) Interface adhesion and tearing: On the non-woven fabric side, interface adhesion occurs due to surface frosting in a low-temperature environment. When forcibly separated, the tensile strength of the non-woven fabric is insufficient, resulting in tearing of the non-woven fabric side and leakage problems. This not only affects the use effect of the ice pack but also may cause pollution and damage to items.

[0009] 2) The heat-sealed edge is prone to cracking: The heat-sealed edge of the plastic layer is prone to cracking under transportation vibration, resulting in leakage problems during transportation. If the leaking ice pack sticks to the items, it will further increase the risk of item pollution.

[0010] The third-generation ice pack technology is also known as the improved composite structure ice pack. It is an improvement based on the second generation, mainly by reducing the area of the non-woven fabric to reduce the adhesion probability between ice packs. For example, Chinese patents with publication numbers CN118975886A, CN213599629U, and CN220771465U disclose double-sided film-pressed edge non-woven fabric self-absorbing ice packs. However, there are still the following problems with this third-generation ice pack:

[0011] 1) The adhesion phenomenon still exists: Although reducing the area of the non-woven fabric reduces the adhesion probability between ice packs, icing adhesion still occurs in key contact areas (such as the central water-permeable surface), affecting the use effect and aesthetics of the ice pack.

[0012] 2) Micro-leakage problem: Stress concentration is prone to occur at the interface of the water-permeable layer / waterproof layer under low-temperature shrinkage, resulting in micro-leakage. This not only affects the refrigeration effect and service life of the ice pack but also may cause item pollution.

[0013] The fourth-generation ice pack technology is also known as the micro-porous breathable ice pack. It forms micron-level water-permeable channels in the plastic layer of the bag body through laser / mechanical punching. This structure improves the water absorption speed and refrigeration effect of the ice pack to a certain extent, but there are still the following problems:

[0014] 1) Slow water absorption speed: Due to the limited number of micro-holes, the water absorption speed is relatively slow and cannot meet the demand for rapid refrigeration.

[0015] 2) Powder leakage and water seepage problems: Compared with natural materials, the micro-hole diameters formed by laser / mechanical punching are larger, and powder leakage and water seepage are prone to occur during the water absorption process. This not only affects the use effect and service life of the ice pack but also may cause environmental pollution and item damage.

[0016] 3) Interface adhesion and bag body rupture: Due to the relatively large and unevenly distributed micropore diameters, the ice bag is prone to interface adhesion problems in a low-temperature environment. At the same time, under the stamping action of laser and mechanical force, residual stress concentrates around the holes to form weak points, reducing the tear resistance of the material. When forcibly separating the ice bag, it is easy to cause the bag body to rupture, further exacerbating the risk of leakage and contamination.

[0017] Therefore, the existing ice bag technology still has obvious deficiencies in aspects such as water injection speed, anti-adhesion, anti-rupture, and anti-leakage of powder. These problems limit the wide application and development of ice bag technology. There is an urgent need for a new type of self-absorbing ice bag structure to solve the above problems in the existing technology and improve the overall performance and usage effect of the ice bag. Summary of the Invention

[0018] In view of this, the present invention aims to solve the technical problems existing in the existing ice bag technology, such as low water injection efficiency, easy leakage, and easy adhesion. The present invention discloses a self-absorbing ice bag and a preparation method. By designing a self-absorbing ice bag including a bag body, a sheet-shaped perforated material, and a water absorbent, and installing the sheet-shaped perforated material inside the open end of the bag body, the water injection efficiency is improved, and at the same time, the risks of leakage and adhesion are reduced.

[0019] To achieve the above object, the technical solution of the present invention is realized as follows:

[0020] A self-absorbing ice bag, comprising:

[0021] A bag body, one end of which is open to form a bag mouth;

[0022] A sheet-shaped perforated material, which is arranged inside the bag body at the bag mouth, and the bag body and the sheet-shaped perforated material cooperate to form a closed space;

[0023] A water absorbent, which is arranged inside the closed space;

[0024] When absorbing water, the water outside the bag body enters the closed space through the sheet-shaped perforated material and reacts with the water absorbent to form a hydrogel.

[0025] Further, a preset distance m is provided between the sheet-shaped perforated material and the end of the bag mouth.

[0026] Further, the bag body is arranged in a rectangle, the bag mouth is arranged at one end in the length direction of the bag body, the total length of the bag body is h, and the projected distance of the sheet-shaped perforated material in the length direction is n, where 0.1h ≤ n ≤ 0.3h and 0 ≤ m ≤ 0.3h.

[0027] Further, the sheet-shaped perforated material is an integral all-perforated material.

[0028] Further, the sheet-like porous material is a single-layer porous material or is composed of multiple layers of porous materials laminated together.

[0029] Further, the bag body includes a first bag film layer and a second bag film layer. The first bag film layer and the second bag film layer form an opening-side bag mouth through a bag film hot-pressing part. The sheet-like porous material includes a first water-permeable sheet and a second water-permeable sheet arranged in a folded shape. One end of the first water-permeable sheet is connected to the first bag film layer, and one end of the second water-permeable sheet is connected to the second bag film layer. The other ends of the first water-permeable sheet and the second water-permeable sheet are connected at the folding part, or multiple folding sheets are arranged between the first water-permeable sheet and the second water-permeable sheet for connection.

[0030] Further, an adhesion structure is provided at the ends of the first bag film layer and the second bag film layer close to the bag mouth, and the adhesion structure is used to adhesively fix the port parts of the first bag film layer and the second bag film layer.

[0031] Further, the first water-permeable sheet includes an adhesion part and a water-passing part, and the adhesion part is adhesively connected to the bag body.

[0032] Further, the adhesion part is arranged in a semi-surrounding shape outside the water-passing part.

[0033] Further, the water-passing part of the sheet-like porous material includes a water-permeable layer and an isolation layer. The water-permeable layer and the isolation layer are arranged in the same layer or are a double-layer composite structure. Among them, the water-permeable layer is prepared from a porous material, and the isolation layer is prepared from a non-porous material.

[0034] The second object of the present application is to disclose a preparation method of a self-absorbing ice bag for preparing the self-absorbing ice bag as described above, including:

[0035] Step S1: Cut the first bag film layer and the second bag film layer, and form a basic frame of the bag body through local heat sealing treatment. Among them, the basic frame of the bag body can accommodate and place a water absorbent.

[0036] Step S2: Place the water absorbent in the basic frame of the bag body, and place the sheet-like porous material at a preset distance m from the top end of the basic frame of the bag body.

[0037] Step S3: Heat seal the bag body again to form an ice bag with an opening on the side of the sheet-like porous material, and a closed space is formed between the sheet-like porous material and the bag body.

[0038] Step S4: Conduct an appearance inspection, and after passing, perform packaging or water absorption and ice making.

[0039] Among them, in step S4 during water absorption for ice making, the ice bags with qualified appearance inspection are placed in an external water source. When the ice bags are immersed in water or in direct contact with the water source, the external water source enters the closed space inside the ice bag through the pore paths of the sheet-like perforated material arranged at the inner side of the open mouth of the bag body, and quickly combines with the water absorbent to form a gel. Subsequently, under low-temperature conditions, the water molecules inside the ice bag condense into ice cubes.

[0040] Compared with the prior art, the self-absorbing ice bag and its preparation method described in the present invention have the following advantages:

[0041] 1. For the self-absorbing ice bag described in the present invention, relying on the high-efficiency permeability of the sheet-like perforated material and the rapid adsorption ability of the water absorbent, the water injection speed and the convenience of use of the ice bag are greatly improved. At the same time, the sheet-like perforated material is installed on the inner side of the open mouth of the bag body, and it is not easy to adhere to other bag bodies in a low-temperature environment, thus avoiding the problems of tearing and damage caused by interfacial adhesion during freezing or storage of the ice bag, greatly improving the safety and stability of the ice bag during transportation and use. In addition, the water absorbent is firmly fixed in the closed space and will not leak out with the water during water injection or movement, thus preventing the occurrence of powder leakage phenomenon, protecting the refrigerated items from being contaminated by the water absorbent, and also improving the overall safety and controllability of the ice bag.

[0042] 2. The self-absorbing ice bag described in the present invention solves the problems existing in traditional ice bags, such as slow water absorption speed, powder leakage, water seepage, and easy adhesion. The structure is ingenious, simplifies the use steps of the ice bag, and improves the overall performance and use effect of the ice bag.

[0043] 3. For the preparation method of the self-absorbing ice bag described in this application, during the process of water absorption for ice making, only the ice bags with qualified appearance inspection need to be put into an external water source, and the water source will quickly enter the closed space through the pores of the sheet-like perforated material, combine with the water absorbent to form a gel, and then under low-temperature conditions, the water molecules inside the bag body will condense into ice cubes, thus completing the whole process of preparation and use of the self-absorbing ice bag. The steps are simple, the operation is convenient, the cost is low, it is suitable for large-scale industrial production, and can meet the needs of ice bags in different fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a perspective structural schematic diagram of the self-absorbing ice bag described in the embodiment of the present invention;

[0045] Figure 2 is a structural schematic diagram of the bag mouth side of the self-absorbing ice bag described in the embodiment of the present invention;

[0046] Figure 3 is an exploded structural schematic diagram of the self-absorbing ice bag described in the embodiment of the present invention;

[0047] Figure 4Schematic diagram of the partial cross-section structure of the self-absorbing ice bag described in the embodiment of the present invention when not absorbing water;

[0048] Figure 5 is Figure 4 Schematic diagram of the structure shown in after absorbing water and cooling to make ice cubes;

[0049] Figure 6 is Figure 4 Schematic diagram of the structure with an isolation sheet provided on the bag mouth side of the structure shown in ;

[0050] Figure 7 is Figure 4 Schematic diagram of the structure with an adhesion structure provided on the bag mouth side of the structure shown in ;

[0051] Figure 8 Schematic diagram of the first structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0052] Figure 9 Schematic diagram of the second structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0053] Figure 10 Schematic diagram of the third structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0054] Figure 11 Schematic diagram of the fourth structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0055] Figure 12 Schematic diagram of the fifth structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0056] Figure 13 Schematic diagram of the sixth structure of the water-passing part in the sheet-like porous material described in the embodiment of the present invention;

[0057] Figure 14 Schematic diagram of the structure of the water-permeable sheet in the sheet-like porous material described in the embodiment of the present invention;

[0058] The marks in the figure are indicated as:

[0059] 1 - Bag body; 101 - Bag mouth; 102 - First bag film layer; 103 - Second bag film layer; 104 - Closed space; 105 - Bag film hot-pressing part; 106 - Isolation sheet; 107 - Adhesion structure; 2 - Sheet-like porous material; 201 - First water-permeable sheet; 202 - Second water-permeable sheet; 203 - Water-permeable layer; 204 - Isolation layer; 205 - Bonding part; 206 - Water-passing part; 207 - Composite layer; 2071 - Water-passing hole; 3 - Water absorbent; 4 - Ice cube. Detailed implementation manners

[0060] The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0061] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, rather than intending to limit the exemplary embodiments of the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0062] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and do not limit the number of objects. For example, the first object may be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0063] It should be noted that in the description of the present application, the orientation or positional relationships indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0064] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0065] As Figures 1 - 6 shown, the present invention discloses a self-absorbing ice bag, comprising

[0066] a bag body 1 with one end open to form a bag mouth 101;

[0067] a sheet-like porous material 2 disposed inside the bag body 1 at the bag mouth 101, and the bag body 1 and the sheet-like porous material 2 cooperate to form a closed space 104;

[0068] an absorbent 3 disposed inside the closed space 104;

[0069] When absorbing water, the water outside the bag body 1 enters the closed space 104 through the sheet-like porous material 2 and reacts with the absorbent 3 to form a hydrogel.

[0070] The present application discloses a self-absorbing ice pack, which mainly includes three core components: a bag body 1, a sheet-shaped perforated material 2, and a water absorbent 3. The bag body 1 is made of a polymer material with good sealing performance and low-temperature resistance, and can maintain a stable structure in a low-temperature environment. The sheet-shaped perforated material 2 is installed on the inner side of the open mouth of the bag body 1 and cooperates with the bag body 1 to form a closed space 104. External moisture can quickly penetrate through the pores of this material to the area where the water absorbent 3 is located. After absorbing moisture, the water absorbent 3 will quickly expand to form a hydrogel and firmly lock the moisture. The most core improvement principle of the self-absorbing ice pack described in the present application is to set the sheet-shaped perforated material 2 on the inner side of the open mouth of the bag body 1. The pore path formed by it will not cause moisture leakage under normal conditions. Only when the ice pack is immersed in water or directly in contact with a water source, will the moisture enter the closed space where the water absorbent 3 is located along this pore path and quickly combine with the water absorbent 3 to form a gel. Subsequently, under low-temperature conditions, the water molecules will condense into ice cubes 4. It is precisely due to this clearly defined and complementary structural design that the self-absorbing ice pack does not require manual filling through a traditional narrow water injection port during use. During the water absorption process, no special manual operation is required for the external water source. Just submerge or contact the open part of the ice pack with water to achieve automatic water absorption and gelation, so that this moisture is firmly locked and stably formed during the subsequent freezing process. The entire process utilizes the penetration characteristics of the sheet-shaped perforated material 2 and the strong adsorption capacity of the water absorbent 3. The sheet-shaped perforated material 2 can not only allow moisture to pass through quickly, but also maintain a certain physical isolation effect after water absorption is completed, avoiding adhesion between the bag body and the gel layer. At the same time, the water absorbent 3 will not easily flow or leak after absorbing moisture, making the entire ice pack structure stable. Through this process, the ice pack can form a stable hydrogel structure in a short time, providing sufficient moisture reserve for the subsequent freezing process, while also significantly simplifying the operation process and reducing the risk of human error.

[0071] The self-absorbing ice bag of the present invention significantly improves the water injection speed and convenience of use of the ice bag by virtue of the high permeability of the sheet-like porous material 2 and the rapid adsorption ability of the water absorbent 3. Compared with the traditional ice bag that requires manual filling of water, in this application, the ice bag can quickly absorb the required water by directly contacting the bag mouth 101 with the water source. This not only effectively simplifies the operation process but also avoids the filling difficulties and water leakage risks caused by the narrow water injection port. Especially in industrial and commercial scenarios with large-scale production or frequent use, this self-absorbing function can significantly shorten the water injection time and improve production efficiency. At the same time, the sheet-like porous material 2 is installed inside the open mouth of the bag body 1 and is not easily adhered to other bag bodies 1 in a low-temperature environment, thus avoiding the tearing and damage problems caused by interface adhesion during freezing or storage of the ice bag, greatly improving the safety and stability of the ice bag during transportation and use. In addition, the water absorbent 3 is firmly fixed within the closed space 104 and will not leak out with the water during water injection or movement, thus preventing the occurrence of powder leakage. This not only protects the refrigerated items from being contaminated by the water absorbent but also improves the overall safety and controllability of the ice bag. In addition, the polymer material used for the bag body 1 has excellent low-temperature impact resistance and good sealing performance, ensuring that the ice bag can still maintain its structural integrity after freezing and will not crack or leak due to external force impact or sudden change in environmental temperature, thus providing a reliable and continuous cooling effect for various application scenarios such as fresh food logistics, transportation of medical supplies, and food preservation. It is not prone to leakage pollution or deformation damage during long-term storage and transportation. It is precisely these improvements and optimizations that have comprehensively enhanced the present invention in terms of water injection efficiency, use safety, and cooling performance, providing new ideas for the technological upgrading of the ice bag industry and bringing a more convenient and efficient solution to various transportation and storage occasions that require low-temperature guarantee.

[0072] As a preferred example of this application, the bag body 1 includes a first bag film layer 102 and a second bag film layer 103. The first bag film layer 102 and the second bag film layer 103 form a bag mouth 101 with one side open through the bag film hot pressing part 105. The sheet-like porous material 2 includes a first water-permeable sheet 201 and a second water-permeable sheet 202 arranged in a folded shape. One end of the first water-permeable sheet 201 is connected to the first bag film layer 102, and one end of the second water-permeable sheet 202 is connected to the second bag film layer 103. The other ends of the first water-permeable sheet 201 and the second water-permeable sheet 202 are connected at the folding part or connected to other folded sheets. In the example of this application, the bag body 1 is integrally rectangular. The three ends of the bag body 1 are hermetically connected through the bag film hot pressing part 105 to form a bag mouth 101 on one side in its length direction. Then, the sheet-like porous material 2 is arranged inside the bag mouth 101 to form a closed space 104 for accommodating the water absorbent 3 inside the bag body 1. The sheet-like porous material 2 is designed as a folded structure including at least two water-permeable sheets, such as Figure 3As shown, they are the first water-permeable sheet 201 and the second water-permeable sheet 202 respectively. The first water-permeable sheet 201 and the second water-permeable sheet 202 are integrally connected on the folding side, and the other sides are respectively and hermetically connected to the first bag film layer 102 and the second bag film layer 103, so that when the bag body 1 becomes larger when filled with water, the sheet-like perforated material 2 can still be reliably hermetically connected between the first bag film layer 102 and the second bag film layer 103. Preferably, the sheet-like perforated material 2 may also include a plurality of water-permeable sheets arranged in a folded shape, and one or more other folded sheets are arranged between the first water-permeable sheet 201 and the second water-permeable sheet 202.

[0073] In this application, by optimizing the structures of the bag body 1 and the sheet-like perforated material 2, the bag body 1 is further designed to be composed of a first bag film layer 102 and a second bag film layer 103, and a bag opening 101 with an opening is formed by hot pressing and connecting on one side, so that the water absorbent 3 can be placed inside the bag body 1 to form a closed space 104. The sheet-like perforated material 2 forms a folding structure through the connection between the first water-permeable sheet 201 and the first bag film layer 102 and the connection between the second water-permeable sheet 202 and the second bag film layer 103. When the external water source contacts the bag opening 101, it can quickly penetrate into the interior through the pores of the folding part and react with the water absorbent 3 to undergo an adsorption gel reaction, thereby realizing the functions of automatic water injection and rapid gelation. During this process, the first water-permeable sheet 201 and the second water-permeable sheet 202 are connected at the folding part or connected to other folded sheets, which not only ensures that the sheet-like perforated material 2 can still maintain reliable sealing and fitting when the bag body 1 is inflated with water, but also effectively avoids water loss or leakage of the water absorbent caused by the opening or deformation of the bag opening 101. Furthermore, in a low-temperature environment, the absorbed water is quickly condensed into ice cubes 4, providing continuous and stable cooling conditions for various items that require low-temperature protection. At the same time, there is no need for an independent water injection port that is often provided on traditional ice bags. Just submerging or contacting the bag opening part with the water source can automatically complete water absorption, greatly simplifying the use process and reducing the risk of water leakage.

[0074] As a preferred example of this application, a preset distance m is provided between the sheet-like perforated material 2 and the end of the bag opening 101.

[0075] By setting a preset distance m between the end of the bag mouth and the sheet-like perforated material, the present application optimizes the water flow entry speed and distribution. When the external water source contacts the bag mouth, the water completes a certain degree of deceleration and uniform distribution before entering the sheet-like perforated material, effectively reducing the impact of the water flow on the sheet-like perforated material and the water absorbent. As a result, the water absorbent can come into contact with the water more fully and absorb it evenly during the gelation process, thereby reducing the risk of expansion deformation or damage caused by excessive local water absorption or uneven distribution. In addition, this preset distance m also makes the bag mouth more flexible in actual operation. Users do not need to worry too much about water overflow or difficult water injection due to too strong water flow. They only need to gently touch or partially immerse the bag mouth in the water source to successfully complete the water absorption operation.

[0076] As a preferred example of the present application, the bag body 1 is rectangular, the bag mouth 101 is arranged at one end of the bag body 1 in the length direction, the total length of the bag body 1 is h, and the projected distance of the sheet-like perforated material 2 in the length direction is n, where 0.1h ≤ n ≤ 0.3h and 0.1h ≤ m ≤ 0.3h. This setting defines the positional relationship between the projected distance n of the sheet-like perforated material and the preset distance m between the end of the bag mouth and the sheet-like perforated material and the total length h of the bag body 1 under the condition that the total length of the bag body is h, showing higher water injection efficiency and better stability in practical applications. When n is between 0.1h and 0.3h, the sheet-like perforated material 2 can achieve a balance between efficient water permeability and wide coverage within a limited length range, without causing waste due to too long material or affecting the gelation effect due to too short material. Secondly, the preset distance m is also limited within the range of 0.1h to 0.3h, effectively avoiding the direct impact of water flow caused by the bag mouth 101 being too close to the sheet-like perforated material 2 and preventing the problem of water absorption lag or insufficient absorption due to it being too far away, enabling the water to enter the pore structure of the sheet-like perforated material 2 at an appropriate flow rate and pressure. Therefore, the water absorbent 3 can quickly form a gel and stably lock water in a uniform water distribution environment. In addition, the bag body 1 is made of a polymer membrane material and the three sides are sealed by heat-pressed parts, and one end of the bag mouth 101 is left as a water injection and exhaust channel, which not only improves the tensile and tear resistance of the bag body 1, but also maintains good toughness and sealing performance when the volume expands after water absorption or shrinks after low-temperature freezing, and is not easy to break or leak, further ensuring the safety and reliability of the ice bag during use. Moreover, due to the clear distance limit between the bag mouth 101 and the sheet-like perforated material 2, users do not need to worry about the bag body 1 being damaged or the water absorbent 3 overflowing due to improper operation or too fast water flow in actual operation, thereby significantly increasing the service life and reuse rate of the ice bag. In the example of the present application, m, n, and h have the same dimension. In some examples of the present application, the sheet-like perforated material 2 is arranged at the end of the bag mouth 101, that is, m is approximately equal to 0.

[0077] As a preferred example of the present application, as Figure 7 shown, an adhesion structure 107 is provided at the end of the first bag film layer 102 and the second bag film layer 103 close to the bag mouth 101. The adhesion structure 107 is used to adhesively fix the port portions of the first bag film layer 102 and the second bag film layer 103. As a preferred example of the present application, the adhesion structure 107 is provided at a position close to the middle of the bag mouth 101, and its function is to be able to firmly adhesively fix a part of the ports of the first bag film layer 102 and the second bag film layer 103 together. During the production process of the self-absorbing ice bag, when the first bag film layer 102 and the second bag film layer 103 are hot melt bonded to form the bag body, one end of the opening side forming the bag mouth 101 also forms an adhesion structure 107 through the hot melt process. Such a design not only enables water to conveniently enter the bag during the water absorption process of the ice bag, but also after the ice making is completed, its end can be at least adhesively closed, effectively preventing water from accidentally flowing out during the ice making process, ensuring the smooth progress of the ice making process and preventing the ice bag from adhering at the end during storage, transportation or use.

[0078] As a preferred example of the present application, the sheet-like perforated material 2 is an integral all-perforated material. In the example of the present application, the sheet-like perforated material 2 can be selected from any one of fiber-based porous materials (such as non-woven fabric), polymer porous materials (such as microporous polypropylene film), natural or bio-based porous materials. In the example of the present application, the sheet-like perforated material 2 is selected from any one of non-woven fabric, cotton material, and water-absorbing material. This design makes the sheet-like perforated material 2 a perforated material as a whole, enabling water to quickly enter the closed space 104 where the water absorbent is located through multiple pore channels on the surface and inside of the material after contacting the water source, so as to fully contact the water absorbent 3 and complete the absorption and gelation process in the shortest time. The structure of this integrated perforated material not only makes the diffusion path of water on the surface and inside of the material smoother, but also avoids the possible flow blockage between different materials or different pore diameter regions. In addition, at the production level, using a single type of perforated material can simplify the process flow, because there is no need to process multiple different materials or layers at the same time, and it also reduces the complexity of raw material procurement and quality inspection, thereby reducing production costs and increasing overall production capacity, being more conducive to large-scale industrial manufacturing, and having stronger controllability of product quality.

[0079] As a preferred example of the present application, as Figure 14As shown, the first water-permeable sheet 201 includes an adhesive portion 205 and a water-passing portion 206, and the adhesive portion 205 is adhesively connected to the bag body 1. As a specific example of the present application, the adhesive portion 205 is arranged in a semi-surrounding shape outside the water-passing portion 206. The adhesive portions 205 at both ends in the width direction of the first water-permeable sheet 201 are connected to the bag film hot-pressing portion 105 on the bag body 1, and the adhesive portion 205 between these two ends is adhered to the first bag film layer 102. The second water-permeable sheet 202 has a similar structure to the first water-permeable sheet 201, which will not be elaborated here.

[0080] This setting designs the water-permeable sheet to include two structural parts, namely the adhesive portion 205 and the water-passing portion 206. The adhesive portion 205 is used for tightly adhering to the bag body film layer, and the water-passing portion 206 is used to form the channel structure set for the first water-permeable sheet 201 to enable water to quickly penetrate into the closed space 104. This design enables the water-passing portion 206 to play the role of an unobstructed water absorption channel during water injection, while the adhesive portion 205 forms a reliable sealing area around. When water enters the water-passing portion 206, it quickly combines with the water absorbent 3 to form a hydrogel, and then condenses into ice cubes 4 under low-temperature conditions. The whole process utilizes the stability of the adhesive portion 205 and the high permeability of the water-passing portion 206 to ensure that the water absorbent 3 obtains uniform and sufficient water supply in a short time, and at the same time can effectively prevent the water absorbent 3 or water from leaking to the outside of the bag body. In addition, the semi-surrounding adhesive portion 205 can also play a certain role in protecting and fixing the water-passing portion 206, avoiding problems such as edge warping or detachment of the water-permeable sheet that may occur in the traditional simple fitting method.

[0081] As some examples of the present application, the water-passing portion 206 of the sheet-like perforated material 2 includes a water-permeable layer 203 and a separation layer 204. The water-permeable layer 203 and the separation layer 204 are arranged in the same layer or are a double-layer composite structure. Among them, the water-permeable layer 203 is prepared from a perforated material, and the separation layer 204 is prepared from a non-perforated material.

[0082] This setting designs the water-passing portion 206 of the sheet-like perforated material 2 as a sheet-like structure composed of a water-permeable layer 203 and a separation layer 204. The water-permeable layer 203 and the separation layer 204 can be a single-layer structure or a double-layer composite structure, and different design combinations can be adopted to meet different water absorption and structure strengthening requirements. By adjusting the distribution of the water-permeable layer 203 and the separation layer 204 in the sheet-like perforated material 2 and the porosity of the materials in different regions, the water can be evenly distributed and stably absorbed during the process of entering the ice bag closed space 104.

[0083] In the examples of the present application, as Figure 8 shown, it discloses a structure of the water-passing portion 206. The middle part of the water-passing portion 206 is a separation layer 204 prepared from a non-perforated material, and both sides are water-permeable layers 203 prepared from perforated materials. As Figure 9As shown, it discloses another structure of the water passing part 206. The middle part of the water passing part 206 is a water permeable layer 203 made of porous material, and the two sides are isolation layers 204 made of non-porous material.

[0084] This design makes reasonable use of the different material properties of the middle part and the two side parts. During the water absorption process, it not only ensures that water can quickly penetrate through the porous area into the internal water absorbent 3 area to form a uniform hydrogel structure, but on the other hand, through the setting of the non-porous area, it effectively prevents the problems of excessive local water absorbent load and structural stress concentration caused by excessive water penetration. Thus, it greatly reduces the risk of tearing, breaking or leaking of the ice bag due to external impact or sudden temperature change during repeated use or long-distance transportation.

[0085] In the example of this application, as Figure 10 、 Figure 11 shown, it discloses another two structures of the water passing part 206. The periphery of the water passing part 206 is an isolation layer 204, and the central area of the water passing part 206 is a water permeable layer 203. The water permeable layer 203 can be designed in polygons such as circular, triangular, rectangular, etc. This design realizes the effective division of labor for water entry, absorption and locking by reasonably configuring the relative positions of the perforated area and the non-perforated area. During use, the perforated material in the central area enables the water absorbent 3 to fully contact with water, while the additional support and sealing effect provided by the non-porous material on the periphery effectively reduces the risk of bag rupture and water leakage caused by external impact, low-temperature frost heaving or uneven internal distribution. This structural design not only improves the working efficiency of the ice bag during the water absorption stage but also can maintain the overall physical strength and impact resistance of the ice bag after low-temperature freezing.

[0086] In the example of this application, as Figure 12 shown, it discloses the fifth structure of the water passing part 206. Multiple isolation layers 204 and multiple water permeable layers 203 are arranged on the water passing part 206 in an alternating manner. The multiple water permeable layers 203 arranged in an alternating manner enable water to quickly penetrate and evenly diffuse inside the ice bag, so that the water absorbent 3 can fully react with water to form a homogeneous hydrogel. The alternately arranged isolation layers 204 limit the free flow of water through the non-porous barrier effect, preventing local uneven water absorption, incomplete gelation or ice bag structure damage caused by too strong water flow, and at the same time enhancing the impact resistance and durability of the ice bag during repeated freeze-thaw cycles, transportation and storage.

[0087] As some examples of the present application, the sheet-like perforated material 2 is a single-layer perforated material or is composed of multiple layers of perforated materials laminated together. In the present application, the self-absorbing ice pack mainly relies on the sheet-like perforated material 2 inside the bag body 1. This material can be a single-layer perforated material or composed of multiple layers of perforated materials laminated together. During use, external moisture is quickly absorbed through the tiny holes on the surface of this material and evenly distributed in the closed space 104 to come into full contact with the water absorbent 3 to form a hydrogel structure. When the sheet-like perforated material 2 is a multi-layer composite structure, such as Figure 13 shown, taking the lamination of the first water-permeable sheet 201 and the composite layer 207 as an example, the pore diameter of the water-permeable layer 203 on the first water-permeable sheet is smaller than the water-passing holes 2071 on the composite layer 207. The design with different pore diameters between each composite layer enables each layer to effectively participate in the water absorption process, not only ensuring the rapid conduction and balanced distribution of moisture inside the ice pack, but also providing additional mechanical support by the multi-layer structure to prevent the ice pack from deforming or breaking due to internal pressure changes during water absorption and freezing.

[0088] As some examples of the present application, a separator 106 is provided on the inner side of the first bag film layer 102 and / or the second bag film layer 103. The separator 106 is provided on one side of the sheet-like perforated material 2 close to the opening end of the bag mouth 101. By providing the separator 106 on the outer side of the sheet-like perforated material 2 at the bag mouth 101 in the present application, on the one hand, it is used for guiding the external water flow when it enters the ice pack, ensuring that the moisture evenly penetrates into the closed space through the microporous structure of the sheet-like perforated material 2. On the other hand, it can also form a complete or partial physical barrier at the bag mouth 101 after the water injection is completed, further preventing the ice pack from quickly freezing into ice cubes 4 and adhering to other structures under low-temperature conditions, and at the same time providing additional mechanical support and structural reinforcement for the inside of the ice pack, effectively preventing the risks of bag body deformation, rupture or water leakage caused by local concentration or uneven internal distribution of moisture.

[0089] The self-absorbing ice pack disclosed in the present invention forms a closed space 104 by arranging the sheet-like porous material 2 inside the open mouth of the bag body 1 and cooperating with the bag body 1. This design ingeniously utilizes the permeation characteristics of the sheet-like porous material 2, enabling external water sources to quickly penetrate through the pores of the material to the area where the water absorbent is located without manual operation. After absorbing water, the water absorbent 3 rapidly swells to form a hydrogel and condenses into ice cubes under low-temperature conditions. This process not only greatly simplifies the cumbersome steps of manually filling water in traditional ice packs but also effectively avoids the filling difficulties and water leakage risks caused by the narrow water injection port. At the same time, the sheet-like porous material 2 can maintain a certain physical isolation effect after water absorption, preventing the bag body 1 from adhering to the gel layer. The water absorbent 3 is firmly fixed within the closed space 104 and will not leak out with the water during water injection or movement, avoiding the phenomenon of powder leakage and protecting the refrigerated items from contamination. In the example of this application, the water absorbent is a material that forms a hydrogel when preparing an ice pack in the prior art, and will not be elaborated further here.

[0090] This application also discloses a preparation method of a self-absorbing ice pack, including:

[0091] Step S1: Cut the first bag film layer 102 and the second bag film layer 103, and form the basic framework of the bag body 1 through local heat sealing treatment. Among them, the basic framework of the bag body 1 can accommodate the water absorbent 3;

[0092] Step S2: Place the water absorbent 3 within the basic framework of the bag body 1, and place the sheet-like porous material 2 at a preset distance m from the top of the basic framework of the bag body 1;

[0093] Step S3: Heat seal the bag body 1 again to form an ice pack with an opening on the side of the sheet-like porous material 2, and a closed space 104 is formed between the sheet-like porous material 2 and the bag body 1;

[0094] Step S4: Conduct an appearance inspection, and after passing, perform packaging or water absorption and ice formation;

[0095] Among them, during water absorption and ice formation in Step S4, the ice pack with qualified appearance inspection is placed in an external water source. When the ice pack is immersed in water or in direct contact with the water source, the external water source enters the closed space 104 inside the ice pack through the pore path of the sheet-like porous material 2 arranged at the inner side of the open mouth of the bag body 1 and quickly combines with the water absorbent 3 to form a gel, and then the water molecules inside the ice pack condense into ice cubes 4 under low-temperature conditions.

[0096] The preparation method of the self-absorbing ice bag described in this application first forms the basic framework of the bag body through cutting and local heat sealing treatment. This framework remains relatively closed at one end, providing the basis for the subsequent water absorption and ice making process. Then, the water absorbent is placed inside the basic framework of the bag body. The water absorbent is the key component that enables the ice bag to autonomously absorb water and transform into a gel-like state. Then, a sheet-like perforated material is placed at a preset distance near the top of the bag body. This design allows water to enter the interior of the bag body through its pore path while maintaining the overall seal of the bag body. Then, by heat sealing the bag body again, an ice bag structure with an opening on the side of the sheet-like perforated material is formed. At this time, a closed space is formed between the sheet-like perforated material and the bag body, which is used to accommodate the water absorbent and the subsequently absorbed water as well as the ice cubes formed by the condensation of water molecules.

[0097] During the water absorption and ice making process, just put the ice bag with qualified appearance inspection into an external water source, and the water source will quickly enter the closed space through the pores of the sheet-like perforated material, combine with the water absorbent to form a gel. Then, under low temperature conditions, the water molecules inside the bag body will condense into ice cubes, thus completing the entire preparation and use process of the self-absorbing ice bag, which is very convenient and fast.

[0098] The embodiments of this application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and the features in the embodiments in this application can be combined with each other. This application is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this application, those of ordinary skill in the art can also make many forms without departing from the purpose of this application and the scope protected by the claims, and all belong to the protection scope of this application.

Claims

1. A self-absorbing ice pack, characterized in that, including a bag body (1) with one end open to form a bag mouth (101); a sheet-like perforated material (2) disposed inside the bag body (1) at the bag mouth (101), and the bag body (1) and the sheet-like perforated material (2) cooperate to form a closed space (104); a water absorbent (3) disposed inside the closed space (104); when absorbing water, the water outside the bag body (1) enters the closed space (104) through the sheet-like perforated material (2) and reacts with the water absorbent (3) to form a hydrogel.

2. The self-absorbing ice pack according to claim 1, wherein A preset distance m is provided between the sheet-like perforated material (2) and the end of the bag mouth (101).

3. The self-absorbing ice bag according to claim 2, wherein The bag body (1) is rectangularly arranged, the bag mouth (101) is disposed at one end in the length direction of the bag body (1), the total length of the bag body (1) is h, and the projected distance of the sheet-like perforated material (2) in the length direction is n, where 0.1h ≤ n ≤ 0.3h and 0 ≤ m ≤ 0.3h.

4. The self-absorbing ice pack according to claim 1, characterized in that, The sheet-like perforated material (2) is an integral all-perforated material, or the sheet-like perforated material (2) is a single-layer perforated material or is composed of multiple layers of perforated materials laminated together.

5. The self-absorbing ice pack according to claim 1, characterized in that The bag body (1) includes a first bag film layer (102) and a second bag film layer (103). The first bag film layer (102) and the second bag film layer (103) form a bag mouth (101) with one side open through a bag film hot-pressing part (105). The sheet-like perforated material (2) includes a first water-permeable sheet (201) and a second water-permeable sheet (202) arranged in a folded shape. One end of the first water-permeable sheet (201) is connected to the first bag film layer (102), and one end of the second water-permeable sheet (202) is connected to the second bag film layer (103). The other ends of the first water-permeable sheet (201) and the second water-permeable sheet (202) are connected at the folding part, or a plurality of folding sheets are provided for connection between the first water-permeable sheet (201) and the second water-permeable sheet (202).

6. The self-absorbing ice pack according to claim 5, wherein An adhesion structure (107) is provided at the ends of the first bag film layer (102) and the second bag film layer (103) close to the bag mouth (101), and the adhesion structure (107) is used to adhesively fix the port parts of the first bag film layer (102) and the second bag film layer (103).

7. The self-absorbing ice pack according to claim 6, wherein The first water-permeable sheet (201) includes an adhesive part (205) and a water-passing part (206), and the adhesive part (205) is adhesively connected to the bag body (1).

8. The self-absorbing ice pack according to claim 7, characterized in that, The adhesive part (205) is arranged in a semi-surrounding shape outside the water-passing part (206).

9. The self-absorbing ice pack according to claim 7, wherein, The water-passing part (206) of the sheet-like perforated material (2) includes a water-permeable layer (203) and an isolation layer (204). The water-permeable layer (203) and the isolation layer (204) are arranged on the same layer or are a double-layer composite structure. Among them, the water-permeable layer (203) is prepared from a perforated material, and the isolation layer (204) is prepared from a non-perforated material.

10. A preparation method of a self-absorbing ice pack, characterized in that, For preparing the self-absorbing ice bag according to any one of claims 1 to 9, including: Step S1: Cut the first bag film layer (102) and the second bag film layer (103), and form the basic framework of the bag body (1) through local heat sealing treatment. Among them, the basic framework of the bag body (1) can accommodate the water absorbent (3); Step S2: Place the water absorbent (3) inside the basic framework of the bag body (1), and place the sheet-shaped perforated material (2) at a preset distance m from the top of the basic framework of the bag body (1); Step S3: Heat seal the bag body (1) again to form an ice bag with a side opening of the sheet-shaped perforated material (2), and a closed space (104) is formed between the sheet-shaped perforated material (2) and the bag body (1); Step S4: Conduct an appearance inspection, and after passing, perform packaging or water absorption to make ice; Among them, when making ice by water absorption in Step S4, place the ice bag with qualified appearance inspection in an external water source. When the ice bag is immersed in water or in direct contact with the water source, the external water source enters the closed space (104) inside the ice bag through the pore path of the sheet-shaped perforated material (2) arranged at the inner side of the open mouth of the bag body (1), and quickly combines with the water absorbent (3) to form a gel, and then condenses the water molecules inside the ice bag into ice cubes (4) under low temperature conditions.

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