A self-absorbing ice pack with a slit structure
Patent Information
- Application Number
- CN202611057151.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-09
- Publication Date
- 2026-09-18
AI Technical Summary
冰袋通过内部蓄冷材料吸收并储存冷量，使用前经冷冻处理后，可在常温环境中缓慢释放冷量，从而在一定时间内维持局部空间的低温状态，但是，现有技术中往往存在一些问题，如一种新型自吸水冰袋2024113956587，其吸水原理是依靠无纺布面的自然渗水，透水层中的无纺布面大区域暴露，水匀速地通过无纺布进入袋内，缺乏对吸水过程的分阶段调控能力，缺乏速度调控机制，其透水通道单一、吸水比例不可控、吸水量无法精准设定；如一种自吸水冰袋2020227643513，在于限制水的进出速度，而非实现分阶段的速度调控，其透水区面积为第二防水层面积的固定比例(1/3或1/4)，这是一个静态的、固定的面积比例，无论冰袋处于吸水初期还是即将饱和的阶段，透水区的有效透水面积始终保持不变，其限于“如何限制(减少)进出水量”的单一维度——通过减少无纺布层过水面积来实现水流量控制，其无纺布层直接暴露在冰袋外部，这与其他自吸水冰袋一样存在冷冻时冰袋之间结冰粘连的风险，只是通过“减少渗水量”来缓解粘连的折中方案；如一种双面膜压边无纺布自吸水冰袋2023220862848，采用单向透水膜(无纺布)作为吸水通道，水只能通过无纺布从外部单向进入袋内，其依靠无纺布的自然渗水，在整个吸水过程中，透水率基本保持恒定，其存在一个核心的悖论：无纺布是透水膜，是水进入冰袋的唯一通道，通过减小无纺布面积来防止渗水，但无纺布面积越小，透水效率就越低，吸水速度就越慢，其解决思路是在“防止渗水”和“保证吸水效率”之间做折中取舍，而非从根源上同时解决两个问题，一旦吸水效率不足，用户需要将冰袋在水中浸泡更长时间才能吸满水，使用体验受到负面影响，完全不具备动态吸水速度调控能力
[0007]The solution of this invention is achieved through a dynamic process of "bag bulging → pushing non-woven fabric → bonding film → reducing gap area". This technical solution enables speed control and precise water absorption. The gap structure can be an edge-fitting gap structure, an overlapping gap structure, or an open gap structure, which can be selected. During the water absorption process, the internal micro-pressure generated by the bag bulging pushes the inner non-woven fabric to gradually bond with the outer film layer, reducing the effective water-permeable area of the gap, thus achieving a fast initial absorption followed by a slower absorption. Furthermore, the early closure mechanism of the overlapping gaps enables precise water absorption, and the water absorption ratio is controllable. The non-woven fabric is not exposed to the outside, fundamentally eliminating the problem of ice formation and adhesion caused by residual moisture on the non-woven fabric surface. By completely embedding the non-woven fabric and supplementing it with a gap structure design, not only are the adhesion and powder leakage problems caused by exposed non-woven fabric solved at their source, but also, for the first time, active dynamic control of the water absorption behavior of the self-absorbing ice pack is achieved, upgrading the self-absorbing ice pack to an "actively controllable water absorption system".
Smart Images
Figure CN122774789A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ice pack technology, and in particular to a self-absorbing ice pack with a slit structure that allows water to pass through at specific points / areas, reduces the risk of powder leakage, and has the ability to dynamically adjust the water absorption rate. Background Technology
[0002] In existing cold chain transportation, fresh food preservation, medical cooling, and outdoor refrigeration scenarios, ice packs are commonly used as a water-locking and cold-storage energy storage medium to maintain goods in a low-temperature environment during storage and transportation. Ice packs absorb and store cold energy through internal cold-storage materials. After being frozen before use, they can slowly release cold energy at room temperature, thus maintaining a low-temperature state in a localized area for a certain period. However, existing technologies often have some problems. For example, a novel self-absorbing ice pack (2024113956587) relies on the natural seepage of water from the non-woven fabric surface. A large area of the non-woven fabric in the permeable layer is exposed, and water enters the bag at a uniform rate through the non-woven fabric. It lacks the ability to control the water absorption process in stages and lacks a speed control mechanism. The water channel is singular, the water absorption ratio is uncontrollable, and the water absorption volume cannot be precisely set; for example, a self-absorbing ice pack (2020227643513) focuses on limiting the speed of water entering and leaving the container, rather than achieving phased speed control. Its permeable area is a fixed proportion (1 / 3 or 1 / 4) of the area of the second waterproof layer. This is a static, fixed area proportion; regardless of whether the ice pack is in the initial stage of water absorption or nearing saturation, the effective permeable area of the permeable zone remains constant. It is limited to the single dimension of "how to limit (reduce) the amount of water entering and leaving the container"—through... Water flow control is achieved by reducing the water-permeable area of the non-woven fabric layer, which is directly exposed to the outside of the ice pack. Like other self-absorbing ice packs, this carries the risk of ice packs sticking together during freezing. It's a compromise solution that mitigates sticking by "reducing water seepage." For example, a double-sided membrane-sealed non-woven fabric self-absorbing ice pack (2023220862848) uses a one-way permeable membrane (non-woven fabric) as the water absorption channel. Water can only enter the bag from the outside in a one-way direction through the non-woven fabric. Relying on the natural seepage of the non-woven fabric, the water permeability is basically maintained throughout the entire absorption process. The current approach to maintaining a constant absorbency presents a core paradox: the non-woven fabric, being a permeable membrane, is the only channel through which water enters the ice pack. Reducing the non-woven fabric area helps prevent seepage, but a smaller area results in lower permeability and slower absorption. The current solution is a compromise between preventing seepage and ensuring absorption efficiency, rather than addressing both issues simultaneously. Insufficient absorption means users need to soak the ice pack for a longer time to fully absorb water, negatively impacting the user experience and lacking any dynamic absorption speed control. This invention aims to solve these problems by providing a self-absorbing ice pack with a slit structure. Summary of the Invention
[0003] To address the aforementioned issues, this invention achieves a functional upgrade at the technical principle level. It employs a slit structure on the outer film layer, using the edge slits to dynamically control the "fast-then-slow" water absorption speed: when the ice pack is not absorbing water, the edge slits are not closed; during absorption, the internal micro-pressure generated by the bag's bulge pushes the inner non-woven fabric to gradually adhere to the outer film layer, reducing the effective water-permeable area of the slits, thus achieving the "fast-then-slow" absorption speed. Furthermore, the early closure mechanism of the overlapping slits enables precise water control, making the water absorption ratio controllable. This invention achieves "how to actively..." The multi-dimensional upgrade of "dynamically controlling the water absorption speed and endpoint" reflects the technological leap from "passive quantitative" to "active controllable". The invention lays the non-woven fabric completely inside the outer film layer, so that the non-woven fabric is not exposed to the outside, thus eliminating the problem of freezing and sticking caused by residual moisture on the surface of the non-woven fabric. The inner non-woven fabric is laid inside the outer film layer, completely covering the cavity, which plays the role of preventing the leakage of water-absorbing resin powder. The non-woven fabric is covered by the outer film layer on the inside, which greatly reduces the risk of powder leakage. The structural design completely solves the problems of adhesion and powder leakage.
[0004] The technical solution adopted in this invention is:
[0005] The self-absorbing ice pack with a slit structure includes an outer film layer, an inner non-woven fabric layer, and absorbent resin filling the cavity between the outer film layer and the inner non-woven fabric layer. The inner non-woven fabric layer is configured to gradually adhere to the outer film layer when the ice pack absorbs water and inflates. The slit structure is located on the outer film layer and has a length equal to the length of the ice pack in the same direction. The slit structure can be an edge-fitting slit structure, an overlapping slit structure, or an open slit structure. The edge-fitting slit structure has an upper edge and a lower edge, which overlap and are not sealed to form a slit. The width of the edge-fitting slit is 0.1-0.5 mm. The overlapping slit structure is formed by two films partially overlapping to form an overlapping area. The width of the overlapping area is greater than 0.1 mm. During the process of the ice pack absorbing water and inflating, the overlapping area can close in advance before the ice pack is completely full. The open slit structure is a slit opened on the outer film layer. It remains open when the ice pack is not absorbing water. The width of the open slit structure is greater than 0.1 mm. The edges of the inner nonwoven fabric are heat-sealed to the outer film layer on both sides, or one edge of the inner nonwoven fabric is heat-sealed to the slit-structured side of the outer film layer. The outer film layer is made of low-temperature resistant polyethylene (PE) film with a thickness of 0.08-0.12 mm. The inner nonwoven fabric is made of hydrophilic nonwoven fabric with a thickness of 0.1-0.15 mm, and is connected to the outer film layer by a heat-sealing process. The absorbent resin is superabsorbent polymer (SAP), quantitatively filled into the cavity according to a designed absorbency ratio of 80-120 times.
[0006] The beneficial effects of this invention are:
[0007] The solution of this invention is achieved through a dynamic process of "bag bulging → pushing non-woven fabric → bonding film → reducing gap area". This technical solution enables speed control and precise water absorption. The gap structure can be an edge-fitting gap structure, an overlapping gap structure, or an open gap structure, which can be selected. During the water absorption process, the internal micro-pressure generated by the bag bulging pushes the inner non-woven fabric to gradually bond with the outer film layer, reducing the effective water-permeable area of the gap, thus achieving a fast initial absorption followed by a slower absorption. Furthermore, the early closure mechanism of the overlapping gaps enables precise water absorption, and the water absorption ratio is controllable. The non-woven fabric is not exposed to the outside, fundamentally eliminating the problem of ice formation and adhesion caused by residual moisture on the non-woven fabric surface. By completely embedding the non-woven fabric and supplementing it with a gap structure design, not only are the adhesion and powder leakage problems caused by exposed non-woven fabric solved at their source, but also, for the first time, active dynamic control of the water absorption behavior of the self-absorbing ice pack is achieved, upgrading the self-absorbing ice pack to an "actively controllable water absorption system". Attached Figure Description
[0008] The following description, in conjunction with the figures of the present invention, further illustrates the following:
[0009] Figure 1 This is a schematic diagram of the seam structure of the edge trim;
[0010] Figure 2 This is a schematic diagram of an overlapping gap structure;
[0011] Figure 3 This is a schematic diagram of the slit structure;
[0012] Figure 4 This is a schematic diagram showing the edge of the inner nonwoven fabric being heat-sealed to the outer film layer.
[0013] In the figure, 1. outer film layer, 2. inner non-woven fabric, 3. cavity, 4. absorbent resin, 5. slit structure, 6. first heat seal, 7. second heat seal. Detailed Implementation
[0014] like Figure 1 This is a schematic diagram of the seam structure of the edge, which is a longitudinal section diagram. The seam of the edge seam structure 5 has an upper edge and a lower edge. The seam is formed by the overlapping of the upper and lower edges without sealing. The gap width of the edge seam is 0.1-0.5mm.
[0015] like Figure 2This is a schematic diagram of an overlapping gap structure, shown in a longitudinal section. The edges of the inner nonwoven fabric 2 are heat-sealed to the outer film layer 1 on both sides. The overlapping gap structure 5 is formed by the partial overlap of two film layers to create an overlapping area. The width of this overlapping area is greater than 0.1 mm. During the process of the ice pack absorbing water and inflating, the overlapping area can close in advance before the ice pack is completely full. Through the first heat-sealing point 6, the edges of the inner nonwoven fabric 2 are heat-sealed to the outer film layer 1 on both sides, so that the inner nonwoven fabric 2 is sandwiched between the upper and lower outer film layers 1. This is suitable for any gap structure.
[0016] like Figure 3 This is a schematic diagram of the slit structure, which is a longitudinal section diagram. The slit structure 5 is a slit made on the outer film layer 1, which remains open when the ice pack is not absorbing water. The slit width of the slit structure 5 is greater than 0.1 mm.
[0017] like Figure 4 This is a schematic diagram of the edge of the inner nonwoven fabric 2 being heat-sealed to the outer film layer. It is a longitudinal cross-sectional view. Through the first heat-sealing point 6, the edge of the inner nonwoven fabric 2 is heat-sealed to the side of the outer film layer 1 with the slit structure 4, which is applicable to any slit structure. Through the second heat-sealing point 7, the upper and lower layers of the outer film layer 1 are heat-sealed together to seal the upper and lower layers of the outer film layer 1, forming a cavity 3.
[0018] The outer film layer 1 is made of low-temperature resistant polyethylene (PE) film with a thickness of 0.08-0.12mm; the inner non-woven fabric 2 is made of hydrophilic non-woven fabric with a thickness of 0.1-0.15mm, and is connected to the outer film layer 1 by heat sealing process; the water-absorbing resin 4 is superabsorbent polymer (SAP), which is quantitatively filled into the cavity 3 at a water absorption ratio of 80-120 times.
[0019] This invention employs a simple design consisting of a single waterproof layer, an inner non-woven fabric layer, and a slit structure. The slit structure 5 is only placed on the outer film layer of the waterproof layer, and the inner non-woven fabric 2 serves as a leak-blocking layer. It has only two functional layers: the outer film layer (waterproof) and the inner non-woven fabric layer (leak-blocking), making the structure more streamlined. The width, position, and form of the slits can be adjusted in multiple dimensions, making the permeable area flexible and controllable. By selecting the water absorption path, the expansion uniformity of the water-absorbing resin can be optimized as needed.
[0020] Adjustable speed: By selecting different gap structures such as edge-fitting, overlapping, or slit, or by adjusting the gap width, different water absorption speed curves can be achieved.
[0021] Controllable ratio: Adjust the width of the overlapping area of the gap structure to precisely control the target water absorption ratio.
[0022] Scenario adaptation: One product can meet the needs of various usage scenarios with different water absorption requirements.
[0023] Uniform water absorption: By designing the position and combining the number of slits, a more uniform distribution of water-absorbing resin expansion can be achieved.
[0024] The specific structure of this embodiment is as described in the above technical solution and will not be repeated here.
Claims
1. A self-absorbing ice pack with a slit structure, comprising an outer film layer (1), an inner non-woven fabric layer (2), and absorbent resin (4) filling a cavity (3) between the outer film layer (1) and the inner non-woven fabric layer (2), characterized in that, The inner nonwoven fabric (2) is designed to gradually adhere to the outer film layer (1) when the ice pack absorbs water and bulges up; the slit structure (5) is provided on the outer film layer (1) and its length is equal to the length of the ice pack in the same direction. The slit structure (5) is an edge-fitting slit structure, an overlapping slit structure, or an open slit structure. The slit of the edge-fitting slit structure (5) has an upper edge and a lower edge, which are overlapped and not sealed to form a slit; the overlapping slit structure (5) is formed by the partial overlap of two film pieces to form an overlapping area. The width of the overlapping area is greater than 0.1 mm. The overlapping area can close in advance before the ice pack is fully saturated during the process of the ice pack absorbing water and bulging up; the open slit structure (5) is a slit opened on the outer film layer (1) and remains open when the ice pack does not absorb water.
2. The self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The gap width of the slit structure (5) is greater than 0.1 mm.
3. The self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The edges of the inner nonwoven fabric (2) are heat-sealed to the outer film layer (1) on both sides.
4. A self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The edge of the inner nonwoven fabric (2) is heat-sealed to the side of the outer film layer (1) with a slit structure (5).
5. A self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The outer film layer (1) is made of low-temperature resistant polyethylene (PE) film with a thickness of 0.08-0.12 mm.
6. A self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The inner nonwoven fabric (2) is made of hydrophilic nonwoven fabric with a thickness of 0.1-0.15mm, and is connected to the outer film layer (1) by heat sealing process.
7. A self-absorbing ice pack with a slit structure according to claim 1, characterized in that, The superabsorbent polymer (4) is a superabsorbent polymer (SAP) and is quantitatively filled into the cavity (3) according to a design absorption ratio of 80-120 times.