Valley point-to-peak point stress attenuation wet cavity-to-dry cavity transition sealing structure

Abstract

The utility model provides a valley point to peak point stress attenuation wet cavity to dry cavity transition sealing structure, which belongs to the field of hygienic products, and comprises a combination part arranged in a packaging bag, and the combination part divides the packaging bag into a non-woven fabric cavity and a liquid cavity; the top point, close to the non-woven fabric cavity, of the combination part is defined as a valley point, and the top point, close to the liquid cavity, of the combination part is defined as a peak point; when the liquid cavity is squeezed, liquid breaks through a valley point located at a stress concentration point, and then the breakthrough opening extends towards a peak point along the combination part so as to reduce force needed for squeezing the packaging bag. Due to the fact that the wave-shaped or sawtooth-shaped combination portion is arranged, stress is mainly concentrated on a valley point or a peak point in the squeezing process, due to the fact that the squeezing position is the liquid cavity, liquid can easily break through the valley point to enter the non-woven fabric cavity, and when the valley point is broken through, a breakthrough opening extends towards the peak point along the combination portion and breaks through the peak point.

Description

A stress attenuation structure from valley point to peak point, transition sealing structure from wet cavity to dry cavity Technical Field

[0001] This utility model relates to the field of hygiene products technology, specifically to a stress attenuation structure from valley point to peak point, and a transition sealing structure from wet cavity to dry cavity. Background Technology

[0002] As a disposable hygiene product, wet wipes have become indispensable in people's daily lives. To meet people's increasingly detailed, scenario-specific, and diverse needs, functional wet wipes have emerged in large numbers, ranging from kitchen wipes to shoe-shining wipes; from winter down jacket wipes to summer cooling wipes. Currently, cooling wipes, due to the cooling effect provided by added cooling agents, are gradually being accepted by more consumers. Most existing cooling wipes on the market are in the form of roll film wrapped around non-woven fabric containing added liquid, packaged as single or multiple wipes, and sealed with three or four sides.

[0003] Most current cooling wipes come in roll film wrapped around non-woven fabric containing added liquid. During production, the non-woven fabric is folded and cut, then liquid is added according to a predetermined wet-dry ratio, and finally packaged. The non-woven fabric used in cooling wipes is a twin-spun material, with a sandwich structure consisting of two layers of PP meltblown fabric sandwiching a layer of PP and wood pulp fibers. Currently packaged cooling wipes take at least a week to reach the consumer. During this time, the cooling agents and liquid in the solution seep into the wood pulp fibers. When used, some of the liquid is absorbed by the fibers and difficult to squeeze out, significantly reducing the wipe's moisturizing and cooling effect.

[0004] To address the aforementioned issues, existing technologies have developed cooling wipe packaging bags that separate dry and wet components. These bags have at least one joint in the middle or at another location, dividing the bag into two or more chambers. The non-woven fabric and the liquid are placed in separate chambers. During use, the liquid is squeezed through the joint to enter the non-woven fabric chamber, thus achieving a more pronounced cooling and moisturizing effect.

[0005] However, some problems were also found during use of the dry and wet separation packaging bags. The purpose of the joint of the dry and wet separation packaging bags is to separate the chambers. In order to ensure the separation effect, the width of the joint should not be too narrow to prevent the joint from cracking prematurely. However, this has created a new problem, that is, when squeezing the packaging bag, a lot of force is required to break the joint and allow the liquid to flow into the non-woven fabric chamber, resulting in a poor user experience.

[0006] Utility model patent application number 2022212026638 discloses a dry and wet separation disinfectant wipe packaging bag. This solution achieves dry and wet separation of the wipes by setting a heat-pressed isolation strip (equivalent to a joint), which improves the disinfection effect of the disinfectant wipes. In order to reduce the force required to squeeze open the packaging bag, this solution sets a squeezing breakthrough part on the heat-pressed isolation strip. The width of the squeezing breakthrough part is smaller than the width of the heat-pressed isolation strip, so that the liquid can more easily break through the squeezing breakthrough part and enter the non-woven fabric cavity from this position, thereby reducing the force required to squeeze the packaging bag and lowering the threshold for use.

[0007] The aforementioned utility model patent utilizes the principle of stress concentration guidance, setting a structural defect, such as a thinning area, at a certain point in the joint, so that the stress at this point is much higher than that in other areas during extrusion, causing it to break first and form a breakthrough point. Subsequently, the crack extends along the joint, transforming the one-time breakthrough of the overall adhesive force into a process of breaking at the breakthrough point first and then expanding as a whole, thereby reducing the peak force during extrusion.

[0008] However, the extrusion-break section also has some obvious drawbacks. During storage, the wipes may break prematurely due to compression or transportation vibration (especially during express delivery), causing liquid leakage. The liquid enters the non-woven fabric cavity in advance, reducing the resistance to accidental contact. In addition, in terms of production and processing, the extrusion-break section makes hot pressing more difficult. The space corresponding to the extrusion-break section of the hot pressing component is narrow, and the equipment needs to run continuously at high speed. If the heat is not replenished in time (the hot pressing component does not reach the set temperature) or the pressing force is insufficient, the pressing may not be in place, resulting in a decrease in the yield of packaging bags. Summary of the Invention

[0009] This invention provides a stress attenuation structure from valley point to peak point, and a transition sealing structure from wet cavity to dry cavity, to solve the technical problems in the prior art.

[0010] To solve the above problems, the stress attenuation structure from valley point to peak point and the transition sealing structure from wet cavity to dry cavity provided by this utility model adopts the following technical solution: it includes a joint set inside the packaging bag, which divides the packaging bag into a non-woven fabric cavity and a liquid cavity;

[0011] The joint is wavy or sawtooth-shaped, and the apex of the joint near the nonwoven fabric cavity is defined as the valley point, and the apex of the joint near the liquid cavity is defined as the peak point. This is so that when the liquid cavity is squeezed, the liquid first breaks through the valley point, which is the stress concentration point, and the breakthrough point extends along the joint towards the peak point, thereby reducing the force required to squeeze the packaging bag.

[0012] As a further improvement, the number of valley points and peak points is at least two.

[0013] As a further improvement, the number of valley points and peak points is less than ten.

[0014] As a further improvement, the width of the joint is 4-6 mm.

[0015] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0016] This invention, by setting a wavy or sawtooth joint, ensures that the stress is mainly concentrated at the valley point or peak point during extrusion. Since the extrusion location is a liquid cavity, the liquid can more easily break through from the valley point into the nonwoven fabric cavity. At the same time as breaking through the valley point, the breakthrough extends along the joint towards the peak point and breaks through the peak point.

[0017] This invention utilizes the principle of stress concentration guidance, causing the joint to break first at a local point and then expand as a whole, thus reducing the force required to break through the joint.

[0018] In addition, although the force required to break through the joint of this utility model is slightly greater than that of the structure with the extrusion breakthrough part, its stability is relatively better, which greatly reduces the problem of liquid seeping into the nonwoven fabric cavity in advance during transportation.

[0019] The structure used in this invention does not require additional customized coating equipment and has a relatively higher yield rate, resulting in a slightly lower overall production cost compared to packaging bags with extrusion punctures. Attached Figure Description

[0020] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0021] Figure 1 is a schematic diagram of the transition sealing structure from the valley point to the peak point stress attenuation wet cavity to the dry cavity of this utility model.

[0022] Figure 2 is an enlarged view of part A in Figure 1.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Liquid cavity; 2. Joint; 3. Non-woven fabric cavity. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In existing technologies, wet and dry separation wipes packaging bags require considerable force to force the liquid through the joint and into the non-woven fabric cavity during use. To address this issue, existing technologies disclose a solution by incorporating a compression perforation section to reduce the compression difficulty. However, this solution also has some drawbacks. On one hand, the compression perforation section can easily lead to premature liquid seepage into the non-woven fabric cavity during transportation of some wet and dry separation wipes packaging bags. On the other hand, the compression perforation section requires high-precision heat sealing equipment (such as heat sealing equipment with more precise temperature and pressure control), resulting in a lower yield rate compared to ordinary packaging. Furthermore, current production line heat sealing equipment often falls short of this requirement, necessitating custom-made equipment, which in turn increases the cost of packaging bags with compression perforations.

[0027] To address the aforementioned issues, this invention improves the joint of existing wet and dry separation wipe packaging bags. The joint is changed from a straight structure to a wavy (or serrated) shape. This way, during compression, stress is mainly concentrated at the trough or peak. Since the compression point is the liquid cavity, the liquid can more easily break through from the trough and enter the non-woven fabric cavity. Simultaneously, as it breaks through the trough, the break extends along the joint towards the peak, eventually breaking through the peak as well. The joint first breaks at a localized point and then expands as a whole, reducing the force required to break through the joint.

[0028] Furthermore, this invention does not require the introduction of new hot pressing equipment; only the corresponding components need to be adjusted.

[0029] After introducing the basic principles of this utility model, various non-limiting embodiments of this utility model are described in detail below. Any quantity of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0030] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0031] Example 1 of the valley-to-peak stress attenuation wet-to-dry transition sealing structure provided by this utility model:

[0032] As shown in Figures 1 and 2, the stress attenuation from valley point to peak point, wet cavity to dry cavity transition sealing structure includes a joint 2 set inside the packaging bag. The joint 2 divides the packaging bag into a non-woven fabric cavity 3 and a liquid cavity 1. The non-woven fabric is folded into a square or other shape and placed in the non-woven fabric cavity 3. The liquid cavity 1 is used to store the wet wipe liquid with added cooling factor.

[0033] In this embodiment, the joint 2 is wavy. The apex of the joint 2 near the nonwoven fabric cavity 3 is defined as the valley point, i.e., point B in Figure 2, and the apex of the joint 2 near the liquid cavity 1 is defined as the peak point, i.e., point E in Figure 2. This is so that when the liquid cavity 1 is squeezed (squeezing the nonwoven fabric cavity 3 may cause deformation of the nonwoven fabric, so the liquid cavity 1 is generally squeezed in use), the liquid first breaks through the valley point, which is the stress concentration point, and the breakthrough point then extends along the joint 2 towards the peak point, thereby reducing the force required to squeeze the packaging bag. During the squeezing process, the force on the valley point is 1.1-2 times greater than the force on the peak point, and will not exceed 2 times, making it easier for the liquid to break through the joint 2 from the valley point.

[0034] In this embodiment, there are two valley points and two peak points. In other embodiments, the number of valley points and peak points generally does not exceed ten. If the number of valley points and peak points is too small, it indicates that the joint 2 is close to a straight line, making it difficult to achieve the purpose of stress concentration. At the same time, due to the limitations of the joint width and the size of the packaging bag, the number of valley points and peak points should not be too large.

[0035] In this embodiment, the width of the joint 2 is 5mm to ensure that the joint 2 can play a good separating role.

[0036] Example 2 of the valley-to-peak stress attenuation wet-to-dry transition sealing structure provided by this utility model:

[0037] Its main difference from Example 1 is:

[0038] In Example 1, the joint 2 is wavy.

[0039] In this embodiment, the joint 2 is serrated. The stress concentration of the serrated joint 2 is more obvious, mainly concentrated at the tip of the serrations. Therefore, it is easier to break through the joint 2 during use. However, correspondingly, liquid may seep out from the tip of the serrations during transportation.

[0040] While this specification has shown and described numerous embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover the modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A stress attenuation transition sealing structure from valley point to peak point, wet cavity to dry cavity, comprising a joint (2) disposed within a packaging bag, the joint (2) dividing the packaging bag into a non-woven fabric cavity (3) and a liquid cavity (1); characterized in that, The joint (2) is wavy or sawtooth shaped. The apex of the joint (2) near the nonwoven fabric cavity (3) is defined as the valley point, and the apex of the joint (2) near the liquid cavity (1) is defined as the peak point. This is so that when the liquid cavity (1) is squeezed, the liquid first breaks through the valley point where the stress concentration point is located, and the breakthrough point extends along the joint (2) towards the peak point to reduce the force required to squeeze the packaging bag.

2. The stress attenuation wet-cavity to dry-cavity transition sealing structure according to claim 1, characterized in that: The number of valley points and peak points is at least two.

3. The valley-to-peak stress attenuation wet-cavity-to-dry-cavity transition sealing structure according to claim 1 or 2, characterized in that: The number of valley points and peak points is less than ten.

4. The stress attenuation wet-cavity to dry-cavity transition sealing structure according to claim 1, characterized in that: The width of the joint (2) is 4-6 mm.

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