Dressing for improving extensibility and preparation process therefor
Patent Information
- Application Number
- PCT/CN2025/106341
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-28
- Filing Date
- 2025-06-30
- Publication Date
- 2026-09-03
Smart Images
Figure CN2025106341_03092026_PF_FP_ABST
Abstract
Description
A dressing with improved elasticity and its preparation process
[0001] Cross-reference of related applications
[0002] This application claims priority to Chinese Patent Application No. 2025102363934, filed on February 28, 2025, entitled "A Dressing with Improved Elongation and its Preparation Process", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of wound dressing technology, and in particular to a dressing with improved elasticity and its preparation process. Background Technology
[0004] Wound dressings are mainly used for various exudative wounds to absorb exudate and provide a good healing environment. In the past, self-adhesive wound dressings were often used in wound care. By covering the wound surface with the wound dressing, the wound dressing can absorb the wound exudate.
[0005] Wound dressings typically include an absorbent layer made of non-woven fabric. This non-woven fabric layer diffuses and absorbs exudate, achieving the purpose of absorbing wound exudate. However, the non-woven fabric contains fibers with poor extensibility, resulting in poor overall elasticity of the wound dressing. When the wound dressing is applied to areas subject to high shear stress, such as the knee or elbow, it can lead to reduced comfort or partial slippage. To address this issue, existing wound dressings generally incorporate several seams in the non-woven fabric layer to improve the dressing's elasticity.
[0006] However, existing wound dressings, regardless of the incision design, still have a single absorbent layer. When covering areas that experience high shear stress, such as the knee or elbow, they are prone to reduced comfort or partial detachment of the wound dressing.
[0007] Application content
[0008] The inventors of this application have discovered through dedicated research that the film layer and contact layer constituting the dressing usually have good extensibility, but the overall extensibility becomes worse after the dressing is formed. This is because the fibers constituting the absorbent layer have poor extensibility, causing the film layer and contact layer that are bonded to it to lose their original extensibility.
[0009] This application was made in view of the above findings, and its purpose is to provide a dressing with improved extensibility and its preparation process, so as to solve the technical problem in the prior art that when wound dressings are applied to areas prone to high shear stress, the comfort of application is easily reduced or the wound dressings partially fall off.
[0010] In a first aspect, this application provides a dressing for improving elasticity, comprising a thin film layer, an absorbent layer and a contact layer stacked from top to bottom, wherein the absorbent layer has fibers that all extend along any planar direction;
[0011] The dressing for improving elasticity has several slits that penetrate the absorbent layer along the stacking direction, so that the absorbent layer forms several independent absorbent units that can be separated from each other.
[0012] Optionally, the length of the liquid aspiration unit along its planar direction is set to 2mm to 30mm.
[0013] Optionally, the width of the liquid aspiration unit along its planar direction is set to 2mm to 30mm.
[0014] Optionally, the liquid-absorbing layer further includes a frame surrounding the edge of the liquid-absorbing layer, and a plurality of the liquid-absorbing units are disposed within the frame.
[0015] Optionally, the liquid-absorbing layer further includes a connecting rib, which is formed between the liquid-absorbing unit by cutting through the slit, and the two ends of the connecting rib are respectively connected to the frame.
[0016] Optionally, all the fibers of the absorbent layer extend in the same direction, and the extension direction of the connecting rib is set at an angle to the extension direction of the fibers.
[0017] Optionally, the maximum length of the connecting rib along the extension direction of the fiber is set to 1 mm to 30 mm.
[0018] Optionally, the liquid absorption unit has a plurality of slits formed therein, the slits penetrating the liquid absorption layer along the stacking direction, and the extension direction of the slits is set at an angle to the extension direction of the fibers.
[0019] Optionally, the absorbent layer comprises a superabsorbent nonwoven fabric layer and a spunlace nonwoven fabric layer, wherein the superabsorbent nonwoven fabric layer and the spunlace nonwoven fabric layer are stacked one on top of the other.
[0020] Optionally, the planar shape of the liquid absorption unit can be circular, square, rhomboid, triangular, or hexagonal.
[0021] Optionally, the dressing for improving elasticity further includes a foam layer disposed between the absorbent layer and the contact layer, with a plurality of cuts penetrating the foam layer along the stacking direction to form a plurality of independent foam units that can be separated from each other.
[0022] Optionally, the dressing for improving elasticity further includes a protective layer disposed at the bottom of the contact layer and bonded to the contact layer.
[0023] Secondly, this application also provides a dressing preparation process for manufacturing the above-mentioned dressing with improved elasticity, comprising the following steps:
[0024] Step 1: Stack the superabsorbent nonwoven fabric layer and the spunlace nonwoven fabric layer together to form the liquid-absorbing layer;
[0025] Step 2: Bond the absorbent layer to the contact surface to form the object to be cut;
[0026] Step 3: Place the object to be cut on the cutting platform and convey it to the cutting roller group. The cutter on the cutting roller group cuts the object to be cut, forming several independent and separable liquid absorption units in the liquid absorption layer.
[0027] Step 4: Laminate the film layer, the cut body to be cut, and the protective layer together to form a multi-layer dressing material;
[0028] The process involves cutting and packaging the molded multi-layer dressing material to create a dressing product with improved extensibility.
[0029] Optionally, in step two, the absorbent foam layer is bonded to the body to be cut.
[0030] Compared with the prior art, this application provides a dressing with improved extensibility, comprising a film layer, an absorbent layer, and a contact layer stacked from top to bottom. The absorbent layer has fibers extending along any plane direction. The dressing with improved extensibility has several slits formed, which penetrate the absorbent layer along the stacking direction, so that the absorbent layer forms several independent absorbent units that can be separated from each other. By providing through slits in the absorbent layer, the absorbent layer can be cut into independent absorbent units, thereby cutting the poorly extensible fibers extending along any plane direction of the absorbent layer. This transforms the originally long, poorly extensible fibers of the absorbent layer into short fibers in each independent absorbent unit, thereby releasing the extensibility of the film layer and the contact layer connected to the absorbent layer. This solves the technical problem in the prior art where dressings applied to areas prone to high shear stress easily lead to reduced comfort or partial detachment of the wound dressing. It improves the extensibility of the dressing, ensuring good fit to the body when applied to flexible areas such as elbows and knees, and improving the comfort of the dressing. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0032] Figure 1 is a schematic diagram of the overall structure of the dressing for improving elasticity provided in the embodiment of this application;
[0033] Figure 2 is a plan view of the absorbent layer in the dressing for improving elasticity provided in the embodiment of this application;
[0034] Figure 3 is a schematic diagram showing the stacking relationship between the superabsorbent nonwoven fabric layer and the spunlace nonwoven fabric layer in the embodiments of this application;
[0035] Figure 4 is a schematic diagram showing the stacking relationship between the thin film layer, the liquid-absorbing layer, the contact layer, the foam layer, and the protective layer in an embodiment of this application;
[0036] Figure 5 is a plan view of the absorbent layer in the dressing for improving elasticity provided in the embodiments of this application;
[0037] Figure 6 is a plan view of the absorbent layer in the dressing for improving elasticity provided in the embodiments of this application;
[0038] Figure 7 is a planar structural diagram of the foam layer in the dressing for improving elasticity provided in the embodiments of this application.
[0039] Reference numerals: 100, film layer; 200, absorbent layer; 201, superabsorbent nonwoven fabric layer; 202, spunlace nonwoven fabric layer; 210, slit; 220, absorbent unit; 221, cut; 230, frame; 240, connecting rib; 300, contact layer; 400, foam layer; 410, foam unit; 500, protective layer. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0041] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0043] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0044] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0045] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0046] In conventional dressing preparation, the absorbent layer is typically made of nonwoven fabric. Nonwoven fabric is a type of non-woven material formed by directly using polymer chips, short fibers, or filaments to create a web through airflow or mechanical means, followed by hydroentangling, needle punching, or thermal rolling for reinforcement, and finally finishing processes. Therefore, nonwoven fabrics generally contain relatively long fibers extending along the forming direction. The inventors of this application have discovered that while the film layer and contact layer constituting the dressing usually have good extensibility, the overall extensibility deteriorates after the dressing is formed. This is because the fibers constituting the absorbent layer have poor extensibility, causing the film layer and contact layer to lose their original extensibility. This can be compared to attaching a row of toothpicks between two highly extensible plastic films; the extensibility of the formed product depends on the material with the worst extensibility within the product.
[0047] This application was made in view of the above findings. It adopts a method of cutting the poorly stretchable fibers as short as possible along their fiber extension direction without affecting the actual effectiveness of the dressing, so as to release the stretchability of the film layer and the contact layer, which originally have excellent stretchability, thereby improving the overall stretchability of the dressing.
[0048] Of course, the structural layout of the dressing that improves extensibility in this application is not limited to nonwoven dressings with fibers in only the same direction of extension, but can also be applied to nonwoven fabrics with fibers in multiple directions.
[0049] As shown in Figures 1 and 2, this application provides a dressing for improving elasticity, including a film layer 100, an absorbent layer 200, and a contact layer stacked from top to bottom. The absorbent layer 200 has fibers that extend along any plane direction. A plurality of cuts 210 are formed in the elasticity-enhancing dressing, and the cuts 210 penetrate the absorbent layer 200 along the stacking direction, so that the absorbent layer 200 forms a plurality of independent absorbent units 220, and the absorbent units 220 can be separated from each other.
[0050] That is, the dressing with improved extensibility provided in this application can be cut into independent absorbent units 220 by providing a through cut 210 in the absorbent layer 200. This allows the poorly extensible fibers of the absorbent layer 200 extending in any planar direction to be cut as well, thereby transforming the originally long poorly extensible fibers of the absorbent layer 200 into short fibers in each independent absorbent unit 220. This releases the extensibility of the film layer 100 connected to the absorbent layer 200 and the contact layer itself, solving the technical problem in the prior art that when dressings are applied to areas prone to high shear stress, the comfort of the dressing is easily reduced or the wound dressing falls off. This improves the extensibility of the dressing, ensures good fit to the human body when the dressing is applied to flexible areas such as elbows and knees, and improves the comfort of the dressing.
[0051] Specifically, the elasticity-enhancing dressing provided in this embodiment is generally rectangular and flat. The contact layer is made of silicone material, and uniform through-holes are provided on the silicone contact layer to form a silicone mesh. The adhesive properties of the silicone material allow the dressing to comfortably adhere to the human body. The film layer 100 is specifically made of polyurethane material, is rectangular in shape, and its edges are laminated to the contact layer. The absorbent layer 200 is disposed as a core layer between the film layer 100 and the contact layer. The absorbent layer 200 is specifically made of superabsorbent nonwoven fabric and is generally rectangular and planar. The film layer 100, absorbent layer 200, and contact layer are stacked from top to bottom. A cut 210 penetrates the absorbent layer 200 from the top, completely severing the poorly elastic fibers in the absorbent layer 200 in a vertical direction. In this embodiment, the cut 210 includes two sets of intersecting straight cuts 210, each set of straight cuts 210 including multiple parallel straight cuts 210, thereby cutting the entire absorbent layer 200 into multiple rhomboid absorbent units 220. The fiber length in each absorbent unit 220 is also the maximum straight length of the absorbent unit 220 in the planar direction. This achieves the purpose of shortening the length of the poorly stretchable fibers in the absorbent layer 200, releasing the excellent stretchability of the film and silicone layer itself that are bonded to the absorbent layer 200. Whenever the body part to which the dressing is applied moves, and the dressing is pulled, the film layer 100 and the contact layer will be under tension, thereby causing the absorbent layer 200 to stretch accordingly. At this time, the absorbent units 220 in the absorbent layer 200 will be dispersed or deformed along the hand direction due to the corresponding tension, reducing the resistance generated by the dressing during deformation, thereby preventing the contact layer from excessively pulling on the skin it is bonded to, and also preventing the contact layer from separating from the skin, causing the dressing to fall off.
[0052] Optionally, the cross-sectional shape of the liquid absorption unit 220 extending along the plane of the liquid absorption layer 200 is rhomboid, square, triangular, circular, or hexagonal.
[0053] Specifically, in the above embodiments, the liquid absorption unit 220 is cut into a rhombus shape by a set of intersecting straight cuts 210. In other embodiments of this application, the liquid absorption unit 220 can also be configured into other shapes according to actual production processes and usage requirements. For example, a square liquid absorption unit 220 can be cut into the liquid absorption layer 200 by two sets of intersecting straight cuts 210 with equal spacing. Alternatively, the liquid absorption layer 200 can be cut into hexagonal liquid absorption units 220 by forming a planar honeycomb-like cut 210 with hexagonal cuts 210. Or, multiple circular or triangular liquid absorption units 220 can be cut into the liquid absorption layer 200 by circular or triangular cuts 210. In other embodiments of this application, the liquid absorption unit 220 can also be configured into other irregular shapes.
[0054] The core layer of typical wound dressings is square, with side lengths generally ranging from 2.5cm to 35cm. Theoretically, the denser the incisions 210, the smaller the absorbent units 220 can be cut, resulting in shorter fibers within the absorbent units 220 and better extensibility of the absorbent layer 200. However, due to limitations in the manufacturing process, denser incisions 210 and smaller absorbent units 220 lead to higher production costs. To further ensure that the cut absorbent units 220 can completely cut the poorly extensible fibers in the absorbent layer 200, and to guarantee that the fibers in the absorbent layer 200 are all short fibers with minimal impact on extensibility, it is necessary to limit the fiber length within the absorbent units 220. This allows for controllable production costs while maximizing the extensibility of the absorbent layer 200.
[0055] Optionally, the liquid aspiration unit 220 is set to 2mm to 30mm along its planar direction.
[0056] Specifically, taking the rhomboid liquid-absorbing unit 220 in the above embodiment as an example, the main distribution direction of the fibers in the liquid-absorbing layer 200 is the X direction in Figure 1. The maximum length of the fibers extending along the internal fiber extension direction of each liquid-absorbing unit 220, which is also the length of the transverse diagonal of the rhombus, is the maximum length of the differentially stretchable fibers in the liquid-absorbing unit 220. Therefore, the length of the fibers extending along the internal fiber extension direction of the liquid-absorbing unit 220 is set to 2mm to 30mm, that is, the maximum length of the differentially stretchable fibers in the liquid-absorbing unit 220 is set to 2mm to 30mm, thereby ensuring that the liquid-absorbing layer 200 has good stretchability while controlling production costs.
[0057] In the above embodiments, the factors affecting the extensibility of the absorbent layer 200 are not only the fiber length in the absorbent layer 200, but also the entanglement between fibers, which limits the extensibility in the fiber width direction. Optionally, the width of the absorbent unit 220 along its planar direction is set to 2mm to 30mm.
[0058] Specifically, taking the absorbent layer 200 with a rhomboid shape as an example in the above embodiment, the main fiber direction in the absorbent layer 200 is the X direction in the figure. The width of the absorbent unit 220 along the direction perpendicular to the fiber extension, that is, the longitudinal distance of the rhombus, determines how many fibers are entangled with each other in the fiber width direction in each absorbent unit 220. Therefore, the width of the absorbent unit 220 along the direction perpendicular to the fiber extension is set to 2mm to 30mm, which limits the number of fibers entangled with each other in the fiber width direction in each absorbent unit 220, thereby ensuring the overall extensibility of the absorbent layer 200. In order to further improve the extensibility of the absorbent layer 200, a plurality of slits 221 are formed in the absorbent unit 220. The slits 221 penetrate the absorbent layer 200 along the stacking direction, and the extension direction of the slits 221 is set at an angle to the extension direction of the fibers.
[0059] Specifically, since the maximum length of the poorly stretchable fibers in the absorbent unit 220 determines the stretchability of the absorbent layer 200, to further improve the stretchability of the absorbent layer 200, it is necessary to further reduce the maximum length of the fibers in the absorbent unit 220. The slit 221 can be specifically set in the middle of each absorbent unit 220. By further cutting the absorbent unit 220 through the slit 221, the fibers in the absorbent unit 220 can be further cut. In this embodiment, the slit 221 is set perpendicular to the fiber extension direction. In other embodiments of this application, the extension direction of the slit 221 only needs to be set at an angle to the fiber extension direction to ensure that the slit 221 can effectively cut the fibers in the absorbent unit 220. Therefore, the dressing provided in this embodiment, by setting the slit 221 in the absorbent unit 220, further improves the stretchability of the absorbent layer 200, and thus further improves the stretchability of the dressing.
[0060] Optionally, as shown in Figure 3, the absorbent layer 200 is provided with a superabsorbent nonwoven fabric layer 201 and a spunlace nonwoven fabric layer 202, which are stacked one on top of the other.
[0061] Specifically, the absorbent layer 200 provided in this embodiment is mainly composed of two types of nonwoven fabrics: a superabsorbent nonwoven fabric layer 201 and a spunlace nonwoven fabric layer 202 stacked one on top of the other. The superabsorbent nonwoven fabric has good hydrophilicity and excellent water-locking effect, while the spunlace nonwoven fabric has good diffusion properties, which can evenly disperse the liquid entering this layer. Thus, the wound exudate entering the spunlace nonwoven fabric will be diffused into the spunlace nonwoven fabric along the planar direction, and then absorbed and locked in by the superabsorbent nonwoven fabric on the spunlace nonwoven fabric, thereby achieving the absorption of wound exudate. In this embodiment, the incision 210 runs through the superabsorbent nonwoven fabric layer 201 and the spunlace nonwoven fabric layer 202 from top to bottom, which means that the two nonwoven fabrics in the absorbent layer 200 are cut together, thereby ensuring that each absorbent unit 220 includes superabsorbent nonwoven fabric and spunlace nonwoven fabric stacked from top to bottom. Ensure the wound exudate absorption capacity of each suction unit 220.
[0062] Optionally, as shown in Figure 4, the dressing for improving elasticity also includes a protective layer 500, which is disposed at the bottom of the contact layer 300 and is bonded to the contact layer 300.
[0063] Specifically, the protective layer 500 is configured as a release film, which can be made of coated paper, PP material, PE material, or a mixture of PP and PE materials. The protective layer 500 is directly adhered to the bottom of the contact layer 300. During transportation, the contact layer 300 is protected to prevent contamination by external bacteria. When the dressing needs to be applied to human skin, simply peel off the protective layer 500 to allow the contact layer 300 to adhere to the skin.
[0064] As shown in Figure 5, in an optional embodiment, the dressing for improved elasticity still comprises a film layer 100, an absorbent layer 200, a contact layer 300, and a protective layer 500 stacked from top to bottom. The absorbent layer 200 still has fibers extending in any planar direction and is formed by several through-cuts 210, thereby creating several independent absorbent units 220. Each absorbent unit 220 also includes both superabsorbent nonwoven fabric and spunlace nonwoven fabric. The cuts 210 also penetrate from top to bottom through the superabsorbent nonwoven fabric and spunlace nonwoven fabric, ensuring that each absorbent unit 220 includes superabsorbent nonwoven fabric and spunlace nonwoven fabric stacked from top to bottom. Each absorbent unit 220 may also have slits 221 to further improve the elasticity of the dressing. The liquid absorption layer 200 in this embodiment also includes a frame 230, which is disposed around the edge of the liquid absorption layer 200, and the liquid absorption unit 220 is disposed within the frame 230.
[0065] Specifically, taking the rhomboid absorbent unit 220 in the above embodiment as an example, the fiber direction in the absorbent layer 200 is the X direction in Figure 2. In this embodiment, the cut 210 is only provided in the middle of the absorbent layer 200; no cuts 210 are provided at the four edges of the rectangular absorbent layer 200. Thus, four end-to-end border strips 230 are formed around the absorbent layer 200, thus creating a border 230. Whenever the body part to which the dressing is applied moves, and the dressing is stretched, the film layer 100 and the contact layer are subjected to tension, which in turn stretches the absorbent layer 200. At this time, the uncut border 230 restricts the absorbent unit 220, preventing excessive displacement of the absorbent unit 220.
[0066] As shown in Figure 6, in an optional embodiment, the dressing for improved stretchability is still composed of a film layer 100, an absorbent layer 200, a contact layer, and a protective layer 500 stacked from top to bottom. The absorbent layer 200 still has fibers extending in any planar direction and is formed by several through-cuts 210, thereby creating several independent absorbent units 220. Each absorbent unit 220 also includes both superabsorbent nonwoven fabric and spunlace nonwoven fabric. The cuts 210 also penetrate from top to bottom through the superabsorbent nonwoven fabric and spunlace nonwoven fabric, ensuring that each absorbent unit 220 includes superabsorbent nonwoven fabric and spunlace nonwoven fabric stacked from top to bottom. Each absorbent unit 220 may also have slits 221 to further improve the stretchability of the dressing. Each absorbent unit 220 is also provided with a frame 230 to improve the tensile resilience of the absorbent layer 200. The arrangement of the cuts 210 in this embodiment is different. In other embodiments of this application, each absorbent unit 220 may also contain only one layer of superabsorbent nonwoven fabric.
[0067] Optionally, the liquid-absorbing layer 200 also includes connecting ribs, a plurality of connecting ribs being formed between the liquid-absorbing units 220 via cutouts 210, and the two ends of the connecting ribs being connected to the frame 230 respectively.
[0068] Specifically, taking the rhomboid absorbent unit 220 as an example, the absorbent layer 200 provided in this embodiment has multiple different sets of cuts 210. Each set of cuts 210 contains several spaced-apart cuts 210 arranged along the same straight line direction. A portion of all sets of cuts 210 are arranged parallel in any direction, while another portion is arranged parallel in the opposite direction where they intersect. Two sets of cuts 210 are intersected to cut rhomboid absorbent units 220 in the absorbent layer 200, forming connecting ribs between the absorbent units 220. The two ends of the connecting ribs are connected to the frame 230. Whenever the body part to which the dressing is applied moves, and the dressing is stretched, the film layer 100 and the contact layer are subjected to tension, which in turn stretches the absorbent layer 200. At this time, the connecting ribs also stretch, restricting the absorbent units 220 located between the connecting ribs and preventing excessive displacement of the absorbent units 220. In other embodiments of this application, such as those where the absorbent unit 220 is circular, the cuts 210 can be circular and arranged in a matrix on the absorbent layer 200, thereby cutting the absorbent unit 220 into a circle and forming connecting ribs between the absorbent units 220. Thus, the dressing with improved elasticity provided in this embodiment, by providing connecting ribs between the absorbent units 220, restricts the absorbent units 220 located between the connecting ribs, preventing excessive displacement of the absorbent units 220 and providing some assistance to the rebound of the dressing.
[0069] Optionally, the fibers of the absorbent layer 200 all extend in the same direction, and the extension direction of the connecting ribs is set at an angle to the extension direction of the fibers.
[0070] Specifically, taking the absorbent layer 200 with a rhomboid shape as an example, the fibers of the absorbent layer 200 all extend along the X direction in Figure 2, and the cut 210 is set at a 45° angle to the fiber extension direction. This avoids the situation where the extension direction of the connecting rib is the same as the fiber extension direction, which would result in the retention of long, uncut, poorly extensible fibers within the connecting rib, affecting the extensibility of the absorbent layer 200, and thus ensuring the extensibility of the entire dressing.
[0071] Optionally, the maximum length of the connecting rib 240 along the fiber extension direction is set to 1 mm to 30 mm.
[0072] Specifically, the width of the connecting ribs is set to 1mm to 30mm, which limits the maximum fiber length in the connecting ribs and ensures the extensibility of the liquid-absorbing layer 200.
[0073] In an optional embodiment, the improved stretch dressing still comprises a film layer 100, an absorbent layer 200, a contact layer, and a protective layer 500 stacked from top to bottom. The absorbent layer 200 still has fibers extending in any planar direction and is formed by several through-cuts 210, thereby creating several independent absorbent units 220. Each absorbent unit 220 also includes both superabsorbent nonwoven fabric and spunlace nonwoven fabric. The cuts 210 also penetrate the superabsorbent nonwoven fabric and spunlace nonwoven fabric from top to bottom, ensuring that each absorbent unit 220 includes superabsorbent nonwoven fabric and spunlace nonwoven fabric stacked from top to bottom. Each absorbent unit 220 may also have slits 221 to further improve the stretch of the dressing. Each absorbent unit 220 is also provided with a frame 230, and connecting ribs are provided between the absorbent units 220 to prevent excessive displacement of the absorbent units 220. As shown in Figure 7, the dressing provided in this embodiment for improving extensibility also includes a foam layer 400. The foam layer 400 is disposed between the absorbent layer 200 and the contact layer. Several cuts 210 penetrate the foam layer 400 so that the foam layer 400 forms several independent foam units 410, and the foam units 410 can be separated from each other.
[0074] Specifically, the foam layer 400 is made of polyurethane foam material, which effectively improves the absorbency of the dressing. For ease of production, the foam layer 400 is stacked and assembled with the absorbent layer 200 before cutting, thus ensuring the cutting effect of the absorbent layer 200. Similar to the above embodiment, the cut 210 includes two sets of intersecting straight cuts 210, each set of straight cuts 210 including multiple parallel straight cuts 210, thereby cutting the entire foam layer 400 into multiple rhomboid foam units 410. In other embodiments of this application, the foam units 410 can also be set into other shapes according to the actual production process and usage requirements. For example, square foam units 410 can be cut on the foam layer 400 by two sets of intersecting straight cuts 210 with equal spacing. Alternatively, the foam layer 400 can be cut into hexagonal foam units 410 by forming a planar honeycomb-like cut 210 with hexagonal cuts 210. Alternatively, multiple circular or triangular foam units 410 can be cut into the foam layer 400 through circular or triangular incisions 210. The dressing provided in this embodiment improves wound exudate absorption by using the foam layer 400 and the absorbent layer 200 together to form a core layer. Simultaneously, the foam layer 400, along with the absorbent layer 200, is also cut into independent units by the incisions 210. These foam units 410 and absorbent units 220 are stacked together to form the core layer unit, ensuring good elasticity of the dressing.
[0075] This application also provides a dressing preparation process for manufacturing the above-mentioned dressing with improved elasticity, comprising the following steps:
[0076] Step 1: Stack and combine the superabsorbent nonwoven fabric layer 201 and the spunlace nonwoven fabric layer 202 to form the liquid-absorbing layer 200.
[0077] Step 2: Place the liquid absorption layer 200 on the cutting platform and transport it to the cutting roller group. The cutter on the cutting roller group cuts the object to be cut, forming several independent and separable liquid absorption units 220 in the liquid absorption layer 200.
[0078] Step 4: Laminate the film layer 100, absorbent layer 200, contact layer 300 and protective layer 500 together to form a multi-layer dressing material;
[0079] Step 5: Cut and package the formed multi-layer dressing material to form a dressing product with improved extensibility.
[0080] Specifically, in preparing the aforementioned dressing with improved elasticity, the superabsorbent nonwoven fabric and spunlace nonwoven fabric are first separated from the raw material rollers and stacked together to form a complete absorbent layer 200. Then, the complete absorbent layer 200 is conveyed to a cutting platform. A cutter is arranged on the cutting roller assembly, capable of cutting through the absorbent layer 200 to form slits 210 and independent absorbent units 220. After cutting, the cut absorbent layer 200 is conveyed to the contact layer and release layer, and a film layer 100 is covered on the absorbent layer 200 before being conveyed to a molding machine for lamination. Finally, the molded multilayer dressing raw materials are cut and packaged to form the improved elasticity dressing product.
[0081] In an optional embodiment, the dressing also includes a foam layer 400.
[0082] The dressing preparation process provided in this embodiment involves mixing and stirring the foam stock solution before cutting the absorbent layer 200, coating and foaming to form a foam layer 400. The foam layer 400, absorbent layer 200, and contact layer are then stacked and assembled, and fed together into a cutting platform for cutting. Subsequently, the foam layer 400 and absorbent layer 200 are transported to the cutting platform. A cutter on the cutting roller assembly cuts through the absorbent layer 200 and foam layer 400, forming a cut 210, cutting out absorbent units 220 and foam units 410. After cutting, the cut absorbent layer 200 and foam layer 400 are transported to the contact layer and release layer, and a film layer 100 is covered on the absorbent layer 200 before being transported to a molding machine for lamination. Finally, the molded multi-layer dressing material is cut and packaged to form a dressing product with improved extensibility.
[0083] In addition to the technical aspects of the above embodiments, this application presents a comparative test of dressings with those in the prior art. The test method involves stretching the dressing to a fixed deformation position and recording the force required to stretch the dressing to the corresponding deformation position using a tensile tester. The extensibility of the dressing is determined by the magnitude of the corresponding tensile force. The following is a comparative data table of the extensibility-enhancing dressing in this application embodiment and conventional dressings in the art.
[0084] Table 1. Data from Tensile Tests of Dressings
[0085] Among them, dressing number 1 corresponds to a wound dressing composed of a film layer 100, an absorbent layer 200, a foam layer 400, a contact layer, and a protective layer 500 stacked from top to bottom. Dressing number 2 corresponds to a wound dressing composed of a film layer 100, a foam layer 400, a contact layer, and a protective layer 500 stacked from top to bottom. Dressing number 3 corresponds to the elasticity-enhancing dressing shown in Figure 6 of this application. Dressing number 4 corresponds to the elasticity-enhancing dressing shown in Figures 1 and 2 of this application. The three sets of tensile data in the table are tensile data obtained by stretching the dressing in the longitudinal, transverse, and diagonal directions. The data in the table above shows that by setting a through cut 210 in the absorbent layer 200, the absorbent layer 200 can be cut into independent absorbent units 220. This can effectively reduce the force required to stretch the dressing to the corresponding deformation position, release the extensibility of the film layer 100 connected to the absorbent layer 200 and the contact layer itself, improve the extensibility of the dressing, ensure good fit of the dressing to the human body when covering flexible parts such as elbows and knees, and improve the comfort of the dressing.
[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A dressing for improving elasticity, comprising a thin film layer (100), an absorbent layer (200), and a contact layer (300) stacked from top to bottom, characterized in that, The absorbent layer (200) has fibers that extend along any planar direction; Several incisions (210) are formed in the elasticity-enhancing dressing. The cut (210) penetrates the absorbent layer (200) along the stacking direction, so that the absorbent layer (200) forms a plurality of independent absorbent units (220). The liquid suction units (220) are separable from each other.
2. The dressing for improving elasticity according to claim 1, characterized in that, The maximum length of the liquid aspiration unit (220) along its planar direction is set to 2mm to 30mm.
3. The dressing for improving elasticity according to claim 2, characterized in that, The maximum width of the liquid aspiration unit (220) along its planar direction is set to 2mm to 30mm.
4. The dressing for improving elasticity according to claim 3, characterized in that, The liquid absorption layer (200) further includes a frame (230) which surrounds the edge of the liquid absorption layer (200), and a plurality of liquid absorption units (220) are disposed within the frame (230).
5. The dressing for improving elasticity according to claim 4, characterized in that, The liquid-absorbing layer (200) further includes a connecting rib (240), which is formed between the liquid-absorbing units (220) via the cut (210), and the two ends of the connecting rib (240) are respectively connected to the frame (230).
6. The dressing for improving elasticity according to claim 5, characterized in that, The fibers of the absorbent layer (200) all extend in the same direction, and the extension direction of the connecting rib (240) is set at an angle to the extension direction of the fibers.
7. The dressing for improving elasticity according to claim 6, characterized in that, The maximum length of the connecting rib (240) along the extension direction of the fiber is set to 1mm to 30mm.
8. The dressing for improving elasticity according to any one of claims 1 to 7, characterized in that, The liquid absorption unit (220) has a plurality of slits (221) formed therein, and the slits (221) penetrate the liquid absorption layer (200) along the stacking direction. The extension direction of the cut (221) is set at an angle to the extension direction of the fiber.
9. The dressing for improving elasticity according to claim 8, characterized in that, The absorbent layer (200) comprises a superabsorbent nonwoven fabric layer (201) and a spunlace nonwoven fabric layer (202), which are stacked one on top of the other.
10. The dressing for improving elasticity according to claim 8, characterized in that, The planar shape of the liquid absorption unit (220) can be circular, square, rhomboid, triangular or hexagonal.
11. The dressing for improving elasticity according to claim 8, characterized in that, The dressing that enhances elasticity also includes a foam layer (400). The foam layer (400) is disposed between the liquid-absorbing layer (200) and the contact layer (300). A plurality of the cuts (210) penetrate the foam layer (400) along the stacking direction so that the foam layer (400) forms a plurality of independent foam units (410), which can be separated from each other.
12. The dressing for improving elasticity according to claim 8, characterized in that, The dressing that enhances elasticity also includes a protective layer (500). The protective layer (500) is disposed at the bottom of the contact layer (300), and the protective layer (500) is bonded to the contact layer (300).
13. A dressing preparation process, configured to manufacture a dressing with improved extensibility as described in any one of claims 1-12, characterized in that, Includes the following steps: Step 1: Stack the superabsorbent nonwoven fabric layer (201) and the spunlace nonwoven fabric layer (202) to form the liquid-absorbing layer (200); Step 2: Place the liquid absorption layer (200) on the cutting platform and transport it to the cutting roller group. The cutter on the cutting roller group cuts the object to be cut, forming several independent and separable liquid absorption units (220) in the liquid absorption layer (200). Step 3: Laminate the film layer (100), the cut absorbent layer (200), the contact layer (300), and the protective layer (500) together to form a multilayer dressing material; Step 4: Cut and package the formed multi-layer dressing material to form a dressing product with improved extensibility.
14. The dressing preparation process according to claim 13, characterized in that, In step two, the liquid-absorbing layer (200) and the foam layer (400) are bonded together in the body to be cut.