Silica gel type non-woven fabric patch
By designing a silicone gel-type nonwoven fabric dressing, which combines a perforated PE film layer and a silicone gel layer, the shortcomings of traditional nonwoven fabric dressings in terms of adhesion and liquid absorption are solved, achieving good adhesion and wound healing effects even in wet environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ISO MEDICAL PRODS
- Filing Date
- 2025-01-08
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional non-woven fabric dressings are insufficient in terms of adhesion and liquid absorption, making them prone to falling off or causing skin damage when removed. Furthermore, their adhesion decreases in a wet environment, affecting wound healing.
The dressing uses a silicone gel-type nonwoven fabric, which includes a perforated PE film layer, an adhesive fiber layer, and a polyester fiber layer as the core layer, combined with a silicone gel layer as the skin-friendly layer. It uses a silicone gel coated substrate and a polyurethane hot melt adhesive layer to ensure good adhesion and breathability.
It achieves good adhesion in wet environments, prevents dressing from falling off, reduces skin damage, improves liquid absorption and retention, and promotes wound healing.
Smart Images
Figure CN224126168U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical dressing technology, specifically relating to a silicone gel-type nonwoven fabric dressing. Background Technology
[0002] In the current field of medical dressings, traditional non-woven fabric dressings often use acrylic pressure-sensitive adhesive as the main adhesive. The dressing core layer is often in direct contact with the wound surface containing exudate, while the adhesive on the non-woven fabric outside the core is often in contact with intact skin. However, the skin around the wound is often fragile due to the healing process, resulting in low surface tension. When the adhesive strength of the non-woven surface is weak, it cannot hold the dressing in place for a long time and is prone to falling off. When the adhesive strength of the non-woven surface is strong, the acrylic pressure-sensitive adhesive can easily cause mechanical damage to the fragile skin when removed after prolonged contact with intact skin, potentially leading to injury and the formation of new wounds.
[0003] Traditional adhesive nonwoven dressings mostly use acrylic pressure-sensitive adhesives. While these adhesives have strong adhesion and good bonding, patients often experience significant pain when removing them, causing even intact skin underneath to be pulled and resulting in mechanical damage to the epidermis. Furthermore, these adhesives turn white and harden when wet, and when sweat seeps from the surrounding skin, the adhesive strength of the acrylic-based pressure-sensitive adhesive decreases sharply, causing the dressing to fall off and making it impossible to reapply. This necessitates frequent dressing changes, increasing wound healing time and cost.
[0004] Traditional nonwoven dressings often use a single polymer fiber, such as viscose or polyester, as the core. While these fibers can quickly absorb exudate, their ability to retain fluid is poor. When there is a large amount of exudate, backflow can easily occur under pressure, leading to wound infection. Therefore, it is of great significance to provide a novel silicone gel-based nonwoven dressing that can overcome these problems. Utility Model Content
[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a silicone gel-type nonwoven dressing. It can quickly absorb small amounts of exudate while effectively locking it in. Furthermore, the adhesive in contact with the skin is made of silicone gel, ensuring good initial tack and holding power. It can be repeatedly applied, is skin-friendly and gentle, and allows for dressing changes without adhesion, allergies, or skin damage.
[0006] To achieve the objective of this utility model, the following technical solution is adopted:
[0007] In a first aspect, this utility model provides a silicone gel-type nonwoven fabric dressing, the dressing comprising a release film layer 2.1, a core layer 2.2, a silicone gel layer 2.3, a PU treatment agent layer 2.4, a silicone gel coating substrate layer 2.5, an adhesive layer 2.6, and a backing layer 2.7 stacked sequentially.
[0008] The core layer 2.2 includes a PE film layer and a fiber layer stacked sequentially; the PE film and the fiber layer are bonded together by heating; the fiber layer includes a viscose fiber layer and a polyester fiber layer bonded together by a needle punching process; the PE film layer is provided with perforations; the pore diameter of the pores on the PE film layer is 0.5-1mm, and the spacing between each pore is 0.5-2mm;
[0009] The PE film layer is in contact with the release film layer 2.1; the fiber layer is bonded to the silicone gel layer 2.3.
[0010] When using the aforementioned novel silicone gel nonwoven dressing, the part in contact with the wound is the core layer. The core layer is composed of perforated PE material, viscose fiber, and polyester fiber. Exudate is transferred through the perforated PE layer to the viscose and polyester fiber layers. The viscose fiber effectively absorbs and transfers wound exudate, while the polyester fiber effectively locks in the exudate to prevent backflow. The combination of these three materials efficiently controls wound exudate and prevents infection from contact between the cotton fibers in the core layer and the wound. The part in contact with intact skin is the silicone gel layer. The silicone gel material effectively reduces mechanical damage to both damaged and intact skin and maintains good adhesion even during sweating. It can be repeatedly applied and removed without falling off.
[0011] The pores on the PE film layer have a diameter of 0.5-1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, and the spacing between each pore is 0.5-2mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm or 1.9mm.
[0012] In this invention, the spacing between each hole refers to the distance from one edge of a hole to the edge of another hole. The perforations in the PE film layer facilitate the absorption of wound exudate. The aforementioned pore size range is more suitable for the absorption of wound exudate by the polyester fiber layer through the small pores, without leaving any cotton fibers on the wound.
[0013] Preferably, the basis weight of the PE film layer is 10-30 g / m³. 2 For example, it could be 10g / m 2 15g / m 2 20g / m2 25g / m 2 Or 30g / m 2 wait.
[0014] Preferably, the basis weight of the viscose fiber layer is 70-180 g / m². 2 For example, it could be 70g / m 2 90g / m 2 100g / m 2 120g / m 2 140g / m 2 160g / m 2 Or 180g / m 2 wait.
[0015] Preferably, the basis weight of the polyester fiber layer is 30-80 g / m². 2 For example, it could be 30g / m 2 40g / m 2 50g / m 2 60g / m 2 70g / m 2 Or 80g / m 2 wait.
[0016] In this invention, the combination of the PE film layer, viscose fiber layer, and polyester fiber layer provides excellent liquid conduction, absorption, and retention functions. When viscose fiber and polyester fiber are compounded in a specific weight ratio, the resulting core layer exhibits even better performance, with the two materials synergistically enhancing each other's superior liquid absorption and retention capabilities.
[0017] Preferably, the area of the core layer 2.2 is smaller than that of the release film layer 2.1 and the silicone gel layer 2.3, and the release film layer 2.1 is used to cover and protect the core layer.
[0018] Preferably, the silicone gel layer 2.3 has perforations, the area of which accounts for 5-30% of the total area of the silicone gel layer, for example, 5%, 10%, 15%, 20%, 25%, or 30%; the basis weight of the silicone gel layer 2.3 is 80-300 g / m³. 2 For example, it could be 80g / m 2 100g / m 2 150g / m 2 200g / m 2 250g / m 2 Or 300g / m 2 wait.
[0019] In this invention, the design of the silicone gel layer has greater advantages compared with conventional silicone gel layers. The perforated design helps improve the breathability of the product while ensuring the adhesion of the entire dressing.
[0020] In this invention, the material of the silicone gel coating layer is silicone gel. The silicone gel is applied to the silicone gel coating substrate layer. The silicone gel has good initial tack and holding power, is skin-friendly and soft, non-allergenic, and can be repeatedly applied.
[0021] In this invention, the basis weight of the silicone gel coating is 80-300 g / m³. 2 Within this range, the content can guarantee sufficient stickiness.
[0022] Preferably, the release film layer 2.1 is a release PE film layer, and the basis weight of the release film layer 2.1 is 40-100 g / m³. 2 For example, it could be 40g / m 2 45g / m 2 50g / m 2 55g / m 2 60g / m 2 65g / m 2 70g / m 2 75g / m 2 80g / m 2 85g / m 2 90g / m 2 95g / m 2 Or 100g / m 2 wait.
[0023] In this invention, the release PE film layer forms a folded, easily removable structure to protect the silicone gel layer and the core layer.
[0024] Preferably, the silicone gel coating substrate layer 2.5 is a silicone gel coating substrate, and the silicone gel coating substrate layer 2.5 is a thermoplastic TPU film layer; the thickness of the silicone gel coating substrate layer 2.5 is 10-35μm, for example, it can be 10μm, 15μm, 20μm, 25μm, 30μm or 35μm, etc.
[0025] In this invention, a thermoplastic TPU film layer is used as the substrate. The substrate is thin, breathable, and transparent, and also has antibacterial function.
[0026] Preferably, the PU treatment layer 2.4 is used to reduce the surface tension of the silicone gel coating substrate layer 2.5, so that the silicone gel layer 2.3 is tightly bonded to the substrate; the thickness of the PU treatment layer 2.4 is 0.01-10μm, for example, it can be 0.01μm, 1μm, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm or 10μm, etc.
[0027] In this invention, the PU treatment layer effectively reduces the surface tension of the TPU film, thereby improving the adhesion of the film surface and enabling it to bond tightly with the silicone gel. The thickness of the PU treatment layer 2.4 is 0.01-10μm. If the treatment layer is too thin, the PU film surface treatment effect will be poor, and the silicone gel layer and PU film layer will easily separate; if the PU treatment layer is too thick, it will excessively damage the surface of the PU film, resulting in a decrease in the elasticity of the PU film, which is not conducive to subsequent pore drilling.
[0028] Preferably, the adhesive layer 2.6 is used to bond the silicone gel coating substrate layer 2.5 and the backing layer 2.7 together.
[0029] Preferably, the adhesive layer 2.6 is a polyurethane hot melt adhesive layer formed by spraying polyurethane hot melt adhesive onto one side of the backing layer 2.7, and the basis weight of the polyurethane hot melt adhesive layer is 3-10 g / m³. 2 For example, it could be 3g / m 2 4g / m 2 5g / m 2 6g / m 2 7g / m 2 8g / m 2 9g / m 2 or 10g / m 2 wait.
[0030] Preferably, the polyurethane hot melt adhesive on the adhesive layer 2.6 is distributed in a dotted pattern; the area of the polyurethane hot melt adhesive dots accounts for 50-75% of the total area of the adhesive layer 2.6, for example, it can be 50%, 55%, 60%, 65%, 70% or 75%, etc.
[0031] In this invention, the adhesive layer is made of polyurethane hot melt adhesive, which has good adhesion and can effectively bond the non-woven fabric and the TPU film layer. The dotted bonding method of the TPU film and the non-woven fabric layer also improves the breathability of the entire dressing.
[0032] Preferably, the backing layer 2.7 is a spunlace nonwoven fabric layer, and the basis weight of the backing layer 2.7 is 30-60 g / m². 2 For example, it could be 30g / m 2 35g / m 2 40g / m 2 45g / m 2 50g / m 2 55g / m 2 Or 60g / m 2 wait.
[0033] In this invention, the backing layer is made of spunlace nonwoven fabric, which has good water repellency and breathability. The cross-laid mesh method greatly improves the breathability of the product.
[0034] The numerical range described in this utility model includes not only the point values listed above, but also any point values within the numerical range that are not listed. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list all the specific point values included in the range.
[0035] Compared with the prior art, the present invention has the following beneficial effects:
[0036] (1) The novel silicone gel nonwoven dressing of this utility model uses a core layer comprising a perforated PE film layer, a viscose fiber layer, and a polyester fiber layer. The perforated PE film layer can effectively guide exudate and isolate the wound surface, preventing the lint of the core layer from contacting the wound surface and causing wound contamination. The viscose fiber can effectively absorb and conduct wound exudate, and the polyester fiber can effectively lock in the liquid, preventing leakage of the core layer. At the same time, it provides a moist healing environment for the wound surface, ensuring that the wound surface is not soaked and effectively promoting wound healing.
[0037] (2) The novel silicone gel nonwoven dressing is designed with a silicone gel coating as the skin-friendly layer. The silicone gel material can effectively reduce mechanical damage to damaged and intact skin, and can maintain good adhesion even when sweating. It can be repeatedly applied without causing the dressing to fall off.
[0038] (3) The nonwoven substrate and TPU film substrate of the novel silicone gel nonwoven dressing are bonded by PUR dot bonding, which greatly improves the breathability of the dressing. Attached Figure Description
[0039] Figure 1 This is a schematic diagram of a silicone gel-type nonwoven fabric dressing product, including: 2.1 release film layer, 2.2 core layer, 2.3 silicone gel layer, 2.4 PU treatment agent layer, 2.5 silicone gel coating substrate layer, 2.6 adhesive layer, and 2.7 backing layer.
[0040] Figure 2 This is a cross-sectional view of a silicone gel-type nonwoven fabric dressing product, including: 2.1 release film layer, 2.2 core layer, 2.3 silicone gel layer, 2.4 PU treatment agent layer, 2.5 silicone gel coating substrate layer, 2.6 adhesive layer, and 2.7 backing layer.
[0041] Figure 3 This is a schematic diagram of the release film layer, core layer, silicone gel layer, PU treatment agent layer, silicone gel coating substrate layer, adhesive layer, and backing layer. Detailed Implementation
[0042] The technical solution of this utility model will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.
[0043] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.
[0044] Example 1
[0045] This embodiment provides a silicone gel-type nonwoven fabric dressing, which comprises, from top to bottom, a release film layer 2.1, a core layer 2.2, a silicone gel layer 2.3, a PU treatment agent layer 2.4, a silicone gel coated substrate layer 2.5, an adhesive layer 2.6, and a backing layer 2.7, stacked sequentially. A schematic diagram of the dressing and its components is shown below. Figure 1-3 As shown.
[0046] The release film layer 2.1 is a release PE film layer, and the basis weight of the release film layer 2.1 is 60 g / m³. 2 .
[0047] The core layer 2.2 includes a PE film layer and a fiber layer stacked sequentially; the PE film and the fiber layer are bonded together by heating; the fiber layer includes a viscose fiber layer and a polyester fiber layer bonded together by a needle punching process; the PE film layer has perforations.
[0048] The PE film layer is in contact with the release film layer 2.1; the polyester fiber layer in the fiber layer is bonded to the silicone gel layer 2.3.
[0049] The pores on the PE film have a diameter of 0.5 mm and a spacing of 1 mm between each pore.
[0050] The basis weight of the PE film is 20 g / m³. 2 .
[0051] The basis weight of the viscose fiber layer is 120 g / m². 2 .
[0052] The basis weight of the polyester fiber layer is 60 g / m². 2 .
[0053] The silicone gel layer 2.3 has perforations, the area of which accounts for 15% of the total area of the silicone gel layer. The basis weight of the silicone gel layer 2.3 is 200 g / m³. 2 .
[0054] The silicone gel coating substrate layer 2.5 is a thermoplastic TPU film layer, and the thickness of the silicone gel coating substrate layer 2.5 is 20μm.
[0055] The PU treatment layer 2.4 is a PU treatment layer formed by coating a PU treatment agent on one side of the silicone gel coating substrate layer 2.5, and the thickness of the PU treatment layer is 5μm.
[0056] The adhesive layer 2.6 is a polyurethane hot melt adhesive layer formed by spraying polyurethane hot melt adhesive onto one side of the backing layer 2.7, and the basis weight of the polyurethane hot melt adhesive layer is 7 g / m³. 2 The polyurethane hot melt adhesive on the adhesive layer 2.6 is distributed in a dotted pattern; the area of the polyurethane hot melt adhesive dots accounts for 70% of the total area of the adhesive layer 2.6.
[0057] The backing layer 2.7 is a spunlace nonwoven fabric layer with a basis weight of 50 g / m². 2 .
[0058] Preparation method of silicone gel-based nonwoven fabric dressing:
[0059] (1) Apply polyurethane hot melt adhesive by dot spraying, ensuring uniform adhesive amount, and tightly bond non-woven fabric and thermoplastic TPU film layer. Dot bonding method can improve air permeability and effectively ensure the adhesion between the two materials.
[0060] (2) Apply the PU treatment agent to the thermoplastic TPU film surface of the nonwoven fabric that has been laminated in step (1). Through chemical reaction, the tension of the thermoplastic TPU film surface is effectively reduced and the adhesion of the film surface is improved.
[0061] (3) Apply silicone gel to the transparent PU film that has been coated with PU treatment agent to fully ensure the adhesion and firmness of the entire product. The silicone gel layer adheres tightly to the skin around the wound, which can effectively reduce mechanical damage to damaged and intact skin, and can maintain good adhesion even when sweating, and can be repeatedly applied.
[0062] (4) The core layer is applied online onto the silicone gel layer, and the core layer can effectively absorb wound exudate.
[0063] (5) The release film is a silicone-coated release film with the peeling side facing the dressing. The pre-folded design can better conform to the entire dressing change process.
[0064] Example 2
[0065] This embodiment provides a silicone gel-type nonwoven fabric dressing, which consists of, from top to bottom, a release film layer 2.1, a core layer 2.2, a silicone gel layer 2.3, a PU treatment agent layer 2.4, a silicone gel coating substrate layer 2.5, an adhesive layer 2.6, and a backing layer 2.7.
[0066] The release film layer is a release PE film layer, and the basis weight of the release film layer is 40 g / m³. 2 .
[0067] The core layer 2.2 comprises a PE film layer and a fiber layer stacked sequentially; the PE film and the fiber layer are bonded together by heating; the fiber layer comprises a viscose fiber layer and a polyester fiber layer bonded together by a needle punching process; the PE film layer has perforations. The PE film layer is in contact with the release film layer 2.1; the fiber layer is bonded to the silicone gel layer 2.3.
[0068] The pores on the PE film have a diameter of 1 mm and a spacing of 0.5 mm between each pore.
[0069] The basis weight of the PE film is 10 g / m³. 2 .
[0070] The basis weight of the viscose fiber layer is 70 g / m². 2 .
[0071] The basis weight of the polyester fiber layer is 30 g / m². 2 .
[0072] The silicone gel layer 2.3 has perforations, the area of which accounts for 5% of the total area of the silicone gel layer. The basis weight of the silicone gel layer 2.3 is 150 g / m³. 2 .
[0073] The silicone gel coating substrate layer 2.5 is a thermoplastic TPU film layer, and the thickness of the silicone gel coating substrate layer 2.5 is 10μm.
[0074] The PU treatment layer 2.4 is a PU treatment layer formed by coating a PU treatment agent on one side of the silicone gel coating substrate layer 2.5, and the thickness of the PU treatment layer is 1μm.
[0075] The adhesive layer 2.6 is a polyurethane hot melt adhesive layer formed by spraying polyurethane hot melt adhesive onto one side of the backing layer 2.7, and the basis weight of the polyurethane hot melt adhesive layer is 3 g / m³. 2 The polyurethane hot melt adhesive on the adhesive layer 2.6 is distributed in a dotted pattern; the area of the polyurethane hot melt adhesive dots accounts for 60% of the total area of the adhesive layer 2.6.
[0076] The backing layer 2.7 is a spunlace nonwoven fabric layer with a basis weight of 30 g / m². 2 .
[0077] Example 3
[0078] This embodiment provides a silicone gel-type nonwoven fabric dressing, which consists of, from top to bottom, a release film layer 2.1, a core layer 2.2, a silicone gel layer 2.3, a PU treatment agent layer 2.4, a silicone gel coating substrate layer 2.5, an adhesive layer 2.6, and a backing layer 2.7.
[0079] The release film layer is a release PE film layer, and the basis weight of the release film layer is 100 g / m³. 2 .
[0080] The core layer 2.2 comprises a PE film layer and a fiber layer stacked sequentially; the PE film and the fiber layer are bonded together by heating; the fiber layer comprises a viscose fiber layer and a polyester fiber layer bonded together by a needle punching process; the PE film layer has perforations. The PE film layer is in contact with the release film layer 2.1; the fiber layer is bonded to the silicone gel layer 2.3.
[0081] The pores on the PE film have a diameter of 0.8 mm and a spacing of 2 mm between each pore.
[0082] The basis weight of the perforated PE film layer is 30 g / m³. 2 .
[0083] The basis weight of the viscose fiber layer is 180 g / m². 2 .
[0084] The basis weight of the polyester fiber layer is 80 g / m². 2 .
[0085] The silicone gel layer 2.3 has perforations, the area of which accounts for 30% of the total area of the silicone gel layer. The basis weight of the silicone gel layer 2.3 is 300 g / m³. 2 .
[0086] The silicone gel coating substrate layer 2.5 is a thermoplastic TPU film layer, and the thickness of the silicone gel coating substrate layer 2.5 is 35μm.
[0087] The PU treatment layer 2.4 is a PU treatment layer formed by coating a PU treatment agent on one side of the silicone gel coating substrate layer 2.5, and the thickness of the PU treatment layer is 10 μm.
[0088] The adhesive layer 2.6 is a polyurethane hot melt adhesive layer formed by spraying polyurethane hot melt adhesive onto one side of the backing layer 2.7, and the basis weight of the polyurethane hot melt adhesive layer is 10 g / m³. 2 The polyurethane hot melt adhesive on the adhesive layer 2.6 is distributed in a dotted pattern; the area of the polyurethane hot melt adhesive dots accounts for 75% of the total area of the adhesive layer 2.6.
[0089] The backing layer 2.7 is a spunlace nonwoven fabric layer with a basis weight of 60 g / m². 2 .
[0090] Example 4
[0091] This embodiment provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Embodiment 1 is that the pores on the PE film layer have a diameter of 0.1 mm and a spacing of 0.1 mm.
[0092] Example 5
[0093] This embodiment provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Embodiment 1 is that the silicone gel layer 2.3 does not have any perforations.
[0094] Example 6
[0095] This embodiment provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and that of Embodiment 1 is that the basis weight of the silicone gel layer 2.3 is 60 g / m². 2 .
[0096] Example 7
[0097] This embodiment provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Embodiment 1 is that the basis weight of the silicone gel layer 2.3 is 400 g / m². 2 .
[0098] Example 8
[0099] This embodiment provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Embodiment 1 is that the polyurethane hot melt adhesive on the adhesive layer 2.6 is completely coated on the backing layer 2.7.
[0100] Comparative Example 1
[0101] This comparative example provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Example 1 is that the core layer 2.2 does not contain an adhesive fiber layer, but is replaced by an equal amount of polyester fiber layer.
[0102] Comparative Example 2
[0103] This comparative example provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Example 1 is that the core layer 2.2 does not contain a polyester fiber layer, but is replaced by the same amount of polyester fiber layer.
[0104] Comparative Example 3
[0105] This comparative example provides a silicone gel-type nonwoven fabric dressing. The only difference between this dressing and Example 1 is that the core layer 2.2 uses polypropylene fibers instead of polyester fibers.
[0106] The efficacy of the silicone gel-type nonwoven fabric dressings provided in Examples 1-8 and Comparative Examples 1-3 was tested.
[0107] Test 1: A comparative test was conducted on the water absorption and viscosity of the patented product and commercially available products. Three replicates were performed for each group. Test method: EN 13726-2. Test results are shown in Table 1. Viscosity test method: ASTM D903. Test results are shown in Table 1.
[0108] Table 1
[0109]
[0110]
[0111] Test 2: The patented product was compared with similar products on the market in a trial setting among 30 people, and scores were given for initial tack, adhesion, comfort, allergy rate, and removal feel.
[0112] (1) Initial viscosity evaluation score:
[0113] 0 = Good initial adhesion (no lifting edges after application to the skin, and a relatively firm fit);
[0114] 1 = Initial adhesion is average (slight edge lifting after being applied to the skin, and the adhesion is average when first applied);
[0115] 2 = Poor initial adhesion (severe edge lifting after application to the skin, weak adhesion when first applied).
[0116] (2) Adhesion evaluation
[0117] 0 = Over 90% of the skin adhesion area (the sample basically does not detach from the skin);
[0118] 1 = 75%-90% of the area adhered to the skin (with some edges detached from the skin);
[0119] 2 = 50%-75% of the product adheres to the skin (less than half of the product detaches from the skin);
[0120] 3 = Less than 50% of the product adheres to the skin but has not separated (more than half of the product has detached from the skin, but separation is not complete);
[0121] 4 = Sample detachment (sample completely detaches from skin).
[0122] (3) Comfort evaluation;
[0123] 0 = Good comfort (the sample is skin-friendly after application, with no obvious discomfort);
[0124] 1 = Comfort level is average (a slight discomfort was felt after the sample was applied);
[0125] 2 = Poor comfort (the sample feels uncomfortable after being applied).
[0126] (4) Evaluation of allergies
[0127] 0 = No obvious skin reaction;
[0128] 1 = Mild erythema covering most of the test site;
[0129] 2 = Moderate erythema, possibly with mild edema;
[0130] 3 = Severe erythema, which may include edema, blisters, bullae and / or ulcers.
[0131] (5) Remove sensory evaluation
[0132] 0 = No pain (the product is removed gently without pain);
[0133] 1 = Slight pain (slight pain when removing the product);
[0134] 2 = Severe pain (severe pain when removing the product).
[0135] The scoring statistics are shown in Table 2.
[0136] Table 2
[0137]
[0138]
[0139] A comparison between Example 4 and Example 1 shows that the smaller the pore size on the PE film layer, the less conducive it is to liquid absorption, thus affecting the comfort of the patch application. A comparison between Example 5 and Example 1 shows that without perforations on the silicone gel layer, the adhesion is stronger, but excessive removal will be painful, resulting in a poor user experience.
[0140] A comparison of Examples 6 and 7 with Example 1 shows that both excessive and insufficient amounts of silicone gel layer are detrimental to the application, leading to insufficient adhesion or reduced comfort. A comparison of Examples 8 and 1 shows that a dotted distribution of the polyurethane hot melt adhesive on the adhesive layer is more beneficial for breathability and comfort.
[0141] By comparing Comparative Examples 1-3 with Example 1, it can be seen that the core layer material in Example 1 can effectively lock in the liquid and prevent leakage of the core layer; the effect of Comparative Examples 1-3 is poor; the type of material of the core layer determines the liquid absorption capacity of the dressing, and the effect becomes worse after changing the material, which is not conducive to use.
[0142] The results show that the product of this utility model has good water absorption and comfort / adhesion, and is almost painless when peeled off, without causing mechanical damage to the skin.
[0143] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.
Claims
1. A silicone gel type nonwoven fabric patch characterized by, The dressing comprises a release film layer (2.1), a core layer (2.2), a silicone gel layer (2.3), a PU treatment agent layer (2.4), a silicone gel coating substrate layer (2.5), an adhesive layer (2.6), and a backing layer (2.7) stacked sequentially. The core layer (2.2) includes a PE film layer and a fiber layer stacked sequentially; the PE film and the fiber layer are bonded together by heating; the fiber layer includes a viscose fiber layer and a polyester fiber layer bonded together by a needle punching process; the PE film layer is provided with perforations; the diameter of the perforations on the PE film layer is 0.5-1mm, and the spacing between each perforation is 0.5-2mm; The PE film layer is in contact with the release film layer (2.1); the fiber layer is bonded to the silicone gel layer (2.3).
2. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The PE film layer has a grammage of 10-30 g / m 2 .
3. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The weight of the viscose fiber layer is 70-180 g / m 2 The weight of the polyester fiber layer is 30-80 g / m 2 .
4. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The area of the core layer (2.2) is smaller than that of the release film layer (2.1) and the silicone gel layer (2.3), and the release film layer (2.1) is used to cover and protect the core layer.
5. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The silicon gel layer (2.3) is provided with punching, and the area of the holes accounts for 5-30% of the total area of the silicon gel layer; the gram weight of the silicon gel layer (2.3) is 80-300 g / m 2 .
6. The silicone gel-type nonwoven fabric dressing according to claim 1, characterized in that, The release film layer (2.1) is a release PE film layer, the grammage of the release film layer (2.1) is 40-100 g / m 2 .
7. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The silicone gel coating substrate layer (2.5) is a silicone gel coating substrate, and the silicone gel coating substrate layer (2.5) is a thermoplastic TPU film layer; the thickness of the silicone gel coating substrate layer (2.5) is 10-35μm.
8. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The PU treatment agent layer (2.4) is used to reduce the surface tension of the silicone gel coating substrate layer (2.5) so that the silicone gel layer (2.3) is tightly bonded to the substrate; the thickness of the PU treatment agent layer 2.4 is 0.01-10μm.
9. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The adhesive layer (2.6) is used to bond the silicone gel coating substrate layer (2.5) and the backing layer (2.7) together; The adhesive layer (2.6) is a polyurethane hot melt adhesive layer formed by spraying polyurethane hot melt adhesive on one side of the backing layer (2.7), and the grammage of the polyurethane hot melt adhesive layer is 3-10 g / m 2 ; The polyurethane hot melt adhesive on the adhesive layer (2.6) is distributed in a dotted pattern; the area of the polyurethane hot melt adhesive dots accounts for 50-75% of the total area of the adhesive layer (2.6).
10. The silicone gel-type nonwoven fabric patch according to claim 1, characterized by The backing layer (2.7) is a spunlace nonwoven layer, the grammage of the backing layer (2.7) is 30-60 g / m 2 .