Dry dressing

Abstract

A dry dressing for adhering to human skin. The dry dressing includes a backing layer and a contact layer. The contact layer is disposed on the backing layer. The contact layer includes a hydrocolloid and a nutrient. The nutrient is mixed in the hydrocolloid. The hydrocolloid is formed dryly on the backing layer. The composition of the hydrocolloid includes polyvinyl alcohol and polyvinylpyrrolidone. The proportion of polyvinyl alcohol and polyvinylpyrrolidone in the composition of the hydrocolloid accounts for more than 96% of the weight of the hydrocolloid, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone in the composition of the hydrocolloid is 0.725 to 0.785.

Description

Technical Field

[0001] The present invention relates to a dressing, in particular to a dry dressing with a dry hydrophilic colloid. Background Art

[0002] Dressings for medical or cosmetic use are used to adhere to the skin to achieve the effect of treating or maintaining the skin. Since most of the nutrients contained in these dressings need to be carried by a liquid for the skin to absorb, these dressings are often soaked with essence and sealed in a package in a wet form for use.

[0003] However, in order to avoid the growth of bacteria in the essence of the wet dressing, the essence often contains preservatives, which are likely to cause allergic discomfort to specific constitution users when using the dressing. Moreover, the wet dressing also has a certain weight and is not easy to carry. In case of accidental extrusion during transportation causing the package to rupture, in addition to the need to clean the spilled essence separately, the wet dressing with a broken package is also difficult to use again, which is quite inconvenient. Summary of the Invention

[0004] The present invention aims to provide a dry dressing, which is convenient for carrying and storage, and is not likely to cause allergic discomfort to users.

[0005] The dry dressing disclosed in an embodiment of the present invention is used to adhere to the human skin. The dry dressing includes a substrate layer and a contact layer. The contact layer is disposed on the substrate layer. The contact layer includes a hydrophilic colloid and a nutrient. The nutrient is mixed in the hydrophilic colloid. The hydrophilic colloid is formed dry on the substrate layer. The composition of the hydrophilic colloid includes polyvinyl alcohol and polyvinylpyrrolidone, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone in the composition of the hydrophilic colloid is more than 96% of the weight of the hydrophilic colloid, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone in the composition of the hydrophilic colloid is from 0.725 to 0.785.

[0006] According to the dry dressing disclosed in the above embodiment, by forming the hydrophilic colloid mixed with the nutrient dry on the substrate layer, there is no need to worry about problems such as excessive weight or package rupture before wetting and using, which is beneficial for carrying and storage. In addition, the dry dry dressing is also beneficial for preservation and does not require additional addition of preservatives, thus there is no problem of easily causing allergic discomfort to users with specific skin types.

[0007] In addition, the hydrophilic colloid with a composition including polyvinyl alcohol and polyvinylpyrrolidone with a weight ratio of from 0.725 to 0.785 can absorb water and expand completely in 2 to 3 seconds, without excessive waiting for the water absorption time of the hydrophilic colloid, and the weight of the hydrophilic colloid is moderate after water absorption and is not easy to slide on the skin, which is suitable for users to apply to release nutrients.

[0008] The above description of the content of the present invention and the following description of the embodiments are used to demonstrate and explain the principles of the present invention, and to provide a further explanation of the claims of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. is a side view schematic diagram of a dry dressing according to an embodiment of the present invention.

[0010] Figures 2 to 3 is Figure 1 the manufacturing process of the dry dressing.

[0011] Figure 4 is Figure 1 the using process of the dry dressing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following will introduce an embodiment of the present invention. Please refer to Figure 1 , which is a side view schematic diagram of a dry dressing according to an embodiment of the present invention.

[0013] This embodiment provides a dry dressing 10, which includes a substrate layer 100 and a contact layer 200. The contact layer 200 is disposed on the substrate layer 100, and the contact layer 200 includes a hydrocolloid 210 and a nutrient 220 that are mixed with each other in the same layer.

[0014] Specifically, the nutrient 220 is mixed with the hydrocolloid 210 in a wet state so as to be fully distributed in the hydrocolloid 210, but the present invention is not limited thereto, and the nutrient may also be mixed with the hydrocolloid in a dry state. The contact layer 200 containing the hydrocolloid 210 and the nutrient 220 mixed with each other is printed on the substrate layer 100 by, for example, screen printing, coating, dispensing, inkjet printing, and impregnation, as shown in Figure 2 ; and by placing the substrate layer 100 and the contact layer 200 in a dry environment, the hydrocolloid 210 is formed dryly on the substrate layer 100, as shown in Figure 3 , and the moisture WW evaporates upward, where Figures 2 to 3 is Figure 1 the manufacturing process of the dry dressing.

[0015] The dry dressing 10 is, for example, used to be wetted and then attached to the human skin. Please also refer to Figure 4 , which is Figure 1 the using process of the dry dressing. As shown in Figure 4 , the user first adds moisture or essential oil WE to the dry dressing 10, and then, as shown in Figure 2As shown, the hydrocolloid 210 swells after absorbing water and forms a high osmotic pressure, causing the hydrogel cross-linked polymer inside the hydrocolloid 210 to generate a fluid pressure to transport the nutrient 220, and enabling the dried dressing 10 after absorbing water to adhere to the human skin to release the nutrient 220. Among them, taking the dried dressing containing about 4 to 5 grams (g) of hydrocolloid as an example, after adding 7.5, 15, and 22.5 grams of water respectively for 30 seconds, all the water is absorbed, about 3 to 4 grams of water remains, and about 6 to 7 grams of water remains respectively. Therefore, it can be known that each unit of hydrocolloid absorbs a fixed amount of water and does not absorb water excessively.

[0016] The composition of the hydrocolloid 210 includes polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP). PVA provides the strength of the hydrocolloid 210, and PVP provides the hydrophilicity of the hydrocolloid 210. Specifically, in the composition of the hydrocolloid 210, the weight ratio of PVA and PVP in the hydrocolloid 210 is more than 96%, and the weight ratio of PVA and PVP can be 0.725 to 0.785 to achieve a balance between formability and hydrophilicity, and can retain the nutrient 220 while maintaining a certain fluidity in the wet state.

[0017] The following table shows seven formulations of the dried dressing, where the hydrocolloid is about 5 grams in each, the weight ratio of PVA and PVP in the hydrocolloid is 96% in each, and the nutrients in these seven formulations all contain phycoerythrin that can reduce iodine solution. The purpose of using phycoerythrin is to test whether the dried dressing of these seven formulations is likely to release the nutrient with phycoerythrin after absorbing water. By soaking the dried dressing of these seven formulations in iodine solution after absorbing water and observing the transparency of the released phycoerythrin reducing the deep purple iodine solution, it is judged whether the nutrient is released completely. The higher the transparency, the easier it is to release the nutrient.

[0018]

[0019]

[0020] According to the comparison table of Formulas 1 to 7 above, it can be known that when the weight ratio of PVA to PVP is from 0.725 to 0.785, the swelling time of the hydrocolloid 210 after absorbing water can be within 2 to 3 seconds, which is suitable for users to add water or essential oil WE and use it without waiting too long for the water absorption time of the hydrocolloid 210. If the weight ratio of PVA to PVP is less than 0.725 (i.e., too much PVP), the mixture of PVA and PVP with this weight ratio needs to absorb a considerable amount of water to swell, and the mixture of PVA and PVP with this weight ratio will be too heavy after absorbing a considerable amount of water, causing discomfort to the user during application, and will also be overly liquid and difficult to fix on the substrate for application. If the weight ratio of PVA to PVP is more than 0.785 (i.e., too much PVA), the mixture of PVA and PVP with this weight ratio needs a considerable amount of time to absorb water and swell, and the mixture of PVA and PVP with this weight ratio will be overly solid after absorbing water and difficult to unfold for application, and even have a stuffy feeling; in addition, according to the experiment of the reduction effect of phycobilin on iodine solution, it can be known that when the weight ratio of PVA to PVP is more than 0.785, the nutrient containing phycobilin is not easily released to carry out the reduction (color change) reaction on the iodine solution.

[0021] The above-mentioned PVA and PVP constitute the basic components of the hydrocolloid 210. In addition, the components of the hydrocolloid 210 can also include other additives to achieve other good effects. Specifically, the components of the hydrocolloid 210 can also include sodium polyacrylate (PAA-Na). A little PAA-Na can increase the viscosity of the hydrocolloid 210 to improve the feel of the dry facial mask 10 after being wetted. Specifically, in the components of the hydrocolloid 210, the overall weight ratio of PAA-Na is 0.2% to 0.4%.

[0022] The components of the hydrocolloid 210 can also include xanthan gum and guar gum (Jaguar) to increase the strength of the hydrocolloid 210 after swelling, avoid the phenomenon of collapse of PVA and PVP in the basic components of the hydrocolloid 210 when encountering specific ions or components with too high or too low pH values, and further increase the swelling effect of the hydrocolloid 210 when absorbing water, and improve the smooth feel of the hydrocolloid 210 after swelling. Specifically, in the components of the hydrocolloid 210, the overall weight ratio of xanthan gum is 0.4% to 0.5%, and the overall weight ratio of guar gum is 0.05% to 0.2%.

[0023] The formulations of PAA-Na, xanthan gum and guar gum are shown in the following table, and the application feeling tests of six persons are attached. Among them, the touch is used as the priority evaluation order of satisfaction, followed by the smooth feeling and the swelling feeling. The satisfaction degrees from high to low are Additive Formula Y, Additive Formula X and Additive Formula Z in sequence, and the satisfaction degree of Additive Formula Z is too low and is judged as unqualified.

[0024]

[0025]

[0026] The composition of the hydrocolloid 210 may also include carboxymethyl cellulose (CMC). In the composition of the hydrocolloid 210, the overall weight ratio of CMC may be 0.3% or more. Thereby, during the process of drying the hydrocolloid 210, the effect of rapid drying within 6 minutes can be achieved under low-temperature conditions of 50°C or below, so as to avoid the deterioration of the nutrient 220 caused by drying conditions above 50°C. Among them, the overall weight ratio of CMC may also be 0.3% to 2.0%, so as to achieve a balance between maintaining the weight ratios of PVA and PVP and the drying time; and, when the overall weight ratio of CMC exceeds 2%, the reduction amplitude of the drying time is not significant, so further limiting the overall weight ratio of CMC to 0.3% to 2.0% can also save costs. The following is a relationship table between the overall weight ratio of CMC and the drying time of the hydrocolloid 210.

[0027]

[0028] The composition of the nutrient 220 may include, for example, pH-neutral components such as hyaluronic acid, fermented β-glucan, and proteoglycan extract, active ingredients such as proteins or amino acids (Active Ingredient), antioxidant reducing agents such as phycoerythrin, or metal ions such as calcium, magnesium, sodium, and potassium. Among them, it can be known from the following experimental description that phycoerythrin can protect the skin and eliminate free radicals: Soaking the dry dressing containing phycoerythrin in an iodine solution, the phycoerythrin is released into the iodine solution for reduction, making the brown iodine molecules become colorless iodide ions, and making the original colored iodine solution become transparent.

[0029] According to the dry dressing of the above embodiment, by dry-forming the hydrocolloid mixed with nutrients on the substrate layer, there is no need to worry about problems such as excessive weight or packaging rupture before wet use, which is beneficial for carrying and storage. In addition, the dry dry dressing is also beneficial for preservation and does not require additional preservatives, thus there is no problem of easily causing allergic discomfort to users with specific skin types.

[0030] In addition, the hydrocolloid with a weight ratio of PVA and PVP of 0.725 to 0.785 can absorb water and expand completely within 2 to 3 seconds, without excessive waiting for the water absorption time of the hydrocolloid, and the weight of the hydrocolloid is moderate after water absorption and is not easy to slide on the skin, which is suitable for users to apply to release nutrients.

[0031] According to the dry dressing of the present invention, the hydrophilic colloid containing PVA and PVP can expand by absorbing moisture or essential oils, and the components suitable for nutrients include neutral components such as hyaluronic acid, fermented β-glucan, and proteoglycan extract.

[0032] According to the dry dressing of the present invention, in addition to PVA and PVP, the hydrophilic colloid containing xanthan gum and guar gum can expand by absorbing moisture, and the components suitable for nutrients include metal ions such as calcium, magnesium, sodium, and potassium, or active components with poor alcohol compatibility such as proteins and amino acids.

[0033]

Symbol Explanation

[0034] 10: Dry dressing

[0035] 100: Substrate layer

[0036] 200: Contact layer

[0037] 210: Hydrophilic colloid

[0038] 220: Nutrient

[0039] WW: Moisture

[0040] WE: Essential oil.

Claims

1. A dry dressing for adhering to human skin, characterized in that, The dry dressing comprises: a backing layer; and a contact layer disposed on the backing layer, the contact layer comprising a hydrocolloid and a nutrient, the nutrient being mixed in the hydrocolloid, and the hydrocolloid being formed dry on the backing layer; wherein the composition of the hydrocolloid comprises polyvinyl alcohol and polyvinylpyrrolidone, the proportion of polyvinyl alcohol and polyvinylpyrrolidone in the composition of the hydrocolloid accounts for more than 96% of the weight of the hydrocolloid, and the weight ratio of polyvinyl alcohol to polyvinylpyrrolidone in the composition of the hydrocolloid is 0.725 to 0.

785.

2. The dry dressing according to claim 1, characterized in that, The contact layer is printed on the backing layer by screen printing, coating, dispensing, inkjet printing or impregnation.

3. The dry dressing according to claim 1, characterized in that, The composition of the hydrocolloid further comprises sodium polyacrylate.

4. The dry dressing according to claim 3, characterized in that, In the composition of the hydrocolloid, the weight proportion of sodium polyacrylate is 0.2% to 0.4%.

5. The dry dressing according to claim 1, characterized in that, The composition of the hydrocolloid further comprises xanthan gum and guar gum.

6. The dry dressing according to claim 5, characterized in that, In the composition of the hydrocolloid, the overall weight proportion of xanthan gum is 0.4% to 0.5%, and the overall weight proportion of guar gum is 0.05% to 0.2%.

7. The dry dressing according to claim 5, characterized in that, The composition of the nutrient comprises metal ions.

8. The dry dressing according to claim 1, characterized in that, The composition of the hydrocolloid further comprises carboxymethyl cellulose.

9. The dry dressing according to claim 8, characterized in that, In the composition of the hydrocolloid, the weight proportion of carboxymethyl cellulose is 0.3% or more.

10. The dry dressing according to claim 1, characterized in that, The composition of the nutrient comprises protein or amino acid.

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