Disclosure of Invention
The invention aims to provide a composite wound dressing and a preparation process thereof. The composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
The invention is realized by the following technical scheme:
the composite wound dressing comprises a release layer, a silica gel composite layer, an intermediate layer and a substrate layer, wherein a cavity is formed between the silica gel composite layer and the substrate layer, the intermediate layer is arranged in the cavity, a window is formed in the silica gel composite layer, and the size of the window is smaller than that of the intermediate layer;
the silica gel composite layer sequentially comprises silica gel, a polyurethane film and polyacrylate adhesive from top to bottom, the middle layer sequentially comprises a contact layer, a first bonding layer and a moisture absorption layer from top to bottom, and the base material layer sequentially comprises a second bonding layer and a waterproof breathable layer from top to bottom.
The invention aims to provide a composite wound dressing and a preparation process thereof. The composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
Preferably, the silica gel composite layer and the second bonding layer are both provided with through holes.
Preferably, the contact layer is a gel fiber non-woven fabric, the moisture absorption layer is polyurethane foam or polyvinyl alcohol foam, the waterproof breathable layer is a polyurethane film or polyurethane elastic non-woven fabric, the first bonding layer is a hot melt adhesive net film or a net point film, and the second bonding layer is a pressure-sensitive adhesive.
Preferably, the material of the gel fiber non-woven fabric is one or more of alginate fibers, modified cellulose fibers, modified chitosan fibers and polyvinyl alcohol fibers.
Preferably, the gram weight of the gel fiber non-woven fabric is 80-180 g/m 2 The thickness is 1.0-5.0 mm, and the gram weight of the first bonding layer is 8-50 g/m 2 The thickness of the moisture absorption layer is 2-5 mm.
Preferably, the thickness of the waterproof breathable layer is 10-150 mu m, and the gram weight of the pressure-sensitive adhesive is 10-40 g/m 2 。
Preferably, the thickness of the polyurethane film is 10-40 mu m, and the gram weight of the silica gel is 30-300 g/m 2 The gram weight of the polyacrylate adhesive is 10-40 g/m 2 。
Preferably, the shape of the through hole is a circle, a diamond or a polygon.
Preferably, the release layer comprises a first release film and a second release film, wherein a bending part is arranged at one end of the first release film close to the middle of the wound dressing, and the second release film is partially covered on the bending part of the first release film.
A process for preparing a composite wound dressing, comprising the steps of:
step S1: unreeling and flatly paving the contact layer, the first bonding layer and the moisture absorption layer, and putting the materials into a tentering and shaping oven for shaping, wherein the temperature of the oven is 90-200 ℃, the drying time is 10-600 s, and the material entering speed is 1-10 m/min;
step S2: rapidly pressing by two press rolls, cooling and shaping at room temperature, and preparing a composite coiled material;
step S3: respectively unreeling the substrate layer, the composite coiled material, the silica gel composite layer and the release layer in multi-station dressing equipment;
step S4: cutting the composite coiled material into slices through a first cutter after unreeling, and attaching the composite coiled material to the pressure-sensitive adhesive of the unreeled substrate layer;
step S5: unwinding the silicone gel composite layer, and attaching the edges of the silicone gel composite layer with one side of the polyacrylate adhesive facing the pressure-sensitive adhesive of the substrate layer;
step S6: the silica gel composite layer is provided with a window in the middle through a second cutter;
step S7: the three materials of the base material layer, the composite coiled material and the silica gel composite layer are pressed by a pressing roller, so that the three materials are tightly adhered and compounded;
step S8: and compounding a release layer at the silica gel position of the silica gel compound layer, and cutting and forming by a forming cutting die.
Compared with the prior art, the invention has the following advantages:
the composite wound dressing and the preparation process thereof are convenient to use, the intermediate layer is wrapped in the middle by attaching the substrate layer and the silica gel composite layer, so that the dressing is firmly fixed, the dressing is prevented from falling off in a layered manner, the energy consumption is low, the production efficiency is higher, and the liquid absorbing capacity of the product is greatly improved. Meanwhile, the dressing water-blocking bacteria-blocking agent has self-adhesion, good application property and simpler and more convenient clinical operation.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, preferred embodiments of the present invention will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1 to 3, the invention provides a composite wound dressing, which comprises a release layer 1, a silica gel composite layer 13, an intermediate layer and a substrate layer 14, wherein a cavity is formed between the silica gel composite layer 13 and the substrate layer 14, the intermediate layer is arranged in the cavity, the silica gel composite layer 13 is provided with a window, and the size of the window is smaller than that of the intermediate layer;
the silica gel composite layer 13 sequentially comprises a silica gel 2, a polyurethane film 3 and a polyacrylate adhesive 4 from top to bottom, the middle layer sequentially comprises a contact layer 5, a first bonding layer 6 and a moisture absorption layer 7 from top to bottom, and the base material layer 14 sequentially comprises a second bonding layer 8 and a waterproof breathable layer 9 from top to bottom.
Further, in another embodiment, the silicone gel composite layer 13 and the second adhesive layer 8 are both provided with through holes.
Further, in another embodiment, the contact layer 5 is a gel fiber non-woven fabric, the moisture absorption layer 7 is polyurethane foam or polyvinyl alcohol foam, the waterproof and breathable layer 9 is a polyurethane film 3 or polyurethane elastic non-woven fabric, the first adhesive layer 6 is a hot melt adhesive net film or a mesh point film, and the second adhesive layer 8 is a pressure sensitive adhesive.
Polyurethane foam or polyvinyl alcohol foam is soft and elasticSex, does not press the wound, can prevent pressure sore bedsores; the polyurethane film 3 has the functions of water resistance and bacteria resistance, greatly reduces the pollution, infection and inflammation of microorganisms of wounds, and has extremely high water vapor transmittance, wherein the water vapor transmittance is more than 2000 g/(24 h x m) 2 );
Further, in another embodiment, the material of the gel fiber nonwoven fabric is one or more of alginate fibers, modified cellulose fibers, modified chitosan fibers, and polyvinyl alcohol fibers.
Further, in another embodiment, the gel fiber nonwoven fabric has a gram weight of 80 to 180g/m 2 The thickness is 1.0-5.0 mm, the gram weight of the first bonding layer 6 is 8-50 g/m 2 The thickness of the moisture absorption layer 7 is 2-5 mm.
Further, in another embodiment, the thickness of the waterproof and breathable layer 9 is 10-150 μm, and the gram weight of the pressure-sensitive adhesive is 10-40 g/m 2 。
Further, in another embodiment, the polyurethane film 3 has a thickness of 10 to 40 μm, and the silicone gel 2 has a gram weight of 30 to 300g/m 2 The gram weight of the polyacrylate adhesive 4 is 10-40 g/m 2 。
Further, in another embodiment, the shape of the through hole is a circle, a diamond, or a polygon.
Further, in another embodiment, the release layer 1 includes a first release film 15 and a second release film 16, where a bending portion 151 is disposed at one end of the first release film 15 near the middle of the wound dressing, and the second release film 16 partially covers the bending portion 151 of the first release film 15.
Due to the structure, the release layer is convenient for a user to tear off.
According to another aspect of the present invention, there is provided a process for preparing a composite wound dressing comprising the steps of:
step S1: unreeling and flatly paving the contact layer 5, the first bonding layer 6 and the moisture absorption layer 7, and putting the materials into a tentering shaping oven 10 for shaping, wherein the temperature of the oven is 90-200 ℃, the drying time is 10-600 s, and the material entering speed is 1-10 m/min;
step S2: rapidly pressing through two press rolls 11, and cooling and shaping at room temperature to prepare a composite coiled material 12;
step S3: respectively unreeling the substrate layer 14, the composite coiled material 12, the silica gel composite layer 13 and the release layer 1 in multi-station dressing equipment;
step S4: the composite coiled material 12 is cut into a sheet shape through a first cutter 17 after unreeling, and is attached to the pressure-sensitive adhesive of the unreeled substrate layer 14;
step S5: unwinding the silicone gel composite layer 13, and attaching the edges of the polyacrylate adhesive 4 with one side of the adhesive facing the pressure-sensitive adhesive of the substrate layer 14;
step S6: the silicone gel composite layer 13 is provided with a window in the middle through a second cutter 18;
step S7: the three materials of the base material layer 14, the composite coiled material and the silica gel composite layer 13 are pressed by the pressing roller 11, so that the three materials are tightly adhered and compounded;
step S8: and compounding the release layer 1 at the silica gel 2 of the silica gel compound layer 13, and cutting and forming by a forming cutter die 19.
The composite wound dressing has elasticity, has a self-adhesive function, is not adhered to a wound, and is comfortable to wear by a patient. The outer layer has the performance of water blocking and bacteria blocking, prevents wound infection and simplifies nurse operation. The liquid absorption amount of the dressing is more than 40 g/square meter, and the dressing can absorb the seepage permanently, and the service time is up to 7 days.
After absorbing moisture or absorbing wound seepage, the peel strength between the contact layer 5 and the moisture absorption layer 7 after moisture absorption is greater than 0.6N/cm, the bonding strength between the moisture absorption layer 7 and the outer layer is greater than 0.2N/cm, and the composite dressing has higher liquid absorption capacity than that of a common composite dressing, has high bonding strength between the layers and is not easy to separate and fall off.
The composite wound dressing of the present invention and its manufacturing process can be easily manufactured or used by those skilled in the art from the description of the present invention and the accompanying drawings, and can produce the positive effects described in the present invention.
Unless specifically stated otherwise, in the present invention, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present invention are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.