JPH03224557A - Wound surface protective material - Google Patents

Abstract

PURPOSE:To form the wound surface protective material having excellent absorbability and a property to prevent the return of liquid by boring many fine pores on the film surface of a composite sheet of a film and a non-woven fabric, depressing extruded fine pieces thereon, press-welding these pieces to the non-woven fabric, and forming annular spacings between the inner peripheral edges of the fine pores and the outer peripheral edges of the fine pieces. CONSTITUTION:A surface material 1 consists of the composite sheet 6 adhered with the thermal adhesive film 4 and the non-woven fabric 5 and the many fine pores 7 are regularly distributed and bored on the surface of the film 4. The recesses 8 are formed on the film 4 surface of the fibers non-woven fabric 5 in the parts of the respective fine pores 7 and the fine pieces 9 extruded from the fine piece parts at the time of the boring are adhered to the bases. The annular spacings 10 by the rupture of the film 4 are formed between the outer peripheral edges of the fine pieces 9 and the inner peripheral edges of the fine pieces 7. The leaching liquid from the wound surface, therefore, passes the annular spacings 10 from the many fine pores 7 and flow smoothly into the absorbent core material through the non-woven fabric 5. The liquid is thus absorbed and the remaining of the liquid on the film surface is substantially eliminated. The wound surface protective material having the excellent liquid absorbability and the property to prevent the return of the absorbed liquid is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a wound surface protection material used for subcutaneous healing of epilepsy, which has excellent absorption of exudate from the wound surface and prevention of fluid return.

(Prior art) Gauze has been used as a wound surface protection material for a long time, but exudate from the wound surface remains on the wound surface, which coagulates and adheres to the wound surface, or granulation tissue and capillaries dig into the fine details of the gauze. Therefore, when replacing the gauze, it had the disadvantage of peeling off the leprosy and damaging the granulation tissue.

Furthermore, these circumstances basically remain the same even in wound surface protection materials made of nonwoven fabric-like absorbent materials with mesh nets arranged on the wound surface side, which have been widely used in recent years.

To solve the above problem, Japanese Patent Application Laid-Open No. 571536
No. 44 proposes a wound surface protection material in which the wound surface layer is a perforated film and the absorbent intermediate layer is a hydrophilic foam.

(Problem to be Solved by the Invention) However, when covering the absorbent intermediate layer with the above-mentioned conventional perforated film, there are certainly problems such as granulation tissue and capillaries on the wound surface digging into the wound surface layer. However, when the absorbent intermediate layer is compressed by body movement, exudate from the wound surface that has been absorbed by the absorbent intermediate layer flows out onto the wound surface again (called fluid return), solidifies, and adheres to the wound surface. and delay healing.

An object of the present invention is to provide a wound surface protection material that is excellent in absorbing exudate from the wound surface and preventing liquid from returning.

(Means for solving the problem) In order to achieve the above object, a wound surface protection material is provided in which a liquid-permeable surface material is arranged on the front side of an absorbent core material and a backing material is arranged on the back side. As a result of various studies on the surface material that has the role of transferring exudate to the absorbent core material, we created a large number of pores on the film surface of a composite sheet that integrates a film and a nonwoven fabric, and when drilling, the pores are removed. The extruded strips are depressed from the film surface and pressed against the nonwoven fabric, and an annular gap is formed between the inner periphery of the pore and the outer rim of the strip, thereby quickly draining exudate from the wound surface. When the nonwoven fabric passes through the annular gap in the surface material and is absorbed by the absorbent core material, and when the absorbent core material is compressed by body movement, etc., the surface material is also compressed at the same time, causing the small pieces to cave in from the film. The inventors have discovered that the liquid can effectively prevent the liquid from flowing out (liquid returning) from the absorbent core material through the surface material to the wound surface by blocking the pores again and acting as a check valve, thereby achieving the present invention.

That is, the present invention provides a wound protection material in which a backing material is arranged on the back side of an absorbent core material and a liquid-permeable surface material is arranged on the front side, in which the surface material is made of a thermoadhesive film and a thermoplastic fiber. The composite sheet is made of a composite sheet that is thermally bonded to a thin non-woven fabric, and a large number of pores are punched in the film surface of the composite sheet. It is pressed against the nonwoven fabric by recessing from the surface, and an annular gap is formed between the inner circumferential edge of the pore and the outer circumferential edge of the strip, and the thickness of the thermal adhesive film of the surface material 3~
50μ weight, the surface material's thermoplastic fiber nonwoven fabric has a basis weight of 8~
50 g/m'' and a specific volume of 20 to 60 cn?/g.

As the heat-adhesive film for the surface material, polyethylene with a relatively low melting point is preferred from the viewpoint of texture, its thickness is 8 to 50 μm, preferably 10 to 30 μm, and the open area ratio due to pores is 10% or more. .

When the thickness of the film is less than 3 μm, heat shrinkage during processing becomes large, and when it exceeds 50 μm, it is difficult to obtain the desired pores and the texture becomes hard.

In addition, in the wound surface protection material of the present invention, the sunken fragments from the film block the view, thereby suppressing the direct visibility of the exudate from the wound surface absorbed by the absorbent core material. In order to make the film more opaque, it is preferable that the heat-adhesive film is made opaque by adding calcium carbonate or titanium oxide.

The thermoplastic fiber nonwoven fabric used to line the film should preferably have at least a portion of its surface made of fibers of the same material as the film, and if the film is made of polyethylene, the sheath component is polyethylene and the core component is polypropylene or polyester. The fabric weight obtained by thermally processing a composite fiber web of 8 to 50 g/m' and the specific volume of 2 (1-6
Thin non-woven fabric with 0cnf/g, especially basis weight 16-30g/m
No. 2 nonwoven fabric is preferred.

If the basis weight of the nonwoven fabric is less than 8 g/m'', the desired annular gap cannot be obtained between the inner circumferential edge of the pore and the outer circumferential edge of the strip;
If the specific volume is larger than 20 cn/g, the surface material will be bulky. If the specific volume is smaller than 20 cn/g, the liquid passing rate will be slow, and if it exceeds 60 cn/g, the surface material will be bulky.

Methods for forming a large number of pores in a composite sheet made of the above film and nonwoven fabric include truncated cone, truncated pyramid,
Alternatively, the composite sheet is passed between a pair of rollers consisting of a perforated roller and a smooth roller, each of which has a large number of small protrusions on its circumferential surface having a cylindrical or prismatic top surface, and embossing is performed from the film side. It is preferable to make the small protrusions of the perforation roller penetrate through the film.In this case, if the perforation roller is heated to a temperature around the melting point of the film, the small pieces pushed out to the top surface of the small protrusions during perforation will become part of the film. The pores are bonded to the non-woven fabric with their surfaces sunken, and an annular gap is formed between the inner periphery of each pore drilled in the film surface and the outer periphery of each strip that is sunken and bonded to the non-woven fabric. Can be made with structure. 1 perforated on the film surface
The opening size of each pore is 0.5~3-1, and the opening ratio is 10~
50%, the depression depth of the strip is 0.6-1.2 mm)
The ratio of the opening size of the pore to the size of the strip is 1:0.
A ratio of 4 to 1:1 is desirable.

Here, for example, if the diameter of the pore is approximately 1.611+1, the diameter of the strip is approximately 1 mm, and the depth of depression is approximately 1 mm, the inner circumferential edge of the pore and the outer circumferential edge of the strip are The gap area between them is calculated to be approximately 4.1-. (Actually, it is slightly smaller than the calculated value for reasons explained later.) Second, the opening area per hole is 2.0 +7, while the gap area is 4.1-, which is 1. When a perforated film is laminated with a non-woven fabric, the exudate from the wound surface is mixed with the non-woven fabric first.
In contrast, in the composite sheet of the present invention, the contact area is 4.1-, indicating that the exudate is easily transferred to the absorbent core material.

This means that fewer holes are required to transfer the same amount of liquid to the absorbent material, which reduces the possibility of granulation tissue or capillaries being fed through the pores, which is a major feature of the present invention.

Opening ratio is less than 10% and depression depth is 0.6ffim
If the total gap area is small, such as less than The gap area becomes too large and the liquid returns after use.

(Function) The porous film that forms the surface layer of the composite sheet allows liquid to flow to the absorbent core material through its pores, and the nonwoven fabric adhered to the film promotes the movement of liquid to the absorbent core material. This eliminates liquid residue on the film surface, and the sunken pieces prevent liquid backflow and prevent dirt on the absorbent core material from being directly visible through the pores.

(Example) Hereinafter, the present invention will be described in detail based on the drawings. Fig. 1 is a perspective view of the wound surface protection material, and Fig. 2 is a sectional view of the wound surface protection material, in which (1) is the surface material, (2) is the absorbent core material, and (3) is the surface material.
indicates the backing material.

As shown in FIGS. 3 and 4, the surface material (1) is a composite sheet 1-(6) in which an opaque thermoadhesive film (4) and a thin nonwoven fabric (5) of thermoplastic fibers are adhered. ). The heat-adhesive film (4) in this example is a medium-density polyethylene film with a thickness of 20 μm containing calcium carbonate [Bolam 20 (manufactured by Tokuyama Soda Co., Ltd.)].
Density: 0.9 g/CIA) (melting point: 125°C) 1 was used, and the thermoplastic fiber nonwoven fabric (5) was a woven fiber with a sheath component of high-density polyethylene and a core component of polyester [manufactured by Daiwabo Co., Ltd., NBF]. (SH) 3° x 51m
A thin non-woven fabric (apparent thickness of about 0.8+ u
) is used. The opaque heat-adhesive film (4) and the fibrous nonwoven fabric (5) are then heat-bonded, and a large number of pores (7) each having a diameter of 1.5 mm are regularly formed on the surface of the film (4). This large number of pores (
The aperture ratio occupied by 7) is approximately 32% (pore density 18/cd'
).

In addition, the fibrous nonwoven fabric (5) in the area of each pore (7) has a depression (8
) is formed, and a strip (9) extruded from the pore portion during drilling is adhered to the bottom of this depression (8), and the outer peripheral edge of the strip (9) and the pore (7 ), there is an annular gap (lO〉) between the inner peripheral edge of the film (4) and the nonwoven fabric (5) where the film (4) is broken and allows liquid to enter from the surface of the film (4) into the nonwoven fabric (5).
The structure has been formed.

The surface-perforated composite sheet (6) having the above-mentioned structure is, for example, as shown schematically in FIGS. Using a device in which a roller (12) and a roller (13) with a smooth surface are arranged one above the other with a slight gap (to the extent that they do not contact each other), the perforating roller (12) is heated at 130 to 135°C with a smooth surface. Heat a roller (13) to 90 to 95°C and rotate it in the direction of the arrow while stacking the heat-adhesive film (4) and the heat-adhesive nonwoven fabric (5) vertically from one side of the device. It can be obtained by passing between both rollers (12) and (13).

That is, when the heat-adhesive film (4) and the heat-adhesive non-woven fabric (5) are fed between the heated rollers (12>(13) while overlapping each other, the film (4)
The protrusions (11) of the perforating roller (12) penetrate and perforate the softened film (4) as if by melting, and the top surface of each small protrusion (11)
IIA) removes the circular strip (9) away from the perforation with a non-woven fabric (
5) It can be manufactured by pressing inward and pressing toward the lower surface of the nonwoven fabric (5), and thermally bonding the strip (9) to the nonwoven fabric (5). Of course, instead of the perforation roller (12) and smooth roller (13), a punching method can also be used in which a heated perforation plate provided with a large number of small protrusions is moved up and down onto the table.

When the thermoplastic heat-adhesive film (4) is perforated using the heated perforation roller (12) or perforation plate as described above, the inner periphery of the perforation becomes Place the film (4) in contact with the side of the small projection <11>.
) is softened or melted, and as shown in Figure 1, one part of the filament is stretched to form a filamentous body (14), which forms a thread-like body (14) and forms a filament (14), which forms a filament (14) that connects to the inner peripheral edge of the pore (7). In some cases, it remains in a row between the outer peripheral edge of the strip (9).

However, this filamentous body (14) is small and does not significantly affect the annular gap described above.

When the composite sheet of the present invention is used as a surface material for a wound surface protection material, the shape of the above-mentioned strip (9) is such that it swells toward the pores (7) as shown in FIG. Preferably, it is possible to prevent the liquid from remaining on the strip (9), thereby further improving the cleanliness after use. Such a swollen strip (9) can be obtained by using a drilling protrusion that is concave on the top surface.

Furthermore, if a small cylindrical perforation protrusion with approximately the same diameter in the height direction is used, a strip (9) of approximately the same size as the opening of the pore (7) will be inserted into the nonwoven fabric ( 5) Color or film of liquid adhered to the absorbent core material (4)
It becomes more difficult to see from the side, and a wound surface protection material comprising such a surface material has excellent liquid absorbency and ability to prevent the absorbed liquid from returning.

In order to confirm the performance of the wound surface protection material of the present invention described above, five types of wound surface protection materials belonging to the present invention and four types of comparative examples were prepared as shown in Table 1. The results are shown in Table 2.

Margin Table 2 Below, the absorbent core material has a basis weight of 100g/+ for both Examples and Comparative Examples.
A needle-punched nonwoven fabric with a diameter of 70 μm was used as the backing material.

In addition, as a result of visually observing the state from the surface material side after the artificial blood was absorbed into the absorbent core material, the color of the blood was not noticeable in the examples, but was quite noticeable in the comparative examples.

Test method (1) lαα body absorption time The above leakage preventive material was placed under the above absorbent core material, each surface material in Table 1 was placed on top of the absorbent core material, and under a load of 13.6 g/cn ( , artificial blood is dropped 10 m from the north of the surface material, and the time it takes for the artificial blood to be absorbed into the absorbent core material.

(2) Liquid return l: After absorbing the artificial blood, leave it for 1 minute and the weight a
Three filter papers (7 cm x 12 cm) that had been determined to be ill were stacked and placed on top of the surface material, a load of 75 g/- was applied to the entire surface, and the filter paper was left for 1 minute, then the weight of the filter paper was measured and the liquid return rate was calculated. .

The artificial blood is made of 25% glycerin and 74.8% distilled water.
, Congo Red at a ratio of 0.2%, and had a slightly higher viscosity than normal artificial blood.

(Effect of the invention) As described above, the wound surface protection material according to the present invention has an absorbent core material (2
), in which a liquid-impermeable banking material (3) is arranged on the back side and a liquid-permeable surface material (1) is arranged on the front side, the surface material (1) is Opacified thermoadhesive film (4) and thin non-woven fabric of thermoplastic fibers (5)
) is thermally bonded to the composite sheet (6), and the film (4) surface of the composite sheet h (6) has many pores (
When the pores (7) are formed, the strips (9) pushed out from the pores sink down from the film surface and are pressed to the nonwoven fabric (5), and the pores ( Since an annular gap (10) is formed between the inner circumferential edge of the strip (7) and the outer circumferential edge of the strip (9), when this is used as a wound surface protection material, water will be discharged to the side of the film (4). The exudate from the wound surface passes through the annular gap (10) from the numerous pores (7), passes through the nonwoven fabric (5), flows smoothly into the absorbent core material, and is absorbed, so that almost no liquid remains on the film surface. Also, since the liquid does not return to the film side, exudate from the wound surface does not coagulate and adhere to the wound surface and delay healing.Furthermore, the bottom of the depression (8) of each pore (7) Since there are strips (9) separated from the film, dirt on the absorbent core material is difficult to see from the film surface side even after use, and the feeling of uncleanliness can be eliminated.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and include the first embodiment.
Figures 2 and 2 are a perspective view and a cross-sectional view of the wound surface protection material, Figures 3 and 4 are an enlarged cross-sectional view and a partial plan view of the composite sheet, Figure 5 is a schematic diagram of the method for manufacturing the composite sheet, and Figure 6
The figure is an enlarged view of the main part of Figure 5, Figures 7, 8 and 9.
The figures are enlarged sectional views showing other aspects of the perforation. 1. Surface material 2: Absorbent core material 3: Packing material 4: Heat adhesive film 5: Heat adhesive nonwoven fabric
6: Composite sheet 7: Pore 8: Hollow 9: Strip 10; Annular gap 11: Protrusion 12: Perforation roller: Smooth roller 14: Thread-like body

Claims (3)

[Claims] (1) In a wound protection material in which a backing material is arranged on the back side of an absorbent core material and a liquid-permeable surface material is arranged on the front side, the surface material is a thin nonwoven fabric made of a thermoadhesive film and thermoplastic fibers. The film surface of the composite sheet is made up of a composite sheet that is thermally bonded to the surface of the composite sheet, and a large number of pores are punched in the film surface of the composite sheet. A wound surface protection material, characterized in that the material is crimped onto the nonwoven fabric, and an annular gap is formed between the inner peripheral edge of the pore and the outer peripheral edge of the strip. (2) The thickness of the thermal adhesive film of the surface material is 3 to 50 μm
The wound surface protection material according to claim 1. (3) The basis weight of the thermoplastic fiber nonwoven fabric of the surface material is 8 to 50 g.
The wound surface protection material according to claim 1, which has a specific volume of 20 to 60 cm^3/g.