JP2012081045A - Pad for wound surface, and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pad for a wound surface excellent in adhesiveness to a skin, having expandability caopable of following according to the movement of a body, hardly adhering to the wound surface, and the manufacturing method of the same.SOLUTION: The pad for the wound surface has a liquid absorbing layer having expandability and capable of absorbing components derived from a living body and a resin layer having opening parts, a liquid absorbing layer and constituting material does not project from the resin layer and the strength when extending 50% in at least one direction of the pad for the wound surface is 8N/50 mm width or less. In the manufacturing method, the resin layer having the opening parts is formed by adding a resin material to the liquid of absorbing layer constituting material.

Description

  The present invention relates to a wound pad that can absorb biological components such as blood and body fluid, and a method for producing the same.

  Conventionally, bandages have been used to protect wounds on the skin surface. This adhesive bandage generally has a support film coated with an adhesive, a pad made of gauze placed on the adhesive of the support film, and a release paper that covers and protects the pad until use. It has a structure adhered to the agent. Since such a bandage is insufficient in elasticity as a whole bandage, when it is applied to a bent part such as a finger, it cannot follow the shape of the body and has insufficient adhesion to the skin. In addition to not being able to fully follow the shape of the body, it is not easy to peel off from the skin because it cannot respond to the movement of the body. Therefore, it is preferable that the adhesive bandage has a stretchability that can follow the shape and movement of the body as a whole.

  As an adhesive bandage having such elasticity, “an emergency bandage having a support film, an adhesive layer provided on the support film, and a pad disposed on the adhesive layer. The support film has a 50% elongation modulus of 0.5 to 10 N / cm and an elongation recovery rate of 40% or more, and the pad has a 50% elongation modulus of 0.05 to 10 N / cm and an elongation recovery rate of 40% or more. An emergency bandage "(Patent Document 1) has been proposed. It is disclosed that a knitted fabric, a nonwoven fabric including latent crimped fibers, a foamed resin sheet, and a film-like sheet made of an elastomer can be used as the pad.

Similarly, as the stretchable nonwoven fabric that can be used for bandages, consists of at least two kinds of materials as "basis weight 50 to 80 g / ^{m 2} of heat-crimped fibers and basis weight 5 to 50 g / ^{m 2} of hydrophilic fibers fibers "A method for producing a stretchable nonwoven fabric with water absorption, characterized in that the web is entangled with a fiber under a fluid action, and then the crimped treatment is performed on the thermally crimpable fiber under heating" (Patent Document 2). Proposed.

  However, these stretchable pads adhere to the skin wound surface and may cause great pain to the user when the adhesive bandage is peeled off. In particular, the pad was prominent when the constituent material such as a nonwoven fabric contains fibers.

JP 2007-117513 A JP-A-4-100958

  The present invention was made to solve the conventional problems as described above, and has excellent adhesion to the skin, has elasticity that can follow the movement of the body, and is difficult to adhere to the skin wound surface. An object of the present invention is to provide a pad for a surface and a manufacturing method thereof.

  The invention according to claim 1 of the present invention is a wound surface pad comprising a liquid-absorbing layer having elasticity and capable of absorbing a biological component, and a resin layer having an opening. The wound surface pad, characterized in that the liquid-absorbing layer constituting material does not protrude and the strength at 50% elongation in at least one direction of the wound surface pad is 8 N / 50 mm width or less. .

  The invention according to claim 2 of the present invention is the wound surface according to claim 1, wherein the resin layer exists only on one side of the liquid absorption layer, and the resin layer is a wound surface contact portion. For pad. "

  The invention according to claim 3 of the present invention is "the wound surface pad according to claim 1 or 2, wherein the liquid absorbing layer constituting material is not entangled with the resin layer."

  The invention according to claim 4 of the present invention is “to form a resin layer having an opening by applying a resin material to a liquid-absorbing layer constituting material having elasticity and capable of absorbing a biological component. A method for producing a wound surface pad, wherein a resin material is applied so that the liquid absorbing layer constituting material does not protrude from the resin layer, and the strength at 50% elongation in at least one direction of the wound surface pad is 8 N / A method for producing a wound surface pad, characterized by having a width of 50 mm or less. "

  In the invention according to claim 1 of the present invention, since the strength at 50% elongation in at least one direction of the wound surface pad is 8 N / 50 mm width or less, it has excellent adhesion to the skin and responds to the movement of the body. Stretchable to follow. Moreover, since the liquid absorption layer constituent material does not protrude from the resin layer, it is difficult to adhere to the skin wound surface. In other words, since the liquid-absorbing layer constituent material can absorb biological components, if the liquid-absorbing layer constituent material protrudes from the resin layer, the liquid-absorbing layer constituent material easily adheres to the biological component, but it absorbs from the resin layer. Since the liquid layer constituent material does not protrude, it is difficult to adhere to the skin wound surface. In addition, since the resin layer has an opening, the biological component is quickly transmitted through the resin layer, and is absorbed and held by the liquid absorption layer.

  In the invention according to claim 2 of the present invention, since the resin layer exists only on one side of the liquid absorption layer and the resin layer is a wound surface contact portion, it is difficult to adhere to the skin wound surface.

  In the invention according to claim 3 of the present invention, since the liquid absorbing layer constituting material is not entangled with the resin layer, it is difficult to adhere to the skin wound surface. In other words, the liquid absorption layer constituent material is entangled with the resin layer, which means that the liquid absorption layer constituent material protrudes from the resin layer and easily adheres to biological components. Is not entangled and the liquid-absorbing layer constituting material is not in a state of protruding from the resin layer, and therefore it is difficult to adhere to the skin wound surface.

  Invention of Claim 4 of this invention can manufacture the pad for wound surfaces which is excellent in adhesiveness with skin, has the elasticity which can track according to a motion of a body, and is hard to adhere to a skin wound surface. .

The top view which shows the arrangement | positioning state of the convex part in the engraving roll surface used in the Example

  The liquid-absorbing layer constituting the wound surface pad of the present invention is such that the wound surface pad (hereinafter sometimes simply referred to as “pad”) has elasticity, and is a biological component that is the original performance of the pad. Must be able to absorb liquid. The term “stretchability” means that the strength at 50% elongation in at least one direction is 8 N / 50 mm width or less. Preferably it is 6N / 50mm width or less, More preferably, it is 4N / 50mm width or less, More preferably, it is 2N / 50mm width or less.

  “Strength at 50% elongation” in the present invention refers to a position where a test piece was pulled at a pulling speed of 500 mm / min using a constant speed extension type tensile tester at a gripping interval of 200 mm and extended by 50% (holding interval). Is measured on three test pieces, and the arithmetic average value is taken as the strength at 50% elongation.

  In addition, “being able to absorb biologically derived components” means that the amount of water absorption is 40 g / 5 g or more. The biological component is a biological component generated on the wound surface, and examples thereof include blood and body fluid.

  Specific examples of such a pad include, for example, (1) a non-woven fabric containing latently crimped fibers, (2) a parallel web in which fibers are oriented in one direction, prepared using a card machine or an air lay machine. And (3) a non-woven fabric having a fiber orientation unidirectional by stretching the non-woven fabric manufactured by the spunbond method in a uniaxial direction. Among these, (1) Nonwoven fabrics containing latently crimped fibers are suitable because they are excellent in stretchability.

  A pad made of a nonwoven fabric containing latent crimped fibers that is suitable will be described. Examples of the latent crimped fiber include a composite fiber in which a plurality of resins having different heat shrinkage rates are combined, and a fiber in which a specific heat history is applied to a part of the fiber. More specifically, as the composite fiber, an eccentric core-sheath structure or a side-by-side structure can be preferably used. As a combination of resins having different heat shrinkage rates, for example, various synthetic resins such as polyester-low melting point polyester, polyamide-low melting point polyamide, polyester-polyamide, polyester-polypropylene, polypropylene-low melting point polypropylene, polypropylene-polyethylene are combined. Things can be used. In particular, latently crimped fibers made of a combination of polyester-low-melting polyester or polypropylene-low-melting polypropylene are preferable because of excellent chemical resistance and elongation properties. In addition, as the latent crimped fiber having a specific heat history applied to a part of the fiber, for example, a fiber made of a thermoplastic resin such as polyester or polyamide, passing through one side of the fiber while being applied to a hot blade or the like is used. it can.

The fineness of the latent crimped fiber is not particularly limited, but is preferably 5.6 dtex or less, more preferably 3.3 dtex or less, and even more preferably 2.8 dtex or less. More preferably, it is 5 dtex or less. The lower limit of the fineness is not particularly limited, but when the fiber web is formed by a dry method, the fiber fineness is set to 0. 0 so that the fiber web having a uniform texture can be formed and the tensile stretchability is excellent. It is preferably 5 dtex or more, and more preferably 0.8 dtex or more. In addition, when two types of latent crimped fibers having different fineness are included, it is preferable that the average fineness calculated by the following formula is within the fineness range. Moreover, it is preferable that the value calculated similarly also exists in the said fineness range also when three or more types of latent crimp fibers with different fineness are included.
Fav = 1 / {(Pa / 100) / Fa + (Pb / 100) / Fb}
Here, Fav is the average fineness (unit: dtex), Pa is the mass ratio (unit: mass%) of one fiber (fiber A) in the fiber web, Fa is the fineness of fiber A (unit: dtex), and Pb is The mass ratio (unit: mass%) of the other fiber (fiber B) in the fiber web, and Fb mean the fineness (unit: dtex) of the fiber B, respectively.

  The fiber length of the latent crimped fiber is not particularly limited, but is preferably 80 mm or less, more preferably 70 mm or less, and still more preferably 60 mm or less. The lower limit of the fiber length is not particularly limited, but when the fiber web is formed by a dry method, it is preferably 25 mm or more and 30 mm or more so that a fiber web with a uniform texture can be formed. Is more preferable.

  It is sufficient if such latent crimped fibers are included, but it is preferable that 20 mass% or more of the entire nonwoven fabric constituting fibers are latent crimped fibers so that the stretchability is excellent. The greater the amount, the better the adhesion with the skin, and the elasticity that can follow the movement of the body, so it is preferable to include 50 mass% or more, more preferably 70 mass% or more, and more preferably 80 mass% or more. preferable.

  The fibers other than the latently crimped fibers are not particularly limited, but are preferably fibers excellent in liquid absorbency of biological components, such as water absorbent fibers (rayon fiber, tencel fiber, lyocell fiber, cotton). Fiber etc.) can be used. Such a water-absorbing fiber is preferably 80 mass% or less, more preferably 50 mass% or less, and even more preferably 30 mass% or less, based on the relationship with the latent crimped fibers. More preferably, it is 20 mass% or less.

  The manufacturing method of the pad containing such latent crimped fibers is not particularly limited. For example, the latent crimps may be formed by a dry method such as a card method or an airlaid method, a wet method, or a direct method such as a spunbond method. After forming a fiber web containing fibers and intertwining them to impart form-maintaining properties, it can be produced by expressing the crimps of the latent crimped fibers.

  Examples of the entanglement method include a method using a needle and a method using a fluid flow such as a water flow. According to the method using a needle, the liquid absorption layer having a thickness of about 0.5 to 1.5 mm has a feature that it has cushioning properties and can protect the affected area from external stimuli. According to a method using a fluid flow such as a water flow, a relatively thin liquid-absorbing layer of about 0.3 to 1 mm can provide a feeling of sticking without a sense of incongruity.

  Moreover, in order to express the crimp of a latent crimp fiber, a heat processing can be mentioned, for example. Examples of the heating means include hot air dryers, infrared lamps, heating rolls, etc., but strong pressure from solids such as hot air dryers, infrared lamps, etc. so that the crimps of the latent crimped fibers are sufficiently developed. It is preferable to carry out under conditions that do not apply. In particular, it is preferable that the crimped fibers are heated while overfeeding in consideration of the shrinkage of the fiber web due to the expression of crimps so that the latently crimped fibers exhibit sufficient crimps and excellent stretchability. .

Basis weight of the liquid-absorbent layer of the present invention, but is not particularly limited in thickness, weight per unit area is preferably a 40 to 120 g / ^{m 2,} more preferably from 50~110g / ^{m 2,} 60~100g even more preferably a / ^{m 2.} This is because if the basis weight is less than 40 g / m ^2, it is difficult to produce the liquid-absorbing layer and the durability may be inferior, and if it exceeds 120 g / m ² , it tends to be bulky and inferior in elasticity.

  The pad of the present invention includes a resin layer having an opening in addition to the liquid absorbing layer as described above. However, since the liquid absorbing layer constituent material does not protrude from the resin layer, it is difficult to adhere to the skin wound surface. In addition, since the resin layer has an opening, the living body-derived component quickly permeates the resin layer, and is absorbed and held by the liquid absorption layer.

  When the liquid absorption layer constituent material does not protrude from the resin layer, the liquid absorption layer constituent material is observed on the side opposite to the liquid absorption layer side of the resin layer when the cross section in the thickness direction of the pad is observed. I can't. For example, (1) the thickness of the resin layer is 10 μm or more, (2) the opening ratio of the resin layer is 60% or less, and (3) the liquid-absorbing layer constituting material after the resin layer is formed. By satisfying all of these three requirements, for example, a method of not performing the projecting operation (for example, water entanglement), the liquid absorbing layer constituting material can be in a state of not projecting from the resin layer.

  Furthermore, although the pad of the present invention has a resin layer, the strength at the time of 50% elongation in at least one direction is 8 N / 50 mm width or less, and it has excellent adhesion to the skin and can stretch according to the movement of the body. Have The direction having such stretchability may be any direction. This means that the smaller the strength value at the time of 50% elongation, the easier it is to stretch. Therefore, it is preferably 7N / 50mm width or less, more preferably 6N / 50mm width or less, and 5N / 50mm. More preferably, it is less than the width.

  The “opening” means that the living body-derived component has an opening that can reach the liquid absorption layer, and does not need to be an opening that penetrates from one side of the resin layer to the other side. However, an opening penetrating from one side to the other side is preferable because the biological component can be efficiently transmitted to the liquid absorption layer. The aperture ratio is preferably 20 to 60%, more preferably 25 to 55%, and still more preferably 30 to 50%. If it is less than 20%, it may not be possible to sufficiently absorb the biological component, and if it exceeds 60%, the liquid-absorbing layer constituting material (especially fibers) can easily come into contact with the wound surface through the opening. This is because the surface tends to adhere easily. The “aperture ratio” means the percentage of the opening on the resin layer projection surface with respect to the entire resin layer including the opening.

  Examples of such a resin layer include (1) a transferred resin layer, (2) a layer made of an open elastic film (for example, a urethane film layer), (3) a layer made of a resin net, and (4) an elastic film. And a woven / knitted layer made of a stretchable resin, and (5) a nonwoven fabric layer made of a stretchable resin. Among these, the resin layer to which the resin is transferred is suitable because it is not subjected to process stress until just before transfer and it is easy to manufacture a pad having excellent stretchability.

  Since the resin constituting the resin layer is also preferably stretchable, it is preferably composed of a thermoplastic elastomer, rubber or the like. Among these, the thermoplastic elastomer is transferred in a softened or molten state to be transferred to the resin layer. Is preferable. Examples of the thermoplastic elastomer include styrene thermoplastic elastomer, olefin thermoplastic elastomer, urethane thermoplastic elastomer, polyester thermoplastic elastomer, polyamide thermoplastic elastomer, 1,2-polybutadiene thermoplastic elastomer, and vinyl chloride. -Based thermoplastic elastomers and fluorine-based thermoplastic elastomers. Among these, styrene-based thermoplastic elastomers are suitable because they are excellent in chemical resistance, stretchability and moldability of the resin layer.

  Examples of suitable styrene-based thermoplastic elastomers include styrene-ethylene-butylene-styrene copolymer (SEBS), styrene-ethylene-propylene-styrene copolymer (SEPS), and styrene-isoprene-styrene copolymer. (SIS), styrene-butylene-styrene copolymer (SBS), and the like. These styrenic thermoplastic elastomers are all commercially available as block copolymer elastomers.

  The thermoplastic elastomer may contain additives such as a plasticizer for adjusting the viscosity and an anti-tacking agent for suppressing the stickiness of the resin.

  The thickness of such a resin layer is not particularly limited, but when the thickness is 10 μm or more, the liquid-absorbing layer constituting material hardly protrudes from the resin layer. Moreover, by making it as thin as 120 μm or less, it is possible to provide a feeling of sticking without a sense of incongruity.

  Such a resin layer may be arranged in any way, but it preferably exists only on one side of the liquid-absorbing layer, and this resin layer is a wound surface contact portion. This is because even if the resin layer comes into contact with the wound surface, the liquid-absorbing layer constituting material does not protrude from the resin layer and is difficult to adhere to the skin wound surface. When the resin layer is present in this manner, the single surface layer of the pad is configured to contact the wound surface. The resin layer may be present in contact with the liquid absorption layer, and the resin layer and the liquid absorption layer may be present as long as the liquid absorption property of the biological component by the liquid absorption layer and the stretchability of the pad are not impaired. It is also possible to interpose another layer between them. However, the resin layer is preferably in contact with the liquid absorbing layer so that the stretchability of the pad is not impaired. Similarly, it is preferable that the pad is composed only of the liquid absorbing layer and the resin layer so that the stretchability of the pad is hardly impaired.

  In the pad of the present invention, it is preferable that the liquid absorbing layer constituting material is not entangled with the resin layer. If the absorbent layer constituent material is entangled with the resin layer, the absorbent layer constituent material protrudes from the resin layer and easily adheres to biological components, but the absorbent layer constituent material must be entangled with the resin layer. This is because the liquid-absorbing layer constituting material is not in a state of protruding from the resin layer and is difficult to adhere to the skin wound surface. In particular, when using a nonwoven fabric containing latently crimped fibers that are suitable as a liquid absorption layer, when the resin layer and the liquid absorption layer are entangled using a water flow or the like, the adhesion problem is likely to occur. If the absorbent layer constituting material is not entangled with the resin layer, the adhesion problem is unlikely to occur.

  Such a pad of the present invention can be used in the same manner as before. For example, when using as a bandage pad, the pad is placed on the support film coated with an adhesive so that the resin layer is on the wound surface contact side (preferably the wound surface contact portion). Furthermore, the adhesive can be adhered to the adhesive so as to cover the pad with release paper, and a bandage can be obtained.

  In the pad of the present invention, for example, the liquid absorbing layer constituting material is formed as described above, and the resin layer as described above is applied to the liquid absorbing layer constituting material to form a resin layer having an opening. When forming, the resin material is applied so that the liquid absorbing layer constituent material does not protrude from the resin layer, and the strength at 50% elongation in at least one direction of the pad can be manufactured to be 8 N / 50 mm width or less. .

  Thus, as a method of applying a resin material so that the liquid absorption layer constituent material does not protrude from the resin layer and forming a resin layer having an opening, for example, (1) a softened or melted resin is transferred, A method in which the thickness of the resin layer is 10 μm or more and / or the opening ratio is 60% or less, and a method in which the entanglement operation is not performed, (2) a softened or melted resin is applied using a hot melt applicator, and the thickness of the resin layer A method in which the thickness is 10 μm or more and / or the opening ratio is 60% or less and the entanglement operation is not performed, (3) an opening stretch film having a thickness of 10 μm or more and / or an opening ratio of 60% or less, a resin net, stretchability While integrating a resin material such as a woven or knitted fabric or a stretchable nonwoven fabric by a method using the fusing property of the resin material itself, a fusing property of a hot melt resin, or a method using the adhesive property of a binder, The method is not performed if operation, can be mentioned.

  In order to set the strength at 50% elongation in at least one direction of the pad to 8 N / 50 mm width or less, it is preferable to use a thermoplastic elastomer having stretchability as described above.

  As described above, since a resin layer to which a resin is transferred is preferable, a method for forming this resin layer will be described. A concave portion of a sculpture roll having point-like and / or linear concave portions on the surface thereof has a softening temperature or higher (preferably melted). The resin is transferred to the liquid-absorbing layer constituent material by bringing the engraving roll into contact with the liquid-absorbing layer constituent material in a state where the resin (preferably the thermoplastic elastomer) is heated and held at a temperature equal to or higher than the temperature. Can do. At this time, if the resin layer is transferred so that the thickness of the resin layer is 10 μm or more and / or the aperture ratio is 60% or less and the entanglement operation between the resin and the liquid-absorbing layer constituent material is not performed, the resin layer to the liquid-absorbing layer It can be in a state in which the constituent material does not protrude. In addition, by using a thermoplastic elastomer as the resin, the strength at 50% elongation in at least one direction can be easily set to 8 N / 50 mm width or more. Moreover, the resin layer which has an opening part by a desired pattern can be formed by adjusting the pattern of the recessed part in this engraving roll. That is, since the resin exists in the region where the resin is transferred, the region where the resin is not transferred forms an opening.

  In addition, the pad in which the resin layer exists only on one side of the liquid absorbing layer can be manufactured by applying the resin material only on one side of the liquid absorbing layer constituting material. In particular, if the resin material is applied so as to be present in the outermost layer, the resin layer becomes a wound surface contact portion.

  Moreover, the pad in which the liquid absorbing layer constituting material is not entangled with the resin layer can be manufactured by not performing an entanglement operation such as applying a fluid flow such as a water flow or a needle after applying the resin layer.

  Examples of the present invention will be described below, but the present invention is not limited to these pads.

Example 1
(Preparation of liquid absorption layer constituent material)
Using 100 mass% of a latently crimped fiber (fineness 2.2 dtex, fiber length 51 mm) configured in a side-by-side configuration with a combination of polyester / low-melting-point polyester, it was opened on a card machine and a cross lay web was formed by a cross wrapper. .

  Next, using a 90 mesh polyester twill net (support), the cross lay web was adjusted to 20 m / min. 4MPa of water flow is ejected from the nozzle plate with a nozzle diameter of 0.13mm and nozzle pitch of 0.6mm to both sides of the cross lay web, and the latent crimped fibers are entangled. A nonwoven fabric was prepared.

  Then, after the hydroentangled nonwoven fabric is dried at 110 ° C., a heat treatment at a temperature of 185 ° C. with a hot air dryer is applied for about 15 seconds while overfeeding, thereby causing the crimps of the latent crimped fibers to be expressed. A constituent material was produced. The physical properties of the liquid-absorbing layer constituting material are as shown in Table 1.

(Manufacture of pads)
First, as shown in FIG. 1, an engraving roll having convex portions arranged on the surface in a staggered manner was prepared. That is, the engraving roll having cylindrical convex portions (diameter: 0.8 mm, height: 0.2 mm) at a pitch of 1.5 mm in both the width direction A and the circumferential direction B of the engraving roll. Prepared.

Next, after pouring molten styrene-ethylene-butylene-styrene copolymer (SEBS) into the concave portions (regions other than the convex portions) of the engraving roll, transfer to only one side of the liquid absorbing layer constituting material, A pad having a resin layer corresponding to the concave pattern of the engraving roll was manufactured. When the cross section in the thickness direction of this pad was observed with an electron microscope, the liquid absorbing layer constituting material did not protrude from the resin layer. Moreover, this pad contact | abutted with the liquid absorption layer only on the single side | surface side of the liquid absorption layer, and had a resin layer (wound surface contact part, one surface layer). Furthermore, the absorbent layer constituting fibers were not entangled with the resin layer. The resin layer had a through opening (opening ratio: 40%) corresponding to the convex part of the engraving roll. The basis weight and thickness of the resin layer were 30 g / m ² and 60 μm, respectively. Table 2 shows the physical properties of this pad.

(Example 2)
(Preparation of liquid absorption layer constituent material)
A liquid-absorbing layer constituting material having the physical properties shown in Table 1 was prepared in the same manner as in Example 1 except that the needle was used and entangled under the conditions of a needle density of 50 / cm ² and a needle depth of 10 mm. .

Thereafter, in the same manner as in Example 1, a styrene-ethylene-butylene-styrene copolymer (SEBS) was transferred to only one surface of the liquid-absorbing layer constituting material, and a pad having a resin layer corresponding to the concave pattern of the engraving roll. Manufactured. When the cross section in the thickness direction of this pad was observed with an electron microscope, the liquid absorbing layer constituting material did not protrude from the resin layer. Moreover, this pad contact | abutted with the liquid absorption layer only on the single side | surface side of the liquid absorption layer, and had a resin layer (wound surface contact part, one surface layer). Furthermore, the absorbent layer constituting fibers were not entangled with the resin layer. The resin layer had a through opening (opening ratio: 40%) corresponding to the convex part of the engraving roll. The basis weight and thickness of the resin layer were 40 g / m ² and 90 μm, respectively. Table 2 shows the physical properties of this pad.

(Comparative Example 1)
70 mass% of rayon fiber (fineness 1.7 dtex, fiber length 40 mm) and 30 mass% of polyester fiber (fineness 2.2 dtex, fiber length 51 mm) were mixed, opened with a card machine, and a cross lay web was formed with a cross wrapper. .

  Next, using a 90 mesh polyester twill net (support), the cross lay web was adjusted to 20 m / min. 4MPa water flow is ejected from the nozzle plate with a nozzle diameter of 0.13mm and a nozzle pitch of 0.6mm to both sides of the cross lay web, and the fibers are entangled to produce a hydroentangled nonwoven fabric. And this water-entangled nonwoven fabric was made into the liquid absorption layer constituent material. The physical properties of the liquid-absorbing layer constituting material are as shown in Table 1.

Thereafter, in the same manner as in Example 1, a styrene-ethylene-butylene-styrene copolymer (SEBS) was transferred to only one surface of the liquid-absorbing layer constituting material, and a pad having a resin layer corresponding to the concave pattern of the engraving roll. Manufactured. When the cross section in the thickness direction of this pad was observed with an electron microscope, the liquid absorbing layer constituting material did not protrude from the resin layer. Moreover, this pad contact | abutted with the liquid absorption layer only on the single side | surface side of the liquid absorption layer, and had a resin layer (wound surface contact part, one surface layer). Furthermore, the absorbent layer constituting fibers were not entangled with the resin layer. The resin layer had a through opening (opening ratio: 40%) corresponding to the convex part of the engraving roll. The basis weight and thickness of the resin layer were 40 g / m ² and 90 μm, respectively. Table 2 shows the physical properties of this pad.

(Comparative Example 2)
Laminated crimped fiber (fineness 2.2 dtex, fiber length 51 mm) composed of polyester / low melting point polyester in a side-by-side type is mixed with 70 mass% and rayon fiber (fineness 1.7 dtex, fiber length 40 mm) 30 mass%. The card was opened on a card machine, and a cross lay web was formed with a cross wrapper.

  Next, using a 90 mesh polyester twill net (support), the cross lay web was adjusted to 20 m / min. While being conveyed, a water flow of 4 MPa was ejected from the nozzle plate having a nozzle diameter of 0.13 mm and a nozzle pitch of 0.6 mm to both surfaces of the cross lay web, and the fibers were entangled to produce a hydroentangled nonwoven fabric. .

  Then, after drying the hydroentangled nonwoven fabric at 110 ° C., overheating, a heat treatment at a temperature of 185 ° C. with a hot air dryer is applied for about 15 seconds to develop the crimps of the latent crimped fibers and manufacture a pad. did. Table 2 shows the physical properties of this pad.

(Comparative Example 3)
In the same manner as in Example 1, a liquid absorbing layer constituting material was produced. In addition, after transferring the resin material to the release paper in the same manner as in Example 1, the resin material was peeled off from the release paper and had a through-opening opening (weight per unit: 40 g / m ² , thickness: 90 μm, opening ratio) : 40%).

  Subsequently, after laminating the resin single material on the liquid absorption layer constituting material, using a 90 mesh polyester twill net (support), 20 m / min. 4MPa of water flow is ejected from the nozzle plate with a nozzle diameter of 0.13mm and a nozzle pitch of 0.6mm to both sides of the laminate, while the liquid absorbing layer constituting material and the resin single material are entangled. The pad was produced. When the cross section in the thickness direction of this pad was observed with an electron microscope, the liquid-absorbing layer constituting material was intertwined with the resin layer and protruded. Table 2 shows the physical properties of this pad.

(Measurement of physical properties)
(Weight)
The sample piece was cut into a size of 14 cm × 25 cm and allowed to stand in a standard state at a temperature of 25 ° C. and a relative humidity of 60% for 2 hours. Then, it was weighed to one digit after the decimal point with an electronic balance and converted to a mass per square meter. This operation was performed on three sample pieces, and an arithmetic average value was used as the basis weight.

(thickness)
Using a compression elasticity tester (Lightmatic VL-50, manufactured by Mitutoyo Corporation), the load per 5 cm ^{2 of} load area is 0.98 N, the thickness at 10 sample pieces is measured, and the arithmetic average value is the thickness. Say it.

(Tensile strength and elongation)
A vertical direction test piece, in which the liquid-absorbing layer constituting material or pad is cut into a size of 300 mm in the vertical direction (flow direction during the production of the hydroentangled nonwoven fabric) and 50 mm in the horizontal direction (direction perpendicular to the vertical direction). Three were collected. In addition, three transverse direction test pieces cut to a size of 50 mm in the vertical direction and 300 mm in the transverse direction were collected.

  Subsequently, the tensile strength and elongation rate of these test pieces were measured according to A method (strip method) of JIS L 1096 (general fabric test method) 6.12.1. Using a constant speed extension type tensile tester (Tensilon UCT-500, manufactured by Orientec Corporation) as a tester, it is extended at a gripping interval of 200 mm and a pulling speed of 500 mm / min, and the maximum load until the test piece breaks is pulled. It was strength. Further, the percentage of the elongation of the test piece at the maximum load [= (length at the maximum load) − (grip interval: 200 mm)] with respect to the grip interval (200 mm) was defined as the elongation rate. These measurements were performed three times for each of the vertical direction and the horizontal direction, and the arithmetic average values were taken as the tensile strength and elongation rate.

(Strength at 50% elongation)
Similarly to the measurement of (tensile strength and elongation rate), three vertical direction test specimens and horizontal direction test specimens were sampled, and using a constant speed extension type tensile tester, the holding interval was set to 200 mm, and the longitudinal direction test pieces were measured. Both ends were set, the test piece was pulled at a pulling speed of 500 mm / min, and the stress applied at the position extended 50% (position where the grip interval was 300 mm) was defined as the strength at 50% extension. These measurements were performed three times for each of the vertical direction and the horizontal direction, and the arithmetic average value was defined as the strength at 50% elongation.

(Water absorption)
The amount of water absorption was measured according to the purity test method of absorbent cotton according to the 14th revision Japanese Pharmacopoeia. That is, a test piece having a length of 76 mm and a mass of 5 g was prepared from the liquid-absorbing layer constituting material or the pad. Further, a test basket having a diameter of 50.0 mm, a depth of 80.0 mm, a distance between the wires of 20 mm and a weight of 3.0 g was prepared using a copper wire having a diameter of 0.4 mm. Furthermore, a 200 mm deep water bath in which water having a temperature of 24 to 26 ° C. was stored was prepared.

  Next, the test piece was gently wound into the test basket, and it was gently dropped into the water bath from a height of 12 mm above the water surface of the water bath with the test basket lying down. After leaving the test cage for 3 minutes on the bottom of the water, gently lay it down from the bottom and place it horizontally on a No. 10 sieve wire net for 1 minute to remove the unretained water. did. Thereafter, the test piece was placed in a beaker and weighed, and the water absorption per 5 g of the test piece was calculated from the difference between the test piece (5 g) before water absorption and the sum of the mass of the beaker. In addition, at the time of measuring the water absorption amount of the pad, the measurement was carried out by winding the pad with the resin layer side as the outside.

(Evaluation of surface fluff)
Since the liquid-absorbing layer constituent material (fiber) causes adhesion, it was visually determined whether or not the liquid-absorbing layer constituent material (fiber) had fluff on the surface of the pad on the resin layer side.

  Examples 1 and 2, which are pads of the present invention, were excellent in stretchability in the transverse direction, excellent in adhesion to the skin, and could follow the movement of the body. Moreover, since the liquid absorption layer constituting material did not protrude from the resin layer, there was no surface fluff and it was difficult to adhere to the skin wound surface. Furthermore, the water absorption amount was large and the liquid absorption was excellent.

  On the other hand, the pad of Comparative Example 2 having no resin layer was excellent in stretchability in the weft direction, but had surface fluff and was easy to adhere to the skin wound surface. Further, the pad of Comparative Example 3 is in a state in which the liquid absorbing layer constituting material (fiber) protrudes from the resin layer because the liquid absorbing layer constituting material is entangled with the resin layer, that is, there is surface fluff, so that the skin wound It was easy to adhere to the surface.

  The wound surface pad of the present invention is excellent in adhesion to the skin, has elasticity that can follow the movement of the body, and is difficult to adhere to the skin wound surface, and therefore requires such physical properties. For example, it can be suitably used as a bandage pad, a wound surface protection pad, a hemostatic pad, a breast milk pad, or a decubitus pad.

A Engraving roll width direction B Engraving roll circumferential direction

Claims (4)

It is a wound pad having a stretchable and liquid-absorbing layer capable of absorbing biological components and a resin layer having an opening, and the liquid-absorbing layer constituting material does not protrude from the resin layer. A wound surface pad having a strength at 50% elongation in at least one direction of the wound surface pad of 8 N / 50 mm width or less. The wound surface pad according to claim 1, wherein the resin layer exists only on one side of the liquid absorption layer, and the resin layer is a wound surface contact portion. The wound surface pad according to claim 1 or 2, wherein the resin layer is not entangled with the liquid absorbing layer constituting material. A method for producing a wound surface pad, which has a stretchability and forms a resin layer having an opening by applying a resin material to a liquid-absorbing layer-constituting material capable of absorbing a biological component. A resin material is applied so that the liquid-absorbing layer constituent material does not protrude from the layer, and the strength at 50% elongation in at least one direction of the wound surface pad is 8 N / 50 mm width or less. Manufacturing method of pad for surface.

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