JP5973490B2 - Method for producing wound covering sheet - Google Patents

Description

  The present invention relates to a wound covering sheet that protects a wound on a human body, and more particularly to a wound covering sheet that is optimal for protecting a wound due to bed slip.

  Conventionally, bedsore prevention sheets for preventing and protecting bedsores caused by bedridden sick people and elderly people sleeping for a long period of time, and treatment pads for treating bedriddens that have developed have been proposed. Yes.

  As the floor slip prevention sheet, a synthetic resin cap film having a projection of a predetermined diameter on a synthetic resin back film is attached to the bubble head side (surface side) of the bubble sheet bonded to form bubbles. In addition, there has been proposed a laminated sheet having a sandwich structure in which a cap sheet is sandwiched by adhering a sheet of woven fabric, nonwoven fabric or paper made of natural fiber or synthetic fiber. (See Patent Document 1.)

  The treatment pad is a wound treatment pad used in wet therapy, which has a plurality of holes, holds the wound in a wet state, and the exudate from the wound through the holes. A therapeutic pad that can be applied to petrolatum on part or all of the contact surface of the retaining layer with the skin. Has been proposed. (See Patent Document 2.)

JP 2007-307133 A JP 2008-200341 A

  However, the bed slip prevention sheet according to Patent Document 1 can prevent the occurrence of bed slip by dispersing the body pressure of a bedridden human body, but has a problem that it is not effective for treating bed slip that has already occurred. there were. In addition, the treatment pad according to the above-mentioned Patent Document 2 is highly cost-effective because wet therapy can be performed using an inexpensive food wrap, but the bed slippage is worsened by stimulation caused by contact with the bed slip that has developed in the human body. There is a problem that the treatment cannot be completely prevented and the therapeutic effect cannot be obtained sufficiently.

  In order to solve the above problems, an object of the present invention is to provide a wound covering sheet that is effective in treating wounds such as bed slips using an inexpensive material.

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the porous film that contacts the wound, the water-absorbing sheet that absorbs exudate from the wound, and the exudate absorbed in the water-absorbing sheet leaks to the outside. A wound-covering sheet comprising a plurality of layers in the order of the porous film, the water-absorbing sheet, and the waterproof film, wherein the porous film is mixed with a foaming agent from a melting tank. A tubular film is formed by extrusion molding means that elutes thermoplastic resin and is provided with an annular slit, and the tubular film is pulled up while contacting along the outer peripheral edge of a disk in which the inner peripheral wall is laminated in a plurality of steps at regular intervals. In addition, the diameter is gradually increased up to the third to fourth stages of the laminated disk, and the resin material of the tubular film is configured to be pulled up without being gelled. One is a laminated disk with the same diameter, and the resin raw material is gelled and pulled up, and further, the disk end edge of the laminated disk on which the cylindrical film slides has a triangular cross-section with an inclined surface as a bubble rupture means The synthetic resin of the film gels the air bubbles contained in the tubular film by forming air pocket space and pumping air from the air outlet of the hollow pipe that penetrates the center of each disk between the stacked disks. It is characterized in that it is stretched in a state where it is not formed, and is bubbled in a state where it is gelled to form a number of bubble-breaking holes in a cylindrical film .

The invention according to claim 2 is characterized in that, in the wound covering sheet according to claim 1, a sticking part for sticking to the wound is formed on the upper surface of the waterproof film in a cross shape .

According to the wound covering sheet according to claim 1, a porous film that contacts the wound, a water absorbent sheet that absorbs exudate from the wound, and a waterproof film that prevents the exudate absorbed in the water absorbent sheet from leaking to the outside. And a wound covering sheet comprising a plurality of layers in the order of the porous film, the water absorbing sheet, and the waterproof film, wherein the porous film elutes a thermoplastic resin mixed with a foaming agent from a melting tank. The cylindrical film is formed by an extrusion molding means provided with an annular slit, and the cylindrical film is configured so that the inner peripheral wall is pulled up while contacting along the outer peripheral edge of a disk in which a plurality of layers are laminated at a constant interval. In addition, the diameter of the laminated disk is gradually increased up to the third to fourth stages, and the resin material of the tubular film is configured to be pulled up without gelation, and the upper part has the same diameter. As a layered disk, the resin material is gelled and pulled up, and at the tip of the disk of the laminated disk on which the cylindrical film slides, an air pocket space with a triangular cross section is formed by an inclined surface as a bubble rupture means In addition, the air contained in the cylindrical film is expanded in a state where the synthetic resin of the film does not gel by pumping air from the air outlet of the hollow pipe that penetrates the center of each disk between the stacked disks. In the gelled state, the foam is broken to form a large number of bubble-breaking holes in the cylindrical film, so that the exudate from the wound is quickly absorbed and retained in the water-absorbing sheet through the porous film in contact with the wound. This makes it possible to provide a wound covering sheet that keeps the wound dry and that is less irritating to the wound. It can be improved in the wound therapeutic effect.

According to the wound covering sheet according to claim 2, since the sticking part for sticking to the wound is formed on the upper surface of the waterproof film in a cross shape, the wound covering sheet is stuck to the wound of the human body. And replacement work can be performed promptly.

It is the top view and bottom view of a wound covering sheet in the Example of this invention. It is sectional drawing which shows the structure of the wound covering sheet in the Example of this invention. It is a figure explaining the usage example of the wound covering sheet in the Example of this invention. It is an expansion perspective view explaining the structure of the porous film of the wound covering sheet in the Example of this invention. It is a figure explaining the sticking part of the wound covering sheet in the Example of this invention. It is a figure which shows the wound covering sheet manufacturing apparatus used for manufacture of the wound covering sheet of this invention. It is a partially expanded explanatory view of FIG. It is a partially expanded explanatory view of FIG. It is a figure explaining the function of the some elliptical oblong hole opened in the cylindrical film in the Example of this invention. It is a figure explaining the structure by which the elliptical long hole of a some longitudinal direction is opened in the cylindrical film in the Example of this invention. It is sectional drawing and a perspective view which show the structure of the wound covering sheet in the Example of this invention. It is a figure explaining the sticking state of the wound covering sheet in the Example of this invention.

The present invention comprises a porous film that contacts a wound, a water absorbent sheet that absorbs exudate from the wound, and a waterproof film that prevents the exudate absorbed in the water absorbent sheet from leaking outside, the porous film, A wound covering sheet comprising a plurality of layers in the order of the water-absorbing sheet and the waterproof film, wherein the porous film is an extrusion molding in which an annular slit is provided by eluting a thermoplastic resin mixed with a foaming agent from a melting tank. The cylindrical film is formed by the means, and the cylindrical film is constructed so that the inner peripheral wall is pulled up while contacting along the outer peripheral edge of the disk laminated in a plurality of stages at a constant interval. Up to the stage, the diameter gradually increases, and the resin material of the cylindrical film is configured to be pulled up without gelation. Furthermore, an air pocket space having a triangular cross section is formed by an inclined surface as a bubble rupture means at the leading edge of the laminated disk on which the cylindrical film slides, and between the laminated disks. In the state where the synthetic resin of the film does not gel, the bubbles contained in the cylindrical film are expanded by pumping air from the air outlet of the hollow pipe that penetrates the center of each disk, and the foam breaks in the gelled state. It is characterized in that a large number of bubble breaking holes are formed in the tubular film .

  That is, the present invention relates to a wound covering sheet for protecting a wound on a human body, and particularly to use as a wound covering sheet that is optimal for protecting a wound due to bed slip.

  Hereinafter, the wound covering sheet according to the present example will be described with reference to the drawings.

  As shown in FIG. 1, the wound covering sheet 1 according to the present embodiment is formed in a single sheet of a square having a predetermined size in plan view. The porous film 2 on the back surface is formed in a square having an area that is slightly larger than the waterproof film 4 on the front surface, and covers the four sides of the waterproof film 4 on the front surface with a portion having an area larger than the waterproof film 4. It is attached to the surface. In addition, the size of the wound covering sheet 1 is prepared in a plurality of sizes according to the size of the wound on the human body. Furthermore, the shape of the wound covering sheet 1 is not limited to a quadrangle, and can be various shapes such as a circle, an ellipse, and a gourd according to the shape of the wound to be attached.

  As shown in FIG. 2, the wound covering sheet 1 has a porous film 2 disposed in the lowermost layer, which is a contact portion with the wound, and absorbs liquid such as exudate and pus from the wound on the porous film 2. A sheet 3 is disposed, and a waterproof film 4 that prevents water absorbed by the water absorbent sheet 3 from leaking to the outside is disposed above the water absorbent sheet 3, and the four sides of the waterproof film 4 on the surface are formed by the lowermost porous film 2. It has a three-layer structure that covers

  The porous film 2 is obtained by heating and melting a thermoplastic resin (polyvinyl chloride, polyethylene, polypropylene, etc.) as a raw material, and further mixing a blowing agent with the molten resin to generate bubbles, and this molten resin. In the process of forming a sheet-like film from, a sheet-like film in which a large number of fine elliptical elongated holes of different sizes and shapes are randomly opened by rupturing bubbles generated in the molten resin is suitable Used for. In addition, about the manufacturing process of the porous film 2, details are mentioned later.

  The water absorbent sheet 3 is made of a material excellent in water absorbency and oil absorbency, and for example, inexpensive kitchen paper is preferably used. The waterproof film 4 is made of a material in which moisture absorbed by the waterproof film 4 does not leak to the surface of the wound covering sheet 1, and for example, a food wrap is preferably used.

  As shown in FIG. 3 (a), the wound covering sheet 1 of the present embodiment has a medical tape T or the like applied to the wound K of the human body where the symptoms of bed slip have progressed, as shown in FIG. 3 (b). The waterproof film 4 is used on the surface, and the porous film 2 is stuck so as to contact the wound K. And according to the verification of the applicant of the present application, by periodically replacing the wound covering sheet 1, as shown in FIG. 3C, the therapeutic effect of the wound K such as bed slip can be dramatically improved. did it.

  As shown in FIG. 4, the porous film 2 according to the present example has a large number of fine vertical holes B that are randomly penetrated up and down, so that even if the wound is large, the entire surface of the porous film 2 is formed. Water such as exudate and pus from the wound can be discharged from a large number of vertically long holes B formed over the water, and can be quickly absorbed by the water absorbent sheet 3. Further, the contact surface between the porous film 2 and the wound is uneven due to the bursting of the bubbles when the vertically long hole B is opened, so that a small gap is generated on the contact surface with the wound. For this reason, the water | moisture content from a wound flows through this clearance gap, can be discharged | emitted from many vertical elongate holes B, and can be absorbed by the water absorbing sheet 3. FIG. For this reason, moisture such as exudate and pus from the wound can be absorbed to keep the wound dry. In addition, since many fine vertically long holes B are opened at random in the vertical direction, it has excellent stretchability in the width direction perpendicular to the vertically long direction, and the irritation to the dry wound is alleviated.

Et al is, as shown in FIG. 10 (b), the porous film on the inner peripheral surface of the large number of elongated holes B that was opened to 2, ruptured burst pieces after the thin film F1 is ruptured to cover the surface of the bubble A F2 remains in a state of protruding from the front and back surfaces of the porous film 2, respectively. That is, as shown in FIG. 12, the front and back surfaces of the porous film 2 have innumerable small irregularities instead of being flat and flat, and the innumerable small irregularities cause the contact surface between the porous film 2 and the wound K. A fine gap can be generated in the substrate.

Accordingly, as shown in FIG. 12, when the porous film 2 of the wound covering sheet 1 is stuck to the wound K, the wound K and the porous film are formed by the gaps formed by the unevenness formed on the contact surface between the porous film 2 and the wound K. It can prevent that a contact surface with the film 2 adheres. In addition, the rupture piece F2 remaining in a state of projecting into the vertically long hole B of the porous film 2 will function as a buffer portion when the porous film 2 comes into contact with the wound, and is further opened in the porous film 2. Many of the fine vertical holes B that are oval are excellent in elasticity due to their elliptical shape, and even when they come into contact with the dried wound K, they do not irritate the wound K and can improve the treatment effect.

  As shown in FIG. 5, the wound covering sheet 1 in the present embodiment can be provided with an attaching portion 5 for attaching the wound covering sheet 1 to the human body on the surface of the waterproof film 4. In the example shown in FIG. 5 (a), the sticking part 5 is formed in a cross shape (x mark shape) protruding from the four sides of the wound covering sheet 1 formed in a square shape. And it has the adhesion surface 5a for attaching the wound covering sheet | seat 1 to a human body in the bottom face of the part which protruded in these 4 places, respectively.

  Moreover, in the example shown in FIG.5 (b), the sticking part 5 protrudes from the square of the wound covering sheet 1 formed in the square, and is formed in the cross shape (x mark shape). And it has the adhesion surface 5a for attaching the wound covering sheet | seat 1 to a human body in the bottom face of the part which protruded in these 4 places, respectively.

  Thus, it is set as the structure which provided the sticking part 5 which has the adhesive surface 5a so that the four sides (or four corners) of the wound covering sheet 1 formed in the rectangle may be suppressed, and the wound covering sheet 1 is made into the wound. It can be applied stably, and it is possible to facilitate the application and replacement of the wound covering sheet 1 to the wound of the human body. In addition, since the adhesive film 5 is not provided on the porous film 2 in contact with the wound by providing the sticking part 5 on the surface of the waterproof film 4, exudate, pus, etc. from the wound are formed on the entire surface of the porous film 2. It is possible to absorb moisture and keep the wound dry.

  In addition, since the patient who develops bedsore etc. has many elderly people and the skin is weak, the wound covering sheet 1 is not directly applied to the skin, but the wound covering sheet 1 is wound around the wound with a bandage, for example. It may be fixed. According to the wound covering sheet 1 having the above-described configuration, it is possible to perform wound wrap treatment such as bed slip using an inexpensive material.

  Below, the manufacturing method of the porous film 2 which comprises the wound coating sheet 1 which concerns on this embodiment is demonstrated based on FIGS.

  First, a thermoplastic resin raw material selected from polystyrene, polypropylene, high-density polyethylene, etc. is heated and melted, and a foaming agent is mixed therein to generate a large number of large and small bubbles in the molten resin raw material. After the tubular film is gelled from the semi-cured state until it is formed into a tubular film, in a state in which bubbles are contained in the peripheral wall of the tubular film F, and then wound into a flat shape. The porous film 2 is formed by puncturing air bubbles in the peripheral wall of the tubular film F by the bubble bursting means to open a large number of longitudinal holes B of different sizes and shapes in irregular order on the entire peripheral wall of the tubular film F. The porous film 2 is cut and formed into a predetermined shape as a wound covering sheet 1.

  As shown in FIG. 6, a tubular film forming apparatus 100 with a hole for producing such a porous film 2 is obtained by heating and melting a thermoplastic resin raw material 41, mixing a foaming agent therein, and adding a large number of them into the molten resin raw material. The heating and melting means 40 for generating large and small bubbles, the extrusion means 46 for forming the bubble-containing resin raw material into the cylindrical film F in a state in which bubbles are contained in the peripheral wall of the cylindrical film F, and the cylindrical film F Until the cylindrical film is gelatinized from the semi-cured state until the flat film is wound up, the bubbles in the peripheral wall of the cylindrical film F are ruptured, and a large number of different sizes and shapes are formed on the entire peripheral wall of the cylindrical film F. The bubble rupturing means 47 for opening the elongated holes B in irregular order, the winding means 54 for winding the cylindrical film F into a flat shape, and the flat cylindrical film F wound up by the winding means 54 With a predetermined width A cutting portion 59 for forming a sheet-like porous film 2 and the cross-sectional, and the film accommodating portion 101 for accommodating the porous film 2 cut to a predetermined width, the constructed.

  The heating and melting means 40 includes a melting tank 42, a heater 44, and a transfer conveyor 45.

  That is, as shown in FIG. 6, the heating and melting means 40 constitutes a melting tank 42 so that a thermoplastic resin raw material 41 can be accommodated, and an inlet 43 for introducing the molten resin raw material is formed above the melting tank 42. A heating heater 44 for heating the thermoplastic resin raw material 41 accommodated in the melting tank 42 is configured, and a conveying conveyor 45 including a screw conveyor is configured in the melting tank 42.

  As shown in FIG. 7, the extrusion molding means 46 is continuously connected to the conveyance tip side of the melting tank 42, and the inner frame mold 46-1 is held by holding slits at a predetermined interval in the outer frame mold 46-2. The slit in the space between the inner frame mold 46-1 and the outer frame mold 46-2 is formed to form an annular slit 63 for extruding the thermoplastic resin material 41 melted by the melting tank 42 into a cylindrical shape upward. doing.

  In addition, the slit width of the annular slit 63 gradually decreases upward, and the end opening edge constitutes an extrusion port 62 for forming the tubular film F, and the film thickness is controlled by the width of the extrusion port 62. By adjusting. Reference numeral 62 denotes a resin passage communicating with the inside of the outer frame mold 46-2.

  The bubble rupture means 47 ruptures bubbles in the peripheral wall of the cylindrical film F formed by the extrusion means 46, and the disk 50 laminated in a plurality of stages at regular intervals and its outer peripheral edge face downward. An air pocket space 58a having a substantially triangular cross section formed by a disc tip edge 58b formed on the inclined surface and having an acute angle, an inner peripheral surface of the cylindrical film F in contact with the edge, and air between the stacked discs 50 And an air supply path O for supplying air. Moreover, as will be described later, the initial stage of extrusion molding of the tubular film F is a semi-cured resin, and then gelled to solidify the bubbles and break the bubbles by the bubble rupture means 47.

  In addition, the multi-stage disks 50 stacked at regular intervals above the annular slit 63 in the extrusion molding means 46 gradually increase in diameter from the lowest layer to the third to fourth stages, and the upper stage has the same or slightly larger diameter. It is a laminated disk.

  Furthermore, the thermoplastic resin raw material 41 that is extruded from the lowermost layer to a plurality of stages, for example, 3 to 4 stage disks, becomes a cylindrical shape with an expanded diameter, remains an uncured resin raw material, that is, does not gel. Extrusion is performed at a speed that keeps the shape as it is. Although it is in an uncured state, it is a state in which a certain sheet-like shape is maintained, and has a viscosity sufficient to be continuously pulled upward.

  The tubular film F extruded in this uncured ungelled state contains bubbles, but since the resin raw material has a viscosity in a semi-molten state, the cell peripheral wall in the semi-cured state Elongates and the contained bubbles also elongate in the longitudinal direction. However, in this state, the bubbles have not broken.

  Then, when it is pushed out from the annular slit 63 and goes up from the third to fourth stages of the disk in 0.5 to 1.8 seconds, the resin raw material gradually gelates from the uncured state, and the bubbles are solidified on the gelled bubble peripheral wall. The bubbles are completely broken by the bubble rupture means 47, and a large number of holes are formed on the peripheral wall of the tubular film F due to the broken bubbles.

  Thus, the cylindrical film F formed by the extrusion molding means 46 and pulled up along the outer peripheral edge of the laminated disk is a resin raw material from the lower layer disk to the disk 3 to 4 steps above. Moves upward in an uncured state, gradually becomes a gelled state and is pulled up. This makes it possible to understand the following situation.

(1) If the distance pulled up in the uncured state from the lowermost disk is increased (if the number of stacked disks increases), then the included bubbles are pulled vertically and gradually gelled and ruptured. Large bubbles that are elongated vertically are formed.

  In other words, it is possible to adjust the size of the vertically elongated holes of the ruptured bubbles by adjusting the distance and time for pulling the uncured resin raw material, the number of laminated disks guided in the uncured state, and the like. For example, in this embodiment, the time until the uncured resin raw material is gelled (solidified to such an extent that bubbles can be broken) is 0.5 to 1.8 seconds.

(2) Since the uncured resin raw material gradually gels with the passage of time when pulling up the tubular film F, it is possible to adjust the size of the vertically elongated holes of the bursting bubbles by adjusting the pulling speed. it can. For example, in this embodiment, the pulling-up (winding) speed of the tubular film F is 10 to 25 m / min.

(3) Longitudinal formation of bubbles formed by pulling the uncured resin raw material upwards (vertically long elliptical holes) is formed on the left and right edges of the rupture folds when ruptured in a gelled state. Rupture folds but flutters vertically. As a result, the surface of the hole in many cylindrical films does not interfere with the folds on the left and right edges of the film in the traveling direction, and it is easy to slide. It becomes a projecting piece and interferes with skidding, making it difficult to slip. Therefore, when it is used as the wound covering sheet 1, it is easy to handle the wound from above.

(4) When the tubular film F is pulled up, it is pulled up along the outer peripheral edge of the disk, but since the tubular film is uncured from the lowermost layer to several stages of disks, it is expanded by air pressure. It is enormous and there is almost no contact with the outer periphery of the disk, and there is no disk resistance for pulling up the cylindrical film. However, the hardened film is easily pulled up by being easily slid between the inner surface of the cylindrical film which has been gelated and hardened as it is displaced upward and the outer periphery of the disk.

  That is, as shown in FIG. 8 (a), the disk 50 is laminated in a plurality of stages at regular intervals, and the diameter of the disk 50 arranged at the lowermost part is the smallest, and the third stage from the lowest stage to a predetermined diameter. Up to this point, the diameter is increased stepwise, and from the fourth stage, the diameter is the same and a plurality of stages are stacked.

  Further, as shown in FIG. 8A, the outer peripheral edge of the disk 50 forms a disk tip edge 58b formed at an acute angle by an inclined surface directed downward.

  Further, the hollow pipe 51 that supports the stacked discs 50 at the center forms an air supply path O for sending air into the interior, and compressed air is supplied from the air supply means 60 of the compressor through the air supply pipe 61. Air. A plurality of air outlets 57 are provided on the outer peripheral wall of the hollow pipe 51 to send air between the stacked disks.

  The winding means 54 is disposed above the laminated disk including the bubble rupturing means 47, and includes a flat means 52 composed of two elastic guide wires 52a and 52a, a pair of pinch rollers 53 and 53, and a guide roller. 55, 55 and a winding device (not shown).

  The method and apparatus for producing the porous film 2 as the wound covering sheet 1 using the perforated tubular film forming apparatus 100 are as described above.

  As shown in FIG. 6, the tubular film F is folded into a flat shape while being guided along the outer sides of the two left and right elastic guide lines 52a and 52a.

  The cylindrical film F that has been flattened by the flat means 52 is wound up by a pair of pinch rollers 53, 53 constituting the winding means 54, and then passed through a plurality of guide rollers 55 to the cutting portion 59. The sheet is conveyed and cut into a sheet having a predetermined width by the cutting unit 59. The tubular film F cut to a predetermined width is accommodated as a sheet-like porous film 2 on the film accommodating portion 101.

  Here, referring to FIGS. 6 to 8, bubbles in the peripheral wall of the tubular film F are broken by the bubble rupture means 47, and a large number of vertically long holes B having different sizes and shapes are formed on the entire peripheral wall of the tubular film F. Will be described.

  As shown in FIG. 6, the tubular film F stretched to a predetermined thickness is wound upward by the winding means 54 while being in contact with the disk leading edges 58 b of the plurality of disks 50.

  A disc tip edge 58b is formed at the outer peripheral end of the disc 50 with an acute inclined surface facing downward, and an upper end acute angle portion 58c is formed at the disc tip edge 58b of the disc 50. The inner peripheral surface of the tubular film F contacts the acute angle portion 58c.

  When air is supplied between the plurality of air outlets 57 provided on the outer peripheral wall of the hollow pipe 51 through the air supply path O, the front end edge 58b of the disk 50 and the inner periphery of the tubular film F are supplied. An air reservoir space 58a having a substantially triangular cross section is formed between the surface and the surface.

  And at the initial stage of extrusion molding of the tubular film F, as described above, the resin is in an uncured state and thus has viscosity, and does not break even if the bubbles are expanded by air pressure. However, when gelled, the bubbles contained in the resin are solidified and broken to form bubble breakage holes in the thin film.

  That is, the compressed air blown inward of the tubular film F is pumped from the lower opening of the air reservoir space 58a toward the upper narrowed portion of the air reservoir space 58a, and is gelled by the pressure sending force. Of the inner peripheral surface of the cylindrical film F, the inner peripheral surface of the cylindrical film F located in the air reservoir space 58a around the periphery of the disk 50 is greatly bulged to promote bubble breakage.

  In addition, the said disc front-end | tip edge 58b is not restricted to the shape of Fig.8 (a), As shown in FIG.8 (b), the inclined surface toward the downward direction can also be comprised in curved shape.

  Also, by heating the air blown into the tubular film F from the air outlet 57, it becomes heated and expanded air, and the inner peripheral surface of the tubular film F is pressed more strongly in the air reservoir space 58 and ruptured. It can also be configured to.

  Further, the opening diameter of the air outlet 57 is set to a diameter at which a blowing sound is generated by the pressure-fed and supplied air.

  By adopting such a configuration, it is possible to generate a standing wave by reverberating the blowing sound in the space formed between the disks 50, and to promote bubble breaking by the sound pressure of the standing wave.

  In this way, as shown in FIG. 9 (a), the longitudinally oblong air bubbles A having a width L1 at the center portion sealed in the tubular film F are formed from the inside of the tubular film F. As shown in FIG. 9B, the central portion is pushed and expanded in the lateral direction from the width L1 to the width L2 by the pressing bias by the air pressure.

  Then, the thin film on the surface covering the bubble A is ruptured by the contact between the inner peripheral surface of the cylindrical film F and the acute upper end 58c of the outer peripheral upper end edge of the disk 50 and the air pressure of the air retaining space 58a. A large number of elliptical long holes B having different sizes and shapes in the vertical direction of the tubular film F are irregularly opened at different positions.

  As shown in FIG. 10A, the surface of the air bubble A enclosed in the resin of the tubular film F is covered with a thin thin film F1, and as described above, the air pressure in the air reservoir space 58a is pressed. The thin film F1 on the surface of the bubble A is ruptured, and as shown in FIG. 10B, an elliptical oblong hole B that is long in the longitudinal direction of the tubular film F is opened.

  Further, as shown in FIG. 10B, on the inner peripheral end surface of the vertically long hole B formed in the tubular film F, a rupture piece F2 due to bubble breakage of the thin film F1 covering the surface of the ruptured bubble A, so-called rupture. The folds remain side by side along the outer periphery of the bubble break.

  Thus, the bubble rupturing means 47 can open a large number of vertically long holes B on the entire peripheral wall of the tubular film F in different sizes and shapes.

  Even in this case, since the plurality of vertically long holes B formed in the tubular film F are elongated in the uncured resin, the longitudinal direction is coupled with the state of being wound up by the winding means 54. It is formed in an oval shape. Furthermore, when the compressed air is blown into the tubular film F from the air outlet 57, the thermoplastic resin raw material 41 as the raw material of the tubular film F is cooled, and as shown in FIG. The vertically long holes B are gelled in an elliptical shape that is long in the vertical direction.

  In this way, the porous film 2 can be obtained, and this porous film 2 is used as the wound covering sheet 1.

  The sheet-like porous film 2 manufactured in the above-described process and accommodated on the film accommodating portion 101 has a cylindrical shape having openings on the upper and lower sides when expanded. For this reason, the outer peripheral surface of the cylindrical porous film 2 is cut | disconnected perpendicularly | vertically, it expand | deploys to the porous film 2 of this sheet | seat, The wound covering sheet | seat 1 (in this Example) using this sheet-like porous film 2 ( (See FIG. 1).

  However, the wound covering sheet 1 can also be configured using the cylindrical porous film 2 as it is. That is, as shown in FIG. 11, the water absorbent sheet 3 and the waterproof film 4 are inserted into the cylindrical porous film 2 having openings on the upper and lower sides, and the upper and lower porous films 2, the water absorbent sheet 3 and the waterproof film are inserted. The wound covering sheet 1 is configured by closely bonding 4 and bonding the upper and lower openings with a heat seal or the like and packaging. The wound covering sheet 1 in this case has a four-layer structure in which the water absorbing sheet 3 and the waterproof film 4 are sandwiched between the upper and lower porous films 2. By using the wound covering sheet 1 having such a configuration, it is possible to easily produce a plurality of types of wound covering sheets 1 having different sizes in the vertical direction only by changing a predetermined width cut by the cutting portion 59. It becomes possible.

  As mentioned above, although this invention has been demonstrated through the present Example, this invention is not limited to these. Moreover, each effect mentioned above only enumerated the most suitable effect which arises from this invention, and the effect by this invention is not limited to what was described in the present Example.

1: wound covering sheet 2: porous film 3: water-absorbing sheet 4: waterproof film 5: sticking part

Claims (2)

A porous film in contact with the wound;
A water absorbent sheet for absorbing exudate from the wound,
A waterproof film that prevents the exudate absorbed in the water absorbent sheet from leaking to the outside, and
A method for producing a wound covering sheet comprising a plurality of layers in the order of the porous film, the water absorbing sheet, and the waterproof film,
The porous film elutes a thermoplastic resin mixed with a foaming agent from a melting tank to form a cylindrical film by an extrusion molding means provided with an annular slit, and the cylindrical film has a plurality of steps with an inner peripheral wall at regular intervals. It is constructed so that it can be pulled up while contacting along the outer peripheral edge of the laminated disk, and the diameter is gradually increased up to the third to fourth stages of the laminated disk, and the resin material of the tubular film is pulled up without gelation. The upper part is a laminated disk of the same diameter so that the resin raw material is gelled and pulled up.Furthermore, on the front edge of the laminated disk on which the cylindrical film slides, the bubble rupture means A cylindrical film is formed by forming an air reservoir space having a triangular cross-section with an inclined surface and pumping air from the air outlet of a hollow pipe that passes through the center of each disk between the stacked disks. Is extension was contained bubbles in a state where the synthetic resin does not gel the film, it is in a state of gelation of wound cover sheet, characterized by being configured to form a large number of Yabuawaana the tubular film by foam breaking Manufacturing method . The method for producing a wound-covering sheet according to claim 1, wherein a sticking portion for sticking to a wound is formed on the upper surface of the waterproof film in a cross shape.

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