JP6076883B2 - Manufacturing method of composite mesh sheet - Google Patents

Description

  The present invention relates to a method for manufacturing a composite mesh sheet obtained by combining a mesh sheet in a resin sheet in an embedded state.

  Conventionally, a method of combining a mesh sheet with a resin sheet is known as a reinforcing measure for the resin sheet. These composites are generally made by laminating a mesh sheet and a resin layer by resin lamination or melt extrusion.

  As shown in the following Patent Document 1, a resin laminating process is usually performed by interposing a laminating resin layer as a sand resin between a sheet base material and a mesh cloth (corresponding to the above mesh sheet) and press-contacting them. A laminated sheet, or a mesh cloth is overlaid on the sheet base material, and a laminating resin is coated from the upper surface of the mesh cloth, and the laminate resin and the sheet base material are passed through the cross gap portion. It is performed by a method of bonding to form a laminated sheet.

  In the laminated sheet reinforced by combining the mesh cloth in this way, the mesh cloth and the laminating resin layer are integrated, but the former method is an intersection part in the structure of the flat yarn constituting the mesh cloth. As a result, a thick portion such as swells rises and the like, resulting in unevenness in the laminate, which tends to be inferior in surface smoothness. In the latter method, since the mesh cloth is located in the middle of the laminated sheet, the contact surface between the sheet base material and the flat yarn becomes non-adhered, and the laminated body has poor bonding strength and is easily peeled off. May become a problem.

  On the other hand, a mesh sheet may be combined to reinforce a resin film made of a resin unsuitable for melt extrusion. In that case, it is conceivable to take a method of once forming a resin film and then laminating a mesh sheet. However, in this method, it is difficult to combine the mesh sheet in the resin sheet in an embedded state, and the number of processes is increased.

  As another method, a solution in which a resin unsuitable for melt extrusion is dissolved in a solvent is extruded from a slit die and laminated on a mesh sheet. However, in that case, an apparatus for processing becomes large, and there is a problem of gelation at the time of storage of the solution, which is unsuitable for high-mix low-volume production. Furthermore, the air brought in by the mesh sheet cannot be prevented from remaining as bubbles in the product.

  As a measure against this, a method is conceivable in which a solution of the resin is poured onto the mesh sheet, and then the solvent is dried to obtain a composite mesh sheet in which the mesh sheet is composited in the resin sheet. However, in this method, since the mesh sheet floats when the resin solution flows down on the mesh sheet, it is necessary to hold the mesh sheet, which requires complicated jigs and other operations. There is a problem. Further, there is a problem that bubbles are mixed in the process of operation and remain in the product. Furthermore, the air held in the mesh sheet cannot be prevented from remaining as bubbles in the product.

Japanese Patent Laid-Open No. 08-090695

  An object of the present invention is to provide a method for producing a composite mesh sheet that is suitable for high-mix low-volume production, is easy to operate, and has few bubbles remaining in the sheet.

The gist of the method for producing a composite mesh sheet according to the present invention is as follows:
Preparing a tank, a resin-containing liquid, a mesh sheet, and a squeegee plate;
Putting the resin-containing liquid into the tank;
Spreading the mesh sheet in the liquid surface direction of the resin-containing liquid and placing it on the liquid surface;
Moving the squeegee plate and the tank relative to each other while bringing the tip of the squeegee plate into contact with the mesh sheet, and sinking the mesh sheet in the resin-containing liquid;
Drying the resin-containing liquid in which the mesh sheet is submerged,
It is to include.

  The resin-containing liquid may be a water-soluble resin solution or dispersion.

  The resin-containing liquid may be a liquid containing a gelling polymer compound.

  After the resin-containing liquid is gelled, it can be dried.

  The mesh sheet may be a knitted fabric mainly composed of thermoplastic fibers, and may be fixed by heat for a fixed length after knitting.

  The mesh sheet may be fixed and heat-fixed at a constant length without the peripheral edge being heated and pressed and the inner side of the peripheral edge being pressed.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the composite mesh sheet | seat suitable for multi-product small-quantity production, easy operation, and few bubbles remain | survived in a sheet | seat is provided.

Explanatory drawing explaining operation | movement in the manufacturing method of the composite mesh sheet of this invention later on. Explanatory drawing explaining operation of the squeegee board in the manufacturing method of the composite mesh sheet | seat of this invention. The top view which shows the structure of the mesh sheet | seat used for the manufacturing method of the composite mesh sheet | seat of this invention. Sectional drawing which shows the preferable shape of the front-end | tip part of the squeegee board used for the manufacturing method of the composite mesh sheet | seat of this invention. Explanatory drawing of other embodiment about operation of the squeegee board in the manufacturing method of the composite mesh sheet | seat of this invention. The perspective view which shows the tank which concerns on other embodiment used for the manufacturing method of the composite mesh sheet | seat of this invention. The schematic plan view which shows the preferable squeegee direction in relation to the shape of the mesh opening of a mesh sheet.

  In order to facilitate understanding of the present invention, some terms herein are defined below.

Mesh sheet: A breathable cloth obtained by processing yarn or fiber into a sheet.
Resin-containing liquid: A solution in which a resin is dissolved in a solvent or a dispersion in which a resin is dispersed in a liquid.
Composite mesh sheet: A sheet in which a mesh sheet is combined with a resin sheet in an embedded state.
Squeegee: The movement of the plate in the liquid surface direction so as to push the liquid in a state where the tip of the plate is pushed into the liquid.

  The manufacturing method of the composite mesh sheet of this invention is demonstrated using figures. First, the tank 2, the resin-containing liquid 4, the mesh sheet 8, and the squeegee plate 10 are prepared as advance preparations for performing the operation shown in FIG.

  Subsequently, as shown in FIG. 1 (a), a resin-containing liquid 4 (hereinafter referred to as “liquid 4”) is placed in the tank 2 and left there. The method for putting the liquid 4 in the tank 2 is not particularly limited. For example, supply means (not shown) such as a pump may be used, or an artificial supply method may be employed. The tank 2 has a vertical width and a horizontal width according to the size of the composite mesh sheet to be obtained. Usually, the vertical width and the horizontal width are about 10 to 50 cm, but are not limited to this range. The depth of the tank 2 should just be more than the depth which can hold | maintain the liquid 4 predetermined amount. Preferably it is 2-5 cm. The tank 2 is usually of a flat bottom, but the bottom surface may have an uneven surface or a three-dimensionally curved surface.

  A fixing means 16 for fixing one side 11 (FIG. 1B) of the mesh sheet 8 is provided on one bottom 15 of the inner bottom surface 6 of the tank 2.

  Next, as shown in FIG. 1 (b), the mesh sheet 8 spread in the direction of the liquid surface 5 is placed so as to be laminated on the liquid surface 5 of the liquid 4 put in the tank 2. After the mesh sheet 8 is placed on the liquid surface 5, the mesh sheet 8 is in an unrestrained state. At this time, depending on the wettability of the mesh sheet 8 to the liquid 4 and the specific gravity difference between the mesh sheet 8 and the liquid 4, in most cases, a part of the mesh sheet 8 is settled in the liquid 4. The meaning of the operation of placing the mesh sheet 8 on the liquid surface 5 includes a case where at least a part of the mesh sheet 8 enters the liquid 4 during the operation. Furthermore, the case where the mesh sheet 8 is dropped on the liquid surface 5 is also included.

  Next, as shown in FIG. 1C, the squeegee plate side portion 12 located at the tip of the squeegee plate 10 is made to enter the liquid 4 from above the liquid 4 toward the one side portion 11 of the mesh sheet 8. . If the mesh sheet 8 is rectangular, the squeegee plate side 12 is made to enter the liquid 4 such that the longitudinal direction thereof is substantially parallel to the longitudinal direction of the one side 11 of the mesh sheet 8. At this time, it is preferable to fix the one side portion 11 of the mesh sheet 8 by holding the fixing means 16 and the jig 18 attached to the fixing means 16. However, the movement of the squeegee plate 10 in FIG. When the mesh sheet 8 does not move much in the lateral direction due to the squeegee operation, the fixing means 16 and the jig 18 can be omitted. In that case, it is only necessary to push one side 11 of the mesh sheet 8 into the liquid 4 at the tip of the squeegee plate 10. The shape of the mesh sheet 8 is not particularly limited. For example, the one side or the other side facing the one side is not limited to a straight line, and may be a bent line, a curved line, or a wavy line.

  The material of the squeegee plate 10 may be resin (engineering plastic, rubber, etc.), ceramics, metal, or a heater is provided so that the squeegee plate 10 can be heated, and the temperature of the squeegee plate 10 is controlled by a controller or the like. Good. The shape of the squeegee plate 10 may be a rod shape having substantially the same cross-sectional aspect ratio, or may be a knife-like thin plate shape.

  Next, as shown in FIG. 1 (d), the contact portion of the mesh sheet 8 with the squeegee plate 10 is in a state where the tip portion of the squeegee plate 10 is pressed into the liquid 4 while being in contact with the mesh sheet 8. The squeegee plate 10 is moved toward the other side 13 in the direction of the liquid level 5 so as to move toward the other side 13 of the eight. The other side 13 is a side of the mesh sheet 8 that faces the one side 11. However, in relation to the shape of the mesh sheet 8, the direction in which the squeegee plate 10 is moved (that is, the direction of the squeegee) is not particularly limited. For example, in the case of the rectangular mesh sheet 8 as in the present embodiment, the squeegee plate 10 may be moved along the longitudinal direction thereof, or the squeegee plate 10 may be moved along the lateral direction. Or you may comprise so that the squeegee board 10 may be moved to the direction which cross | intersects a longitudinal direction and a transversal direction. Note that the squeegee may be squeezed in a state where the angle between the squeegee surface of the squeegee plate 10 and the liquid surface 5 is an acute angle. In this movement process, the distance between the squeegee plate side 12 and the liquid surface 5 may be kept substantially constant, and the mesh sheet 8 is pushed deeply or shallowly by the squeegee plate side 12. May be.

  The mesh sheet 8 is pushed into the liquid 4 by the movement of the squeegee plate 10, and the mesh sheet 8 is buried in the liquid 4 as shown in FIG. Further, since the mesh sheet 8 is submerged in the liquid 4 with almost no air bubbles remaining due to the movement of the squeegee plate 10, the air bubbles remaining in the gaps between the fibers of the mesh sheet 8 buried in the liquid 4 and the mesh sheet The state in which the mesh sheet 8 is immersed in the liquid 4 in a state where there are almost no bubbles remaining between the liquid 8 and the liquid 4 or bubbles attached to the surface of the mesh sheet 8 is realized. In addition, until each step shown to Fig.1 (a)-FIG.1 (e) is completed, it is more preferable to perform temperature / humidity management so that the liquid 4 in the tank 2 may not gelatinize or solidify at least. For example, when the liquid 4 contains a resin having a relatively low temperature at which gelation starts, the tank 2 may be heated to maintain the liquid 4 in a liquid state.

  Then, the jig | tool 18 is open | released, and the composite mesh sheet | seat is obtained by heat-drying the liquid 4 in the tank 2 in the state by which the mesh sheet 8 was embed | buried in the liquid 4 detained in the tank 2. FIG. . Drying may be drying without heating or drying under reduced pressure. For example, as shown in FIG.1 (f), a composite mesh sheet | seat is obtained also by putting the tank 2 into the heat dryer 14 and heat-drying.

  In this way, a composite mesh sheet with no bubbles remaining inside is obtained. In addition, this method is a batch type, and the sheet production speed is smaller than that of the continuous method using a slit die, but the production equipment is not large compared to the continuous method, the production conditions can be easily changed, and the product type can be changed. It is easy and the manufacturing operation is also simple. Furthermore, since each operation is simple and the structure of the apparatus used is not complicated, each operation can be easily automated. For example, the movement of the squeegee plate 10 into the liquid 4 and the backward movement from the liquid 4 and the movement from the one side 11 to the other side 13 are performed using a combination of a plurality of linear actuators or XY axis drive actuators. Sequence control can be performed.

  In the present invention, depending on the material, fiber diameter, and sheet size of the mesh sheet 8, before placing the mesh sheet 8 on the liquid surface 5, it is immersed in a treatment liquid having the same or similar components as the liquid 4 in advance. In some cases, the generation of the above-mentioned bubbles may be further reduced by wetting the fiber surface of the mesh sheet 8 with a treatment liquid having the same treatment liquid as the liquid 4 or a treatment liquid having components close thereto.

  The fixing means 16 for fixing one side 11 of the mesh sheet 8 is a fixing means for fixing the one side 11 of the mesh sheet 8 so as to be detachable. The one side 11 is clamped with a jig 18 or fixed by piercing a pin. , Etc. are performed. As described above, when the movement of the squeegee plate 10 is slow or the frictional force between the squeegee plate 10 and the mesh sheet 8 is small, the fixing means 16 can be omitted.

  In the composite mesh sheet manufacturing method of the present invention, when the squeegee plate 10 is lifted from the liquid 4 when the movement of the squeegee plate 10 is completed, the other side 13 of the mesh sheet 8 is pulled up together with the squeegee plate 10. Trouble may occur. As a method of coping with this trouble, for example, it is effective to operate the squeegee plate 10 as shown in FIG. That is, as shown in FIG. 2A, when the movement of the squeegee plate 10 is completed, the squeegee plate 10 is moved in the direction indicated by the arrow A so that the angle α between the squeegee plate 10 and the liquid level 5 is 90 degrees or less. As shown in FIG. 2 (b), the squeegee plate 10 is pulled up to above the liquid level 5 in the direction of arrow B from the rotated state as shown in FIG. As shown in FIG. 2 (c), the squeegee plate 10 is detached from the liquid 4. In the case of this pulling up, it may be pulled up substantially perpendicular to the liquid level 5 as indicated by an arrow B, or may be pulled up obliquely with respect to the liquid level 5. The rotation direction of the squeegee plate 10 may be a clockwise direction as viewed in the drawing.

  The resin used in the present invention is not particularly limited as long as it is a resin soluble in a solvent. In view of handling of the solvent, a water-soluble resin is preferable.

  The viscosity of the liquid 4 is preferably 1 to 100 cP in order not to leave bubbles in the resin of the composite mesh sheet. More preferably, it is 1-30 cP.

  The moving speed of the squeegee plate 10 with respect to the tank 2, that is, the speed of the squeegee is preferably 10 to 100 mm / sec for stabilizing the process.

  In FIG. 1A, the depth h of the liquid 4 put in the tank 2 is determined by the target weight of the composite mesh sheet to be obtained, but is preferably 2 to 10 mm. 2.5 to 5 mm is more preferable in terms of process stabilization.

  Although the density | concentration of resin in the liquid 4 put into the tank 2 is also adjusted with the target weight of the obtained composite mesh sheet and the set viscosity of the liquid 4, it is 3 to 10% by weight as a guide.

  In FIG. 1C, the distance from the tip of the squeegee plate 10 to the inner bottom surface 6 at the squeegee plate side portion 12 of the squeegee plate 10 that has entered the liquid 4, that is, between the squeegee plate 10 and the inner bottom surface 6. The width d of the gap is preferably 1 to 2 mm.

  As the mesh sheet used in the present invention, a mesh knitted fabric, a mesh woven fabric, a perforated nonwoven fabric, or the like can be used. The material of the mesh sheet is not particularly limited as long as it is a resin that can be fiberized. Natural fibers may be used. In addition, when performing the fixed length heat fixing mentioned later with respect to a mesh sheet, it is desirable that the raw material of a mesh sheet is a thermoplastic fiber. The thermoplastic fiber is a fiber made of a material that softens when heat is applied, and is more preferably made of a material having bioabsorbability. Further, as the type of the knitted fabric, a tricot knitted fabric is preferable from the viewpoint that the structure is stable without causing misalignment.

  The mesh sheet preferably has an opening of 2 to 10 mm. The apparent thickness of the mesh sheet is preferably 50 to 100 μm.

  The composite mesh sheet obtained by the method for producing a composite mesh sheet of the present invention can be suitably used as a biocompatible sheet for medical use such as a bioabsorbable sheet by selecting a material. In this case, the resin of the liquid 4 is desirably a natural polymer. Examples of such natural polymers include collagen, gelatin, hyaluronic acid, alginic acid, chitin, and chitosan. Among these, it is preferable to use gelatin that can be easily dissolved in water and has excellent processability.

  When the composite mesh sheet of the present invention is used as a biocompatible sheet for medical use such as a bioabsorbable sheet, as the material of the fibers constituting the mesh sheet 8, polylactide (PLA), polyglycolide (PGA), glycolide- Lactide copolymer, lactide-ε caprolactone copolymer, polydioxanone, glycolide-trimethylene carbonate copolymer, poly-3-hydroxybutyric acid (PHB), 3-hydroxybutyric acid-3-hydroxyvaleric acid copolymer (PHBV) , Polybutylene succinate (PBS), poly (epsilon) caprolactone (PLC), cellulose acetate (PH) polymer, polyethylene succinate (PESu), polyester amide and the like.

  The fineness of the fibers constituting the mesh sheet 8 is preferably 1 to 20 tex. The thickness (linear density) of the yarn constituting the mesh sheet 8 is preferably 1/20 g / m to 1/100 g / m.

  When a knitted fabric such as a tricot knitted fabric made of thermoplastic fibers is used as the mesh sheet 8, it is preferable that the knitted fabric is heat-fixed at a constant length. A knitted fabric in which the shape is fixed in a flat shape without undulation is obtained by fixed length heat fixation, and a flat sheet without undulation is obtained as a composite mesh sheet.

  Constant length heat fixation refers to heat-fixing the sheet by heating the sheet while restraining the sides of the sheet to be in a constant distance between the opposite sides. The distance LL between the restrained sides may be the same as the distance Lf between the sides before the heat setting before restraining (free state). LL> Lf may be sufficient. LL <Lf may be sufficient.

  The constant-length heat-fixing temperature is preferably at least the glass transition temperature of the mesh sheet 8 and less than the melting point.

  As a method of fixed length heat fixing, it is possible to heat the mesh sheet in a state where it is flat pressed, but in the mesh sheet heat fixed by the flat press in this way, the intersecting part of the yarn is crushed. In this part, bubbles are difficult to escape. On the other hand, when the heat setting process is performed by restraining only the sides of the mesh sheet, the yarn crossing portion is not crushed even after the heat setting treatment, and the yarn loop is formed at the yarn crossing portion. Since it is maintained, there is a gap between the yarns, and air bubbles can escape from this gap when squeegeeing. For this reason, bubbles remaining in the composite mesh sheet can be reduced.

  In view of this point, when the hot pressing is performed in a state where only the side (peripheral part) of the mesh sheet 8a is pressurized as shown in FIG. 3 using a flat press machine, the peripheral part 20 is pressed and the peripheral part 20 is pressed. The inner side 22 of the heat treatment is heat-fixed without being pressurized. Furthermore, such a mesh sheet 8a has a peripheral portion 20 that is more rigid than the inner side 22 of the peripheral portion 20, and has good shape stability. Further, since the peripheral portion is fixed by being rigid, the crossing portion of the stitch structure of the inner side 22 becomes difficult to move, so that there is an effect that the shape stability of the inner side 22 is also increased. Therefore, the mesh sheet 8a is easy to handle, and can be suitably used in carrying out the method for producing a composite mesh sheet of the present invention.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, in FIG. 1A, when the liquid 4 is put into the tank 2, the resin and its solvent may be mixed in the tank 2.

  In the above embodiment, the squeegee plate 10 enters the liquid 4 (FIG. 1C) or retreats from the liquid 4 (FIG. 2C), and the squeegee plate 10 moves from one side 11 to the other. All the operations related to the movement to the side portion 13 (FIG. 1D) are configured to move the squeegee plate 10, but these movements of the squeegee plate 10 are relative movements to the tank 2. May be. That is, regarding the operation of the squeegee plate 10 entering the liquid 4 and the backward movement from the liquid 4, the operation relating to the movement from one side 11 to the other side 13 of the squeegee plate 10 so as to raise and lower the tank 2. Can be configured to move the tank 2 in the horizontal direction.

  Furthermore, as shown in FIG. 4, the cross-sectional shape of the tip of the squeegee plate 10 may be a chamfered shape (FIG. 4 (a)) or an R shape (FIG. 4 (b)) chamfered into a tapered shape. desirable. Thereby, the contact area with the mesh sheet 8 is reduced, and troubles that may occur when the squeegee plate 10 is pulled up from the liquid 4 without depending on the angle adjustment operation of the squeegee plate 10 with respect to the liquid surface 5 as shown in FIG. The advantage that can be avoided is obtained. In this regard, if the cross-sectional shape of the tip portion of the squeegee plate 10 is an R shape, the contact portion with the mesh sheet 8 at the tip portion is always maintained in a state close to point contact, and the contact area can be minimized. More desirable in terms.

  Further, in the above embodiment, as shown in FIG. 1C, the squeegee plate 10 is made to enter the liquid 4 by pushing one side 11 of the mesh sheet 8 into the liquid 4. The relative positional relationship between the squeegee plate 10 and the mesh sheet 8 when the squeegee plate 10 enters the liquid 4 is not particularly limited.

  For example, as shown in FIG. 5, the entry position of the squeegee plate 10 into the liquid 4 may be a position (FIG. 5A) that is disengaged from the mesh sheet 8, or the center of the mesh sheet 8 is pushed in. Such a position (FIG. 5B) may be used. Or you may make the squeegee board 10 approach to arbitrary positions other than this. At that time, according to the relative positional relationship between the squeegee plate 10 and the mesh sheet 8 at the time of entering the liquid 4, the contact portion of the mesh sheet 8 with the squeegee plate 10 is changed from, for example, one side 11 side to the other side. You may comprise so that squeegee operation to reciprocate to the part 13 side or the reverse direction may be performed.

  Further, the squeegee operation for sinking the mesh sheet 8 in the liquid 4 can be performed using a plurality of squeegee plates 10. For example, as shown in FIG. 5 (b), after a plurality of squeegee plates 10 have entered the liquid 4 so as to push the center of the mesh sheet 8 into the liquid 4, It is also possible to employ a configuration in which each squeegee plate 10 and the tank 2 are relatively moved so that the contact portions move away from each other. Thus, in the present invention, as long as the mesh sheet 8 can be submerged in the liquid 4 with almost no bubbles attached, the squeegee operation start position, the number of squeegee operations, and the squeegee plate 10 used for the squeegee are used. The number is unquestioned.

  In addition, the tank 2 for containing the liquid 4 does not necessarily have to be an integral type, and may be capable of appropriately separating a plurality of constituent members. For example, like the tank 2 ′ shown in FIG. 6, one having a bottom plate member 2 a and a frame member 2 b placed on the main surface of the bottom plate member 2 a may be used. For example, a projection (not shown) for positioning the frame member 2b may be provided on the main surface of the bottom plate member 2a. Moreover, the frame member 2b may be comprised so that the rod-shaped member which comprises each side part can be isolate | separated further, and what was connected integrally may be sufficient as it. Furthermore, in the case where the liquid 4 to be introduced into the tank 2 ′ is a liquid containing a gelling polymer compound such as gelatin, in order to prevent the liquid 4 from gelling immediately after being introduced into the tank 2 ′, You may make it adjust the temperature of tank 2 'with heating means, such as a heater.

  When the liquid 4 is a liquid containing a gelling polymer compound such as gelatin, the above steps (FIGS. 1 (a) to (e)) are performed using the tank 2 ′, and the mesh sheet 8 After the liquid 4 in which the water is submerged is gelled, it may be dried in a state where the frame member 2b and the bottom plate member 2a are separated. Examples of the method of gelling the liquid 4 include a method of cooling the liquid 4 (including natural cooling by standing), adding a gelling agent to the liquid 4, or giving vibration to the liquid 4. . Examples of the gelation method by cooling include a method of forcibly cooling using a cooling device such as a Peltier cooler. Specifically, the bottom plate member 2a may be placed on a plate to which a cooling device is attached and forcedly cooled from below, or the cooling device may be directly attached to the bottom plate member 2a itself. Alternatively, it is possible to cool the bottom plate member 2a by automatically or manually transferring it to a cooling space such as a refrigerator. These methods are appropriately selected according to the type of gelling polymer compound contained in the liquid 4 and its gelling properties, the content of the gelling polymer compound in the liquid 4, and the like.

  If the tank 2 ′ is used in the method for producing a composite mesh sheet according to the present invention, the bottom plate member 2 a and the frame member 2 b can be separated and used simultaneously in different steps. Thereby, the production efficiency of the composite mesh sheet can be further increased while greatly reducing the number of frame members 2b with respect to the bottom plate member 2a. Further, there is an advantage that the tank 2 'after use can be easily cleaned.

  In the method for producing a composite mesh sheet according to the present invention, the relationship between the shape of the mesh sheet 8 and the direction of the squeegee (that is, the direction in which the squeegee plate 10 and the tank 2 are relatively moved in the horizontal direction). Although there is no particular limitation, the squeegee is preferably squeezed in the following direction in order to further reduce the adhesion of bubbles in the vicinity of the openings (engagement of bubbles by the squeegee). That is, as shown in FIG. 7, when the mesh sheet 8 has a square shape (FIG. 7A) or a diamond shape (FIG. 7B), the mesh shape is changed to the shape of the mesh. It is desirable to squeeze in a direction that intersects each defined side (for example, a direction along a diagonal line).

  However, the direction of the squeegee does not necessarily need to be non-parallel to all the sides that define the shape of the mesh sheet 8. For example, as in the mesh sheet 8 shown in FIG. 3, when the number of sides defining the shape of the opening is relatively large, such as a polygonal shape such as a hexagon, the direction parallel to a certain side There is no particular problem with squeegeeing. Further, when the mesh sheet 8 has a square or rhombus shape, the mesh sheet 8 may be squeezed in a direction parallel to a certain side.

  The method for producing a composite mesh sheet of the present invention can be suitably used as a method for producing a biocompatible sheet for medical use such as a bioabsorbable sheet. In particular, it is useful as a method for producing a composite mesh sheet used for the purpose of exhibiting hemostasis, air leakage prevention, tissue regeneration ability, and adhesion prevention effects in wounds of living tissues in surgical operations.

2: Tank 4: Resin-containing liquid 6: Inner bottom surface 8, 8a: Mesh sheet 10: Squeegee plate 14: Heating dryer

Claims (6)

Preparing a tank, a resin-containing liquid, a mesh sheet, and a squeegee plate;
Putting the resin-containing liquid into the tank;
Spreading the mesh sheet in the liquid surface direction of the resin-containing liquid and placing it on the liquid surface;
Moving the squeegee plate and the tank relative to each other while bringing the tip of the squeegee plate into contact with the mesh sheet, and sinking the mesh sheet in the resin-containing liquid;
Drying the resin-containing liquid in which the mesh sheet is submerged,
The manufacturing method of the composite mesh sheet containing this.   The method for producing a composite mesh sheet according to claim 1, wherein the resin-containing liquid is a solution or dispersion of a water-soluble resin.   The method for producing a composite mesh sheet according to claim 1, wherein the resin-containing liquid is a liquid containing a gelling polymer compound.   The method for producing a composite mesh sheet according to claim 3, wherein the resin-containing liquid is gelled and then dried.   The method for producing a composite mesh sheet according to any one of claims 1 to 4, wherein the mesh sheet is a knitted fabric mainly composed of thermoplastic fibers, and is fixed at a fixed length after knitting.   The composite mesh sheet according to any one of claims 1 to 5, wherein the mesh sheet is fixed and heat-fixed at a constant length without applying pressure to the inner periphery of the peripheral edge. Manufacturing method.

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