WO2010044323A1 - 複合シートの製造方法、複合シートを用いた吸収性物品の製造方法、及び複合シートの製造装置 - Google Patents
複合シートの製造方法、複合シートを用いた吸収性物品の製造方法、及び複合シートの製造装置 Download PDFInfo
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- WO2010044323A1 WO2010044323A1 PCT/JP2009/065832 JP2009065832W WO2010044323A1 WO 2010044323 A1 WO2010044323 A1 WO 2010044323A1 JP 2009065832 W JP2009065832 W JP 2009065832W WO 2010044323 A1 WO2010044323 A1 WO 2010044323A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/144—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
- B32B37/0053—Constructional details of laminating machines comprising rollers; Constructional features of the rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/14—Velocity, e.g. feed speeds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2555/00—Personal care
- B32B2555/02—Diapers or napkins
Definitions
- the present invention includes a first sheet that exhibits stretchability in the longitudinal direction by being stretched in the longitudinal direction, and a second sheet that has lower stretchability in the longitudinal direction than the stretchability of the first sheet.
- the present invention relates to a method of manufacturing a composite sheet having stretchability by joining together while aligning the longitudinal directions thereof, a method of manufacturing an absorbent article using the composite sheet, and an apparatus for manufacturing the composite sheet.
- an elastic sheet may be used as an exterior material of a disposable diaper as an example of an absorbent article.
- this stretchable sheet for example, a first sheet that exhibits high stretchability in the longitudinal direction by being stretched in the longitudinal direction and a second sheet that is less stretchable than the first sheet are joined together.
- the composite sheet is used.
- the stretchability of the composite sheet is mainly based on the stretchability of the first sheet. For this reason, it is necessary to bond the first sheet to the second sheet in a stretched state.
- a method shown in the perspective view of FIG. 1 is disclosed as an example of a method for manufacturing the composite sheet 3S.
- the first sheet 1S is subjected to a so-called gear stretching process by the gear roll 121 to cause the first sheet 1S to exhibit elasticity. Then, the first sheet 1S is stretched in the longitudinal direction while being wound around the upstream roll 131 and the downstream roll 141 and conveyed, and the stretched first sheet 1S is joined to the downstream joining roll. 151 and then joined to the second sheet 2S (see, for example, Patent Document 1).
- the first sheet 1S has high stretchability, in the transport path R151 for transporting the first sheet 1S in an extended state, that is, in the transport path R151 from the downstream roll 141 to the joining roll 151.
- the width may be greatly reduced (hereinafter also referred to as necking) due to the tension for the conveyance.
- necking it is difficult to join the second sheet 2S with the same width.
- seat 1S have uneven weight (partial variation of the basic weight (weight per unit area) of a sheet
- the first sheet 1S is greatly necked when stretched, It makes it more difficult to align the above width dimensions.
- the first sheet 1S is joined to the second sheet 2S in the downstream roll 141, the first sheet 1S is obtained.
- the conveyance path R151 can be omitted, and necking of the first sheet 1S due to the conveyance tension in the conveyance path R151 can be suppressed, and as a result, the width dimension between the first sheet 1S and the second sheet 2S can be reduced. It is considered that the alignment can be reduced.
- the present invention has been made in view of the conventional problems as described above, and includes a first sheet and a second sheet having a longitudinal stretchability lower than the stretchability of the first sheet.
- a composite sheet manufacturing method and composite sheet capable of reducing the mismatch of the width dimensions of the first sheet and the second sheet were used. It aims at providing the manufacturing method of an absorbent article, and the manufacturing apparatus of a composite sheet.
- the main invention for achieving the above object is:
- the first sheet that exhibits stretchability in the longitudinal direction by being stretched in the longitudinal direction, and the second sheet that has lower stretchability in the longitudinal direction than the stretchability of the first sheet are mutually longitudinal. It is a method of manufacturing a composite sheet having elasticity by joining while aligning the directions, While the first sheet is brought into contact with the upstream roll and the downstream roll rotating adjacent to each other and conveyed in the longitudinal direction of the first sheet, between the upstream roll and the downstream roll. By giving a circumferential speed difference, the first sheet is extended in the longitudinal direction, In the stretched state, the second sheet is overlapped and joined to the portion of the first sheet that is in contact with the downstream roll.
- the first sheet that exhibits stretchability in the longitudinal direction by being stretched in the longitudinal direction, and the second sheet that has lower stretchability in the longitudinal direction than the stretchability of the first sheet are mutually longitudinal.
- the downstream roll is a composite sheet manufacturing apparatus in which the second sheet is overlapped and joined to a portion of the first sheet that is in contact with the downstream roll in the extended state.
- FIG. 3A is a schematic diagram showing a state of the fiber before the stretching treatment (that is, unstretched).
- FIG. 3B is a schematic diagram illustrating a state of the fiber during the drawing process (that is, during loading).
- FIG. 3C is a schematic diagram showing the state of the fiber after the stretching treatment (that is, after unloading).
- Drawing 3D is a mimetic diagram showing the state of the fiber at the time of extending the nonwoven fabric after an extension process again.
- FIG. 6A is an explanatory diagram of the distance Lf between the operating positions Pa and Pa of the tensile load F that affects necking
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. 6A is an explanatory diagram of the distance Lf between the operating positions Pa and Pa of the tensile load F that affects necking
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. 6B is a graph showing that necking changes according to the distance Lf. is there.
- FIG. is a schematic diagram of the manufacturing method of the disposable diaper 5.
- FIG. It is a schematic diagram of the modification of
- the first sheet that exhibits stretchability in the longitudinal direction by being stretched in the longitudinal direction, and the second sheet that has lower stretchability in the longitudinal direction than the stretchability of the first sheet are mutually longitudinal. It is a method of manufacturing a composite sheet having elasticity by joining while aligning the directions, While the first sheet is brought into contact with the upstream roll and the downstream roll rotating adjacent to each other and conveyed in the longitudinal direction of the first sheet, between the upstream roll and the downstream roll. By giving a circumferential speed difference, the first sheet is extended in the longitudinal direction, A method for producing a composite sheet, wherein the second sheet is overlapped and joined to the portion of the first sheet that is in contact with the downstream roll in the stretched state.
- the downstream roll extends the first sheet between the upstream roll and the downstream roll in order to impart stretchability to the composite sheet.
- a second sheet is bonded to the first sheet. That is, the downstream roll functions as a joining roll for joining the second sheet in addition to the function as a roll for extending the first sheet.
- a method for producing such a composite sheet It is desirable that the first sheet is wound around the upstream roll and the downstream roll in an S shape.
- the first sheet is wound around the upstream roll and the downstream roll in an S shape. Therefore, by appropriately adjusting the arrangement of the upstream roll and the downstream roll, it is possible to shorten the length of the portion spanned between the upstream roll and the downstream roll in the first sheet. it can.
- the length of the part can be made shorter than the sum of the radius of the upstream roll and the radius of the downstream roll.
- the length of the spanned portion that is, the interval between the positions where the tensile load is applied at the time of extension can be reduced, thereby reducing necking caused by the tension at the time of extension. Can do.
- the necking of the first sheet is reduced when the both ends of the sample of the first sheet are gripped and pulled in the tensile test. This is based on the knowledge that when the interval between the gripping positions is widened, necking becomes large even if other conditions are the same. This will be described later.
- the length of the portion spanned between the upstream roll and the downstream roll is shorter than the sum of the radius of the upstream roll and the radius of the downstream roll. It is desirable that the upstream roll and the downstream roll are arranged.
- the length of the portion spanned between the upstream roll and the downstream roll in the first sheet can be further shortened. This necking during extension can be further reduced.
- a method for producing such a composite sheet It is desirable to set the peripheral speed of the downstream roll to 1.6 times or more the peripheral speed of the upstream roll.
- the first sheet can be reliably stretched.
- a method for producing such a composite sheet The first sheet is wound around the downstream roll at a predetermined winding angle, It is desirable that the phase angle from the winding start position of the first sheet on the downstream roll to the joining position where the second sheet is joined to the first sheet is 90 ° or more.
- the range of contact with the outer peripheral surface of the downstream roll of the first sheet is widened, and the contraction deformation in the width direction of the first sheet is reliably restrained by the frictional force due to the contact. Therefore, necking is less likely to occur. As a result, it is possible to reduce the mismatch in the width dimension between the first sheet and the second sheet.
- a method for producing such a composite sheet A first roll is provided so as to be rotatable facing the upstream roll, The first roll presses the first sheet in contact with the upstream roll against the upstream roll, A second roll is rotatably provided opposite the downstream roll, The second roll preferably presses the second sheet against the first sheet in contact with the downstream roll.
- the first sheet is sandwiched between the upstream roll and the first roll, so that the first sheet can be held in close contact with the upstream roll. Further, since the first sheet and the second sheet are sandwiched between the downstream roll and the second roll, the first sheet can be held in close contact with the downstream roll. Therefore, the slip between the upstream roll and the downstream roll and the first sheet can be suppressed, and the first sheet can be extended by the difference in the peripheral speed between the upstream roll and the downstream roll.
- a method for producing such a composite sheet The joining of the first sheet and the second sheet is made by an adhesive applied to the first sheet or the second sheet before the joining, It is desirable that the adhesive be applied intermittently in the longitudinal direction of the first sheet or the second sheet.
- the first sheet and the second sheet are disposed in the longitudinal direction. It is joined intermittently. Therefore, when the extension is released and contracted after the extension of the first sheet, it can be loosened at the non-joining part (part other than the joining part) of the second sheet, so the stretchability of the second sheet is low. Can prevent the contraction of the first sheet over the entire length of the first sheet, and as a result, the generated composite sheet can freely expand and contract based on the stretchability of the first sheet It becomes.
- a method for producing such a composite sheet By passing the first sheet, which has not been subjected to stretching treatment, through the gap between a pair of gear rolls rotating while meshing a plurality of teeth formed on the outer peripheral surface upstream of the upstream roll, One sheet is stretched by the teeth in the circumferential direction of the gear roll to express elasticity in the first sheet, It is desirable that the first sheet exhibiting the stretchability is supplied to the upstream roll.
- a method for producing such a composite sheet The process of extending the first sheet with the upstream roll and the downstream roll is a stretching process for causing the first sheet to exhibit the stretchability, or a stretching process for increasing the stretchability. It is desirable to be either.
- a method of manufacturing an absorbent article using such a composite sheet It is desirable to join an absorbent that absorbs liquid to the skin-side contact surface of the composite sheet.
- the first sheet that exhibits stretchability in the longitudinal direction by being stretched in the longitudinal direction, and the second sheet that has lower stretchability in the longitudinal direction than the stretchability of the first sheet are mutually longitudinal.
- the composite sheet manufacturing apparatus characterized by the above-mentioned.
- the downstream roll extends the first sheet between the upstream roll and the downstream roll so as to impart stretchability to the composite sheet.
- a second sheet is bonded to the first sheet. That is, the downstream roll functions as a joining roll for joining the second sheet, in addition to the function as a roll for extending the first sheet.
- the first sheet 1S is a sheet that exhibits stretchability in the same direction when stretched in the longitudinal direction
- the second sheet 2S is a stretchable sheet that is lower than the first sheet 1S that exhibits stretchability. It is.
- “highly stretchable” means stretchable deformation with a low elastic modulus, for example, means that the tensile load required to stretch the sheet until the total length becomes a predetermined multiple is small. Therefore, in place of the above-described relationship between the stretchability of the first sheet 1S and the second sheet 2S, it may be said that “the first sheet 1S stretches and deforms with a lower elastic modulus than the second sheet 2S”. Or, it can be said that “the first sheet 1S has a smaller tensile load than the second sheet 2S when the total length is increased to a predetermined multiple”. Also, “stretchability is expressed” means that the film is stretched and deformed with a low elastic modulus, and in short, is easily stretched with a small tensile load.
- the first sheet 1S having high elasticity does not undergo plastic deformation even when stretched to a predetermined magnification
- the second sheet 2S having low elasticity does not undergo plastic deformation when stretched to the predetermined magnification. It can also be said that it breaks.
- first sheet 1S exhibits stretchability by stretching
- the material thereof is, for example, a mixed fiber type obtained by mixing stretchable fibers and stretchable fibers by melt spinning or the like.
- Nonwoven fabric is used.
- the stretchable fiber refers to a fiber that can be elastically stretched
- the stretchable fiber refers to a fiber that can be stretched substantially inelastically. Therefore, in other words, the extensible fiber can be said to be a fiber that undergoes plastic deformation with an elongation smaller than the elastic limit elongation of the stretchable fiber.
- thermoplastic polyolefin fibers examples include thermoplastic polyolefin fibers
- stretchable fibers examples include thermoplastic elastomer fibers.
- the thermoplastic polyolefin fiber is, for example, a single fiber such as polypropylene fiber or polyester fiber, or a core-sheath composite fiber made of polypropylene or polyester
- thermoplastic elastomer fiber is, for example, polyurethane fiber or styrenic fiber. It is.
- Examples of the method for producing this nonwoven fabric include a spunbond method and a thermal bond method.
- the basis weight and fiber diameter of the nonwoven fabric are appropriately selected from the range of 20 to 50 (g / m 2 ) and the range of 10 to 30 ( ⁇ m), respectively, and further blending of extensible fibers and stretchable fibers The ratio is appropriately selected from the range of 20 to 80%.
- the nonwoven fabric exhibits stretchability, that is, the first sheet 1S is stretched.
- FIG. 2A and FIG. 2B are explanatory diagrams of the mechanism by which stretchability is manifested by this stretching treatment, and both diagrams show the load-elongation curve of the nonwoven fabric.
- a tension hereinafter also referred to as a load
- a load When a tension (hereinafter also referred to as a load) is applied to the nonwoven fabric within the elastic limit of the stretchable fiber in order to perform a stretching process on the unstretched nonwoven fabric, the load-elongation as shown in FIG. Draw a curve. That is, a load-elongation curve is drawn having a hysteresis such that the load at the same elongation becomes lower when the load is unloaded than when the tension is loaded.
- FIG. 3A is a schematic diagram showing the state of the fiber before the stretching process (that is, unstretched)
- FIG. 3B is a schematic diagram showing the state of the fiber during the stretching process (that is, under load)
- FIG. 3C is the stretching process. It is a schematic diagram which shows the state of the fiber after (that is, after unloading).
- the minimum unit structure constituting the nonwoven fabric can be modeled as a stretched fiber and a stretchable fiber connected in parallel as shown in FIG. 3A.
- the stretchable fiber When the unstretched nonwoven fabric shown in FIG. 3A is stretched, the stretchable fiber is elastically deformed as shown in FIG.3B, but the stretchable fiber having a smaller elastic limit elongation than the stretchable fiber, Plastic deformation is started from a relatively early stage, and is elongated and plastically deformed. Therefore, when the tension is unloaded from this state, as shown in FIG. 3C, the elastic fiber only has no elastic elongation, that is, its entire length returns to the same length as before the tension is applied. The stretchable fiber is stretched and slackened by the plastic elongation.
- the elastic fiber resists the above tension only by elastic deformation of the stretchable fiber until the slack of the stretchable fiber is fully extended and its full length is stretched.
- the nonwoven fabric stretches with a very low elastic modulus.
- the elastic-plastic deformation of the fiber also resists the tension, the magnitude of the tension required to stretch the nonwoven fabric increases rapidly from here. That is, the point at which the slackness of the extensible fiber disappears is the inflection point P1 in FIG. 2B. Therefore, the load-elongation curve after the stretching treatment is inflection point as shown in FIG. 2B.
- the nonwoven fabric expands and contracts with a very low elastic modulus, and when it exceeds the inflection point P1, a load-elongation curve in which the load increases rapidly is obtained.
- the tension is unloaded within the range R from the origin P0 to the inflection point P1, that is, within the range R of the “expressed expansion / contraction amount J”, the load at the time of loading in FIG. Needless to say, the load-elongation curve is traced back to the origin P0.
- stretch (processing) is distinguished from the term “stretching”. That is, when the sheet is simply stretched, it is expressed as “elongation”, but when the above-described stretchability is expressed or the stretchability is increased by the stretch, the stretch is expressed as “stretch”. . That is, “stretching” is an aspect of “extension”. Note that the increase in stretchability means that the above-described stretch amount J (FIG. 2B) is increased.
- the second sheet 2S is a sheet having lower elasticity than the first sheet 1S, and here, a sheet having almost no elasticity is used.
- the almost non-stretchable sheet is a sheet that is plastically deformed and broken when it is stretched to 1.2 times, for example.
- the second sheet 2S is not particularly limited in terms of material other than the condition that its stretchability is lower than that of the first sheet 1S.
- a spunbond method or a point bond using polypropylene fiber or PET fiber is used.
- a non-woven fabric having a basis weight of 10 to 50 (g / m 2 ) produced by a method or the like is used, but it goes without saying that a non-woven fabric or a film may be used.
- FIG. 4 is an explanatory diagram of a method for manufacturing the composite sheet 3S, and shows a manufacturing apparatus 10 according to the manufacturing method in a side view.
- the processing according to this manufacturing method is performed while transporting the first sheet 1S and the second sheet 2S along a predetermined transport path in the state of strips continuous in the longitudinal direction.
- each sheet 1S, 2S are orthogonal to each other, and each roll 11, 21, 31, 41, 33, 43 such as the conveyance roll 11 is It is assumed that the rotation axis is arranged in a direction parallel to the width direction.
- gear stretching step In the gear stretching step, as described above, for example, a so-called gear stretching process is performed on the unstretched first sheet 1S. Therefore, in the same process, as shown in FIG. 4, a pair of upper and lower gear rolls 21 and 21 are arranged. On the outer peripheral surfaces 21a and 21a of the gear rolls 21 and 21, teeth 21t (teeth having the same tooth profile as a so-called "spur gear") are formed in a wave shape at a predetermined formation pitch P along the circumferential direction.
- the unstretched first sheet 1S is passed through the roll gap between the gear rolls 21 and 21,
- the first sheet 1S is stretched in the circumferential direction of the gear roll 21 by deforming the first sheet 1S into a three-point bend by the teeth 21t of the upper gear roll 21 and the teeth 21t of the lower gear roll 21 that are engaged with each other.
- seat 1S expresses a stretching property.
- the 1st sheet 1S in which the elasticity was expressed is sent to the next extension joining process at the same speed as the peripheral speed V21.
- the draw ratio Mg in this gear extension is adjusted to an arbitrary value in the range of 1.6 to 3.0, for example, and the adjustment of the draw ratio Mg is performed by, for example, the teeth 21t and 21t of the upper and lower gear rolls 21 and 21. This is done by changing the meshing depth.
- an upstream roll 31 and a downstream roll 41 are arranged adjacent to each other upstream and downstream of the transport path. And the 1st sheet
- the rolls 31 and 41 are transported at substantially the same speed as the peripheral speeds V31 and V41 of the rolls 31 and 41 (speeds of the outer peripheral faces of the rolls 31 and 41) without slipping with respect to the outer peripheral surfaces of the rolls 31 and 41.
- the circumferential speed V31 of the upstream roll 31 is set to be approximately the same speed as the circumferential speed V21 of the gear roll 21, but the circumferential speed 41 of the downstream roll 41 is higher than the circumferential speed V31 of the upstream roll 31. It is set to a large value. Therefore, the first sheet 1 ⁇ / b> S is extended by these rolls 31 and 41.
- the stretch ratio Ms may be larger than the stretch ratio Mg.
- the first sheet 1S is stretched by these rolls 31 and 41, that is, the first sheet.
- the stretchability of the first sheet 1S increases.
- the second roll 2S is separately supplied to the downstream roll 41 in a state where the second sheet 2S is continuous in the longitudinal direction and at substantially the same speed as the peripheral speed V41. Then, at the position Ps where the first sheet 1S is in contact with the outer peripheral surface of the downstream roll 41 with almost no relative slip, the second sheet 2S is superposed on and joined to the first sheet 1S.
- the sheet 3S is generated and sent to a lower process (not shown) at approximately the same speed as the peripheral speed V41.
- the downstream roll 41 functions as a joining roll that joins the first sheet 1S to the second sheet 2S in addition to the function as the stretching roll that stretches the first sheet 1S. Therefore, according to this configuration, the first sheet 1S in the stretched state does not have to be transported over to the position of the separately provided joining roll, and thereby the first sheet 1S is caused by the tension during the transport of the transport. Necking that can occur in the second sheet 2S can be suppressed, and as a result, the width dimension mismatch with the second sheet 2S can be reduced.
- an appropriate adhesive such as a hot melt adhesive is used. That is, the hot melt adhesive HMA is applied to the second sheet 2S in advance continuously or intermittently over a substantially entire surface at a position upstream of the downstream roll 41 in advance.
- this adhesive may be applied to the first sheet 1S instead of the second sheet 2S.
- the joining method is not limited to adhesion, and welding such as heat sealing or sonic sealing may be used.
- a so-called S hook is adopted as a method of winding the first sheet 1 ⁇ / b> S around the upstream roll 31 and the downstream roll 41.
- the upstream roll 31 and the downstream roll 41 are brought into contact with opposite surfaces with respect to the front and back of the first sheet 1S, and the rotation directions of the rolls 31 and 41 are also opposite to each other.
- the first sheet 1S is wound around the upstream roll 31 and the downstream roll 41 in an S shape.
- the portion 1Sa of the first sheet 1S spanned between the upstream roll 31 and the downstream roll 41 is reduced.
- the length can be shortened, and as a result, necking during extension can be more effectively suppressed. Details are as follows.
- the first sheet 1S may be necked due to the tension during the extension, and the size of the necking (the amount of contraction of the width of the first sheet 1S) is a pair for applying tension to the first sheet 1S.
- the size of the necking (the amount of contraction of the width of the first sheet 1S) is a pair for applying tension to the first sheet 1S.
- the distance Lf between the operating positions Pa and Pa of the tensile load F see FIG. 6A. That is, when the interval Lf is wide, necking increases, and when the interval Lf is narrow, necking decreases.
- FIG. 6B is a graph for explaining this tendency.
- both ends in the longitudinal direction of the sample of the first sheet 1S are gripped by a gripping portion of a tensile tester, and a tensile load F of 3.5 N and a predetermined elongation rate (the above-mentioned elongation
- a predetermined elongation rate the above-mentioned elongation This is the same definition as the magnification Ms, and here shows the change in the width dimension W of the sample when pulled to about 2.5 times.
- the distance between chucks on the horizontal axis in FIG. 6B is the distance between the gripping portions of the tensile tester, that is, the same as the distance Lf between the operation positions Pa and Pa of the tensile load F described above.
- the vertical axis represents the width dimension W of the sample under the action of the tensile load F.
- the width dimension W of the sample at the time of no load is 160 mm, and this width dimension W becomes small, so that necking is large.
- the length of the portion 1Sa of the first sheet 1S spanned between the upstream roll 31 and the downstream roll 41 is set to the upstream roll. It is physically impossible to make it shorter than the sum of the radius R31 of 31 and the radius R41 of the downstream roll 41, and there is a slight problem in terms of necking deterrence.
- the length 1Sa of the portion of the first sheet 1S spanned between the upstream roll 31 and the downstream roll 41 is set to the radius of the upstream roll 31. It is possible to make it shorter than the sum of R31 and the radius R41 of the downstream roll 41.
- the length of the portion 1Sa of the bridged first sheet 1S is set between the radius R31 and the radius R41. If it is shorter than the sum, necking during expansion can be effectively reduced.
- the length of the portion 1Sa of the first sheet 1S spanned between the upstream roll 31 and the downstream roll 41 is “downstream in the contact portion between the first sheet 1S and the upstream roll 31”.
- the distance between the end and the upstream end at the contact portion between the first sheet 1S and the downstream roll 41 can be expressed as” the distance between the upstream roll 31 and the downstream roll 41 ". It can also be expressed as “the length of a portion 1Sa which is a portion of one sheet 1S and is not in contact with any of the upstream roll 31 and the downstream roll 41”.
- the reason why the size of necking shows the dependence of the size of the distance Lf between the operating positions Pa and Pa of the tensile load F is that the first sheet 1S generated at the operating position Pa of the tensile load F is as follows. This is considered to be because the influence of the force constraining the contraction deformation in the width direction becomes weaker as the distance from the action position Pa increases.
- the lower limit value of the length of the portion 1Sa of the first sheet 1S spanned between the upstream roll 31 and the downstream roll 41 is not described in the S-hanging configuration of FIG. However, even in the configuration of the lower limit value of the length, it goes without saying that the first sheet 1S can pass through the gap between the upstream roll 31 and the downstream roll 41.
- the size of the gap is set in the range of 1.0 to 300 times the thickness of the first sheet 1S, for example.
- the first roll 33 is provided to face the outer peripheral surface of the upstream roll 31, and the first sheet 1 ⁇ / b> S is pressed against the outer peripheral surface of the upstream roll 31 by the first roll 33. And good. If it does so, it will become possible to ensure reliably the action position Pa of the tensile load F by the upstream roll 31 side.
- a second roll 43 is provided to face the outer peripheral surface of the downstream roll 41, and the first sheet 1 ⁇ / b> S and the second roll 43 are provided on the outer peripheral surface of the downstream roll 41. It is preferable to press the second sheet 2S.
- first and second rolls 33 and 43 are either driven rolls or drive rolls as long as they rotate at substantially the same peripheral speeds V31 and V41 as the corresponding upstream and downstream rolls 31 and 41, respectively. I do not care.
- the upstream roll 31 and the downstream roll 41 instead of or in addition to the first and second rolls 33 and 43, the upstream roll 31 and the downstream roll 41.
- a plurality of intake holes may be provided on the outer peripheral surface of the first sheet 1S to adsorb the first sheet 1S to the outer peripheral surface, and furthermore, an anti-slip process such as engraving a large number of irregularities on the outer peripheral surface may be performed. Also good.
- the second sheet 2S starts from the winding start position Pw of the first sheet 1S in the downstream roll 41.
- the phase angle to the joining position Ps joined to one sheet 1S is 90 ° or more. If the phase angle is set to 90 ° or more in this way, the contact range between the outer peripheral surface of the downstream roll 41 and the first sheet 1S is widened, and the contraction deformation in the width direction of the first sheet 1S is caused by the frictional force due to the contact. Since it is restrained, necking is less likely to occur.
- the peripheral speed V41 of the downstream roll 41 is set to a value exceeding 1.05 times the peripheral speed V31 of the upstream roll 31, and more preferably 1.6 times or more. This is because a circumferential speed difference of about 0 to 5% is required between the upstream roll 31 and the downstream roll 41 in order to generate the tension necessary for conveying the first sheet 1S.
- FIG. 7 is a perspective view schematically showing a method for manufacturing a disposable diaper as an example of the absorbent article 5.
- the composite sheet 3S described above is used as an exterior material for the diaper 5.
- the exterior material forms the exterior of the diaper 5 by covering the absorber 7 that absorbs liquid from the outside.
- various processes are given with respect to the said composite sheet 3S, while the composite sheet 3S is conveyed along the said longitudinal direction in the state continuous in the longitudinal direction, and the diaper 5 is manufactured.
- the direction orthogonal to the longitudinal direction is referred to as the width direction, but this width direction means the width direction of the composite sheet 3S and is different from the width direction of the diaper 5.
- the manufacturing method of this diaper 5 includes a first step S10 for generating a composite sheet 3S continuous in the longitudinal direction, a leg elastic member 8a and a waist elastic member 8b on the composite sheet 3S.
- the second step S20 for joining the sheet the third step S30 for forming the opening 9 for the leg portion in the composite sheet 3S, and the absorbent body intermittently in the longitudinal direction on the skin-side contact surface of the composite sheet 3S.
- 1st process S10 is the same as the manufacturing method of composite sheet 3S mentioned above. That is, the manufacturing apparatus 10 described above is disposed at the position of the first step S10, and thereby the composite sheet 3S having stretchability is generated.
- the leg elastic member 8a and the waist elastic member 8b according to the second step S20 are, for example, thread rubber that is continuously supplied. These elastic members 8a and 8b are fixed to an appropriate continuous sheet 8c while being reciprocally moved in the width direction by an appropriate guide member (not shown) in the process prior to the second process S20. When the sheet 8c is superimposed on the composite sheet 3S in the second step S20, the elastic members 8a and 8b are interposed and joined between the continuous sheet 8c and the composite sheet 3S.
- the present invention is not limited to this.
- the sheet may be attached to the composite sheet 3S in the second step S20.
- a separate sheet may be attached to the composite sheet 3S so that the elastic members 8a and 8b are sandwiched between the composite sheets 3S.
- the leg opening 9 according to the third step S30 is formed by punching with a die cutter (not shown), for example.
- the absorbent body 7 according to the fourth step S40 has, for example, a pulp fiber molded into a predetermined shape as a main body, which is covered with a liquid-permeable sheet from the skin side contact surface and from the non-skin side contact surface. Is covered with a liquid-impermeable sheet. Then, when joining on the composite sheet 3S, the absorbent body 7 is placed on the composite sheet 3S with the longitudinal direction of the absorber 7 directed in the width direction of the composite sheet 3S.
- the liquid permeable sheet on the skin side contact surface side may be provided with a three-dimensional gather, and between the main body and the liquid permeable sheet or liquid impermeable sheet, a tissue paper or the like is provided. A liquid permeable sheet may be inserted.
- the composite sheet 3S is gradually folded into two so that the skin-side contact surface side is inward by an appropriate guide member (not shown) in the process of being transported in the longitudinal direction.
- the ventral portion and the back portion of 5 are overlapped.
- the joint portion 6 according to the sixth step S60 is formed by welding, for example, by heat sealing or sonic sealing.
- this junction part 6 is located in the flank part of the diaper 5.
- the composite sheet 3S in a folded state is divided at the joint 6 by a cutter roll (not shown), for example, whereby a diaper 5 for each product is generated.
- the absorbent body 7 is joined to the composite sheet 3S in the fourth step S40, but the joining timing is not limited to this.
- the absorbent body 7 may be bonded in advance on the second sheet 2S in an upper process than the first process S10.
- a recess is formed on the outer peripheral surface of the downstream roll 41 in order to process the recess for accommodating the absorber 7 into the first sheet 1S.
- the manufacturing method in which the gear stretching step is performed before the elongation joining step is illustrated, but the gear stretching step may be omitted. That is, you may supply the unstretched 1st sheet
- the stretching process of the first sheet 1S by the upstream roll 31 and the downstream roll 41 is a process that also serves as a stretching process that develops the stretchability of the first sheet 1S.
- a mixed fiber type nonwoven fabric including two types of fibers ie, an extensible fiber and a stretchable fiber
- the number of types of fibers may be three or more, and a layer of only extensible fibers and a layer of only stretchable fibers may be divided into two or more layers in the thickness direction.
- the material of the first sheet 1S may be a film-like product in which a film made of an extensible material and a film made of an elastic material are joined, or a film made of an extensible material or an elastic material.
- the sheet is not limited to the above as long as it is a sheet that exhibits stretchability as shown in FIG. 2B in the stretching process, and the material of the first sheet 1S is at least one of stretchable fibers and stretchable fibers. It may be a non-woven fabric or a woven fabric, or may be a film made of at least one of an extensible material and an elastic material.
- the highly elastic first sheet 1 ⁇ / b> S referred to here is a sheet that stretches without breaking plastic deformation when stretched from a natural length to 1.6 times, for example.
- the configuration in which the first sheet 1S is hung on the upstream roll 31 and the downstream roll 41 is illustrated, but the second sheet is placed on the portion of the first sheet 1S that is in contact with the downstream roll 41.
- the configuration is not limited to this as long as 2S is superposed and joined.
- the configuration shown in FIG. 5 may be used.
- the configuration in FIG. 5 will be described in detail.
- the upstream roll 31 and the downstream roll 41 are arranged on the same side with respect to the front and back of the first sheet 1S (in the example of FIG. And the rotational directions of the rolls 31 and 41 are also aligned in the same direction.
- the structural example shown in FIG. 8 can be illustrated as the modification.
- the first sheet 1S is only brought into contact without being wound around the rolls 31 and 41.
- the first sheet 1S is wound around the upstream roll 31 and the downstream roll 41 in a U-shape.
- tension can be applied to the first sheet 1S by the frictional force with the outer peripheral surfaces of the rolls 31 and 41 based on the winding angle ⁇ . Therefore, the first roll 33 that is essential for the purpose of applying tension to the first sheet 1S in the former configuration of FIG. 5, that is, the first roll 33 that presses the first sheet against the outer peripheral surface of the upstream roll 31 is provided. There is a merit that can be omitted.
- the radii R31 and R41 of the upstream roll 31 and the downstream roll 41 are not mentioned, but they may be the same diameter or may not be the same diameter.
- the presence or absence of heating or cooling of the upstream roll 31 and the downstream roll 41 has not been described.
- a heater or a cooler may be incorporated in the upstream roll 31 and the downstream roll 41. .
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Abstract
Description
長手方向に延伸処理されることにより前記長手方向の伸縮性が発現される第1シートと、前記第1シートの前記伸縮性よりも長手方向の伸縮性が低い第2シートとを、互いの長手方向を揃えながら接合して、伸縮性を有した複合シートを製造する方法であって、
互いに隣り合って回転する上流側ロールと下流側ロールとに前記第1シートを当接させて前記第1シートの長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造方法である。
長手方向に延伸処理されることにより前記長手方向の伸縮性が発現される第1シートと、前記第1シートの前記伸縮性よりも長手方向の伸縮性が低い第2シートとを、互いの長手方向を揃えながら接合して複合シートを製造する製造装置であって、
互いに隣り合って回転する上流側ロールと下流側ロールとを有し、
前記上流側ロールと前記下流側ロールとに前記第1シートを当接させて前記長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
前記下流側ロールは、当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造装置である。
互いに隣り合って回転する上流側ロールと下流側ロールとに前記第1シートを当接させて前記第1シートの長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造方法。
前記第1シートは、前記上流側ロール及び前記下流側ロールにS字状に掛け回されているのが望ましい。
前記第1シートにおいて前記上流側ロールと前記下流側ロールとの間に架け渡された部分の長さが、前記上流側ロールの半径と前記下流側ロールの半径との和よりも短くなるように、前記上流側ロールと前記下流側ロールとが配置されているのが望ましい。
前記下流側ロールの周速を、前記上流側ロールの周速の1.6倍以上に設定するのが望ましい。
前記第1シートは前記下流側ロールに所定の巻き付き角度で巻き付いており、
前記下流側ロールにおける前記第1シートの巻き付き開始位置から、前記第2シートが前記第1シートに接合される接合位置までの位相角が90°以上であるのが望ましい。
前記上流側ロールに対向して回転可能に第1ロールが設けられ、
前記第1ロールは、前記上流側ロールに当接している前記第1シートを前記上流側ロールに押し付け、
前記下流側ロールに対向して回転可能に第2ロールが設けられ、
前記第2ロールは、前記下流側ロールに当接している前記第1シートに前記第2シートを押し付けるのが望ましい。
前記第1シート及び前記第2シートの接合は、前記接合前に前記第1シート又は前記第2シートに塗布された接着材によってなされ、
前記接着材の塗布は、前記第1シート又は前記第2シートの長手方向に間欠的に行われるのが望ましい。
前記上流側ロールよりも上流側において、外周面に形成された複数の歯を互いに噛み合わせながら回転する一対のギアロールの間隙に、延伸処理を施していない前記第1シートを通すことにより、該第1シートを前記歯によって前記ギアロールの周方向に延伸して前記第1シートに伸縮性を発現し、
該伸縮性が発現された前記第1シートが、前記上流側ロールへ供給されるのが望ましい。
前記上流側ロールと前記下流側ロールとで前記第1シートを伸長する処理は、前記第1シートに前記伸縮性を発現させるための延伸処理か、又は、前記伸縮性を増加させるための延伸処理のどちらかであるのが望ましい。
前記複合シートの肌側当接面に、液体を吸収する吸収体を接合するのが望ましい。
長手方向に延伸処理されることにより前記長手方向の伸縮性が発現される第1シートと、前記第1シートの前記伸縮性よりも長手方向の伸縮性が低い第2シートとを、互いの長手方向を揃えながら接合して複合シートを製造する製造装置であって、
互いに隣り合って回転する上流側ロールと下流側ロールとを有し、
前記上流側ロールと前記下流側ロールとに前記第1シートを当接させて前記長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
前記下流側ロールは、当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造装置。
本実施形態の複合シート3Sの製造方法の説明の前に、当該複合シート3Sの材料たる第1シート1S及び第2シート2Sについて説明する。
第1シート1Sは、前述したように、延伸処理により伸縮性が発現するものであり、その材料としては、例えば、溶融紡糸等によって伸長性繊維と伸縮性繊維とを混合してなる混繊タイプの不織布が使用される。ここで、伸縮性繊維とは、弾性的に伸長可能な繊維のことを言い、伸長性繊維とは、概ね非弾性的に伸長可能な繊維のことを言う。よって、換言すると、伸長性繊維とは、伸縮性繊維の弾性限界の伸びよりも小さな伸びで塑性変形を起こす繊維であると言うこともできる。
M=Lb/La … 式1
第2シート2Sは、第1シート1Sよりも伸縮性の低いシートであり、ここでは、殆ど伸縮性の無いシートが用いられている。この殆ど伸縮性の無いシートと言うのは、例えば1.2倍になるまで伸ばすと塑性変形破断してしまうようなシートのことである。
図4は、複合シート3Sの製造方法の説明図であり、同製造方法に係る製造装置10を側面視で示している。この製造方法に係る処理は、第1シート1Sと第2シート2Sとを、それぞれ長手方向に連続した帯状シートの状態で所定の搬送経路に沿って搬送しながら行われ、その処理工程として、(1)第1シート1Sにギア延伸処理を施して第1シート1Sに伸縮性を発現するギア延伸工程と、(2)伸縮性が発現された第1シート1Sを伸長するとともに、当該伸長状態の第1シート1Sに対して第2シート2Sを接合する伸長接合工程と、を備えている。
ギア延伸工程では、上述したように、例えば未延伸状態の第1シート1Sに対して所謂ギア延伸処理を施す。そのため、同工程には、図4に示すように、上下一対のギアロール21,21が配置されている。各ギアロール21,21の外周面21a,21aには、周方向に沿って所定の形成ピッチPで波状に歯21t(所謂「平歯車」と同じ歯形の歯)が形成されている。よって、これらギアロール21,21が所定の周速V21(歯先での速度)で駆動回転している間に、これらギアロール21,21のロール間隙に未延伸の第1シート1Sを通し、その際に互いに噛み合う上ギアロール21の歯21tと下ギアロール21の歯21tとによって前記第1シート1Sを三点曲げ状に変形することによりギアロール21の周方向に第1シート1Sを延伸する。そして、この延伸後には、第1シート1Sに伸縮性が発現する。伸縮性が発現された第1シート1Sは、前記周速V21と概ね同じ速度で次の伸長接合工程に送られる。
伸長接合工程では、ギア延伸工程から送られる第1シート1Sを伸長し、当該伸長状態の第1シート1Sに対して第2シート2Sを接合する。なお、第1シート1Sを伸長状態で第2シート2Sに接合するのは、第1シート1Sの高い伸縮性に基づいて複合シート3Sに伸縮性を付与するためである。
図7は、吸収性物品5の一例としての使い捨ておむつの製造方法を模式的に示す斜視図である。この例では、上述の複合シート3Sをおむつ5の外装材として使用している。外装材は、液体を吸収する吸収体7を外側から覆っておむつ5の外装をなすものである。そして、この製造方法では、複合シート3Sがその長手方向に連続した状態で前記長手方向に沿って搬送される間に、当該複合シート3Sに対して各種加工が施されて、おむつ5が製造される。なお、以下では、前記長手方向と直交する方向を幅方向と言うが、この幅方向は、複合シート3Sの幅方向の意味であって、おむつ5の幅方向とは異なる。
以上、本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されるものではなく、以下に示すような変形が可能である。
2S 第2シート、3S 複合シート、
5 おむつ(吸収性物品)、6 接合部、7 吸収体、
8a レッグ部用弾性部材、8b ウエスト部用弾性部材、
8c 連続シート、9 レッグ部用開口部、
11 搬送ロール、10 複合シートの製造装置、
21 ギアロール、21a 外周面、21t 歯、
31 上流側ロール、33 押し付けロール(第1ロール)、
41 下流側ロール、43 押し付けロール(第2ロール)、
E 延伸量、F 引張荷重、J 伸縮量、Lf 間隔、
P0 原点、P1 変曲点、Pa 作用位置、Ps 接合位置、
V21 周速、V31 周速、V41 周速、
S10 第1工程、S20 第2工程、S30 第3工程、
S40 第4工程、S50 第5工程、S60 第6工程、
S70 第7工程
Claims (11)
- 長手方向に延伸処理されることにより前記長手方向の伸縮性が発現される第1シートと、前記第1シートの前記伸縮性よりも長手方向の伸縮性が低い第2シートとを、互いの長手方向を揃えながら接合して、伸縮性を有した複合シートを製造する方法であって、
互いに隣り合って回転する上流側ロールと下流側ロールとに前記第1シートを当接させて前記第1シートの長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造方法。 - 請求項1に記載の複合シートの製造方法であって、
前記第1シートは、前記上流側ロール及び前記下流側ロールにS字状に掛け回されていることを特徴とする複合シートの製造方法。 - 請求項2に記載の複合シートの製造方法であって、
前記第1シートにおいて前記上流側ロールと前記下流側ロールとの間に架け渡された部分の長さが、前記上流側ロールの半径と前記下流側ロールの半径との和よりも短くなるように、前記上流側ロールと前記下流側ロールとが配置されていることを特徴とする複合シートの製造方法。 - 請求項1乃至3の何れかに記載の複合シートの製造方法であって、
前記下流側ロールの周速を、前記上流側ロールの周速の1.6倍以上に設定することを特徴とする複合シートの製造方法。 - 請求項1乃至4の何れかに記載の複合シートの製造方法であって、
前記第1シートは前記下流側ロールに所定の巻き付き角度で巻き付いており、
前記下流側ロールにおける前記第1シートの巻き付き開始位置から、前記第2シートが前記第1シートに接合される接合位置までの位相角が90°以上であることを特徴とする複合シートの製造方法。 - 請求項1乃至5の何れかに記載の複合シートの製造方法であって、
前記上流側ロールに対向して回転可能に第1ロールが設けられ、
前記第1ロールは、前記上流側ロールに当接している前記第1シートを前記上流側ロールに押し付け、
前記下流側ロールに対向して回転可能に第2ロールが設けられ、
前記第2ロールは、前記下流側ロールに当接している前記第1シートに前記第2シートを押し付けることを特徴とする複合シートの製造方法。 - 請求項1乃至6の何れかに記載の複合シートの製造方法であって、
前記第1シート及び前記第2シートの接合は、前記接合前に前記第1シート又は前記第2シートに塗布された接着材によってなされ、
前記接着材の塗布は、前記第1シート又は前記第2シートの長手方向に間欠的に行われることを特徴とする複合シートの製造方法。 - 請求項1乃至7の何れかに記載の複合シートの製造方法であって、
前記上流側ロールよりも上流側において、外周面に形成された複数の歯を互いに噛み合わせながら回転する一対のギアロールの間隙に、延伸処理を施していない前記第1シートを通すことにより、該第1シートを前記歯によって前記ギアロールの周方向に延伸して前記第1シートに伸縮性を発現し、
該伸縮性が発現された前記第1シートが、前記上流側ロールへ供給されることを特徴とする複合シートの製造方法。 - 請求項1乃至8の何れかに記載の複合シートの製造方法であって、
前記上流側ロールと前記下流側ロールとで前記第1シートを伸長する処理は、前記第1シートに前記伸縮性を発現させるための延伸処理か、又は、前記伸縮性を増加させるための延伸処理のどちらかであることを特徴とする複合シートの製造方法。 - 請求項1乃至9の何れかに記載の複合シートを用いた吸収性物品の製造方法であって、
前記複合シートの肌側当接面に、液体を吸収する吸収体を接合することを特徴とする吸収性物品の製造方法。 - 長手方向に延伸処理されることにより前記長手方向の伸縮性が発現される第1シートと、前記第1シートの前記伸縮性よりも長手方向の伸縮性が低い第2シートとを、互いの長手方向を揃えながら接合して複合シートを製造する製造装置であって、
互いに隣り合って回転する上流側ロールと下流側ロールとを有し、
前記上流側ロールと前記下流側ロールとに前記第1シートを当接させて前記長手方向に搬送する間に、前記上流側ロールと前記下流側ロールとの間で周速差をつけることによって、前記第1シートを前記長手方向に伸長し、
前記下流側ロールは、当該伸長状態で前記下流側ロールに当接している前記第1シートの部分に、前記第2シートを重ねて接合することを特徴とする複合シートの製造装置。
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| CN200980140850.9A CN102186673B (zh) | 2008-10-15 | 2009-09-10 | 复合片的制造方法、采用复合片的吸收性物品的制造方法及复合片的制造装置 |
| EP09820501.6A EP2340935B2 (en) | 2008-10-15 | 2009-09-10 | Method of manufacturing composite sheet, method of producing absorptive article using composite sheet, and device for manufacturing composite sheet |
| BRPI0914062A BRPI0914062A2 (pt) | 2008-10-15 | 2009-09-10 | método de fabricação de folha composta, método de produção de artigo absorvente utilizado folha composta, e aparelho para fabricação de folha composta |
| AU2009304794A AU2009304794A1 (en) | 2008-10-15 | 2009-09-10 | Method of producing composite sheet, method of producing absorbent article using composite sheet and apparatus that produces composite sheet |
| US13/124,387 US9067396B2 (en) | 2008-10-15 | 2009-09-10 | Method of producing composite sheet, method of producing absorbing article using composite sheet and apparatus that produces composite sheet |
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| JP2008266716A JP5452903B2 (ja) | 2008-10-15 | 2008-10-15 | 複合シートの製造方法、複合シートを用いた吸収性物品の製造方法、及び複合シートの製造装置 |
| JP2008-266716 | 2008-10-15 |
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| US (1) | US9067396B2 (ja) |
| EP (1) | EP2340935B2 (ja) |
| JP (1) | JP5452903B2 (ja) |
| KR (1) | KR101639091B1 (ja) |
| CN (1) | CN102186673B (ja) |
| AU (1) | AU2009304794A1 (ja) |
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| WO (1) | WO2010044323A1 (ja) |
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| BR112014032504A2 (pt) * | 2012-07-13 | 2017-06-27 | Zuiko Corp | elemento extensível composto, método para a produção do dito elemento extensível composto, artigo usado usando o dito elemento extensível composto e método para a produção do dito artigo usado |
| MX2016007516A (es) * | 2013-12-20 | 2016-09-13 | Kimberly Clark Co | Compuestos termoadheridos por alargamiento basados en filamentos elasticos hidroenredados y metodos para fabricarlos. |
| AU2014368995B2 (en) * | 2013-12-20 | 2018-05-24 | Kimberly-Clark Worldwide, Inc. | Hydroentangled elastic film-based, stretch-bonded composites and methods of making same |
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| JP6018164B2 (ja) * | 2014-12-09 | 2016-11-02 | ユニ・チャーム株式会社 | 吸収性物品の製造方法及び吸収性物品の製造装置 |
| JP6521685B2 (ja) * | 2015-03-20 | 2019-05-29 | 大王製紙株式会社 | 吸収性物品 |
| JP5994031B1 (ja) * | 2015-06-18 | 2016-09-21 | ユニ・チャーム株式会社 | 吸収性物品に係るシート状部材の製造方法、及び製造装置 |
| SE540294C2 (en) * | 2015-09-04 | 2018-05-22 | Lamiflex Ab | Laminated film with stretched layers and method of manufacturing such film |
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| JP6454664B2 (ja) * | 2016-08-19 | 2019-01-16 | 大王製紙株式会社 | 伸縮シートの製造方法 |
| US12083779B2 (en) | 2017-08-31 | 2024-09-10 | Kimberly-Clark Worldwide, Inc. | Composite elastic laminate having discrete film segments |
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Also Published As
| Publication number | Publication date |
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| EP2340935B2 (en) | 2019-04-03 |
| EP2340935A1 (en) | 2011-07-06 |
| KR101639091B1 (ko) | 2016-07-12 |
| EP2340935A4 (en) | 2013-06-05 |
| JP2010094879A (ja) | 2010-04-30 |
| EP2340935B1 (en) | 2016-04-06 |
| JP5452903B2 (ja) | 2014-03-26 |
| CN102186673B (zh) | 2014-08-27 |
| KR20110069171A (ko) | 2011-06-22 |
| AU2009304794A1 (en) | 2010-04-22 |
| BRPI0914062A2 (pt) | 2015-11-03 |
| CN102186673A (zh) | 2011-09-14 |
| US20110253293A1 (en) | 2011-10-20 |
| US9067396B2 (en) | 2015-06-30 |
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