JP2007168181A - Perforation or stretching device for sheet material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a perforation or stretching device for a sheet material which is capable of applying perforation or stretching processing to the sheet material in a state that a tensile force is applied to the sheet material in its width direction, and capable of forming perforation having a sharp contour in the sheet material or largely stretching the sheet material, and a perforation or stretching method. <P>SOLUTION: The perforation or stretching device of the sheet material is equipped with a first roll 2 having a large number of ridges 21 extending in its peripheral direction and a second roll 3 having the drilling pins 31 inserted in gaps between the ridges 21 and 21 of the first roll 2. Biting parts 2S and 3S wherein protruded and recessed parts are alternately formed in a peripheral direction are formed at both outside parts of regions having the ridges or the drilling pins in axial length directions of the respective first and second rolls and perforation or stretching processing can be applied to the sheet material 4 while pressing both sides of the sheet material 4 by being sandwiched between the bitting part 2S of the first roll and the bitting part 3S of the second roll. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and method for subjecting a sheet material to opening or stretching.

As a method for forming a three-dimensional opening in a sheet material, the applicant previously has a plurality of rows of pyramid or cone-shaped convex pins along the sheet material conveyance direction. A sheet material is introduced between a pin roll (first pressing mold) arranged in parallel to a protruding roll (second pressing mold) having a protruding portion fitted between the multiple rows, A method of forming a number of three-dimensional openings (through holes) in a sheet material has been proposed (for example, see Patent Documents 1 and 2).
However, in the conventional opening method, there is a case where an opening with a clear outline cannot be formed.

In addition, a stretch-free laminated web having substantially no tension is supplied between a pair of opposed rolls having complementary three-dimensional surfaces, and the portions of the stretched laminated web to be gradually stretched are constrained. In this state, a method of gradually stretching the stretched laminated web is known (see Patent Document 3). In this method, the sheet material is gripped by the nip between the nip rolls or between the roll and the belt, and the sheet material is prevented from approaching the central portion, and is sandwiched between the pair of rolls and stretched. Yes.
However, in the case of a sheet material with high lateral strength, the sheet material is gripped between nip rolls or between a roll and a belt, particularly when the sheet material is greatly pushed into a recess of one roll to be stretched. By simply holding it down, the sheet material gradually moves to the center. Further, only restraining both sides of the sheet material to prevent the sheet material from approaching the central portion does not generate a force that pulls the sheet material in the width direction, and therefore the extent of stretching the sheet material is not large.

Japanese Patent Laid-Open No. 06-330443 JP 05-317358 A Japanese Translation of National Publication No. 06-505681

  Accordingly, an object of the present invention is to allow the sheet material to be subjected to opening or stretching treatment in a state where a tensile force in the width direction is applied to the sheet material. An object of the present invention is to provide a sheet material opening or stretching device and a sheet material opening or stretching method that can be formed or greatly stretched.

The present invention includes a first roll having a plurality of protrusions extending in the circumferential direction, and a second roll having a piercing pin or a protrusion inserted between the protrusions of the first roll. Each of the first and second rolls in the axial length direction, on both outer sides of the region having the ridges or the piercing pins, a meshing portion in which convex portions and concave portions are alternately formed in the circumferential direction. The both sides of the sheet material formed between the first roll and the second roll are narrowed between the meshing part of the first roll and the meshing part of the second roll, The object is achieved by providing a sheet material opening or stretching device that is capable of opening or stretching the sheet material.

  The present invention also includes a first roll having a plurality of protrusions extending in the circumferential direction, and a second roll having a perforation pin or a protrusion inserted between the protrusions of the first roll. The sheet material is introduced between the rolls, and both sides of the sheet material are narrowed between the meshing part of the first roll and the meshing part of the second roll which mesh with each other. The object is achieved by providing a method for opening or stretching a sheet material in which the sheet material is subjected to a hole opening or stretching process under a tensile force.

According to the sheet material opening or stretching apparatus of the present invention, the sheet material can be subjected to the opening or stretching process in a state in which a tensile force in the width direction is applied to the sheet material, so that a clear outline can be opened. A hole can be formed or the sheet material can be stretched greatly.
According to the method for opening or stretching a sheet material of the present invention, it is possible to form a clear aperture in the sheet material or to stretch the sheet material greatly.

The present invention will be described below based on preferred embodiments with reference to the drawings.
The apparatus and method according to the first embodiment of the present invention are a sheet material opening device and method for forming holes in a sheet material as shown in FIGS.
As shown in FIGS. 1 to 3, the apparatus 1 of the first embodiment includes a first roll 2 having a plurality of protrusions 21 extending in the circumferential direction, and a protrusion 21 of the first roll 2. , 21 and a second roll 3 having a perforated pin 31 inserted between them.

  As shown in FIG. 2, the ridge portion 21 in the first roll 2 is provided in the central region 2 </ b> A in the axial length direction of the roll 2, and a piercing pin 31 is provided between the adjacent ridge portions 21. A gap that fits in is provided. The ridge portion 21 of the first roll 2 is formed from the peripheral portion of a disc 23 fixed around the rotation shaft 22 of the roll 2, and the gap between the ridge portions 21 is formed between the disc 23 and the disc. It is formed by interposing a spacer 24 between them. An insertion hole for the rotating shaft 22 is formed at the center of the disk 23 and the spacer 24, and the disk 23 and the spacer 24 themselves are formed in an annular shape. The disc 23 and the spacer 24 are overlapped in the axial direction of the rotary shaft 22 and are fixed to the rotary shaft 22 by known fixing means (fastening members or the like) not shown.

The second roll 3 is arranged to face the first roll 2 with the sheet material 4 interposed therebetween.
As shown in FIG. 2, the perforation pins 31 in the second roll 3 are provided in the central region 3 </ b> A in the axial length direction of the roll 3. A large number of perforation pins 31 are arranged in series in the circumferential direction of the second roll 3, and the rows are formed in multiple rows in the axial length direction of the roll 3. Although not shown, the piercing pin 31 is provided by fixing a pin disk in which a large number of piercing pins are formed at regular intervals around the periphery of the rotary shaft 32 of the second roll 3. The pin disk is fixed by interposing a spacer between the pin disks in the same manner as the disk 23 is fixed to the rotating shaft 22 of the first roll.
An insertion hole (not shown) for the cartridge heater is formed in the rotating shaft 32 of the second roll 3 so that the pin disk can be heated appropriately by heating the cartridge heater.

  Engaging portions 2S in which convex portions 2a and concave portions 2b are alternately formed in the circumferential direction on both outer sides of the central region (region having the ridges 21) 2A in the axial length direction of the first roll 2. 2S is formed. Further, in the axial direction of the second roll 3, meshing portions in which convex portions 3 a and concave portions 3 b are alternately formed in the circumferential direction on both outer sides of the central region (region having the perforated pins 31) 3 </ b> A. 3S and 3S are formed. The meshing portion 2S of the first roll 2 and the meshing portion 3S of the second roll 3 are configured to mesh with each other with the sheet material 4 interposed therebetween.

Each meshing portion 2S of the first roll 2 is formed with a plurality of unit meshing portions 25-28 in which convex portions 2a and concave portions 2b are alternately formed in the circumferential direction in the axial length direction of the roll 2. And as shown in FIG.1 and FIG.2, the position of the roll circumferential direction of the convex part 2a and the recessed part 2b in an adjacent unit meshing part differs. More specifically, the positions in the roll circumferential direction of the convex portions and the concave portions in the adjacent unit meshing portions are shifted by a half pitch of the pitch in the roll circumferential direction of the convex portions and the concave portions.
A plurality of unit meshing portions 35 to 38 in which convex portions 3 a and concave portions 3 b are alternately formed in the circumferential direction are formed in each meshing portion 3 </ b> S of the second roll 3 in the axial length direction of the roll 3. Also in the 2nd roll 3, the position of the roll circumferential direction of the convex part and recessed part in the adjacent unit meshing part has shifted | deviated by the half pitch of the pitch of the roll circumferential direction of a convex part and a recessed part.
And the 1st roll 2 and the 2nd roll 3 are made to mesh | engage in the state in which the unit meshing parts in the same position in the axial length direction of both the rolls 2 and 3 interpose the sheet material 4. FIG.

The meshing portions 2S and 2S in the present embodiment have gear-like discs 25 'to 28' in which convex portions 2a and concave portions 2b are alternately formed in the circumferential direction of the outer peripheral surface, respectively, around the shaft portion 22. It is fixed and formed. In each meshing portion 2 </ b> S of the present embodiment, four gear-like discs 25 ′ to 28 ′ are arranged in the axial length direction of the shaft portion 22. Each unit meshing part 25-28 mentioned above is formed from the outer peripheral surface of each gear-like disk 25'-28 '.
Each of the meshing portions 3S and 3S in the present embodiment includes gear-like discs 35 ′ to 38 ′ in which convex portions 3a and concave portions 3b are alternately formed in the circumferential direction of the outer peripheral surface. It is fixed and formed. In each meshing portion 3 </ b> S in the present embodiment, four gear-like discs 35 ′ to 38 ′ are arranged in the axial length direction of the shaft portion 32. Each unit meshing part 35-38 mentioned above is formed from the outer peripheral surface of each gear-like disk 35'-38 '.

A sheet material opening method using the apparatus 1 of the first embodiment described above will be described.
The first and second rolls 2 and 3 are rotated in a direction indicated by an arrow P in FIGS. 1 and 3, and a belt-like sheet material 4 conveyed by a known conveying means is provided between the rotating rolls 2 and 3. Introduce.
In addition, the sheet | seat material 4 uses the width | variety between the both meshing parts 2S and 2S in the axial length direction of both the rolls 2 and 3 and between both the meshing parts 3S and 3S.
In the sheet material 4 introduced between the first and second rolls 2 and 3, the portion introduced between the central region 2 </ b> A of the first roll 2 and the central region 3 </ b> A of the second roll 3 includes the first A large number of three-dimensional openings (penetrations) are caused by pressing by the protrusion 21 of the first roll 2 and the perforation pins 31 of the second roll inserted between the protrusions 21 and 21 of the first roll 2. Hole) 41 is formed.
A mechanism in which a three-dimensional opening (through hole) 41 is formed in the sheet material 4 introduced between the central region 2A of the first roll 2 and the central region 3A of the second roll 3 is disclosed in Patent Literature It is the same as the method or apparatus of 1. The arrangement of the protrusions 21 of the first roll 2 and the perforation pins 31 of the second roll, the relative positional relationship between them, the heating of the perforation pins 31 and the like are not particularly described in detail. It can be similar to the device.

In the present embodiment, both sides in the longitudinal direction of the sheet material 4 introduced between the first and second rolls 2 and 3 are engaged with the meshing portion 2S of the first roll 2 and the meshing portion 3S of the second roll 3. It is narrowed between. A portion of the sheet material 4 which is narrowly pressed between the meshing portions 2S and 3S meshing with each other is deformed into a shape along the uneven shape of the meshing portions 2S and 3S, and the sheet material transport direction (hereinafter also referred to as MD) and The sheet material is stretched in a direction (hereinafter also referred to as a CD direction) perpendicular to the sheet material conveyance direction.
As a result, a tensile force in the CD direction is applied to the sheet 4 at the same time as immediately before or after the piercing pin 31 pierces the sheet material 4 so that the sheet material 4 does not simply move to the center in the width direction. Even when both sides of the sheet material 4 are restrained by a pin tenter or the like, a greater tension is applied to the sheet material 4.
Then, under the high tension state, the piercing pin 31 pierces the sheet material 4 or the piercing pin 31 pierced into the sheet material 4 is extracted.
Thereby, a three-dimensional opening 41 having a clean shape, for example, a three-dimensional opening (through hole) 41 having a clear outline of the opening when viewed in plan, is formed in the sheet material 4.

For the first and second rolls 2 and 3 having the convex portions 2a and 3a and the concave portions 2b and 3b, gears such as spur gears and inclined gears can be used, but involute tooth-shaped spur gears are used in terms of manufacturing cost. Desirably, from the viewpoint of imparting a tensile force in the width direction to the sheet 4, the module range is preferably 0.6 to 20, and more preferably 1 to 10. The engagement distance between the convex portions and the concave portions of the meshing portions 2S and 3S is 2 × M (mm) (where M is a module), for example, 1.2 mm in the module 0.6, and 2. 0 to 20 mm.
Further, the length L (see FIG. 2) of the meshing portions 2S and 3S in the roll axis length direction is a ratio (L / L2) to the length L2 in the same direction of the central region (region having the ridges 21) 2A. ) Is preferably 0.05 or more, more preferably 0.1 to 0.4. Moreover, there is no restriction | limiting in particular about the ratio of the pitch circle diameter of the roll 2 and the roll 3, However, 1: 1 is preferable. The length L of each meshing part 2S, 3S is preferably 5 mm or more, more preferably 10 mm or more.

  As the sheet material 4 to be subjected to the hole opening treatment, various known sheet materials can be used, and examples thereof include nonwoven fabrics, woven fabrics, resin films, nonwoven fabrics or laminates of woven fabrics and resin films by various production methods. It is done. When forming a sheet material having an opening, which is preferably used as a surface sheet of an absorbent article such as a sanitary napkin, disposable diaper, or panty liner, a nonwoven fabric or a laminate of a nonwoven fabric and a resin film is preferably used. . Examples of the nonwoven fabric include an air-through nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, and a needle punched nonwoven fabric obtained by subjecting a heat-bonded fiber web manufactured by the card method to hot air. There is no restriction | limiting in particular in the coupling | bonding means of the fiber in these nonwoven fabrics, For example, the coupling | bonding by a binder and the coupling | bonding by heat sealing | fusion can be used. Further, instead of fiber bonding, mechanical entanglement of fibers such as spunlace nonwoven fabric may be used. From the viewpoint of smooth touch and softness, an air-through nonwoven fabric obtained by subjecting a heat-bonded fiber web obtained by the card method to hot air treatment and forming a nonwoven fabric without giving strong compression is particularly suitable.

Next, an apparatus and method according to a second embodiment of the present invention will be described with reference to FIG.
The apparatus and method of the second embodiment is an apparatus and method for performing a stretching process on the sheet material 4.
As shown in FIG. 4, the apparatus 1 ′ of the second embodiment includes a first roll 2 having a plurality of protrusions 21 extending in the circumferential direction, and protrusions 21 and 21 of the first roll 2. And a second roll 3 having a ridge portion 31 ′ inserted therebetween.
The first roll 2 in the apparatus of the second embodiment has the same configuration as that of the first roll 2 in the first embodiment except that the width between the meshing portions 2S, 2S and the number of the protrusions 21 are different. is doing. The second roll 3 in the apparatus of the second embodiment has a protrusion 31 ′ similar to that in the central area 2 </ b> A of the first roll 2 in place of the perforation pin 31 in the central area 3 </ b> A in the axial direction. Is formed. And in the opposing part of the 1st roll 2 and the 2nd roll 3, the protrusion part 21 of the 1st roll 2 is between two protrusion part 31 ', 31' of the 2nd roll 3. The protrusion 31 ′ of the second roll 3 is inserted between the two protrusions 21, 21 of the first roll 2.
The points that are not particularly described in the second embodiment are the same as those in the first embodiment.

  Similarly to the device of the first embodiment, the device 1 ′ of the second embodiment also has meshing portions 2S on both outer sides of the central region (region having the ridges 21) 2A in the axial length direction of the first roll 2. 2S is formed, and meshing portions 3S and 3S are formed on both outer sides of the central region (region having the protruding portion 31 ′) 3A in the axial length direction of the second roll 3. Further, the meshing portion 2S of the first roll 2 and the meshing portion 3S of the second roll 3 are configured to mesh with each other with the sheet material 4 interposed therebetween.

  In order to stretch the sheet material using the apparatus of the second embodiment, the first and second rolls 2 and 3 are rotated, and a belt-like sheet conveyed between the rotating rolls 2 and 3 by a known conveying means. Material 4 is introduced. Thereby, the part introduce | transduced between the center area | region 2A of the 1st roll 2 and the center area | region 3A of the 2nd roll 3 in the sheet | seat material 4 is the protrusion parts 21 and 31 'of both rolls 2 and 3. Due to the mutual pushing action of the sheet material 4, the cross-sectional shape in the width direction of the sheet material 4 is deformed into a corrugated or zigzag shape as shown in FIG. 4, so that the sheet 4 is in the width direction (same as the CD direction). Stretched. During the stretching, both sides of the sheet material 4 are narrowed between the meshing portion 2S of the first roll 2 and the meshing portion 3S of the second roll 3. As a result, a tensile force in the width direction is applied to the sheet material 4, and a larger tension than when the both sides of the sheet material 4 are restrained by a pin tenter or the like so that the sheet material 4 does not simply move to the center in the width direction. Is added to the sheet material 4. Therefore, the sheet material 4 can be extended greatly efficiently.

  As the sheet material to be stretched by the apparatus or method of the present invention, a non-elastic fiber web, an elastic fiber web and an elastic fiber web are laminated in this order, and these are formed in the thickness direction by embossing or air-through hot air treatment. An integrated laminated nonwoven fabric and the like can be mentioned. Such a laminated nonwoven fabric can be stretched in the width direction to elongate the inelastic fiber web, thereby obtaining a laminated nonwoven fabric rich in stretchability as a whole.

  The elastic fiber layer in the laminated nonwoven fabric is an aggregate of fibers having elasticity. The elastic fiber forming method includes, for example, a melt blown method in which a molten resin is extruded from a nozzle hole, and the extruded molten resin is elongated by hot air to thin the fiber, and a semi-molten resin is cooled by cold air. There is a spunbond method in which stretching is performed by a mechanical draw ratio. As a special method of the melt blown method, there is a spinning blow method in which the spun bond method is combined with the melt blown method. The elastic fiber layer may be in the form of a web or a nonwoven fabric made of elastic fibers. For example, it may be a web or a non-woven fabric formed by a spinning blow method, a spun bond method, a melt blow method, or the like. Particularly preferred is a web obtained by the spinning blow method. As the constituent fiber of the elastic fiber layer, for example, a fiber made of thermoplastic elastomer, rubber or the like can be used. In particular, fibers made from thermoplastic elastomers can be melt-spun using an extruder in the same way as ordinary thermoplastic resins, and the fibers thus obtained are easily heat-sealed. Is suitable for the stretchable nonwoven fabric of this embodiment. Examples of the thermoplastic elastomer include styrene elastomers such as SBS, SIS, SEBS, and SEPS, olefin elastomers, polyester elastomers, and polyurethane elastomers. These can be used individually by 1 type or in combination of 2 or more types.

  The inelastic fiber layer in the laminated nonwoven fabric has extensibility, but is substantially inelastic. The stretchability here refers to the case where the constituent fibers themselves are stretched, and even if the constituent fibers themselves are not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are thermally fused. The three-dimensional structure formed by a plurality of fibers may be structurally changed due to wearing or the like, and the constituent fibers may be broken, and the whole fiber layer may be elongated. Examples of the fibers constituting the inelastic fiber layer include fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, and the like. The fibers constituting the inelastic fiber layer are preferably short fibers and preferably have water repellency. Moreover, a core-sheath type or side-by-side type composite fiber, a split fiber, a modified cross-section fiber, a crimped fiber, a heat-shrinkable fiber, or the like can be used. These fibers can be used singly or in combination of two or more. The inelastic fiber layer can be a continuous filament or short fiber web or nonwoven.

  The sheet material stretched by the apparatus or method of the present invention is not limited to the above laminated nonwoven fabric, and may be a nonwoven fabric, a woven fabric, a nonwoven fabric, a laminate of a woven fabric and a resin film, a resin film, or the like by various manufacturing methods.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, the opening or extending | stretching apparatus of the sheet | seat material of this invention is not restrict | limited to said each embodiment, A various change is possible.
For example, the meshing portions 21 and 31 of the first and second rolls 2 and 3 in the above-described embodiment are each composed of four unit meshing portions, but two, three, or five or more It may consist of a unit meshing part. Further, the adjacent unit meshing portions in the plurality of unit meshing portions are such that the positions of the convex portions and the concave portions in the roll circumferential direction are half the pitch of the convex portions and the concave portions in the roll circumferential direction, 1/5 pitch, etc. An angle other than the pitch may be shifted. However, a half-pitch deviation is preferable from the viewpoint of applying a large tensile force to the sheet material 4.
Further, as shown in FIG. 5, the meshing portions 21 and 31 of the first and second rolls 2 and 3 are formed by arranging convex portions a and concave portions b in a row in the roll circumferential direction. What is not divided | segmented into a part may be sufficient. In this case, the portion of the sheet material 4 that is narrowly pressed between the meshing portions 2S and 3S that mesh with each other changes the cross-sectional shape in the MD direction and extends directly in the MD direction. Due to the contraction in the CD direction accompanying the extension, a force pulling in the width direction is applied to a portion located between the central regions 2A and 3A of the first and second rolls.

It is a perspective view which shows the opening apparatus of the sheet | seat material which concerns on 1st Embodiment of this invention. It is the figure which looked at the 1st and 2nd roll of the apparatus shown in FIG. 1 from the derivation | leading-out side of the sheet | seat. It is the II-II sectional view taken on the line of FIG. It is a figure (drawing 2 equivalent figure) which shows the extending | stretching apparatus of the sheet material which concerns on 2nd Embodiment of this invention. It is a figure (figure 2 equivalent figure) which shows other embodiment of this invention.

Explanation of symbols

1, 1 'Sheet material opening or stretching device 2 First roll 21 ridge 3 Third roll 31 Perforated pin 31' ridge 4 Sheet material 41 Opening

Claims (4)

  A first roll having a plurality of protrusions each extending in the circumferential direction, and a second roll having a perforation pin or a protrusion inserted between the protrusions of the first roll, Engagement portions in which convex portions and concave portions are alternately formed in the circumferential direction are formed on both outer sides of the regions having the protrusions or the piercing pins in the axial length direction of each of the first and second rolls. The both sides of the sheet material introduced between the first roll and the second roll are narrowed between the meshing part of the first roll and the meshing part of the second roll, A sheet material opening or stretching apparatus configured to be capable of performing an opening or stretching process.   Each of the meshing portions of each of the first and second rolls is formed with a plurality of unit meshing portions in which convex portions and concave portions are alternately formed in the circumferential direction in the axial length direction of each roll. The sheet material opening or stretching device according to claim 1, wherein positions of the convex portion and the concave portion in the roll circumferential direction are different.   The hole of the sheet | seat material of Claim 2 in which the position of the roll circumferential direction of the said convex part and the said recessed part in the adjacent unit meshing part has shifted | deviated by the half pitch of the pitch of the roll circumferential direction of the said convex part or the said recessed part. Or a stretching device. A sheet between a first roll having a plurality of protrusions extending in the circumferential direction and a second roll having a piercing pin or a protrusion inserted between the protrusions of the first roll. The material is introduced, and both sides of the sheet material are tightly pressed between the meshing portion of the first roll and the meshing portion of the second roll that mesh with each other, and a tensile force in the width direction is applied to the sheet material Below, a method for opening or stretching a sheet material, in which the sheet material is subjected to opening or stretching treatment.

Images