JP5377363B2 - Band processing apparatus and method - Google Patents

Abstract

A production apparatus (20) is equipped with a slit-forming roller (21), a transfer roller (22), and an anvil roller (23) which is positioned facing both the slit-forming roller and the transfer roller. A cover sheet web (W8) is conveyed so as to pass through a slit-forming position (PS) between the slit-forming roller (21) and the anvil roller (23), and then pass through a transfer position (PT) between the transfer roller (22) and the anvil roller (23). The slit-forming roller (21) intermittently forms a plurality of slits in the direction of conveyance in the cover sheet web (W8) at the slit-forming position (PS). The transfer roller (22) intermittently transfers release sheet pieces (12), so as to span the slits, onto the cover sheet web (W8) at the transfer position (PT).

Description

  The present invention relates to a strip processing apparatus and method.

  A cutter roll, an anvil roll arranged to face the cutter roll, and a nip roll arranged to face the anvil roll are provided, and a continuous sheet is supplied between the cutter roll and the anvil roll, and the cutter roll intermittently interrupts the continuous sheet. Is cut to form a release sheet piece, and the strip is conveyed so as to pass through the transfer position between the anvil roll and the nip roll, and the anvil roll transports the release sheet piece to the transfer position and then intermittently to the strip. There is known an intermittent cutting transfer device for transferring to a sheet (see Patent Document 1).

  On the other hand, the liquid-permeable top sheet, the liquid-impermeable back sheet, and the absorbent main body including the absorbent body arranged between the top sheet and the back sheet, and attached to the absorbent main body so as to cover the top sheet A cover sheet having a slit for partitioning a pair of flaps for fixing the absorbent main body to clothing, an adhesive provided on the outer surface of the cover sheet, and straddling the slit In addition, an absorbent article including a release sheet piece that covers the pressure-sensitive adhesive is also known (see Patent Document 2).

Japanese National Patent Publication No. 9-512454 Japanese Patent Laid-Open No. 10-218471

  When actually manufacturing the absorbent article disclosed in Patent Document 2, for example, slits are intermittently formed in the cover sheet web that is a continuous body of the cover sheet, and then the release sheet piece to which the adhesive is applied, A process of intermittently transferring to the cover sheet web so as to straddle the slit can be considered.

  In this case, if the slit is previously formed in the cover sheet web and the cover sheet web with the slit is considered as a belt-like body in Patent Document 2, it appears that the above process can be easily realized.

  However, if a slit is formed on the cover sheet web, there is a possibility that a crease or wrinkle may be formed on the cover sheet web around the slit in the transport path up to the transfer position. When the release sheet piece is transferred to the cover sheet web having a meklet or wrinkle, it becomes very difficult to eliminate the meklet or wrinkle.

  According to the present invention, there is provided a strip processing apparatus for intermittently forming slits in strips and intermittently transferring sheet pieces to the strips, including a slit forming roll, a transfer roll, and these slit forming rolls And the anvil roll disposed facing each other on the transfer roll, and the strip passes through the slit forming position between the slit forming roll and the anvil roll and then passes through the transfer position between the transfer roll and the anvil roll. The slit forming roll intermittently forms a plurality of slits in the belt-like body in the carrying direction at the slit forming position, and the transfer roll strips the sheet pieces so as to straddle the slits at the transfer position, respectively. A belt-like body processing apparatus is provided which intermittently transfers to a belt.

  Further, according to the present invention, there is provided a strip processing method for intermittently forming slits in strips and intermittently transferring sheet pieces to the strips, comprising a slit forming roll, a transfer roll, and these slits An anvil roll disposed facing each of the forming roll and the transfer roll, and the strips passed through the slit forming positions between the slit forming roll and the anvil roll disposed facing each other, and then disposed facing each other. It is conveyed so as to pass through the transfer position between the transfer roll and the anvil roll, and at the slit forming position, a plurality of slits are intermittently formed in the belt-like body by the slit forming roll, and then at the transfer position, Provided is a strip processing method in which a sheet piece is intermittently transferred to a strip by a transfer roll so as to straddle each slit. .

  It is possible to transfer the sheet piece while suppressing the formation of creases or wrinkles on the band-like object on which the slit is formed.

It is a front view of an absorptive article. FIG. 2 is a schematic cross-sectional view of the absorbent article taken along line II-II in FIG. 1. It is a front view of an absorptive article which developed a flap. It is the schematic which shows the manufacturing process of an absorbent article. It is the schematic of the manufacturing apparatus of a cover sheet complex. It is the schematic explaining the drive system of a manufacturing apparatus. It is a schematic diagram of the surrounding surface of an anvil roll. It is a figure which shows typically the manufacturing process of the cover sheet composite body C8 in a manufacturing apparatus.

  With reference to FIGS. 1 and 2, an absorbent article 1 such as a sanitary napkin, panty liner, incontinence pad comprises an absorbent body 2. The absorbent main body 2 includes a liquid-permeable top sheet 3, a liquid-impermeable back sheet 4, and a liquid-retaining absorbent 5 disposed between the top sheet 3 and the back sheet 4. To do. The top sheet 3 and the back sheet 4 have substantially the same size, and are joined and sealed to each other at the peripheral portion 2P by heat sealing, hot melt adhesive, or the like. Further, an adhesive 6 for fixing the absorbent main body 2 to the underwear is applied to the outer surface of the back sheet 4 that is directed to clothing such as underwear during use, and this adhesive 6 is covered with a release sheet piece 7. ing.

  In FIG. 1, 2F, 2B, 2L, and 2R indicate the front edge, the rear edge, the left edge, and the right edge of the napkin 1 or the absorbent main body 2, respectively. The front, rear, left and right in this case correspond to the front, back, left and right of the wearer's body. In FIG. 2, 5 </ b> A indicates a tissue disposed between the absorbent body 5 and the back sheet 3.

  The surface of the top sheet 3 that contacts the wearer during use is covered with a liquid-impermeable cover sheet 8. The cover sheet 8 is approximately the same size as the absorbent main body 2, and thus covers almost the entire surface of the top sheet 3. Further, the cover sheet 8 is joined to the top sheet 3 or the absorbent main body 2 by heat sealing, hot melt adhesive, or the like in the annular peripheral region 8P. On the other hand, the central region 8C, which is a region other than the peripheral region 8P, is not joined to the top sheet 3.

  A slit 9 is formed in the central region 8C of the cover sheet 8 in advance, and a plurality of flaps for fixing the absorbent main body 2 to the underwear are defined or formed in the central region 8C by the slit 9.

  Here, the slit 9 is formed from a cutting line that completely cuts the cover sheet 8. However, the slit 9 can also be formed from a weak line such as a perforation.

  In the example shown in FIG. 1, the slit 9 includes a U-shaped curved portion 9 </ b> F that expands toward the front edge 2 </ b> F, a U-shaped curved portion 9 </ b> B that expands toward the rear edge 2 </ b> B, and substantially the cover sheet 8. It is composed of a straight line portion 9S that connects the vertices of these curved portions 9F and 9B at the center. As a result, four flaps, that is, a semi-oval front flap 10F and a rear flap 10B, and a trapezoidal left flap 10L and a right flap 10R are defined in the central region 8C. In this case, the front and rear flaps 10F and 10B are positioned symmetrically with each other, and the left and right flaps 10L and 10R are also positioned symmetrically with each other.

  Here, it can be seen that the slit 9 branches into three at the connection point between the curved portions 9F and 9B and the straight portion 9S. That is, the slit 9 includes a branch portion 9D.

  Adhesives 11 for fixing the corresponding flaps 10F, 10B, 10L, and 10R to the underwear are applied to the outer surfaces of the flaps 10F, 10B, 10L, and 10R, respectively. These adhesives 11 are covered with a common release sheet piece 12.

  In this case, the release sheet piece 12 is provided so as to straddle the slit 9, and particularly provided so as to cover the branch portion 9D. If it does in this way, it can suppress reliably that a bullet etc. arise in flap 10F, 10B, 10L, 10R.

  Next, the material of each element will be described.

  The top sheet 3 is composed of, for example, a perforated or non-porous nonwoven fabric or a porous plastic sheet.

  The back sheet 4 is composed of, for example, a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, a highly water-resistant melt-blown nonwoven fabric, and an SMS nonwoven fabric sandwiched between strong spunbond nonwoven fabrics. The

  The absorbent body 5 is composed of, for example, fluffy pulp or air laid nonwoven fabric and a highly absorbent polymer. Here, the fluffy pulp is composed of, for example, artificial cellulose fibers such as chemical pulp, cellulose fiber, rayon, and acetate, and the airlaid nonwoven fabric is composed of, for example, a nonwoven fabric in which pulp and synthetic fibers are thermally fused or fixed with a binder. The superabsorbent polymer is composed of, for example, a starch-based, acrylic acid-based, or amino acid-based particulate or fibrous polymer.

  Adhesives 6 and 11 are hot melts such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-ethylene copolymer (SEBS), etc. Consists of an adhesive.

The cover sheet 8 is composed of, for example, a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, a highly water-resistant meltblown nonwoven fabric, and an SMS nonwoven fabric sandwiched between strong spunbond nonwoven fabrics. Preferably, it is composed of a hydrophobic nonwoven fabric. The basis weight of the cover sheet 8 is preferably 15 g / m ² to 60 g / m ² . When composed of a plastic film, the draping property of the plastic film is preferably 20 mm to 100 mm, more preferably 30 mm to 70 mm by the cantilever method. This is because if the drapeability is smaller than 20 mm, the cover sheet 8 is easily twisted. On the other hand, if the drapeability is larger than 100 mm, the cover sheet 8 becomes hard, so there is a possibility that the feeling of use of the napkin 1 may be deteriorated, and the followability to the underwear may be lowered and the liquid to be absorbed may leak. is there.

  In addition, the above-mentioned cantilever method is performed as follows according to JIS-L1018. That is, a measurement sample is obtained by stacking five measurement objects having a length of 150 mm and a width of 25 mm. Next, using a cantilever manufactured by Daiei Scientific Instruments Co., Ltd., the measurement sample is sandwiched under the holding plate of the cantilever and slid in the slope direction to automatically measure the moving distance at a speed of 5 mm / sec. Measurement is performed both when the surface of the measurement sample is down and when the back surface of the measurement sample is down, and the average of these is taken as the measurement result.

  Now, the absorbent article 1 is fixed to the underwear as follows. That is, first, the release sheet piece 7 on the back sheet 4 side is removed, and the absorbent article 1 or the absorbent main body 2 is fixed to the underwear via the adhesive 6. At this time, since the top sheet 3 is covered with the cover sheet 8, the top sheet 3 is prevented from being contaminated.

  Next, as shown in FIG. 3, these flaps 10F, 10B, 10L, and 10R are expanded. That is, the front flap 10F is folded in the folding region 14F along the front edge 2F and expanded in the forward direction, and the rear flap 10B is folded in the folding region 14B along the rear edge 2B and expanded in the rear direction. Further, the left flap 10L is folded in the folding region 14L along the left edge 2L and expanded leftward, and the right flap 10R is folded in the folding region 14R along the right edge 2R and expanded rightward. As a result, the top sheet 3 is exposed.

  Next, the flaps 10F, 10B, 10L, and 10R are fixed to the underwear via the respective adhesives 11. That is, the front flap 10F and the rear flap 10B are fixed to the inner surface of the underwear, and the left flap 10L and the right flap 10R are fixed to the outer surface of the underwear below the absorbent article 1, respectively.

  As a result, even if external forces in various directions act on the absorbent main body 2, it is possible to suppress twisting and displacement of the absorbent main body 2. That is, the absorptive main body 2 can be reliably fixed to the underwear, and therefore leakage of the liquid to be absorbed can be suppressed. Moreover, the wearer's anxiety about leakage can be eliminated.

  FIG. 4 schematically shows a manufacturing process of the absorbent article 1.

  Referring to FIG. 4, a tissue web W5A, which is a continuous body of tissue 5A, is conveyed in the conveyance direction MD, and the absorbent body 5 is intermittently arranged on the tissue web W5A, that is, spaced in the conveyance direction MD. (S1). An adhesive such as a hot melt adhesive is applied in advance to the upper surface of the tissue web W5A (S1A), and the absorbent body 5 is fixed to the tissue web W5A by this adhesive. Next, a top sheet web W3, which is a continuous body of the top sheet 3, is superimposed on the absorbent body 5 (S2). An adhesive is applied in advance to the inner surface of the top sheet web W3, that is, the surface facing the absorber 5 (S2A), and the top sheet web W3 is fixed to the absorber 5 by this adhesive.

  Next, the cover sheet composite C8 is overlaid on the outer surface of the top sheet web W3 (S3). The cover sheet composite C8 is obtained by intermittently providing an adhesive 11 and a release sheet piece 12 on a cover sheet web W8 that is a continuous body of the cover sheet 8.

  Further, the back sheet composite C4 is overlaid on the lower surface of the tissue web W5A (S4). The backsheet composite C4 is obtained by intermittently providing the adhesive 6 and the release sheet pieces 7 on the backsheet web that is a continuous body of the backsheet 4. An adhesive is applied in advance to the bottom surface of the tissue web W5A, that is, the surface facing the backsheet composite C4 (S4A), and the backsheet composite C4 is fixed to the tissue web W5A by this adhesive.

  Next, the entire periphery of the absorbent body 5 is sealed to form a seal portion S (S5). Next, the seal portion S is cut along the orthogonal direction orthogonal to the conveyance direction MD (S6), and thus the absorbent article 1 is completed.

  FIG. 5 shows a manufacturing apparatus 20 for the cover sheet composite C8. In this manufacturing apparatus 20, slits 9 are formed in a belt-like object, for example, a cover sheet web W 8 at intervals in the conveying direction MD, and the release sheet piece 12 is transferred to the cover sheet web W 8 so as to straddle the slit 9, thereby covering A sheet composite C8 is formed. Further, in the example shown in FIG. 5, the continuous sheet W12 that is a continuous body of the release sheet pieces 12 is intermittently cut, thereby forming the release sheet pieces 12, and then intermittently transferred to the cover sheet web W8. The Here, the adhesive 11 is applied in advance to the continuous sheet W12, and therefore the release sheet piece 12 is transferred to the cover sheet web W8 together with the adhesive 11.

  Referring to FIG. 5, the manufacturing apparatus 20 is disposed to face the slit forming roll 21, the transfer roll 22, the anvil roll 23 arranged to face the slit forming roll 21 and the transfer roll 22, and the transfer roll 22. And a cutter roll 24. The rotation axes of these rolls 21, 22, 23, and 24 are parallel to each other. In the example shown in FIG. 5, the slit forming roll 21 and the anvil roll 23 are rotatably supported by the frame 25, and the transfer roll 22 and the cutter roll 24 are rotatably supported by the frame 26.

  The slit forming roll 21, the transfer roll 22, the anvil roll 23, and the cutter roll 24 are rotationally driven by the same driving machine. That is, as shown in FIG. 6, the driving force of the driving device 27 such as a servo motor is transmitted to the infinite belt V <b> 2 via the infinite belt V <b> 1 and the common pulley 28. The infinite belt V2 is hung around the pulley 23P of the anvil roll 23 and around the pulley 22P of the transfer roll 22, so that the anvil roll 23 and the transfer roll 22 are rotationally driven by the infinite belt V2.

  Here, the slit forming roll 21 and the anvil roll 23 are connected to each other by a gear (not shown), and the transfer roll 22 and the cutter roll 24 are also connected to each other by a gear (not shown). Therefore, the four rolls 21, 22, 23, and 24 are rotationally driven by the same driving machine 27.

  In this case, the slit forming roll 21 and the anvil roll 23 are rotated in opposite directions, the transfer roll 22 and the cutter roll 24 are rotated in opposite directions, and the transfer roll 22 and the anvil roll 23 are rotated in opposite directions. In FIG. 6, PI indicates an idler pulley.

  Referring to FIG. 5 again, the cover sheet web W8 rewound from the roll-shaped cover sheet web source R8 is formed with a slit between the slit forming roll 21 and the anvil roll 23 by the transport roll RF8 and the idle roll RI. It is conveyed to position PS.

  A negative pressure is applied to the peripheral surface of the anvil roll 23 through a pressure port 23P as shown in FIG. 7, so that when the anvil roll 23 is reached, the cover sheet web W8 is held on the peripheral surface of the anvil roll 23. Is done.

  At the subsequent slit forming position PS, the slit 9 is intermittently formed in the cover sheet web W8 by the blade 21A of the slit forming roll 21 and the peripheral surface of the anvil roll 23 acting as a receiving blade. In this case, since the slit 9 is formed while the cover sheet web W8 is held by the anvil roll 23, the slit 9 can be formed accurately. In addition, as FIG. 7 shows, the pressure port 23P is arrange | positioned so that it may not interfere with the blade 21A of the slit formation roll 21. FIG. The cover sheet web W8 in which the slit 9 is formed is conveyed to the transfer position PT while being held by the anvil roll 23.

  On the other hand, the continuous sheet W12 rewound from the continuous sheet source R12 in the form of a roll is supplied to the cutting position PC between the transfer roll 22 and the cutter roll 24 by the transport roll RF12. Here, the adhesive is intermittently applied to the continuous sheet W12 by the adhesive applicator 30 before reaching the cutting position PC.

  A negative pressure is also applied to the peripheral surface of the transfer roll 22 via the pressure port. Therefore, when reaching the transfer roll 22, the continuous sheet W <b> 12 is held on the peripheral surface of the transfer roll 22.

  At the subsequent cutting position PC, the continuous sheet W12 is intermittently cut by the blade 24A of the cutter roll 24 and the peripheral surface of the transfer roll 22 acting as a receiving blade, and thus the release sheet piece 12 is formed. Also in this case, since the continuous sheet W12 is held by the transfer roll 22, the release sheet piece 12 can be accurately formed.

  The release sheet piece 12 thus formed is conveyed to the transfer position PT while being held by the transfer roll 22. In this case, the rotation speed or conveyance speed of the transfer roll 22 is set to be higher than the supply speed of the continuous sheet W12 up to the cutting position PC, and as a result, the release sheet piece 12 is conveyed in the conveyance direction with respect to the subsequent continuous sheet W12. It will be separated from the MD. In this way, the release sheet piece 12 is intermittently transferred to the cover sheet web W8. Considering the supply speed of the continuous sheet W12 and the conveyance speed of the transfer roll 22, the continuous sheet W12 before being cut is held by the transfer roll 22 while sliding with respect to the transfer roll 22.

  At the transfer position PT, the release sheet piece 12 is transferred from the transfer roll 22 to the cover sheet web W8, and thus a cover sheet composite C8 is formed. In this case, the release sheet piece 12 is transferred to the cover sheet web W8 so that the adhesive faces the cover sheet web W8 and straddles the slit 9. Since the release sheet piece 12 is transferred while the cover sheet web W8 is held by the anvil roll 23 at the transfer position PT, the release sheet piece 12 can be accurately positioned with respect to the cover sheet web W8 or the slit 9. A positive pressure is applied to the pressure port of the transfer roll 22 so that the release sheet piece 12 is easily transferred to the cover sheet web W8.

  Next, the cover sheet composite C8 leaves the transfer roll 22 and the anvil roll 23 and is conveyed to the next process.

  Thus, since the slit forming position PS and the transfer position PT are provided on the same anvil roll 23, the conveyance distance of the cover sheet web W8 from the slit forming position PS to the transfer position PT can be shortened. . As a result, it is possible to reliably suppress the formation of wrinkles or wrinkles on the cover sheet web W8.

  That is, when the cover sheet web W8 with the slits 9 formed thereon is transported over a long distance, the risk that a crease or the like is formed during the transport increases. On the other hand, in the embodiment according to the present invention, the slit 9 is formed on the same anvil roll 23, and the release sheet piece 12 is transferred to the cover sheet web W8 so as to straddle the slit 9, so that a meklet or the like is formed. Risk can be greatly reduced.

  For this reason, as shown in FIG. 8, the transport distance L of the cover sheet web W8 from the slit formation position PS to the transfer position PT is preferably set to be equal to or less than the pitch SP at which the slits 9 are formed.

  In addition, when the cover sheet web W8 with the slits 9 formed therein is transferred from the anvil roll 23 to another roll, there is a risk that the cover sheet web W8 may be damaged during the transfer. Further, when the slit 9 includes a portion extending in the direction crossing the conveyance direction MD, particularly when the slit 9 includes the branching portion 9D (FIG. 1), the risk of occurrence of a melee or the like is further increased. However, in the embodiment according to the present invention, since the release sheet piece 12 is transferred on the anvil roll 23 so as to cover the branching portion 9D, the occurrence of peeling can be further suppressed.

  In addition, as described with reference to FIG. 6, the four rolls 21, 22, 23, and 24 are driven by the same driver 27. As a result, it is possible to easily synchronize the rotation of the four rolls, and thus to suppress positional deviation between members.

  In the embodiment described so far, the cutter roll 24 is provided, and the continuous sheet W12 is cut at the cutting position PC between the transfer roll 22 and the cutter roll 24 to form the release sheet piece 12. However, the cutter roll 24 can be omitted. That is, the release sheet piece 12 formed in advance may be intermittently supplied to the transfer roll 22 and transferred to the cover sheet web W8.

  Further, the slit 9 may have any shape. However, when the slit 9 has a shape that forms a cutout in the cover sheet web W8, the negative pressure holding action of the anvil roll 23 is weakened, which is not preferable. That is, the slit 9 preferably has a shape that does not form a cutout.

DESCRIPTION OF SYMBOLS 1 Absorbent article 8 Cover sheet 9 Slit 12 Release sheet piece 21 Slit forming roll 22 Transfer roll 23 Anvil roll

Claims (8)

A strip processing apparatus that intermittently forms slits in a strip and transfers a sheet piece intermittently to the strip,
Comprising a slit forming roll, a transfer roll, and an anvil roll disposed facing each of the slit forming roll and the transfer roll,
The belt-like body is conveyed so as to pass through the slit forming position between the slit forming roll and the anvil roll and then through the transfer position between the transfer roll and the anvil roll,
The slit forming roll intermittently forms a plurality of slits in the belt-like body in the conveying direction at the slit forming position,
The transfer roll, at the transfer position, intermittently transfers the sheet piece to the strip so as to straddle the slits,
Band processing device.   The strip processing apparatus according to claim 1, wherein a strip transport distance from the slit forming position to the transfer position is equal to or less than a pitch of the slit.   A cutter roll disposed facing the transfer roll is further provided, and the continuous sheet is supplied to a cutting position between the transfer roll and the cutter roll. The cutter roll intermittently cuts the continuous sheet at the cutting position. 3. A sheet piece is formed, and the transfer roll conveys the formed sheet piece to a transfer position at a conveyance speed higher than a supply speed of a continuous sheet, and then intermittently transfers the sheet piece to a strip. The strip | belt-shaped body processing apparatus as described in.   4. The sheet according to claim 1, wherein a slit is formed on the belt-like body by the slit-forming roll and a sheet piece is transferred by the transfer roll while the belt-like body is held by the anvil roll with a negative pressure. The strip processing apparatus according to one item.   The strip-shaped body processing apparatus according to any one of claims 1 to 4, wherein the slit forming roll, the transfer roll, and the anvil roll are rotationally driven by the same driving machine.   The strip-shaped body processing apparatus according to any one of claims 1 to 5, wherein the slit includes branch portions, and the sheet piece is transferred to the strip body so as to cover the branch portions.   The said strip | belt body is comprised from the continuous body of the cover sheet which covers the top sheet of an absorbent article, The said sheet piece is comprised from the peeling sheet piece which covers the adhesive on a cover sheet, From 1 to 6. The strip | belt-shaped body processing apparatus as described in any one. A strip processing method of intermittently forming slits in a strip and transferring a sheet piece intermittently to the strip,
Comprising a slit forming roll, a transfer roll, and an anvil roll disposed facing each of the slit forming roll and the transfer roll,
The belt-like body passes through the slit forming position between the slit-forming roll and the anvil roll arranged to face each other, and then passes through the transfer position between the transfer roll and the anvil roll arranged to face each other,
At the slit forming position, the slit forming roll intermittently forms a plurality of slits in the belt-like body,
Next, at the transfer position, the sheet piece is intermittently transferred to the strip so as to straddle the slits by the transfer roll,
Band processing method.

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