WO2011043228A1 - 柔軟性シートの製造方法 - Google Patents
柔軟性シートの製造方法 Download PDFInfo
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- WO2011043228A1 WO2011043228A1 PCT/JP2010/066888 JP2010066888W WO2011043228A1 WO 2011043228 A1 WO2011043228 A1 WO 2011043228A1 JP 2010066888 W JP2010066888 W JP 2010066888W WO 2011043228 A1 WO2011043228 A1 WO 2011043228A1
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- rolls
- sheet
- base sheet
- pair
- tooth
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
- D06C3/06—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by rotary disc, roller, or like apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/18—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets by squeezing between surfaces, e.g. rollers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
Definitions
- the present invention relates to a method for producing a flexible sheet.
- Patent Document 1 proposes a technique for stretching a sheet such as a nonwoven fabric by adjusting the degree of meshing of tooth spaces (gears).
- Patent Document 2 in addition to adjusting the degree of meshing of the tooth gap (gear), before stretching by the tooth groove (gear), a sheet such as a non-woven fabric is stretched in advance by a stretching roll to perform processing with a high stretching ratio. Techniques to apply have been proposed.
- the present invention relates to a method for producing a flexible sheet that is difficult to shrink the width of the sheet, has high flexibility, and is excellent in touch.
- the present invention supplies a base sheet from a pair of first drive rolls to a meshing portion of a pair of tooth groove rolls that mesh with each other, and stretches the base sheet in the flow direction between the pair of tooth groove rolls.
- seat which comprises an extending process is provided.
- the present invention also provides a method for manufacturing a flexible sheet in which the relationship between the peripheral speed V1 of the first drive roll and the peripheral speed V2 of the tooth gap roll is V1> V2.
- FIG. 1 is a diagram schematically showing an embodiment of a sheet processing means used in the sheet manufacturing method of the present invention and a sheet manufacturing process using the same.
- FIG. 2 is a partially enlarged view of a pair of rolls in the processing means shown in FIG.
- FIG. 3 is a diagram schematically illustrating a state in which the base sheet is stretched between a pair of rolls in the processing unit illustrated in FIG. 1.
- FIG. 1 to 3 schematically show an embodiment of processing means (hereinafter also simply referred to as processing means) used in the method for producing a flexible sheet of the present invention.
- the processing means 1 of the present embodiment includes a pair of tooth groove rolls 2 and 3 provided on a peripheral surface portion so that tooth grooves engaged with each other are along the rotation axis direction.
- the tooth gap rolls 2 and 3 are composed of rolls of the same form.
- the tooth groove that meshes with the tooth groove rolls 2 and 3 is provided on the peripheral surface portion along the rotation axis direction.
- 30 is provided on the peripheral surface portion so that the directions extending on the tooth gap rolls 2 and 3 are parallel to each other, and the teeth 20 and the teeth 20 or the teeth 30 and the teeth 30 are formed as grooves. Then, it means that the tooth
- the tooth gap rolls 2 and 3 exhibit an improvement effect such as high flexibility on the base sheet 10, and the base sheet 10 is stretched at a draw ratio of 1.1 to 5 from the viewpoint of maintaining the strength of the base sheet 11 after stretching.
- the drawing process is preferably 0 times, and more preferably 1.5 to 3.0 times.
- the draw ratio of the drawing process is obtained by the following formula 1 based on the pitch P between adjacent teeth 20 and 30 and the meshing depth D of the teeth 20 and 30 of the tooth gap rolls 2 and 3 shown in FIG.
- the pitch P between adjacent teeth 20 and 30 in each of the tooth gap rolls 2 and 3 is preferably 1.0 mm to 5.0 mm, and each tooth 20 30 is preferably less than 0.5 times the pitch, and the height H of the teeth 20 and 30 is preferably equal to or greater than the pitch of adjacent teeth.
- the pitch P between adjacent teeth in the tooth gap roll refers to the distance between the center line of one tooth and the center line of an adjacent tooth.
- the tooth width of the tooth gap roll refers to the width of one tooth.
- the width of the teeth is not uniform, and a trapezoidal tooth that narrows from the root of the tooth toward the tip of the tooth may be used.
- the tooth height of the width crevice roll at the root means the length from the root of the tooth to the tip.
- the pitch P between adjacent teeth in each of the tooth gap rolls 2 and 3 is more preferably 1.5 to 3.5 mm and particularly preferably 2.0 to 3.0 mm in view of uniform elongation.
- the width T1 at the root of each tooth groove roll 2 and 3 is preferably 0.25 to less than 0.5 times the pitch P between teeth in consideration of the strength of the teeth, 0.3 times More preferably, it is more than 0.4 times.
- the tooth height H of each tooth gap roll is preferably 1.0 to 2.0 times the tooth pitch P in consideration of increasing the draw ratio in order to give flexibility to the material. 1.25 times to 1.75 times is more preferable.
- the width T1 at the root of each tooth in the tooth gap rolls 2 and 3 is preferably in the above-described range, and the width T2 at the tooth tip in each tooth groove roll 2 and 3 is Considering the strength of the teeth, it is preferably 0.2 times to 0.45 times the pitch P between the teeth.
- the corners of the tips of the teeth 20 and 30 in each of the tooth gap rolls 2 and 3 are chamfered so that the base sheet 10 is not damaged at the corners.
- the radius of curvature of chamfering is preferably 0.1 to 0.3 mm.
- the value of width T2 of each tooth gap roll 2 and 3 mentioned above is a value before chamfering.
- the engagement depth D of the teeth 20 and 30 of the tooth gap rolls 2 and 3 shown in FIG. 2 is preferably 1.0 mm or more when the pitch P is in the above range, considering that the material has excellent flexibility. 2.0 mm or more is more preferable. From the same point of view, the meshing depth D is preferably equal to or greater than the tooth pitch P.
- the tooth engagement depth D refers to the length of the adjacent teeth 20, 30 overlapping when the tooth gap rolls 2, 3 are engaged and rotated.
- the tooth gap rolls 2 and 3 rotate in a so-called rotating state in which they are meshed and rotated when a driving force from a driving means (not shown) is transmitted to one of the rotating shafts.
- a general gear defined in JIS B1701 may be attached to each shaft of the tooth gap rolls 2 and 3 as a drive transmission gear.
- the teeth 20 and 30 of the tooth gap rolls 2 and 3 do not mesh with each other, but when these gears mesh with each other, the drive is transmitted to the tooth groove rolls 2 and 3 to rotate the tooth groove rolls 2 and 3. Can do. In this case, the teeth 20 and 30 of the tooth gap rolls 2 and 3 do not contact each other.
- a feeding roll 41 that feeds out the base sheet 10 with the base sheet 10 base material (base sheet roll) attached upstream of the tooth gap rolls 2 and 3;
- the pair of first drive rolls 42 and 43 disposed between the feeding roll 41 and the tooth gap rolls 2 and 3, and the conveyance path between the tooth gap rolls 2 and 3 and the first drive rolls 42 and 43.
- a tension detector (not shown) disposed on the control unit, and a control unit (not shown) for controlling the peripheral speed V1 of the first drive rolls 42 and 43 based on the detection output of the tension detector, Based on the detection output of the tension detector, the peripheral speed V1 of the first drive rolls 42 and 43 is adjusted to a predetermined speed with respect to the peripheral speed V2 of the tooth gap rolls 2 and 3 in a state of being engaged with each other, and the base sheet 10 A desired tension is applied to the.
- the control unit when a tension larger than a desired tension is detected, the peripheral speed V1 of the first drive rolls 42 and 43 is slightly increased from the peripheral speed V2 of the tooth gap rolls 2 and 3. To reduce the tension in this section and adjust it to approach the desired tension.
- the peripheral speed V1 of the first drive rolls 42 and 43 is adjusted to a predetermined speed with respect to the feed speed V4 of the base sheet 10 fed from the feed roll 41, and desired tension is applied to the base sheet 10. it can.
- the base sheet 11 stretched between the tooth gap rolls 2 and 3 is drawn from the tooth groove rolls 2 and 3 downstream of the tooth groove rolls 2 and 3.
- the tension in this section is increased by slightly increasing the circumferential speed V3 of the second drive rolls 51 and 52 from the circumferential speed V2 of the tooth gap rolls 2 and 3. Adjust to approach the desired tension.
- the peripheral speed V1 of the first drive rolls 42 and 43 is the speed on the surface of each roll 42 and 43, and the feed speed V4 of the base sheet 10 fed from the feed roll 41 is fed out. It is the speed on the surface of the substrate sheet 10.
- the circumferential speed V3 of the second drive rolls 51 and 52 is the speed on the surface of each of the rolls 51 and 52, similarly to the circumferential speed V1 of the first drive rolls 42 and 43.
- the circumferential speed V2 of the tooth gap rolls 2 and 3 is not the tip of the teeth 20 and 30 but the inside from the tip of the teeth 20 and 30 to half of the meshing depth D of the teeth 20 and 30 as shown in FIG. It is the speed at the entered position D1 (a position that is half of the overlapping length of adjacent teeth).
- the processing means 1 includes a control means (not shown).
- the control means detects the tension by the driving means, the tension detector, and the feeding roll 41, the first driving rolls 42 and 43, and the teeth based on the tension.
- the speed control of each of the groove rolls 2 and 3 and the second drive rolls 51 and 52 is controlled according to a predetermined operation sequence.
- the flexible sheet manufacturing method of the present invention supplies a base sheet 10 from a base sheet roll between a pair of first drive rolls 42, 43, and a pair of first drive rolls 42. 43, the base sheet 10 is supplied to the meshing part of the pair of tooth gap rolls 2 and 3, and the base sheet 10 is stretched in the flow direction between the pair of tooth groove rolls 2 and 3. is doing. Further, in the present embodiment, the stretched base sheet 11 is supplied between the pair of second drive rolls 51 and 52, and flows between the pair of second drive rolls 51 and 52 to the base sheet 10. A pulling-out step of pulling out between the pair of tooth space rolls 2 and 3 while applying tension in the direction.
- the stretching process and the drawing process will be described.
- the base sheet 10 is supplied from the feed roll 41 to the first drive rolls 42 and 43.
- the stretching step as shown in FIGS. 1 and 3, the base sheet 10 is rotated from the pair of first drive rolls 42 and 43, and the meshing portions thereof are rotated while the pair of tooth gap rolls 2 and 3 in the processing means 1 are rotated.
- the base sheet 10 is stretched in the flow direction.
- the peripheral speed V1 of the first drive rolls 42, 43 By making the peripheral speed V1 of the first drive rolls 42, 43 higher than the peripheral speed V2 of the tooth gap rolls 2, 3, the width of the base sheet 10 is reduced before being supplied to the tooth gap rolls 2, 3. In such a manner, the base sheet 10 to which tension is applied can be supplied to the meshing portions of the tooth gap rolls 2 and 3.
- the peripheral speed V1 of the first drive rolls 42, 43 By making the peripheral speed V1 of the first drive rolls 42, 43 higher than the peripheral speed V2 of the tooth gap rolls 2, 3 (V1> V2), in other words, the peripheral speed V2 of the tooth groove rolls 2, 3 is set to the first speed.
- the tension is not applied to the base sheet 10 to which the tension is applied, so that the meshing depth D of the teeth 20 and 30 of the tooth gap rolls 2 and 3 is D. Can be set deeply as described above.
- the ratio [(V2 / V1) ⁇ 100] of the peripheral speed V2 of the tooth gap rolls 2 and 3 to the peripheral speed V1 of the first drive rolls 42 and 43 is 60% to 90%. Preferably, it is 70% to 85%, more preferably 70% to 80%.
- the peripheral speed V2 of the tooth gap rolls 2 and 3 is set lower than the peripheral speed V1 of the first drive rolls 42 and 43, but the meshing depth of the teeth 20 and 30 of the tooth gap rolls 2 and 3 is as follows. Since D is deep as described above, the base sheet 10 can be supplied to the tooth gap rolls 2 and 3 without causing slack.
- the applied tension is preferably 10% or more and 50% or less, and more preferably 10% or more and 40% or less, of the breaking load of the base sheet 10.
- the breaking load of the base sheet 10 is about 60 N per 100 mm width
- the tension applied to the base sheet 10 is preferably 6 to 30 N per 100 mm width, 6 to 24N are more preferable. This means that if the tension is low, the stretchability may not be sufficiently expressed even if the stretching process is performed. Conversely, if the tension is large, the material is stretched in this section and the width shrinks. This is because the sheet width may not be obtained.
- the base sheet 11 stretched between the tooth gap rolls 2 and 3 is supplied between the pair of second drive rolls 51 and 52 in the processing means 1 while rotating, and the base sheet 11
- the base sheet 11 is pulled out from between the pair of tooth gap rolls 2 and 3 while applying tension in the flow direction.
- the peripheral speed V3 of the second drive rolls 51 and 52 is made higher than the peripheral speed V2 of the tooth gap rolls 2 and 3 (V3> V2), and a desired tension is applied to the base sheet 11. preferable.
- the peripheral speed V2 of the tooth space rolls 2 and 3 with respect to the peripheral speed V3 of the second drive rolls 51 and 52 is preferably 10% to 90%, more preferably 30% to 70%, and even more preferably 30% to 50%. Furthermore, it is preferable to set the peripheral speed V3 of the second drive rolls 51 and 52 to be higher than the peripheral speed V1 of the first drive rolls 42 and 43 (V3> V1).
- the ratio [(V1 / V3) ⁇ 100] of the peripheral speed V1 of the first drive rolls 42, 43 to the peripheral speed V3 of the second drive rolls 51, 52 is preferably 30% to 80%, preferably 40% to More preferably, it is 60%.
- the applied tension is preferably 5% or more and 50% or less, and more preferably 5% or more and 20% or less, of the breaking load of the base sheet 11 after stretching.
- the strength reduced by the upstream stretching is taken into consideration, and the break load of the base sheet 11 after the stretching process is taken as a reference. It is preferable from the point which prevents the fracture
- the base material sheet 10 which processes, For example, paper, a single layer nonwoven fabric, a resin film, the laminated body of 2 or more types of nonwoven fabrics, the laminated body of a resin film and a nonwoven fabric, etc. are mentioned, Specifically Includes a thermoplastic polymer nonwoven fabric of polyolefin fibers selected from polypropylene fibers, fibers composed of polypropylene and polyethylene, and bicomponent fibers of polypropylene and polyethylene.
- the nonwoven fabric containing an elastic fiber is preferable from a viewpoint of giving a softness
- a non-elastic fiber layer composed of substantially non-elastic fibers is disposed on at least one surface of an elastic fiber layer containing elastic fibers, and both fiber layers are constituent fibers of the elastic fiber layer.
- a stretchable nonwoven fabric joined by heat fusion hereinafter referred to as a stretchable composite nonwoven fabric
- Examples thereof include stretchable nonwoven fabrics bonded to stretchable nonwoven fabrics over their entire length in a substantially non-stretched state.
- the elastic fiber a fiber made of a thermoplastic elastomer such as styrene elastomer, polyolefin elastomer, polyester elastomer or polyurethane elastomer, or an elastic resin such as rubber is used.
- a fiber made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide or the like is used.
- stretchable composite nonwoven fabric various known materials can be used.
- stretchable sheet described in JP2008-179128A the stretchable sheet described in JP2007-22066A
- JP2007- The elastic nonwoven fabric manufactured by the manufacturing method of the elastic nonwoven fabric described in 22066 gazette, patent 3054930 gazette, etc. can also be used.
- the peripheral speed V1 of the first drive rolls 42 and 43 is set to the tooth gap roll 2. , 3 (V1> V2), in other words, by setting the peripheral speed V2 of the tooth gap rolls 2, 3 to be lower than the peripheral speed V1 of the first drive rolls 42, 43, Since the tension is not applied to the base sheet to which tension is applied, the width W1 of the base sheet 10 immediately before the supply to the tooth gap rolls 2 and 3 is unlikely to become unnecessarily narrow.
- the ratio [(W2 / W0) ⁇ 100] of the width W2 of the processed flexible sheet with respect to the width W0 can be 80% or more (see FIG. 1). Thus, since there is almost no loss by the width shrinkage
- tensile_strength was provided by making the peripheral speed V2 of the tooth gap rolls 2 and 3 lower than the peripheral speed V1 of the 1st drive rolls 42 and 43. Since the tension applied to the base sheet can be lowered, it is difficult for tearing, damage, and strength reduction to occur in the tooth gap rolls 2 and 3 in the stretching process, and the meshing depth of the teeth 20 and 30 of the tooth gap rolls 2 and 3 is reduced. D can be set deeply. Therefore, the flexible sheet obtained by the method for producing a flexible sheet according to this embodiment has high cushioning properties, improves flexibility, and improves touch.
- the manufacturing method of the flexible sheet of the present invention is not limited to the manufacturing method of the above-described embodiment, and can be changed as appropriate.
- the processing means 1 used in the method for manufacturing a flexible sheet of the present embodiment described above is provided with a pair of tooth gap rolls 2 and 3 in the stretching process.
- a pair of tooth gap rolls 2 and 3 in the stretching process.
- the ratio [(V4 / V1) ⁇ 100] of the feeding speed V4 of the base sheet 10 to the circumferential speed V1 of the first drive rolls 42, 43 is preferably 80% to 100%, and 90% to 98%. More preferably it is.
- the applied tension is preferably 10% or more and 50% or less, and more preferably 10% or more and 20% or less of the breaking load of the base sheet 10.
- the breaking load of the base sheet 10 is about 60 N per 100 mm width
- the tension applied to the base sheet 10 is preferably 6 to 30 N per 100 mm width, 6 to 12N is more preferable.
- the processing means 1 used in the method for manufacturing the flexible sheet of the present embodiment described above may be provided with a heater as necessary.
- the first drive rolls 42 and 43, the second drive rolls 51 and 52, and the tooth gap rolls 2 and 3 shown in FIG. By providing a heater in the first drive rolls 42 and 43, the second drive rolls 51 and 52, or the tooth gap rolls 2 and 3, the sheet is easily deformed by applying heat to the sheet and stretched without causing damage. It is easy to do and has the effect of becoming easier to stretch.
- the processing means 1 used in the above-described flexible sheet manufacturing method of the present embodiment may be provided with suction means as necessary.
- a suction path is formed by providing a plurality of openings on the peripheral surfaces of the first drive rolls 42 and 43 and the second drive rolls 51 and 52 shown in FIG. Then, by connecting a suction device outside the roll, a suction force may be applied to the peripheral surface of the roll through the suction path so that the processed sheet can be conveyed.
- the flexible sheet manufactured by the manufacturing method of the present invention is suitable for constituent materials such as top sheets, back sheets, three-dimensional gathers, exterior materials of absorbent articles typified by disposable diapers, sanitary napkins, body fluid absorption pads and the like. Can be used.
- a flexible sheet was obtained using the processing means shown in FIG.
- the flexible sheets of Examples 1 to 5 below are sheets formed by using the apparatus provided with the following tooth gap rolls and processing the following base sheet only once between each roll under the following processing conditions. is there. The following evaluation was performed about the obtained flexible sheet. The results are shown in Table 1.
- ⁇ Material of base sheet> In the base material sheet to be processed, a large number of the following elastic filaments arranged so as to extend in one direction without crossing each other are bonded to the following non-stretchable nonwoven fabric over their entire length in a substantially non-stretched state.
- the elastic composite nonwoven fabric used was used.
- Elastic filament Styrenic thermoplastic elastomer fiber, fiber diameter 30 ⁇ m
- Basis weight of elastic filament layer 40 g / m 2
- Stretchable nonwoven fabric PET / PE core / sheath structure fiber, fiber thickness 2 dtex Basic weight of stretchable nonwoven fabric: 10 g / m 2
- the peripheral speed ratio and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed.
- the first embodiment is characterized in that the peripheral speed V1 of the first drive roll is set higher than the peripheral speed V2 of the tooth gap roll.
- Example 2 A crevice roll having the same conditions as in Example 1 was used except that the meshing depth D of the teeth of the roll was changed to 2.8 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed.
- Example 3 A tooth gap roll having the same conditions as in Example 1 was used except that the meshing depth D of the teeth of the roll was changed to 2.6 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed.
- Example 4 A tooth gap roll having the same conditions as in Example 1 was used except that the mesh depth D of the teeth of the roll was changed to 2.4 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed.
- Example 5 A crevice roll having the same conditions as in Example 1 was used except that the meshing depth D of the teeth of the roll was changed to 2.2 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed.
- Example 1 A crevice roll having the same conditions as in Example 1 was used except that the meshing depth D of the teeth of the roll was changed to 2.0 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed. As is clear from Table 1, in Comparative Example 1, unlike the example, the peripheral speed V2 of the tooth gap roll is set higher than the peripheral speed V1 of the first drive roll.
- Example 2 A crevice roll having the same conditions as in Example 1 was used except that the meshing depth D of the teeth of the roll was changed to 1.8 mm. Moreover, the material similar to Example 1 was used for the base material sheet. The ratio of the peripheral speed and the tension applied to the base sheet were set to the conditions shown in Table 1, and the base sheet was processed. As is clear from Table 1, in Comparative Example 1, unlike the example, the peripheral speed V2 of the tooth gap roll is set higher than the peripheral speed V1 of the first drive roll.
- the thickness of the flexible sheet is 0.5 cN / cm 2 between the flat plates with the load of 0.5 cN / cm 2 , and the distance between the flat plates is determined by the laser displacement meter LK- of Keyence Corporation. It was determined by measuring with G030. Specifically, the thickness (height) of the flat plate before sandwiching the sheet was measured, and then the thickness (height) of the flat plate sandwiching the sheet was measured, and the difference was obtained as the thickness of the sheet.
- the flexible sheet of each example has almost no loss due to the shrinkage of the width from the initial width of the base sheet compared to the flexible sheet of the comparative example. Moreover, it turns out that the flexible sheet
- the method for producing a flexible sheet of the present invention it is possible to produce a sheet that is hard to shrink, has high flexibility, and is excellent in touch.
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Abstract
Description
例えば、特許文献1には、歯溝(ギヤ)の噛み合い度を調整することにより、不織布等のシートを延伸する技術が提案されている。
また、本発明は、前記第1駆動ロールの周速度V1と前記歯溝ロールの周速度V2との関係を、V1>V2とした柔軟性シートの製造方法を提供するものである。
図1~図3は、本発明の柔軟性シートの製造方法に用いられる加工手段(以下、単に加工手段ともいう。)の一実施形態を模式的に示したものである。
また、第2駆動ロール51,52の周速度V3とは、第1駆動ロール42,43の周速度V1と同様に、各ロール51,52表面での速度のことである。歯溝ロール2、3の周速度V2とは、歯20,30の先端ではなく、図2に示すように、歯20,30の先端から歯20,30の噛み合い深さDの半分まで内側に入った位置D1(隣接する歯同士の重なり合う長さの半分の位置)での速度のことである。
以下、延伸工程、及び引き出し工程について説明する。
付与される張力は、基材シート10の破断荷重の10%以上50%以下であることが好ましく、10%以上40%以下であることが更に好ましい。基材シート10に付与される張力は、例えば、基材シート10の破断荷重が100mm幅あたり約60Nの場合には、延伸加工前に加える張力は100mm幅あたり6~30Nが好ましく、100mm幅あたり6~24Nが更に好ましい。これは張力が小さい場合は延伸加工を行っても伸縮性が十分に発現されないことがあり、逆に張力が大きい場合はこの区間において材料が伸ばされて幅縮みが起こり、延伸加工後の所望のシート幅が得られないことがあるためである。
<歯溝ロールの形態及び歯の噛み合い深さ>歯溝ロール2,3とも同じ仕様
歯溝ロールの歯のピッチP:2.0mm
ロールの歯の幅T1:0.7mm(根元)、幅T2:0.5mm(先端)
ロールの歯の高さH:3.5mm
ロールの歯のP.C.D(Pitch Circle Diameter):150mm
ロールの歯の噛み合い深さD:3.0mm(歯の接触があり連れ回りで回転)
加工を施す基材シートには、互いに交差せずに一方向に延びるように配列した多数の下記弾性フィラメントが、実質的に非伸長状態で、それらの全長にわたり、伸長可能な下記不織布に接合されている伸縮性複合不織布を用いた。
弾性フィラメント:スチレン系の熱可塑性エラストマー繊維、繊維径30μm
弾性フィラメント層の坪量:40g/m2
伸長可能な不織布:PET/PE芯/鞘構造繊維、繊維太さ2dtex
伸長可能な不織布の坪量:10g/m2
複合シート坪量:50g/m2
基材シートの加工前の幅:250mm
ロールの歯の噛み合い深さDを2.8mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。
ロールの歯の噛み合い深さDを2.6mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。
ロールの歯の噛み合い深さDを2.4mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。
ロールの歯の噛み合い深さDを2.2mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。
ロールの歯の噛み合い深さDを2.0mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。表1から明らかなように、比較例1は、実施例と異なり、歯溝ロールの周速度V2を第1駆動ロールの周速度V1より高速に設定している。
ロールの歯の噛み合い深さDを1.8mmに変更した以外は、実施例1と同様の条件の歯溝ロールを用いた。また、基材シートの材質は、実施例1と同様のものを用いた。周速度の比率、及び基材シートにかける張力を、表1に記載の条件に設定し、基材シートに加工を施した。表1から明らかなように、比較例1は、実施例と異なり、歯溝ロールの周速度V2を第1駆動ロールの周速度V1より高速に設定している。
実施例及び比較例の条件で柔軟性シートを製造する際に、基材シートの最初の幅W0に対する歯溝ロールへの供給直前での基材シートの幅W1の比率〔(W1/W0)×100〕、及び基材シートの最初の幅W0に対する加工後の柔軟性シートの幅W2の比率〔(W2/W0)×100〕を測定した。また、実施例及び比較例で得られた柔軟性シートについて、厚み、クッション性、120%伸張させた時点での荷重(120%強度)を以下の方法で測定した。それらの結果を以下の表1に示す。
柔軟性シートの厚みは、0.5cN/cm2の荷重にて平板間に実施例及び比較例で得られた柔軟性シートを挟み、平板間の距離をキーエンス(株)のレーザー変位計LK-G030で測ることで求めた。詳細には、シートを挟む前の平板の厚み(高さ)を測定し、次にシートを挟む平板の厚み(高さ)を測定し、その差をシートの厚みとして求めた。
測定前に実施例及び比較例で得られた柔軟性シートを計測寸法(2cm×2cm以上)にカットし24時間以上放置して、測定前にシートに加えられている歪みを取り除く。圧縮測定器を用いて、シートを0.02mm/secの圧縮速度で最大荷重50gf/cm2になるまで圧縮した時の圧縮仕事量(a)、その後同速度で圧力を取り除き荷重が0になった時の回復仕事量(b)から、次式によって圧縮回復率(%)(クッション性)を算出した。 圧縮回復率=(b/a)×100(%)
圧縮測定器は、例えばカトーテック(株)製ハンディー圧縮試験機を使用し、加圧板円形2cm2、自動反転、アンプ感設定(SENS2、STROKESET5.0)とし、ハンディ圧縮測定プログラムによりデータ化した。
実施例及び比較例で得られた柔軟性シートを、その機械流れ方向へ200mm、それと直交する方向へ25mmの大きさでカットし試験片を得た。島津製作所製の引張試験機AG-1kNISに試験片をチャック間距離:150mmで装着した。試験片をその長手方向へ300mm/分の速度で引っ張ったときの荷重-伸度特性を調べた。各3本の試験片について120%伸長させた時点での応力を測定した。
Claims (5)
- 基材シートを一対の第1駆動ロールから互いに噛み合う一対の歯溝ロールの噛み合い部分に供給して、一対の該歯溝ロール間で該基材シートをその流れ方向に延伸加工する延伸工程を具備する柔軟性シートの製造方法であって、
前記第1駆動ロールの周速度V1と前記歯溝ロールの周速度V2との関係を、V1>V2とした柔軟性シートの製造方法。 - 一対の前記歯溝ロールの噛み合い部分に供給される基材シートは、一対の前記第1駆動ロールと一対の前記歯溝ロールとの間で該基材シートの流れ方向に張力を付与される請求の範囲第1項記載の柔軟性シートの製造方法。
- 一対の歯溝ロールの噛み合い部分に供給して延伸加工された基材シートを一対の第2駆動ロールに供給して、一対の該第2駆動ロールで該基材シートにその流れ方向に張力を加えながら一対の前記歯溝ロールから引き出す引き出し工程を具備し、
前記第2駆動ロールの周速度V3と前記第1駆動ロールの周速度V1との関係を、V3>V1とした請求の範囲第1項又は第2項記載の柔軟性シートの製造方法。 - 一対の前記歯溝ロールは、前記基材シートを延伸倍率1.1~5.0倍に延伸加工する請求の範囲第1項ないし第3項の何れか1項に記載の柔軟性シートの製造方法。
- 前記基材シートが弾性繊維を含む不織布からなり、前記延伸工程によって前記基材シートにその流れ方向に伸縮性を付与する請求の範囲第1項ないし第4項の何れか1項に記載の柔軟性シートの製造方法。
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CN102510913A (zh) | 2012-06-20 |
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EP2487287B1 (en) | 2016-12-28 |
JP5268854B2 (ja) | 2013-08-21 |
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US20120181722A1 (en) | 2012-07-19 |
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US8945452B2 (en) | 2015-02-03 |
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