JP4757139B2 - Sheet manufacturing method and processing apparatus - Google Patents

Description

  The present invention relates to a sheet manufacturing method including a step of performing stretching and a sheet processing apparatus used therefor.

  Using a processing device provided with a pair of rolls provided on the peripheral surface portion so that the tooth grooves engaged with each other along the rotation axis direction, the roll is rotated to supply a sheet of nonwoven fabric or the like to the meshing portions, Various techniques for processing a sheet have been proposed (for example, see Patent Documents 1 to 4 below).

JP-T-2002-501127 JP 2001-328191 A JP 2003-73967 A JP 2004-174234 A

  By the way, when performing a drawing process through a sheet between a pair of rolls having a tooth gap as in these techniques, if the depth of the tooth gap is increased, a process with a high draw ratio can be performed. Since it is necessary to rotate by meshing, there is a limitation due to the shape of the tooth groove in order to perform the stretching process at a high stretching ratio, and it has been difficult to perform processing such as imparting high stretchability or deep irregularities .

  Therefore, an object of this invention is to provide the manufacturing method of the sheet | seat which has a high expansion-contraction characteristic, and the processing apparatus of the sheet | seat used for it.

  The inventors of the present invention have studied a stretching method using a pair of rolls provided on the peripheral surface portion so that the teeth that mesh with each other along the rotation axis direction. As a result, the roll is applied in a state where a tension higher than the conveying tension is applied. It has been found that a sheet having a high stretchability (easily stretched even with a small force) can be obtained by passing through the gap, and the present invention has been completed.

  The present invention rotates a pair of rolls provided on the peripheral surface portion so that the tooth grooves meshing with each other are along the rotation axis direction, supplying a base sheet to the meshing portions, and supplying the base sheet to the flow direction thereof A sheet manufacturing method including a step of performing a drawing process, wherein the base sheet is supplied to the meshing portion while applying a tension of 10 to 90% of the breaking load in the flow direction of the base sheet. The object is achieved by providing a method for producing a sheet.

  Further, the present invention is a sheet processing apparatus for carrying out the method for manufacturing a sheet of the present invention, a pair of rolls provided on the peripheral surface portion so that the tooth grooves engaged with each other along the rotation axis direction, The present invention provides a sheet processing apparatus comprising sheet supply means for supplying a base sheet to the meshing portion of the tooth gap and tension applying means for applying tension to the sheet supplied between the rolls.

  According to the present invention, it is possible to suitably manufacture a sheet having an unprecedented high stretch property.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
1 and 2 schematically show an embodiment of a sheet processing apparatus (hereinafter also simply referred to as a processing apparatus) according to the present invention.

  As shown in FIG. 1, the processing apparatus 1 according to the present embodiment includes a pair of rolls 2 and 3 provided on a peripheral surface portion so that teeth that mesh with each other along the rotation axis direction, and a flow of a base sheet 10 to be processed. Anti-slip means 4 for preventing slipping in the direction, and tension applying means 5 and 6 for applying tension in the flow direction of the base sheet 10 before and after processing by the rolls 2 and 3 are provided. When the rolls 2 and 3 are rotated, the processing apparatus 1 performs stretch processing in the flow direction on the base sheet 10 supplied to the meshing portions to impart stretchability. In the processing apparatus 1 of this embodiment, the rolls 2 and 3 are configured by rolls of the same form. As shown in FIG. 1, the tooth grooves engaged with the rolls 2 and 3 are provided on the peripheral surface portion so as to follow the rotation axis direction. 3 in the circumferential direction so that the direction extending in the width direction is parallel to each other, and a groove is formed between the tooth 20 and the tooth 20 or between the tooth 30 and the tooth 30. It means that the teeth of the roll are provided so as to mesh with each other.

  As shown in FIG. 2, the pitch P between adjacent teeth 20 and 30 in each roll 2 and 3 is 1.0 mm to 5.0 mm, and the width W of each tooth is less than ½ of the pitch. The tooth height H is preferably equal to or greater than the pitch of adjacent teeth. The form of the tooth gap in each roll is within such a range, and high stretchability that has not been conventionally provided can be imparted to the sheet supplied between these rolls 2 and 3. Here, the pitch between adjacent teeth in the roll refers to the distance between the centerline of one tooth and the centerline of adjacent teeth. The width of a roll tooth means 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 height of the teeth of the roll refers to the length from the root to the tip of the teeth.

  The pitch P between adjacent teeth in each of the rolls 2 and 3 is preferably 1.5 to 3.5 mm, and more preferably 2.0 to 3.0 mm in consideration of uniform elongation. Further, the tooth width W in each of the rolls 2 and 3 is preferably 1/4 to 1/2 of the pitch between the teeth, more preferably 1/3 to 1/2, considering the strength of the teeth. Further, the tooth height H of each roll is set to 2.0 when the tooth pitch is 2.0 mm, for example, in order to give stretchability to the material. 0 (times) to 4.0 (2.0 times the pitch) mm is preferable, and 2.5 (1.25 times the pitch) to 3.5 (1.75 times the pitch) mm is more preferable.

  Moreover, it is preferable to chamfer the corner | angular part of the front-end | tip of the teeth 20 and 30 in each roll 2 and 3 so that a material may not give damage to a corner | angular part. The radius of curvature of chamfering is preferably 0.1 to 0.3 mm.

  The engagement depth D of the teeth 20 and 30 of the rolls 2 and 3 is preferably 1.0 mm or more, and more preferably 2.0 mm or more in consideration of increasing the draw ratio in order to give the material stretchability. Here, the meshing depth of teeth refers to a length of overlapping adjacent teeth when the rolls are meshed and rotated.

  The rolls 2 and 3 are engaged with each other and rotated when a driving force from a driving means (not shown) is transmitted to one of the rotating shafts. In addition to the teeth 20 and 30, a general gear defined in JIS B1701 may be attached to each shaft of the rolls 2 and 3 as a drive transmission gear. As a result, the teeth 20 and 30 of the rolls 2 and 3 do not mesh with each other, but the gears mesh with each other so that the drive is transmitted to the rolls 2 and 3 and the rolls 2 and 3 can be rotated. In this case, the teeth 20 and 30 of the rolls 2 and 3 do not contact each other.

  As shown in FIG. 1, the slip preventing means 4 includes rolls 41 and 42 that are in contact with the roll 2. The rolls 41 and 42 are composed of rubber rolls. By pressing the peripheral surface portions of the rolls 41 against the roll 2, slipping and shrinkage of the material passing between the rolls 2 and 42 can be suppressed. The slip and shrinkage of the base sheet 10 passing between the three can be suppressed. In the present invention, as will be described later, slipping and shrinkage of the base sheet 10 can be suppressed even by passing between the rolls 2 and 3 with high tension applied to the base sheet 10. The above-described effects are further enhanced. The rolls 41 and 42 can also be arranged so that the peripheral surface portion is pressed against the roll 3, whereby the same effect as described above can be achieved. As another example of the slip prevention means 4, a suction path that opens in the peripheral surface portion is provided in one of the rolls, and a suction means that sucks the processed sheet through the suction path is provided, so that material slip or Shrinkage can also be suppressed.

  In the present embodiment, the tension applying means 5 is arranged on a pair of nip rolls 51, 52 arranged on the upstream side of the rolls 2, 3, and on a conveyance path between the nip rolls 51, 52 and the rolls 2, 3. A tension detector (not shown), and a controller (not shown) for controlling the peripheral speed of the nip rolls 51 and 52 based on the detection output of the tension detector. Based on the detected output, the peripheral speed of the nip rolls 51 and 52 is adjusted to a predetermined speed with respect to the peripheral speed of the rolls 2 and 3, and a desired tension is applied to the base material sheet 10 supplied between the rolls 2 and 3. As a specific control method by the control unit, when a tension larger than a desired tension is detected, the desired tension is reduced by slightly increasing the peripheral speed of the rolls 51 and 52 to reduce the tension in this section. Adjust to get closer to. When a tension smaller than the desired tension is detected, the peripheral speed of the rolls 51 and 52 is slightly decreased, and the tension in this section is increased to adjust the tension closer to the desired tension.

  The tension applying means 6 includes a pair of nip rolls 61 and 62 arranged on the downstream side of the rolls 2 and 3, and a tension detector (on the conveyance path between the nip rolls 61 and 62 and the rolls 2 and 3). And a control unit (not shown) for controlling the peripheral speed of the nip rolls 61 and 62 based on the detection output of the tension detector, and the nip roll based on the detection output of the tension detector. The peripheral speeds 61 and 62 are adjusted to a predetermined speed with respect to the peripheral speeds of the rolls 2 and 3, and a desired tension is applied to the processed base sheet. Specific control by the control unit is performed similarly to the control in the tension applying means 5 described above.

  The processing apparatus 1 includes control means (not shown), and the control means controls the driving means and the slip prevention means 4 according to a predetermined operation sequence.

  According to the processing apparatus 1 of the present embodiment, it is possible to perform stretching with a stretch ratio as high as preferably 50% or more, particularly preferably 100 to 400%. Here, the draw ratio is (the length when the material is stretched by meshing of the rolls having tooth gaps-the length of the material before stretching by meshing of the rolls) / (before stretching by meshing of the rolls) Material length) x 100 (%).

  Next, an embodiment of the sheet manufacturing method of the present invention will be described based on a sheet manufacturing method including a step of processing a base sheet using the processing apparatus 1 of the embodiment.

  As shown in FIG. 1, the base sheet 10 is supplied to the meshing portion of the processing apparatus 1 while rotating the pair of rolls 2 and 3. Then, as shown in FIG. 3, the base sheet 10 is stretched between the rolls 2 and 3.

From the viewpoint of imparting stretchability more effectively by applying tension to the base sheet 10, the rolls 2, 3 are subjected to tension in the flow direction by the nip rolls 51, 52 on the base sheet 10 before processing. Supply in between. The tension applied to the supplied base sheet 10 is 10% to 90%, preferably 20% to 80% of the breaking load in the flow direction of the base sheet before processing. When the breaking load of the substrate sheet 10 shown below is, for example, about 60 N per 100 mm width, the tension applied before stretching is preferably 6 to 54 N per 100 mm width, and more preferably 12 to 48 N per 100 mm width. Since the conventional conveyance tension is 3 to 5 N per 100 mm width, the stretching process is performed with a high tension applied.
Moreover, it is preferable to apply tension to the processed base material sheet 10 by the nip rolls 61 and 62 and pull out from between the rolls. The tension applied to the substrate sheet 10 to be supplied is preferably 5% to 80% of the breaking load of the processed base sheet in the flow direction of the processed base sheet, and more preferably 10% to 70%. preferable. The breaking load of the material is smaller after processing than before stretching. Further, the processed substrate sheet 10 provided with stretchability by stretching is easily stretched even with a slight tension. From such a viewpoint, it is preferable to make the tension applied to the processed base sheet 10 weaker than the tension applied to the base sheet 10 before processing.

Although there is no restriction | limiting in particular in the material of the base material sheet 10 which processes, In order to show the effect brought about by the extending | stretching process by the processing apparatus 1 further, the nonwoven fabric which has a stretching property is preferable, and especially at least one surface of an elastic fiber layer In addition, a substantially inelastic non-elastic fiber layer is disposed, and both the fiber layers are joined together by thermal fusion of fiber intersections in a state in which the constituent fibers of the elastic fiber layer maintain the fiber form. A stretchable nonwoven fabric in which a part of the constituent fibers of the elastic fiber layer enters the elastic fiber layer and / or a part of the constituent fibers of the elastic fiber layer enters the non-elastic fiber layer (hereinafter, It is referred to as an elastic composite nonwoven fabric). Moreover, in order to make the joint of an elastic fiber and an inelastic fiber stronger, the elastic composite nonwoven fabric which gave embossing is more preferable.

  The thickness of the non-elastic fiber layer is preferably 1.2 to 20 times the thickness of the elastic fiber layer, and the basis weight is preferably higher in the elastic fiber layer than in the non-elastic fiber layer. The fiber diameter of the constituent fibers of the elastic fiber layer is preferably 1.2 to 5 times the fiber diameter of the constituent fibers of the non-elastic fiber layer, and preferably 10 to 100 μm.

  The constituent fiber of the elastic fiber layer is preferably a fiber made of a thermoplastic elastomer such as a styrene elastomer, a polyolefin elastomer, a polyester elastomer or a polyurethane elastomer. The constituent fibers of the inelastic fiber layer are preferably fibers made of short fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide or the like as the fibers constituting the inelastic fiber layer. .

  The processing apparatus 1 is used for the base material sheet having the above-described configuration, and the elongation is 80 to 160% by applying the high tension as described above and the high stretching process in which the stretching ratio exceeds 200%. A sheet having a high elasticity such as (at a load of 100 cN / 25 mm) can be continuously produced. Here, the elongation refers to (material length after applying a tensile load−material length before applying a tensile load) / (material length before applying a tensile load) × 100 (%). .

  In addition to the base sheet 10 described above, it is preferable to use a laminated sheet and a single-layer fiber sheet described below as the base sheet in order to obtain high stretchability.

  As the laminated sheet, as shown in FIGS. 4A and 4B, the substantially inelastic second and third are respectively formed on both surfaces of the first fiber layer (elastic layer) 11 having elastic stretchability. There is a laminated sheet 10A in which fiber layers (non-elastic fiber layers) 12 and 13 are laminated, and these are partly joined in a regular pattern.

  Such a laminated sheet 10A is an elastic fiber formed by a fiber molding machine on a fiber web (third fiber layer) supplied from the first card machine and continuously conveyed in one direction (flow direction, MD). To form a layer made of elastic fibers (first fiber layer) continuously on the fiber web, and further to the fiber web (second fiber layer) supplied from the second card machine. ) Is continuously supplied, and then the resulting laminated sheet having a three-layer structure is subjected to hot air treatment by an air-through dryer, and the embossed convex portion is formed on the peripheral surface of the laminated sheet after the hot air treatment. Can be obtained by hot embossing with an embossing device having an embossing roll arranged regularly and an anvil roll arranged opposite thereto. Thereby, as shown in FIG. 4, the lamination sheet in which the junction part 14 was formed in the regular pattern is obtained.

  In the laminated sheet manufacturing method described above, the hot air treatment using a dryer is performed for the purpose of heat-sealing elastic fibers and inelastic fibers and entering the fibers, but such hot air treatment can be omitted.

  The first fiber layer (elastic layer) 11 can be stretched and has a property of contracting when released from the stretched force, and contracted after 100% stretching at least in one direction parallel to the surface. Is preferably 20% or less, and more preferably 10% or less when the resin is contracted after 100% elongation. These values are preferably satisfied in at least one of the MD direction and the CD direction, and more preferably satisfied in both directions. The maximum elongation is preferably 30 to 500%, particularly preferably 300 to 500%.

  The first fiber layer (elastic layer) 11 preferably includes elastic fibers made of an elastic material. Examples of the elastic material include a thermoplastic elastomer, rubber, ethylene / propylene copolymer, and the like. Among these, a thermoplastic elastomer is preferable because a fibrous elastic body can be formed relatively easily. Examples of the thermoplastic elastomer include polyurethane, styrene (SBS, SIS, SEBS, SEPS, etc.), olefin (copolymers such as ethylene, propylene, butene, etc.), vinyl chloride, and polyester. These can be used individually by 1 type or in combination of 2 or more types.

The content of elastic fibers made of an elastic material in the first fiber layer 11 is preferably 50 to 100% by weight, and particularly preferably 75 to 100% by weight. The elastic fiber resin of the first fiber layer 11 may include non-elastic resins such as polyethylene, polypropylene, polyester (PET or PBT), nylon, organic or inorganic pigments, and various additives (antioxidants, plasticizers, etc.). it can. In addition, the first fiber layer may contain inelastic fibers, organic or inorganic pigments.
As an elastic layer, it can replace with what consists of a fiber layer, and a film-like thing, a net-like thing, etc. can also be used. As the film or net forming material, the above-mentioned various elastic materials can be used.

  The second and third fiber layers (inelastic fiber layers) 12 and 13 have extensibility, but are 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. Any of the cases where the three-dimensional structure formed by a plurality of fibers is structurally changed by wearing or the constituent fibers are broken and stretched as a fiber layer.

  Examples of the fibers constituting the inelastic fiber layer include fibers made of biodegradable resins such as polyethylene, polypropylene, polyester (PET and PBT), nylon, and polylactic acid. The fibers constituting the inelastic fiber layer may be short fibers or long fibers, and may be hydrophilic or water repellent. Moreover, a core-sheath 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. In particular, short fibers tend to cause fluff due to stretching. However, the use of this method is preferable in that the joint is less likely to break, and thus the strength is high, and fluff can be prevented and the touch can be improved.

  For example, as illustrated in FIG. 4B, the bonding portion 14 is preferably formed discontinuously in both the flow direction (MD) and the orthogonal direction (CD) of the laminated sheet 10 </ b> A. In addition, the laminated sheet 10A has the second fiber layer 12 and / or the third fiber layer 13 from the viewpoint of obtaining a stretchable nonwoven fabric (stretchable sheet) that is comfortable to the touch. Preferably, the other portions are convex portions.

On the other hand, the single-layer fiber sheet used for the base sheet 10 includes a single-layer fiber that includes an elastic component and a substantially inelastic component, and has a partial embossed portion formed by embossing. Sheet. For example, (1) a core-sheath type composite fiber having a core part made of an elastic component and a sheath part made of a substantially inelastic component, or a side-by-side type composite fiber made of an elastic component or an inelastic component An embossed portion formed by embossing in a pattern similar to that in the first embodiment described above on a fiber web, nonwoven fabrics of various manufacturing methods, etc., composed of multi-part composite fibers, and (2) an elastic fiber A fiber web or non-woven fabric of various manufacturing methods containing inelastic fibers in a mixed state can be used in which an embossed part is formed by embossing in the same pattern as the joint part in the laminated sheet described above. Specific examples of the fiber sheet include a fiber web obtained by the card method, a spun bond, a fiber web spun by a melt blown, a hydroentangled fiber web, a needle entangled fiber web, and a number of heat-sealed portions using a heat roll. The thing formed in the shape of a dot in visual observation can be mentioned.
As an elastic component, the constituent material of the elastic fiber mentioned above can be mentioned. Examples of the substantially inelastic component include the constituent materials of the inelastic fiber described above.

  As described above, according to the processing apparatus 1 and the sheet manufacturing method using the processing apparatus 1 according to the present embodiment, the substrate sheet 10 is once passed while applying a predetermined tension between the rolls 2 and 3 that are engaged and rotated. By simply applying tension in advance, the fiber layer constituting the base sheet 10 can be easily stretched, and the base sheet between the rolls 2 and 3 that are engaged and rotated by applying high tension. From the effect of suppressing slippage and shrinkage of the material in the flow direction of 10 or the stretching direction, the base sheet 10 is effectively stretched, and a sheet with high stretchability expressed by this is suitable. Can be manufactured. Moreover, since the processing apparatus of this embodiment can perform the outstanding extending | stretching process only by passing a base material sheet | seat once, it can supply the processed sheet as it is in-line to the manufacturing line of the applied product.

  In addition, by providing a high tension even when the draw ratio is low, a sheet having stretch properties equivalent to those stretched at a high draw ratio can be produced. An effect is produced. That is, when the sheet is stretched through a sheet between a pair of rolls having a tooth gap as in the prior art, if the depth of the tooth groove is increased, a process with a high stretch ratio can be performed. It is necessary to rotate together. Therefore, in order to perform a drawing process at a high draw ratio, there is a limitation on the shape of the tooth gap, so the width of the roll teeth must be reduced. However, as in this embodiment, in a roll (roll having a tooth gap) that is stretched at a low draw ratio, the shape restriction is somewhat relaxed at the time of designing the roll, so that the roll is drawn at a high draw ratio. It becomes possible to make the width of the teeth wider than the roll to be processed. Therefore, the drawing process can be performed at a low draw ratio, that is, the strength of the tooth gap can be secured. As a result, the lifetime of the apparatus can be extended, and the labor and cost of manufacturing the apparatus can be reduced. In the present embodiment, the base sheet can be given high stretchability by stretching the base sheet in a tensioned state as described above. An uneven shape can be imparted to the sheet.

The present invention is not limited to the embodiment.
Although the processing apparatus 1 of the said embodiment used the roll which has a tooth gap of the form which deviates from the prescription | regulation of the dimension shape according to the standard reference | standard rack dimension prescribed | regulated to JISB1701, this applies high tension. This is because a sheet having excellent stretchability can be obtained by performing stretching at a high stretching ratio. The sheet manufacturing method of the present invention can also use a roll having a tooth gap that conforms to the regulations, and the same effect can be achieved in that case.

  Further, for example, a plurality of rolls 2 and 3 (two machines in FIG. 4 for convenience) are arranged in series in the machine flow direction of the base sheet 10 as in the processing apparatus 1 ′ of the embodiment shown in FIG. By repeatedly applying the stretching process to the base sheet 10 according to 2 and 3, the base sheet 10 can be made to exhibit high stretchability.

  Further, the processing apparatus of the present invention and the method for producing a sheet using the same are particularly suitable for producing a stretchable sheet using the nonwoven fabric as described above as a base sheet, but other than that, for example, other A non-woven fabric, paper, a resin film, or a composite sheet obtained by combining these can be used as a base sheet, and the base sheet can be subjected to a high stretching process. Stretchability can be imparted to the sheet that has been subjected to such stretching.

  The processing apparatus of the present invention may be provided with a heater or the like as necessary, and a temperature adjusting means for adjusting the temperature by heating the roll. Further, a suction path that opens in the peripheral surface portion of the one roll may be provided, and a suction unit that sucks the processed sheet through the suction path may be provided so that the processed sheet can be transferred.

Hereinafter, the present invention will be described more specifically with reference to examples.
Using the apparatus of Examples 1 and 2 below, the following substrate sheet was passed only once between each roll under the following processing conditions. The processed sheet was examined for elongation when a load was applied under the following conditions. The results are shown in Table 1.

[Example 1]
<Roll form and tooth meshing depth> Same specifications for both rolls Roll tooth pitch: 2 mm
Roll tooth width: 0.7 mm (root), 0.525 mm (tooth tip)
Roll tooth height: 3.5mm
P. of the teeth of the roll C. D (Pitch Circle Diameter): 150mm
Engagement depth of roll teeth: 2.7 mm

<Material of base sheet>
As the base material sheet to be processed, a stretchable composite nonwoven fabric in which non-elastic fiber layers made of the following non-elastic fibers were combined on both surfaces of an elastic fiber layer made of the following elastic fibers by an air-through method was used. Moreover, the heat embossing of 130 degreeC is given.
Elastic fiber: Styrenic thermoplastic elastomer fiber, fiber diameter 30 μm
Basis weight of elastic fiber layer: 40 g / m ²
Non-elastic fiber: PET / PE core / sheath structure fiber, fiber thickness 2 dtex
Basis weight of inelastic fiber layer: 10 g / m ²
Composite sheet basis weight: 60 g / m ²
Breaking load of substrate sheet: 58 N / 100 mm width (N = 3 average of measured values)

<Processing conditions>
Tension applied to substrate sheet before processing: 30 N / 100 mm width (51.7% of breaking load)
Tension applied to processed substrate sheet: 1.0 N / 100 mm width

(Measurement of elongation)
A test piece having a width of 25 mm and a length of 75 to 100 mm is prepared from the processed sheet, and the test piece is set in a tensile tester so that the machine flow direction of the sheet is a tensile direction (distance between chucks is 50 mm). The load-elongation characteristic when pulled at a load cell speed of 300 m / min was examined. The same measurement was performed on the three test pieces, and the average value thereof was obtained. And the elongation at the time of 100 cN / 25mm was employ | adopted for evaluation elongation.

[Comparative Example 1]
The same sheet as in Example 1 was processed in the same manner as in Example 1 except that the tension applied to the base material sheet before processing was changed to 5 N / 100 mm width (8.6% of the breaking load).

[Example 2]
The same sheet as in Example 1 was processed in the same manner as in Example 1 using an apparatus provided with a pair of rolls having tooth spaces in the shape of the following general involute gears.
<Roll form and tooth meshing depth>
Roll tooth module: 0.75mm
Note that the width, height, and pitch of the teeth of the roll are defined by JIS B1701 according to the tooth module.
P. of the teeth of the roll C. D: 150mm
Engagement depth of roll teeth: 0.75mm
<Processing conditions>
Tension applied to substrate sheet before processing: 30 N / 100 mm width (51.7% of breaking load)
Tension applied to processed substrate sheet: 1.0 N / 100 mm width

[Comparative Example 2]
The same sheet as in Example 1 was processed in the same manner as in Example 2 except that the tension applied to the base material sheet before processing was 5 N / 100 mm width (8.6% of the breaking load). The results are shown in Table 1.

  As shown in Table 1, it was found that in both cases of Examples 1 and 2, a sheet having high stretchability can be produced by applying a high tension as compared with a case where the tension is low. On the other hand, the sheets subjected to the stretching process with a low tension as in Comparative Examples 1 and 2 were inferior in stretchability to 77% and 20%, respectively, as compared to when the high tension was applied. It was.

  INDUSTRIAL APPLICABILITY The sheet processing apparatus and sheet manufacturing method of the present invention can be used in various industries depending on the sheet to be processed, such as absorbent articles such as disposable diapers and sanitary napkins, clothing, and medical use. It can be used for manufacturing various articles such as bandages and poultices.

It is a figure which shows typically one Embodiment of the processing apparatus of the sheet | seat of this invention, and the manufacturing process of a sheet | seat using the same. It is the elements on larger scale of the roll in the embodiment. It is a figure which shows typically the state which has extended | stretched the base material sheet between a pair of rolls in the processing apparatus of this embodiment. It is an enlarged view which shows typically one form of the base material sheet used for the manufacturing method of the sheet | seat of this invention, (a) is a top view, (b) is a side view. It is a figure which shows typically other embodiment of the processing apparatus of the sheet | seat of this invention, and the manufacturing process of a sheet | seat using the same.

Explanation of symbols

1, 1 'sheet processing apparatus 2, 3 roll 20, 30 teeth 4 slip prevention means 5, 6 tension applying means 10, 10A base material sheet

Claims (7)

A pair of rolls provided on the peripheral surface portion are rotated so that the tooth grooves engaged with each other are along the rotation axis direction, the base sheet is supplied to the meshing portions, and the base sheet is stretched in the flow direction. A method for producing a sheet comprising steps,
A sheet manufacturing method for supplying the base sheet to the meshing portion while applying a tension of 10 to 90% of the breaking load in the flow direction of the base sheet.   The manufacturing method of the sheet | seat of Claim 1 which pulls out the processed base material sheet from between the said rolls, applying tension | tensile_strength in the flow direction.   The sheet manufacturing method according to claim 1 or 2, wherein a plurality of the pair of rolls are arranged in a flow direction of the base sheet, and the stretching process is repeatedly performed on the base sheet.   The method for producing a sheet according to any one of claims 1 to 3, wherein the base sheet is made of a nonwoven fabric, and stretchability is imparted in the flow direction of the base sheet by the stretching process. A sheet processing apparatus for carrying out the sheet manufacturing method according to claim 1,
A sheet comprising a pair of rolls provided on the peripheral surface portion so that tooth grooves engaged with each other are along the rotation axis direction, and tension applying means for applying tension in the flow direction of the base sheet supplied between the rolls. Processing equipment.   The sheet processing apparatus according to claim 5, further comprising a conveying unit that pulls out and conveys between the rolls while applying a tension in a flow direction of the processed base sheet. The sheet processing apparatus according to claim 5 or 6, further comprising slip prevention means for preventing slippage in a flow direction of the base sheet supplied between the pair of rolls.

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