JP5250406B2 - Sheet processing method and processing apparatus - Google Patents

Description

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

Conventionally, in the manufacture of sanitary products such as disposable diapers and sanitary napkins, heat rolls are often used for joining (seal) between two sheets and cutting sheet materials and elastic members. If the surface temperature is non-uniform, stable joining and cutting become difficult.
As a technique for equalizing the surface temperature of the heat roll, Patent Document 1 considers heat radiation from the end in the axial direction of the roll, and the amount of heat generated by the heater arranged near the end is arranged in the center. It is described that it is larger than the heater.

JP 2006-185696 A

  However, in recent years, high-precision machining is often required, and simply by arranging a heater with a large calorific value at the center as in the technique of Patent Document 1, it is sufficient to meet such a requirement. I can't respond. For example, the surface temperature of the roll fluctuates due to changes in the conditions and environment when sealing or cutting, such as heat dissipation when the roll rotates, heat dissipation from the roll to the sheet material that contacts the roll, heat dissipation by the opposing roll, etc. However, simply placing a heater with a large calorific value at the center may not be able to perform high-precision sealing or cutting under the influence of such small fluctuations.

Therefore, the present invention relates to providing a sheet processing method capable of stably performing various types of processing on a sheet with high accuracy.
The present invention also relates to providing a sheet processing apparatus capable of stably performing heat sealing and / or cutting of an elastic member with high accuracy.

  The present invention is a sheet processing method for performing processing on a sheet between two rolls arranged to face each other, and the processing on the sheet is arranged between a sheet press, a heat seal between sheets, and a sheet. Cutting the elastic member, and controlling the temperature of the outer peripheral portion of at least one of the rolls individually in a plurality of heating regions arranged in the axial direction of the roll while performing the processing on the sheet. The present invention relates to providing a sheet processing method.

  Further, the present invention is a sheet processing apparatus for performing heat sealing between sheets and / or cutting an elastic member disposed between sheets between two rolls arranged to face each other, and at least one of the rolls is Each of the plurality of heating regions arranged in the axial direction of the roll has a temperature sensor, and based on information from each temperature sensor, the temperature of the outer peripheral portion of the roll can be controlled for each heating region. The present invention relates to providing a sheet processing apparatus.

According to the sheet processing method of the present invention, various types of processing on the sheet can be stably performed with high accuracy.
According to the sheet processing apparatus of the present invention, heat sealing and / or cutting of the elastic member can be stably performed with high accuracy.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
First, the sheet processing method and processing apparatus according to the first embodiment of the present invention will be described.
As shown in FIG. 1, the sheet processing apparatus according to the first embodiment of the present invention includes first to third seal rolls 7 </ b> A to 7 </ b> C and an anvil roll 8 disposed to face these seal rolls 7 </ b> A to 7 </ b> C. The heat sealing apparatus 1 is provided with a first sealing process that heats and pressurizes the two sheets A1 and B1 between the first seal roll 7A and the anvil roll 8, and a second seal roll 7B. By sequentially performing the second sealing process for heating and pressurizing between the anvil roll 8 and the third sealing process for heating and pressurizing between the third seal roll 7C and the anvil roll 8 The two sheets A1, B1 are configured to be joined by heat sealing.

  The heat sealing process performed by the heat sealing apparatus 1 of the present embodiment is performed on the diaper continuous body 100 in which the diaper 10 is continuous in the width direction in the production line for continuously manufacturing the pants-type disposable diaper 10 shown in FIG. On the other hand, heat sealing is applied. More specifically, as shown in FIG. 3, the diaper continuous body 100 has a heat seal between the laminated sheet A1 forming the diaper belly side A and the laminated sheet B1 forming the diaper back side B ( It is the process which forms the side seal parts 4 and 4 of the diaper 10 by joining by heat sealing | fusion. Thus, the heat seal between two sheets in the present invention includes a case where two opposing sheets A1 and B1 formed by folding one continuous sheet are joined. Further, each of the two sheets A1 and B1 to be heat sealed may be a single layer structure sheet or a multilayer structure sheet.

The first to third seal rolls 7A to 7C and the anvil roll 8 in the heat sealing apparatus 1 are each driven to rotate in the direction indicated by the arrow P in FIG. In this state, the diaper continuous body 100 is continuously introduced onto the anvil roll 8 by the known belt-type transport unit 11, and the diaper continuous body 100 transported as the anvil roll 8 rotates is The first sealing process by the first seal roll 7A, the second sealing process by the second seal roll 7B, and the third sealing process by the third seal roll 7C are performed in this order. The first to third sealing processes are applied to the same position of the diaper continuous body 100.
The side seal parts 4 and 4 are formed in the diaper continuous body 100 by these sealing processes. And the cutting process which cut | disconnects across the width direction between the adjacent side seal parts 4 and 4 with respect to the diaper continuous body 100 after leaving | separating from on the anvil roll 8 is given.
By performing the sealing process in three stages, heat can be applied to the bonding interface between the sheets A1 and B1 while preventing damage to the sheets A1 and B1 of the workpiece, and reliable sealing can be performed. . Moreover, although the 1st-3rd sealing process may be performed at the same temperature, it is more preferable from the same viewpoint that the temperature is gradually lowered.

  As shown in FIG. 1, seal blocks 70 and 80 are attached to the first to third seal rolls 7 </ b> A to 7 </ b> C and the anvil roll 8, respectively. Two seal blocks 70 of each of the first to third seal rolls 7A to 7C are attached at two equal positions in the circumferential direction of the roll, and the seal block 80 of the anvil roll 8 is disposed at six positions in the circumferential direction of the roll. A total of six are attached. Each seal block 70, 80 has a shape that is long in the axial direction of each roll.

  As shown in FIG. 4, two protruding strips 70 a and 70 b are formed at the tip of the seal block 70 along the roll axis direction. In addition, two protruding strips 80a and 80b are formed at the tip of the seal block 80 along the roll axis direction. As the rolls 7A to 7C and 8 rotate, the ridges 70a and 70b of the seal block 70 and the ridges 80a and 80b of the seal block 80 are periodically opposed to each other as shown in FIG. The sealing material is heated and pressurized between the portion 70a and the ridge portion 80a and between the ridge portion 70b and the ridge portion 80b.

  In the heat seal device 1 of the present embodiment, the temperatures of the outer peripheral portions of the first to third seal rolls 7A to 7C are individually set for each of the plurality of heating regions 7D, 7E, and 7F arranged in the axial direction of the rolls. The two sheets A1 and B1 can be heat sealed while being controlled. Further, the heat sealing device 1 of the present embodiment has two sheets while individually controlling the temperature of the outer peripheral portion of the anvil roll 8 for each of the plurality of heating regions 8D, 8E, 8F arranged in the axial direction of the roll 8. The sheets A1 and B1 can be heat sealed.

As shown in FIGS. 4 and 5, a cartridge heater 91 and temperature sensors (temperature measuring means) 96 to 98 are incorporated in each of the seal blocks 70 and 80.
The heating regions 7D, 7E, and 7F are regions that are set to individually control the temperature by the cartridge heater 91, and the heating regions 8D, 8E, and 8F are also individually controlled by the cartridge heater 91. It is an area set to do.

In this embodiment, as shown in FIG. 3, the heating region 7D of the seal rolls 7A to 7C and the heating region 8D of the anvil roll 8 are in the width direction (roll axis direction) of the portion where the diaper continuous body 100 is subjected to heat sealing. ) Is set to heat and pressurize, and the heating region 7E of the seal rolls 7A to 7C and the heating region 8E of the anvil roll 8 are in the width direction ( It is set to heat and press one end in the roll axis direction), and the heating region 7F of the seal rolls 7A to 7C and the heating region 8F of the anvil roll 8 perform heat sealing processing of the diaper continuous body 100. The other end in the width direction (roll axis direction) of the part is set to be heated and pressurized.
As shown in FIG. 5, the heating region 7D and the heating region 8D, the heating region 7E and the heating region 8E, and the heating region 7F and the heating region 8F are provided at the same position in the axial direction of the roll.
Further, as shown in FIG. 6, the heating area 7E and the heating area 8E are heat-sealed between the sheets A1 and B1 at the arrangement position of the waist elastic member 33 of the diaper continuous body 100, and the heating area 7F and the heating area 8F. Heat seals between the sheets A1 and B1 at the position where the leg elastic member 35 of the diaper continuous body 100 is disposed.
In the present embodiment, the heating regions 7D and 8D are central heating regions, and the heating regions 7E, 7F, 8E, and 8F are side heating regions.

In the present embodiment, as shown in FIG. 1, the diaper continuous body 100 is wound around the anvil roll 8 by 10 degrees or more and conveyed (winding angle θ1 = 10 degrees or more), whereby the diaper continuous body 100 has been described above. The two sheets A1 and B1 are heated in advance and then pressed between the seal blocks 70 and 80, thereby improving the heat-sealing property between the sheets when the side seal portion 4 is formed. The anvil roll 8 is entirely heated by the heating regions 8D, 8E, 8F. When the sheet to be processed is wound around a roll and conveyed, the winding angle θ1 can be, for example, 10 to 300 degrees, and preferably 35 to 225 degrees.
However, if the winding angle θ1 of the two sheets (the sheets A1 and B1 in this embodiment) with respect to the anvil roll 8 is increased, the temperature of the roll 8 is likely to be deprived of heat by a lower temperature sheet in contact therewith, There is a tendency that the temperature of the roll 8, particularly the temperature at the central portion in the axial length direction, tends to decrease.

  In the heat seal device 1 of the present embodiment, the axial temperatures of the outer peripheral portions of the first to third seal rolls 7A to 7C and the anvil roll 8 are set to the heating region 7D so as to eliminate such inconvenience. , 8D, heating regions 7E, 8E, and heating regions 7F, 8F can be individually controlled. More specific description will be given below.

  In the seal blocks 70 and 80 according to the present embodiment, heater fixing holes 92 are formed so as to extend in parallel with the roll axis direction, and the cartridge heater 91 is inserted into and fixed to the fixing holes 92. Yes.

As the cartridge heater 91, a heat-resistant pipe (for example, a heat-resistant stainless steel pipe) has a heating wire (such as a nichrome wire), and the gap between the heating wire and the pipe is excellent in thermal conductivity and insulation (MgO, etc.) ) Or the like embedded in it can be used.
As shown in FIG. 5, the cartridge heater 91 used in the present embodiment has a large heat generating portion 93 having a large watt density at the center in the longitudinal direction, and the amount of heat generated is larger than that of the large heat generating portion 93 before and after that. Two small heat generating portions 94 and 95 are provided.
The cartridge heater 91 has a large heat generating portion 93 located in the heating regions 7D and 8D, and small heat generating portions 94 and 95 located in the portions arranged in the heating regions 7E and 8E and the portions arranged in the heating regions 7F and 8F, respectively. As shown, the seal blocks 70 and 80 are fixed.
The watt density is a calorific value W / cm ² (heater capacity w / (heater diameter cm × heater length cm)) per unit area in the cartridge heater axial direction. The large heat generating portion 93 and the two small heat generating portions 94 and 95 of the cartridge heater 91 used in this embodiment are built in a state in which a heating wire is wound in a spiral shape. The number of turns of the heating wire per axial length of the cartridge heater 91 is different between the two small heat generating portions 94 and 95, whereby the unit area is different between the large heat generating portion 93 and the two small heat generating portions 94 and 95. Per watt density is different.
You may have the structure where the temperature control divided | segmented in one cartridge heater is possible.

In addition, the seal blocks 70 and 80 have the temperatures in the roll axis direction of the outer peripheral portions of the rolls 7A to 7C and 8 separately in the heating regions 7D and 8D, the heating regions 7E and 8E, and the heating regions 7F and 8F, respectively. Temperature sensors 96, 97, and 98 capable of detecting the temperature are provided. Each temperature sensor is provided closer to the roll surface than the cartridge heater 91 in the radial direction of the roll. Various known sensors can be used as the temperature sensor, for example, a thermocouple or the like can be used.
The large heat generating portion 93 and the small heat generating portions 94 and 95 and the temperature sensors 96 to 98 of each cartridge heater are controlled outside the roll through known connection means such as a cord and a rotary connector arranged in the shaft portion of the roll. It is connected to the.
In the present embodiment, in this way, the cartridge heater 91 and the temperature sensors 96 to 98 are arranged on the outer peripheral portions of the rolls 7A to 7C and 8, and the temperatures of the outer peripheral portions of the rolls are arranged in a plurality in the axial direction. It is controlled individually in the heating area.

The control device includes a storage unit, a calculation unit, a display / setting unit, an output unit (interface unit), and the like, all not shown.
When the sheet processing apparatus of the present embodiment is operated, the heating regions 7D to 7F of the first to third seal rolls 7A to 7C and the heating of the anvil roll 8 are based on information obtained from the temperature sensors 96, 97, and 98. The temperature of the outer peripheral part of the roll in each of the regions 8 D to 8 F and the change with time thereof are displayed on the display / setting unit and stored in the storage unit. The storage unit, each heating zone 7D~7F and 8 D to 8 F respective set temperatures, allowed to store the input from the display and setting unit.
During operation, the calculation unit compares the set temperature stored in the storage unit with the actual temperature of each corresponding part for each of the heating regions 7D to 7F and 8D to 8F, and the set value is greater than the actual value. If it is high, issue a command to the output unit to increase the actual temperature, and if the set value is lower than the actual value, lower the actual temperature (for example, to stop the heating of the heater) to the output unit If the set value and the actual value are the same (if the difference is equal to or less than the predetermined value), the command is issued to the output unit so as to maintain the actual temperature. The command to the output unit may be digital information or the like in addition to current and / or voltage and change. The output section supplies power to the large heat generating section and / or small heat generating section of the cartridge heater according to the content of the command, stops it, or increases or decreases the current or voltage of the supplied power. Keep it in a state. Predictive control such as stopping the supply of power before reaching the set temperature may be performed based on past temperature control and history data of temperature change at that time.

In the sheet processing apparatus and the sheet processing method using the same according to the first embodiment, the outer peripheries of the first to third seal rolls 7A to 7C and the anvil roll 8 are thus based on the information from the temperature sensor. The heat seal process for forming the side seal part 4 is performed while individually controlling the temperature in the roll axis direction of each part for each of the heating regions 7D to 7F and 8D to 8F.
Therefore, it is possible to prevent unintended temperature unevenness occurring in the first to third seal rolls 7A to 7C and / or the anvil roll 8, and the diaper continuous body 100 has a side whose peel strength is controlled with high accuracy. The seal portion 4 can be formed stably, and thus a high-quality and uniform pant-type disposable diaper can be stably produced continuously.

In the present embodiment, each of the first to third seal rolls 7A to 7C is individually temperature-controlled so that each of the heating regions 7D to 7F has a constant set temperature set for each roll. Yes. In the present embodiment, the anvil roll 8 also controls the temperature of each of the heating regions 8D to 8F separately so as to have a constant set temperature. By controlling individually, the temperature of each heating area | region 7D-7F and 8D-8F can be efficiently maintained uniformly, even if the method of taking heat differs for every heating area | region. As an example of the set temperature for each roll, the set temperature of the first seal roll 7A is 170 ° C, the set temperature of the second seal roll 7B is 170 ° C, the set temperature of the third seal roll 7C is 150 ° C, The set temperature of the anvil roll 8 is 180 ° C.

  In the diaper continuous body 100, one or both of the sheets A1 and B1 that are heat-sealed, as shown in FIG. 6, have a plurality of regions 12, 13, and 14 in which the number of stacked sheets is different in the axial direction of the roll. When it has, a heating area | region can be set corresponding to each area | regions 12-14, and an area | region with many lamination layers can also be heated at high temperature from an area | region with few lamination | stacking numbers. Thereby, desired joint strength can be obtained for the entire seal portion. In the example illustrated in FIG. 6, the number of sheets stacked in the regions 12 to 14 is three, three, and two in order, and it is preferable to heat the regions 12 and 13 at a higher temperature than the region 14.

Next, a sheet processing method and processing apparatus according to a second embodiment of the present invention will be described.
As shown in FIGS. 7 to 9, the sheet processing apparatus according to the second embodiment of the present invention includes a pattern roll 7 and an anvil roll 8 ′ arranged to face the pattern roll 7. This is a cutting device 1 ′ that cuts the elastic members 34 to 36 introduced between the two sheets 31 and 32 between the convex portion and the anvil roll 8 ′. In the sheet processing method according to the second embodiment of the present invention, the sheet is introduced into the two sheets 31 and 32 between the convex portion of the pattern roll 7 and the anvil roll 8 ′ using the cutting device 1 ′. The elastic members 34 to 36 are cut.

  FIG. 7 shows an outer packaging material continuous body 3 ′ used as the outer packaging material 3 of the pants-type disposable diaper 10 shown in FIG. 2 by using the cutting device 1 ′ (sheet processing device) of the second embodiment of the present invention. The production is shown.

  A pants-type disposable diaper 10 shown in FIG. 2 includes an absorbent main body 2 and an outer packaging material 3 that is positioned on the non-skin contact surface side of the absorbent main body 2 and fixes the main body 2 as shown in FIG. And. The diaper 10 has an abdominal side A disposed on the abdomen side of the wearer when worn, a back side B disposed on the back side of the wearer, and a crotch C disposed therebetween. Both side edges of the side part A and the back side part B are joined together to form a pair of side seal parts 4, a waist opening part 5, and a pair of leg opening parts 6 and 6.

  As shown in FIG. 10 (b), the absorbent main body 2 includes a liquid-permeable top sheet 21, a liquid-impermeable or water-repellent back sheet 22, and a liquid retaining property disposed between both sheets 21 and 22. The surface on the back sheet 22 side (non-skin contact surface side) of the absorbent main body 2 is fixed to the outer packaging material 3. In FIG. 10, the absorbent main body 2 and the outer packaging material 3 in the diaper 10 are shown separately, and the portion indicated by reference numeral 2 ′ in FIG. It is a part. Side cuffs 24 made of a liquid-resistant or water-repellent and breathable material are provided on both sides in the longitudinal direction of the absorbent main body 2. The side cuff 24 includes an elastic member 24a, and forms a three-dimensional gather by contraction of the elastic member 24a. As the absorptive core 23, for example, a core composed of a fiber material such as pulp fiber and superabsorbent polymer particles and covered with tissue paper (not shown) is used.

The outer packaging material 3 in the diaper 10 includes elastic members 33, 34, 35 and 36 between the outer layer sheet 31 and the inner layer sheet 32.
The outer packaging material 3 includes a waist part elastic member 33 and a waistline elastic member 34 which are respectively disposed along the width direction on the stomach side A and the back side B of the diaper 10. Further, the outer packaging material 3 has first and second leg elastic members 35 and 36 at the periphery of the leg opening 6.

  The waist elastic member 33 is disposed on the waist U that is located outward from both ends in the longitudinal direction of the absorbent main body 2 in the longitudinal direction of the unfolded diaper 10 (see FIG. 10). The member 34 is arranged on the waistline portion D located inward (in the crotch part) from both ends in the longitudinal direction of the absorbent main body 2 in the longitudinal direction of the unfolded diaper 10. The first leg elastic member 35 is disposed from the abdomen A to the crotch C, and the second leg elastic member 36 is disposed from the back B to the crotch C.

  The elastic members 33, 34, 35, and 36 in the diaper 10 are fixed in an extended state via an adhesive between the outer layer sheet 31 and the inner layer sheet 32. By contracting these, the waist portion U and the waistline Waist gathers G2, waistline gathers G1, G1, and leg gathers G3 are formed at the periphery of the part D and the leg opening 6.

On the other hand, the waistline elastic member 34 in each of the abdominal side A and the back side B is cut at a portion overlapping the absorbent main body 2, and the absorbent main body 2 is prevented from being greatly contracted in the width direction. Thereby, the absorptive main body 2 fits a wearer's skin in a state with few wrinkles, and favorable leak prevention property and absorption performance are obtained. Also, the appearance is good.
Moreover, the 1st and 2nd leg part elastic members 35 and 36 are each cut | disconnected in the width direction center part of the crotch part C, and are divided | segmented into right and left. Thereby, the both sides of the absorbent core 23 in the crotch part C rise upward and are easily deformed into a concave shape, thereby improving leakage prevention performance and appearance.

  The pattern roll 7 of the sheet processing apparatus 1 ′ of the second embodiment is a metal-made, cylindrical roll, and has a leg elastic member cutting part 72 and a waistline elastic member cutting part 73 on its peripheral surface. doing. The anvil roll 8 ′ is a receiving roll for the pattern roll 7 and is made of metal and has a cylindrical shape, and its peripheral surface 81 is a smooth surface.

  As shown in FIGS. 8 and 9, the leg elastic member cutting part 72 is provided in the central part 7 </ b> M of the pattern roll 7 in the axial direction. In the leg elastic member cutting part 72, a plurality of convex parts 72a for cutting the leg elastic member are protrudingly provided on the surface 71 of the cylindrical roll body. As shown in FIG. 7, the plurality of convex portions 72 a for cutting the leg elastic members are first and second legs that are continuously introduced between the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32, respectively. The part elastic members 35 and 36 are cut by pressing between the convex portion 72a and the peripheral surface 81 of the anvil roll 8 ′ at a portion corresponding to the central portion in the width direction of the crotch part C of the diaper 10. .

As shown in FIGS. 8 and 9, the waistline elastic member cutting portion 73 is provided on each of the outer portions 7E and 7E located on both outer sides of the central portion 7M in the axial length direction of the pattern roll 7. Yes. The waistline elastic member cutting part 73 is provided with a plurality of protrusions 73a for cutting the waistline elastic member protruding on the surface 71 of the cylindrical roll body. The convex portions 73 a are arranged in a state of being distributed in the axial direction and the circumferential direction of the roll 7 . The convex portions 73 a are formed by connecting the plurality of waistline elastic members 34 continuously introduced between the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32, respectively, to the stomach side A and the back side B of the diaper 10. In the region where the absorbent main body 2 is stacked, the pressure is cut between the convex portion 73a and the peripheral surface 81 of the anvil roll 8 ′.
7 and 10, a portion pressurized by the convex portion 73a for cutting the waistline elastic member, that is, a portion where the waistline elastic member is cut is indicated by reference numeral 73b, and the first and second legs are shown in FIG. A portion pressed by the convex portion 72a for cutting the partial elastic member, that is, a portion where the leg elastic member is cut is indicated by reference numeral 72b.

  The central portion 7M in the axial direction of the pattern roll 7 is a portion facing the central portion 8M in the axial direction of the anvil roll 8 ′ when combined with an anvil roll 8 ′ described later. 7E and 7E, when combined with an anvil roll 8 ′, which will be described later, are opposed to the outer portions 8E and 8E located on both outer sides of the central portion 8M in the axial direction of the anvil roll 8 ′. It is.

The convex portions 72 a and 73 a in the leg elastic member cutting portion 72 and the waistline elastic member cutting portion 73 are designed such that the distances between the respective tips and the axis 7 </ b> C of the pattern roll 7 are equal. Further, the anvil roll 8 ′ has a uniform diameter in the axial direction, and the distance between the outer peripheral surface 81 facing each convex portion of the pattern roll 7 and the axial center line 8C is equal.
Therefore, the clearance (separation distance) between the convex portions 72a and 73a of the pattern roll 7 and the outer peripheral surface 81 of the anvil roll 8 ′ is constant in the design of the roll.
However, when a temperature difference in the roll axis direction occurs in the outer periphery of the pattern roll 7 or the anvil roll 8 ′, particularly the anvil roll 8 ′, a difference occurs in the degree of expansion in the radius or diametric direction of each part. There will be a difference in clearance.

Similarly to the anvil roll 8 in the sheet processing apparatus 1 of the first embodiment, the sheet processing apparatus 1 ′ of the second embodiment sets the temperature in the roll axial direction of the outer peripheral portion of the anvil roll 8 ′ to the center in the axial direction. The part 8M and the outer parts 8E and 8E can be individually controlled. In the sheet processing method of the second embodiment, the sheet processing apparatus 1 ′ is used to change the temperature in the roll axial direction of the outer peripheral portion of the anvil roll 8 ′ to the central portion 8M in the axial direction and both outer portions. The sheet is processed while being individually controlled by 8E and 8E.

  In the second embodiment, the laminated body 3 ″ obtained by laminating the belt-like outer layer sheet 31 and the belt-like inner layer sheet 32 with the elastic members 33 to 36 interposed therebetween is wound around the anvil roll 8 ′ by 10 degrees or more and conveyed [ The winding angle θ1 (see FIG. 1) = 10 degrees or more], and pressurizing with the convex portions 72a and 73a of the leg portion elastic member cutting portion 72 and the waistline elastic member cutting portion 73, thereby the first and second legs The part elastic members 35 and 36 and the waistline elastic member 34 are simultaneously cut.

  As shown in FIG. 8, a plurality of heater fixing holes 92 are formed in the anvil roll 8 ′ in the sheet processing apparatus 1 ′ of the second embodiment so as to extend in parallel with the axial direction of the roll 8 ′. The cartridge heater 91 is inserted and fixed in each of the fixing holes 92. A plurality of cartridge heaters 91 are provided at intervals in the circumferential direction of the roll 8 ′, and each cartridge heater 91 is provided near the outer peripheral surface of the roll 8 ′ in the radial direction of the anvil roll 8 ′. ing. For example, about 3 to 30 cartridge heaters 91 can be arranged at intervals in the circumferential direction of the roll 8 ′. In the example shown in FIG. 8, eight cartridge heaters 91 are provided at eight equal positions in the circumferential direction of the roll 8 '. A heat generating portion 93 having a large heat generation amount is provided in the central portion 8M in the axial direction of the anvil roll 8 ′, and heat generating portions 94 and 95 having a small heat generation amount are provided in the outer portions 8E and 8E of the anvil roll 8 ′, respectively. Is provided.

Further, the anvil roll 8 ′ has temperature sensors 96, 97, 98 that can detect the temperature in the roll axis direction of the outer peripheral portion of the roll 8 ′ separately at the central portion 8M and the outer portions 8E, 8E. Is provided. Each temperature sensor is provided at a central position between two cartridge heaters adjacent in the circumferential direction of the roll 8 ′, and the depth from the outer circumferential surface 81 in the radial direction of the roll is substantially the same as that of the cartridge heater. Various known sensors can be used as the temperature sensor, for example, a thermocouple or the like can be used.
The large heat generating portion 93 and the small heat generating portions 94 and 95 and the temperature sensors 96, 97, and 98 of each cartridge heater are rolled through a known connection means such as a cord arranged in the shaft portion of the roll 8 ′ or a rotary connector. It is connected to the control device outside 8 '. The temperature control of each of the central portion 8M and the outer portions 8E and 8E in the anvil roll 8 ′ can be similarly controlled using a control device having the same function as the control device of the sheet processing apparatus of the first embodiment. .

  In the embodiment shown in FIGS. 8 and 9, the pattern roll 7 is also provided with a heater fixing hole 92 similar to the anvil roll 8 '. However, since the pattern roll 7 is less affected by the sheet temperature than the anvil roll 8 ', in the second embodiment, the cartridge heater 99 used for the putter roll has a uniform calorific value in the longitudinal direction. is there. However, instead of this, the temperature in the roll axis direction of the outer peripheral portion of the pattern roll 7 can also be individually controlled at the central portion 7M and the both end portions 7E and 7E, similarly to the anvil roll 8 ′. .

Also in the sheet processing method of the second embodiment , the temperature sensor 96 that can detect the temperature in the roll axis direction of the outer peripheral portion of the anvil roll 8 ′ separately at the central portion 8M and the outer portions 8E and 8E . Based on the information from 97 and 98, the temperature in the roll axial direction of the outer peripheral portion of the anvil roll 8 ′ is individually controlled by the central portion 8M and the outer portions 8E and 8E of the roll.
Therefore, for example, the temperature in the roll axial direction of the outer peripheral portion of the anvil roll 8 ′ can be kept constant at the central portion 8M and the outer portions 8E, 8E of the roll, and thereby the convexity of the pattern roll 7 can be maintained. parts 72a, 73b and with the anvil roll 8 'a clearance between (the circumferential surface 81) kept constant, the cutting and the leg elastic members waist elastic member 34 by the convex portion 73 a of the waist elastic member cutting unit 73 The leg elastic members 35 and 36 can be simultaneously cut by the convex portion 72a of the cutting portion 72.
In this way, according to the second embodiment, the cutting of the waistline elastic member 34 and the cutting of the leg elastic members 35 and 36 can be stably performed with high accuracy, respectively. It is also possible to suppress damage to the outer layer sheet 31 and / or the inner layer sheet 32 while reliably cutting the 34, 35 and 36.

When forming the pants-type disposable diaper 10, as the forming material of the outer packaging material 3, that is, as the outer layer sheet 31 and the inner layer sheet 32, various sheet materials conventionally used for this type of article can be used without particular limitation. it can. When the sheet material is a nonwoven fabric, it is preferably a single-layer sheet or a laminated sheet made of an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, or the like from the viewpoint of flexibility and the like. In addition, the nonwoven fabric used as the outer layer sheet 31 and the inner layer sheet 32 is preferably a water-repellent nonwoven fabric from the viewpoint of further preventing liquid leakage.
As a forming material of the elastic members 33 to 36, various known elastic materials used for absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member, a thread-like (thread rubber etc.) or string-like (flat rubber etc.) cross section having a rectangular, square, circular, polygonal shape, or a multifilament type thread-like one can be used. .

The above-described pants-type disposable diaper 10 is a conventional so-called transverse flow system except that the outer packaging material continuous body 3 ′ obtained by performing the above-described processing on the outer layer sheet 31 and the inner layer sheet 32 with an elastic member interposed therebetween is used. It can be manufactured in the same manner as in the manufacturing method for pants-type disposable diapers.
For example, as shown in FIG. 11, both side portions of the outer packaging material continuous body 3 ′ after fixing the absorbent main body 2 are folded back so as to cover both end portions of the absorbent main body 2, After fixing both sides of the outer packaging material continuous body, the outer packaging material continuous body 3 ′ is folded in two together with the absorbent main body 2.
And after forming the side seal parts 4 and 4 in the obtained diaper continuous body 100, it divides | segments into each diaper, and the underpants type disposable diaper 10 of the structure mentioned above is obtained. The removal of the trim 3S for forming the leg opening may be performed either before or after the absorbent main body 2 is fixed to the outer packaging material continuous body 3 ′. The method and apparatus of the first embodiment can also be used for forming the side seal portions 4 and 4.

The present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention.
For example, in the first embodiment described above, heat sealing between two sheets is performed between the first to third seal rolls 7A to 7C and the anvil roll 8, and in the second embodiment described above. The elastic members 34 to 36 introduced between the two sheets were cut between the convex portion of the pattern roll 7 and the anvil roll 8 ′, but the sealing convexity was formed on the peripheral surface of one roll. It is also possible to form a part and a convex part for cutting and simultaneously perform heat sealing of the two sheets and cutting of the elastic member introduced between the two sheets. Further, when performing the heat sealing between the two sheets and the elastic member introduced between the two sheets between the convex portion of the pattern roll 7 and the anvil roll 8 ′, The place where the elastic member is cut can be arbitrarily set.

  In the first embodiment described above, the first to third sealing rolls are used. However, heat sealing may be performed using one or two sealing rolls and an anvil roll. Further, instead of pressurizing the sheet between the pattern roll 7 or the seal rolls 7A to 7C and the anvil roll 8 ', the sheet is pressed between a pair of rolls having a smooth outer peripheral surface. Also good.

Further, the two sheets may be non-woven fabric, non-woven fabric and woven fabric, paper or resin film. Further, it is possible to overlap two sheets and join other sheets together, or to cut an elastic member disposed between any one of the three or more stacked sheets.
Moreover, in addition to the two heating regions in which the temperature can be individually controlled, a heating region in which only one of them can be controlled may be provided. For example, when a central heating region and side heating regions located on both sides thereof are provided in the axial direction of the roll as the heating region, the temperature in the roll axial direction of the outer peripheral portion of the roll in the central heating region and both side heating regions. If both can be controlled individually, both side heating regions may be capable of controlling the temperature only integrally.
In addition, separate cartridge heaters may be used for each heating region, or for some heating regions and other heating regions for the seal roll, heat roll, and anvil roll.

  Further, the outer peripheral portion of one or both of the two rolls that perform various processing on the sheet is composed of a plurality of divided blocks arranged in the axial direction of the roll, and is formed by one divided block. It is also preferable to individually control the temperature of the outer periphery of the roll and the outer periphery of the roll formed by other divided blocks as different heating regions. For example, FIG. 12 is a view showing a seal block that can be used as a seal block for the seal rolls 7A to 7C and the anvil roll 8 of the first embodiment. The seal block 70 ′ shown in FIG. 12 is composed of three metal divided blocks 74 to 76 arranged in the roll axis direction, and has a slight gap between adjacent divided blocks. A heat insulating material can also be arranged in the gap. In the divided blocks 74 to 76, temperature sensors 96 to 98 and independent heater heating portions 93 to 95 are arranged for each divided block. The independent heat generating portions 93 to 95 of each divided block can control heat generation independently of each other. This seal block is used as the seal block of the seal rolls 7A to 7C or the anvil roll 8 of the first embodiment, so that the divided blocks 74 to 76 are a plurality of heating regions 7D to 7F or 8D arranged in the roll axis direction. Can function as ~ 8F.

  In this way, the outer peripheral portion of the roll is composed of a plurality of divided blocks arranged in the axial direction, and by controlling heat conduction between the divided blocks, temperature control for each of the different heating regions 7D to 7F or 8D to 8F can be performed. It is possible to carry out with higher accuracy by suppressing the influence of other regions.

  Examples of the pant-type absorbent article include a pant-type sanitary napkin in addition to a pant-type disposable diaper. Further, various known heaters may be used instead of the cartridge heater. Moreover, as a pants-type wearing article, a diaper cover, pants, sanitary shorts, etc. can be manufactured in addition to a pants-type absorbent article.

FIG. 1 is a diagram illustrating a state in which heat sealing processing between two sheets is performed using the sheet processing apparatus according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a pants-type disposable diaper manufactured by forming a side seal portion by the sheet processing apparatus and processing method of the first embodiment. FIG. 3 shows a sealing process for forming a side seal portion with respect to a diaper continuous body in a production line for a pants-type disposable diaper, and the diaper continuous body is cut across the width direction between adjacent side seal portions. It is a figure which shows typically the cutting process used as each diaper. FIG. 4 is a schematic cross-sectional view showing a cross section orthogonal to the roll axis direction of the seal block of each of the first seal roll and the anvil roll in the apparatus of FIG. 1. FIG. 5 is a schematic cross-sectional view showing a cross section parallel to the roll axis direction of the seal block of each of the first seal roll and the anvil roll in the apparatus of FIG. 1. FIG. 6 is a schematic view showing a cross section of a portion of the diaper continuous body subjected to heat sealing. FIG. 7 is a diagram illustrating a state in which an elastic member disposed between two sheets is cut using the sheet processing apparatus according to the second embodiment of the present invention. FIG. 8 is a perspective view showing a pattern roll and an anvil roll in the apparatus of FIG. FIG. 9 is a sectional view taken along the axial direction of the pattern roll and the anvil roll shown in FIG. FIG. 10 is a plan view showing the diaper shown in FIG. 2 separated into an outer packaging material and an absorbent main body, FIG. 10 (a) is a diagram showing the outer packaging material in an unfolded state, and FIG. It is a figure which shows a partially broken absorbent main body. FIG. 11 is a conceptual diagram focusing on the steps after the outer packaging material continuum manufacture in the manufacturing method of the pants-type disposable diaper shown in FIG. 2 . It is a schematic cross section which shows the cross section parallel to the roll axial direction of the seal block of another form which can be used as a seal block of each of the 1st seal roll and the anvil roll in the apparatus of FIG.

Explanation of symbols

1 Heat sealing device (sheet processing device)
1 'Cutting device (sheet processing device)
DESCRIPTION OF SYMBOLS 10 Pants type disposable diaper 2 Absorbent main body 3 Outer packaging material 31 Outer layer sheet 32 Inner layer sheet 33 Waist part elastic member 34 Girth part elastic member 35 1st leg part elastic member 36 2nd leg part elastic member 4 Side seal part 5 Waist opening part 6 Leg opening 7 Pattern roll 7A-7C Seal roll 7D-7F Heating area 72 Leg elastic member cutting part 73 Girth part elastic member cutting part 8, 8 'Anvil roll 8D-8F Heating area 91 Cartridge heater 93 High heat generating part 94 , 95 Low heat generation part 96-98 Temperature sensor (temperature measuring means)
100 diaper continuum

Claims (4)

A sheet processing method for processing a sheet between two rolls arranged opposite to each other,
The processing on the sheet is at least one of sheet pressing, heat sealing between sheets, and cutting of an elastic member disposed between the sheets,
The temperature of the outer peripheral portion of at least one roll, while individually controlling a plurality of heating regions arranged in the axial direction of the roll, have rows the processing to the sheet,
One or both of the rolls are composed of a plurality of divided blocks in which the outer peripheral portion of the roll is aligned in the axial direction of the roll, and the roll outer peripheral portion formed by one divided block and the other divided blocks A sheet processing method in which the temperature of the formed roll outer periphery is individually controlled as a different heating region .   Measuring the temperature of the outer periphery individually in a plurality of heating regions arranged in the axial direction of the roll, and based on the temperature measurement results of each heating region, control the temperature of the heater disposed inside the roll of each heating region, The sheet processing method according to claim 1.   As the heating region, a central heating region and side heating regions located on both sides thereof are provided in the axial direction of the roll, and the temperature of the outer periphery of the roll is individually controlled in the central heating region and both side heating regions. The sheet processing method according to claim 1 or 2. A sheet processing method for processing a sheet between two rolls arranged opposite to each other,
The processing on the sheet is at least one of sheet pressing, heat sealing between sheets, and cutting of an elastic member disposed between the sheets,
The temperature of the outer peripheral portion of at least one roll, while individually controlling a plurality of heating regions arranged in the axial direction of the roll, have rows the processing to the sheet,
The said process with respect to the said sheet | seat is the heat seal process which forms the side seal part of an underpants type wearing article, and at least one of the two sheets heat-sealed differs in the axial direction of a roll. A method for processing a sheet having the following area .

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