JP2020066484A - Manufacturing apparatus and manufacturing method of bifold sheet member - Google Patents

Abstract

To provide a manufacturing apparatus enabling a bifold sheet member to be obtained in which a strip-shaped sheet member is folded in half and also enabling a position of the bifold sheet member led out of a twisting part to be stabilized.SOLUTION: A bifold sheet member manufacturing apparatus 10 of the present invention includes: a folding part 20 at which lateral side regions 1s on both sides in a width direction X of a strip-shaped sheet member 1 being conveyed are bent up in a vertical direction Z, the sheet member 1 is folded in half along a longitudinal direction Y, and a bifold sheet member 2 is formed; and a twisting part 40 in which the bifold sheet member 7 is twisted around an axis that is determined with a direction along the conveying direction Y as the axial direction. The bifold sheet member manufacturing apparatus has a clamping part 30 for clamping the bifold sheet member 2 between the folding part 20 and the twisting part 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a folded sheet member.

  In the manufacturing process of various products using sheet-shaped members, for example, sanitary napkins, absorbent articles such as disposable diapers, sanitary items such as masks, heating tools such as disposable warmers, in the manufacturing process of belt-shaped sheet member, It may be folded back at a predetermined portion in the width direction and used in the subsequent steps.

  Patent Document 1 discloses an apparatus for manufacturing a disposable wearing article, which includes a double-folding portion that folds a sheet into two together with an absorber, and a twisting portion that twists the double-folded sheet from a vertical orientation to a horizontal orientation. Is disclosed.

  Further, in Patent Document 2, a guide member having a product conveying surface that continuously changes from a planar shape to a center-folded shape is provided, and a feed roller provided on the center-folded side and a feed roller provided on the plane side are provided. A folding device is disclosed in which a pair of conveyor belts are wound around in a twisted state, and the conveyor surface of each conveyor belt is aligned with the product conveyor surface of a guide member. The document also discloses that a folding device folds a product such as tissue paper in half and then a direction changing device rotates the product in a vertical position to a horizontal position.

Japanese Patent No. 6177926 Japanese Utility Model Publication No. 6-40203

  However, in the devices described in Patent Document 1 and Patent Document 2, from the time the sheet member being conveyed passes through the portion where the sheet member is folded in half to the time when the sheet member is introduced into the portion where the posture of the sheet member is rotated. In addition, bending of the conveyed sheet member is likely to occur. As a result, after the sheet member is rotated, the sheet member is arranged at a position different from the position where it should be originally arranged, and for example, the subsequent manufacturing process such as formation of a joint portion may not be successfully performed.

  Therefore, an object of the present invention is to provide a manufacturing apparatus and a manufacturing method for a bifold sheet member that can solve the drawbacks of the prior art.

  According to the present invention, a double-folded portion is formed in which side regions on both sides in the width direction of a belt-shaped sheet member to be conveyed are vertically raised and the sheet member is folded in two along the longitudinal direction to form a folded sheet member. And a twisting portion that twists the half-folded sheet member around the axis while transporting the half-folded sheet member, and the half-folded sheet member is provided between the half-folded portion and the twisted portion. The present invention provides an apparatus for manufacturing a half-folded sheet member, which has a sandwiching portion for sandwiching.

  Further, according to the present invention, the side portions on both sides in the width direction of the belt-shaped sheet member to be conveyed are vertically raised, and the sheet member is folded in two along the longitudinal direction to form a folded sheet member. And a twisting step of twisting the half-folded sheet member around an axis while transporting the half-folded sheet member with the direction along the transport direction as an axial direction, and the half-folded sheet is interposed between the half-folding step and the twisting step. Provided is a method for manufacturing a bi-folded sheet member, which has a nipping step for nipping a member, and which has a method for manufacturing a bi-folded sheet member.

According to the apparatus for manufacturing a half-folded sheet member of the present invention, a half-folded sheet member obtained by folding a strip-shaped sheet member in two can be obtained, and the position of the half-folded sheet member led out from the twisted portion can be stabilized. it can.
According to the method for manufacturing a half-folded sheet member of the present invention, a half-folded sheet member obtained by folding a strip-shaped sheet member in two can be obtained, and the position of the half-folded sheet member after the twisting step can be stabilized.

FIG. 1 is a perspective view showing a first embodiment of the manufacturing apparatus of the present invention. FIG. 2 is a perspective view showing a second embodiment of the manufacturing apparatus of the present invention. FIG. 3A is a perspective view showing another form of the sandwiching unit according to the manufacturing apparatus of the present invention, and FIG. 3B is a plan view of the sandwiching unit shown in FIG. 3A.

Hereinafter, the apparatus for manufacturing a folded sheet member according to the present invention will be described based on its preferred embodiments with reference to the drawings. FIG. 1 shows a first embodiment of an apparatus for manufacturing a folded sheet member according to the present invention. The manufacturing apparatus 10 shown in the figure includes a half-folded portion 20, a sandwiching portion 30, and a twisting portion 40 in this order from the upstream side to the downstream side of the manufacturing process.
In the following description, unless otherwise specified, the transport direction MD of the sheet member 1 and the half-folded sheet member 2 is the same as the longitudinal direction Y of the sheet member 1 and the half-folded sheet member 2, and the sheet member 1 The width direction X is the same as the direction orthogonal to the transport direction MD of the sheet member 1.

  The two-folded portion 20 of the manufacturing apparatus 10 is a portion for folding the conveyed belt-shaped sheet member 1 in two along the longitudinal direction Y thereof, and the belt-shaped sheet member 1 continuously conveyed from the upstream side thereof is The side regions 1s, 1s on both sides in the width direction X are folded in two so as to rise in the vertical direction Z. The half-folded portion 20 has a half-folded guide 21. The half-fold guide 21 comes into contact with the central region 1c in the width direction of the belt-shaped sheet member 1 that is continuously conveyed from above.

  As shown in FIG. 1, the bi-fold guide 21 has an inverted trapezoidal shape in a side view, and has an upper edge 21a and a lower edge 21b located vertically in the vertical direction Z. Further, the bi-fold guide 21 is arranged such that its main surface is along the vertical direction Z. At least the lower end edge 21b of the half-fold guide 21 is arranged so as to be able to contact the belt-shaped sheet member 1 to be conveyed in the central region 1c thereof, whereby the contact portion between the sheet member 1 and the half-fold guide 21. With the base point as the base point, the sheet member 1 is folded in two, and the two-folded sheet member 2 in which the side regions 1s that are raised along the vertical direction Z face each other can be formed. The double-folding guide 21 has a taper shape in which the length in the width direction X gradually decreases from the upper end edge 21a in the vertical direction Z toward the lower end edge 21b in a cross-sectional view orthogonal to the transport direction Y of the sheet member 1. It is preferable. Further, the half-fold guide 21 may have a tapered shape only on the lower end edge 21b side that contacts the sheet member 1.

  From the viewpoint of preventing unintended breakage of the sheet member 1 due to friction between the sheet member 1 and the half-fold guide 21, the half-fold guide 21 is subjected to a friction reduction treatment on the surface of the portion in contact with the sheet member 1. It is preferably applied. Examples of the friction reducing treatment include surface treatment such as alumite treatment, metal plating treatment, and fluororesin coating. From the same viewpoint, it is preferable that the end of the lower end edge 21b of the half-fold guide 21 on the upstream side in the transport direction of the sheet member 1 is rounded in a side view.

  It is preferable that the half-folded portion 20 of the manufacturing apparatus 10 has a side area rising portion (not shown) in addition to the half-folded guide 21. The side area rising portion can be configured by, for example, a pair of guide rolls arranged so as to contact both side areas 1s, 1s of the sheet member 1. By contacting the side area 1s of the sheet member 1 with a guide roll or the like of the side area rising portion, the side area 1s can be guided to rise upward in the vertical direction Z.

  Further, the half-folded portion 20 preferably includes a position adjusting mechanism (not shown) capable of adjusting the position of the half-folded guide 21. The position adjusting mechanism is connected to the half-fold guide 21, and is capable of moving the half-fold guide 21 in the front-back direction along the longitudinal direction Y and in the vertical direction along the vertical direction Z. By pressing or separating the sheet member 1, the degree of tension applied to the sheet member 1 can be adjusted. As the position adjusting mechanism, for example, a jack, an air cylinder, a hydraulic cylinder, a ball screw, or the like can be used, and the position of the folding guide 21 can be manually or automatically adjusted using these. With such a configuration, the contact position between the sheet member 1 and the half-fold guide 21 can be adjusted to an appropriate position in accordance with the unintentional conveyance shake of the sheet member 1 and the like. As a result, the sheet member 1 can be folded in two more effectively, and the folded sheet member 2 can be formed more efficiently.

  The sandwiching portion 30 of the manufacturing apparatus 10 is a portion that sandwiches the half-folded sheet member 2 formed by the half-folding portion 20, and the sandwiching portion 30 has a pair of sandwiching rolls 31, 31. The nipping roll 31 is arranged so as to contact the side surface 2s of the half-folded sheet member 2, and the pair of nipping rolls 31, 31 is arranged so as to sandwich the half-folded sheet member 2 folded in between. . The sandwiching roll 31 is arranged so that its axial direction is along the vertical direction Z. The axial direction of the sandwiching roll 31 may be parallel to the vertical direction Z or may be inclined with respect to the vertical direction Z. The nipping roll 31 may be a driven roll that rotates in contact with the moving half-folded sheet member 2 or may be a drive roll that rotates by receiving power from a drive source (not shown). The sandwiching portion 30 is a sandwiching member such as a pair of sandwiching rolls 31 and is preferably capable of pressing the folded sheet member 1 from a direction intersecting the vertical direction, more specifically, both sides in the horizontal direction. . The distance between the pair of nipping rolls 31 is preferably equal to or less than the thickness of the half-folded sheet member 2, and the half-folded sheet member 2 is smoothly introduced between the pair of nipping rolls 31 so that the two-folded sheet member 2 is vertically aligned. From the viewpoint of preventing run-out, it is more preferably set to 20% or more and 100% or less with respect to the thickness of the bifold sheet member 2, and further preferably set to 50% or more and 100% or less with respect to the thickness of the bifold sheet member 2. To do. The thickness of the half-folded sheet member 2 is measured by a contact-type constant pressure thickness meter. When the thickness of the half-folded sheet member 2 is not uniform and the half-folded sheet member 2 has the maximum thickness which is the maximum thickness of the sheet member 2, the maximum thickness dimension is defined as the thickness of the half-folded sheet member 2. To do.

The twisting portion 40 is a portion that twists the half-folded sheet member 2 around its axis with the direction along the transport direction Y as the axial direction. More specifically, in the twisting portion 40, as shown in FIG. 1, the half-folded sheet member 2 is changed from a state in which the side surfaces 2s on both sides thereof face both sides in the horizontal direction to a state in which the side surfaces 2s face vertically. So that it is rotated 90 degrees around the axis along the transport direction Y.
The twisting portion 40 has a pair of an upstream vertical guide roll 41 extending in the vertical direction Z, a downstream horizontal guide roll 42 extending in the width direction X, and an endless belt 43, respectively. Specifically, the endless belt 43 is stretched over one of the pair of vertical guide rolls 41, 41 and one of the pair of horizontal guide rolls 42, 42, and the other end of the pair of vertical guide rolls 41, 41. An endless belt 43 is stretched over the other of the pair of horizontal guide rolls 42, 42.

  The manufacturing apparatus 10 may include a processing section that performs various kinds of processing such as a joining section and a cutting section (not shown) on the downstream side of the twisting section 40. The cutting section may be configured by, for example, a cutter roll and an anvil roll arranged to face each other.

According to the manufacturing apparatus 10 of the first embodiment, the holding unit 30 is provided between the half-folding unit 20 and the twisting unit 40, and the two-fold sheet member 2 is sandwiched by the holding unit 30 to be folded in two. The sheet member 1 and the half-folded sheet member 2 are effectively restrained from bending vertically between the upstream end of the half-folding guide 21 and the twisting portion 40, and vertically shifting their positions. The vertical position of the double-folded sheet member 2 when it is introduced into the twisted portion 40 is changed, or the twisted portion is partially bent in the vertical direction and partially twisted or bent. It is possible to effectively suppress the introduction into the 40. As a result, the position of the double-folded sheet member 2 drawn out from the twisting portion 40 in the direction intersecting the vertical direction, preferably the position in the horizontal direction is changed, or the double-folded sheet member 2 is not intended as a part thereof. It is prevented that the folded portion or the curled portion is led out from the twisted portion 40.
As a result, for example, when performing various processes such as a sealing process and a cutting process on the half-folded sheet member 2 on the downstream side of the twisted portion 40, the processing position may shift or the processing accuracy may decrease. Etc. are prevented. Further, even when various products are manufactured using the half-folded sheet member 2, it is possible to obtain effects such as a decrease in the frequency of occurrence of defective products.

  Next, a first embodiment of the method for manufacturing a folded sheet member of the present invention using the above-described manufacturing apparatus 10 will be described. The manufacturing method of this embodiment includes a half-folding step, a sandwiching step, and a twisting step.

  In the half-folding step, the strip-shaped sheet member 1 conveyed from the upstream side is folded in half along the longitudinal direction Y to form a half-folded sheet member 2. Specifically, after the sheet folding member 21 is brought into contact with the center portion 1c in the width direction of the sheet member 1 that is continuously conveyed from above, the folding guide 21 is formed, and then the sheet is formed at the side portion rising portion. Along the longitudinal direction Y of the sheet member 1, by raising the side regions 1s, 1s on both sides of the member 1 in the width direction X until they reach a state along the vertical direction Z, preferably a state parallel to the vertical direction Z. Fold in half. Thereby, the half-folded sheet member 2 is obtained. The contact portion of the half-fold guide 21 in the sheet member 1 is the lower end portion 2b of the half-fold sheet member 2 in the vertical direction Z. Preferably, in the half-folding step, the shape of the sheet member 1 when viewed in cross section along the width direction X is from a linear state that extends horizontally to a substantially V-shaped state, and then the sheet member 1 side. It changes into a form that extends in the vertical direction with the areas 1s and 1s contacting each other.

  In the half-folding step, it is preferable to adjust the contact degree between the half-fold guide 21 and the sheet member 1 to adjust the tension of the sheet member 1. By folding the sheet member 1 in two under such conditions, it is possible to prevent the sheet member 1 from bending and prevent unintended bending of the sheet member 1. As a result, a product with few defective products can be manufactured. A folding line (not shown) may be formed on the sheet member 1 along the longitudinal direction Y before performing the double folding process. The fold line may be a slit formed in the sheet member 1 intermittently. By forming the folding line on the sheet member 1 in advance, in the folding process, the sheet member 1 and the folding guide 21 are contacted so that the position of the folding line and the lower end portion 21b of the folding guide 21 coincide with each other. The sheet member 1 can be brought into contact with each other and the sheet member 1 can be accurately folded in two along the folding line.

  In the sandwiching step, the half-folded sheet member 2 obtained in the half-folding step is sandwiched. Specifically, the half-folded sheet member 2 formed by the half-fold process is introduced between the pair of nip rolls 31 and 31 and is nipped. Then, the bi-folded sheet member 2 is conveyed while the bi-folded sheet member 2 is pinched by the pair of nipping rolls 31, 31. At this time, since the half-folded sheet member 2 is sandwiched by the sandwiching portion 30, the half-folded sheet member 2 is twisted while maintaining the positions of the upper end portion 2a and the lower end portion 2b in the vertical direction Z of the half-folded sheet member 2. It can be transferred to the process.

  In the twisting process, the half-folded sheet member 2 is twisted around the axis with the direction along the transport direction Y as the axial direction. Specifically, the half-folded sheet member 2 that has passed through the sandwiching portion 30 is introduced between the pair of vertical guide rolls 41, 41, and the half-folded sheet member 2 is sandwiched between the pair of endless belts 43, 43. However, by being conveyed between the pair of horizontal guide rolls 42, 42, the bi-folded sheet member 2 is twisted by 90 degrees around the axis with the direction along the conveyance direction Y as the axial direction of the twist.

  Through the above steps, the half-folded sheet member 2 is conveyed to the downstream step. In the first embodiment of the manufacturing method of the present invention, a cutting step is performed in which the half-folded sheet member 2 after the twisting step is cut into a predetermined shape at the cutting portion.

  According to the first embodiment of the manufacturing method of the present invention, the half-folded sheet member 2 formed in the half-folding step is subjected to the twisting step while maintaining the positions of the upper end portion 2a and the lower end portion 2b in the vertical direction Z thereof. Can be introduced. Therefore, it is possible to prevent the half-folded sheet member 2 that has undergone the half-folding step and the twisting step from being bent or displaced in the vertical direction Z, and to be conveyed in the twisting step. The vertical position of the double-folded sheet member 2 when the double-folded sheet member 2 is changed, or the double-folded sheet member 2 is introduced into the twisting process with partial slack or curling in a part of the vertical direction. It can be effectively suppressed. As a result, the position of the double-folded sheet member 2 after the twisting process changes in the direction intersecting the vertical direction, preferably the position in the horizontal direction, and the double-folded sheet member 2 after the twisting process is not partially intended. It is also possible to prevent breakage and curling. As a result, for example, when performing various processes such as a sealing process and a cutting process on the half-folded sheet member 2 on the downstream side of the twisted portion 40, the processing position may shift or the processing accuracy may decrease. Etc. are also prevented. Further, even when various products are manufactured using the half-folded sheet member 2, it is possible to obtain effects such as a decrease in the frequency of occurrence of defective products.

  The sheet member 1 may be a sheet member made of one sheet material or may be a laminated sheet made of a plurality of sheet materials. Examples of the sheet material include a breathable sheet such as a non-woven fabric and a woven fabric, a non-breathable sheet such as a film and a laminate, a heating element sheet containing a heat generating composition, and the like, which are appropriately combined and used according to the design of the product. be able to. Each of these sheet materials may independently have stretchability or non-stretchability.

  Examples of the stretchable sheet material include nonwoven fabrics containing at least elastic fibers as constituent fibers. For example, air-through nonwoven fabrics, spunbonded nonwoven fabrics, meltblown nonwoven fabrics, and spunlace nonwoven fabrics can be used alone or in combination.

  The breathable sheet is preferably formed by including heat-fusible fibers. Examples of the heat-fusible fibers include polyolefin fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyester fibers, polyethylene-polypropylene composite fibers, polyethylene-polyester composite fibers, low-melting polyester-polyester composite fibers, and fiber surfaces are hydrophilic. Examples thereof include polyvinyl alcohol-polypropylene composite fibers, polyvinyl alcohol-polyester composite fibers, and the like. When the conjugate fiber is used, both the core-sheath type conjugate fiber and the side-by-side type conjugate fiber can be used. These heat-fusible fibers can be used alone or as a mixture of two or more kinds.

  The heat generating composition contained in the heat generating sheet preferably contains a magnetic material, a carbon component, water and the like. It is preferable to use a non-oxidizing metal as the magnetic material. As the particles of the oxidizable metal used as the magnetic material constituting the exothermic composition, a metal that generates heat of oxidation reaction is used, and for example, one kind selected from iron, aluminum, zinc, manganese, magnesium, and calcium, or Two or more kinds of powders and fibers can be mentioned. Among them, iron is preferable from the viewpoint of handleability, safety, manufacturing cost, storability and stability, and iron powder is particularly preferable. Examples of the iron powder include reduced iron powder and atomized iron powder. The particle size of the oxidizable metal particles may be, for example, about 0.1 to 300 μm. The carbon component constituting the exothermic composition has at least one of water retaining ability, oxygen supplying ability, and catalytic ability, and it is preferable to have all three functions. As the carbon component, for example, one kind or two or more kinds selected from activated carbon, acetylene black, and graphite can be used. Among these, activated carbon is preferably used from the viewpoint of easily adsorbing oxygen when wet and keeping the water content in the heating element constant. More preferably, one kind or two or more kinds of fine powdery substances or small granular substances selected from coconut shell charcoal, wood flour charcoal and peat charcoal are used. Among them, wood dust coal is preferable because it is easy to keep the water content of the heating element within a desired range.

  The manufacturing apparatus and the manufacturing method of the present invention include a sheet member including a stretchable sheet material and a sheet material formed of a constituent material having a relatively large mass such as a heating element sheet, and the mass distribution is biased to the central region in the width direction. It is particularly suitable for folding a folded sheet member in half and forming a folded sheet member. The half-folded sheet member containing such a sheet material is used for products such as a mask type heating element and an eye mask type heating element.

  A mask-type heating element, which is an example of a product using a laminated sheet made of a plurality of sheet materials, includes, for example, a breathable and stretchable surface sheet arranged on the skin-facing surface side of the wearer and a non-skin of the wearer. It has a breathable and stretchable back sheet arranged on the opposite surface side and a heating element sheet sandwiched between these sheets, and one surface of the top sheet is in contact with each other and the surface is It is folded in two so that it is on the inner surface side.

  The heating element sheet has a breathable sheet, a non-breathable sheet, and a heat generating composition between these sheets. The heating element sheet is arranged in each of a right-side area and a left-side area, which are symmetrically arranged with respect to a folding line having a slit, in the mask-type heating element folded in two. The position of the fold line in the mask-type heating element is arranged so as to substantially match the position of the wearer's nose and mouth when the mask-type heating element is worn, and the nose and mouth can be exposed from the slit portion. . The pair of heat generating sheets are arranged at positions symmetrical with respect to the folding line.

  In order to successfully manufacture a laminated sheet used for such a product, it is preferable that the conveyed laminated sheet is conveyed to a downstream process while being positioned at a desired position. However, when a sheet material having a large mass such as a heating element sheet is used, the mass distribution of the laminated sheet is biased due to the arrangement position of the sheet material and the like, and the bending due to gravity is caused in the conveying process of the laminated sheet. Or vertical misalignment may occur. In particular, the laminated sheet used for the mask-type heating element is produced in the manufacturing process of the laminated sheet, since the laminated sheet is symmetrically arranged in the widthwise central region of the stretchable sheet material to which the heating element sheet is conveyed. Has a biased mass distribution such that its central region in the width direction is heavy. That is, this laminated sheet has a higher basis weight in the central region in the width direction than in other regions.

  In this regard, the manufacturing apparatus 10 shown in FIG. 1 holds the conveyed laminated sheet between the time when the laminated sheet made of a plurality of sheet materials passes through the bi-folding section 20 and is introduced into the twisting section 40. Since it can be sandwiched by the part 30, the laminated sheet is prevented from being bent or displaced in the vertical direction Z, and the laminated sheet is conveyed to a downstream process in a state where the laminated sheet is located at a desired position. It becomes possible to do. In particular, when a laminated sheet having a biased mass distribution is folded in two and conveyed, a bending or vertical displacement due to gravity is apt to occur between the folding section 20 and the twisting section 40. Since the sandwiching portion 30 is provided between the portion 20 and the twisting portion 40, the laminated sheet is conveyed in a state in which the laminated sheet is located at a desired position while preventing the occurrence of bending and displacement. It becomes possible to do.

  As described above, according to the present invention, a sheet member made of one sheet material, a laminated sheet containing a stretchable sheet material, a laminated sheet containing a sheet material having a relatively large mass such as a heating element sheet, and Various laminated sheets such as a laminated sheet having an uneven mass distribution can be conveyed while maintaining the position at the time of conveyance. As a result, subsequent processes such as a sealing process and a cutting process are easily performed successfully, a product with few defective products can be manufactured, and product manufacturing efficiency can be improved.

  FIG. 2 shows a manufacturing apparatus 10B that is a second embodiment of the manufacturing apparatus of the present invention. Regarding the manufacturing apparatus 10B according to the second embodiment, the points different from the manufacturing apparatus 10 according to the first embodiment will be described. The points that are not particularly described are the same as those of the manufacturing apparatus 10 according to the first embodiment, and the description of the manufacturing apparatus 10 is applied as appropriate.

  In the second embodiment, as shown in FIG. 2, the strip-shaped sheet member 1 includes two sheet materials 3 and 4 and a heating element sheet 5 located between the two sheet materials 3 and 4. It is a laminated sheet 1 including. The heating element sheet 5 is a sheet-shaped member 5 containing a magnetic material, and has a larger basis weight than each of the two sheet materials 3 and 4. The sheet-shaped members 5 are arranged intermittently in the transport direction Y of the laminated sheet 1.

  The manufacturing apparatus 10B includes an upstream feed section 50, a downstream feed section 60, a sensor 70, and a bonding section forming section 80, in addition to the members included in the manufacturing apparatus 10 of the first embodiment. Further, in the manufacturing apparatus 10B, the configuration of the sandwiching section 30B is different from that of the sandwiching section 30 included in the manufacturing apparatus 10 of the first embodiment.

  As shown in FIG. 2, the upstream feed section 50 is arranged upstream of the half-folded section 20. The upstream feed unit 50 can adjust the tension of the laminated sheet 1. In the upstream feed section 50, a pair of feed rolls 51, 51 are arranged such that their axial directions coincide with the width direction X and face each other, and the laminated sheet 1 is supplied between the feed rolls 51, 51. It can be clamped.

  As shown in FIG. 2, the downstream feed section 60 is arranged downstream of the folded section 20. The downstream-side feed unit 60 includes a pair of pressing rolls 61, 61, and the rolls 61, 61 sandwich the two-fold laminated sheet 2 formed by folding the laminated sheet 1 in two, and perform two-fold lamination. The sheet 2 is conveyed to the downstream side. The pair of pressing rolls 61, 61 both have their axial directions extending vertically along the vertical direction Z, and the two-fold laminated sheet 2 is supplied and conveyed between the rolls 61, 61. Further, the pair of pressing rolls 61, 61 is configured to be able to apply tension to the laminated sheet 1 between the pressing rolls 61 and 61 and the upstream feed section 50. With such a configuration, the tension during conveyance of the laminated sheet 1 can be stabilized.

  The sensor 70 is arranged between the downstream feed part 60 and the sandwiching part 30B. The sensor 70 is capable of detecting the position in the vertical direction Z of the half-folded laminated sheet 2 formed by the half-folded portion 20. The sensor 70 may be one that issues a warning by, for example, light or sound when the position of the bi-fold laminated sheet 2 detected by the sensor 70 is different from the prescribed position, A signal may be transmitted to a calculation unit (not shown) or the like and a warning may be displayed on a display unit (not shown) such as a display. As the sensor 70, a transmissive photoelectric sensor, a reflective photoelectric sensor, a capacitive proximity sensor, or the like can be used. Among them, the reflective photoelectric sensor is used from the viewpoint of position detection accuracy and sensor installation space. Preference is given to using.

  The nipping portion 30B has a pair of upstream guide rolls 31B, downstream guide rolls 32B, and an endless belt 33B. The upstream guide roll 31B and the downstream guide roll 32 extend in the vertical direction Z. Specifically, the sandwiching unit 30B is in the form of a belt conveyor, and the endless belt 33B is provided on one of the pair of upstream guide rolls 31B and 31B and one of the pair of downstream guide rolls 32B and 32B. The endless belt 33B is bridged over the other of the pair of upstream guide rolls 31B, 31B and the other of the pair of downstream guide rolls 32B, 32B. The pair of endless belts 33B, 33B are arranged such that their respective surfaces facing each other abut on the side surfaces 2s, 2s of the half-folded laminated sheet 2. The sandwiching portion 30B sandwiches the folded double-layered sheet 2 conveyed by the pair of endless belts 33B and 33B.

  The sandwiching portion 30B has a magnetic region 34B that attracts the magnetic material of the heating element sheet 5. The magnetic region 34B means a region having magnetism. In the sandwiching portion 30B, the magnetic region 34B is arranged on the endless belt 33B. The magnetic region 34B may be arranged on the entire endless belt 33B or may be arranged on a part of the endless belt 33B. Since the sandwiching portion 30B has the magnetic region 34B, the sandwiching portion 30B sandwiches the double-folded laminated sheet 2 with the pair of endless belts 33B and 33B, and also double-folds the magnetic region 34B of the endless belt 33B. Since the sheet 2 can be sucked, it is possible to more stably sandwich the conveyed two-fold laminated sheet 2 in the sandwiching section 30B. From this point of view, the magnetic region 34B is preferably arranged at a position corresponding to the position of the heating element sheet 5 having the magnetic material in the two-fold laminated sheet 2 held by the holding portion 30B.

  Only one of the pair of endless belts 33B and 33B may have the magnetic region 34B, or both of them may have the magnetic region 34B. When both the pair of endless belts 33B and 33B have the magnetic regions 34B, the magnetic regions 34B may be arranged at the same position of the endless belt 33B or may be arranged at different positions.

  Further, the sandwiching portion 30B may have a magnetic member in addition to the upstream guide roll 31B, the downstream guide roll 32B, and the endless belt 33B. The magnetic region 34B may be formed. Examples of the member having magnetism include an alnico magnet, a ferrite magnet, a neodymium magnet, a sawtooth magnet, and the like. Among them, the neodymium magnet is preferably used from the viewpoint of high magnetic characteristics.

  The joint portion forming portion 80 is arranged on the downstream side of the twisted portion 40. The joining portion forming portion 80 is capable of forming a joining portion that maintains the folded state by fusing the folded double-layered sheet 2 at a portion near the lower end portion 2b. The joint portion forming portion 80 includes an anvil roll 82 and an energy applying portion 81 that is arranged to face the peripheral surface of the anvil roll 82. Examples of the energy applying unit 81 include an ultrasonic seal that applies an ultrasonic wave, a high frequency seal that applies a high frequency, and the like. In the manufacturing apparatus 10, an ultrasonic seal is used.

  Although the present invention has been described above based on its preferred embodiment, the present invention is not limited to the above-described embodiment. For example, in the first embodiment, the sandwiching unit 30 has the sandwiching roll 31, but instead of this, it may have a plate-shaped plate.

  Further, in the first embodiment, the twisting portion 40 is in the form of a belt conveyor, but the twisting portion may be in a form having a plurality of pairs of rolls. As an aspect having a plurality of pairs of rolls, for example, a pair of rolls is intermittently arranged from the upstream side to the downstream side in the transport direction Y, and the pair of rolls on the most upstream side is arranged in the direction along the vertical direction Z. It is arranged so as to extend, the pair of rolls on the most downstream side are arranged to extend in the direction along the width direction X, and the pair of rolls between the pair of rolls on the most upstream side and the roll on the most downstream side are A mode in which the vertical direction Z and the width direction X gradually fall from the upstream side to the downstream side in the transport direction Y can be mentioned.

Further, in the second embodiment, the sandwiching portion 30B has the magnetic region 34B, but instead of or in addition to this, the sandwiching portion may have a suction mechanism. As the sandwiching unit having the suction mechanism, for example, a sandwiching unit 30C having a vacuum conveyor 36C as shown in FIG. 3 can be used. In the sandwiching section 30C, in the sandwiching section 30B shown in the second embodiment, one of the pair of belt conveyors is a vacuum conveyor 36C. In the vacuum conveyor 36C, an endless breathable belt 33C is stretched over the upstream guide roll 31C and the downstream guide roll 32C. Further, the vacuum conveyor 36C includes a vacuum box 35C that sucks the folded double-layered sheet 2. The vacuum box 35C is arranged at a position facing the bi-fold laminated sheet 2 with the breathable belt 33C interposed therebetween. The vacuum box 35C vents the outside air from the side of the vacuum box 35C where the bi-fold laminated sheet 2 is arranged to the side where the bi-fold laminated sheet 2 is not arranged (direction of arrow R in FIG. 3 (b)). It is preferably capable of being sucked. The vacuum conveyor 36C sucks the half-folded laminated sheet 2 toward the breathable belt 33C by the suction of the vacuum box 35C via the breathable belt 33C. Since the sandwiching portion 30C has a suction mechanism, the sandwiching portion 30C sucks the double-folded laminated sheet 2 by the suction mechanism in addition to sandwiching the double-folded laminated sheet 2 by the endless belt 33B and the breathable belt 33C. Therefore, the two-fold laminated sheet 2 that is conveyed can be more stably sandwiched in the sandwiching section 30C.
Further, in the second embodiment, the magnetic region 34B is arranged on the endless belt 33B, but instead of or in addition to this, magnetic members or electromagnets are arranged on the sandwiching portions 30, 30B, 30C. By doing so, the magnetic region 34B may be formed in the sandwiching portions 30, 30B, 30C. For example, a magnetic member or the like may be arranged in the vacuum box 35C, or a magnetic member or the like may be arranged in place of the vacuum box 35C.

DESCRIPTION OF SYMBOLS 1 sheet member 1s side area of sheet member 2 double-folded sheet member 5 sheet-shaped member 10, 10B manufacturing device 20 double-folded portion 30, 30B, 30C sandwiching portion 34B magnetic region 40 twisting portion 70 sensor

Claims (7)

A fold-up portion that vertically raises the side regions on both sides in the width direction of the belt-shaped sheet member to be conveyed, folds the sheet member in half along the longitudinal direction, and forms a half-folded sheet member,
The bi-folded sheet member is provided with a twisting portion that twists about an axis while the feeding direction is an axial direction along the feeding direction.
An apparatus for manufacturing a half-folded sheet member, comprising a sandwiching portion that sandwiches the half-folded sheet member between the half-folded portion and the twisted portion.   The apparatus for manufacturing a half-folded sheet member according to claim 1, wherein the holding portion has a suction mechanism.   The sheet member is a laminated sheet that includes two sheet materials and a sheet-shaped member that is located between the two sheet materials and has a larger basis weight than each of the two sheet materials. 1. The apparatus for manufacturing a half-folded sheet member according to 1 or 2. The sheet member includes a magnetic material,
The said clamping part is a manufacturing apparatus of the half-folded sheet member of any one of Claims 1-3 which has the magnetic region which attracts | sucks the said magnetic material of the said sheet member.   The apparatus for manufacturing a half-folded sheet member according to any one of claims 1 to 4, further comprising: a sensor that detects a vertical position of the half-folded sheet member between the half-folded portion and the sandwiching portion. . A double-folding step in which side portions on both sides in the width direction of the belt-shaped sheet member to be conveyed are vertically raised and the sheet member is folded in two along the longitudinal direction to form a half-folded sheet member;
A twisting step of twisting the bi-folded sheet member around an axis with the direction along the carrying direction being an axial direction while being carried,
A method of manufacturing a half-folded sheet member, comprising a sandwiching step of sandwiching the half-folded sheet member between the half-folding step and the twisting step.   The method for manufacturing a folded sheet member according to claim 6, wherein the folded sheet member is conveyed while being sucked by a suction mechanism in the sandwiching step.