WO2016067461A1

WO2016067461A1 - Composite sheet manufacturing method and composite sheet manufacturing apparatus

Info

Publication number: WO2016067461A1
Application number: PCT/JP2014/079100
Authority: WO
Inventors: 聡光野
Original assignee: ユニ・チャーム株式会社
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-05-06
Also published as: JP5771766B1; CN107073830A; CN107073830B; JPWO2016067461A1

Abstract

The present invention is a method for manufacturing a composite sheet wherein a first sheet, both surfaces of which are flat, is bonded to a textured second sheet, the composite sheet manufacturing method being characterized: in comprising the pre-heating of the first sheet and the bonding of the pre-heated first sheet to the textured second sheet by heating and clamping using a pair of clamping members; and in the temperature of the first sheet at the position at which the first sheet begins to contact one of the pair of clamping members being higher than the temperature of the first sheet prior to pre-heating.

Description

Composite sheet manufacturing method and composite sheet manufacturing apparatus

The present invention relates to a composite sheet manufacturing method and a composite sheet manufacturing apparatus.

A composite in which an unevenly shaped second sheet (upper fiber sheet) is joined to a substantially flat first sheet (lower fiber sheet) as a surface sheet of absorbent articles such as sanitary napkins and disposable diapers. A sheet may be used (for example, refer to Patent Document 1). For example, the second sheet can be unevenly shaped by meshing the first roll and the second roll having an uneven outer peripheral surface. Then, the second sheet is superposed on the outer peripheral surface of the first roll while being formed in a concavo-convex shape, and the first sheet is overlaid on the second sheet positioned on the convex portion of the first roll. The composite sheet is manufactured by bonding the first sheet.

JP 2009-126107 A

In recent years, there is an increasing demand for higher speeds in the composite sheet production line. However, as the production line speeds up, there is a problem that the bonding time of the first sheet and the second sheet is shortened and the bonding strength is weakened.

The present invention has been made in view of the above problems, and an object thereof is to increase the bonding strength between the first sheet and the second sheet in the composite sheet.

A main invention for achieving the above object is a method for manufacturing a composite sheet in which a first sheet having flat surfaces and a second sheet formed with unevenness are joined, and the first sheet is preheated. And the first sheet preheated by the pair of clamping members and the second sheet formed with unevenness are joined by heating and clamping, and the pair of clamping pressures A temperature of the first sheet at a position where the first sheet starts to contact one of the clamping members is higher than a temperature of the first sheet before preheating. Production method.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, the bonding strength between the first sheet and the second sheet in the composite sheet can be increased.

1A is a side view of the composite sheet viewed from the width direction, FIG. 1B is a plan view of the composite sheet, FIG. 1C is a cross-sectional view of the composite sheet cut in a continuous direction and a thickness direction, and FIG. It is sectional drawing which cut | disconnected the composite sheet in the width direction and the thickness direction. It is explanatory drawing of the manufacturing apparatus of a composite sheet. It is explanatory drawing of a pair of embossing roller periphery. It is explanatory drawing of the manufacturing apparatus of the composite sheet in a modification. It is explanatory drawing of the manufacturing apparatus of the composite sheet in a modification.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
A method for producing a composite sheet in which a first sheet having flat surfaces and a second sheet formed with irregularities are joined, wherein the first sheet is preheated and a pair of pressing members are used for preheating. Joining the first sheet that has been formed and the second sheet that has been unevenly shaped by heating and pinching, and one of the pair of pinching members has the pinching member The composite sheet manufacturing method is characterized in that a temperature of the first sheet at a position where the first sheet starts to contact is higher than a temperature of the first sheet before preheating.
According to such a method for manufacturing a composite sheet, the temperature of the first sheet increases when the first sheet and the second sheet are joined, and the constituent material of the first sheet that contributes to joining by softening can be increased. The bonding strength between the first sheet and the second sheet can be increased.

This is a method for manufacturing a composite sheet, wherein the first sheet is preheated from the side of the first sheet on which the second sheet is joined.
According to such a method for manufacturing a composite sheet, the temperature on the joining surface side of the first sheet is further increased, and the constituent material on the joining surface side of the first sheet is softened and contributes to joining. The bonding strength of the two sheets can be further increased.

A method for manufacturing such a composite sheet, which is a roller that conveys the first sheet while being in contact with the first sheet, and finally comes into contact before the first sheet contacts the one pressing member. A roller is a roller which preheats the said 1st sheet | seat, It is a manufacturing method of the composite sheet | seat characterized by the above-mentioned.
According to such a method for manufacturing a composite sheet, the temperature decrease of the preheated first sheet can be suppressed, and the bonding strength between the first sheet and the second sheet can be efficiently increased.

In this method of manufacturing a composite sheet, the supply speed at which the first sheet is supplied between the pair of pressing members is higher than the supply speed at which the second sheet is supplied between the pair of pressing members. This is a method for producing a composite sheet characterized by being fast.
According to such a method for manufacturing a composite sheet, the first sheet that is softened by preheating and easily contributes to bonding is supplied between the pair of pressing members per unit time compared to the second sheet. Therefore, the bonding strength between the first sheet and the second sheet can be further increased.

In this method of manufacturing a composite sheet, the outer peripheral surface of the other pinching member of the pair of pinching members forms an uneven shape, and before joining the first sheet and the second sheet, The second sheet is heated and pinched by the other pressing member and another pressing member, and the first sheet and the second sheet are formed after the second sheet is formed. In the composite sheet manufacturing method, the second holding member sucks the second sheet and adsorbs the second sheet to the outer peripheral surface until the second sheet is joined.
According to such a method for manufacturing a composite sheet, the first sheet and the second sheet can be joined while maintaining the concave-convex shape of the second sheet, and the temperature tends to decrease due to the suction of the other pressing member. Since the first sheet, not the sheet, is preheated, the bonding strength between the first sheet and the second sheet can be increased efficiently.

In this method of manufacturing a composite sheet, the second sheet is preheated before the second sheet is conveyed between the other pressing member and the other pressing member, and the other pressing force is The composite sheet manufacturing method is characterized in that the temperature of the second sheet at a position where the second sheet starts to contact the member is higher than the temperature of the second sheet before preheating.
According to such a composite sheet manufacturing method, when the first sheet and the second sheet are joined, not only the first sheet but also the temperature of the second sheet is increased, so that the joining strength between the first sheet and the second sheet is increased. Increased further.

In this method of manufacturing a composite sheet, the second sheet is sucked in a recess in the outer peripheral surface of the other pressing member.
According to such a method for manufacturing a composite sheet, the portion of the second sheet supported by the convex portion of the outer peripheral surface of the other pinching member, that is, the portion of the second sheet joined to the first sheet. Since the temperature drop can be suppressed, the bonding strength between the first sheet and the second sheet can be efficiently increased.

Also, a composite sheet manufacturing apparatus in which a first sheet having flat surfaces and a second sheet formed with irregularities are joined, a preheating mechanism for preheating the first sheet, and a pair of clamping members And a joining mechanism that joins the preheated first sheet and the unevenly shaped second sheet by heating and sandwiching, and sandwiches one of the pair of sandwiching members. The composite sheet manufacturing apparatus is characterized in that the temperature of the first sheet at a position where the first sheet starts to contact the pressure member is higher than the temperature of the first sheet before preheating.
According to such a composite sheet manufacturing apparatus, the temperature of the first sheet is increased at the time of joining the first sheet and the second sheet, and the constituent material of the first sheet that contributes to the joining by softening can be increased. The bonding strength between the first sheet and the second sheet can be increased.

=== Composite sheet ===
1A is a side view of the composite sheet 1 viewed from the width direction, FIG. 1B is a plan view of the composite sheet 1, and FIG. 1C is a cross-sectional view of the composite sheet 1 cut in a continuous direction and a thickness direction. FIG. 1D is a cross-sectional view of the composite sheet 1 cut in the width direction and the thickness direction. In the following description, three directions orthogonal to each other in the composite sheet 1 are referred to as “continuous direction”, “width direction”, and “thickness direction” in which the composite sheet 1 continues.

As shown in FIG. 1C and FIG. 1D, the composite sheet 1 has a two-layer structure in which a second sheet 3 that is unevenly shaped is bonded to one surface in the thickness direction of the first sheet 2 that is flat on both sides. It is a sheet. In detail, the convex part 4 and the recessed part 5 are formed in the surface of the thickness direction one side of the 2nd sheet 3, and the 1st sheet 2 and the 2nd sheet 3 are partially in the recessed part 5 of the 2nd sheet | seat 3. Are joined (heat-sealed). Moreover, the convex part 4 of the 2nd sheet | seat 3 is a quadrangular frustum shape, The inside of the convex part 4 becomes the cavity 4a, and the cavity 4a is exposed in the surface of the thickness direction other side of the 2nd sheet | seat 3. is doing.

Further, as shown in FIG. 1B, the convex portions 4 (white coating portions) and the concave portions 5 (cross hatched portions) are alternately arranged along the continuous direction, and are also arranged alternately along the width direction. That is, the concave portion 5 is surrounded by the convex portion 4 in both the continuous direction and the width direction. In FIG. 1B, since the length of the concave portion 5 in the continuous direction is shorter than the length of the convex portion 4 in the continuous direction, a part of the convex portions 4 adjacent in the width direction are joined. In addition, the shape and arrangement | positioning of the convex part 4 and the recessed part 5 are not restricted to what is shown in FIG. For example, each planar shape of the convex portion 4 and the concave portion 5 may be a circle, a square, a rhombus, or the like, and the convex portions 4 may be discretely arranged in a curved shape. Further, the convex portions 4 may be partially joined together, or the convex portions 4 may be completely surrounded by the concave portions 5. Moreover, you may provide the recessed part 5 from which depth differs, in other words, you may provide the convex part 4 from which height differs. Moreover, as the 1st sheet | seat 2 and the 2nd sheet | seat 3 which comprise the composite sheet 1, the nonwoven fabric containing a thermoplastic resin fiber, a plastic film, etc. are mentioned.

Suppose that such a composite sheet 1 is used as a surface sheet of an absorbent article such as a sanitary napkin, a disposable diaper, or a pet sheet used for animal excretion. In this case, since the contact area between the user and the surface sheet (composite sheet 1) can be reduced, the touch can be softened or the air permeability can be increased. In particular, as shown in FIG. 1B, by enclosing the concave portion 5 with the convex portion 4, high-viscosity excrement (menstrual blood or loose stool) that is difficult to permeate into the sheet can be taken into the concave portion 5, and the spread of excrement can be suppressed. . However, the composite sheet 1 is not limited to being used as the top sheet, and the composite sheet 1 may be used as, for example, a second sheet between the top sheet and the absorber. Moreover, you may use the composite sheet 1 for a mask, a cleaning sheet, etc., for example.

=== Production Method of Composite Sheet ===
FIG. 2 is an explanatory diagram of the manufacturing apparatus 10 for the composite sheet 1. FIG. 3 is an explanatory view around the pair of embossing rollers 19. In the present embodiment, a case where the continuous sheet 1 of the composite sheet 1 is manufactured from the continuous sheet of the first sheet 2 and the continuous sheet of the second sheet 3 is taken as an example, but not limited thereto, the first sheet 2, The second sheet 3 and the composite sheet 1 may be sheets cut to a predetermined length.

The composite sheet manufacturing apparatus 10 includes a plurality of guide rollers 11a to 11e that define a conveyance path of the first sheet 2 and the second sheet 3, and a first roll R1 around which the first sheet 2 is wound. 2, a first feed roller 12 that feeds the second sheet 3 from a second roll R <b> 2 around which the second sheet 3 is wound, a first tension measurement roller 14, and a second tension measurement roller. 15, a pair of first speed adjustment rollers 16, a pair of second speed adjustment rollers 17, a pair of preheating rollers 18 (preheating mechanism), a pair of embossing rollers 19, and a joining roller 20.

The first tension measuring roller 14 winds the first sheet 2 between the

guide rollers

11a and 11b, and measures the tension of the first sheet 2 between the

guide rollers

11a and 11b by the force received from the first sheet 2. Similarly, the second tension measuring roller 15 measures the tension of the second sheet 3 between the

guide rollers

11c and 11d.

The pair of first speed adjustment rollers 16 (16a, 16b) are driven and rotated around a rotation axis along the width direction of the first sheet 2, and the first sheet 2 is held in the thickness direction while the first sheet 2 is sandwiched in the thickness direction. These are a pair of rollers (nip rollers) that are sent to the downstream side in the transport direction at a speed of V1 (m / min). Both

rollers

16a and 16b may be drive rollers, or one may be a drive roller and the other may be a driven roller. An example of the unit is “m / min”, but is not limited thereto. Similarly, the pair of second speed adjusting rollers 17 (17a, 17b) is driven and rotated around the rotation axis along the width direction of the second sheet 3, and the second sheet 3 is sandwiched in the thickness direction while the second sheet 3 is sandwiched in the thickness direction. 3 is a pair of rollers that feeds 3 out to the downstream side in the transport direction at a predetermined speed.

The pair of preheating rollers 18 (18a, 18b) rotate around a rotation axis along the width direction of the first sheet 2 and preheat (heat) the first sheet 2 before joining the second sheet 3. It is. Each preheating

roller

18a, 18b has a heater 181 inside, and its outer peripheral surface is heated. Therefore, the first sheet 2 is preheated by being conveyed while being wound around the outer peripheral surfaces of the preheating

rollers

18a and 18b. The number of preheating rollers is not limited to two.

The pair of embossing rollers 19 (19a, 19b) includes a first embossing roller 19a and a second embossing roller 19b that are driven and rotated around a rotation axis along the width direction of the first sheet 2 and the second sheet 3. Convex portions 191 and concave portions 192 are formed on the outer peripheral surfaces of the first and

second embossing rollers

19a and 19b in accordance with the concave-convex shape formed on the second sheet 3, and the convex portions of the first embossing roller 19a are formed. The part 191 and the concave part 192 and the convex part 191 and the concave part 192 of the second embossing roller 19b are in mesh with each other. Moreover, as shown in FIG. 3, the heater 193 is provided in each inside of the 1st,

2nd embossing roller

19a, 19b, and each outer peripheral surface is heated.

Further, a suction box 194 is provided inside the first embossing roller 19a, and a suction hole 195 that communicates with the suction box 194 and opens into the recess 192 on the outer peripheral surface of the first embossing roller 19a is provided. ing. Further, it is assumed that the position of the suction box 194 shown in FIG. 3 is fixed with respect to the rotating first embossing roller 19a. Therefore, as shown in FIG. 3, in the present embodiment, the second sheet 3 is from the time when the second sheet 3 starts to join the first embossing roller 19 a until the first sheet 2 and the second sheet 3 are joined. 3 adsorbs to the outer peripheral surface (especially recessed part 192) of the 1st embossing roller 19a. In FIG. 3, only the communication hole 195 facing the suction box 194 is shown for the sake of simplicity.

The joining roller 20 is a roller that is driven and rotated about a rotation axis along the width direction of the first sheet 2 and the second sheet 3, and is positioned at a position downstream of the engagement direction of the pair of embossing rollers 19 in the transport direction. It is provided facing the embossing roller 19a. Moreover, as shown in FIG. 3, the heater 201 is provided in the inside of the joining roller 20, and the outer peripheral surface is heated.

In addition, the temperature of each outer peripheral surface of the pair of preheating rollers 18, the pair of embossing rollers 19, and the joining roller 20 is set to a temperature lower than the melting point of the constituent materials of the first sheet 2 and the second sheet 3. Further, it is only necessary that at least one of the first and

second embossing rollers

19a and 19b is heated, and it is only necessary that at least one of the first embossing roller 19a and the joining roller 20 is heated.

In the composite sheet manufacturing apparatus 10, first, the first sheet 2 is fed out from the first roll R 1 by the first feeding roller 12, and the first sheet 2 includes the guide roller 11 a, the first tension measuring roller 14, and the guide. It is conveyed while being wound around the roller 11b in order. At this time, the control unit (not shown) of the composite sheet 1 manufacturing apparatus 10 starts from the first tension measuring roller 14 so that the first sheet 2 is conveyed to the pair of first speed adjusting rollers 16 with a predetermined tension. Based on the acquired tension of the first sheet 2, the feeding amount of the first sheet 2 from the first feeding roller 12 is controlled. In the present embodiment, the tension of the first sheet 2 conveyed to the pair of first speed adjustment rollers 16 is set as low as possible, specifically, the first sheet 2 is conveyed without being loosened. The tension per unit width (50 mm) is set within a range of 1 to 3N, but is not limited thereto.

The first sheet 2 adjusted to a predetermined tension is sent to the pair of preheating rollers 18 at the first speed V1 (m / min) by the pair of first speed adjusting rollers 16. For this purpose, the control unit controls the peripheral speed Va (m / min) of the pair of first speed adjusting rollers 16 (usually, the sheet conveyance speed V1 and the roller peripheral speed Va are approximately equal to each other). Controlled).

Thereafter, after the first sheet 2 is wound around the outer peripheral surface of the preheating roller 18a and the surface 2b opposite to the bonding surface 2a with the second sheet 3 is preheated and conveyed, the opposite bonding surface 2a is It is wound around the outer peripheral surface of the preheating roller 18b, preheated and conveyed. The pair of preheating rollers 18 may be a driving roller or a driven roller. However, even after the pair of preheating rollers 18 passes, the conveying speed of the first sheet 2 becomes the first speed V1. To. Thus, the first sheet 2 is adjusted to a predetermined tension, the conveyance speed is adjusted to the first speed V1, and is supplied between the first embossing roller 19a and the joining roller 20 in a preheated state.

On the other hand, the second sheet 3 is fed from the second roll R2 by the second feeding roller 13, and conveyed while being wound around the guide roller 11c, the second tension measuring roller 15, and the guide roller 11d in this order. At this time, similarly to the first sheet 2, the second sheet 3 is also conveyed to the pair of second speed adjustment rollers 17 with a predetermined tension (in this embodiment, the same tension as the first sheet 2). It is controlled. Thereafter, the second sheet 3 is stretched by the pair of second speed adjusting rollers 17 at a predetermined speed (for example, when the second sheet 3 is stretched and torn at the time of uneven forming by engagement of the pair of embossing rollers 19). At a lower speed). Thus, the second sheet 3 is supplied between the pair of embossing rollers 19 in a state adjusted to a predetermined tension and a predetermined conveyance speed.

As described above, since the outer peripheral surfaces of the pair of embossing rollers 19 are heated, the second sheet 3 that has passed between the pair of embossing rollers 19 is softened, and the meshing shape of the pair of embossing rollers 19 is increased. That is, it is shaped into an uneven shape. The second sheet 3 subjected to the uneven shape is adsorbed along the uneven shape of the outer peripheral surface of the first embossing roller 19a by the suction box 194 and the suction hole 195, and between the first embossing roller 19a and the joining roller 20. To be transported.

Further, the outer peripheral surface of the joining roller 20 is heated, and the first sheet 2 is preheated. Therefore, the first sheet 2 and the second sheet 3 are overlapped between the first embossing roller 19a and the bonding roller 20 and bonded (heat fusion) by being pinched in a softened state by heating. . Specifically, the portion of the second sheet 3 supported by the convex portion 191 of the first embossing roller 19a, that is, the portion of the second sheet 3 that becomes the concave portion 5 of the composite sheet 1, and the first sheet 2 are the first. The convex portion 191 of the embossing roller 19a and the outer peripheral surface of the joining roller 20 are sandwiched and joined. In this way, the composite sheet 1 is manufactured.

In the present embodiment, the pair of embossing rollers 19 (tips of the convex portions 191) conveys the second sheet 3 at the second speed V2 (m / min), and the first embossing rollers 19a (tips of the convex portions 191). ) And the joining roller 20 feed a second speed (m / min) at which the composite sheet 1 is fed, and a first speed V1 (m / min) at which the first sheet 2 is supplied between the first embossing roller 19a and the joining roller 20 ) (V1> V2). Therefore, the control unit is configured such that the peripheral speed Vb (m / min) of the pair of embossing rollers 19 (tips of the convex portions 191) and the peripheral speed Vb (m / min) of the joining roller 20 are a pair of first speeds. Control is performed so as to be slower than the peripheral speed Va (m / min) of the adjustment roller 16 (Va> Vb).

As described above, in the method for manufacturing the composite sheet 1 of the present embodiment, the first embossing roller 19 a and the joining roller 20 (the pair of sandwiching rollers 20) are preheated after the first sheet 2 having both flat surfaces is preheated by the pair of preheating rollers 18. The preheated first sheet 2 and the unevenly shaped second sheet 3 are joined by heating and clamping pressure by a pressure member and a joining mechanism. Furthermore, the temperature T1 ° C. of the first sheet 2 at the position where the first sheet 2 starts to contact the joining roller 20 (one clamping member) (p1 in FIG. 3) is the first sheet 2 before preheating, that is, It is assumed that the first sheet 2 and the second sheet 3 are joined in a state higher than the temperature T2 ° C. of the first sheet 2 at the position upstream of the preheating roller 18 in the conveying direction (p2 in FIG. 3). That is, the arrangement, temperature, and the like of the pair of preheating rollers 18 so that the first sheet 2 and the second sheet 3 are joined while the heat of the first sheet 2 preheated by the pair of preheating rollers 18 is maintained. Has been adjusted.

Therefore, in this embodiment, the 1st sheet 2 and the 2nd sheet | seat 3 can be joined in the state where the temperature of the 1st sheet | seat 2 is high compared with the case where the 1st sheet | seat 2 is not preheated, for example. Therefore, since the amount of the constituent material of the first sheet 2 softened (melted) in the first sheet 2 at the time of joining, that is, the amount of the constituent material contributing to joining can be increased, the first sheet 2 and the second sheet 3 are increased. The joint strength can be increased. Therefore, even when the joining time of the 1st sheet 2 and the 2nd sheet 3 becomes short by speeding up the manufacturing line of the composite sheet 1, the 1st sheet 2 and the 2nd sheet 3 can be joined reliably. In other words, even when the production line of the composite sheet 1 is speeded up, the temperature of the outer peripheral surface of the first embossing roller 19a and the joining roller 20 is set to be equal to or higher than the melting point temperature of the first sheet 2 and the second sheet 3, for example. Since it is not necessary to raise the temperature excessively, it is possible to prevent the first sheet 2 and the second sheet 3 from being broken at the time of joining.

Also, the first sheet 2 having flat surfaces as compared with the second sheet 3 formed with unevenness is less likely to cause width fluctuation due to tension applied during conveyance even if the first sheet 2 is softened by preheating. Therefore, the width fluctuation of the composite sheet 1 can be suppressed by preheating the first sheet 2 instead of the second sheet 3 as in the present embodiment. Moreover, when the 2nd sheet | seat 3 is heated too much by preheating, there exists a possibility that the convex part 4 may become hard too much. Therefore, like the present embodiment, by preheating the first sheet 2 instead of the second sheet 3, it is possible to suppress the touch and cushioning properties of the composite sheet 1 from being reduced due to the curing of the convex portions 4.

Moreover, in this embodiment, before joining the 1st sheet | seat 2 and the 2nd sheet | seat 3, the 1st embossing roller 19a (other pinching member) and the 2nd embossing roller 19b (separate another outer peripheral surface comprise uneven | corrugated shape) The second sheet 3 is unevenly shaped by heating and pressing with a pressing member. Then, as shown in FIG. 3, the first embossing roller 19 a sucks the second sheet 3 after the second sheet 3 is unevenly shaped until the first sheet 2 and the second sheet 3 are joined. Then, the second sheet 3 is adsorbed on the outer peripheral surface. That is, the 1st sheet 2 and the 2nd sheet 3 are joined in the state where the concavo-convex shape of the 2nd sheet 3 was held with the peripheral surface which is the concavo-convex shape of the 1st embossing roller 19a. Therefore, even if the pinching force by the 1st embossing roller 19a and the joining roller 20 is raised, the joining strength of the 1st sheet 2 and the 2nd sheet 3 can be raised, without crushing the uneven | corrugated shape of the 2nd sheet 3. FIG.

On the other hand, when the second sheet 3 is sucked and adsorbed to the outer peripheral surface of the first embossing roller 19a, the temperature of the second sheet 3 is likely to be lower than that of the first sheet 2. Moreover, since the outer peripheral surface of the 1st embossing roller 19a is uneven | corrugated shape and it is easy to disturb external air, it can be said that the temperature of the 2nd sheet | seat 3 is easy to fall compared with the 1st sheet | seat 2. However, in this embodiment, since the first sheet 2 is preheated instead of the second sheet 3 whose temperature is likely to decrease before joining, the joining strength between the first sheet 2 and the second sheet 3 can be efficiently increased.

Furthermore, in this embodiment, the suction hole 195 is provided in the recessed part 192 in the outer peripheral surface of the first embossing roller 19a, and the second sheet 3 is sucked in the recessed part 192. Therefore, compared with the site | part of the 2nd sheet | seat 3 hold | maintained at the recessed part 192 of the 1st embossing roller 19a (site | part corresponded to the convex part 4 of the composite sheet 1), it hold | maintains at the convex part 191 of the 1st embossing roller 19a. The temperature of the portion of the second sheet 3 (the portion corresponding to the concave portion 5 of the composite sheet 1) is less likely to decrease. That is, since the temperature drop of the part joined to the 1st sheet 2 among the 2nd sheets 3 can be controlled, the joining strength of the 1st sheet 1 and the 2nd sheet 3 can be raised efficiently.

In the present embodiment, as shown in FIG. 3, the second sheet 3 starts from the position where the second sheet 3 starts to join the first embossing roller 19 a, not after the uneven shaping of the second sheet 3. The recess 192 sucks the second sheet 3. Therefore, before the second sheet 3 is unevenly shaped by the engagement of the pair of embossing rollers 19, a part of the second sheet 3 is drawn into the concave portion 192 of the first embossing roller 19a. The shape can be surely made.

Further, in the present embodiment, the first sheet 2 is preheated from the joining surface 2a side that joins the second sheet 3 out of both surfaces of the first sheet 2 by the preheating roller 18b. Therefore, for example, compared with the case of preheating the first sheet 2 only from the surface 2b side opposite to the bonding surface 2a of the first sheet 2, the constituent material on the bonding surface 2a side of the first sheet 2, that is, More constituent materials that contribute to bonding can be softened. Therefore, the bonding strength between the first sheet 2 and the second sheet 3 can be further increased.

In addition, if the first sheet 2 comes into contact with a roller whose outer peripheral surface is not heated before the contact with the joining roller 20 after passing the preheating roller 18b, the temperature of the preheated first sheet 2 is lowered. Resulting in. On the other hand, in this embodiment, it is a roller which conveys the 1st sheet 2 in contact with the 1st sheet 2, Comprising: Before the 1st sheet 2 contacts the joining roller 20 (one pinching member), it is. The roller that comes into contact lastly is a preheating roller 18 b that preheats the first sheet 2. Therefore, the temperature drop of the preheated 1st sheet | seat 2 can be suppressed, and the joining strength of the 1st sheet | seat 2 and the 2nd sheet | seat 3 can be raised efficiently.

In particular, in this embodiment, the preheating roller 18b that comes into contact lastly before the first sheet 2 contacts the joining roller 20 preheats the first sheet 2 from the joining surface 2a side. Therefore, at the time of joining the first sheet 2 and the second sheet 3, the temperature on the joining surface 2a side of the first sheet 2 can be made higher, and the constituent materials of the first sheet 2 that contribute to joining can be softened more. Therefore, the bonding strength between the first sheet 2 and the second sheet 3 can be further increased.

However, the present invention is not limited to the above embodiment, and for example, the first sheet 2 may be preheated only from the surface 2b side opposite to the bonding surface 2a of the first sheet 2, or between the preheating roller 18b and the bonding roller 20. An unheated roller may be provided, or the preheating roller that comes into contact last before the first sheet 2 contacts the bonding roller 20 preheats the surface 2b opposite to the bonding surface 2a of the first sheet 2. May be. In addition, the first sheet 2 is not limited to preheating with a roller. For example, the first sheet 2 has a thickness of the first sheet 2 and hot air is passed along the surface of the first sheet 2. The first sheet 2 may be preheated by spraying hot air on 2.

In the present embodiment, the first sheet 2 has a supply speed (first speed V1) supplied between the first embossing roller 19a and the joining roller 20, and the second sheet 3 has a convex portion of the first embossing roller 19a. The supply speed (second speed V2) supplied between the first embossing roller 19a and the joining roller 20 is increased by 191. Therefore, the length of the sheet supplied per unit time between the first embossing roller 19a and the joining roller 20 is the length of the preheated first sheet 2 of the second sheet 3 that is not preheated. It is longer than the length (the length in a state where irregularities are formed). That is, the first sheet 2 and the second sheet can be supplied more between the first embossing roller 19a and the joining roller 20 because the first sheet 2 is softened by preheating and easily contributes to joining as compared with the second sheet 3. 3 is further enhanced.

In particular, in the present embodiment, the tensions of the first sheet 2 and the second sheet 3 are made uniform before adjusting the conveying speeds of the first sheet 2 and the second sheet 3, and the first sheet 2 is Since the concave and convex shapes are not formed as in the case of the two sheets 3 (because they are not folded), the first sheet 2 is more inferior to the second sheet 3 in the joint portion between the first sheet 2 and the second sheet 3. The amount (weight per unit area) of the constituent material can be increased. That is, since the amount of the constituent material of the first sheet 2 that easily contributes to the bonding can be increased, the bonding strength between the first sheet 2 and the second sheet 3 can be further increased.

Moreover, in this embodiment, each circumferential speed Vb of the 1st embossing roller 19a and the joining roller 20 is more compared with the circumferential speed Va of a pair of 1st speed adjustment roller 16 which adjusts the conveyance speed of the 1st sheet | seat 2. slow. That is, compared to the first speed V1 of the first sheet 2 supplied between the first embossing roller 19a and the joining roller 20, the first embossing roller 19a and the joining roller 20 cause the composite sheet 1 (first sheet 2) to move. The second speed V2 sent out downstream in the transport direction is slower. Therefore, it is possible to prevent the preheated and softened first sheet 2 from being pulled strongly for conveyance, and the width variation of the first sheet 2 can be suppressed. Note that the first sheet 2 is joined to the second sheet 3 in a state where the tension is lower than that of the second sheet 3 by the amount supplied, but the periphery of the first joining roller 19a and the joining roller 20 Thus, the speed difference between the first speed V1 and the second speed V2 may be set so that the first sheet 2 does not accumulate.

=== Modification ===
FIG.4 and FIG.5 is explanatory drawing of the manufacturing apparatus 10 'of the composite sheet 1 in a modification. In the said embodiment (FIG. 2), although the 1st sheet | seat 2 is not wound around the joining roller 20, it is not restricted to this. For example, as in the modification of FIG. 4, the first sheet 2 is wound around the joining roller 20 so that the winding angle θ of the first sheet 2 with respect to the joining roller 20 is greater than 0 °. May be supplied between the first embossing roller 19 a and the joining roller 20. By doing so, when the outer peripheral surface of the joining roller 20 is heated, the preheated first sheet 2 is further heated and joined to the second sheet 3. The bonding strength of the second sheet 3 can be further increased. In other words, since the first sheet 2 can be preheated also by the outer peripheral surface of the joining roller 20, for example, the temperature of the outer peripheral surface of the pair of preheating rollers 18 can be lowered, and the joining strength between the first sheet 2 and the second sheet 3 can be increased. Increased efficiently.

Moreover, in the said embodiment, although the 2nd sheet | seat 3 is not preheated, it is not restricted to this, For example, like a modification of FIG. 5, between a pair of 2nd speed adjustment rollers 17 and a pair of embossing rollers 19 Further, a pair of preheating rollers 21 (21a, 21b) whose outer peripheral surfaces are heated by the heater 211 may be provided. And before conveying the 2nd sheet 3 between a pair of embossing rollers 19, the 2nd sheet 3 is preheated and the 2nd sheet | seat 3 in the position p3 which the 2nd sheet 3 begins to contact with the 1st embossing roller 19a. The temperature T3 ° C. may be higher than the temperature T4 ° C. of the second sheet 3 before preheating, that is, the second sheet 3 at the position p4 upstream of the pair of preheating rollers 21 in the conveying direction. By doing so, the temperature of not only the first sheet 2 but also the second sheet 3 is increased at the time of joining, and the amount of the constituent material of the second sheet 3 that softens in the second sheet 3, that is, the structure that contributes to joining. Since the amount of the material can be increased, the bonding strength between the first sheet 2 and the second sheet 3 can be further increased. Moreover, since the temperature of the 2nd sheet 3 can be raised also at the time of uneven | corrugated shaping | molding of the 2nd sheet | seat 3, an uneven | corrugated shape can be made reliably and an uneven | corrugated shape can be made clear.

In the above embodiment (FIG. 2), the outer peripheral surface of the second embossing roller 19b has an uneven shape, but the present invention is not limited to this and may be flat. In this case, only the surface on one side of the second sheet 3 has an uneven shape, and the other surface is a flat sheet. Moreover, in the said embodiment, although the joining of the 1st sheet 2 and the 2nd sheet 3 and the uneven | corrugated shaping of the 2nd sheet 3 are also performed on the outer peripheral surface of the 1st embossing roller 19a, not only this but the 1st You may perform uneven | corrugated shaping of the 2 sheet | seat 3 with another roller.

As described above, the above embodiment is for facilitating understanding of the present invention, and is not intended to limit the present invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Composite sheet, 1st sheet, 3rd 2nd sheet, 4 convex part, 4a cavity, 5 concave part, 10 composite sheet manufacturing apparatus, 11a-11e guide roller, 12 1st feeding roller, 13 2nd feeding roller, 14 First tension measuring roller, 15 Second tension measuring roller, 16 pair of first speed adjusting rollers, 17 pair of second speed adjusting rollers, 18 pair of preheating rollers (preheating roller, preheating mechanism), 181 heater, 19 pairs Embossing roller, 19a First embossing roller (a pair of clamping members, the other clamping member, joining mechanism), 19b Second embossing roller (another clamping member), 191 convex part, 192 concave part, 193 heater, 194 Suction box, 195 suction holes, 20 joining rollers (a pair of clamping members, one The press member, the bonding mechanism), 21 a pair of preheating rollers, 211 a heater

Claims

A method for producing a composite sheet, in which a first sheet with flat surfaces and a second sheet formed with irregularities are joined,
Preheating the first sheet;
Joining the preheated first sheet and the irregularly shaped second sheet by heating and pressing with a pair of pressing members;
Have
The temperature of the first sheet at a position where the first sheet starts to contact one of the pair of pressing members is higher than the temperature of the first sheet before preheating;
A method for producing a composite sheet characterized by the above.
It is a manufacturing method of the composite sheet according to claim 1,
Preheating the first sheet from the side joining the second sheet of both surfaces of the first sheet;
A method for producing a composite sheet characterized by
A method for producing the composite sheet according to claim 1 or 2,
A roller that conveys the first sheet while in contact with the first sheet, and the roller that comes into contact last before the first sheet contacts the one pressing member preheats the first sheet. Being a roller,
A method for producing a composite sheet characterized by the above.
A method for producing a composite sheet according to any one of claims 1 to 3,
The supply speed at which the first sheet is supplied between the pair of pressing members is faster than the supply speed at which the second sheet is supplied between the pair of pressing members;
A method for producing a composite sheet characterized by the above.
A method for producing a composite sheet according to any one of claims 1 to 4,
The outer peripheral surface of the other pinching member of the pair of pinching members has an uneven shape,
Before joining the first sheet and the second sheet, the second sheet is heated and sandwiched by the other pressing member and another pressing member to form irregularities by heating and pressing.
The second pressing member sucks the second sheet between the second sheet and the second sheet until the first sheet and the second sheet are joined. Adsorbing the sheet,
A method for producing a composite sheet characterized by
A method for producing a composite sheet according to claim 5,
Before conveying the second sheet between the other clamping member and the other clamping member, preheating the second sheet,
The temperature of the second sheet at a position where the second sheet begins to contact the other pinching member is higher than the temperature of the second sheet before preheating;
A method for producing a composite sheet characterized by the above.
A method for producing a composite sheet according to claim 5 or 6,
The second sheet is sucked in the recess in the outer peripheral surface of the other clamping member;
A method for producing a composite sheet characterized by the above.
The first sheet having both flat surfaces and the second sheet formed with irregularities are bonded composite sheet manufacturing apparatuses,
A preheating mechanism for preheating the first sheet;
A joining mechanism that joins the first sheet preheated by the pair of sandwiching members and the second sheet shaped to be uneven by heating and sandwiching;
Have
The temperature of the first sheet at a position where the first sheet starts to contact one of the pair of pressing members is higher than the temperature of the first sheet before preheating;
An apparatus for producing a composite sheet characterized by the above.