WO2024034461A1

WO2024034461A1 - Web joining device and web joining method

Info

Publication number: WO2024034461A1
Application number: PCT/JP2023/028090
Authority: WO
Inventors: 正人廣安
Original assignee: 株式会社瑞光
Priority date: 2022-08-08
Filing date: 2023-08-01
Publication date: 2024-02-15

Abstract

Provided are a web joining device and a web joining method that enable web joining to be performed in a short period of time, and save labor for the work of an operator. A web joining device (100) is provided with a first support part (10), a second support part (20), a first joining member (30), and a second joining member (40). The first support part supports a first roll (R1) on which a first web (W1) is wound. The second support part supports a second roll (R2) on which a second web (W2) is wound. The second joining member, together with the first joining member, sandwiches the first web fed out from the first roll and the second web fed out from the second roll in an overlapped state. The first joining member and the second joining member weld the sandwiched first web and second web together.

Description

Web splicing device and web splicing method

The present invention relates to a web splicing device and a web splicing method.

Web supply devices are known that supply webs to various manufacturing devices (for example, manufacturing devices for disposable diapers, disposable pants, sanitary products, masks, etc.). The web supply device conveys the web unwound from the web roll, and supplies the web to the manufacturing device.

In such a web feeding device, since the web is continuously fed, when the web of the original roll used runs out (when the original roll is used), the web of a new original roll for replacement is supplied. is attached to the web of the used raw roll.

Conventionally, such web splicing has been carried out by cutting the vicinity of the rear end of the web of a used raw roll with a knife, as disclosed in, for example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2004-76221). This is done using a method in which the end of the web that has been removed is joined to the tip of the web of a new roll using a tape.

Japanese Patent Application Publication No. 2004-76221

However, joining webs with such tape may not be easy depending on the thickness and properties of the web, and it may take a long time to join the tape, or it may be necessary for workers to join the webs manually. There is a risk of

An object of the present invention is to provide a web splicing device and a web splicing method that can perform web splicing in a short time and save labor for the operator.

The web splicing device according to the present invention includes a first support part, a second support part, a first joining member, and a second joining member. The first support part supports the first roll around which the first web is wound. The second support part supports the second roll around which the second web is wound. The second joining member sandwiches the superimposed first web fed out from the first roll and the second web fed out from the second roll, between the first bonding member and the first web fed out from the second roll. The first joining member and the second joining member weld the first web and the second web sandwiched therebetween.

A web splicing method according to the present invention is a web splicing method that splices a first web unwound from a first roll supported by a first support part and a second web unwound from a second roll supported by a second support part. It is. The web joining method includes a step of sandwiching a first web and a second web between a first joining member and a second joining member. Further, the web joining method includes a step of welding the first web and the second web sandwiched between the first joining member and the second joining member by the first joining member and the second joining member.

In the web splicing device and web splicing method according to the present invention, since web splicing is performed without using tape, it is possible to perform web splicing in a short time, and it is possible to save the labor of the operator.

FIG. 1 is a schematic configuration diagram showing the overall configuration of a web splicing device. FIG. 3 is a schematic diagram of the first joining member viewed from the sealing surface side. FIG. 3 is a schematic cross-sectional view of the first joining member taken along arrow III-III in FIG. 2; FIG. 6 is a drawing depicting a state of a welding process of a first web and a second web by a first joining member and a second joining member according to an example. FIG. 6 is a drawing depicting a state of a welding process between a first web and a second web by a first joining member and a second joining member according to another example. 2 is a control block diagram of the web splicing device of FIG. 1. FIG. 12 is a flowchart of a web splicing operation when preheating the web before welding in Modification D.

Hereinafter, a web splicing device and a web splicing method according to an embodiment of the present invention will be described with reference to the drawings.

(1) Overall Overview The overall overview of the web splicing device 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 6. FIG. 1 is a schematic configuration diagram showing the overall configuration of a web splicing apparatus 100. FIG. 6 is a control block diagram of the web splicing device 100.

The web splicing device 100 is a web W feeding device that feeds out a web W from a roll R around which the web W is wound, and a web W of a used roll R and a web W of a replacement (new) roll R. It is a device that connects The web W supply device supplies the web W to, for example, but not limited to, manufacturing devices for disposable diapers, disposable pants, sanitary products, masks, and the like. The web W is a thermoplastic sheet. For example, the web W is a sheet of thermoplastic nonwoven fabric.

Note that, hereinafter, for convenience of explanation, the used roll R will be referred to as the first roll R1, and the new roll R for replacement will be referred to as the second roll R2. Further, the web W on the first roll R1 is called a first web W1, and the web W on the second roll R2 is called a second web W2.

As shown in FIGS. 1 and 6, the web splicing device 100 mainly includes

support parts

10 and 20, a splicing mechanism 50, and a controller 80.

The

support parts

10 and 20 are mechanisms that support the roll R. The supports 10 and 20 also function as part of a web W supply device.

The joining mechanism 50 is a mechanism that welds the first web W1 and the second web W2. In the present embodiment, the joining mechanism 50 also functions as a mechanism for cutting the first web W1 by melting on the side closer to the first roll R1 than the welded part of the first web W1 to the second web W2.

The controller 80 controls the operations of various components of the web splicing device 100. Note that the controller 80 may be a control device dedicated to the web splicing device 100, or the controller of the web W supply device may also function as the controller of the web splicing device 100.

(2) Details (2-1) Support section The

support sections

10 and 20 support the roll R around which the web W is wound. The supports 10 and 20 also function as part of a web W supply device.

The support part 10 has a support shaft 12 that supports the roll R. Further, the support section 10 includes a drive section 14 that rotationally drives the support shaft 12 and rotates the roll R supported by the support shaft 12. The drive unit 14 is, for example, a motor. The drive unit 14 rotates the support shaft 12 in the direction of the arrow D1 (see FIG. 1) during normal operation (when feeding the web W of the roll R to the manufacturing device). The drive unit 14, which functions as a web W supply device, cooperates with a web conveyance mechanism (not shown) of the web W supply device to direct the web W, which is unwound from the roll R supported by the support shaft 12, onto a predetermined conveyance path. It is transported along the line to various manufacturing equipment.

The support part 20 has a support shaft 22 that supports the roll R. Further, the support section 20 includes a drive section 24 that rotationally drives the support shaft 22 and rotates the roll R supported by the support shaft 22. The drive unit 24 is, for example, a motor. The drive unit 24 rotates the support shaft 22 in the direction of the arrow D1 (see FIG. 1) during normal operation (when feeding the web W of the roll R to the manufacturing device). The drive unit 24, which functions as a web W feeding device, cooperates with a web conveying mechanism (not shown) of the web W feeding device to move the web W, which is unwound from the roll R supported by the support shaft 22, onto a predetermined conveying path. It is transported along the line to various manufacturing equipment.

In addition, below, for convenience of explanation, the support part 10 may be called the first support part 10, and the support part 20 may be called the second support part 20. In this embodiment, the first support part 10 supports the first roll R1, which is a used roll R, and the second support part 20 supports a new second roll R2 for replacement. , the web splicing apparatus 100 of this embodiment will be explained.

Note that the support section 10 can also function as a second support section in the claims when supporting a new roll R, and the support section 20 can also function as the second support section in the claims when supporting a used roll R. It can also function as the first support in the range.

(2-2) Joining mechanism The joining mechanism 50 welds the first web W1 and the second web W2. Further, in this embodiment, the joining mechanism 50 also cuts the first web W1 by fusing.

The joining mechanism 50 mainly includes a first joining member 30, a second joining member 40, a joining member driving section 44, an SSR (solid state relay) 36, and a temperature sensor 60. In the example of FIG. 1, the first joining member 30 is provided on the left side (on the side directly facing the first web W1), and the second joining member 40 is provided on the right side (on the side directly facing the second web W2). , this arrangement may be reversed.

The first joining member 30 and the second joining member 40 are arranged adjacent to each other as shown in FIG. The first joining member 30 and the second joining member 40 sandwich the first web W1 and the second web W2 in an overlapping state between the first joining member 30 and the second joining member 40. The first web W1 and the second web W2 are welded. More specifically, the first joining member 30 and the second joining member 40 connect the first web W1 and the second web W2, which are being pulled toward the supply destination (manufacturing apparatus) of the web W, to the first joint member 30 and the second joining member 40. It is sandwiched between the joining member 30 and the second joining member 40, and the sandwiched first web W1 and second web W2 are welded together. Further, the first joining member 30 and the second joining member 40 melt-cut the first web W1 on the side closer to the first roll R1 than the welded part of the first web W1 to the second web W2.

The joining member driving unit 44 moves the first joining member 30 so that the first joining member 30 and the second joining member 40 approach each other, and so that the first joining member 30 and the second joining member 40 are separated from each other. and the second joining member 40 are moved relatively.

The SSR 36 is used to supply power to the heating wire 32 of the first joining member 30, which will be described later.

The temperature sensor 60 is a sensor that measures the temperature of the heating wire 32.

Various configurations of the joining mechanism 50 will be described below.

(a) First joining member The first joining member 30 will be explained with reference to FIGS. 2 and 3. FIG. 2 is a schematic diagram of the first joining member 30 viewed from the sealing surface 30a side. The sealing surface 30a is a surface facing the second joining member 40 arranged adjacently. FIG. 3 is a schematic cross-sectional view of the first joining member 30 taken along arrow III-III in FIG. The sealing surface 30a of the first joining member 30 is overlapped with the sealing surface 40a of the second joining member 40 (the surface facing the sealing surface 30a of the first joining member 30 arranged adjacently). The first web W1 and the second web W2 are sandwiched, and the sandwiched first web W1 and second web W2 are welded.

The first joining member 30 is a rod-shaped member whose longitudinal direction extends in a direction perpendicular to the conveyance direction A (see FIGS. 1 and 2) in which the web W is conveyed by the web W supply device. The length of the first bonding member 30 in the longitudinal direction is longer than the width of the web W (the length of the web W in the direction perpendicular to the transport direction A). Although the shape is not limited, the first joining member 30 is a quadrangular prism-shaped member whose longitudinal direction extends in a direction perpendicular to the conveying direction A.

The first joining member 30 includes a base material 31 and a heating wire 32, which is an example of a heating element, and is provided on the sealing surface 30a side of the first joining member 30 with respect to the base material 31. The heating wire 32 extends in a direction perpendicular to the conveying direction A. The heating wire 32 is, for example, a nichrome wire. The heating wire 32 is attached to the base material 31 while being sandwiched between the glass tapes 34. The base material 31 supports a heating wire 32 that is attached to the base material 31 while being sandwiched between glass tapes 34 . The outer surface of the glass tape 34 that covers the heating wire 32 from the outside (the side opposite to the base material 31) functions as the sealing surface 30a of the first joining member 30. A temperature sensor 60 is arranged between the glass tape 34 and the base material 31, which are located closer to the base material 31 than the heating wire 32. The temperature sensor 60 is preferably arranged at the center of the heating wire 32 in the direction orthogonal to the conveyance direction A, as shown in FIG.

When welding the first web W1 and the second web W2 by the first joining member 30 and the second joining member 40, or when cutting the first web W1, the heating wire 32 of the first joining member 30 is powered. The joining mechanism 50 uses heat generated by the heating wire 32 to raise the temperature of the first web W1 and the second web W2 to a temperature higher than the melting point, welds the first web W1 and the second web W2, and further welds the first web W1 and the second web W2. 1. Cutting the web W1 by melting.

(b) Second joining member The second joining member 40 will be explained with reference to FIG. 4. FIG. 4 is a drawing depicting the state of the welding process of the first web W1 and the second web W2 by the first joining member 30 and the second joining member 40 according to an example. Note that, in FIG. 4, the drawing of the glass tape 34 of the first joining member 30 is omitted to avoid complicating the drawing. Moreover, although the heating wire 32 has a circular cross section in FIG. 4, the cross-sectional shape of the heating wire 32 is not limited to the shape drawn, and any shape may be selected.

The second joining member 40 has a shape corresponding to the first joining member 30. The second joining member 40 is a rod-shaped member whose longitudinal direction extends in a direction perpendicular to the conveyance direction A in which the web W is conveyed by the web W supply device. The length of the second bonding member 40 in the longitudinal direction is longer than the width of the web W (the length of the web W in the direction perpendicular to the transport direction A). Although the shape is not limited, the second joining member 40 is a quadrangular prism-shaped member that extends longitudinally in a direction perpendicular to the transport direction A of the web W.

The second joining member 40 includes a base material 41 and an elastic member 42. The surface of the base material 41 that faces the sealing surface 30a of the first joining member 30 functions as the sealing surface 40a of the second joining member 40. The sealing surface 40a is an example of the first surface in the claims. The elastic member 42 is provided on the sealing surface 40a. The elastic member 42 is made of, for example, heat-resistant fluororubber, although the material is not limited thereto. For example, the elastic member 42 is arranged to cover the entire sealing surface 40a.

However, the present invention is not limited thereto, and the elastic member 42 may be disposed only on a part of the sealing surface 40a, for example, on the downstream side of the heating wire 32 in the transport direction A of the web W, as shown in FIG. It's okay. Also in this case, it is preferable that the elastic member 42 is provided over the entire sealing surface 40a in the direction perpendicular to the conveying direction A of the web W (the longitudinal direction of the second joining member 40).

The effect of providing the elastic member 42 will be explained.

Suppose that the first web W1 and the second web W2, which are overlapped without the elastic member 42, are connected to the rigid sealing surface 30a of the first joining member 30 and the rigid sealing surface 40a of the second joining member 40. Suppose you are caught between. In this case, the first web W1 and the second web W2 in an overlapping state contact the heating wire 32 of the first joining member 30 in a state close to point contact. Therefore, sufficient bonding strength between the first web W1 and the second web W2 may not be ensured.

On the other hand, by providing the elastic member 42 in the second joining member 40, the first web W1 and the second web W2 in the overlapped state are also deformed due to the deformation of the elastic member 42, and the first web W1 in the overlapped state The contact area between W1 and the second web W2 and the heating wire 32 can be increased. As a result, the first web W1 and the second web W2 are likely to be firmly joined.

Furthermore, by providing the elastic member 42, the following effects can also be obtained.

As described above, the first joining member 30 and the second joining member 40 connect the first web W1 and the second web W1 which are being pulled (tensioned) toward the supply destination (manufacturing device) of the web W. The web W2 is sandwiched between the first joining member 30 and the second joining member 40, and the sandwiched first web W1 and second web W2 are welded. At this time, the tension acting on the first web W1 is not always constant. For example, if the tension is large, the webs W1, W2 may separate from the heating element before the welded webs W1, W2 cool and harden, and the desired welding may not be performed.

On the other hand, by providing the elastic member 42 on the sealing surface 40a of the second joining member 40, the movement of the webs W1 and W2 during welding can be suppressed from both the first joining member 30 side and the second joining member 40 side. It can be regulated from The thickness of the elastic member 42 (the thickness in the direction in which the first bonding member 30 and the second bonding member 40 are lined up) is the thickness of the heating wire 32 (the thickness in the direction in which the first bonding member 30 and the second bonding member 40 are lined up). It is preferable that the thickness be approximately the same as the thickness in the direction shown in FIG.

(c) Jointing member driving unit The joining member driving unit 44 drives the sealing surface of the first joining member 30 so that the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 approach each other. The first joining member 30 and the second joining member 40 are moved relatively so that the sealing surface 40a of the second joining member 30a and the second joining member 40 are separated from each other. The joining member driving unit 44 is, for example, a motor or an air cylinder that moves the second joining member 40.

For example, the joining member driving section 44 moves the second joining member 40. Alternatively, the joining member driving section 44 may move the first joining member 30. Furthermore, the joining member driving section 44 may move both the first joining member 30 and the second joining member 40 so that they approach each other or move away from each other.

(d) SSR
An SSR (solid state relay) 36 is used to control power supply to the heating wire 32. A DC power supply 90 is connected to the SSR 36, and a DC current is supplied to the heating wire 32.

Note that current may be supplied to the heating wire 32 from an AC power source. However, by supplying current from a DC power source to the heating wire 32, the following effects can be obtained.

For example, when using an AC power source, depending on the source of the power (for example, in countries or regions where the voltage of the power source is unstable), the power supplied to the heating wire 32 may not always be the same. be. On the other hand, if a DC power source is used, the voltage is stable, so the amount of heat generated by the heating wire 32 can be easily controlled to be constant. Furthermore, when using a DC power source, the device tends to be more compact than when using an AC power source. Furthermore, when performing PWM control using a combination of a DC power supply and the SSR 36, fine power adjustment is possible.

(e) Temperature Sensor The temperature sensor 60 measures the temperature of the heating wire 32. Although the type of sensor is not limited, the temperature sensor 60 is a sheet-shaped thermocouple.

A controller 80, which will be described later, controls the heat generation of the heating wire 32 based on the temperature measurement result by the temperature sensor 60 so that the temperature of the heating wire 32 reaches the target temperature. Specifically, the controller 80, which will be described later, controls the SSR 36 and controls the heat generation of the heating wire 32 so that the temperature of the heating wire 32 reaches the target temperature based on the temperature measurement result by the temperature sensor 60.

(2-3) Controller The controller 80 includes a CPU (not shown), memories such as ROM and RAM, input/output devices, and various electrical and electronic components. The controller 80 may be one device or may be configured by a plurality of devices.

As shown in FIG. 6, the controller 80 is electrically connected to the drive section 14, the drive section 24, the joining member drive section 44, the SSR 36, and the remaining amount sensor 120.

Here, the remaining amount sensor 120 is a sensor that detects the remaining amount of the film (first roll R1 or second roll R2) in use. For example, the remaining amount sensor 120 is a sensor that detects when the diameter of the film being used has become less than or equal to a predetermined value. The remaining amount sensor 120 is, for example, a photoelectric sensor. However, the type of remaining amount sensor 120 is not limited to a photoelectric sensor, and may be a displacement sensor, a length measurement sensor, or the like, for example.

The controller 80 controls the operations of the drive section 14, the drive section 24, the joining member drive section 44, and the SSR 36 by the CPU executing a program stored in the memory.

Furthermore, the controller 80 is electrically connected to the temperature sensor 60, as shown in FIG. The controller 80 controls the operation of the SSR 36 based on the temperature measured by the temperature sensor 60.

(2-3-1) Operation of web splicing device Control of the operation of the web splicing device 100 by the controller 80 will be explained.

As a premise of the description, it is assumed that the web W supply device is in operation, the drive unit 14 of the first support unit 10 rotates the support shaft 12 in the direction D1, and the web conveyance mechanism (not shown) is in operation. . As a result, it is assumed that the first web W1 unwound from the first roll R1 supported by the first support section 10 is being conveyed in the conveyance direction A toward the manufacturing apparatus to which the web W is to be supplied. Furthermore, as a premise of the explanation, the tip of the second web W2 of the second roll R2 supported by the second support section 20 (the tip of the second web W2 pulled out from the second roll R2) is the first tip of the second web W2 of the first roll R1. It is pulled out from the second roll R2 and set at a predetermined position in the joining mechanism 50 of the web splicing device 100 so that the first web W1 can be spliced when the web W1 runs out (when the amount is below a predetermined amount). It is assumed that For example, when the first joining member 30 and the second joining member 40 approach each other, the leading end of the second web W2 of the second roll R2 meets the sealing surface 30a of the first joining member 30. It is set in such a position that it is sandwiched between the sealing surface 40a of the two joining members 40. Further, as a premise of the description, it is assumed that the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 are separated from each other.

On this premise, the web W supply device stops operation when the remaining amount sensor 120 detects that the remaining amount of the web W1 on the first roll R1 has become less than a predetermined amount. As a result, the web transport mechanism (not shown) is stopped. Further, the drive section 14 of the first support section 10 of the web splicing device 100 also stops operating. Note that even if the operation of the web W supply device is stopped, tension is still acting on the first web W1 in the transport direction A.

(a) Clamping process/welding process In this state, the controller 80 controls the SSR 36 to increase the temperature of the heating wire 32. Note that the controller 80 controls the operation of the SSR 36 based on the measurement result of the temperature of the heating wire 32 by the temperature sensor 60 so that the temperature of the heating wire 32 reaches the target temperature.

Then, the controller 80 controls the operation of the joining member drive unit 44 to bring the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 closer to each other, so that the first The first web W1 of roll R1 and the second web W2 of second roll R2 are welded.

(b) Fusing process Further, the controller 80 controls the drive section 14 of the first support section 10 in a state where the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 are close to each other. Then, by rotating the support shaft 12 in the direction RD1 (see FIG. 1) opposite to that during normal operation, the first web W1 is wound onto the first roll R1. In other words, the controller 80 controls the drive part 14 of the first support part 10 in a state where the seal surface 30a of the first joint member 30 and the seal surface 40a of the second joint member 40 are close to each other, and controls the drive part 14 of the first support part 10 to 12 in the direction RD1 opposite to that during normal operation, the first web W1 is pulled toward the first roll R1. As a result, the part of the first web W1 that was heated between the first joining member 30 and the second joining member 40, which is closer to the first roll R1 than the welded part with the second web W2, is heated between the first joining member 30 and the second joining member 40. and tension.

Thereafter, the controller 80 controls the operation of the joining member drive section 44 to separate the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 from each other. Note that, before separating the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 from each other, the controller 80 blows the first web W1 and the first web W1 from the air blowing device 110 (see FIG. 6). It is preferable to rapidly cool the welded portion by blowing air onto the welded portion with the two webs W2. The air blowing device 110 is, for example, a device that is provided near the joining mechanism 50 and blows compressed air toward the welding location between the first web W1 and the second web W2. Note that by cooling the welded area, the first web W1 and the second web W2 are firmly joined at the welded area, and the sealing surface 30a of the first joining member 30 and the second joining member 40 are sealed. When the first web W1 and the second web W2 are released from being sandwiched between the surfaces 40a, the problem of the first web W1 and the second web W2 coming uncoupled is suppressed.

Thereafter, when the web W feeding device starts transporting the web W (second web W) in the transport direction A by a web transport mechanism (not shown), the controller 80 operates the drive unit 24 of the second support unit 20. Then, the support shaft 22 is rotated in the direction D2 (see FIG. 1).

Note that the above operation of the web splicing device 100 is only an example, and can be changed as appropriate.

For example, in the above description, the controller 80 causes the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 to approach each other after increasing the temperature of the heating wire 32. However, this order is only an example. For example, the controller 80 controls the operation of the joining member driving section 44 and causes the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 to approach each other, thereby sealing the first joining member 30. After sandwiching the first web W1 and the second web W2 between the surface 30a and the sealing surface 40a of the second joining member 40, controlling the SSR 36 to raise the temperature of the heating wire 32 to the target temperature, The first web W1 and the second web W2 may be welded together.

For example, in the above description, the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 are close to each other (in a state in which the first web W1 and the second web W2 are sandwiched). ), by rotating the support shaft 12 in the direction RD1 opposite to that during normal operation, the part of the first web W1 closer to the first roll R1 than the welded part with the second web W2 is fused. ing. Instead, for example, the controller 80 controls the operation of the joining member driving section 44 to separate the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 from each other. Before the heated portion of the first web W1 is cooled, the support shaft 12 is rotated in the direction RD1 opposite to that during normal operation, and the first roll is heated from the welded portion of the first web W1 with the second web W2. The first web W1 may be fused on the side closer to R1. Alternatively, the controller 80 may, for example, control the operation of the bonding member drive section 44 to separate the sealing surface 30a of the first bonding member 30 and the sealing surface 40a of the second bonding member 40 from each other, and then the first web W1 Before the heated portion of the web W is cooled, the web W feeding device starts transporting the first support portion 10 at a stage when a web transport mechanism (not shown) starts transporting the web W (second web W2) in the transport direction A. By operating the drive unit 14 to rotate the support shaft 12 in the direction RD1 or keeping the support shaft 12 stopped, the first roll R1 is moved from the welded part of the first web W1 to the second web W2. The first web W1 may be cut by fusing on the side closer to.

(3) Features (3-1)
The web splicing device 100 of this embodiment includes a first support section 10, a second support section 20, a first joining member 30, and a second joining member 40. The first support section 10 supports the first roll R1 around which the first web W1 is wound. The second support section 20 supports the second roll R2 around which the second web W2 is wound. The second joining member 40 sandwiches, between the first joining member 30, the first web W1, which is unrolled from the first roll R1, and the second web W2, which is unrolled from the second roll R2, which are in an overlapping state. . The first joining member 30 and the second joining member 40 weld the first web W1 and the second web W2 sandwiched therebetween.

Since the web splicing device 100 of the present embodiment performs web splicing without using tape, it is possible to perform web splicing in a short time, and it is also possible to save the labor of the operator.

(3-2)
In the web splicing device 100 of the present embodiment, the first joining member 30 and the second joining member 40 are connected to the second web W2 of the first web W1 when welding the first web W1 and the second web W2. The first web W1 is cut by melting on the side closer to the first roll R1 than the welded part with the first roll R1.

In this web splicing device 100, web splicing and web fusing are performed using the same configuration (first splicing member 30 and second splicing member 40). Enlargement of the splicing device 100 can be suppressed.

(3-3)
In the web splicing device 100 of this embodiment, the first support section 10 includes a drive section 14 that rotates the first roll R1. When fusing the first web W1, the drive unit 14 stops driving the first roll R1 or rotates the first roll R1 in a direction RD1 to wind up the first web W1.

In this web splicing device 100, a tension force directed toward the first roll R1 is applied to a portion of the first web W1 upstream from the joining point with the second web W2, so that the first web W1 can be melted and cut smoothly. can be achieved.

(3-4)
In the web splicing device 100 of this embodiment, the first joining member 30 has a heating wire 32 as an example of a heating element.

In this web splicing device 100, the first web W1 and the second web W2 can be welded by the heat of the heating wire 32 provided on the first joining member 30.

(3-5)
In the web splicing device 100 of this embodiment, the second joining member 40 has a sealing surface 40a as an example of a first surface facing the first joining member 30. An elastic member 42 is provided on the sealing surface 40a of the second joining member 40.

In this web splicing device 100, the contact area between the web W and the heating wire 32 can be increased, and the first web W1 and the second web W2 can be firmly joined.

(3-6)
The web splicing apparatus 100 of this embodiment includes a temperature sensor 60 that measures the temperature of the heating wire 32 and a controller 80 that controls heat generation of the heating wire 32. The controller 80 controls the heat generation of the heating wire 32 based on the measurement result of the temperature sensor 60.

In this web joining device 100, the heat generation of the heating wire 32 is controlled based on the temperature of the heating wire 32, so the first web W1 and the second web W2 can be joined at an appropriate welding temperature.

(3-7)
In the web splicing apparatus 100 of this embodiment, the heating element is an electric heating wire 32, and a current is supplied from a DC power source 90.

When an AC power source supplies power to the heating wire 32, the power supplied to the heating wire 32 may become unstable in areas where the voltage of the power supply source is unstable. On the other hand, since the web splicing device 100 uses a DC power source, the voltage is stable and the amount of heat generated by the heating wire 32 is easily controlled to a predetermined amount at all times. Furthermore, when using a DC power source, the web splicing device 100 tends to be more compact than when using an AC power source.

(3-8)
In the web splicing method of the present embodiment, the first web W1 is unwound from the first roll R1 supported by the first support section 10, and the second web W2 is unwound from the second roll R2 supported by the second support section 20. This is a web joining method. The web joining method includes a step of sandwiching the first web W1 and the second web W2 between the first joining member 30 and the second joining member 40. In addition, the web joining method includes welding the first web W1 and the second web W2 sandwiched between the first joining member 30 and the second joining member 40 by the first joining member 30 and the second joining member 40. It includes a process of

In this web splicing method, web splicing is performed without using tape, so web splicing can be performed in a short time, and the labor of the worker can be saved.

(3-9)
In the web joining method of this embodiment, when welding the first web W1 and the second web W2 by the first joining member 30 and the second joining member 40, the first web W1 and the second web W2 are welded together. A step of fusing the first web W1 on the side closer to the first roll R1 than the welding location is provided.

In this web splicing method, web splicing and web fusing are performed using the same configuration (first splicing member 30 and second splicing member 40). Enlargement of the device 100 can be suppressed.

(4) Modifications Modifications of the above embodiment are shown below. Note that some configurations of each modification may be combined with the above embodiment. In addition, the configurations of a plurality of modified examples may be combined with the above embodiment if they do not contradict each other.

(4-1) Modification A
In the embodiment described above, the first web W1 and the second web W2 are welded together by the heat of the heating wire 32 provided on the first joining member 30. However, the present invention is not limited to this, and the first web W1 and the second web W2 may be welded together without using the heating wire 32.

For example, the web splicing device 100 may ultrasonically weld the first web W1 and the second web W2. In this case, for example, the first joining member 30 is a horn that vibrates ultrasonically, and the second joining member 40 is an anvil. Even in this case, it is possible to weld the first web W1 and the second web W2 and to cut the first web W1 by using the first joining member 30 and the second joining member 40. can. Note that when the web splicing device 100 is configured in this manner, the web splicing device 100 does not need to have the heating wire 32, the temperature sensor 60, or the elastic member 42.

(4-2) Modification B
In the embodiment described above, the first joining member 30 and the second joining member 40 weld the first web W1 and the second web W2 and cut the first web W1, but the web joining device 100 performs such a process. Not limited to configuration. For example, the web splicing device 100 may include a cutting mechanism for cutting the first web W1, in addition to the first joining member 30 and the second joining member 40. The cutting mechanism may cut the first web W1 using a cutting blade instead of fusing.

(4-3) Modification C
In the embodiment described above, the controller 80 controls the supply of electric power to the heating wire 32 based on the temperature of the heating wire 32 measured by the temperature sensor 60.

However, the temperature sensor 60 may be omitted, and for example, the controller 80 may supply power to the heating wire 32 for a predetermined period of time. However, in order to accurately control the temperature of the heating wire 32, the controller 80 preferably controls the supply of power to the heating wire 32 based on the temperature of the heating wire 32 measured by the temperature sensor 60.

(4-4) Modification D
The web splicing device and web splicing method of the present disclosure may preheat the welded portion of the first web W1 and the second web W2 before welding the first web W1 and the second web W2. . Note that preheating here means heating at least one of the first web W1 and the second web W2 in a temperature range in which the first web W1 and the second web W2 do not melt (the first web W1 and the second web W2 are heated before welding). This means heating (warming) the first web W1 and the second web W2 (at a temperature that does not exceed the melting point of the web W2).

By performing such preheating, when the first web W1 and the second web W2 are welded, the welded part of the first web W1 and the second web W2 is easily heated to a uniform and appropriate temperature. The welding location between the first web W1 and the second web W2 is likely to be uniformly and firmly welded, and the reliability of web joining becomes high.

The web splicing device 100 according to modification D preheats the first web W1 and the second web W2 at a temperature lower than the melting points of the first web W1 and the second web W2 before welding the first web W1 and the second web W2. It has a preheating mechanism that preheats the welding location between W1 and the second web W2.

Note that the preheating mechanism may be used separately from the joining mechanism 50. For example, the preheating mechanism may be an infrared heater or the like used separately from the bonding mechanism 50.

Further, the preheating mechanism may be a heater separate from the heating wire 32 (heating element used for welding) provided on the first joining member 30 of the joining mechanism 50.

However, from the viewpoint of reducing the number of parts, it is preferable that the heating wire 32 (heating element used for welding) of the first joining member 30 of the joining mechanism 50 functions as a preheating mechanism.

A web in which the heating wire 32 of the first joining member 30 of the joining mechanism 50 is used as a preheating mechanism to preheat the first web W1 and the second web W2 before welding the first web W1 and the second web W2. An example of the operation of the splicing device 100 will be described with reference to the flowchart of FIG. 7. Note that there are many parts that overlap with those described in the above embodiments, so in order to simplify the explanation, the explanation of the redundant parts may be omitted unless particularly necessary.

Also in this modification D, similarly to the above embodiment, the first roll R1 set on the first support part 10 is a used roll (the first web W1 is almost used up), and the second support part The explanation will be given by taking as an example a case where the second roll R2 set at No. 20 is a replacement roll. As a premise of the explanation, the tip of the second web W2 of the second roll R2 is attached to the second roll so that it can come into contact with the first web W1 when the first web W1 runs out (when the amount becomes less than a predetermined amount). It is assumed that it has been pulled out from R2 and set at a predetermined position of the joining mechanism 50 of the web splicing device 100 (at the position described in the above embodiment). Further, as a premise of the explanation, while the first web W1 is being supplied to the manufacturing apparatus to which the web W is supplied, the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 are , are assumed to be separated from each other.

On this premise, when the controller 80 detects that the remaining amount of the first web W1 on the first roll R1 has become less than a predetermined amount based on the detection result of the remaining amount sensor 120, the controller 80 detects that the first web W1 is being transported while the first web W1 is being conveyed. Then, the temperature of the heating wire 32 is increased by controlling the SSR 36 (without stopping the conveyance of the first web W1). For example, when the controller 80 determines that the diameter of the first roll R1 (original roll diameter) has become equal to or less than the first diameter based on the detection result of the remaining amount sensor 120, the controller 80 controls the SSR 36 to adjust the temperature of the heating wire 32. and raise it (step S1).

Note that the trigger for starting the temperature rise of the heating wire 32 for preheating is not limited to the diameter of the first roll R1 becoming equal to or less than the first diameter. For example, the controller 80 calculates the remaining amount (length) of the first web W1 remaining on the first roll R1 based on the detection result of the remaining amount sensor 120, and calculates the remaining amount (length) of the first web W1 remaining on the first roll R1. If it is determined that the temperature has fallen below a predetermined value, the temperature of the heating wire 32 may begin to rise for preheating.

Next, when the remaining amount sensor 120 detects that the diameter of the first roll R1 (original fabric diameter) has become equal to or less than the second diameter (<first diameter), the web W feeding device transports the web (not shown). Stop the mechanism. At this time, the driving section 14 of the first support section 10 of the web splicing device 100 also stops operating (step S2). In other words, in step S2, conveyance of the first web W1 is stopped. Even when the operation of the web W supply device is stopped, tension is still acting on the first web W1 in the transport direction A in which the web W1 has been transported so far.

Note that, similarly to step S1, the trigger for stopping the conveyance of the first web W1 in step S2 is that the remaining amount of the first web W1 remaining on the first roll R1 is a second predetermined value (<first predetermined value ) or below.

During the period until the diameter of the first roll R1 (original fabric diameter) changes from the first diameter to the second diameter (from the start of temperature rise of the heating wire 32 until the conveyance of the first web W1 is stopped), The temperature of the heating wire 32 rises to a predetermined preheating temperature. The controller 80 controls the heating of the welded portion of the first web W1 and the second web W2 by the preheating mechanism based on the temperature of the heating wire 32 detected by the temperature sensor 60 (which measures the preheating temperature of the preheating mechanism). .

Although it depends on the materials of the first web W1 and the second web W2, the first web W1 and the second web W2 can be heated up to a temperature of 140°C to 180°C by a preheating mechanism (here, the heating wire 32). The first web W1 and the second web W2 are preheated (within a temperature range that does not exceed the melting points of the second web W2).

Next, the controller 80 controls the operation of the joining member driving section 44 to bring the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 closer to each other, thereby moving the sealing

surface

30a, 40a between the sealing

surfaces

30a and 40a. , the first web W1 and the second web W2 in an overlapping state are sandwiched. Preferably, the controller 80 controls the operation of the joining member drive unit 44 at the same time as stopping the conveyance of the first web W1, so that the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 are connected to each other. The first web W1 and the second web W2, which are overlapped, are sandwiched between them. Further, the controller 80 controls the SSR 36 to adjust the temperature of the heating wire 32 to a second target temperature (first web The temperature is increased to a predetermined temperature higher than the melting points of W1 and the second web W2. As a result, the first web W1 and the second web W2 are welded between the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 (step S3).

Next, the controller 80 controls the first web W1, which is disposed between the first support section 10 to which the first roll R1 is attached and the joining mechanism 50, for example, on the conveyance path of the first web W1. The first web is held between the first bonding member 30 and the second bonding member 40 while being heated by driving a dancer roller around which the first web W1 of a storage mechanism (not shown) is wound. By pulling W1 (unnecessary first web W1) toward the first roll R1, the part of the first web W1 closer to the first roll R1 than the welded part with the second web W2 is heated and tensioned. It is fused (step S4).

Note that instead of driving the dancer rollers, the controller 80 controls the drive unit 14 of the first support unit 10 (to rotate the support shaft 12 that supports the first roll R1 in the direction RD1 opposite to that during normal operation). ), the first web W1 held between the first joining member 30 and the second joining member 40 may be pulled toward the first roll R1 and the first web W1 may be cut by melting. The fusing of the first web W1, which is performed by the controller 80 by controlling the drive section 14 of the first support section 10, has been described in the above embodiment, so the explanation will be omitted here.

Thereafter, the controller 80 blows air from the air blowing device 110 provided near the joining mechanism 50 to the welded area between the first web W1 and the second web W2 to rapidly cool the welded area (step S5 ).

Note that, simultaneously with cutting the first web W1, the controller 80 may blow air from the air blowing device 110 to the welded portion of the first web W1 and the second web W2 to rapidly cool the welded portion. In other words, step S4 and step S5 may be performed simultaneously.

Next, the controller 80 controls the operation of the joining member driving section 44 to separate the sealing surface 30a of the first joining member 30 and the sealing surface 40a of the second joining member 40 from each other, and the sealing

surfaces

30a, 40a The first web W1 and the second web W2 are released from being held between them (step S6).

In this state, when the web W feeding device starts transporting the web W (second web W) in the transport direction A by the web transport mechanism (not shown), the controller 80 controls the drive unit 24 of the second support unit 20. The support shaft 22 is rotated in the direction D2 (see FIG. 1) (step S7).

Note that although the controller 80 is described here as controlling the operation of the SSR 36 based on the measurement results of the temperature sensor 60, the controller 80 is not limited to this. For example, the controller 80 may control the operation of the SSR 36 using a timer without using the measurement result of the temperature sensor 60. However, from the viewpoint of accurate temperature control, it is preferable that the controller 80 controls the operation of the SSR 36 based on the measurement result of the temperature sensor 60.

<Additional notes>
Finally, technical ideas that can be understood from the above embodiments will be additionally described below.

A web splicing device according to a first aspect of the present invention includes a first support part, a second support part, a first joining member, and a second joining member. The first support part supports the first roll around which the first web is wound. The second support part supports the second roll around which the second web is wound. The second joining member sandwiches the superimposed first web fed out from the first roll and the second web fed out from the second roll, between the first bonding member and the first web fed out from the second roll. The first joining member and the second joining member weld the first web and the second web sandwiched therebetween.

In the web splicing device according to the first aspect, since web splicing is performed without using tape, it is possible to perform web splicing in a short time, and it is possible to save the labor of the operator.

A web splicing device according to a second aspect of the present invention is the web splicing device according to the first aspect, in which the first joining member and the second joining member The first web is cut by fusing on the side closer to .

In the web splicing device according to the second aspect, web splicing and web fusing are performed using the same mechanism (the first joining member and the second joining member), so the number of components of the web splicing device increases and the device It is possible to suppress the increase in size.

A web splicing device according to a third aspect of the present invention is the web splicing device according to the second aspect, in which the first support portion includes a drive portion that rotates the first roll. The drive unit stops driving the first roll or rotates the first roll in a direction to wind up the first web when cutting the first web.

In the web splicing device according to the third aspect, a tension force directed toward the first roll acts on a portion of the first web upstream from the joining point with the second web, so that smooth fusing of the first web is facilitated. can be achieved.

A web splicing device according to a fourth aspect of the present invention is the web splicing device according to any one of the first to third aspects, and the first joining member has a heating element.

In the web splicing device according to the fourth aspect, the first web and the second web can be welded together by the heat of the heating element provided in the first joining member.

The web splicing device according to the fifth aspect of the present invention is the web splicing device according to the fourth aspect, in which the second joining member has a first surface facing the first joining member. An elastic member is provided on the first surface of the second joining member.

In the web splicing device according to the fifth aspect, the contact area between the web and the heating element can be increased, and the first web and the second web can be firmly joined.

A web splicing device according to a sixth aspect of the present invention is the web splicing device according to the fourth or fifth aspect, further comprising: a temperature sensor that measures the temperature of the heating element; and a controller that controls the heat generation of the heating element. Be prepared. The controller controls the heat generation of the heating element based on the measurement result of the temperature sensor.

In the web splicing device according to the sixth aspect, the heat generation of the heating element is controlled based on the temperature of the heating element, so the first web and the second web can be joined at an appropriate welding temperature.

A web splicing device according to a seventh aspect of the present invention is the web splicing device according to any one of the fourth to sixth aspects, in which the heating element is of an electric heating type and is supplied with current from a DC power source.

When an AC power supply supplies power to a heating element, the power supplied to the heating element may become unstable in areas where the voltage of the power supply source is unstable. On the other hand, since the web splicing device according to the seventh aspect uses a DC power source, the voltage is stable, and the amount of heat generated by the heating element is easily controlled to a predetermined amount at all times. Furthermore, when using a DC power source, the web splicing device tends to be more compact than when using an AC power source.

The web splicing device according to an eighth aspect is the web splicing device according to any one of the first to seventh aspects, wherein the melting point of the first web and the second web is The method further includes a preheating mechanism for preheating the welding portions of the first web and the second web at a temperature below .

In the web splicing device according to the eighth aspect, since the welding locations of the first web and the second web are preheated, the welding locations of the first web and the second web are likely to be uniformly and firmly welded, and the welding locations of the first web and the second web can be easily and firmly welded. Highly reliable.

The web splicing device according to the ninth aspect is the web splicing device according to the eighth aspect, and further includes a first sensor and a controller. The first sensor measures the preheating temperature of the preheating mechanism. The controller controls heating of the welding location between the first web and the second web by the preheating mechanism. The controller controls the preheating mechanism based on the measurement result of the first sensor.

In the web splicing device according to the ninth aspect, the preheating temperature of the welding location of the first web and the second web can be appropriately controlled by control using the first sensor.

The web splicing device according to the tenth aspect is the web splicing device according to the eighth or ninth aspect, in which at least one of the first joining member and the second joining member functions as a preheating mechanism.

In the web splicing device according to the tenth aspect, since at least one of the first joining member and the second joining member used for welding is also used as a preheating mechanism, the first web and the second joining member are It is possible to preheat the welding area.

The web splicing method according to the eleventh aspect of the present invention includes a first web that is unwound from a first roll supported by a first support part, and a second web that is unwound from a second roll that is supported by a second support part. It is a web joining method. The web joining method includes a step of sandwiching a first web and a second web between a first joining member and a second joining member. Further, the web joining method includes a step of welding the first web and the second web sandwiched between the first joining member and the second joining member by the first joining member and the second joining member.

In the web splicing method according to the eleventh aspect, since web splicing is performed without using tape, web splicing can be performed in a short time, and the labor of the worker can be saved.

The web joining method according to the twelfth aspect of the present invention is the web joining method according to the eleventh aspect, in which when welding the first web and the second web by the first joining member and the second joining member, The method further includes the step of cutting the first web by melting at a side closer to the first roll than the welded portion of the first web to the second web.

In the web splicing method according to the twelfth aspect, since web splicing and web fusing are performed using the same mechanism (first splicing member and second splicing member), the number of components of the web splicing device increases and the web Enlargement of the splicing device can be suppressed.

The web joining method according to the thirteenth aspect of the present invention is the web joining method according to the eleventh or twelfth aspect, in which the melting point of the first web and the second web is The method further includes the step of preheating the welded portion of the first web and the second web at a temperature lower than that of the first web and the second web.

In the web splicing method according to the thirteenth aspect, since the welding portions of the first web and the second web are preheated, the welding portions of the first web and the second web are likely to be uniformly and firmly welded, and the welding portions of the first web and the second web are easily welded evenly and firmly. Highly reliable.

10 Support part, first support part 14 Drive part 20 Support part, second support part 30 First joining member (preheating mechanism)
32 Heating wire (heating element)
40 Second joining member 40a Seal surface (first surface)
42 Elastic member 60 Temperature sensor (first sensor)
80 Controller 90 DC power supply 100 Web splicing device R1 Roll, first roll R2 Roll, second roll W1 Web, first web W2 Web, second web

Claims

a first support part that supports a first roll around which a first web is wound;
a second support part that supports a second roll around which a second web is wound;
a first joining member;
a second bonding member that sandwiches the first web fed out from the first roll and the second web fed out from the second roll in an overlapping state between the first bonding member;
Equipped with
The first joining member and the second joining member weld the first web and the second web sandwiched therebetween,
Web splicing device.
The first joining member and the second joining member melt-cut the first web at a side of the first web closer to the first roll than a welded part with the second web.
A web splicing device according to claim 1.
The first support section has a drive section that rotates the first roll,
The drive unit stops driving the first roll when melt-cutting the first web, or rotates the first roll in a direction to wind up the first web.
A web splicing device according to claim 2.
The first joining member has a heating element,
A web splicing device according to any one of claims 1 to 3.
The second joining member has a first surface facing the first joining member,
An elastic member is provided on the first surface.
The web splicing device according to claim 4.
a temperature sensor that measures the temperature of the heating element;
a controller that controls heat generation of the heating element;
further comprising;
The controller controls heat generation of the heating element based on a measurement result of the temperature sensor.
A web splicing device according to claim 4 or 5.
The heating element is of an electric heating type and is supplied with current from a DC power source.
A web splicing device according to any one of claims 4 to 6.
A preheating mechanism that preheats the welding point of the first web and the second web at a temperature lower than the melting points of the first web and the second web before welding the first web and the second web. Further prepare,
A web splicing device according to any one of claims 1 to 7.
a first sensor that measures the preheating temperature of the preheating mechanism;
a controller that controls heating of the welding location between the first web and the second web by the preheating mechanism;
further comprising;
The controller controls the preheating mechanism based on the measurement result of the first sensor.
A web splicing device according to claim 8.
At least one of the first bonding member and the second bonding member functions as the preheating mechanism.
A web splicing device according to claim 8 or 9.
A web joining method for joining a first web paid out from a first roll supported by a first support part and a second web paid out from a second roll supported by a second support part,
sandwiching the first web and the second web between a first joining member and a second joining member;
Welding the first web and the second web sandwiched between the first joining member and the second joining member by the first joining member and the second joining member;
A web splicing method comprising:
cutting the first web by the first joining member and the second joining member at a side closer to the first roll than the welding location of the first web to the second web;
The web splicing method according to claim 11, further comprising:.
Before welding the first web and the second web, the step of preheating the welding point of the first web and the second web at a temperature lower than the melting points of the first web and the second web, The web splicing method according to claim 11 or 12.