TW201540634A - Web splicing device - Google Patents

Abstract

A web-splicing device for connecting the cut end of an old film (W1) traveling in one direction, and the tip of a new film (W2) drawn in the same direction. Attachment rollers (1, 2) are provided above and below the path of travel of the old film, and a cutting blade (6) is provided upstream. The tip of the new film is adhered to the lower-side attachment roller (2) via an adhesive tape (T2), and an adhesive tape (T1) is adhered to the upper-side attachment roller (1). In this state, the two films (W1, W2) are spliced to one another by: producing contact pressure between the upper and lower attachment rollers (1, 2) with the old film (W1) interposed therebetween; cutting the old film using the cutting blade (6); thereafter, rotating both rollers (1, 2) in the delivery direction of the two films (W1, W2), and aligning the cut end of the old film and the tip of the new film with one another; and adhering the adhesive tape (T1, T2) along the two aligned ends.

Description

Omentum splicing device

The present invention relates to a web joint device in which a sheet, a plastic film, a metal foil, or the like is laminated with a single layer or a plurality of layers.

Such a mesh film splicing device is provided, for example, in a region where the film (web) is wound up in the film processing step. Usually, the mesh film is transported in the front-rear direction in the splicing device (see the following embodiment), and the mesh film is fed to the subsequent stage. Net device, etc.

As the web film splicing device, there is a technique in which a front end of a new web (which is adjacent to the old web) extending in the front-rear direction (conveying direction) is overlapped with the web which is transported (hereinafter, the web which is being sent out is called When the "old web" is overlapped, the overlapping portion is cut, and the bonding tape is attached to the rear end of the cut old web and the front end of the new web (see Patent Document 1, Patent Application No. 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 10-305950

In the above-mentioned web film splicing apparatus, after the old and new web films are overlapped and cut, the old web film is stopped (sending) until the two webs are connected (continuously connected) with the bonding tape attached thereto. During the stop period, the accumulation device or the like disposed in the subsequent stage of the splicing device and the subsequent step Continuously send out the omentum.

At this time, the amount of accumulated film of the accumulation device is determined according to the time required for the connection operation of the splicing device, and the longer the required time is, the larger the accumulation amount is, and the size of the accumulation device or the like is increased.

Furthermore, in the above-mentioned prior art web joining device, when the two webs are cut, the portion of the web is held by the web holder before the overlapping portion is pressed, and the cut portion is sucked and held on one side. After the rear portion of the omentum (cutting end) and the front end of the new omentum are removed, the excess portion of the two oment films is removed, and then the bonding tape is attached to the bonding tape (see FIGS. 1(B) to (E) of Patent Document 1).

At this time, the web retainer retains the web by the approach/separation based on the movement in the up-and-down direction of the web (Fig. 1 (B), (c) of the document 1), and the web is attached to the web to retain the upper side. Thereafter, the upper tape holder spacer tape is pressed against the upper surface of the mesh film to adhere to the bonding tape (Fig. 1 (D) of the document 1), and the lower side tape is removed after the lower mesh film holder is retracted. The holding tape is pressed against the web to adhere to the bonding tape (Fig. 1 (E) of the document 1).

If the action of moving the web holder or the holder up and down is performed in this way, the corresponding operation time and switching time are required, which will inevitably lead to a longer connection time of the web.

In recent years, it has been required to shorten the processing time for the above-mentioned film processing steps and the like, and for this reason, the shortening of the web connection time of the splice device is no exception.

Further, the operation of making the web holder or the holder up and down is complicated, the configuration thereof is complicated, and the operation control thereof is also troublesome.

The present invention has been made in view of the above circumstances, and a splicing device and a method thereof that are different from the prior art are the first problems, and it is a second problem to shorten the reticle connection time in the device (method).

In order to achieve the above object, the present invention is characterized in that an old web film which is transported by a pair of rolls is placed upside down, and the upper side roll is pressed against the upper surface of the old web, and the front end of the new web is adsorbed and supported on the lower side. Roller, set it to the lower surface of the old omentum; first, In the state in which the transport of the old web is suspended, the two rolls are pressed against the old web and pressed (contacted and pressed), and the old web is cut in this state. At this time, in the case where the old web film before and after the cutting portion is adsorbed, the pressure bonding of the two rolls through the old web film may be performed after the cutting of the old web film. Further, the bonding tape is adsorbed to at least one of the upper and lower rollers before or after the cutting. Next, the bonding tape is adsorbed to the roller, and the two rollers are rotated to press the two rollers to transport the new and old webs, and the bonding tape is attached to the two webs to be connected.

In this manner, the web film transport suspension time is obtained by pressing the two rolls between the old web films and releasing the pressure contact, and the time can be shortened as compared with the prior art, thereby achieving the second problem described above. Further, the above-described first problem can be attained by utilizing the splicing structure of the two rolls which is not previously a novel configuration.

In the continuation of the two webs, in the state in which the two rolls are crimped, the length of the old web from the crimping point to the cut end of the old web and the lower side attaching roller from the crimping point to the new The circumference of the front end of the omentum is equal (refer to Fig. 3 (a)), when the two rolls rotate, the cut end of the old web is in a state of docking with the front end of the new web, and the joint strip is spread over the ends of the mating. Attached (refer to Figure 3 (c)). On the other hand, if the circumference of the lower attachment roller from the crimping point to the front end of the new web is shorter than the length of the old web from the crimping point to the cut end of the old web, then When the two rolls are rotated, the cut end of the old web is overlapped with the front end of the new web, and the end of the overlap is used as a boundary line, and the joint tape is applied over the two webs.

In such a case, if the joining tape is adsorbed to one of the two rolls, the joining tape may be placed between the ends of the two webs with the edge of the two webs as a boundary line. Further, when the joining tapes are respectively adsorbed to the two rolls, the two joining tapes may be attached to both sides between the ends of the two webs with the edge of the web as a boundary. Further, in the case of a double-sided tape in which both sides of the bonding tape are an adhesive layer, the tape can be interposed between the both ends (see FIG. 4).

The specific structure of the mesh film splicing device of the present invention is a mesh film splicing device for connecting the cut end of the old web film conveyed in one direction and the front end of the new web film pulled out from the unwinding device in the above-mentioned direction, which can be used Constructed as follows: above the old omentum transport path On the side, a pair of upper and lower webs are attached to the upper and lower attachment rollers, and a cutter for the old web is disposed in front of the transport path of the upper attachment roller; the front end of the new web is adsorbed to the lower attachment roller. And absorbing the bonding tape to at least one of the two rolls; pressing the upper and lower applicator rolls through the old web, and cutting the old web by the cutter at the pressure contact point of the two rolls, The roller rotates in the above-mentioned conveying direction of the two webs to terminate the joint strip with the cut end of the old web and the front end of the new web, thereby continuing the cut end of the old web and the front end of the new web.

In this configuration, the bonding tape may be adsorbed to the lower attachment roller, and the bonding tape may be a double-sided tape having both the front and the back layers; after cutting the old web, the two rollers may be used. Rotating along the conveying direction of the two oment membranes, so that the bonding tape is between the cut end of the old omentum and the front end of the new omentum and with the two ends, and the cut end (rear end) of the old omentum and the front end of the new omentum Overlap and join.

Further, the bonding tape may be adsorbed to the upper attachment roller, and the rotation stopper position adjusting weight may be attached to the upper attachment roller, and when the upper and lower attachment rollers are pressure-bonded by the weight, two The roller is rotated in the conveying direction of the two webs to connect the bonding tape to the cut end of the old web and the front end of the new web, so that the adsorbed bonding tape is located in the circumferential direction of the attaching roller from the crimping point upward. The point of deviation.

In this case, if the weight can be rotated/fixed around the axis of the upper attachment roller, the rotation stop position of the roller can be arbitrarily adjusted, so that the adhesion position of the bonding tape can be adjusted upward from the pressure contact point. Any position (dot) where the circumferential direction of the attaching roller deviates.

Further, in the above-described respective configurations, if the bonding tape is adsorbed to the lower attachment roller, a configuration may be adopted in which a new web transport direction of the lower attachment roller is provided, and the lower attachment roller can be crimped. a retracting transfer roller on which the bonding tape is adhered to the front end of the new web which is adsorbed between the lower side attaching roller and the transfer roller; the transfer roller and the lower side attaching roller In the state of pressure bonding, the transfer roller is rotated in accordance with the rotation of the lower attachment roller, and the front end of the new web attached to the bonding tape is transferred and adsorbed to the lower attachment roller.

Usually, the adhesive tape is attached to the lower attachment roller, and the adhesive layer of the bonding tape must be positive. When the surface is applied to the lower attachment roller, first, the bonding tape is adsorbed to the roller, and thereafter, the front end of the new web is attached (fixed) to the bonding tape. However, if a transfer roll is used, the bonding tape may be attached to the end of the new web after the new web is adsorbed to the transfer roll, so that workability is preferable.

Further, if the front end of the new web is cut on the transfer roller, the winding length (adsorption length) of the new web for the transfer roller (lower attachment roller) can be set as desired by cutting the leading end. By.

The mesh film splicing device of each of the above configurations may be configured such that when the front end of the new web is adsorbed to the lower attaching roller, the vicinity of the front end of the new web is adsorbed and held by the adsorbing device. In this way, since the front end of the new web is difficult to move, the operation of sucking the front end thereof to the lower attaching roller can be smoothly performed.

Further, when the pressure contact surface of at least one of the upper and lower application rollers is formed of an elastic material, a desired pressure contact force can be obtained, and smooth conveyance of the web film can be ensured.

The specific structure of the web film splicing method of the present invention is a web film splicing method for connecting the cut end of the old web film conveyed in one direction and the front end of the new web film pulled out from the unwinding device in the above-mentioned direction, which can be adopted The lower side of the transport path of the old web is provided with a roller attached to the upper and lower sides of the old web, and the front end of the new web is adsorbed to the lower attaching roller, and the bonding tape is adsorbed. And at least one of the two rollers, the upper and lower applicator rollers are brought close to each other and are pressed against the old web film, and in this state or before the crimping, the conveying path of the crimping points of the two rollers are pressed by the cutter The old web of the front stage, after which the two rolls are rotated, the new and old webs are transported in the above conveying direction, and the joint strip is connected to the cut end of the old web and the front end of the new web to join the cut of the old web. End with the front end of the new omentum.

In this configuration, when the bonding tape is adsorbed to the lower attachment roller, the bonding tape can be configured such that the both sides of the bonding tape are both double-sided tapes on the front and back sides, and the old tape is cut off. After the omentum, the two rolls are rotated in the above-mentioned conveying direction of the two webs, and the joint strip is interposed between the cut end of the old web and the front end of the new web and with the ends, so that the cut end (back end) of the old web is Overlap and join the front end of the new omentum.

Furthermore, the above-mentioned respective web film joining method may be such that the new web film is passed through the new web film transporting direction of the lower side attaching roller, and the lower side attaching roller can be pressed and retracted by the transfer roller and the lower side. Between the side attachment rollers, the new web is passed through the transfer film, the transfer roller is pressed against the lower attachment roller, and the new web is adsorbed to the transfer roller. In this state, a new web is formed on the transfer roller. The leading end is cut and the joint tape is attached to the tip end thereof, and thereafter, the transfer roller is rotated in accordance with the rotation of the lower attachment roller, whereby the front end of the new web of the bonded tape is transferred and adsorbed to the lower attachment roller.

Further, in the method of joining the webs of the respective configurations, when the bonding tape is adsorbed to the upper attaching roller, the weight of the rotation stop position can be attached to the upper attaching roller, and the upper and lower attaching rollers can be attached. When the weight is crimped, the adsorbed bonding tape is located from the above manner in such a manner that the two rollers are rotated in the conveying direction of the two webs to terminate the bonding tape and the cut end of the old web and the new web. The point where the crimping point is attached to the upper side of the roller is circumferentially offset.

In this case, if the weight can be rotated/fixed around the axis of the upper attachment roller, the rotation stop position of the roller can be adjusted at will, so that the adhesion position of the bonding tape can be adjusted to be attached from the pressure contact point to the upper side. Any position (dot) where the circumferential direction of the roller is deviated.

Further, when the pressure contact surface of at least one of the upper and lower application rollers is formed of an elastic material, a desired pressure contact force can be obtained, and smooth conveyance of the web film can be ensured.

Further, in the above-described respective web film joining method, when the front end of the new web film is adsorbed to the lower side attaching roller, the vicinity of the front end of the new web film is adsorbed and held by the adsorbing device.

Since the present invention is constructed in the above manner, the mesh film can be smoothly connected in a simple configuration.

a‧‧‧Two-roller crimping point

F‧‧‧Frame of the omentum splicing device of the invention

S‧‧‧ The retina device of the invention

T1‧‧‧ joint belt

T2‧‧‧ joint belt

T3‧‧‧ joint belt

W‧‧‧ omentum (film)

W1‧‧‧ omentum (film)

W2‧‧‧ omentum (film)

1‧‧‧Upper attachment roller

1a‧‧‧Sucking Department

2‧‧‧Under the attached roller

2a‧‧‧Sucking Department

3‧‧‧ O-film guiding roller

4‧‧‧Exhaust hose

5‧‧‧vacuum box for mesh membrane cutting and holding

5a‧‧‧ cylinder

6‧‧‧Cutter

7‧‧‧Support block

8‧‧‧ cylinder

8a‧‧‧ Guide rod

10‧‧‧ Pedestal

11a, 11b‧‧‧ Lower side attached roller lifting cylinder

12‧‧‧Under roller attachment roller rotation actuator

13‧‧‧New mesh membrane standby position vacuum box

14‧‧‧New web film lifting roller

14a‧‧‧Cylinder

14b‧‧‧ cylinder

15a‧‧‧Cylinder

16‧‧‧Transfer roller

16a‧‧‧Sucking Department

17‧‧‧Rotary actuator

18‧‧‧The web film feeding roller of the device

19‧‧‧Removal of the web transport stop

20‧‧‧ cylinder

22‧‧‧Swing piece

31‧‧‧Bolts and nuts

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view showing the operation of an embodiment of a web joint device of the present invention.

Fig. 1B is a schematic view of the operation of the embodiment.

Fig. 1C is a schematic view of the operation of the embodiment.

Fig. 1D is a schematic view of the operation of the embodiment.

Fig. 1E is a schematic view of the operation of the embodiment.

Fig. 1F is a schematic view of the operation of the embodiment.

Fig. 1G is a schematic view of the operation of the embodiment.

Fig. 1H is a schematic view of the operation of the embodiment.

Fig. 1I is a schematic view of the operation of the embodiment.

Fig. 1J is a schematic view of the operation of the embodiment.

Fig. 1K is a schematic diagram of the operation of this embodiment.

Fig. 1L is a schematic view of the operation of the embodiment.

Fig. 2A(a) is a schematic view when viewed from the right side of Fig. 1A of the embodiment, and Fig. 2(b) is a left side view of the main part.

Fig. 2B is a schematic plan view of Fig. 2A of the embodiment.

Fig. 3 is a schematic view showing the operation of the embodiment, in which (a) before the web is cut, (b) when the joint tape is attached, and (c) is attached.

Fig. 4 is a schematic view showing the action of another embodiment.

Fig. 5A is a schematic view showing the operation of another embodiment of the reticulated web device of the present invention.

Fig. 5F is a schematic view of the operation of the embodiment.

Fig. 5J is a schematic view of the operation of the embodiment.

Fig. 5L is a schematic view of the operation of the embodiment.

1A to 1L, FIG. 2A and FIG. 2B show an embodiment of the present invention, and the mesh film splicing device S of the present embodiment is provided in a roll from a two-axle bogie automatic feeding device (not shown). In the region of the film (web) of the film-forming processing step, a film cleaning device or the like is provided in the subsequent stage by means of an accumulation device (not shown) and a dancer device (not shown). The film (old web) W1 is conveyed in its frame-like frame F from the rear side (the left side of FIG. 1A) toward the front side (the right side of FIG. 1A), and the attaching rolls 1, 2 are provided below the conveying path. The length or the outer diameter of the two rolls 1 and 2 may be determined as appropriate. In the present embodiment, the length of the roll 1 is 1600 mm, the outer diameter is 125 mm, and the outer diameter of the roll 2 is 250 mm.

The two rolls 1 and 2 are partially formed of a punched metal plate, and serve as the absorbing portions 1a and 2a (see FIG. 2A) of the joining tape T, and the inside thereof is appropriately sucked. The size or position of the absorbing portions 1a and 2a is appropriately determined so that the joining tape T can be smoothly sucked without causing suction leakage. For example, if the bonding tape T has a length of 1500 to 1600 mm and a width of 50 mm, it is set to be the same as or slightly smaller than the tape T. Therefore, when the joint tape T is placed on the punched metal plate portions (sucking portions) 1a, 2a, the joint tape T is adsorbed on the surface of the roll. In the figure, a 3-series web W guide roller and a 4-series suction hose.

The circumferential surface of the upper side attaching roller 1 is an elastic surface of a resin layer (rubber), and can be taken out to the left side (the front side direction of FIG. 1A) with respect to the frame F as an operation side (refer to the dotted line state of FIG. 2A). . At the time of the take-out, the air suction hose 4 connected to the upper side attachment roller 1 is pulled together with the roller 1 to its guide groove 4a.

Further, on the shaft to which the upper roller 1 is attached, a rotation stop position adjusting weight 30 (see FIG. 2A) is attached, and the upper attachment roller 1 is stopped at a specific rotational position by the weight 30 for a long time. As shown in FIG. 2A(b), the upper portion of the roller 30 of the weight 30 is formed into two branch pieces, and the bolt nut 31 is screwed to the two pieces, and the bolt nut 31 can be loosened and the weight 30 can be rotated to The desired position around the roller shaft is then fixed in this position by tightening the bolt nut 31. Therefore, the specific rotational position of the upper attachment roller 1 can be arbitrarily changed. In the present embodiment, if there is no other restraining force, the upper attachment roller 1 can be located by the weight 30, as shown in Fig. 3(a), with the bonding tape T1 located at the crimping point a of the two rollers 1, 2 The desired angle θ1, for example, 137.5 degrees, is rotated and stopped at any rotational position.

A pair of front and rear vacuum boxes 5, 5 are disposed in front of the web transport path of the upper side attaching roller 1, and the cutter 6 is located between the pair of vacuum boxes 5, 5. The vacuum box 5 of the front stage (left side of Fig. 1A) can be lifted and lowered by the cylinder 5a with respect to the support block 7 described below, and when the cutter 6 is replaced, it can be raised to facilitate the replacement. The cutter 6 can also be raised and lowered by the cylinder with respect to the support block 7 or the like.

The upper side attachment roller 1, the vacuum box 5, and the cylinder 5a are attached to a support block 7, which is supported by the cylinder 8 on the frame F so as to be movable up and down. The cylinder 8 has guide bars 8a, 8a on both sides thereof, and the support block 7 can be stably raised and lowered. Further, the following cylinders 11a, 11b, 14a, 14b, 15a, and 20 each have a guide rod, and the stable rod can be advanced and retracted, and the description of the guide rod is omitted.

When the support block 7 is lowered by the cylinder 8, the upper attachment roller 1, the vacuum box 5, and the cutter 6 are in contact with the transport path of the old web W1, and the pair of vacuum boxes 5, 5 are attracted to the web W1. At the same time, the cutting is performed by the cutter 6 while the web W1 is adsorbed and supported between the two vacuum boxes 5 and 5.

When the lower attachment roller 2 is in standby, the bonding tape T2 adsorbed to the punched metal plate portion (sucking portion) 2a shown in Fig. 3(a) is located at the pressure contact point a of the two rollers 1, 2 The desired angle θ2, for example 68.8 degrees. In addition, the lower attachment roller 2 is pressed (nip) with a transfer roller 16 to be described later at a desired angle, for example, about 180 degrees.

Further, the rotational position θ2 of the lower attachment roller 2 and the rotational position θ1 of the upper attachment roller 1 are set as follows: the two sticks 1, 2 are pressed from the two rollers 1, 2 shown in FIG. 1G When the pressure contact point a (see FIG. 3(a)) is rotated, the bonding tapes T1 and T2 adsorbed to the two rolls 1 and 2 are overlapped (the outer surfaces of the two rolls 1, 2 from the pressure contact point a to the outer side of the bonding tapes T1 and T2) In the present embodiment, since the outer diameter of the roller 1 is 125 mm and the outer diameter of the roller 2 is 250 mm, the former θ1 is set to be 137.5 degrees from the pressure contact point a, and the latter θ2 is used. It is set to a position of 68.8 degrees from the above-mentioned crimping point a. Therefore, the positions θ1 and θ2 are appropriately set in accordance with the outer diameters of the rolls 1 and 2.

The lower attachment roller 2 is provided on a susceptor 10 that can be lifted and lowered by two cylinders 11a and 11b having different sizes (see FIG. 2A). The susceptor 10 is lifted and lowered by a large cylinder 11a by a desired height, for example, 300 mm, and is further raised and lowered by a small cylinder 11b to a desired height, for example, 25 mm. In this way, the double cylinder system of different sizes is used because the long telescopic cylinder has a low lifting precision and a large size. Further, the two cylinders are arranged in parallel to suppress the height, and if there is no height limit, they may be arranged in series.

Further, the base 10 is provided with a rotary actuator 12 for rotating or stopping the lower attachment roller 2. The lower attachment roller 2 is rotated or stopped at a desired angle by the rotary actuator 12.

In the front stage of the lower side attachment roller 2, a vacuum box 13 for a standby position which can be raised and lowered by two cylinders 14a and 14b having different sizes is provided, and a lifting roller 15 which can be lifted and lowered by the cylinder 15a is provided in the front stage.

The transfer roller 16 whose surface is subjected to a non-adhesive treatment such as fluororesin coating or the like is undulated by the rotary actuator 17 on the front surface of the frame F (the right side surface of FIG. 1A), which can be pressed against the lower side attachment roller 2 Pick up or retreat. The roller 16 is constantly erected and retracted, and is rotated 180 degrees to the right from the standby state by the lodging, and is pressed against the lower attachment roller 2 (refer to FIG. 1B and the like). A part of the surface of the roller 16 is also formed by a punched metal plate 16a, and the inside thereof is suctionable (vacuumable) (refer to Fig. 2A).

The punched metal plate portion (sucking portion) 16a is a circumferential length of the roller 16 from the point where the two rollers 2, 16 are crimped, and a punched metal plate portion from the crimping point to the lower side attaching roller 2 ( The circumference of the absorbing portion 2a is equal.

On the upper surface of the frame F, a delivery roller 18 and its roller rotation stopper 19 are provided, and the stopper 19 can be advanced and retracted by the cylinder 20 (refer to Figs. 1A and 1G). Therefore, when the stopper 19 is pressed against the roller 18 in progress through the web W1, the web W1 is stopped.

The configuration of this embodiment is as described above, and the operation thereof will be described below.

In FIG. 1A, generally, the web (old web) W1 is self-winding shaft (not shown) at the connection. The inside of the apparatus S is transported back and forth (in the FIG. 1A, from left to right), and is sent out from the feed roller 18 to an accumulation device or the like.

In the delivery state, when the terminal of the web W1 being conveyed (delivered) is approached, or at an appropriate timing before it, the standby position is first raised by the vacuum box 13 (the state in which the self-chain line is rising toward the solid line in FIG. 1A) For example, the rise is 125 mm), and the upper surface thereof is at the same position (height) as the upper surface of the lower attachment roller 2. Next, the inside of the vacuum box 13 is evacuated (the vacuum valve is turned ON (open, the same applies hereinafter)), and at the same time or the other unwinding shaft (not shown) is pulled out of the replacement web (new web) W2. As shown in FIG. 1A, it is adsorbed to the vacuum box 13 for standby position, and its front end W2' is placed (lapped) on the lower side attachment roller 2. At this time, as shown in FIG. 1A, the front end of the new web W2 is dropped to the lower side of the lower side attachment roller 2, and the center is aligned manually.

Next, the upper and lower attachment rolls 1 and 2 are evacuated. Before the pumping state or before pumping, the upper side attaching roller 1 is pulled along the left side (near the front side of FIG. 1A), so that the joining tape T1 is pressed toward the roller side with its non-adhering surface as the roller side. Part (exhaust surface) 1a. Thereafter, the upper attachment roller 1 is pushed back and set at a predetermined position. At this time, the roller 1 is positioned at a desired rotation angle by the weight 30. That is, as shown in FIG. 3(a), the bonding tape T1 is located at a desired angle θ1:137.5 degrees from the pressure contact points a of the two rolls 1, 2.

The lower attachment roller 2 is rotated (rotated) 180 degrees from the standby position, for example, from the standby position, and the positioning portion (sucking surface) 2a is placed at the attachment preparation position of the new web W2 (FIG. 1B). Next, the transfer roller 16 is poured down so as to be pressed against the lower attachment roller 2 via the new web W2 (Fig. 1B), and the transfer roller 16 is evacuated. In this state, if necessary, the new web W2 is further pulled out, and it is wound and adsorbed to the transfer roller 16 in a counterclockwise direction (for example, 180 degrees counterclockwise in FIG. 1B) with a desired length. At this time, the absorbing portion 16a of the transfer roller 16 is located further inside than the front edge of the wound new web W2, and adsorbs and supports the new web W2.

In the adsorption state, the front edge of the new web W2 is spread over its entire width by hand. The length is cut off. The cut end becomes the front end of the new web W2, and the cut edge sheet is appropriately removed. At the time of the cutting, a cutting groove is formed on the transfer roller 16 over the entire length thereof to receive (hold) a cutter that penetrates the new web W2. After the cutting, the bonding tape T2 is adhered to the inner side (roller 16 side), and the center line of the width direction thereof is aligned with the cut end edge of the new web W2, and is attached to the new web W2 ( Figure 1C).

At this time, if the front end edge of the new web W2 is linear, the front end edge thereof can be attached to the joint tape T2 adsorbed to the transfer roller 16. Further, if the front end edge is not required to cut the front end edge in correspondence with the cutting groove, it is not necessary to perform the cutting.

In the state in which the front end of the new web W2 and the joining tape T2 are adsorbed to the transfer roller 16, the evacuation of the standby position vacuum chamber 13 (which is set to vacuum OFF) is stopped and lowered. Thereafter or at the same time, as shown in FIG. 1C, the lower attachment roller 2 is rotated 180 degrees to the left by rotating the actuator 12. As the roller 2 rotates, the transfer roller 16 also rotates, and the new web W2 with the bonding tape T2 is fed to the lower attachment roller 2, and the front and lower sides of the new web W2 to which the bonding tape T2 is attached are attached. The absorbing portion of the roller 2 corresponds to the lower end portion of the new web W2 to which the joining tape T2 is attached, and is transferred to the lower attaching roller 2 by stopping the evacuation of the inside of the transfer roller 16 at the time of the corresponding or corresponding.

At this time, the punched metal plate portion (sucking portion) 16a of the transfer roller 16 is punched by the circumference from the point at which the two rolls 2, 16 are crimped, and from the pressure contact point to the lower side attaching roller 2. Since the circumference of the metal plate portion (the absorbing portion) 2a is equal, the front end portion of the new web W2 to which the joining tape T2 is attached is transferred (transferred) to the punching metal plate portion 2a of the lower side attaching roller 2. Therefore, at the time point (standby state) after the lower attachment roller 2 is rotated by 180 degrees, as shown in FIG. 1D and FIG. 3(a), the bonding tape T2 is located at the desired pressure point a from the two rollers 1, 2. The angle θ2: 68.8 degrees. The adjustment of the angle θ2 can also be performed after the end portion of the new web W2 to which the bonding tape T2 is attached is adsorbed to the lower attachment roller 2.

Further, since the surface of the transfer roller 16 is subjected to the anti-adhesive treatment, the transfer of the bonding tape T2 from the transfer roller 16 toward the lower attachment roller 2 can be smoothly performed. Also, although the joint belt T2 and the new web W2 The front end is adsorbed to the transfer roller 16, but the bonding tape T2 or the like can be easily transferred from the transfer roller 16 to the roller 2 by the frictional force or the like of the web W2 and the roller 2. At this time, it is possible to provide a mechanism for enhancing the pumping force of the lower side attaching roller 2 with respect to the pumping force of the transfer roller 16, or interrupting the pumping of the roller 16 during the transfer.

Thereafter, as shown in FIG. 1D, the transfer roller 16 is erected (retracted from the lower attachment roller 2 and returned to the standby position). At this time or before or after, the re-extraction in the vacuum chamber 13 in the standby position can be performed to support (hold) the new web W2.

By the above action, the joining (stacking) of the webs W1, W2 is completed (the state of Fig. 1D), and as of this time, the old web W1 is continuously transported (continuously sent out). When the completion button (ON: ON) is pressed after the preparation is completed, as shown in FIGS. 1D to 1E, the lower attachment roller 2, the standby position vacuum box 13 and the elevation roller 15 are raised (for example, 300 mm). , the joint (stack) is ready to be completed. By raising the lift roller 15 and the vacuum position 13 for the standby position, it is possible to prevent the new web W2 from falling down from the lower attaching roller 2, and to prevent the new web W2 from coming off the roller 2 even with a weak adsorption force. .

In this way, the reason why the suction operation of the new web W2 and the joining tape T2 is performed in a state where the lower attaching roller 2 is lowered is that the raising and lowering of the roller 2 and the like takes time, and the working space after the lowering of the roller 2 is large is performed. After the adsorption of the bonding tape T2 or the like is completed, the preparation of the bonding tape T2 and the like is completed, and then the new web W2 is raised to shorten the rise time of the lamination, thereby achieving the lamination time (the web W stops the transport time). shorten.

After the splicing preparation is completed, if the completion button (ON: ON) is pressed, as shown in FIG. 1E to FIG. 1F, first, the roller rotation actuator 19 travels to block the pressure of the old web W1 and the delivery roller 18. Then, the roll of the old web W1 and its feeding device are decelerated and stopped, and the old web W1 stops conveying. By the pressure contact of the roller 18 with the actuator 19, the tensile force from the accumulating device to the old web W1 is blocked, and the tension is not applied to the old web W1 in the splice device S.

Next, as shown in FIG. 1G, the lower attachment roller 2 is further raised (for example, by 25 mm). At the same time, the upper attachment roller 1 is lowered (for example, by 20 mm), and the two rollers 1, 2 are crimped (nip) by the old web W1. At the time of the crimping, the lower side attaching roller 2 bites into the upper side of the elastic surface, the attaching roller 1, for example, 2 mm, so that the old web W1 is surely pinched. At the same time as or after this action, the evacuation of the vacuum box 13 for the standby position is stopped. The lower attachment roller 2 may be set as an elastic surface, or only the lower attachment roller 2 may be set as an elastic surface.

After being pressed against the two rolls 1, 2 or after crimping, as shown in FIG. 1H, the vacuum film boxes 5 and 5 for cutting and holding the old web W1 are evacuated to support the old web W1 fixed therebetween. And the old web W1 is cut by the cutter 6.

At this time, since the old web W1 on both sides of the cutting line is supported by the suction, the cut end does not fall, and the cutting is smoothly performed. If the cutting is not smooth, the cutting time is prolonged, and the connection with the front edge of the new web W2, which will be described later, is difficult to proceed smoothly. Further, since the old web W1 before and after the cutting portion is adsorbed, the pressure bonding between the two rolls 1 and 2 through the old web W1 can be performed after the old web W1 is cut. The cut edge sheet can be appropriately removed.

Further, the distance between the cutting point and the pressure contact point a of the two rolls 1, 2 is set to be the circumference of the roll of the upper side attachment roller 1 from the pressure contact point a to the center point of the width direction of the joint tape T1 (lower side sticker The roller 2 from the pressure contact point a to the center of the width direction of the joint tape T1 is substantially equal.

When the cutting of the old web W1 is completed, as shown in FIG. 1I, the evacuation of the vacuum holding boxes 5 and 5 for cutting and holding is stopped, and the lower attaching roller 2 is placed along the web by the roller actuator 12. The direction of the feed (clockwise in Figure 1I) is rotated. For example, it is rotated by 180 degrees, and along with this rotation, the upper attachment roller 1 also rotates counterclockwise.

When the lower attachment roller 2 is rotated, the suction force of the vacuum storage box 5 for cutting and holding does not hinder the movement of the old web W1, so that the evacuation of the vacuum cassette 5 can be stopped. In this case, the evacuation is stopped after the point at which the old web W1 is separated from the vacuum box 5.

Since the two rolls 1, 2 are pressed together with the rotation of the lower side attaching roller 2, as shown in Figs. 3(a) to 3(b), the web W1 and the new web W2 are also passed by the roll 1. 2 is rotated and sent out (transported to the right of Figure 1J). At this time, the distance between the cutting point of the web film W1 and the pressure contact point a of the two rolls 1, 2 is set to be the roll from the center point of the width direction of the lower side attaching roller 2 from the crimping point a to the joining tape T1. The circumference is approximately equal, so that the rear end (cut end) of the old web W1 is connected to the front end of the new web W2.

If the rear end (cut end) of the web W1 is butted against the front end of the new web W2, and the two rolls 1, 2 are further rotated, as shown in FIG. 3(c), the joint tape to the front end of the new web W2 is attached. The front half of T2 is adhered to the lower surface of the rear end of the old web W1, and the bonding tape T1 adsorbed to the upper side attaching roller 1 is bounded by the above-mentioned pair of wires, and is successively attached to the front end of the new web W2 and The surface of the old omentum W1. Therefore, the new and old webs W1 and W2 are joined and joined by the two joint tapes T1 and T2 (FIG. 1J).

At this time, the abutting portions of the two webs W1 and W2 may not be in close contact, or there may be a gap in which the bonding tapes T1 and T2 are spread over the webs W1 and W2. In this case, the distance between the cut point of the web W1 and the pressure contact point a of the two rolls 1, 2 and the roll of the lower side attaching roll 2 from the press point a to the center point of the width direction of the joint tape T1 One of the circumferential lengths is shortened by the amount of the gap (interval), or the rotational position θ1 of the upper attachment roller 1 and the rotational position θ2 of the lower attachment roller 2 are offset from the above (θ1:137.5, θ2: 68.5). However, even if the gap occurs, the lengths of the joint tapes T1 and T2 are set to be inconsistent with the cut end of the old web W1 or the front end of the new web W2.

If the joining (stacking) of the new and old webs W1, W2 is completed, the pumping of the upper and lower attaching rolls 1, 2 is stopped, and the lower side attaching roller 2 is reversed (counterclockwise in FIG. 1K), for example It is reversed by 180 degrees, and is released after the new omentum W2 is sent back to the unwinding side.

Thereafter, the stopper 19 is retracted to release the crimping of the old web W1 (transport stop), and the webs W1, W2 can be transported in the apparatus S to be sent to the accumulating means of the next stage. Along with this action, the upper and lower attachment rollers 1 and 2 are moved up and down, and the standby position is lowered by the vacuum cassette 13 (FIG. 1L).

In addition, in one of the above acts, the lifting roller 15 is appropriately raised to a desired height. Support the new web W2 to prevent it from falling. Therefore, even if the adsorption force of attaching the new web W2 to the lower side of the roller 2 is lowered, it does not peel off. When the adsorption force is increased, it is not easily peeled off. However, if it is difficult to peel off, it is difficult to smoothly perform the subsequent transfer to the portion where the bonding tapes T1 and T2 are bonded (the action of the separation from the rolls 1 and 2). Therefore, in order to smoothly perform this action, the adsorption force is appropriately set.

The old web W1 after cutting is appropriately taken up by a biaxial index automatic unwinding device during an appropriate period. In the present embodiment, it is taken up during the period of Fig. 1I.

In the above, the joining action of the new and old webs W1 and W2 is completed by using the device S, so that the new unwinding shaft of the two-axis axial frame automatic unwinding device and the old unwinding shaft are turned upside down, the former becomes the old take-up shaft, and the latter becomes The new take-up shaft is rolled out of the new web W2 from the old take-up shaft and then conveyed in the apparatus S to be fed to the accumulating device. At this time, as shown in FIG. 1L, the lifting roller 15 is raised, and the new web W2 does not interfere with the lower attaching roller 2 or the standby position vacuum chamber 13, so that the unwinding shaft of the two-axis axial-frame automatic unwinding device The replacement is carried out smoothly.

Thereafter, the same action is performed to automatically join the web W and to be continuously sent to the washing apparatus or the like by a stacking device or the like.

In the present embodiment, the time during which the web film W is stopped is 3 to 4.5 seconds due to the connection time of the web film W. However, in the prior art of the above-mentioned Patent Document 1, it takes 12 to 13 seconds for the same web film W.

In addition, since the connection between the new and old webs W1 and W2 is completed at the stage of FIG. 1J, the effect of the above-described FIG. 1K and FIG. 1L can be omitted if the slack of the new web W2 at the subsequent connection can be absorbed by the subsequent step.

In the above embodiment, the bonding tapes T1 and T2 are adsorbed to the upper and lower application rollers 1 and 2, but the bonding of the bonding tapes T1 and T2 may be only one of the two rollers 1 and 2. When the bonding tape T1 is adsorbed to the upper attachment roller 1, in Fig. 3(c), only the bonding tape T1 is attached to the upper surface of the two webs W1, W2; if the bonding tape T2 is adsorbed to the lower side When the side roller 12 is attached, in FIG. 3(c), only the bonding tape T2 is attached to the lower surface of the two webs W1 and W2. seam.

Further, if the double-sided tape T3 which is both the front and the back is attached to the lower attachment roller 2, as shown in FIG. 4, the bonding tape T3 is interposed between the rear end of the old web W1 and the new web W2. The seam between the front ends. At this time, in order to overlap the ends of the two webs W1 and W2, the adsorption surface 2a of the bonding tape T3 set to the lower attachment roller 2 is advanced in the clockwise direction by the amount of overlap (for example, one or more half of the length of the bonding tape T3). The position after the desired angle, or the cutting point of the old web W1 is set to be the front stage, with respect to the lower side center point of the lower side attaching roller 2 from the crimping point a of the two rolls 1, 2 to the width direction of the joining tape T3 The circumference of the roll increases the distance between the cut point of the old web W1 and the crimp point a of the two rolls 1, 2.

Further, in the case of the double-sided tape T3, the bonding tape T2 is attached to the lower surface of the new web W2 (refer to FIG. 3(c), but as shown in FIG. 4, it is attached to the new web W2. Upper surface.

5A, 5F, 5J, and 5L, the splicing device S of the present embodiment is set such that the lift roller 15 and the transfer roller 16 of the above-described embodiment are omitted, and the roller is rotated. 19 is attached to the swing piece 22 that is swung by the air cylinder 21, and the feed roller 23 is separately provided to the swing piece 22, and the feed roller 18 is used as a guide roll. Further, the lower attachment roller 2 is rotated by a driver, and the rotation is permitted or stopped by the brake roller 24. In the respective figures of FIG. 5, the same reference numerals as those described above denote the same thing, and the functions thereof correspond to FIG. 5A and FIG. 1A, FIG. 5F and FIG. 1F, respectively, and the functions (FIG.) and FIG. 1B to FIG. 1E and FIG. 1H, 1I, and 1K are substantially the same.

The splicing device S of the present embodiment differs from the above-described embodiment in that, first, as shown in FIG. 5A, the new web W2 is directly adsorbed to the lower attaching roller 2 via the bonding tape T2. At this time, the bonding tape T2 is on the adhering surface, and one half of the width direction is attached to the new web W2, and the remaining bonding surface is exposed on the upper surface.

In the above embodiment, after the new web W2 is adsorbed to the transfer roller 16, the bonding tape T2 is adsorbed to the end edge thereof and transferred to the lower attaching roller 2, so that the bonding tape T2 is attached thereto. Faced, one half of its width is attached to the new web W2, and its The balance of the face is exposed to the upper surface.

Next, after or before the bonding tape T2 is adhered, the bonding tape T1 is adsorbed to the upper side attachment roller 1, and thereafter, the same action is performed, and as shown in FIG. 5F, the old web W1 is made by the roller rotation stopper 19. Stop delivery. Then, the upper and lower attachment rollers 1 and 2 are moved up and down, and the old web W1 is pressed by the two rolls 1, 2, and in this state, the old web W1 is cut by the cutter 6.

When the cutting is completed, as shown in FIG. 5J, the swing piece 22 is swung (rotated) by the air cylinder 21, and the old web W1 is pulled out by the feed roller 23. At this time, since the brake roller 24 is opened, the two attachment rollers 1 and 2 rotate as the old web W1 is pulled out. The web W1 and the new web W2 are also sent out along the rotation (transferred to the right in FIG. 5J), and the rear end of the web W1 is connected to the front end of the new web W2, and the two joint strips T1 and T2 are separated. The wiring is successively applied to the front surface of the new web W2 and the surface of the old web W1, and the new and old webs W1 and W2 are joined/joined by the two joining strips T1 and T2 (Fig. 5J, Fig. 3(c)).

When the joining (stacking) of the new and old webs W1 and W2 is completed, as shown in FIG. 5L, the swinging piece 22 is swung forward (rotated) to be converted into a normal web W sending action.

In the present embodiment, after the conveyance of the old web W1 of FIG. 5F is stopped, the lower attachment roller 2 can be rotated to perform the joining action similarly to the above-described embodiment. The swing piece 22 is not required at this time.

Further, in the present embodiment, the joining action of Fig. 4 can be performed in the same manner, and as described above, the bonding of the joining belts T1, T2 can be performed only for one of the two rolls 1, 2.

In each of the above embodiments, the side of the adsorption surface of each of the rolls 1 and 2 of each of the joint tapes T1, T2, and T3 is followed by the release paper, but if the surface of the opposite surface is followed by the web W1, the joint band is formed. T1, T2, T3 are attached to the web W1 or W2, and the release paper is retained on the sides of the rolls 1 and 2 in an adsorbed state. Therefore, the release paper can be separated from the two rolls 1 and 2 after the web connection is completed. The rolls 1, 2 are appropriately peeled off.

Further, in the above embodiments, the web W is a resin film, but the film is not limited to a resin, and other various films or sheets made of resin may be used. Furthermore, it is not limited to As described above, the film or sheet may be a belt-like web (belt) joining device or method for laminating a single layer or a plurality of layers of paper, cloth, metal foil or the like.

In each of the above embodiments, since the cylinder and the roller rotary actuator are both actuated by the compressed air, the explosion-proof function is provided. However, in an environment where the explosion-proof function is not required, an electric drive mechanism such as a servo motor can be used as the actuator. It waits.

Therefore, it should be understood that all of the embodiments disclosed herein are illustrative and not restrictive. The scope of the invention is to be construed as being limited by the scope of the claims

1‧‧‧Upper attachment roller

2‧‧‧Under the attached roller

a‧‧‧Two-roller crimping point

T1‧‧‧ joint belt

T2‧‧‧ joint belt

W1‧‧‧ omentum (film)

W2‧‧‧ omentum (film)

Claims (12)

A reticulum splicing device, characterized in that it connects a cut end of an old web (W1) conveyed in one direction with a front end of a new web (W2) pulled out from the unwinding device in the above-mentioned direction; a lower side of the transport path of W1), a roll (1, 2) is attached to the upper and lower sides of the old web film (W1), and is disposed in front of the transport path of the upper side attaching roller (1). a cutter (6) of the old web (W1); adsorbing the front end of the new web (W2) to the lower attachment roller (2), and adsorbing the joint tape (T1, T2) to the two rolls (1) 2) at least one of; and the upper and lower attachment rollers (1, 2) are crimped through the old web (W1), and pressed by the cutter (6) on the two rollers (1, 2) The old web (W1) is cut off in the previous stage of the joint (a), and the two rolls (1, 2) are rotated in the above-mentioned conveying direction of the two webs (W1, W2) to make the above-mentioned joint belts (T1, T2) and the old web ( The cut end of W1) and the front end of the new web (W2) are followed by the cut end of the old web (W1) and the front end of the new web (W2). The reticulum splicing device of claim 1, wherein the web connection device adsorbs the bonding tape (T3) to the lower attachment roller (2), and sets the bonding tape (T3) to both sides. Following the double-sided tape of the layer, after cutting the old web (W1), the two rolls (1, 2) are rotated in the conveying direction of the two webs (W1, W2), so that the joint belt (T3) is old. The cut end of the omentum (W1) and the front end of the new web (W2) are followed by the both ends, and the cut end of the old web (W1) is overlapped with the front end of the new web (W2) to be joined. The reticulum splicing device of claim 1, wherein the reticular splicing device adsorbs the bonding tape (T1) to the upper attachment roller (1), and mounts the rotation stop position adjustment weight on the upper attachment roller (1). And (30), when the upper and lower attachment rollers (1, 2) are pressure-bonded by the weight (30), so that the two rollers (1, 2) are along the two webs (W1, W2) Rotating in the conveying direction to connect the jointed belt (T1) to the cut end of the old web (W1) and the front end of the new web (W2) so that the adsorbed joint tape (T1) is located from the crimping point ( a) The point at which the circumferential direction of the roller (1) is offset from the upper side. The omentum splicing device according to any one of claims 1 to 3, wherein the reticular splicing device adsorbs the joining tape (T2, T3) to the lower side attaching roller (2), and the lower side attaching roller (2) In front of the above-mentioned new web transport direction, a transfer roller (16) capable of crimping and retracting the lower attachment roller (2) is provided; on the transfer roller (16), the lower side is attached The front end of the new web (W2) adsorbed between the roller (2) and the transfer roller (16) is adhered to the bonding tape (T2, T3); the transfer roller (16) is attached to the lower side The transfer roller (2) is rotated by the rotation of the lower attachment roller (2) in a state in which the attachment roller (2) is pressed against the new web (W2), and the above-mentioned bonding tape (T2, T3) is attached. The new web (W2) is transferred to the lower attachment roller (2) at the front end. The omentum splicing device according to any one of claims 1 to 4, wherein the crimping surface of at least one of the upper and lower application rollers (1, 2) is formed of an elastic material. The reticulum splicing device according to any one of claims 1 to 5, wherein an adsorption device (13) is disposed in front of the lower attachment roller (2), and the front end of the new retina (W2) is adsorbed to the lower side. When the roller (2) is attached, the adsorption device (13) is adsorbed and held near the front end of the new web (W2). A method for splicing a web, characterized in that it connects a cut end of the old web (W1) conveyed in one direction with a front end of a new web (W2) pulled out from the unwinding device in the above-mentioned direction; The upper side of the transport path of W1) is provided with the upper web (W1) interposed and attached to the upper and lower rollers (1, 2); and the front end of the new web (W2) is adsorbed to the lower side. Roller (2), and the joining tape (T1, T2) is adsorbed to at least one of the two rolls (1, 2), so that the upper and lower applicator rolls (1, 2) are close to each other and are interposed with the old web (W1). Connected, in this state or before the crimping, The old web (W1) in the front stage of the conveying path of the pressure contact point (a) crimped by the two rolls (1, 2) is cut by the cutter (6), and then the two rolls (1, 2) are rotated. The new and old two webs (W1, W2) are transported in the above-mentioned conveying direction, and the joint belts (T1, T2) are connected to the cut ends of the old web (W1) and the new web (W2), thereby continuing the old web. The cut end of (W1) and the front end of the new web (W2). The method of joining the web of claim 7, wherein the bonding tape is a double-sided tape having both sides of the front and back layers, and the bonding tape (T3) is adsorbed to the lower attachment roller (2) to cut the above After the old web (W1), the two rolls (1, 2) are rotated in the above-mentioned conveying direction of the two webs (W1, W2), and the joint belt (T3) is interposed between the cut end of the old web (W1) and the new web. (W2) Between the front ends and the ends, the cut end of the old web (W1) is overlapped and joined with the front end of the new web (W2). The method of joining the web of claim 7, wherein the method of attaching the bonding tape (T1) to the upper attachment roller (1), and attaching the upper and lower attachment rollers (1, 2) to the upper side When the rotation stop position adjusting weight (30) of the roller (1) is pressed, the two rolls (1, 2) are rotated in the conveying direction of the two webs (W1, W2) to form the joining belt (T1). Adhering to the cut end of the old web (W1) and the front end of the new web (W2), the adsorbed bonding tape (T1) is placed on the upper side from the crimping point (a) (1) The point of deviation from the circumference. The omentum joining method according to any one of claims 7 to 9, wherein the new web (W2) is passed through the front side of the new web transporting direction of the lower attaching roller (2), and the lower side can be attached Between the transfer roller (16) to which the roller (2) is pressed and retracted, and the lower attachment roller (2), the transfer film (16) is attached to the lower side via the new web (W2) through which the passage is passed. The roller (2) is crimped, and the front end of the new web (W2) is adsorbed to the transfer roller (16). In this state, the front end of the new web (W2) is applied to the transfer roller (16). The bonding tapes (T2, T3) are attached to each other, and thereafter, the transfer roller (16) is rotated in accordance with the rotation of the lower attachment roller (2), and the bonding tape (T2, T3) is attached. The front end of the new omentum (W2) is transferred to the lower attachment roller (2). The reticulum joining method according to any one of claims 7 to 10, wherein the crimping surface of at least one of the upper and lower applicator rolls (1, 2) is formed of an elastic material; and the upper and lower applicator rolls (1, 2) At the time of crimping, the other roller bites into the roller containing the elastic material. The omentum joining method according to any one of claims 7 to 11, wherein when the front end of the new web (W2) is adsorbed to the lower side attaching roller (2), the lower side attaching roller (2) is provided. The suction device (13) of the previous stage is attracted to hold the vicinity of the front end of the new web (W2).