JPH0737706B2 - Web wrinkle stretcher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wrinkle straightening device for straightening wrinkles generated on a web in a web transport system.

[Prior Art] Conventionally, as a device for stretching wrinkles of a web being conveyed,
As shown in FIGS. 1 to 13, a spiral grooved roll 1, an expander roll 2, a cross guider 3, a nip disc 4, etc. are known.

The spiral grooved roll 1 shown in FIG. 8 has a spiral groove 5 on the surface.
The rubber roll is provided with the spiral groove 5 extending in the opposite direction from the central portion to both ends, and when the roll rotates, the spiral groove exerts a widening force on the web 6 to generate the web 6. It was designed to remove wrinkles.

The expander roll 2 shown in FIG. 9 is configured such that the roll is curved, and a widening force is exerted on the web 6 based on the curved shape so that the wrinkles formed on the web 6 are elongated.

In the cross guider 3 shown in FIGS. 10 and 11, the web 6 is sandwiched by the pair of nip rolls 3A and 3B whose axial lines are tilted at both end portions, and a widening force is applied as the nip rolls rotate.

The nip disc 4 shown in FIG. 12 and FIG. 13 has a pair of nip discs 4A that can rotate the web 6 at both ends.
It is sandwiched by 4B and gives a widening force to the web.

[Problems to be Solved by the Invention] However, in the spiral grooved roll 1 and the expander roll 2, a widening force is exerted on the web 6 by a frictional force generated between the web 6 and the roll 1 or the roll 2. Therefore, the surfaces of the rolls 1 and 2 are usually made of a material such as rubber having a high friction coefficient. However, the rubber or the like is easily scraped off by friction with the web 6, and the rubber powder or the like generated thereby is removed from the web 6 or the like.
May damage the surface. If the web 6 is made of resin, the web 6 is charged with static electricity,
Dust tends to adhere to the.

Further, in the cross guider 3, the contact portion with the web 6 is only the nip points on both sides in the web width direction by the pair of nip rolls, and there is a problem that the amplitude is difficult to reach the center of the web because the widening force is small. Further, the cross guider 3 needs to adjust the widening force of the web 6 by the nip force of the nip rolls 3A and 3B. Therefore, the delicate adjustment of the nip rolls 3A and 3B is required according to the thickness of the web 6, and the adjustment is troublesome. There is also the problem of this. In particular, it is difficult to adjust a thin web. Further, since the web 6 is nipped from both sides, there is a problem that it interferes with the web passing.

On the other hand, the nip disc 4 has the same problem as the cross guider 3 and also has a problem that abrasion powder is generated due to abrasion between the web 6 and the discs 4A and 4B and adheres to the web. Further, since the disks 4A and 4B rotate in a plane substantially parallel to the surface of the web 6, the disks 4A and 4B are
In the contact portion between the web and the web 6, the direction of the force exerted from the disc to the web changes in an arc shape in sequence, which causes an unnecessary disturbance to the running of the web.

An object of the present invention is to solve various problems in the above-mentioned conventional apparatus, so that the web is not damaged even for webs of various materials and thicknesses, and the wrinkle of the web having a large widening force that does not attach dust to the web. It is to provide a stretching device.

Incidentally, in connection with the present invention, JP-A-63-252863 is known as a device capable of controlling the meandering of the web by pressing the web against the roll by utilizing the air suction force. Although the device has the function of correcting the meandering of the web, it has substantially no function of stretching the wrinkles of the web.

[Means for Solving the Problems] A device for stretching wrinkles of a web according to the present invention in accordance with the above object is
Web guide means are provided in the vicinity of both sides of the web in order to elongate wrinkles formed on the web being conveyed,
In a web wrinkle straightening device, (a) the contact surface of the guide means in contact with the web is a cylindrical surface that is driven to rotate by contact friction with the web or a belt surface that is driven to orbit, and (b) the web guide. The driven direction of the cylindrical surface of the means or the belt surface due to the contact friction with the web is set to be inclined with respect to the transport direction of the web by a certain angle in the mutually opening direction. The cylindrical surface or the belt surface of the web guide means is rotatably or rotatably supported, and the surface of the cylindrical surface or the belt surface other than the surface on the web transport side is surrounded, so that the cylinder of the web is substantially Suction port having an opening opening toward the contact surface side to the surface or the belt surface, and (d) Air suction through the suction port, which is connected to the suction port. More, it consists of having at least the by the air flow sucked from between the web guide means and said suction port, and a suction means allowed to adsorb to the contact surface of the web guide means the web of the web.

[Operation] In such an apparatus, the air in the vicinity of the web surface on both sides in the width direction of the web is sucked through the suction port by the suction means, and the web surface is sucked to the contact surface of the web guide means ( Pressure contact). The contact surface to the web is inclined in a divergent shape with respect to the web conveying direction, and the contact surface is movable in the inclined direction, so that the contact surface maintains the web suction state, It moves with the web as it travels. Therefore, both side portions of the web are displaced in the web widening direction as the web runs, and a widening force is applied to the wrinkles.

In this wrinkle stretching action, the frictional force between the web for widening the web and the contact surface of the web guide means is obtained by suction of the web to the web guide means through the suction means and the suction port. Therefore, essentially, a material having a high friction coefficient such as rubber is not required for the contact surface itself of the web guide means. Therefore, the web guide means can be easily made of a material that is less likely to be worn, and damage to the web due to abrasion powder can be prevented. Further, since the contact surface is constituted by a cylindrical surface that is driven to rotate by contact friction with the web or a belt surface that is driven to orbit, the contact surface will rotate or orbit in synchronization with the running speed of the web. The generation of abrasion powder and the like due to the relative speed difference between the two can also be suppressed. Furthermore, even if abrasion powder or dust is generated,
Since air is constantly sucked through the suction port, adhesion to the web is prevented.

Further, since both side portions of the web are attracted to the web guide means and come into surface contact with the contact surface of the means, the web is caught by the web guide means with a sufficiently large force, and a sufficient guide widening force is obtained. . If the contact surface of the web guide means is set to be appropriately long in the inclination direction, both side portions of the web being conveyed can be reliably captured by the web guide means for a certain period of time, and a further widening force can be obtained. .

Further, since the extending direction of the contact surface of the web guide means is a splayed constant inclination direction with respect to the web transport direction, the direction of the force acting from the web guide means to both side portions of the web is also constant, which is sufficient. Stable traveling of the web is ensured while obtaining a widening force.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a web wrinkle straightening device according to an embodiment of the present invention. In the figure, 11 indicates the entire wrinkle straightening device, and the wrinkle straightening device 11 is
It is provided between the guide rolls 12 and 13 on both sides in the width direction of the web 14 being conveyed. Web 14
In this embodiment, after exiting the tenter 15, the guide roll
After passing through 16, 17, and 12, the wrinkles are stretched by the wrinkle stretching device 11, passed through the guide roll 13, and then wound up as a winding roll 18. The web 14 is not particularly limited, and examples thereof include films of thermoplastic resins such as polyethylene terephthalate and polypropylene, paper, cloth, and non-woven fabric.

The wrinkle straightening device 11 has a web guide means 21 and a suction port 22 having an opening that opens toward the lower surface of the web 14 by supporting and surrounding the web guide means 21.
And a suction means 24 which is connected to the suction port 22 through a pipe 23 and sucks air on the lower surface side of the web through the suction port 22. The suction means 24 has a suitable capacity, for example, the suction port 22.
It consists of a blower, a vacuum pump, etc. that can make the inside a negative pressure of about 50 to 500 mmAq.

In this embodiment, the web guide means 21 is composed of a plurality of hollow (five) rolls 26 having a plurality of holes 25 formed in the outer periphery thereof, as shown in FIGS. 2 and 3. The plurality of rolls 26 are arranged in a line in a plane parallel to the web 14 in a direction inclined by a constant angle θ with respect to the transport direction X of the web 14. The inclination angle θ may be a slight angle, but it is preferably set within a range of 5 to 40 degrees depending on the width, thickness, surface condition and the like of the web. It is preferable that θ is in the range of 5 to 40 degrees because the wrinkle elongation effect is enhanced and the rotation speed of the roll 26 is not reduced. This θ
As shown in FIG. 4, the direction is a direction in which the webs are arranged in a divergent manner in the web transport direction. This multiple roll 26
The outer peripheral surface of the above constitutes a contact surface with the movable web 14. The end faces of the rolls 26 in the longitudinal direction are rounded so as not to damage the web 14 when it comes into contact with the web 14. The material of the roll 26 is metal in the present embodiment, but any material can be selected as long as it does not impair the capturing force of the web described later and does not generate abrasion powder.

Each roll 26 is rotatably supported at both ends on the inner surface side of the corresponding suction port 22. That is, each roll 26 rotates due to contact friction with the running web 14, and the roll surface of each roll 26 forms a cylindrical surface that is driven to rotate. The shape of the opening of the suction port 22 is a rectangle having a width W and a length L as shown in FIG. 3, but the shape is not limited to this. In this embodiment, air suction by the suction port 22 is performed between the rolls 26, between the rolls 26 and the suction port as shown in FIG.
It is designed to be performed between the inner surface of 22 and the hole 25, and through the hollow portion of the roll 26. Depending on the mode of the air suction path, the thickness of the web 14, the speed, etc., the suction port 22 So that the load adjustable range in
The size and shape of the suction port 22 and the size of the opening can be appropriately set.

In the embodiment apparatus configured as described above, the web 14
Is sucked on the outer peripheral surface of the roll 26 as the web guide means by the air suction of the vicinity of the lower surface of the web through the suction port 22 by the suction means 24 on both sides in the width direction. At this time, as shown in FIG.
14 is each roll of the roll group constituting the web guide means
It contacts the outer peripheral surface of each roll while being curved in an arc shape along the upper surface of 26. Due to the frictional force due to this contact, the web 14 is captured on the outer peripheral surface of the roll, the rolls 26 are rotated by the running of the web 14, and the position of the web 14 is regulated by the capture, and the web capturing part rotates the rolls 26. In the same direction, that is, in the same direction as the movement of the outer peripheral surface of each roll 26. As shown in FIGS. 3 and 4,
Since the arrangement direction of the rolls 26 (the inclination direction of the web guide means 21) is inclined by θ with respect to the web conveyance direction, the web conveyance force F is applied to both sides of the web 14 by the component force Fx in the web width direction. Occurs, and the web 14 is widened by the component force Fx. This widening force stretches the wrinkles of the web 14.

In this wrinkle stretching, air suction on the lower surface side of the web 14 is performed not only between the rolls 26, between the rolls 26 and the inner surface of the suction port 22, but also through a large number of holes 25 and hollow portions of the rolls 26. Therefore, the web 14 is attracted onto each roll 26 with a sufficient suction force. Then, as shown in FIG. 2, on each roll 26, the web 14 is contacted and adsorbed so as to wind around the outer peripheral surface of each roll 26 in an arc shape, so that a sufficiently large frictional force is obtained, Sufficient widening force can be obtained. That is, since the web 14 is captured with a large contact area by the plurality of rolls 26, unlike the conventional device that makes point or line contact with the web, the web 14 is reliably captured for a certain period of time, and a sufficient widening force is obtained. To be

The suction force of the suction means 24 may be adjusted by controlling the blower output, or by a valve or a throttle in the middle of piping. The width W and the length L of the opening of the suction port 22 are set to W of 30 to 150 mm and L of 50 to 250 mm, depending on the conditions such as the width, thickness and running speed of the web 14. The range is preferable in order to obtain a strong suction force.

When the web 14 is a plastic film, there are about 2 to 10% of edge portions that are not trimmed after trimming at both ends of the sheet, so it does not matter if there are abrasion scratches on the web surface. . Web 14 within the width of its edge
Is preferably captured by the guide means 21.

It is of course desirable that S in FIG. 3 be as small as possible, but it is necessary that the guide means 21 protrude outside the end of the web 14 and make a portion that does not contact the web. This is not preferable because air flows in through the air and reduces the force of capturing the web.

Further, as shown in FIG. 2, it is preferable that the suction port 22 does not come into direct contact with the web 14.

By the way, when the wrinkle-extending effect of a polyester film having a thickness of 10 μm was evaluated by using the above-mentioned apparatus,
The results shown in FIG. 5 were obtained. The diameter of the roll 26 is 24 mm,
The film transport speed was 100 to 200 m / min. As shown in FIG. 5, by setting the inclination angle θ of the web guide means (roll rotation axis inclination angle) within an appropriate range according to the width of the web, a large wrinkle-extending effect can be obtained.

The relationship between the web width and the inclination angle θ can be changed depending on the conditions such as the web material, the web thickness, and the transport speed.
It is not limited to this embodiment.

Next, other embodiments are shown in FIGS. 6 and 7, respectively.

FIG. 6 shows a rotatable roll as a web guide means.
31 shows a shape according to another embodiment of 31. A plurality of annular grooves 32 are engraved on the outer circumference of the roll 31. The material of the roll 31 may be any of metal, resin, rubber and the like. By arranging such rolls 31 with a plurality of predetermined inclination angles on both sides of the web in the same manner as the apparatus of the embodiment shown in FIGS. 1 to 4, the same action and effect as the above-mentioned embodiment can be obtained. To be

In the apparatus shown in FIG. 7, the perforated endless belt 42 is looped between the rolls 41a and 41b equivalent to the roll 26 shown in FIG. 1 and FIG.
It is designed to be driven by the contact friction with 14. The grooved roll 31 shown in FIG. 6 may be used as the rolls 41a and 41b.
Instead of 42, mesh (eg wire mesh) belt means may be used. Further, using a grooved roll equivalent to the roll 31 shown in FIG. 6, a rubber ring (not shown) is placed between the corresponding grooves of the front and rear rolls to suck air between the orbiting rubber rings. The gap may be formed in advance. By rotating such a belt means, the same operation and effect as those of the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the web wrinkle stretching device of the present invention, the following various effects can be obtained.

Since the web can be captured with a large force with a sufficient contact area, the web can be reliably captured for a certain period of time, a sufficient widening force can be obtained, and wrinkles can be reliably extended.

Since the contact with the web is made in the vicinity of both sides of the web, the surface of the web is not damaged, and the contact surface with the web is driven to rotate or orbit, so that the running speed of the web and the moving speed of the contact surface are Since they are substantially naturally synchronized, static electricity due to friction is not generated, so that it is difficult for dust to adhere to the web, and wrinkles can be extended without causing uneven charging.

Further, the direction of the web widening force is constant from the widening start end to the end, so that unnecessary disturbance is not given to the web conveyance, and the stable running state of the web can be obtained while extending the wrinkles.

Further, since the web is attracted by the suction method to the web guide means, even if abrasion powder is generated due to frictional contact with the web, the abrasion powder can be removed by suction from the opening of the suction port, and the adhesion to the web can be prevented. Prevent and scratch the web,
It is possible to prevent the occurrence of quality defects such as foreign matter mixing.

Further, since the web is caught by the web guide means on one surface side thereof, there is no obstacle when passing the web, and good handling property can be secured.

The wrinkle straightening device of the present invention may be provided in plural on both sides in the width direction of the web. For example, if two or more pairs of web guide means are provided in the web flow direction, the wrinkle of the web is stretched in two or more stages. As a result, it is possible to obtain a larger wrinkle-extending effect.

[Brief description of drawings]

1 is a perspective view of a wrinkle straightening device for a web according to an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of a web guide means and a suction port of the device of FIG. 1, and FIG. 3 is FIG. FIG. 4 is a partial plan view of the apparatus of FIG. 1, FIG. 5 is a characteristic view showing a wrinkle-extending effect in a test using the apparatus of FIG. 1, and FIG. 6 is another embodiment. FIG. 7 is a front view of a roll as a web guide means of a wrinkle stretching device for a web according to FIG. 7, FIG. 7 is a longitudinal sectional view of a web guide means and a suction port of a wrinkle stretching device for a web according to still another embodiment, and FIG. 9 is a plan view of a conventional expander roll, FIG. 10 is a plan view of a conventional cross guider, FIG. 11 is a front view of the apparatus of FIG. 10, and FIG. Is a plan view of a conventional nip disc, and FIG. 13 is a front view of the device shown in FIG. It 11 …… Wrinkle straightening device 12,13,16,17 …… Guide roll 14 …… Web 21 …… Web guide means 22 …… Suction port 23 …… Piping 24 …… Suction means 25 …… Hole 26 …… Roll 31 ...... Grooved roll 32 …… Groove 41a, 41b …… Roll 42 …… Perforated belt θ …… Inclination angle

Continuation of the front page (56) Bibliographic references Sho 59-157495 (JP, U) JP 51-19065 (JP, B2) JP 51-15155 (JP, B2)

Claims (2)

[Claims] 1. A web wrinkle straightening device, wherein web guide means are provided in the vicinity of both sides of the web for straightening wrinkles formed on the web being conveyed. (A) The guide means is provided on the web. The contact surface which is in contact is a cylindrical surface which is driven to rotate by contact friction with the web or a belt surface which is rotated around the driven surface, and (b) a direction in which the cylindrical surface of the web guide means or the belt surface is driven by contact friction with the web. Is set so as to be inclined at a constant angle in the mutually opening direction with respect to the conveying direction of the web, and (c) the cylindrical surface or the belt surface of the web guide means is rotatably or rotatably supported, Also, by enclosing a surface other than the surface on the web transport side of the cylindrical surface or the belt surface, substantially the cylindrical surface or the belt surface of the web is formed. A suction port having an opening that opens toward the contact surface side, and (d) is sucked from at least between the web guide means and the suction port by air suction through the suction port. A wrinkle-stretching device for a web, comprising: suction means for attracting the web to the contact surface of the web guide means by an air flow. 2. The web wrinkle straightening device according to claim 1, wherein the constant angle is in the range of 5 to 40 degrees.