JPH10183458A - Relaxation of base cloth for artificial leather and relaxation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relaxation process and a relaxation machine for the base cloth of artificial leather that can increase the relaxation effect by bringing about shape change effective for the base cloth of artificial leather and enable continuous relaxation treatment. SOLUTION: The base cloth for artificial leather 1 is sent into the paths 3A and 3B to the bathing tanks 2A and 3A, as it is loosened, then, the base cloth sent in the tanks is pulled and taken out in the air, and the pulled-up bath cloth 1 is allowed to fall down in the paths of the individual bathing tank. A series of these operations are repeated to occur the repetition of loosening and elongation in the base cloth whereby the relaxation effect of the base cloth 1 is increased and continuous relaxation treatment becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for relaxing an artificial leather base cloth which continuously performs a relaxation treatment while conveying a non-woven fabric impregnated with polyurethane.

[0002]

2. Description of the Related Art Artificial leather is roughly classified into two types, artificial leather with silver and suede-like artificial leather. As a base fabric for these artificial leathers, a nonwoven fabric obtained by impregnating a non-woven fabric with a polyurethane resin is generally used. Can be When processing the base fabric for artificial leather, the base fabric is distorted due to various external forces such as tension and pressure, so a relaxation treatment for removing the distortion is required, and various treatment methods have been conventionally known. I have.

In order to increase the productivity of the above-mentioned relaxing treatment, there is also known a method in which a base fabric is conveyed and passed through a heating liquid in a liquid tank to continuously perform a massage relaxing treatment. For example, the continuous relaxing apparatus for fabric disclosed in Japanese Patent Publication No. 47-23697 is to reverse a rotor in a liquid tank alternately in a forward / reverse direction, thereby giving a strong fir action to the fabric and relaxing the fabric.

Further, in the method of treating a sheet-like material disclosed in Japanese Patent Application Laid-Open No. Hei 7-268664, the sheet-like material is fed into an upstream portion of a processing liquid tank and temporarily stays in the tank. The sheet is transferred to the downstream portion of the tank via the transfer path, and temporarily stays there, and a pair of water jet nozzles having a function of jetting in the forward direction and the reverse direction arranged in the transfer path during the transfer are alternately operated to thereby transfer the sheet. The article is repeatedly transported between an upstream portion and a downstream portion of the processing liquid tank, and then is transported outside the tank at a speed equal to or lower than the above-described feeding speed.

In both of the above-mentioned conventional methods, the above-mentioned base cloth is used in the form of a rope, and the rope-shaped base cloth is bent back and forth in the transport direction to cause a morphological change due to lateral wrinkles, and the paper is repeatedly transported. It is intended to exert a relaxing effect by moving the wrinkle portion without fixing it.

[0006]

However, in the above-mentioned prior art, there is a problem that the morphological change due to only vertical wrinkles is not sufficient, and the morphological change due to vertical wrinkles is not sufficient, and the relaxing effect is not sufficiently exhibited. In other words,
The invention of No. 697 kneads the base cloth by inverting with the rotor,
Because it is only processing in the liquid tank, the base cloth does not spread as it is in the form of a rope, and the portion of the rope-shaped vertical wrinkle does not change,
In the artificial leather base fabric, vertical wrinkles remain and cannot be applied.

In the invention disclosed in Japanese Patent Application Laid-Open No. Hei 7-268864, the base fabric is repeatedly transported, and the base fabric is put out into the air by a water jet. Can not be raised high. On the other hand, if the power of the water jet is increased, the base cloth can be raised, but extra tension is applied to the base cloth once relaxed in the liquid tank. In addition, it is necessary to narrow the inside of the passage of the liquid tank, and there is a problem that the base cloth may be damaged on the inner wall of the passage.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a method for relaxing an artificial leather base cloth which enables an effective form change in the base cloth to improve the relaxation effect and enables continuous relaxation processing. And devices.

[0009]

According to one aspect of the present invention, there is provided a method and apparatus for relaxing a base fabric for artificial leather according to the present invention, wherein a nonwoven fabric is impregnated with polyurethane. A treatment liquid is stored and disposed above at least one bath tub having a substantially U-shaped passage when viewed from a side perpendicular to the direction in which the base cloth is conveyed in order to continuously perform the relaxation treatment while conveying the cloth. By the roller device, the base cloth is slackened and sent into the passage in the bathtub, and then the pulled-in base cloth is pulled up into the air while being pulled, and further, the pulled-up base cloth is dropped into the passage in the bathtub. Repeat the process. According to the above configuration,
By sagging the base fabric and sending it into the bathtub passage, pulling the sent base fabric up in the air while pulling, and repeating a series of steps of dropping the raised base fabric into the bathtub passageway Since the sagging and elongation are repeatedly generated in the base fabric, the relaxing effect of the base fabric is improved, and the continuous relaxing process becomes possible.

That is, in order to effectively exert the relaxing effect of the artificial leather base fabric, it is preferable to cause not only a morphological change due to horizontal wrinkles but also a morphological change due to rope-shaped vertical wrinkles. Since the polyurethane contained in the base cloth for artificial leather has a high rebound resilience, the base cloth spreads by raising the base cloth to an air height such that vertical wrinkles extend from the bath tub, so that when it is sent again to the bath tub. The part of the rope-shaped vertical wrinkles changes. The horizontal wrinkles are formed by bending the rope-shaped base fabric back and forth in the transport direction and transporting it repeatedly.
The part changes. When this series of operations is repeated, the relaxation effect is improved by the morphological change due to the horizontal wrinkles and the vertical wrinkles.

Preferably, before the base cloth is fed into the bathtub, the base cloth is reciprocated in a horizontal direction perpendicular to the transport direction, so that the base cloth is folded in the transport direction of the base cloth. Stack in the direction and guide it into the passage of the bathtub. Therefore, it is possible to prevent the rope-shaped base fabric from being entangled and to reduce the stacking height in the bathtub to reduce the size of the apparatus.

Preferably, the relaxer for artificial leather base cloth is arranged in series in the transport direction of the base cloth, stores the processing liquid, and is substantially U-shaped when viewed from a side perpendicular to the transport direction of the base cloth. A first and a second tub having a V-shaped passage, a carry-in roller disposed above each of the tubs for feeding the fabric to the first tub, and a carry-out roller for drawing the fabric from the second tub; A roller device having a reversing roller mechanism for performing a forward rotation of pulling out the cloth from the first bathtub and sending it to the second bathtub, and a reverse rotation of pulling out the base cloth from the second bathtub and sending it to the first bathtub; The first bath tub and the state of storage of the base cloth in the first bath tub are detected, and the rotation of the roller device is controlled to pull out the base cloth from the second bath tub and to send the base cloth to the first bath tub with slack. Operation and pulling out the base cloth from the first bathtub And a control means for slack to the bathtub is repeated a second operation to feed in. According to the above configuration, the first operation of pulling out the base cloth from the second bath tub and slackly sending it to the first bath tub, and pulling out the base cloth from the first bath tub and slackly sending it to the second bath tub. By repeating the second operation, sagging and elongation are repeatedly generated in the base cloth, so that the relaxing effect can be improved and continuous relaxation processing can be performed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a relaxing device for a base cloth for artificial leather according to an embodiment of the present invention. This apparatus continuously relaxes a base fabric for artificial leather in which a non-woven fabric is impregnated with polyurethane while transporting the base fabric. The artificial leather base fabric referred to in the present invention includes all the non-woven fabrics after the polyurethane is impregnated, the surface may be fluffed, or the surface may be coated with a resin for a silver surface layer. Also includes those that have been applied.

First, a pair of draw-in rollers 21 driven by a driving device (not shown) to draw in the base fabric 1 sent from the preceding process are moved upstream and down to make the tension of the base fabric 1 constant. The dancer roller 23 and the impregnation tank 22 are arranged. The impregnation tank 22 includes a plurality of upper rollers 22a, a lower roller 22b, and a steam heater 22c that heats the pipe by passing steam.
The processing liquid R heated by the steam heater 22c is stored to such an extent that the lower roller 22b is immersed. The base cloth 1 has, for example, a width of 1500 mm. The base cloth 1 is alternately dipped and squeezed by alternately passing the treatment liquid R and the space between the upper roller 22a and the lower roller 22b a plurality of times to moisten the cloth. State.

On the downstream side, an inclined table 24 is provided via a pair of pull-in rollers 25 and a first lifting roller 27. These rollers 25 and 27 are drive rollers connected to a drive (not shown). The inclined table 24 is for pooling the base cloth 1 and includes the first lifting roller 27.
The base cloth 1 which is lifted and dropped by the above is conveyed along the slope without giving any tension. This inclined table 24
Sends the falling base cloth 1 one after another along this inclination, so that the preceding base cloth 1 is on the succeeding lower side, and the base cloth 1 is prevented from being entangled.

A traverse mechanism 2 is provided above the lower end of the inclined table 24.
6, and a carry-in roller 12 described later is disposed above the work 6. Downstream of the carry-in roller 12, approximately in the center of the apparatus, two
Two first and second bathtubs 2A, 2B are arranged. These first and second bathtubs 2A and 2B store the processing liquid R and have substantially U-shaped passages 3A and 3B when viewed from the side orthogonal to the transport direction G1 of the base cloth 1. .

The traverse mechanism 26 has a base cloth width 150
It has a ring 29 with a hole diameter sufficiently smaller than 0 mm, and the base fabric 1 having a width of 1500 mm is squeezed into a rope shape by passing through the ring 29. The traverse mechanism 26 moves the rope 29 in the lateral direction (the direction orthogonal to the plane of FIG. 1) perpendicular to the transport direction G1, thereby moving the rope-shaped base cloth 1 passing therethrough in the lateral direction. . As shown in FIG. 2 (front view), the base cloth 1 is reciprocated in the horizontal direction H perpendicular to the conveyance direction by the lateral movement of the ring 29, and is moved in the conveyance direction of the base cloth 1 via the carry-in roller 12. While being folded and stacked in the horizontal direction H, it is guided into the passage 3A of the first bathtub 2A. In other words, the base cloth 1 is evenly stacked in the lateral direction H of the passage 3A of the first bathtub 2A to prevent the base cloth 1 from being entangled, and the stacking height in each of the bathtubs 2A and 2B is reduced to reduce the size of the apparatus. I do.

A plurality of steam heaters 6 are provided in the vicinity of the passages 3A and 3B in each of the bathtubs 2A and 2B to keep the processing liquid R in the bath at a constant temperature (for example, 50 to 98 ° C., preferably 80 to 98 ° C.). (° C). In addition, each passage 3A, 3B
Hot water showers 7 and 7 are arranged opposite to each other at the upper end of the base cloth 1, and the heated treatment liquid R is sprayed from the front and rear onto the outer peripheral surface of the rope-shaped base cloth 1 by the hot water showers 7 and 7. Enhances the tangling prevention effect. Furthermore, bathtub 2A, 2
A glass viewing window 8 facing each of the passages 3A and 3B is provided on the side wall of B, and the entanglement of the base cloth 1 in the passages 3A and 3B is monitored by looking through the glass viewing window 8.

The roller device 10 includes a carry-in roller 12, a carry-out roller 14, and a reversing roller mechanism 16. The carry-in roller 12 is arranged above the entrance side of the passage 3A of the first bathtub 2A, and slacks the base fabric 1 into the passage 3A of the first bathtub 2A by the rotation of the drive roller 12a. Thereby, the base fabric 1 is also folded back and forth in the transport direction G1 as shown in FIG. That is, the base fabric 1 is moved in the transport direction G1.
And the traverse mechanism 2
6, the sheets are evenly stacked in the horizontal direction H. The carry-out roller 14 is disposed above the outlet side of the passage 3B of the second bathtub 2B, and pulls the base fabric 1 from the second bathtub 2B to the air while pulling the base fabric 1 from the second bathtub 2B by the rotation of the drive roller 14a.

The reversing roller mechanism 16 is disposed at a predetermined height above the exit side of the passage 3 of the first bathtub 2A and the entrance side of the passageway 3 of the second bathtub 2B.
6b and a free roller 3 interposed therebetween.
And two intermediate rollers 16c. The reversing roller mechanism 16 pulls the base fabric 1 in the transport direction G1 from the first bathtub 2A to the air while pulling it up into the air and feeds it to the second bathtub 2B, and rotates the base fabric 1 in the direction G2 opposite to the transport direction G1. 2
The reverse rotation of pulling up from the bathtub 2B to the air while pulling it and sending it to the first bathtub 2A is performed. The height of the reversing roller mechanism 16 is such that the rope-shaped base cloth 1 in each of the bathtubs 2A and 2B is pulled up, and the rope-shaped base cloth 1 is positioned in the air.
It is set to the extent that it naturally spreads due to its own rebound resilience.

The reversing roller mechanism 16 drives the downstream roller 16b as a driving roller and the upstream roller 16a as a free roller when the reversing roller mechanism 16 rotates in the forward direction to convey the base cloth 1 in the conveying direction G1. When the base cloth 1 is transported in the reverse direction G2 with respect to the transport direction G1, the roller 16a on the upstream side is driven as a driving roller, and the roller 16b on the downstream side is driven as a free roller.

The upper portions of the bathtubs 2A and 2B are covered by a casing C, in which the carry-in roller 12, the carry-out roller 14, the reversing roller mechanism 16, and the traverse mechanism 26 of the roller device 10 are housed. .
Steam generated from each of the bathtubs 2A and 2B is discharged from a steam discharge port 41 provided at an upper portion of the casing C by a fan (not shown).

A water-cooled shower room 3 is provided downstream of the bathtub 2B.
0 is provided, and the bathtub 2 is
The base fabric 1 carried out from B falls naturally and is sent to the water-cooled shower room 30. The water-cooled shower room 30 includes a transport conveyor 31 disposed at a lower portion thereof, and a water-cooled shower 32 and a centering device 33 disposed above the transport conveyor 31.

The transport conveyor 31 is used for the base cloth 1 that has fallen.
And is conveyed without tension. The water-cooled shower 32 lowers the temperature of the base fabric 1 by bathing cold water during the transfer of the base fabric 1. This allows
The base fabric 1 is hardly stretched, and can cope with tension generated in a later step. The centering device 33 conveys the base cloth 1, which is lifted from above the conveyor 31 by a pair of pull-up rollers 34 as drive rollers and spread from the rope state by downstream devices 38 and 40, with its center line being conveyed. Perform centering so that it is almost at the center of the orbit.

On the downstream side of the pulling roller 34, a dancer roller 35 for keeping the tension of the pulled up base cloth 1 constant.
A guide roller 37 is provided on the downstream side, and is located diagonally above the rollers 34, 35, and 37 to detect the twist of the base cloth 1 and correct the twist according to the twist state. A well-known torsion correcting device 36 and a second lifting roller 38 as a driving roller are provided.
Below that, a texter 40 is arranged. The texter 40 is a well-known device that expands the width of the base cloth 1 that naturally falls from the second lifting roller 38.
The base cloth 1 is pulled outward by a pair of threaded expander rolls 40a provided on both sides of the base cloth 1 and spread. Thereafter, the base cloth 1 whose width has been expanded is carried out to the next drying step by a pair of draw-out rollers 39.

The control means 15 includes all the driving rollers, ie, the drawing rollers 21 and 25, the first lifting roller 27,
The carry-in roller 12a, the carry-out roller 14a, the roller 16a,
16b, pulling roller 34 and second lifting roller 38
And the torsion correcting device 36. The control means 15 first controls the rotation of the roller device 10, pulls out the base cloth 1 from the passage 3B of the second bathtub 2B, sags the base cloth 1 into the passage 3A of the first bathtub 2A, and moves the cloth 1 in the transport direction. A first operation of feeding in a folded state before and after
The base cloth 1 sent into the passage 3A of the first bathtub 2A is lifted into the air, and the raised base cloth 1 is further transferred to the second bathtub 2A.
The second operation in which the sheet is fed into the path 3B of B in a state of being folded back and forth in the transport direction while being slackened is repeated. In the second operation, the rotation timing in the transport direction and the reverse direction is controlled.

The control means 15 further includes pull-in rollers 21 and 25, a first lifting roller 27, and a loading roller 12
The drive roller 12a and the drive roller 14a of the carry-out roller 14 are driven to rotate at a relatively slow first speed V1, and the rollers 16a and 16b of the reversing roller mechanism 16 are rotated at a second speed V2 higher than the first speed. .

In this case, the storage state of the base fabric 1 inside the passage 3A of the first bathtub 2A and the passage 3B of the second bathtub 2B is as follows.
It is detected by sensors T (for example, three T1 to T3) such as optical sensors or ultrasonic sensors arranged along the horizontal direction H in FIG. That is, it is detected whether or not the stacked base cloths 1 are present at each location in the passages 3A and 3B by the sensors T1 to T3, and according to the number of sensors T1 to T3 that have detected the presence of the base cloths 1, The degree of storage of the base fabric 1 in each of the bathtubs 2A and 2B at that time is detected, and the first
When the storage in the bathtub 2A is small and the storage in the second bathtub 2B is large, the first operation is started, and vice versa, the second operation is started.

Next, the operation of the present apparatus will be described. In FIG. 1, for example, a dried base fabric 1 having a width of 1500 mm is first carried into an impregnation tank 22, and is alternately dipped and squeezed between the treatment liquid R and a plurality of rollers 22a and 22b to be in a wet state. . Next, it falls on the inclined table 24 through the pull-in roller 25 and the first lifting roller 27.

The base cloth 1 is pooled on the inclined table 24 without tension, and is pulled up by the ring 29 of the traverse mechanism 26 while being pulled up by the carry-in roller 12. At this time, the traverse mechanism 26 is moved in the horizontal direction H (FIG. 2), and is stacked in the horizontal direction H while being folded in the transport direction in the passage 3 of the bathtub 2A.

Next, the control means 15 controls the rotation speed of each roller device 10 according to the storage state of the base cloth 1 inside the passages 3A and 3b of each bathtub, and the first operation and the second operation are performed. Are repeated, and the base cloth 1 is subjected to the relaxation processing. FIG. 3 shows an example of the above repetitive operation.

[At the time of line start] First, as shown in FIG. 3 (a), each of the passages 3A and 3B is divided into an upstream part and a downstream part with respect to the center lines C1 and C2 in the conveying direction G1. Of the first bathtub 2A by the preliminary operation of
And the downstream part of the passage 3B of the second bathtub 2B,
The base fabric 1 is fed in a slack manner, and stays in a fixed amount in a state where the base fabric 1 is folded in the front-rear direction in the transport direction G1. In the present apparatus, the staying amount is always ensured even during the repetitive operation so that the tension is not applied to the base fabric 1 as much as possible. In the upstream part of the passage 3B of the second bathtub 2B, a certain amount of the base fabric 1 in a folded state to be repeated is retained.

In this state, the carry-in roller 12 and the carry-out roller 14 rotate at the first speed V1 in the carrying direction G1.
The reversing roller mechanism 16 rotates in a direction G2 opposite to the transport direction G1 at a second speed V2 higher than the first speed V1. Generally, the second operation time t2 for rotating the roller 16b in the forward direction is longer than the first operation time t1 for rotating the roller 16a of the reversing roller mechanism 16 in the reverse direction (t1 <t2).

[After t1 hour from start] After t1 hour, of the base cloth 1 retained in the upstream portion in the passage 3B of the second bathtub 2B in FIG. After the base cloth 1 is conveyed in the reverse direction G2 with respect to the conveyance direction G1 by the reverse rotation of the roller 16a of the reversing roller mechanism 16, the base cloth 1 is lifted into the air from the inside of the passage 3B of the second bathtub 2B. Thus, it falls naturally into the passage 3A of the first bathtub 2A. As a result, the base fabric 1 is once stretched, then sagged again and sent into the first bathtub 2A in a state of being folded back and forth in the transport direction G1. On the other hand, the new base cloth 1 is transferred by the carry-in roller 12 to the passage 3A of the first bathtub 2A.
Is transported by the length of V1 × t1. On the other hand, the unloading roller 14 unloads the relaxed base fabric 1 having the length of V1 × t1 from the downstream portion in the passage 3B of the second bathtub 2B. Thus, the first operation is performed.

[T1 + t2 hours after start] FIG. 3 (c) shows a state after t1 + t2 hours from the start, that is, a further t2 time after the state of FIG. 3 (b). First,
In FIG. 3B, after the time t1 from the start, the rotation direction and the rotation speed of the carry-in roller 12 and the carry-out roller 14 are not changed, and the roller 16b of the reversing roller mechanism 16 is moved.
The rotation direction is changed without changing the rotation speed, and the respective rotations are made forward in the transport direction G1. Therefore, after t2 hours from this state, the base cloth 1 having a length of V2 × t2 is conveyed in the conveying direction G1 and is lifted into the air from the downstream portion of the passage 3A of the first bathtub 2A. Here, the first operation time t1 <the second operation time
Since the operation time is t2, the amount sent to the first bathtub 2A within the time t1 + t2 is sent to the second bathtub 2B. Further, the base cloth 1 having a length of V2 × t2 pulled up.
Is naturally dropped into the passage 3B of the second bathtub 2B as shown in FIG. 3 (c). As a result, the base fabric 1 is once stretched, then sags again and fed in a state of being folded back and forth in the transport direction G1. Similarly, after a time t2 from the time t1, a new base cloth 1 is similarly carried in by the carry-in roller 12 into the passage 3A of the first bathtub 2A by the length of V1 × t2. The relaxed base cloth 1 having a length of V1 × t2 is provided in the second bath 2
B is carried out from the downstream portion in the passage 3B. Thus the second
Is performed. As a result, t1 + t2 from the start
After a certain time, the state shown in FIG. 3C is reached, the state returns to the line start state shown in FIG. 3A, and this repetitive operation is repeated.

Thereafter, the base fabric 1 carried out from the carry-out roller 14 is carried into a water-cooled shower room 30 and is cooled by a water-cooled shower 32 while being carried on the carrying conveyor 31. At this time, the base cloth 1 is in a state of being spread from the rope state in the lateral direction. The base fabric 1 spread in the lateral direction is
The centering is performed by the centering device 33, and the tension is fixed by the dancer roller 35, and the torsion is corrected by the torsion correcting device 36. Next, the horizontal width is widened by the texter 40 and carried out to the drying step.

As described above, the present apparatus performs a continuous relaxation treatment, and since the polyurethane contained in the base cloth for artificial leather has a high rebound resilience, the rope-shaped base cloth 1 can be used for each of the apparatus. By inverting between the bathtubs 2A and 2B and repeating the repetitive operation of spreading the base fabric 1 sufficiently in the air a certain number of times, not only the horizontal wrinkles but also the rope-like vertical wrinkles are moved. Since an effective form change is caused in the base fabric 1, the relaxing effect can be improved.

[0038]

Example 1 A mixed spun fiber composed of 50 parts of an island component made of polyamide and 50 parts of a sea component made of polyethylene was drawn in hot water at 56 ° C., mechanically crimped, cut into 51 mm raw cotton, and unwound with a card. The web is made with a cross wrapper, and the punch density is 1200 with a 1 barb needle.
Needle punching was performed at a punch / cm ² to produce a three-dimensional entangled nonwoven fabric. The obtained nonwoven fabric has a weight of 700 g / m.
^{2. The} apparent density was 0.20 g / cm ² . This nonwoven fabric is immersed in hot water of 80 ° C. for 2 minutes, shrunk by 40% in area, dried by a hot air dryer of 100 ° C., and further heated and pressed on a hot drum having a surface temperature of 145 ° C. with a metal net. Thus, an entangled nonwoven fabric having a smooth surface and an apparent density of 0.29 g / cm ² was obtained. This nonwoven fabric is impregnated with a dimethylformamide solution of a polyether-based polyurethane, the polyurethane is coagulated in an aqueous solvent, and the sea component is removed in hot toluene (dimensional change during removal of the sea component, longitudinal +15).
%, -8% in the horizontal direction) and then dried to a thickness of 1.33 m
m, a weight of 458 g / m ² and a density of 0.344 g / cm ² were obtained. This base cloth is relaxed by the relaxation device shown in FIG.
The relaxation process was continuously performed under the following processing conditions. (Treatment conditions) Base cloth transport speed V1 10 m / min Temperature of bathtubs 2A and 2B 93 ° C. Inverted base cloth amount in bathtubs 2A and 2B 300 m Reverse speed V2 100 m / min Number of times of reversal 10 times / 30 minutes 1.38mm thickness, 508g / m weight
^2. A soft base cloth having a density of 0.368 g / cm ² was obtained.

[0039]

According to the present invention, the base cloth is slackened and sent into the passage of the bathtub, and then the pulled base cloth is pulled up into the air while being pulled, and the pulled-up base cloth is dropped into the passage of the bathtub. By repeating the series of steps to make the base fabric sag and stretch repeatedly, the relaxing effect of the base fabric can be improved, and continuous relaxation processing can be performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a relaxing device for a base cloth for artificial leather according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a traverse operation.

FIGS. 3A to 3C are side views showing a repetitive operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base cloth, 2A ... 1st tub, 2B ... 2nd tub, 3A
... passage of the first bathtub, 3B ... passage of the second bathtub, 10 ...
Roller device, 12: carry-in roller, 14: carry-out roller, 1
5: control means, 16: reversing roller mechanism, 26: traverse mechanism, G1: transport direction, H: lateral direction, R: treatment liquid.

Continued on the front page (72) Noriaki Hayashikoshi 1621 Sakurazu, Kurashiki-shi, Okayama Prefecture Kuraray Co., Ltd. (72) Inventor Kazuyuki Iwano 2-28 Kurashiki-cho, Nakajo-cho, Kitakanbara-gun, Niigata Kuraray Co., Ltd. 72) Inventor Shoichi Hirai 1621 Sakurazu, Kurashiki City, Okayama Prefecture Inside Kuraray Co., Ltd. (72) Inventor Takeo Takagi 4-10-26 Higashiyakura, Kusatsu City, Shiga Prefecture

Claims (5)

[Claims] 1. A method of relaxing an artificial leather base fabric in which a nonwoven fabric is impregnated with polyurethane and continuously relaxing while conveying a base fabric for artificial leather, wherein a treatment liquid is stored and the base fabric is conveyed. The base fabric is slacked and fed into the bathtub passage by a roller device disposed above at least one bathtub having a substantially U-shaped passage when viewed from the side orthogonal to the direction. A method for relaxing an artificial leather base cloth, comprising repeating a series of steps of pulling the base cloth into the air while pulling the base cloth and dropping the raised base cloth into a passage in a bathtub. 2. The bathtub according to claim 1, further comprising: reciprocating the base fabric in a transverse direction perpendicular to the transport direction before the base fabric is sent into the bathtub. A method for relaxing an artificial leather base cloth, wherein the base cloth is stacked in the horizontal direction while being guided in the direction of transport of the base cloth. 3. A relaxing apparatus for artificial leather base cloth for continuously performing a relaxation treatment while conveying a base cloth for artificial leather in which a non-woven fabric is impregnated with polyurethane, wherein a treatment liquid is stored and the base cloth is transferred. At least one bath tub having a substantially U-shaped passage as viewed from the side orthogonal to the direction, a roller device disposed above the bath tub, and controlling the rotation of the roller device to sag the base fabric. Control means for sending a series of steps of pulling the sent base cloth up into the air while pulling it, and dropping the raised base cloth into the bathtub path. Characterized as a relaxing device for base cloth for artificial leather. 4. The method according to claim 3, further comprising: reciprocating the base cloth in a transverse direction perpendicular to the transport direction before the base cloth is sent into the bathtub. A relaxer for artificial leather base fabric, comprising a traverse mechanism for guiding the inside of a bath tub so as to be stacked in a lateral direction while being folded in a transport direction. 5. The apparatus according to claim 3, wherein a first bath and a second bath are arranged in series in a direction in which the base cloth is transported, and the roller device includes a carry-in roller for feeding the base cloth into the first bath, and a second roller. An unloading roller that pulls out the base cloth from the bathtub,
A reversing roller mechanism for performing a forward rotation of pulling out the base cloth from the first bathtub and sending it to the second bathtub, and a reverse rotation of pulling out the base cloth from the second bathtub and sending it to the first bathtub; The control means detects the state of storage of the base fabric in the first bathtub and the second bathtub, controls the rotation of the roller device, draws the base fabric out of the second bathtub, and sags the first bathtub. And a second operation of pulling out the base cloth from the first bathtub and slacking it into the second bathtub and sending the same to the second bathtub.