JP3134080B2 - Method for producing a compacted web - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simplified method for producing a compressed web, and more particularly, to controlling the density by over-feeding the web with a mechanism for gripping at least both ears of the web. The present invention relates to a method for producing a contracted web by shrinking or heat-treating the web.

[0002]

2. Description of the Related Art Shrink heat treatment of a web with a tenter device (grip tenter, pin tenter) is a method generally performed in the industry, but the device is large, the device cost is high, and a large floor space is required. Not only that, but there is no particularly simple means for shrinking in the vertical direction. Also, a method in which the web is placed on a place where the surface is extended on a turn roll of a thick rubber roll, and only the vertical direction of the web is reduced (USP 2,624,245, etc.)
There is also. However, the method using this thick rubber has drawbacks in that the length of shrinkage is small in spite of the fact that the apparatus is expensive, that the rubber is severely deteriorated and worn, and that there is no means for shrinking in the horizontal direction. . Regarding the method of heat-shrinking a web by a rotating disk, see JP-B-61-534.
No. 64 has been proposed by the present inventors. However, this prior invention does not extend to reduction of the length of the web. Shrinking the web vertically is
It has become important in various fields such as films, woven fabrics, knits, and papers, but especially in the field of non-woven fabrics, it has recently become particularly important (Japanese Patent Publication No. 63-28960).

[0003]

SUMMARY OF THE INVENTION It is necessary to shrink a web in the vertical or horizontal direction in a simple manner. In these fields, the types of webs and shrinkage conditions are wide, many kinds are produced in small quantities, and processing costs are not always high.
A production method that can be highly reduced is important. In order to meet the demands in various fields in recent years, several hundred percent reduction is required. If the quality is uneven, it cannot be put to practical use, so the shrinkage and heat treatment must be uniform throughout the web.

[0004]

According to the present invention, as a result of intensive studies on a means for producing a high-quality compacted web with the simplicity of the above-described apparatus, the following means has been reached. The present invention has reached a system in which the density is adjusted by over-feeding the web to the gripping portion by using means for gripping at least both ears of the web, and then heat treating and reducing the web in that state. There are roughly two types of methods, and method A is a method using a rotating disk, and it can be shrunk by shrinking both the length and width of the web. In the method B, the density of the web is adjusted using a heating cylinder and a belt circulating thereon, and the web is mainly contracted in the vertical direction (line direction).

The method A is a means in which the pair of rotating disks grip both ends of the web, and contract in the horizontal direction of the web by the narrowing orbits of the pair of rotating disks. This means has many aspects that are effective as a simple device. Among the rotating disk systems, the pulley system is superior to the tenter gripper system in that it can grip the ears continuously and uniformly. Further, the characteristic feature is that the ears further outside the gripped ears can be brought out of the apparatus, so that the protruding portion is gripped by another gripping means on the outside, and the web is quickly fed by feeding the portion. It is possible to provide a mechanism for over-supplying the rotating disk in a folded state, and holding the over-supplying state.

[0006] Method B is a method that utilizes a method in which at least both ears of the web are gripped between a heat cylinder and a circulating belt and heat-treated. The web is supplied to the gripping portion of the circulating belt by a rotating roll type web feeding mechanism. In this method, the web is over-supplied by increasing the supply speed, and heat treatment is performed in the over-supplied state. In the method B, the vertical direction is mainly reduced, but the horizontal direction can also be reduced as shown in FIG. It is important that the supply of the circulating belt to the gripping section in the B method is performed by a rotating roll. The method using the above-mentioned thick rubber belt surface cannot freely change the contraction rate in the vertical direction unlike the present invention, and the contraction rate is small, so that the practical range is narrow.

The web used in the present invention includes ordinary spunbonded nonwoven fabrics, meltblown nonwoven fabrics, dry nonwoven fabrics, wet nonwoven fabrics, mechanically bonded nonwoven fabrics such as needle punches and stitch bonds, nonwoven fabrics such as orthogonal nonwoven fabrics, and woven fabrics. , Knit, felt, paper, film, etc. can also be used. These are made of thermoplastic polymers and need to reach the softening point with heat or steam.

In both methods A and B, heat treatment is performed after oversupply. The web after this treatment can be made into a sheet having a uniform surface by heat shrinkage, and can be used properly depending on the application, such as forming a web with embossing while leaving many folding wrinkles.
Shrinking corresponds to density adjustment, shrinkage heat treatment, and the like, which are referred to in the textile industry, by increasing the weight per unit area of a web before and after processing. The present invention enables hundreds of percent reduction using the same equipment, and
It is characterized by enabling various products from flat products to those with folding wrinkles and those with wrinkles.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a plan view showing an example in which the rotating disk is a pin type, and FIG.
Shows the device in a side view. Many needles (pins) 2 protrude in the circumferential direction of the disks 1a and 1b. Turn roll 3
The both ear ends of the raw web 4 are pierced into the needle 2 and gripped by a and 3b. The turn roll 3 is a roll having cushioning properties, such as a brush roll or a non-woven fabric roll that does not interfere with the pin. Immediately after the ear of the web 4 is pierced, there are nip rolls 5a and 5b that can change the speed, and hold both ear ends that are outside the rotating disk of the web. Then, the speed of the ear portion of the web 4 by the nip roll 5 is rotated faster than the gripping portion of the rotating disk 1. The rotating disks 1a and 1b are driven by motors M1a and M1b through drive shafts 6a and 6b, and the nip rolls 5a and 5b are also driven by motors M2a and M2b. The web 4 held by the needle 2 of the rotating disc 1 in the oversupply state
The web shrinks horizontally due to the narrowing trajectory formed by the rotating disks 1a and 1b, and the web 7 having a fold and wrinkles also shrinks vertically to become a shrinkable web 8. Although the heating in the shrinking process is omitted in FIG. 1, an infrared heater, hot air, hot water, steam, or the like can be used. When the raw web 4 is wet, hot air can be used for the drying process. Further, the method of Japanese Patent Publication No. 61-53464 of the prior invention, such as providing a degree of heating and a cooling zone in each part of the process, is also effective. When contraction in the horizontal direction is not desired, or when it is desired to reduce the amount of contraction in the horizontal direction, the orbits formed by the pair of rotating disks can be made parallel.

FIG. 3 is similar to FIG. 1, except that the ears are slit by slitters 9a and 9b immediately after the both ear ends of the web 4 are gripped, and the slit ear portions 10a and 10b
Is taken out of the system by nip rolls 5a and 5b. As the slitter 9, a knife, a razor blade, a score cutter, a shear cutter, a hot blade, a laser slit, or the like is used. Although the drive system is omitted, the rotating disks 1a and 1b are M
The nip rolls 5a, 5b are M2a,
Driven by M2b.

FIG. 4 shows an example in which the rolls 11a and 11b of the nip rolls are inside the rotating disk. Others are the same as FIG. The speed of the nip roll 11 is increased, and the edge of the web 4 is gripped while being folded on the rotating disk 1. The drive of the nip roll 11 is omitted.

FIGS. 1, 2, 3, and 4 show an example of a pin disk as a rotating disk, but a pulley type or gripper type disk can also be used. Although not shown, a multi-stage turn roll may be provided in the rotating disk as in Japanese Patent Publication No. 57-30056.

FIG. 5 is an example of a pulley type apparatus as an example of the rotating disk of the present invention. FIG. A is a plan view, and FIG.
Are shown from the side. A pair of pulleys 12
a and 12b are narrowly arranged. Pulleys 13a and 13b are provided outside the pair of pulleys 12a and 12b to form double pulleys, and belts 14a and 14b and 15a and 15b fitted to the respective pulleys are hung. The belts 14a and 14b wrapped around the pulleys 12a and 12b are substantially wrapped around a half of the belt, but the belt 15 wrapped around the pulleys 13a and 13b.
a and 15b are multiplied only in the initial part. The pulleys 13a, 13b are connected to shafts 16a, 16b.
Through the motors M3a and M3b. The extension pulleys 12a and 12b can be independently rotated with respect to the shafts 16a and 16b via bearings 17a and 17b (parts of the section of the drawing of the pulley 12 are broken). By driving the driving pulley 18a of FIG. B through the motor M4a, the belt 14a is conducted and drives the pulley 12a. The pulley 12b is driven in the same manner. The driving method of these pulleys is an example, and is not limited to these methods.

Both ends of the web 4 are connected to pulleys 13
a and the belts 15a, 13b and 15b. The pulley 13a is rotating at a relatively high speed with respect to the pulley 12. Web 4 held by pulleys 13a and 13b
Then, pulleys 12a, 12b and belts 14a, 1
At 4b, both ear ends are grasped. At that time, pulleys 12 and 1
The web fed at a speed difference of 3 and over-supplied is folded and contains a large number of wefts 7 in a pulley 12.
Is gripped by After the web 4 is securely gripped by the pulley 12, the web 4 at both ear ends by the pulley 13 and the belt 15
Of the turn pulley 19
a, removed via 19b. The web filled with pulleys is cooled by cylinders 20a and 20b (heat treatment if necessary)
As a result, the product web 8 is formed, and both ears of the product web are trimmed to obtain a product.

[0015] The plurality of rotating disks used in one device are:
Pulley type, pin type, gripper type and the like can be used in combination. For example,
The outer rotating disk is a pulley type and the inner one is a pin type. The outer rotating disk and the inner rotating disk need not have the same circumference diameter. A gripper type as another example of the rotating disk for stretching is a system shown in Japanese Patent Publication No. 63-44049. This type is used as the outermost rotating disk when used in the multiple rotating disk of the present invention since the ear does not go out of the apparatus. In FIG. 5, 2
Although an example of a heavy rotating disk has been described, there may be a case in which the disk is multiplexed with triple or quadruple, and wrinkles are formed in multiple stages. In addition, multiplexing has an effect of ensuring grip.

FIG. 6 shows an example of the system B of the present invention.
Of both ears 21a, 21b are circulating belts 22a, 22b.
And between the rotary heat cylinder 23. The drive of the rotary cylinder is omitted. Belt 22 at the web ear
The parts 21a and 21b which are grasped by the
a, 24b, and the slit ears 21
a, 21b are nip rolls 25a, 2 provided separately.
It is wound around an ear winder (not shown) through 5b.
Here, the take-up speed of the nip roll 25 is set to
The speed of the web 4 is increased and the belt 22
And the thermal cylinder 23. The web in that state is heat-treated on the cylinder 23 to be compacted.

At this time, the turn roll 26 of the circulation belt 22 may be a simple turn roll,
The outer side 27a, 27b of the turning part has a bearing and can rotate freely, so that the web 4
When the lugs 21a and 21b pass through the turn rolls 27a and 27b, the speeds of the lugs 21a and 21b coincide with each other, and the uniformity of the web after compaction is good. The blade 24 may be a sharp blade such as a razor blade, or a hot blade heated above the melting point of the web,
Rotary blades such as laser slits, score cutters and shear cutters can also be used.

FIG. 7 shows an example of the structure of the turn roll 26 shown in FIGS. 6, 9 and 10. FIG. A shows that the shaft 31 and the central portion 26 of the turn roll are formed by the key groove 32 of the shaft 31 and the keys 33a, 33b. It is fixed at. Turn roll 26
The portions of the end portions 27a, 27b, through which the circulation belt 22 does not pass, can be freely rotated by bearings 34a, 34b. In the gap between the turn rolls 27a, 27c,
The blade 24 enters and is used to cut the ears of the web. This type of turn roll 26 can be used in the case of FIG. FIG. B shows that the center of the turn roll 26 is the bearing 3.
5a, 35b so as to be freely rotatable and end portions 36a, 3b.
6b... Where the circulating belt 22 does not pass
It is fixed to the shaft 31 at 7a and 37b. The shaft 31 is driven by a pulley 38. This type of turn roll 26 can be used in FIGS. 9A and 9B and FIG. 10A.

FIG. 8 shows another example of the circulating belt shown in FIGS. FIG. A shows that not only the both ears but also the center of the web has a large number of circulating belts 22a, 22b, 22c and 22d.
This is an example using. FIG. B shows a case where a wide circulating belt 28 is used so as to grip not only the both ears of the web but also the entire width of the web, and that many holes 29 through which volatiles and vapor pass are opened. desirable. Further, it is desirable that the circulating belt 22 or 28 is release-treated with fluorine, a silicone resin, or the like.

FIG. 9 shows another example of the compaction system according to the system B. FIG. A shows a case where the outside 36a, 36b of the turn roll 26 is driven by a motor M6 through a pulley 38. 4 both ears 21a, 21b
Here, an example is shown in which nips are nipped by nip rolls 41a and 41b. The surface speed of the turn rolls 36a and 36b is rotated faster than that of the circulation belt 22, and the web is oversupplied to form a dense structure. FIG. 9B shows the outside 3 of the turn roll 25.
There are a large number of needles 42 on the surfaces of 6a, 36b, which pierce and hold the ears 21a, 21b of the web 4. Then, the speed of the turn roll 36 is increased by the motor M6 to adjust the density of the web.

FIG. 10A shows the turn rolls 36a, 3a.
6b, another circulation belts 43a and 43b are circulated, and this circulation belt 43 and turn rolls 36a and 36b are circulated.
Between the two ears 21a, 21b of the web. FIG. A shows an example in which the circulation belts 43a and 43b are driven by the motor M6, but the circulation belts 43a and 43b themselves may be driven by another drive source. FIG. 10B shows the circulating belt 22a with the cantilevered turn rolls 44a and 44b.
Turn 22b. And nip roll 4 in the middle
5a, 45b are installed, and the web 4 is nipped with it.
The speed of the nip roll 45 is changed by the drive motor M7 to adjust the web density at a relatively high speed with respect to the belt 22.

The method B of the present invention mainly focuses on reduction in the vertical direction. However, if the web 4 is slackened in the width direction before being gripped by the circulating belt 22, the slack portion also shrinks in the width direction on the heat cylinder 23, and can also serve as expansion and contraction in the horizontal direction. . However, simply sagging in the horizontal direction does not uniformly shrink. FIG. 11 conceptually shows an example of a means for uniformly shrinking in the width direction. The web 4 is nipped by groove rolls 46a, 46b (shown in cross-section of the rolls) to create a number of peaks and valleys in the vertical direction of the web. The groove roll 46 may be formed by processing the nip roll 45 in FIG. 10B into a groove roll. Although the driving of the grooved roll is not shown, the rotating roll web feeding system of the system B of the present invention rotates substantially in accordance with the feed speed of the web 4, rotates in the vertical direction, and grips the circulating belt 22. . When aiming for uniform horizontal filling, the greater the number of groove roll peaks, the better. The number of peaks depends on the thickness of the web, but for a thin web (100 g or less per hebe),
Desirably, there are a few per millimeter. In this case, the circulating belt 22 is preferably a multi-belt or a wide belt shown in FIG. Further, rolls for pressing the web 4 against the heat cylinder on the heat cylinder 23 can be provided in multiple stages. The filling ratio in the horizontal direction is determined by the depth, number, and nip gap of the grooves.

FIG. 12 shows an example of a conventional compaction prior to the present invention (for example, US Pat. No. 2,624,245).
1 and a thick rubber belt (e.g., 80 mm thick) 53 circulating through the turn rolls 52a, 52b, 52c,... Web 4
And heat-treated by heat on the heat cylinder 51 to form the shrinking web 54. In this method, the device is expensive, but the vertical shrinkage is small, and the rubber is severely deteriorated and worn,
Another drawback is that there is no means for contracting in the horizontal direction.

[0024]

As an advantage of the apparatus of the present invention, it is possible to freely adjust the size with a simple apparatus. Since it is a simple device, the cost of the device is low and the operation is easy, and it is most suitable especially for high-mix low-volume production. As an advantage in physical properties, uniform shrinkage and uniform heat treatment can be performed. In addition, there is an effect that the compaction rate can be increased, and the compaction rate of several hundred percent is easy. Another advantage is that the reduction ratio can be greatly changed by the same device. When the object of the present invention is an orthogonal nonwoven fabric, not only simple shrinkage but also shrinkage while improving the product appearance of the horizontal web is possible. In this way, products with good appearance and various reduction rates can be produced freely,
A single device can be used for various purposes. The web expanded by the present invention is rich in elasticity and is suitable for use as a supportive web for an elastic patch applied to a supporter, a knee, or the like. In addition, it was possible to obtain a highly flexible nonwoven fabric by shrinking the nonwoven fabric such as squeezed cloth by the method of the present invention.

As a special use, a nonwoven fabric heat-set with a large number of folding wrinkles inserted in an orthogonal nonwoven fabric can be manufactured to give an elastic nonwoven fabric. For example, polyvinyl alcohol-based orthogonal nonwoven fabrics are used in large quantities in greenhouses because of their hydrophilicity, heat retention, frost resistance and the like.
These expand and contract intensely due to humidity, and the house may be destroyed by the shrinkage force, or the seam of the nonwoven fabric may be broken by the shrinkage force. On the other hand, if it grows too much, water accumulates on the ceiling of the house made of nonwoven fabric, and there is light permeability and water dripping, which is not good for crops. By incorporating a number of small wrinkles according to the present invention, the above problems are eliminated. When manufacturing an orthogonal nonwoven fabric, a heat treatment cylinder is always used, and if the method B of the present invention is performed using the cylinder, it is advantageous in the manufacturing process since it does not become a separate process.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus using a pin-type rotating disk of method A.

FIG. 2 is a side view of the pin-type rotary disk device of FIG. 1;

FIG. 3 is another example (plan view) of a pin-type rotating disk of method A.

FIG. 4 is another example (plan view) of a pin-type rotating disk of method A.

FIG. 5 is an example using a pulley-type rotating disk of method A, and FIG.
Is a plan view, and FIG. B is a side view.

FIG. 6 is an example (front view) of a system B of a compacting apparatus.

FIG. 7 is an example of a structure of a turn roll of a circulation belt.

FIG. 8 is an example of a belt of the system B. FIG.
Is a wide belt.

FIG. 9 shows another example of system B. FIG. A and FIG. B (both are front views).

FIG. 10 shows another example of system B. FIG. A and FIG. B (both are front views).

FIG. 11 is a conceptual diagram of a groove roll type horizontal weaving device.

FIG. 12 is a side view of a compaction device using a thick circulation belt.

[Explanation of symbols]

1a, 1b: rotating disk, 2: multiple pins, 3a, 3
b: turn roll, 4: web web, 5a, 5b:
Nip roll, M1a, M1b, M2a, M2b, M3
a, M3b, M4a, M4b, M5a, M5b, M6,
M7: Motor, 6a, 6b: Shaft, 7: Wrinkled in web, 8: Compacted product web 9a, 9b: Slit blade, 10a, 10b: Ear of slit web, 11a, 11b: Each roll of nip roll, 12a, 12b, 13a, 13b: pulley-type rotating disk, 14a, 14b, 15a, 15b: belt,
16a, 16b: rotating disk supporting main shaft, 17
a, 17b: bearing, 18: drive pulley, 1
9: Turn pulley for belt, 20a, 20b: Cooling cylinder, 21a, 21b: Both ear ends of web, 22a, 2
2b, 22c, 22d ...: circulation belt, 23: heating cylinder, 24a, 24b: slitter blade, 25a,
25b: nip roll, 26: turn roll for circulation belt, 27a, 27b, 27c, 27d: part of the outside of the turn roll which does not pass through the circulation belt, 28: wide circulation belt, 29: hole, 31: shaft for turn roll, 32 : Key groove, 33a, 33b: key, 34
a, 34b, 35a, 35b: bearings 36a, 36b, 36c, 36d: portions through which the circulation belt outside the turn roll does not pass, 37a, 37b, 3
7c, 37d: key, 38: drive pulley, 41
a, 41b: nip roll, 42: multiple needles, 43
a, 43b: circulation belt, 44a, 44b: cantilever turn roll, 45a, 45b: nip roll,
46a, 46b: groove roll, 51: heating cylinder,
52a, 52b, 52c ...: turn roll, 53:
Thick circulating belt, 54: product web.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-282062 (JP, A) JP-A-1-156569 (JP, A) JP-A-62-97825 (JP, A) JP-A-7- 144359 (JP, A) Japanese Utility Model Showa 60-67396 (JP, U) JP-B 61-53464 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06C 3/00-29 / 00 D06B 1/00-23/30 D04H 1/00-18/00

Claims (2)

(57) [Claims] 1. A gripping binaural edges of the web to a pair of rotating disc, in a method of contracting or heat treating the web by parallel or end narrowed track formed by the pair of rotary disc one
A method for producing a compacted web by over-feeding at least the ears of the web to the gripping portions of the rotating disk by a web feeding mechanism that is faster than the rotating disks provided outside or inside the pair of rotating disks . 2. At least the edge of the web is gripped between the heat cylinder and the circulating belt, and is provided outside or in the middle of the gripping portion.
A method for producing a compacted web by over-supplying a web by a feeding mechanism using a rotating roll capable of varying a feeding speed of the web to a provided gripping portion, and gripping at least both ends of the web on a hot cylinder and heat-treating the web.