JPH0784698B2 - Nonwoven fabric manufacturing method and punching device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric manufacturing method and a punching device, and is used for a nonwoven fabric manufacturing method and a punching device used for industrial materials such as household scrubbers, cushions and various filters.

[0002]

2. Description of the Related Art Conventionally, a raw material fiber aggregate which has been defibrated by a defibrating machine or the like to have a predetermined thickness of raw material fiber (hereinafter referred to as "raw material fiber aggregate").
Say. ), There is a needle punching method. This needle punch method pushes the fibers in the raw material fiber assembly by vertically moving a large number of needles having a barb and piercing the raw material fiber assembly,
It is a method of joining a two-dimensional non-woven fabric by intertwining three-dimensional fibers. Specifically, as shown in FIG. 3, the lowered needle 3 is the needle passage hole 4 of the stripper plate 4.
1 to be inserted into the hole 61 of the bed plate 6 to pierce the raw material fiber assembly 5 fed between the stripper plate 4 and the bed plate 6. When the lowered needle 3 moves upward, it is separated from the raw fiber aggregate 5 by the action of the stripper plate 4. By repeating such a punching operation, the raw material fiber assembly 5 is three-dimensionally sewn. In recent years, this method has been improved and speeded up, and has come to be widely applied as a method for joining raw material fiber aggregates of a dry nonwoven fabric.

[0003]

However, in the above-described conventional manufacturing method and punching device, since the tip of the needle 3 is inserted into the hole 61 of the bed plate 6, the finished product is collected in the raw material fiber assembly 5. In comparison, it was thinner and harder, and had a certain thickness, and was unsuitable for applications such as household scrubbing, which requires a soft feeling and a volume feeling. In order to avoid this, if the supply amount is increased and a thick product is manufactured, the needle 3 is not pierced well, the bottom surface is rubbed and wavy, and the softness does not appear and the product value is lowered. ,
In addition, profitability was also poor. On the other hand, if the punching frequency is reduced to give a soft feeling while maintaining a constant thickness with the same supply amount, the raw material fiber assembly 5 is stagnated before the delivery roller 7, and the raw material fiber assembly 5 is sewn. Since the amount is small, there was a problem that it could not be sent to the next process.

The present invention is intended to overcome the above-mentioned problems, and the surface of the raw material fiber assembly after being sewn is flattened, and the finished product retains the strength such that it is not easily peeled off, while having a soft feeling and a volume. An object of the present invention is to provide a method for manufacturing a non-woven fabric and a punching device for the nonwoven fabric, which have an increased commercial value by retaining a feeling of stuffiness. In particular, it is intended to be useful for production of cushions, filters, etc. that require high air permeability.

[0005]

A method for manufacturing a nonwoven fabric according to the first aspect of the present invention is to arrange a defibrated raw material fiber on a belt conveyor so as to be a raw material fiber aggregate having a predetermined thickness, and thereafter,
The raw-material fiber assembly that moves with the movement of the belt conveyor is subjected to needle punching with a needle that is planted on a needle base, and at that time, the tip of the needle is To approach the surface of the belt conveyor,
A barb is also provided on the tip side of the needle. Here, the "burve" means a small spine provided on the needle.

The method for producing a non-woven fabric according to the second aspect of the present invention includes
In the method for producing a nonwoven fabric of the invention, the raw material fiber aggregate has a thickness of 35 to 45 mm, the thickness after the needle punching is 20 to 30 mm, and the yarn weight is 5
It is characterized by being 80 to 610 g / m ² .

The non-woven fabric punching device of the third invention is
A belt conveyor, a stripper plate which is arranged on the belt conveyor at a predetermined interval and has a needle passage hole, and a needle which passes through the passage hole and has a barve are planted. And a vertically movable needle base, and the needle is moved to the lowest point at the surface proximity point of the belt conveyor through the passage hole as the needle base moves up and down. It is characterized in that it is vertically moved so as to form a point, thereby punching the raw material fiber assembly conveyed between the belt conveyor and the stripper plate.

[0008]

According to the method of manufacturing a nonwoven fabric and the punching device according to the present invention, the needle planted on the needle base moves up and down so that the surface proximity point of the belt conveyor becomes the lowest point. Moreover, since a needle having a barb up to the needle tip is used, the unevenness of the non-woven fabric surface caused by inserting even the hole of the conventional bed plate is not seen, and the non-woven fabric surface is flattened over the entire area. Even stitches can be made across.
Then, since the needle is not thrust into the hole of the bed plate and the closest point is the surface proximity point of the belt conveyor, the non-woven fabric gives a soft feeling and a volume feeling even with the same number of punching times as the conventional method. Can be obtained.
Furthermore, even if the number of times of bunching is slightly reduced, the belt conveyor is used instead of the conventional bed plate.
It is possible to obtain a bulky and soft finished product that is the target product without the problem that it cannot be transferred to the next step.

[0009]

EXAMPLES The present invention will be specifically described below with reference to examples. Example (1) Configuration of punching device for producing non-woven fabric FIG. 1 shows an example of a punching device for producing non-woven fabric according to the present invention, which includes a belt conveyor 1, a needle base 2 and a nibble base 2. -$ 3, stripper plate 4,
Composed of. As shown in FIG. 1, the belt conveyor 1 has a four-roller 11a, 11b, 11c, and 11d to form a trapezoidal cross section, and presses the lower side toward the upper side to prevent the belt 12 from bending. Thus, the roller 11e is arranged. Here, the belt width is about 1200 mm, and the belt speed is configured to be variable according to the carrying capacity of the raw material fiber assembly 5, the type of material, and the like.

The needle base 2 is a base on which the needle 3 is needled, and the needle 3 is mounted on a needle board (not shown) on the needle base 2. Fixed. With this configuration, the needle base 2 is moved up and down by being combined with the pneumatic or hydraulic piston drive device, and thus the needle 3 is moved.
Will also move up and down. While the needle 3 is piercing the raw material fiber assembly 5, the belt conveyor 1
The mechanism is such that the progress of the raw material fiber aggregate is stopped by linking with. As shown in FIG. 1, the needle base 2 is arranged at an upper position in parallel with a flat surface 121 of an upper side of a trapezoid formed by the rollers 11b and 11c of the belt conveyor 1. The needle 3 has a barb 31 up to the needle tip as shown in FIG. The needle 3 used in the conventional device is
The needle 3 provided in the punching device according to the present invention is formed with the barbs 31 concentrated on the tip side of the needle 3, as compared with the case where the needle 31 is formed uniformly over the entire dollar 3. . Further, the tip of the needle is set so that the surface proximity point of the belt conveyor 1 becomes the lowest point as the needle base 2 moves up and down. This is because punching can also be performed on the raw material fiber assembly 5 close to the surface of the belt conveyor 1 so that three-dimensional stitching similar to the other can be performed on such a portion.

The stripper plate 4 is placed between the belt conveyor 1 and the needle base 2, and specifically, as shown in FIG. 1, from the flat surface 121 of the belt conveyor 1 to the raw fiber assembly 5. It has a plate surface which is arranged at a constant height in consideration of the bulkiness and the like and which can cover a large number of upright needles 3. Then, a needle passing hole 41 corresponding to the needle 3 is formed in the stripper plate 4, and if the needle 3 that moves upward during the needle punching is easily dissociated from the raw material fiber assembly 5. It plays a role to close. Raw fiber assembly 5
Is a laminate of defibrated raw material fibers having a predetermined thickness. After being fed from the feed apron 8 and conveyed between the belt conveyor 1 and the stripper plate 4, it is taken out from the delivery roll 7 in the next step. Then, in the process of transporting between the belt conveyor 1 and the stripper plate 4, the needle 3 is moved up and down and the needle 3 is moved.
Has a configuration in which the raw material fiber assembly 5 is punched.

(2) Manufacture of Nonwoven Fabric The raw material fiber assembly 5 used in this example is vinylidene chloride fiber. Thread thickness is 70 denier, cut length is 7
It is a 6 mm cut, and various curl degrees can be selected. When the purpose of the product is different, it goes without saying that the type and properties of the fiber can be changed. The raw material fibers are preliminarily disentangled in a defibrating machine, the raw material fibers are put into an arranging machine, and the yarns are further defibrated and arranged neatly and uniformly so that a raw material fiber aggregate 5 having a thickness of 35 to 45 mm is set on a conveyor. To do. Then, the raw material fiber assembly 5 is put into the feed apron 8.

Then, the raw material fiber assembly 5 is tightened while flowing over the belt conveyor 1 and moving on the rising surface 122 of the belt conveyor 1. After that, while the raw material fiber assembly 5 moves along the movement of the belt conveyor 1 on the flat surface 121, the needle 3 planted on the needle base 2 performs the needle punching. This needle punching operation is set so that the tip of the needle 3 approaches the surface of the belt conveyor 1. Specifically, the distance between the surface of the belt 12 and the tip of the needle at the lowest point is 0.
Within 5 mm. Moreover, since the barb 31 is also provided on the tip side of the needle 3, the raw material fiber assembly 5 is sewn between the fibers as a whole in the needle punching process, and the thickness thereof is reduced. Go. By such needle punching operation, the raw material fiber assembly 5 was 580
Converted to a non-woven fabric with a yarn weight of 610 g / m ² . Then, the punched non-woven fabric is taken out via the delivery roller 7, sprayed with latex on both sides of the non-woven fabric, dried, and then subjected to final thickness setting to produce a target product. did it. Here, the latex is a concentrate of rubber sap and has a function of glue. In this example, a urethane adhesive was used.

(3) Effect of the embodiment By using the punching device of this embodiment to manufacture the non-woven fabric according to this embodiment, even if the number of times of punching is about the same as in the conventional case, the tip of the needle is the belt 12. Since it moves up and down so that the surface proximity point is the lowest point, it is possible to reduce the yarn weight, and it is possible to make a product with a soft feeling and a volume feeling. Even if the punching device according to the present embodiment has the above-mentioned structure, since the barb 31 is also provided on the tip side of the needle 3, the finished product can be easily flattened on its surface. It retains the strength to prevent peeling. Further, the belt conveyor 1 is used in place of the bed plate of the conventional method, and in addition, in this embodiment, the raw material fiber assembly 5 which has finished the needle punching is the belt conveyor 1
Since it is placed on the descending slop and is discharged to the delivery roller 7 side, the stagnation of the raw material fiber assembly 5 before the delivery roller 7 which has been conventionally seen due to the acceleration of gravity on the descending surface 123 is eliminated.

The present invention is not limited to the specific examples described above, and various modifications may be made within the scope of the present invention depending on the purpose and application. That is,
The needle shape, needle arrangement, specifications of the stripper plate, etc. can be variously selected according to the type of raw material fiber assembly, the finished state of the product, and the like.

[0016]

As described above, the nonwoven fabric manufacturing method and punching apparatus according to the present invention make the lowest point of the needle end of the belt conveyer even when the same number of needle punching operations as the conventional one are performed. Since the points are close to the surface, it is possible to provide a finished product with a soft feeling and a volume feeling. For this reason, cushions, filters, which require air permeability,
It can be used for household scrubbing. In this case, the unit weight is reduced and the profitability is improved. Further, since the barb is also provided at the tip of the needle, the raw material fiber assembly can be sewn as a whole and the entangled surface can be flattened to produce an excellent product without product peeling.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a punching device according to an embodiment.

FIG. 2 is an explanatory diagram of a needle used in FIG.

FIG. 3 is a schematic sectional view of a conventional punching device.

[Explanation of symbols]

1; Belt conveyor, 11a to 11d; Roller, 12;
Belt, 2; needle base, 3; needle, 31; bar
4; stripper plate, 41; needle passage hole, 5; raw material fiber assembly, 6; bed plate, 61;
Pore, 7; Deli Berry Roller, 8: Feed Apron.

Claims (3)

[Claims] 1. A defibrated raw material fiber is arranged on a belt conveyor so as to be a raw material fiber aggregate having a predetermined thickness, and then the raw material fiber aggregate which moves with the movement of the belt conveyor is Needle punching is performed by a needle that is planted on the needle base, with the tip of the needle being brought close to the surface of the belt conveyor, A method for manufacturing a non-woven fabric, characterized in that a barb is also provided on the tip side. 2. The raw material fiber assembly has a thickness of 35 to 45.
mm, and the thickness after the needle punching is 20 to
It is 30 mm, and the yarn weight is 580 to 610 g.
/ M ^{2 The} method for producing a nonwoven fabric according to claim 1, wherein 3. A belt conveyor, a stripper plate disposed on the belt conveyor at a predetermined distance and having a hole for passing a needle, and a barber passing through the hole for passing a needle. And a needle base that is vertically movable and is planted with the needle, and the needle moves up and down with the needle through the hole for passing the needle. Is moved up and down so that the surface proximity point of the belt conveyor is the lowest point, thereby punching the raw material fiber assembly conveyed between the belt conveyor and the stripper plate. Non-woven punching device.