JPS62141168A - Apparatus for producing reticulated nonwoven fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Application in Jr Industry), 4-' The invention relates to a nonwoven fabric manufacturing apparatus for manufacturing a nonwoven fabric from a thermoplastic plastic film,
In particular, the present invention relates to an apparatus for manufacturing a reticulated nonwoven fabric formed by laminating a longitudinal web and a transverse web.

(Prior Art) When manufacturing a reticulated nonwoven fabric made of thermoplastic plastic, conventionally, as shown in Japanese Patent Publication No. 45-10778, Japanese Patent Publication No. 47-2788, etc.
The axially stretched film is formed into split fibers or narrow tapes using the split #a male method, and the split fibers or narrow tapes are arranged in a longitudinal direction with a predetermined width to form a longitudinal web, and the same split fibers or narrow tapes are , and arrange them horizontally on the vertical web while cutting them into lengths corresponding to the width of the vertical web.

By bonding and laminating these with a binder, a single piece of nonwoven fabric was obtained.

(Problem to be Solved by the Invention) However, it is extremely difficult to arrange such split fibers or narrow tapes uniformly and with equal density in the vertical and horizontal directions. Otherwise, the resulting product will be non-uniform. Therefore, when manufacturing a reticulated nonwoven fabric using the method described above, a complicated device is required to uniformly arrange the split fibers or narrow tapes. It becomes.

In addition, it is difficult to continuously produce nonwoven fabrics at high speed because the process of feeding a horizontal web onto the vertical web in a direction perpendicular to the feeding direction and cutting the horizontal web must be repeated. .

The present invention has been made in view of these problems, and its purpose is to enable continuous high-speed production of uniform reticulated nonwoven fabric using a simple device.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a pair of film feeding devices that feed continuous strips of unstretched film that becomes the longitudinal web and unstretched film that becomes the lateral web. A vertical splitting device is used to form regular longitudinal slits in the unstretched strip film fed from one film feeding device, and the unstretched film with the longitudinal slits formed therein is vertically stretched by a longitudinal stretching device. At the same time, regular lateral slits are formed in the unstretched strip film fed from the other film supply device by a lateral splitting device, and the unstretched film with the lateral slits is stretched in the horizontal direction. A stretching device is used to stretch the film in the lateral direction. Then, these stretched strip-shaped films are stacked by a laminating device so that their (;? directions are mutually -・
They are stacked in such a way that they match, and then heat-pressed and laminated.

(Function) With this configuration, when the unstretched film in which longitudinal slits are formed is stretched in the longitudinal direction, the slit forming portion becomes constricted, the slit opens, and a large number of narrow tapes are formed. A longitudinally stretched film is obtained by arranging the films at regular intervals (Q) in the longitudinal direction.Similarly, an unstretched film in which slits in the transverse direction are formed.

By stretching in the transverse direction, a transversely stretched film equivalent to a large number of narrow tapes arranged at regular intervals in the transverse direction is obtained. Therefore, simply by overlapping and laminating these, a separate nonwoven fabric with uniform vertical and horizontal meshes can be obtained.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a system diagram showing an embodiment of a reticulated nonwoven fabric manufacturing apparatus according to the present invention.

As is clear from the figure, this reticulated nonwoven fabric manufacturing device is
It is composed of a plurality of devices arranged in the upper F2 stage.

A film molding 421 is provided in the upper stage. This film forming machine 1 is a two-layer forming machine that forms molten plasticine extruded from a pair of kneading extruders 2 and 2' into a two-layer laminated film using a die 3, and each extruder 2.
2' are each supplied with different plastic raw materials from raw material supply devices 4, 4'. - - The raw material is a film material that becomes a plastic film layer that exhibits stretching strength, and the other raw material becomes a polymer layer that exhibits Ifi adhesion when heated. The material for the polymer layer is selected so that the heating temperature for exhibiting its adhesive properties is within a range that does not impair the stretching strength of the plastic film layer. Moreover, the thickness of the polymer layer is made to be 3 to 15 mm thick after stretching.

The die 3 is arranged so that when the formed film 5 is fed in the horizontal direction, the polymer layer is on the bottom side. The width of the unstretched film 5 to be formed is equivalent to the width required after stretching.

The formed film 5 is guided to a casting device 6 of a film forming machine 1, cooled and solidified, and then sent in a horizontal direction. Therefore, in this embodiment, the film forming machine 1 constitutes a film feeding device that feeds the unstretched film 5 in a continuous strip.

A vertical splitting device 7 is provided next to the casting device 6. The vertical splitting device 7 has, for example, a plurality of blades arranged in parallel in the axial direction at regular intervals on the outer circumferential surface of a roll, the blades intermittent in one circumferential direction. Therefore, in the unstretched strip film 5 introduced into the vertical splitting device 7, a large number of longitudinal cuts, that is, slits, are formed intermittently and regularly over the entire surface.

A longitudinal stretching device 8 is provided next to the longitudinal splitting device 7. This longitudinal stretching bag 218 is a roll-type stretching device consisting of a large number of rolls whose rotational speed increases from the front to the rear, and while the film 5 passes through this longitudinal stretching device 8, it is heated to a required temperature, and the film 5 is heated to a required temperature in the longitudinal direction. It is designed to be stretched at a certain magnification.

The longitudinally stretched film 5 stretched by the longitudinally stretched bag M8 is
While remaining in a state of tension, he is then guided downward.

On the other hand, another film forming machine 9 is provided at the lower stage of the manufacturing apparatus. This film forming machine 9 is also a two-layer forming machine similar to the upper film forming machine 1, and is connected to a pair of raw material supply devices 10.10' and a pair of kneading extruders 11.11'.
Different plastic raw materials are supplied to the extruders 11 and 11', and the molten plastic extruded from the extruders 11 and 11' is molded into a two-layer laminated film by the die 12. The laminated film is also said to be composed of a plastic film layer that exhibits stretching strength and a polymer layer that exhibits adhesive properties when heated.

In this case, the die 12 is arranged so that when the formed film 13 is fed in the horizontal direction, the polymer layer is on the top side. Further, the formed film 13 is guided to a casting device 14 of the film forming machine 9, cooled and solidified, and sent in a horizontal direction. Therefore, in this embodiment, this film forming machine 9 constitutes another film feeding device that feeds the unstretched film 13 in a continuous V-band shape.

The width of the unstretched film 13 to be formed is determined by taking into account the width required after stretching in the lateral direction and the stretching ratio. Moreover, the thickness of the polymer layer after stretching is 3~! The thickness is determined to be 5LL.

A horizontal splitting device 15 is provided next to the casting device 14. This horizontal split device 15 is, for example,
It is like having a large number of axially intermittent blades arranged in parallel at regular intervals in the circumferential direction on the outer peripheral surface of the roll. In that case, the blades should not be sharpened at both ends of the roll. Therefore, in the unstretched strip-like film 13 guided to the horizontal splitting device 15, a large number of horizontal cuts, that is, slits, are formed intermittently and regularly on the entire surface of the unstretched film 13 except for both ends in the width direction. Ru.

A horizontal stretching device 16 is installed next to the horizontal splitting device 15. This lateral stretching device 16 is a tenter-type stretching device using clips, and the film 13 is heated to a required temperature while passing through this lateral stretching device 16, and is stretched in the lateral direction at a required magnification. It has become.

This lateral stretching device 16 is equipped with a number of clips greater than the number of clips forming the length required for lateral stretching, and a laminating device 17 is provided at the rear end of the tenter. This laminating device 17 includes a heating device 18 that heats the longitudinally stretched film 5 sent from the upper longitudinally stretched device 8, a heating device 19 that heats the film 13 that has been horizontally stretched by the horizontally stretched device 16, and these longitudinally stretched films. 5 and a crimping device 20 for overlapping and crimping the horizontally stretched films 13 from the inside and outside using rolls. Note that the heating device 19 for heating the horizontally stretched film 13 may be a heating device for horizontally stretching as it is.
are supplied at the same running speed, and their belt directions are made to match.

The width of the longitudinally stretched film 5 is set to a width that can fit between the crimps of the tenter, so that the longitudinally stretched film 5 is maintained in a tensioned state in the vertical direction, and the horizontally stretched film 13
These are stacked while being held in tension in the transverse direction.

In this way, the longitudinally stretched film 5 and the laterally stretched film 13
The separate nonwoven fabric 21 formed by laminating the above is wound up by a winding device 22.

Next, the operation of the reticulated nonwoven fabric manufacturing apparatus configured as described above will be explained.

The two-layer film 5 formed by the upper film forming machine 1 is fed in the horizontal direction with the polymer layer facing down. After a large number of longitudinal slits are cut in the entire surface by the longitudinal splitting device 217, the material is stretched in the longitudinal direction by the longitudinal stretching device 8. When the film 5 is stretched longitudinally, the space between the slits of the film 5 becomes constricted and the slits open. Therefore, the film 5 has many 1! The state is as if narrow tapes were lined up in the vertical direction. Moreover,
Since the slits are provided intermittently and regularly, the film 5 is in a state equivalent to narrow tapes regularly arranged in a predetermined width. The film 5 thus longitudinally stretched is then sent to the lower stage side.

On the other hand, the two-layer film 13 formed by the lower film forming machine 9 is fed horizontally with the polymer layer facing upward.

And the side split outfit! After a large number of lateral slits are cut on the entire surface except for both side edges by ai 15,
It is stretched in the lateral direction by a lateral stretching device 16. When the film 13 is stretched laterally, the space between the slits of the film 13 becomes constricted and the slits open. Therefore, the film 13 has a state in which a large number of uniaxially stretched tapes with a width of 10I are arranged in the horizontal direction. Moreover, since the thrifts are provided intermittently and regularly, the film 13 is in a state equivalent to that of a regular arrangement of narrow tapes of a predetermined length.

The longitudinally stretched film 5 sent from the upper stage and the horizontally stretched film 13 formed at the lower stage are heated to a polymer layer by heating devices 18 and 19 of the laminating device 17 provided at the rear end of the horizontal stretching device 16. It is heated to a temperature that exhibits adhesive properties. In the laminating device 17, the films 5 and 13 run at the same speed and have their strip directions aligned with each other, and are pressed together by the pressing device 20. At this time, each film 5.13 is folded together with its polymer layer forming the laminated inner surface, so that it is firmly contacted by the polymer layer. In this way, #1-shaped nonwoven fabric 21 is formed. Moreover, since the lamination is carried out while maintaining the tension state of each film 5.13 after stretching, the lamination is performed while maintaining the state in which the meshes are uniformly formed at the same density during stretching. , the nonwoven fabric 21 obtained by laminating them is also 1,11
The first stitch is uniform and has equal density.

In addition, in the above embodiment, the longitudinally stretched film 5
Although the film 13 and the film 13 to be laterally stretched are both formed as a two-layer film, it is also possible to form only one of the films 5 or 13 into a two-layer film. Alternatively, both of these films 5 and 13 may be made into one layer, and an adhesive layer may be applied to the inner surface of the laminated film in the laminating device 17 or the like.

Further, in the above embodiment, the nonwoven fabric manufacturing apparatus has a film molding fit 9 for molding each film 5, 13, but it is also possible to use preformed films. In that case, the wound unstretched film is transferred to the vertical splitting device 7 and the horizontal splitting device 1 by a film supply device such as a roll.
5 may be supplied continuously.

(Effects of the Invention) As is clear from the above description, according to the present invention, after forming regular longitudinal slits in one unstretched film, the slits are stretched in the longitudinal direction, and the other unstretched film is stretched in the longitudinal direction. After forming regular lateral slits in the stretched film, the slits are stretched in the lateral direction, so that a narrow tape consisting of a large number of uniaxially stretched films can be made to have a predetermined width in the vertical direction and a uniform density. This results in two types of arrays: one in which similar narrow tapes of a predetermined length are arranged in a lateral direction with equal density and uniformity. Therefore, by laminating these, a separate nonwoven fabric having a uniform density can be obtained.

Furthermore, the formation of these slits, stretching, and lamination can be performed continuously while the film is running at a constant speed using a splitting device, a stretching device, and a laminating device, respectively, so that the reticulated nonwoven fabric can be i
! Continuously.

Moreover, it becomes possible to manufacture at high speed.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of a reticulated nonwoven fabric manufacturing apparatus according to the present invention. 1... Film forming machine (film supply device) 2.2'
...Kneading extruder 3...Die 5...Film 6...
・Casting device 7...Vertical split device 8...Vertical stretching device 9...Film forming machine (film supply device) 11.1
1'...Kneading extruder 12...Die 13...Film 14
... Casting device 15 ... Lateral splitting device 16 ... Lateral stretching device 17 ... Laminating device 18.
19...Heating device

Claims (3)

[Claims] (1) A pair of film feeding devices that feed two sheets of unstretched film in continuous strips, and a vertical slit that forms regular longitudinal slits in the unstretched strip of film fed from one of the film feeding devices. a splitting device; a longitudinal stretching device for longitudinally stretching the unstretched film in which longitudinal slits have been formed by the longitudinal splitting device; a horizontal splitting device that forms slits in the horizontal direction, a horizontal stretching device that horizontally stretches the unstretched film in which the horizontal slits have been formed by the horizontal splitting device, and stretched strips sent from the longitudinal stretching device and the horizontal stretching device, respectively. An apparatus for producing a reticulated nonwoven fabric, comprising: a laminating device for stacking films on top of each other so that their band directions match each other and bonding them under heat. (2) Each of the film supply devices includes a film forming machine, and at least one of the film forming machines is a two-layer forming machine that forms a polymer layer that exhibits adhesive properties when heated on one side of the film. An apparatus for producing a reticulated nonwoven fabric according to claim 1. (3) The apparatus for producing a reticulated nonwoven fabric according to claim 1, wherein the laminating device is provided at an inner rear end of the lateral stretching device.