JPH04267149A - Preparation of laminate - Google Patents

Abstract

PURPOSE:To simplify a structure and to achieve cost reduction, in a laminate wherein first and second strip materials are laminated on a laminating rotary member, by pressing the second strip material arranged to the inside of the first strip material to the peripheral surface of the rotary member by the tension of the first strip material. CONSTITUTION:A multilayer film consisting of high density polyethylene layer being an inside layer and a low density polyethylene layer being an outside layer is stretched in its longitudinal direction and, further, slits intermittent in a zigzag pattern are formed to the stretched film in the same direction to form a longitudinal web (first strip material) 2 composed of a longitudinally uniaxially stretched net like material expanded in predetermined width. Slits intermittent in a zigzag pattern are formed to the part excepting both tab parts of the multilayer film of the same kind in parallel to the lateral direction of the film and the slitted film is stretched laterally to form a lateral web (second strip material) 3 composed of a laterally uniaxially stretched net like material. The lateral web 3 is placed on the inside of the longitudinal web 2 and pressed to the outer periphery of a laminating roll (rotary member) 1 under heating by the tension of the longitudinal web 2 using a press roll 6 to prepare a desired laminate 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a method of laminating a vertical web having strength in the length direction (longitudinal direction) and a horizontal web having strength in the width direction (horizontal direction) by laminating and adhering them on a rotating drum. Relating to a method of manufacturing a body.

0002

BACKGROUND OF THE INVENTION Conventionally, a method for producing this type of laminate includes laminating and heat-treating a longitudinal web having strength in the length direction and a lateral web having strength in the width direction on a heat cylinder. At least both ends of the stacked vertical and horizontal webs are held between a circulating belt under tension and a heat cylinder, and heat treated while regulating widthwise shrinkage of the horizontal webs (Japanese Unexamined Patent Application Publication No. 1983-1993). No. 45858) is known.

0003

[Problems to be Solved by the Invention] Since the above method requires a circulation belt, a mechanism for changing the position according to the width of the various horizontal webs is required, which not only complicates the structure but also increases the height. There is a problem with price.

The present invention has been made in view of the above circumstances, and its object is to provide a method for manufacturing a laminate that can simplify the structure and reduce the cost.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a method for laminating a first and a second strip on a laminating rotating member, the method comprising: It is characterized in that it is located inside the first band-like body and presses the second band-like body against the circumferential surface of the rotating member by the tension of the first band-like body.

[0006] The first band-shaped body may have strength in the length direction over the entire width direction, and the second band-shaped body may have a part in the width direction that is easily loosened.

[0007] Further, the first band-shaped body has strength in the length direction at least at both ends in the width direction, the second band-shaped body has a portion that is susceptible to heat shrinkage in the width direction, and The lamination of the second strip and the second strip may be performed by heating on a lamination rotating member.

[0008] Further, the first band-shaped body may have strength in the length direction at least in a part in the width direction, and the second band-shaped body may have a portion that is easily displaced in the width direction.

[0009] Furthermore, the first band-shaped body may have strength in the width direction, and the second band-shaped body may have strength in the length direction.

[0010] Furthermore, before the second band-like body is introduced onto the circumferential surface of the rotating member, tension is applied to the second band-like body in the width direction, and the second band-like body is placed in this state or immediately after the tension is released. The belt-like body may be pressed against the circumferential surface of the rotating member by the tension of the first belt-like body.

[0011]

[Operation] The inner band is pressed against the rotating member by the tension of the outer band.

0012

Embodiment An embodiment of the present invention will be described below with reference to FIG.

In this figure, 1 is a vertical web (first strip)
This is a lamination roll (rotating member) for heating the horizontal web 2 and the horizontal web (second band-shaped body) 3 in a laminated state.

[0014] The vertical web 2 is made by, for example, stretching a multilayer film with a high-density polyethylene layer on the inside and a low-density polyethylene layer on the outside in the length direction, and further forming slits in the same direction in a zigzag pattern or the like. It is a longitudinally uniaxially stretched net-like body which has been expanded to a predetermined width, has strength in the length direction throughout the width direction, and can maintain tension.

[0015] The horizontal web 3 is formed by forming slits parallel to the width direction and intermittent in a zigzag pattern, for example, in a portion of a multilayer film with a high-density polyethylene layer on the inside and a low-density polyethylene layer on the outside, excluding both edges. After that, 4-10 in the width direction.
It is a transversely uniaxially stretched network that has been stretched approximately twice as long. Although this horizontally uniaxially stretched net-like body has strength in the width direction, since it is conveyed with tension only at both side ear portions, a portion in the width direction, for example, the central portion, tends to loosen. Furthermore, when heated, the material is thermally shrunk in the width direction, and the state of the shrinkage is not uniform, which tends to cause disturbances such as waving, twisting, meandering, and wrinkles.

Around the lamination roll 1, there is a guide roll 4 that guides the longitudinal web 2 onto the surface of the lamination roll 1, and a guide roll 4 that guides the longitudinal web 2 and the horizontal web 3 heated by the lamination roll 1 to the lamination roll 1. A press roll 6 such as a rubber roll is provided that creates a nonwoven fabric (laminate) 5 by pressing and crimping and separates it from the lamination roll 1.

Further, on the upstream side of the guide roll 4 in the transport direction of the vertical web 2, there is a transport roll 7 for transporting the vertical web 2.
is provided at a position close to the guide roll 4, and transports the horizontal web 3 while spreading it in the width direction, and transports the laminated roll 1 and the horizontal web 2.
A pair of clock guiders 8 are respectively provided for supplying between the two.

The cross guider 8 conveys the ear part of the horizontal web 3 diagonally outward with respect to the direction in which the horizontal web 3 is transported, and applies tension to the horizontal web 3 outward in the width direction.

Next, a method of manufacturing a nonwoven fabric by laminating the vertical web 2 and the horizontal web 3 will be explained.

After the vertical web 2 is conveyed by the conveying roll 7, it is turned by the guide roll 4 and the laminated roll 1 is turned.
will be guided towards. On the other hand, the horizontal web 3 is introduced into a pair of cross guiders 8 and is spread in the width direction by the cross guiders 8, thereby being kept in a tensioned state. This horizontal web 3 is then introduced between the lamination roll 1 and the vertical web 4 with virtually no slack.

These vertical webs 2 and horizontal webs 3 are conveyed along the circumferential surface of the laminating roll 1 as the laminating roll 1 rotates, with the vertical webs 2 on the outside and the horizontal webs 3 on the inside. Tension is applied to the outer longitudinal web 2 in the length direction over the entire width direction by adjusting the speeds of the conveyance roll 7, the guide roll 4, and the pressure roll 6. Due to this tension, the outer vertical web 2 presses the horizontal web 3, which has a portion that is easily loosened in the width direction, onto the circumferential surface of the lamination roll 1. Both webs 2
. Ru. Both heated webs 2 and 3 are pressed together by the pressing force of the press roll 6 and the lamination roll 1, thereby creating a laminate 5.

[0022] According to the above structure, the vertical web 2 has tension in the longitudinal direction over the entire width direction, and the horizontal web 3 has a portion that is easily loosened in the width direction and is likely to undergo heat shrinkage in the width direction. When laminating these on the laminating roll 1, the horizontal web 3 is positioned inside the vertical web 2, and the horizontal web 3 is pressed against the circumferential surface of the laminating roll 1 by the tension of the vertical web 2. Therefore, the horizontal web 3 does not loosen and is free from waving and twisting due to heat contraction in the width direction.
The fibers are laminated while preventing disturbance of the fibers such as meandering and wrinkles as much as possible, and the fibers can be arranged in an orderly manner in the width direction.

Note that the present invention is not limited to the above embodiments. That is, in the above embodiment, the vertical web 2 has tension in the vertical axis direction over the entire width direction, but the horizontal web 3 does not have a part in the width direction that is easily loosened. If heat shrinkage tends to occur in the width direction, vertical web 2
does not need to have tension in the length direction over the entire width direction, but only needs to have tension in the length direction at least at both ends in the width direction, and presses both ends of the horizontal web 3 at both end portions. By doing so, it is possible to prevent fiber disturbances such as waving, twisting, meandering, and wrinkles due to heat contraction in the width direction.

[0024]Although the above-mentioned horizontal web 3 has strength in the longitudinal direction at both edges in the width direction, if the strength of the ears is weak or non-existent, that is, the horizontal web 3 is strong in the width direction. If the longitudinal web 2 has a part that is likely to shift, the horizontal web 3 should be prevented from shifting in the width direction, as long as the longitudinal web 2 has tension in the longitudinal direction in at least a part of the width. Can be done.

Furthermore, in the above examples, a multilayer film having a low-density polyethylene layer and a high-density polyethylene layer was used as the film, but the strip body applicable to the present invention can be obtained from a film made of such a thermoplastic resin. It is not limited to things.

The longitudinal web 2 may be of any type as long as it can be tensioned in the longitudinal direction to the extent that lamination adhesion can be performed well. For example, a longitudinally uniaxially stretched body obtained by stretching a film, a woven fabric, a nonwoven fabric, a thermoplastic resin film, etc. in the length direction, or a longitudinally uniaxially stretched network body in which slits are formed in the length direction of the longitudinally uniaxially stretched body, etc. can be used. . Further, the horizontal web 3 is not limited to that of the above embodiment, and may be a horizontally uniaxially stretched film made of a thermoplastic resin stretched in the width direction.

[0027]Although in the above embodiments a heat fusion method was used as the lamination adhesion method, the lamination adhesion method is not limited to this. For example, there is a method in which a portion of at least one of the strips is melted or softened by heating and then pressure bonded, and a method in which an adhesive is applied to at least one of the strips and then dried by heating.

Furthermore, as shown in FIG. 2, a cross guide 8 and a level expander 9 may be used together to tension the horizontal web 3. This level expander roll 9 is a polygonal roll having a large number of flat plates (not shown) arranged in parallel on its circumferential surface in the width direction (in the axial direction of the roll), and is installed between the cross guider 8 and the introduction roll 4. It is being The flat plate is made up of three parts: left, right, and center, and each flat plate except the central part moves sequentially in the width direction symmetrically as the roll rotates, and reciprocates once during one rotation of the roll. By expanding the flat plate to the left and right, tension is applied outward in the width direction to the horizontal web.

[0029]

As described above, the present invention provides excellent effects such as simplifying the structure and reducing the cost.

[Brief explanation of the drawing]

[Figure 1] Diagram showing one embodiment of the present invention

[Figure 2] Diagram showing a modified example

[Explanation of symbols]

1: Rotating member for lamination (laminate roll), 2: First strip (vertical web), 3: Second strip (horizontal web), 4: Guide roll, 5: Laminated body (nonwoven fabric), 6: Press roll.

Claims (6)

[Claims] Claim 1. A method of laminating first and second strips on a laminating rotating member, the method comprising: positioning the second strip inside the first strip; A method for manufacturing a laminate, which comprises pressing the first belt against the circumferential surface of the rotating member using tension. 2. The first band-shaped body has strength in the length direction over the entire width direction, and the second band-shaped body has a part in the width direction that is easily loosened. The method for manufacturing a laminate according to claim 1. 3. The first strip-shaped body has strength in the length direction at least at both ends in the width direction, the second strip-shaped body has a portion that is susceptible to heat shrinkage in the width direction, and 2. The method of manufacturing a laminate according to claim 1, wherein the lamination of the strips is carried out by heating on a rotating member for lamination. 4. A claim characterized in that the first band-shaped body has strength in the length direction at least in a part of the width direction, and the second band-shaped body has a portion that is easily displaced in the width direction. Item 1. A method for producing a laminate according to item 1. 5. The method for producing a laminate according to claim 1, wherein the first strip has strength in the length direction and the second strip has strength in the width direction. . 6. Before introducing the second strip onto the circumferential surface of the rotating member, tension is applied to the second strip in the width direction, and the second strip is placed in this state or immediately after the tension is released. The first strip
2. The method of manufacturing a laminate according to claim 1, wherein the laminate is pressed against the circumferential surface of the rotating member by the tension of the belt-like body.