JPH05293906A - Production of partially adhesive laminate - Google Patents

Abstract

PURPOSE:To enable partial lamination in one stage and to enhance productivity and tear strength by providing unevennesses on the surface of a press roller and partially contact-bonding the base material and thermoplastic resin in the case of extruding thermoplastic resin and performing laminating work. CONSTITUTION:In the case of delivering base material 12 such as fabric and nonwoven fabric from a first delivering machine 11 and performing polysandwiching by mutual base materials, the other base material 20 is delivered from a second delivering machine 19. Further thermoplastic resin 14 is extruded from a T-die extruder 13 and pressed by a press roll 15 and a cooling roll 16 and laminated on the base materials. The obtained laminated material is wound by a winder 18. In this case, a press roll 1 having a pattern provided with e.g. circularly projected parts 2 on the surface is used as the press roll 15. The part contact-unbonded by the press roll 15 is formed as an unadhesive part. The partially contact-bonded part is formed as an adhesive part. Thereby the laminated material proper for a medical sheet and a surgical goom or the like is obtained which is excellent in the touch, flexibility and tear strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partial adhesive laminate, and more specifically, a synthetic resin film is partially adhesively laminated on a base material such as a woven fabric or a non-woven fabric to obtain a laminated material excellent in texture and tear strength. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, in the field of medical sheets, surgical clothes, etc., a synthetic resin film laminated on a substrate such as a non-woven fabric, or various laminated materials obtained by polysanding substrates are used. . However, since these laminated materials are usually formed by adhesively laminating each layer over the entire surface, the original soft feeling of the nonwoven fabric or the like is impaired, and especially when they are brought into close contact with the body, there is a stiff discomfort. There are cases.

In order to solve such a problem, an apparent partial adhesive laminate is used by partially applying an adhesive such as a hot melt resin between a base material and a synthetic resin film. However, this method has a problem in that an extra bonding step is required, which complicates the process, and an extra cost for the adhesive and the bonding step is required, resulting in a high cost.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention provides a method for producing a partially adhesively laminated laminate material which solves these problems all at once.

[0005]

That is, the present invention is characterized in that, when a thermoplastic resin is extruded and laminated, unevenness is provided on the surface of a press roll to partially press-bond the base material and the thermoplastic resin. The present invention is concerned with a method of manufacturing a partially adhesive laminate.

Examples of the thermoplastic resin used in the present invention include polyester resins, polyamide resins and polyolefin resins, which may be used alone or in combination. Of these, polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polyamide resins such as nylon 6 and nylon 66 are preferable if heat resistance is particularly important. Also, the texture,
From the viewpoint of workability, polyolefin-based polymers are preferable, and among them, polypropylene, polyethylene, and ethylene-vinyl acetate copolymer are particularly preferable. In particular, ethylene / vinyl acetate is preferable if the feeling is important, and polypropylene or polyethylene is preferable if the processability and heat resistance are important. Among polyethylene, ultra low density polyethylene is preferable from the viewpoint of feeling.

In the present invention, a press roll having an uneven surface is used. Concavo-convex is such that the convex portion serves as the laminate adhesive portion and the concave portion serves as the non-adhesive portion. Therefore,
As long as this function is fulfilled, the shape and size are not particularly limited, but typical patterns are shown in FIGS.

FIG. 1 is a pattern in which circular convex portions 2 are provided on the surface of the press roll 1, and FIG. 2 is a pattern in which the arrangement of the circular convex portions 2 in FIG. 1 is changed. 1 and 2, the circular convex portion 2 may have any shape such as a truncated cone shape, a semicircular shape, a bell shape, a polygonal shape, a star shape, and a heart shape.

FIG. 3 shows a pattern in which the streak convex portion 3 is provided in the length direction of the press roll 1. Further, FIG. 4 shows a pattern in which the streak convex portion 4 is provided in the circumferential direction of the breath roll 1.

FIG. 5 shows a method of extrusion laminating a thermoplastic resin according to the present invention. In the figure, when the base material 12 is fed from the first feeding machine 11 and the polysands are made between the base materials, the other base material 20 is also fed from the second feeding machine 19 and the thermoplastic resin 14 is fed from the T die extruder 13. Extrusion,
A press roll 15 and a cooling roll 16 are pressed to bond the base materials to each other, or the base materials are bonded to each other to be laminated and integrated, and the obtained laminated material 17 is wound by a winding machine 18.

The laminated material obtained as described above has a structure as shown in FIG. 6 and FIG. 7, respectively. First, in FIG. 6, a portion which is not partially pressure-bonded by a press roll (a portion other than a convex portion on the surface of the press roll). ), The non-adhesive portion 21 is formed, and the portion is partially crimped (the convex portion on the press roll surface).
And the thermoplastic resin 14 is applied to the base material 12.
Is a partially bonded laminated material (two layers). Further, in FIG. 7, the base material 12 and the base material 20 are made of the thermoplastic resin 14,
It is a partially bonded laminated material (three layers) having a non-bonded portion 21 and a bonded portion 22 as in the above.

During laminating, the crimping area that is partially crimped is 1/2 to 1/3 of the area that is not crimped.
0 is preferable, and more preferably 1/15 to 1/5. When it is larger than 1/2, the feeling and tear strength are not so effective, and when it is smaller than 1/30, there may be a problem in practicality due to poor adhesion to the substrate. In addition, since the pressure increases as the proportion of the crimping area that is partially crimped decreases, the durability of the press roll surface decreases.

A partially adhesive laminate can be produced in the same manner by providing unevenness on the surface of the cooling roll 16, but since the material of the cooling roll surface is usually hard chrome, it can be processed for a long time. Meanwhile, there is a problem that the surface of one of the rubber press rolls is worn due to the unevenness of the surface of the cooling roll, and the cooling effect is also hindered due to the reduction of the cooling area. In contrast,
As in the present invention, the above problem is solved by providing unevenness on the surface of the rubber press roll that retains elasticity to some extent.

In the present invention, the base material on which the thermoplastic resin is partially adhered and laminated is suitable for a woven fabric or a non-woven fabric which is required to retain the texture and tear strength, and paper or a film may be used. .

[0015]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto.

Example 1 Ultra low density polyethylene "Ultzex-15100C" (manufactured by Mitsui Petrochemical Industry Co., Ltd.) was applied onto a rayon non-woven fabric (weight per unit area: 70 g / m ² ) as a substrate by a conventional method using a T-die extruder. Was laminated by extrusion at a T-die temperature of 330 ° C. (resin thickness 15 μm). The rubber press roll under the T-die extruder has the pattern shown in FIG.
The crimping area to be partially crimped is 1 / the area not crimped
A press roll designed to be 10 was used. During extrusion lamination, the convex part of the press roll is partially pressure-bonded, so the laminated non-woven fabric becomes a laminated body that partially has an adhesive part and a non-adhesive part, and as shown in Table 1, has flexibility and tear strength. Excellent medical sheets were obtained.

Example 2 Using the apparatus shown in FIG. 5, rayon non-woven fabric (with a basis weight of 32 g /
m ² ) as one of the base materials is fed from the first feeding machine, and on the other hand, the base material (polyester nonwoven fabric: basis weight 3) from the second feeding machine.
2 g / m ² ), and the same resin as used in Example 1 was extruded between the two from a T-die extruder at a T-die temperature of 330 ° C., a processing speed of 100 m / mim, and a resin thickness of 15 μm (so-called polysandwich). (Laminate), and both were bonded and integrated. The obtained laminated body was excellent in flexibility and tear strength, as shown in Table 1, since it partially had a laminate-bonded portion and a non-bonded portion. When a non-woven gown was made using this, it had excellent flexibility and was sufficiently comfortable to wear.

Comparative Example 1 According to Example 1, a base material (rayon non-woven fabric: 70 g / m ^{2 of} basis weight) was coated with "Ultzex-15100C" by a method of press-bonding the entire surface using a normal rubber press roll having no irregularities on the surface. When a laminate was obtained by extrusion lamination with a thickness of 15 μm, as shown in Table 1, only medical sheets having inferior flexibility and tear strength as compared with Example 1 were obtained.

Comparative Example 2 A base material (rayon non-woven fabric: basis weight 32 g / m ² ) and a base material (rayon non-woven fabric) were prepared according to Example 2 by a method of press-bonding the entire surface using a normal rubber press roll having no irregularities on the surface. Polyester non-woven fabric: 32 g / m ^{2 of} basis weight and "Ultzex 1
5100C "15 μm thick was polysandwich laminated to obtain a laminate. When a gown was made using this, as shown in Table 1, only a gown which was inferior in flexibility and tear strength to the gown of Example 2 was obtained.

The results of the bending resistance (here, the flexibility) and the tear strength of the four types of laminates obtained as described above are shown in Table 1.

[0021]

[Table 1]

[0022]

As described above, according to the present invention, since a partial lamination can be performed in one step, it is possible to provide a laminated material having high productivity and excellent feeling and tear strength.

[Brief description of drawings]

FIG. 1 is a perspective view showing a convex pattern provided on the surface of a press roll.

FIG. 2 is a perspective view showing a convex pattern provided on the surface of a press roll.

FIG. 3 is a perspective view showing a convex pattern provided on the surface of a press roll.

FIG. 4 is a perspective view showing a convex pattern provided on the surface of a press roll.

FIG. 5 is a schematic diagram of an extrusion laminating and poly sandwich laminating method.

FIG. 6 is a schematic sectional view showing an example of a laminated material obtained by the present invention.

FIG. 7 is a schematic sectional view showing an example of a laminated material obtained by the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Press roll 2 Cylindrical convex part 3 Streak convex part 4 Streak convex part 11 1st feeding machine 12 Base material 13 T die extruder 14 Thermoplastic synthetic resin 15 Press roll 16 Cooling roll 17 Laminate 18 Winder 19 2nd feeding machine 20 Base material 21 Non-adhesive part 22 Adhesive part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 27/36 7016-4F // B29K 23:00 67:00 77:00 105: 20 B29L 9: 00 4F (72) Inventor, Hiiragi Ohara, 13-13 Antachi, Suminoe-ku, Osaka City, Osaka Prefecture Goyo Paper Works Co., Ltd.

Claims (4)

[Claims] 1. A method for producing a partially adhesive laminate, characterized in that, when a thermoplastic resin is extruded and laminated, unevenness is provided on the surface of a press roll to partially press-bond the base material and the thermoplastic resin. 2. The method according to claim 1, wherein the thermoplastic resin is at least one selected from the group consisting of polyester resins, polyamide resins and polyolefin resins. 3. The manufacturing method according to claim 1, wherein the crimping area to be partially crimped is 1/2 to 1/30 of the area not to be crimped. 4. The method according to claim 1, wherein the base material is a woven fabric or a non-woven fabric.