JPS59178209A - Manufacture of band made of synthetic resin - Google Patents

Abstract

PURPOSE:To provide the improvement for longitudinal cracks and thickness effect by scattering independently recessed portions on one side, recessed portions on both sides simultaneously and nonrecessed portions on both sides on the synthetic resin band drawn through between emboss rollers. CONSTITUTION:Low grade foamed synthetic resin-band 1 is made of a flat strip with a comparatively narrow width molded by an extrusion molding machine, using polyolefine such as high density-polyethylene or polypropylene as its raw material. After drawing treatment is longitudinally applied to said band 1, the band 1 is supplied to the gap between emboss rollers 3, 4 of one set and is embossed. The emboss rollers are combined in such a manner that while arranging projected portions like a regular pyramid at a constant interval in lateral and longitudinal directions, the positions of said projected portions 2 are mutually changed for both longitudinal and transverse directions. The recessed portions are formed totally in the width-direction of the band, and the molecular orientation of the resin is disturved, thereby reducing remarkably longitudinal cracks also.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves stretching a relatively narrow and flat strip made of synthetic resin such as high-density polyethylene or polypropylene by extrusion molding in the longitudinal direction and embossing it on both the front and back surfaces. This invention relates to a method for manufacturing a synthetic resin band made by applying the same method, and its purpose is to improve longitudinal splitting properties and to impart a texture.

It is known that embossing is applied to both the front and back sides of this type of synthetic resin hunt to improve its flexibility, longitudinal tear prevention properties, and friction resistance.

However, the enhancement of these synthetic resin hands was done so that convex portions were located at mutually corresponding locations on both the front and back sides, or so that concave and convex g1s that fitted into each other were located on both the front and back sides. It is poor in vertical splitting resistance and wall thickness, and in particular, low-foamed synthetic resin hanger 1- has shortcomings in the above-mentioned longitudinal splitting resistance and wall thickness, as well as in the rigidity required for binding. was.

The present invention was invented in view of the above, and is an integrated structure in which the positions of the square jd-shaped or truncated pyramid-shaped convex portions are arranged in both the vertical and horizontal directions with a constant width in both the vertical and horizontal directions, and are combined so that they are different from each other. A synthetic resin band I stretched in the longitudinal direction is supplied between the embossing rollers for embossing, and the synthetic resin band is individually scattered with concave portions on one side, concave portions on both sides at the same time, and non-concave portions on both sides. The purpose of the present invention is to provide a method for manufacturing a synthetic resin hunt.

The present invention will now be explained in detail based on embodiments shown in the drawings.
AJ fat bread I. Fig. 1 is a partially enlarged perspective view, Fig. 2 is a partially enlarged sectional view, and Fig. 3 is an arrangement of concave portions formed on both the front and back surfaces. An enlarged plan view showing
Figures 4 and 5 show embossing rollers, where Figure 4 is a developed view and Figure 5 is a vertical side view of a pair of embossing rollers, which are extruded from polyolefin such as high-density polyethylene or polypropylene. A low-foaming synthetic resin hunt 1 made of a relatively narrow and flat band formed by a molding machine is stretched in the longitudinal direction to form regular square pyramid-shaped protrusions 2 spaced at regular intervals in both the vertical and horizontal directions.
The embossing rollers 3 and 4 are arranged in such a way that the positions of the convex portions 2 are different from each other in both the vertical and horizontal directions and are supplied between integral embossing rollers 3 and 4 to carry out enforcing.

That is, as shown in FIG. 4, the pair of embossing rollers 3 and 4 are arranged both vertically and horizontally with an interval equal to the length of the side 4a. As shown in FIGS. 4 and 5, each convex portion 2
are combined so that they are offset from each other by a length of 3a in both the vertical and horizontal directions.

As shown in FIGS. 1 to 3, the synthetic resin hand supplied to the pair of embossing rollers 3.4 and embossed has a concave portion 6 on one side, with the four portions 5 formed on only one side. Both sides simultaneously formed recessed portions 7 and both sides non-recessed portions 8 are formed so as to be located independently at +1.

In addition, in the case where the square pyramidal surfaces a1 and 2 are used in the present invention, the above-mentioned recessed portions are independently scattered, and the shape of the four portions 5 formed gives a thickening effect to the synthetic resin band 1. If the convex portion 2 is in the shape of a regular square pyramid, there is no problem even if the convex portion 2 is in the shape of a regular square '1 ((r trapezoid).

As is clear from the above, the present invention arranges convex portions in the shape of a regular square pyramid or truncated square pyramid at regular intervals in both the vertical and horizontal directions, and the positions of the convex portions are A synthetic resin band stretched in the longitudinal direction is supplied and embossed between a pair of embossing rollers that are assembled differently, and the synthetic resin hand is made with a concave portion on one side and a concave portion on both sides at the same time. Appropriate rigidity necessary for bundling, as the recessed parts are individually scattered and tightened.
Furthermore, the shape and arrangement of the recessed portions provides a thickening effect, and since the recessed portions are formed throughout the width direction and the molecular orientation is disturbed, longitudinal cracking is also significantly reduced.

[Brief explanation of the drawing]

1 to 3 show a synthetic resin hand manufactured according to the present invention, in which FIG. 1 is a partially enlarged perspective view;
Fig. 2 is a -mJ enlarged sectional view, Fig. 3 is an enlarged plan view showing the arrangement of concave portions formed on both the front and back surfaces, and Figs. 4 and 5 show the Enphos roller. , FIG. 4 is a developed view, and FIG. 5 is a vertical W1 side view of a pair of Enphos 1 colas. ] - Synthetic resin hand 2 - One convex part 3.4 - One embossing roller 5 - One gate part 6 - One side recessed part 7 - Both sides simultaneously recessed part 8 - One side without recess 815 minutes

Claims (3)

[Claims] (1) Between a pair of embossing rollers formed by arranging convex portions in the shape of a regular square &fn or square & A synthetic resin band stretched in the longitudinal direction is supplied and embossed to the synthetic resin hand, and single-side recessed parts, both-side simultaneous recessed parts, and both-side non-recessed parts are independently scattered on the synthetic resin hand. Manufacturing method of synthetic resin). (2) A pair of embossing rollers are each 2a in both the vertical and horizontal directions.
Square pegs or square pegs with one side having a length of 4a arranged at intervals of the length of 2. A method for producing a synthetic resin IS according to claim 1, wherein the IS is made of a synthetic resin and is assembled so that the lengths of 3a and 3a are shifted from each other. (3) The method for producing a synthetic resin hand l' according to claim 1, wherein the synthetic resin hand is a low-foaming synthetic resin hand made of polyolefin.