JPS6022620B2 - Method for manufacturing a band with a soft outer skin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a band having a fertilized outer skin used for packaging, agriculture, etc.

Conventionally, this type of band consists of a plurality of stretched synthetic resin long core materials that are passed through an extruder in parallel, the core materials are extruded and coated with a soft resin, and the core materials are connected and integrated with the soft resin. Manufactured by

However, this manufacturing method has the drawback that precision is required for extrusion molding such as centering of a mold in order to coat the core material with a soft resin by extrusion, which requires time and effort.

In addition, since the soft resin is simply extruded and coated, the soft resin that forms the outer skin has a low strength and is prone to vertical cracking. As a result of intensive research in view of these conventional drawbacks, the present inventors have completed a method for manufacturing a band having a soft outer skin that eliminates the above-mentioned drawbacks.

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

In the drawing, 1 is a mold attached to the tip of a general-purpose extruder for synthetic resins.

Reference numeral 2 denotes a band-shaped body, in which soft molten resin is extruded from the mold 1 into a band-shaped body.

In addition, synthetic resins such as polyethylene, polyamide, polyester, etc. are used as the gill resin. Reference numeral 3 denotes a long core material made of synthetic resin, which is in the form of a strip or line extending in the length direction, and its cross-sectional shape is not particularly limited, such as rectangular or circular.

The elongated core material 3 is made of a synthetic resin such as polypropylene, polyethylene, polyamide, polyester, or a mixture thereof, and is preferably made of a resin that is compatible with the strip 2. In addition, when the longest core material 3 is in the form of a strip, if the outer wall is embossed, the strip 2 will be stuck in the embossed part, and the long core material 3 and the strip 2 will come into close contact. It is preferable because the properties are improved. Reference numeral 4 denotes a press roll, which is used to press the strip 2 and the elongated core material 3 together.

The pressure roll 4 may be a heat roll. Next, the manufacturing method of the present invention will be sequentially explained with reference to FIG.

First, a soft molten resin is extruded as a strip 2 from a mold 1 of an extruder.

Next, while the strip 2 is still in a molten state, a plurality of long core materials 3, 3, . . . are placed on the strip 2 in parallel as shown in FIG. Like band 2
and the long core materials 3, 3, . . . are fused and crimped together. That is, the strip 2 and the long core materials 3, 3 are pressed while being spread in the width direction by the pressure rolls 4, 4.
...is to be crimped. Further, the elongated core material 3 may be extruded and stretched in a separate process, or it may be extruded and then stretched and then crimped with the strip 2 as described above.

Further, the welding may be facilitated by preheating before pressing the band-shaped body 2 together. Example Polyethylene was extruded as a strip from a mold of an extruder at a temperature of 200°C, and a long polypropylene core material stretched in the length direction with a width of 5 ribs and a thickness of 0.5 ribs was placed on the extruded strip. The two pieces are placed in parallel, and then the strip and the long core material are passed between crimping rolls and bonded, and the crimping is integrated into a single piece with a width of 1.
A band having a shape as shown in Fig. 3 was obtained with 5 ribs and a thickness of 0.7 ribs.

As described in detail above, the manufacturing method of the present invention involves fusing a plurality of elongated synthetic resin cores in parallel to the strip while the strip is still in a molten state, and also fixing the strip in the width direction. Since it is pressed out and integrated, there is no need for extrusion molding such as centering the mold as in the past.

In addition, ``Since the long core is destroyed while the strip is still in a molten state immediately after extrusion, there is no need to reheat the strip.
The process is simple and manufacturing is easy.

Furthermore, since the strip to which the longest core material is fused is spread out in the width direction and the long core material is crimped and integrated, the strip and the long core material are firmly fused together, and the strip is wide. It is possible to improve the strength in the width direction.

Furthermore, since the elongated synthetic resin core is used, the strength in the longitudinal direction of the band is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the manufacturing method of the present invention, and FIG.
The figure is a cross-sectional view taken along the row 0 line in Figure 1, and Figure 3 is a cross-sectional view along the line 0 in Figure 1.
-A cross-sectional view along the m line. 1... Mold, 2... Band-shaped body, 3...
...Long core material, 4. ．． ．． ．． ．．・Shodori roll Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 Extrude the soft molten resin as a strip from a mold of an extruder, and while the strip is still in a molten state, a plurality of elongated synthetic resin core materials drawn in parallel are placed on the strip between pressure rolls. 1. A method for manufacturing a band having a soft outer skin, characterized in that the band is fused by passing through it, and the band-like body is expanded in the radial direction and crimped and integrated.