JPH0329356Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a string material, and more specifically, to an improvement of a reinforced synthetic resin string material.

[Prior Art and Problems to be Solved] Conventionally, string materials such as presser tapes in which a core material made of one or more stretched synthetic resin monofilaments is coated with a non-stretchable thermoplastic synthetic resin have not been used in practice, for example. This is known from Japanese Patent Publication No. 3-12254 or Japanese Utility Model Application Publication No. 56-11286, and these string materials are used for various purposes such as wrapping, packing, or fixing steel plates.

By the way, string materials containing such presser tapes are used in the agricultural and horticultural fields, for example, for fixing vinyl films in greenhouses, but when the string material is blown by strong winds, If the core material is constantly in contact with or sliding against the core material, the covering part will wear out, and the covering part and the core material will separate or even break, creating problems that need to be solved in terms of strength. .

[Means for solving problems]

Therefore, in this invention, in a synthetic resin string material formed by coating a core material made of one or more synthetic resin drawn monofilaments with a thermoplastic synthetic resin, this drawn monofilament core is used. In order to improve the strength, the twisted core material and the thermoplastic synthetic resin covering material are integrally attached to each other by twisting the materials in opposite directions in order at predetermined dimensions to form a twisted core material. It is something to do.

In this case, at least two twisted core materials are arranged in parallel and positioned so that the opposing portions of each twisted core material are twisted in opposite directions, and furthermore, these twisted core materials are arranged in parallel. If it is formed into a tape shape by coating it with a thermoplastic synthetic resin coating material, it can not only be suitably used for fixing vinyl films in greenhouses, but also provide a high-quality product that does not twist.

[Effect]

In the synthetic resin string material according to this invention, both the core material, which is twisted in opposite directions for each predetermined dimension, and the covering material, which is integrated with this twisted core material, are subjected to impact and tensile forces applied to the string material itself. It is something that opposes external forces such as force.

〔Example〕

Next, as a preferred embodiment of the synthetic resin string material according to the present invention, a presser tape for fixing a vinyl film for a vinyl house will be exemplified and explained in detail with reference to the accompanying drawings.

1 and 2, the fixing tape 10 according to the present invention is made by, for example, bundling an appropriate number of stretched monofilaments 12 of high-density polyethylene, and tying the tape every few meters to the right, left, and right. By sequentially twisting in opposite directions, a pair of twisted core materials 14a and 14b are formed, and with these twisted core materials 14a and 14b arranged in parallel with a predetermined distance apart, for example, low density polyethylene resin is It is constructed by integrally and tightly covering the material 16 with a covering material 16 consisting of the material 16 and forming it into a tape shape.

At this time, if a predetermined portion of one twisted core material 14a is twisted in the right direction, the twisted core materials 14a and 14b are twisted in the other twisted core material 14b opposite to this rightward twisted portion α. The part β is twisted to the left so that the twisting directions are opposite to each other (first
(see figure). In addition, these twisted core materials 14a, 14
As a means for coating b with the coating material 16, a method is suitably adopted in which the twisted core materials 14a and 14b are forced to pass through the molten coating material in a coating die at a predetermined speed and then forcibly cooled.

When the presser tape 10 configured in this way is used for fixing vinyl film in a greenhouse, external forces such as impact force and tensile force applied to the presser tape 10 will be applied to the presser tape 10 in the opposite direction sequentially for each predetermined dimension. Moreover, the twisted core materials 14a, 14b twisted so as to face each other, and the twisted core materials 14a,
14b and the integrated covering material 16, it is reinforced and durability can be improved. Furthermore, as is clear from FIG. 3, the rotation moments m generated in the twisted core materials 14a and 14b act in directions that cancel each other out, so that twisting or the like does not occur in the presser tape 10 itself. .

On the other hand, FIG. 4a shows a twisted core material 14 formed by twisting a bundle of drawn high-density polyethylene monofilaments 12 in opposite directions sequentially, such as rightward, leftward, and rightward every few meters, and then coated with polyethylene as it is. Fig. 4b shows another string material 18 according to the present invention which is integrally covered with a material 16, and Fig. 4b shows a bundle of high-density polyethylene stretched monofilament 12 sequentially coated every few meters in the right direction, the left direction, and the right direction. Yet another string material 20 according to the present invention is constructed by integrally covering three twisted core materials 14a to 14c formed by twisting in opposite directions with a polyethylene covering material 16, but these strings In the case of material, both the twisted core material 14 and the covering material 16 integrated with the twisted core material 14 resist external forces such as impact force and tensile force, as in the case of the above-mentioned presser tape. It is.

[Effect of idea]

As mentioned above, according to the string material according to the present invention, both the twisted core material and the covering material integrated with this twisted core material resist external forces, so it is possible to use a core material that is not twisted at all. When compared to the string material used, its strength can be increased by more than 10%. Also,
As the surface of the core material is twisted in opposite directions, unevenness is formed on the surface of the core material, increasing the contact area with the sheathing material and making the integration more reliable. Therefore, due to external force, the core material and sheathing material are It is possible to avoid inconveniences such as separation of the core material, and furthermore, since the twisting moment generated in the cross section of each twisted core material cancels out each other, it is possible to avoid twisting when it is made into a product. It has various advantages, such as the fact that it does not have to be used, and its practical effects are extremely large.

Although preferred embodiments of the synthetic resin string material according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a presser tape for fixing a vinyl film as a preferred embodiment of the synthetic resin string material according to the present invention, and Fig. 2 is an enlarged cross-sectional view of the presser tape shown in Fig. 1. Figure 3 is the first
FIGS. 4a and 4b are explanatory diagrams of the rotation moment generated in the twisted core material of the presser tape shown in the figure, and are partially cutaway explanatory diagrams of different synthetic resin string materials according to the present invention. 10... Fixing pressure tape, 14... Twisted core material, 12... High density polyethylene stretched monofilament, 16... Covering material (low density polyethylene),
18,20...String material.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A synthetic resin string material formed by coating a core material made of one or more synthetic resin stretched monofilaments with a thermoplastic synthetic resin. A twisted core material is formed by sequentially twisting stretched monofilament core materials in opposite directions at predetermined dimensions, and the twisted core material and a thermoplastic synthetic resin covering material are integrally attached to each other. Synthetic resin string material. (2) At least two twisted core materials are arranged in parallel with a predetermined distance apart, and the opposing portions of each twisted core material are positioned so that they are twisted in opposite directions, and these twisted core materials are The synthetic resin string material according to claim 1, which is a registered utility model, and is constructed in the form of a tape by covering a core material with a thermoplastic synthetic resin covering material.