JPH0532704Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a fluororesin tube with a colored identification means that does not contaminate the transferred liquid.

[Conventional technology]

Generally, tubes made of polymeric materials such as synthetic resins are colored with pigments in various colors for various reasons such as preventing incorrect piping and identifying internal fluids.
available for use.

By the way, in such a colored tube, the coloring agent dispersed within the tube wall elutes into the transferred liquid, even if only in a small amount, so depending on the application, such as the transfer of high-purity liquid, this elution may be ignored. It may not be possible. In this case, even if the tube wall is made of a material with excellent non-contamination properties such as fluororesin, it is difficult to completely prevent contamination of the transferred liquid as long as it contains a colorant. Therefore, it has been proposed to make the tube a two-layer structure, with the inner layer made of uncolored fluororesin and the outer layer, which does not come into contact with the transferred liquid, made of colored synthetic resin. From this point of view, a significant increase in manufacturing costs is unavoidable, and, like conventional tubes, color changing operations during the extrusion molding process are troublesome. Note that identification by printing on the outer circumferential surface of the tube, which is used for other synthetic resin tubes other than fluororesin tubes, is not possible if a highly non-adhesive resin such as fluororesin is used, in which case surface treatment is applied to the outer circumferential surface of the tube in advance. Until now, no economical means of identification for fluororesin tubes has been proposed, as it can only be applied to tubes that have been treated with fluororesin.

[Problem that the invention attempts to solve]

This invention was made in view of the above-mentioned drawbacks of the prior art, and does not contaminate the transferred liquid.
Moreover, it is an object of the present invention to provide a tube made of fluororesin and equipped with a colored identification means that can be manufactured economically.

[Means for solving problems]

In order to achieve the above object, in this invention, a colored synthetic resin monofilament is embedded along the longitudinal direction inside the tube wall of a single-layer tube body made of at least translucent uncolored fluororesin. composition.

[Effect]

According to this invention, a synthetic resin monofilament colored in a desired color is embedded inside the tube wall of a single-layer tube body made of a translucent or transparent fluororesin that does not contain a colorant.
The color of the monofilament within the tube wall, which is visible from the outside, makes it as easy to identify as conventional colored or printed tubes.

In addition, the colored monofilament made of synthetic resin has moderate rigidity, and because of this property, it is less likely to meander in the die during extrusion molding of the tube body, so it can be held in a predetermined position and securely attached to the inside of the tube wall. It can be buried in That is, since the colored monofilament containing pigments etc. is not exposed on the inner peripheral surface of the tube body, due to the inherent characteristics of fluororesin,
Pigments and other contaminants are not leached into the transfer liquid, resulting in a tube with excellent contamination properties.

Furthermore, when changing colors, all you have to do is change the colored monofilament, so there is no wastage of resin due to the color change, and if you connect colored monofilaments of different colors in advance, you can continue manufacturing as is. As a result, the fluororesin tube with colored identification means is manufactured at a lower manufacturing cost than conventional tubes.

〔Example〕

The figure is a cross-sectional view showing one embodiment of a fluororesin tube according to this invention. The illustrated tube 1 has a structure in which a synthetic resin monofilament 3 colored to a desired color is embedded approximately parallel to the longitudinal direction inside the tube wall of a tube body 2 made of translucent or transparent uncolored fluororesin that does not contain coloring agents such as pigments.

When such a tube 1 is extruded into the fluororesin tube shape, the tube body 2 is formed by passing the colored monofilament 3 through a predetermined position in the die, that is, through the flow path of the molten fluororesin. It can be buried inside the pipe wall. In this case, the monofilament 3 made of synthetic resin has higher rigidity than the colored filament formed on tape or multifilament, so it is less likely to meander within the die when extruding the tube body 2.
held in place. Therefore, the monofilament 3 can be completely buried inside the tube wall, and even if the tube wall is thin, the monofilament 3 will not be exposed on the surface of the tube body 2.

In addition, it is possible to provide two or more colored monofilaments 3, and in that case, it is not necessary to use the same colored monofilaments, and by combining colored monofilaments of different colors, it is possible to easily identify many types. You can get a tube.

[Effect of idea]

As explained above, in the tube according to this invention, a monofilament colored in a desired color is buried along the longitudinal direction within the tube wall of a single-layer tube body made of at least translucent uncolored fluororesin. Since the monofilament is configured so that it can be seen through from the outside, it can be identified in the same way as conventional colored tubes or printed tubes.

Furthermore, since the color of the tube can be changed simply by replacing the monofilament, there is no wastage of expensive fluororesin, which can significantly shorten the working time, reducing manufacturing costs along with the advantages of the single-layer structure. It is also effective.

In particular, this fluororesin tube uses a highly rigid colored monofilament as the filament for identification, so it is easy to position when extruding the tube, and it is possible to reliably embed it inside the tube wall. can. Therefore, the colored monofilament containing pigment etc. is not exposed on the inner circumferential surface of the tube, so the excellent non-contamination property of the tube body made of fluororesin can be utilized as is, and the transferred liquid will not be contaminated.

Note that this invention is not limited to the above-mentioned embodiments, and it is of course possible to make various changes within the technical idea of this invention, such as changing the shape of the tube body.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of the fluororesin tube according to this invention. 1...Fluororesin tube, 2...Tube body, 3...Colored monofilament.

Claims (1)

[Scope of utility model registration request] A fluororesin tube comprising a monofilament of a colored synthetic resin monofilament embedded along the longitudinal direction within the tube wall of a single-layer tube body made of at least translucent uncolored fluororesin.