JPH01279191A - Earth cable built-in plastic hose - Google Patents

Abstract

PURPOSE:To improve kink resistance by forming an earth cable twisting together two or more streaks of carbon wires. CONSTITUTION:An earth cable 2, arranged between an inner layer plastic tube and a braided layer 3, is formed twisting together two or more streaks of carbon wires. In this way, kink resistance improves by enabling the earth cable 2 to immediately follow complicated movement of the plastic hose 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a plastic hose with a ground wire used in 4-painting operations, particularly in airless painting operations.

[Prior Art] 5th VA is a perspective view of a conventional plastic hose with a ground wire, l is an inner layer plastic hose (hereinafter referred to as a tube), 3 is a set of layers (hereinafter referred to as a -1 layer). .

), 4 is the outer plastic layer (hereinafter referred to as the outer layer),
6 is a single wire ground.

As is clear from Fig. 5, the ground wire 6 is one set of two layers
inserted between. Therefore, when the plastic hose is bent, the ground S! A6 is protected by a set of two layers 3, and has a structure that makes it difficult for abnormalities such as wire breakage to occur.

[Issue 11] However, the problem with a plastic hose with a two-layer braided structure and a ground wire is that it has high bending rigidity and the hose has poor fq 44 properties. For this reason, plastic hoses with a single layer braided construction and a ground wire have been used for their superior flexibility. However, in the case of a plastic hose with a layered ground wire, the protective effect of the ground wire is small, and there is a problem of breakage of the ground wire.

Naturally, if the ground wire of a plastic hose with a ground wire for painting is broken and its continuity is lost, there is a risk that the paint solvent will catch fire and explode due to static electricity sparks that remain in the paint gun during painting work.

[Means for Solving the Problems] The gist of the present invention is as follows: 1. By using twisted carbon wires and metal foil to plastic laminate film with excellent mechanical properties and mechanical properties as a ground wire, - The plastic hose has a layered braided structure and includes a ground wire for painting that will not break the ground wire.

[Function] The first aspect of the present invention is that the ground wire inserted between the tube and the single-layer braided layer has a structure in which a plurality of carbon wires are twisted together, so that it can sufficiently follow the various movements of the plastic hose containing the ground wire. The second reason is that the AF flexibility has been significantly improved by using metal foil to plastic laminate film as the ground wire.

[Example] Fig. 1 is a perspective view showing an example of a plastic hose with a ground wire of a finished Ijl, where l is a nylon tube or the like, 1-f, and 2 is a plurality of twisted carbon fibers. 3 is a single layer braided layer of synthetic IR male material such as vinylon thread, and 4 is an outer layer of polyurethane or the like.

FIG. 2 is a perspective view showing the configuration of the ground wire of No. 1 I71, in which two middle wire ground wires are twisted together.

The first important point of Shukan Ill is that, as shown in No. 2141, it has a structure in which multiple ground wires are twisted together so that it can immediately follow the complicated movements of the plastic hose with a ground wire, and prevents disconnection. This is what we are trying to achieve.

Figure 3 is a diagram showing the difference in kink resistance depending on whether or not the ground wire is twisted.The test method was to repeat 180' forward and reverse kinks, with the count being 1 time for both forward and reverse kinks. was positioned at the back of the hose in either forward or reverse direction.

As is clear from the 3rd UA, the plastic hose with a ground wire for painting that uses the ground wire of the present invention, which has a plurality of strands twisted together, has significantly improved kinging resistance compared to the conventional plastic hose with a ground wire. Recognize.

FIG. 4 is a perspective view of a plastic hose with a ground wire that uses aluminum foil to polyester laminate film as the ground wire according to another embodiment of the present invention, where l is a tube (such as a polyurethane tube), and 3 is a braided layer ( 4 is the outer layer (polyurethane, etc.), 5 is aluminum foil to polyester laminate film for grounding, and the laminate film was used as the grounding wire instead of the above-mentioned grounding wire. The fee is 4 yen.

[Effects of the Invention] The present invention is configured as described below, and produces the effects as described below.

a. Conventional plastic hoses with ground wires have a two-layer braided structure, so they are not very flexible and the painting process does not go smoothly. 1. With the one-layer braided structure of the present invention, the rigidity is small and the hose itself can bend. It becomes easier and increases productivity during painting work.

bUp until now, the ground wire Ff has not been connected to the hose specification or low pressure specification.
Due to concerns about iSQ, a two-layer braided structure had to be adopted, which increased the cost, but the present invention can significantly reduce the cost.

[Brief explanation of the drawing]

Fig. fjS1 is a perspective view showing one embodiment of the plastic hose with a ground wire of the present invention, and Fig. 2I21 is a perspective view showing an embodiment of the plastic hose with a ground wire of the present invention.
Fig. 4 is a perspective view showing the configuration of the + ground wire, fJIJ3 shows the difference in kinging resistance depending on whether or not the ground wires are twisted, and Fig. 4 is a perspective view showing the configuration of the ground wire according to another embodiment of the present invention. The perspective view, FIG. 5, is a perspective view IV of a conventional plastic hose with a ground wire. l...Tube 2...Twisted ground wire 3...Edition! 1st layer 4...Outer layer 5...Laminate film for grounding 6...Single wire grounding 1UA No. 3121 Moυri C] Tower'y(o) No. 4 1J

Claims (1)

[Scope of Claims] 1. A ground wire comprising one synthetic fiber braided layer on an inner plastic tube, a ground wire disposed between the inner plastic tube and the braided layer, and an outer plastic layer covering the braid. 1. A plastic hose with a ground wire, characterized in that the ground wire is a twisted wire of a plurality of carbon wires. 2 An inner plastic tube, a metal foil wound on the inner plastic tube, a plastic laminate film, one synthetic fiber braided layer braided on the laminate film, and an outer plastic layer coated on the upper layer of the braided layer. A plastic hose with a ground wire.