JP7253236B2 - Water thread for civil engineering or construction work and its manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water thread used to indicate a horizontal line in civil engineering or construction work, and a method for manufacturing the same.

2. Description of the Related Art In civil engineering works and building works, water threads are stretched between pillars or the like in order to indicate a horizontal line. Conventionally, spun yarn, synthetic resin monofilament yarn, or synthetic resin multifilament yarn has been used as the water thread. However, since these water threads lack stretchability, they have the drawback that if they are stretched under strong tension, the water threads will break due to the load of a slight external force. On the other hand, if the tension is weak, the stretched central portion becomes slack, making it difficult to show an accurate horizontal line.

For this reason, it has been proposed that a water thread has a core made of rubber thread and a sheath made of a braid made of fiber thread covering the core (Patent Document 1). Such a water thread can solve the conventional drawbacks due to the elasticity of the rubber thread. However, since the water thread is often used outdoors, there is a problem that the rubber thread tends to deteriorate and the service life of the water thread is short.

Registered Utility Model No. 3104024

SUMMARY OF THE INVENTION An object of the present invention is to provide a water thread for civil engineering or construction work that is excellent in stretchability without using a rubber thread.

The present invention solves the above problems by adopting a textured yarn obtained by subjecting a synthetic resin multifilament yarn to a specific processing. That is, the present invention relates to a water thread for civil engineering work or construction work, which is obtained by twisting a plurality of Taslan processed yarns of synthetic multifilament yarns, and a method for producing the same.

As the synthetic fiber multifilament yarn used in the present invention, conventionally known ones are used. Generally, polyethylene terephthalate fiber multifilament yarn, nylon fiber multifilament yarn or polypropylene fiber multifilament yarn is used. In particular, multifilament yarn made of polyethylene terephthalate fiber has excellent weather resistance and is suitable as a material for water yarn used outdoors. The fineness and the number of filaments of the synthetic fiber multifilament yarn are also used within a conventionally known range, for example, 300 to 2500 decitex/30 to 200 filaments.

As the synthetic resin multifilament yarn, it is preferable to use a pre-dyed yarn having a predetermined color in order to make the water thread easier to see. The reason for using dope-dyed yarn is that the color does not fade due to rainwater or the like. When dyed yarn is used, the color tends to fade due to rainwater or the like. Although the color is arbitrary, it is preferable to use a bright color, such as yellow, pink, orange, red, blue, or green. Further, the color of the dope-dyed yarn is preferably fluorescent. Fluorescent color makes it easier to see and easier to shoot. Specific examples of fluorescent colors include fluorescent yellow, fluorescent pink, fluorescent orange, fluorescent red, and the like.

A taslan processed yarn is obtained by subjecting a synthetic resin multifilament yarn to taslan processing. Taslan processing is a process in which compressed air is blown onto a substantially non-twisted synthetic resin multifilament yarn to disturb each filament, forming a loop in each filament and entangling the filaments together. be. Therefore, the taslan-finished yarn is bulky and has a rough surface. The water thread for civil engineering or construction work according to the present invention is obtained by arranging a plurality of such Taslan processed threads and then twisting them together.

The twisting of the taslan textured yarn can be performed by any method. For example, after twisting Taslan processed yarn to obtain a single yarn, a plurality of yarns (generally 2 to 3 yarns) are aligned and then twisted to perform civil engineering work according to the present invention. It is possible to obtain water thread for use in construction or construction work. In this case, the water thread becomes relatively thin. In addition, after arranging a plurality of Taslan processed yarns, they are subjected to a first twist to obtain a lower twisted yarn, and then a plurality of the lower twisted yarns are aligned and then subjected to upper twisting to obtain the civil engineering or Water thread for construction work can be obtained. At this time, it is preferable that the twist directions of the first twist and the final twist are opposite to each other. That is, when the first twist is an S twist, the final twist is preferably a Z twist, and when the first twist is a Z twist, the final twist is preferably an S twist. Such a twisting method improves the morphological stability of the water thread. In this case, a relatively thick thread can be obtained.

The number of taslan-textured yarns to be arranged in the first twist is arbitrary, and the number of the first-twisted yarns to be arranged in the second twist is arbitrary, but is generally about 2 to 3 yarns. For example, two taslan-textured yarns can be pulled together to obtain a ply twisted yarn, and then three ply twisted yarns can be arranged and twisted to obtain a water thread. Alternatively, three taslan-textured yarns can be arranged and twisted together to obtain a lower-twisted yarn, and then two lower-twisted yarns can be arranged and twisted together to obtain a water thread. Incidentally, the diameter of the water thread is about 1.0 mm.

The water line for civil engineering work or construction work according to the present invention is provided by being wound around a reel, and is used by a conventionally known method. That is, it is used to indicate a horizontal line by tying a string to each support.

In the water thread for civil engineering or construction work according to the present invention, since each filament constituting the Taslan processed thread forms a loop, it is easy to stretch in the longitudinal direction, and even if rubber thread is not used, each support can be It is effective in being able to stretch well between them. In addition, since the water thread formed from taslan-processed yarn is bulky, it has a larger diameter than that formed from multifilament thread, and has the effect of making the water thread easier to see. Furthermore, since the surface of the water thread formed from taslan-processed thread is rough, it has the effect of being difficult to unravel when tied to a support.

Example 1 A polyethylene terephthalate multifilament yarn (yellow dope-dyed yarn) of 1100 decitex/96 filaments was prepared. This multifilament yarn was subjected to Taslan processing to obtain a Taslan processed yarn. Two strands of this Taslan textured yarn were aligned and S-twisted at a twist number of 346 times/m to obtain a lower-twisted yarn. Three strands of this under-twisted yarn were arranged and Z-twisted at a twist number of 160 times/m to obtain a water thread for civil engineering or construction work.

Comparative Example The polyethylene terephthalate multifilament yarn used in the example was twisted in the same manner as in the example without being subjected to taslan processing to obtain a water thread for civil engineering or construction work. Specifically, two polyethylene terephthalate multifilament yarns were aligned and S-twisted at a twist number of 346 times/m to obtain a first twisted yarn. Three strands of this under-twisted yarn were arranged and Z-twisted at a twist number of 160 times/m to obtain a water thread for civil engineering or construction work.

Elongation rate at 50 N load of the water thread obtained in the example (measured according to the method described in JIS L 1013. The tester uses a constant-speed elongation type, and the tension speed is 20 cm / min at a grip interval of 20 cm. ) was 4.5%, and the elongation of the water thread obtained in the comparative example under a load of 50 N was 2.8%. Therefore, it can be seen that the water threads obtained in Examples are superior in stretchability to those obtained in Comparative Examples. The diameter of the water thread obtained in the example was 1.1 mm, and the diameter of the water thread obtained in the comparative example was 0.8 mm. In addition, this diameter is measured by "PEACOCK DIAL THICKNESS GAUGE" manufactured by Ozaki Manufacturing Co., Ltd. Therefore, the water threads obtained in the examples were easier to see than those obtained in the comparative examples.

It is a plane photograph of the water thread (a) obtained in the example and the water thread (b) obtained in the comparative example.

Claims (6)

A water thread for civil engineering work or construction work, which is obtained by twisting a plurality of Taslan processed yarns of synthetic fiber multifilament yarns. A water thread for civil engineering or construction work according to claim 1, wherein the synthetic fiber multifilament thread is a spun-dyed thread. 2. The water thread for civil engineering or construction work according to claim 1, wherein the synthetic fiber is a synthetic fiber selected from the group consisting of polyethylene terephthalate fiber, nylon fiber and polypropylene fiber. preparing a taslan-finished yarn by subjecting a substantially untwisted synthetic multifilament yarn to taslan-finishing;
A water thread for civil engineering or construction work, comprising a step of first twisting a plurality of said Taslan processed yarns after arranging them to obtain a lower twisted yarn, and a step of applying a upper twist after arranging said plurality of lower twisted yarns. manufacturing method. 5. The method of manufacturing a water thread for civil engineering or construction work according to claim 4, wherein the first twist is an S twist and the final twist is a Z twist, or the first twist is a Z twist and the final twist is an S twist. 5. The water thread for civil engineering or construction work according to claim 4, wherein the number of taslan textured yarns in the first twist is 2 to 3, and the number of the first twisted yarn in the first twist is 2 to 3. manufacturing method.

Images