JPS59192739A - Water-proof sewing machine yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction of a waterproof sewing thread, and provides a novel sewing thread that can prevent water from entering through the seams of a workpiece.

Recently, materials that take advantage of their processing characteristics, such as moisture-permeable waterproofing, breathable water-repellent weighting, etc., have been used for various clothing applications, such as raincoats, diapers, sanitary shorts, quilted pants,
It has come to be widely used in skiing, golf wear, etc.

However, when sewing such products, there is a problem of water intrusion or leakage through the seams, and the disadvantage is that the material properties cannot be fully utilized.

This is because water enters through the 31 holes and the sewing thread, and conventional methods to solve this problem include adhesive sewing using high frequency waves and sealing methods that use hot melt resin etc. for the seams after sewing. etc. have been proposed. However, this method has problems with sewing strength and seam hardening.

On the other hand, if the sewing thread itself is subjected to special processing in advance and the resulting effect is expected, for example, a sewing thread coated with a low melting point resin is used as the bobbin thread, and this is heated and sealed after sewing. However, this method has the problem that heat treatment after sewing is time-consuming, and the low melting point resin melts due to the heat generated by high-speed sewing, causing clogging and thread breakage, making it impractical. has not been standardized.

In this respect, the present invention provides a novel sewing thread that has not been seen before, and does not require any post-processing after sewing.
Moreover, the present invention provides a sewing thread suitably suited for high-speed sewing.

However, its characteristic feature is that water-repellent treatment, oil-repellent treatment, wax treatment, and silicon treatment are sequentially applied from the surface of the fiber threads constituting the sewing thread toward the outer layer.

The details will be explained below.

First, the four sewing threads applicable to the present invention include mono- or multifilament yarns made of synthetic m-fibers such as nylon, polyester, and polypropylene, or spun or bulk-processed yarns, and natural fibers include cotton, M4, etc. Synthetic fibers, which are hydrophobic in nature, are particularly preferred.

The threads selected from the above are used to form four threads of sewing thread by conventional methods such as twisting, doubling, and ply twisting, and the following treatments are applied to the threads.

First, water-repellent and oil-repellent treatment; examples of such treatment include treatment with perfluoroalcohol acrylic acid ester or a mixture thereof with silicone (methylpolysiloxane). Such treatment is for imparting dry cleaning resistance with a water repellent effect, and therefore, any treatment agent that satisfies this requirement, that is, a water repellent treatment agent that also has an oil repellent effect, is not limited to those described above.

Next, after such treatment, a wax treatment is performed. The processing agent used for this is hydrocarbon resin, or this and special silicone (modified dimethylpolysiloxane).
, a mixture of dimethylpolysiloxane, paraffin wax, and microcrystal wax may be used alone or in combination. In this process, the above-mentioned processing agent is filled into the hole created by the needle movement to seal the seams. Therefore, it has a certain degree of viscosity and may stick to the seams or cause heat generation due to the needle movement. It is required to have the property of melting and covering the seams.

Next, after such treatment, silicon treatment is performed. The processing agent used for this purpose is medium to high viscosity dimethylpolysiloxane, specifically, a viscosity of 1000 at 25°C.
Dimethylpolysiloxane having a centistoke or higher is preferable, and this treatment improves the appearance and imparts smoothness, and also covers the surface viscosity caused by the wax treatment and thereby prevents tanking.

The sewing thread of the present invention having the following two structures enables high-speed sewing due to the smoothness of the silicone formed in the outermost layer, and has the advantage of being easy to handle due to its improved surface viscosity. In addition, at the seams formed by stitching, the wax is exposed beyond the thinned silicone layer, and its viscosity and melting block the needle holes, thereby preventing water leakage and infiltration. Furthermore, since the thread itself has water and oil repellency of +1-1, it prevents water from penetrating through the sewing thread.
It can prevent water leakage, and since it has oil repellency, it has a dry-like 1 noning effect and can maintain this effect forever.

As described above, in the present invention, each treatment layer is combined with an organic layer to exhibit excellent effects that have not been seen before.

This will be explained below by giving examples.

<Example 1> Polyester processed yarn obtained by false twisting (100 d/
After dyeing 1X3), 0.5% by weight of Noguichi fluoroalcohol acrylic acid ester was applied and dried at 1oo0c for 10 hours. Next←This/\ A molten mixture of idylocarbon resin and modified silicone was applied to a size of 20% by weight using the roller-taper method and dried at 15°C for 5 minutes. The viscosity at 25°C is 1
The sewing thread of the present invention was obtained by immersing it in a dimethylpolysiloxane melt of 0.000 centistokes and treating it so that the coating amount was 2% by weight. When the thus obtained sewing thread of the present invention was used as a bobbin thread for a sewing machine, it exhibited excellent waterproof properties as shown in Table 1.

Table 1 The evaluation was carried out using the following method.

Seam water resistance test: JIS L-1092 Low water usage Sewing conditions Sewing machine: Lockstitch sewing machine Brother DB2-8757-33t
: DBJll Rotation %: 4000r, p,
M fabric: Waterproof 41, Endrant E 2000 Parking pitch = 12 stitches/3cm Number of stacks: 2 pieces Senshi thread: #50 polyester filament sewing thread with water repellent treatment Control group is polyester woolly sewing thread obtained by false twisting This is when (+00d/1me3) is used.

In addition, the illustrated drawing is made using the sewing thread obtained in this example.
These are enlarged photographs of the stitches when they were made, with Figure 1 using the sewing thread of the present invention and Figure 2 using the control thread. As is clear from this figure, it can be seen that the sewing thread of the present invention is suitably sealed with the treatment agent.

<Example 2> After dyeing a 50 count polyester spun sewing thread, 0.3% by weight of a mixture of barfluoroalcohol acrylic butyester and silicone was applied and dried at 100°C for 10 hours. Next, a mixture of paraffin wax and microcrystal wax was melted and soaked in it for 5 minutes.
0% by weight deposit and dry for 10 minutes at 20°C. Next, dimethylpolysiloxane having a viscosity of 10,000 centistokes at 25 DEG C. was treated by a roller touch method so that the coating amount was 1% by weight to obtain a sewing thread of the present invention. When the thus obtained sewing thread of the present invention was used as a lower thread of a sewing machine, it exhibited excellent waterproof properties as shown in Table 2.

Table 2 The evaluation was carried out in accordance with Example 1, except that #50/3 polyester spun sewing thread, which had been treated with water repellency, was used as the side thread.

Further, dry cleaning is an evaluation after performing petroleum dry cleaning three times.

In addition, control area 1 uses #50/3 polyester spun sewing thread that has been treated with water repellent, and control area 2 uses #50/3 polyester spun sewing thread that has been waxed. .

As described above, the present invention exhibits excellent effects by itself without any post-sewing treatment, and is particularly effective when used as a bobbin thread for sewing machines. In the structure of the present invention, it is desirable that the three layers are processed completely separately, but it is acceptable for the processing layers to be mixed to some extent.

[Brief explanation of drawings]

Figure 1 is an enlarged photograph of a seam formed using the sewing thread of the present invention obtained in Example 1, and Figure 2 is an enlarged photograph of a seam formed using the same control section. It is. Procedural amendment (voluntary) 1. Description of the case 1982 Patent Application No. 64297 2 Name of the invention Waterproof Sewing Thread 3 Relationship with the person making the supplement I Patent applicant Address 1 Zeze, Aono-cho, Ayabe-shi, Kyoto Name ( 13
3) Gunze Co., Ltd. 4, Subject of amendment 5, Contents of amendment (1) On page 2 of the specification section, lines 12 to 15, it says, "It has not been put into practical use due to problems that require time and problems that ..." is corrected to ``It is time-consuming and has not been put into practical use due to problems.'' (2) "Drying" on page 6, line 5 and page 8, line 5, respectively.
Correct the statement to "air dry." (3) On page 6, lines 6 to 7, the phrase ``dipped in a dimethylpolysiloxane melt'' is corrected to ``dimethylpolysiloxane by the roller tanch method.'' (4) On page 7, line 5, "Endrant E 2000J" is corrected to "Endrant 2000J."

Claims (1)

[Claims] Water-repellent, oil-repellent, wax, and silicone treatments are applied to the outer layer of the fiber threads constituting the sewing thread.
A waterproof sewing thread characterized by: