JP2001064866A - Salt shrinking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a salt shrinkage treatment that can shrink silk yarn uniformly. SOLUTION: Silk yarn is brought into contact with a salt shrinkage solution in the form of thread to carry out the salt shrinkage treatment. In a preferred embodiment, the salt shrinkage solution is a calcium nitrate solution with a specific gravity of 1.45-1.50 and the silk yarn is brought into contact with the shrinkage solution at 50-70 deg.C for >=30 minutes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a salt shrinking method.

[0002]

2. Description of the Related Art Conventionally, a cloth woven with silk, such as silk fabric, is immersed in a concentrated solution of a neutral salt such as calcium nitrate, calcium chloride, zinc chloride, and the like, under predetermined processing conditions (a predetermined solution concentration, a predetermined solution concentration, a predetermined concentration). (A solution temperature, a predetermined immersion time), and shrinking a portion using silk is known. In such a conventional method, the specific gravity is generally adjusted to about 1.45. The cloth was put in the prepared calcium nitrate solution, soaked at 85 to 95 ° C. for 0.5 to 2 minutes, and shrunk.

[0003]

However, in such a conventional method, since the fabric is subjected to salt-shrinking processing, the silk yarns are restrained mutually or in various directions by shrinkage during shrinkage. As a result, irregular tension is applied, and therefore, it is particularly difficult to equalize the amount of shrinkage.

[0004] For this reason, the conventional method is suitable for imparting a texture rich in changes such as wrinkles to a woven fabric. It is unsuitable when it is desired to make the conversion.

Accordingly, a main object of the present invention is to make it possible to control shrinkage of a silk thread.

[0006]

According to the present invention, there is provided a salt-shrinking method comprising the steps of: bringing a silk thread into contact with a salt-condensed solution in a state of a non-woven yarn to perform a salt-shrinking treatment. It is. Since silk yarn is processed in the state of yarn that is not woven, it is not necessary to apply irregular tension to silk yarn,
Control of shrinkage can be easily performed.

On the other hand, the inventors of the present invention have found that if salt shrinking of silk yarn in the state of a non-woven yarn is performed in the same manner as salt shrinking in the state of cloth, reproducibility is poor. We know that it is difficult to implement it, and as a result of intensive research on this point, by increasing the specific gravity of the calcium nitrate solution, lowering the solution temperature, and lengthening the immersion time, It was found that the reproducibility was high.

Therefore, in order to more preferably carry out the present invention, the salted solution is a calcium nitrate solution having a specific gravity of 1.45 to 1.50, and the silk thread is heated to 50 to 70 ° C.
It is recommended to contact with the above-mentioned salted solution for 30 minutes or more. Under such conditions, salt shrinking in the state of a yarn can be favorably performed as shown in Examples described later.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, in the present invention,
The silk thread is brought into contact with a salt-condensed solution in the state of a thread, and salt-condensed under a predetermined solution temperature condition and immersion condition.

The salt-condensed solution to be used is not particularly limited, but a calcium nitrate solution is preferred because it is easily available and can have sufficiently high reproducibility.

In practicing the present invention, the specific gravity of the salted solution is preferably from 1.45 to 1.50, and more preferably from 1.48 to 1.50. The temperature of the salted solution is preferably 50 to 70 ° C., and particularly preferably 5 to 70 ° C.
A temperature of 0 to 60 ° C. is preferable because reproducibility becomes very high. Further, the immersion time is preferably 30 minutes or more, particularly preferably 30 to 60 minutes.

Further, the following methods (a) to (c) are proposed as specific examples of the contact treatment between the silk thread and the salted solution in the present invention. (A) The first treatment method is to put a silk thread in a free state into a thermostatic water bath filled with a salted solution, immerse the silk thread at a given solution temperature for a given time, and then wash with de-water and wash the silk thread from the salted solution. This is a method of shrinking the silk thread by washing it with water after taking it out. In the present method, the silk yarn is treated in a non-tension state, that is, in a free state in which the shrinkage is not hindered, and thus there is an advantage that the silk yarn can be shrunk to the maximum. There is also an advantage that the treatment can be performed regardless of the tailoring state of the silk thread.

(B) The second processing method is a method of subjecting a skein-shaped silk thread to salt shrinkage using a jet dyeing machine. Specifically, the skein-shaped silk yarn is put into a jet dyeing machine, and a salted solution at a predetermined temperature is jetted onto the inputted silk yarn for a predetermined time while rotating the shifter. Although the silk yarn of the present method has a skein shape, it is processed in a substantially tensionless state, so that the silk yarn can be shrunk to the same extent as in the first method.

(C) A third processing method is a method of subjecting a silk thread to a cheese-dyeing machine while the silk thread is wound on the wound cheese, and subjecting the silk thread to salt shrinkage. Specifically, raw silk is wound around a cheese, put into a dyeing machine, first scoured, then washed, dehydrated, and dried, and then filled with a salted solution having a predetermined specific gravity into the cheese dyeing machine, and The salted solution is allowed to flow at a solution temperature for a predetermined period of time in the same manner as in the cheese dyeing, and thereafter, deliquored and washed with water. By refining raw silk, sericin on the surface is dissolved by about 25%. When the silk thread in which such surface sericin is dissolved is subjected to salt-shrink processing, the silk thread itself is wound around the cheese, so that the silk thread itself tends to contract and a strong tension is generated,
As a result, the silk thread becomes thinner with shrinkage. On the other hand, since the weight per unit length of the silk yarn increases, according to the present method, an increased amount of processed yarn can be produced by salt shrinking.

<Others> Decoration of a conventional salt-shrink silk fabric by producing a woven fabric using the silk yarn produced by the above-described method of the present invention for only the warp yarn, only the weft yarn, or both the warp yarn and the weft yarn. It is possible to produce a soft and bulky fabric having a different effect.

In the above-mentioned third processing method, tension is generated in the silk thread by the contraction action of the silk thread itself. In the present invention, for example, tension may be mechanically generated in the silk thread by an appropriate pulling means.

[0017]

EXAMPLES On the other hand, Table 1 shows examples of the method of the present invention under various conditions.

[0018]

[Table 1]

From Table 1, it can be seen that the shrinkage ratio is proportional to the processing time. The results also show that the method of the present invention is a processing method with extremely high reproducibility. It can also be seen that those not wound or skeined on cheese, that is, silk yarn in an untailored state, has higher shrinkage. Furthermore, if a silk thread subjected to salt-shrink processing in such a thread state is used, a soft woven fabric having no wrinkle pattern or the like can be manufactured.

[0020]

As described above, according to the present invention, it is possible to uniformly shrink a silk thread.

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Claims (2)

[Claims] 1. A salt-shrinking method comprising: bringing a silk thread into contact with a salt-condensation solution in a state of a non-woven thread to perform a salt-shrink treatment. 2. The salted solution has a specific gravity of 1.45 to 1.50.
Calcium nitrate solution, and the silk yarn is 50 to 7
The contact with the salted solution at 0 ° C. for 30 minutes or more.
The salt shrinking method according to the above.