JPS5950762B2 - Manufacturing method of flexible raw silk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing flexible raw silk, and its purpose is to produce extremely flexible silk that retains the original characteristics of cocoon silk, especially the flexibility of cocoon silk. To provide a method for easily producing rich raw silk.

The raw silk currently used is mostly produced using automatic silk reeling machines, but due to the characteristics of automatic silk reeling machines, the silk reeling method requires refinement. Cocoons are boiled under the same boiling conditions as described above and then reeled, but the raw silk obtained in this manner tends to lack flexibility.

The flexibility of the cocoon silk is lost in each process such as boiling, reeling, etc., and the obtained raw silk no longer has that much flexibility.In other words, the flexibility of the cocoon silk is increased. If the flexibility is maintained in the raw silk, it will be possible to further expand the scope of its use as a raw yarn for textiles and knitted fabrics, and it will be even better when used for conventional purposes. In order to obtain a high-quality product, the present inventor conducted extensive research to obtain raw silk with excellent flexibility that retains the flexibility of cocoon silk, and as a result of various experiments, added a translucent dissolving agent. Depending on the boiled cocoon water, use the side where the cocoon was boiled at 80 degrees Celsius or below, wind it up on a reeling frame while applying oiling, then turn it into a large frame to make a string, and bring steam into contact with the cocoon. As a result, it is possible to obtain raw silk with extremely excellent flexibility, that is, raw silk that retains the flexibility of cocoon silk without any loss, and the present invention has been achieved.

The characteristics of the present invention are that the cocoon is boiled at low temperature and the surface produced by this is
It can be said that the method consists of reeling the silk while applying oiling and subjecting the obtained raw silk to catalytic steaming treatment, and these will be explained in more detail below.

First, regarding cocoon boiling at low temperatures, which is one of the features of the present invention, the current reeling operation requires refinement because it is performed using an automatic reeling machine.
For this purpose, it is common to boil the cocoons at a high temperature of about 100°C, tactile steaming, and hot water suction.The cocoon threads are stretched by a slight tensile force due to this high temperature tactile steaming and hot water, and are in a state where they are easily crystallized. This is the property of raw silk after reeling, and is one of the reasons why the obtained raw silk lacks flexibility.

Therefore, it is possible to refine the cocoon without using high temperatures, it will not be stretched by a slight tensile tension, and if the cocoon is boiled in a manner that prevents stretching crystallization, the flexibility will not be impaired.
For this purpose, for example, using boiled cocoon water to which a leaching agent has been added, the boiled cocoon water is heated to temperatures below 80°C, which is the rapid degeneration point of sericin (the inflection point of the temperature-solubility curve of sericin). By boiling the cocoon to a state where it can be refined by absorbing hot water into the cocoon cavity while preventing the denaturation of sericin, the resulting cocoon reeling tension is stretched to the extent of IJ'/cocoon thread. The cocoon can be made into a cocoon that can be prevented from stretching and crystallization without any problems, and the cocoon can be made into a boiled cocoon that can be reeled without any problems such as cracking even with the current automatic reeling machine.

In this case, according to the present invention, the obtained boiled cocoons must be in a state suitable for refining so that they can be reeled by an automatic reeling machine, that is, a certain amount or more of hot water must be absorbed into the cocoon cavity. For this purpose, methods commonly employed in cocoon boiling operations, such as contact vaporization and hot water suction, may be used.

In this case, the temperature of the steam used for contact steaming is 100°C, and even though some denaturation of sericin could theoretically be observed due to the contact with the 100°C steam required for contact steaming, the flexibility of the obtained raw silk could be reduced. In this respect, it is within the scope of the present invention to use steam at 100°C for contact vaporization and hot water absorption for treatments suitable for refinement, since nothing that would affect the degree to which it is a problem has been experimentally observed. be able to.

Also, if we do not choose to use steam at 100°C, it is necessary to maintain the specified temperature of 80°C or less so that the cocoon water reaches a boiling state at that temperature. One of the methods is to suck hot water into the cocoon vagina under reduced pressure.

The boiled cocoons thus obtained are reeled by a reeling machine, and the feature of the present invention is that the reeled yarn is wound while being oiled.

Conventionally, the reeled thread is stretched out and wound around a small frame, and then dried as it is, which creates a strong bond between the four cocoon threads of the raw silk. A stalemate occurs,
This was also a factor in increasing the stiffness of the yarn.

In the present invention, while oiling is applied during reeling, flexibility is imparted to the yarn by preventing adhesion between the yarns and reducing the cohesiveness of the yarns. The oiling agent may be applied to the yarn during reeling before winding the small frame, and if necessary, an oiling agent may be added to the reeling bath.

By applying oiling during reeling in this way, the bonding state of sericin molecules can remain in the same state as the wet state even after removing water, so even if small frame drying is performed, it will not be the same as in conventional reeling. No sticking of the threads due to drying of the small frame was observed.

The oiling agent used for this is usually any oiling agent that can be used for synthetic fibers and yarns, and for example, higher alcohol sulfate esters can be used to prevent sticking and impart flexibility. etc. are used.

The raw silk thread wound around the small frame in this way is turned over to the large frame and made into a piece according to a conventional method. It is characterized by carrying out steaming treatment, and the contact steaming treatment is carried out by bringing steam into contact with the material.

The yarn obtained as described above has a structure in which the tensile force applied during the reeling and spinning processes causes the inside of the yarn to
The fibrils in the amorphous part of the cocoon thread are elongated and built in, but while this elongation is not fixed, by applying both moisture and thermal energy, the degree of adhesion of the sericin that exists between the threads is reduced. Once loosened, the elongation is restored as a characteristic of viscoelastic substances, resulting in macroscopic crimp, resulting in flexible raw silk.

This release of elongation is achieved by simultaneously applying moisture and thermal energy to the raw silk thread.
Hot water immersion treatment is not very preferable because it requires steps such as immersion, dehydration, sieving, drying, etc., which requires complicated labor and long processing time. The process can be completed very simply by simply applying moist heat energy by contacting the material and then leaving the material alone.

This contact steaming process is carried out either by a batch method, in which a certain amount of raw silk is brought into a steam chamber and subjected to contact steaming, or by a continuous method, in which raw silk is allowed to progress continuously in a steam atmosphere. Alternatively, steam may be sprayed onto the hanging string to make it touch and vaporize, and these steps may be performed as desired.

As is clear from the above explanation, one of the features of the present invention is to reduce the degree of conjugation by minimizing the sticking of raw silk threads, and in the present invention, controlling the degree of conjugation with This factor is determined by the degree of denaturation of sericin during boiling cocoons, and the denaturation temperature of sericin, which is approximately 80°C or less, is adopted as the boiling cocoon temperature, thereby producing boiled cocoons that can be refined. By doing this, the sericin is not denatured, and in combination with the application of oiling in the reeling process, it is possible to prevent stretching crystallization without being stretched by a slight tensile tension, and the raw silk does not lose its flexibility. Since it is possible to obtain threads, and the sericin in the raw silk obtained in this way has good solubility, the scouring during the consumption process of raw silk should be done quickly and uniformly. This prevents the appearance of stripes, steps, etc. in textiles, and produces raw silk that can be dyed very well.

As explained in detail above, according to the method of the present invention, the cocoon threads are improved in their crimpability in terms of molecular structure by boiling the cocoons at a low temperature of 80 degrees Celsius or less by boiling the cocoon water to which a translucent disintegrating agent has been added. While retaining sericin, dissolution and denaturation are restricted.
Coupled with oiling during reeling, the degree of adhesion of the raw silk yarn on the small frame is weakened, and after being treated as a material, the bending and elongation of the fibrils in the amorphous part of the cocoon fiber imparted to the yarn are extended by the tactile steaming treatment. The flexibility of cocoon silk is released, has macroscopic crimp, and is extremely flexible.For example, if this is expressed numerically, it is expressed as Young's modulus, and raw silk obtained by a conventional method has a , 000 K97am" ~ 1 t
100 K9/rum2, whereas the raw silk obtained by the present invention is 800 K! 7//″□fi~900
Raw silk with extremely high flexibility, such as Yu/i, can be easily obtained.

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 A 0.5% aqueous solution of osgene (an alkyl aryl ether type nonionic activator) as a percolation dispersing agent was used as boiling cocoon water, the cocoon temperature was 75°C, and the degree of vacuum was 600 MWt/Hg.
Boil the cocoon for 2 minutes for boiling time and 4 minutes for cocoon boiling time, and then coat this side with cord temperature of 75°C, reeling water temperature of 35°C, and reeling speed of 1107°C. ?
, and 7 minutes, the yarn was reeled using a Nissan HR automatic reeling machine in a conventional manner.

The rutting at this time was done within a range that did not cause abnormalities in the sensing state of the fineness sensor (more than once), and the oiling at this time was applied as follows.

A two-stage oiling device with a set of rollers was installed just in front of the small frame, and the roller rotation speed was 2.5 m/min.

The oiling agents used were KCYlol and KCY10.
8 and KOY505 (both are processed emulsified oils using nonionic activators of mixed oils of vegetable oil and sulfated oil).
It is an aqueous solution of

The raw silk yarn thus obtained was turned over in a conventional manner using a Shin-Masuzawa-type turning machine at a frame rotation speed of 180 times/min and an internal temperature of 35° C., and was used as a string.

Live steam (100℃) was sprayed onto this string for 8 minutes, and after steaming,
It was left to dry.

The physical properties of the raw silk thus obtained were as shown in Table 1.

Example 2 Using the same boiled cocoon water as in Example 1 as a percolation dispersing agent, the cocoon was heated for about 50 seconds, which is the necessary time to replace the air in the cocoon cavity with water vapor, using a progressive cocoon cocoon machine. After steaming, 70
Example 1
Table 2 shows the physical properties of raw silk obtained by performing the same reeling, shaking, and catalytic steaming treatments.

As can be seen from these tables, the raw silk obtained by the method of the present invention is extremely flexible compared to conventional silk, as shown by the Young's modulus, and this is, for example, more flexible than the raw silk produced by the method of the present invention. Young's modulus of 700-900 Kl//m-
The value called degree can be said to indicate the same degree of flexibility.

Similarly to Young's modulus, the dynamic elastic modulus is sometimes expressed as an indicator of the flexibility of raw silk, and as shown in the table, the raw silk obtained by the method of the present invention is highly flexible. This is clearly shown.

Furthermore, with regard to strength and elongation, which is an indicator of the suitability of raw silk when using the obtained raw silk as a knitting or weaving material, there is a slight decrease in cutting strength, but this level is of no practical use. Rather, the elongation at break was quite similar, which indicates that the yarn is easy to handle during weaving and knitting, and the covering properties of the resulting woven and knitted fabrics are extremely excellent.

Claims (1)

[Claims] 1 Using boiled cocoon water added with a translucent dispersing agent, the cocoons were boiled at a temperature of 80°C or less, which is suitable for refining, and then wound on a reeling frame while applying oil, and then returned to a large frame. A method for producing flexible raw silk characterized by contacting steam with steam.