JPH0314608A - Chrysalis-killing method - Google Patents

Abstract

PURPOSE:To obtain high-quality raw silk by putting cocoons into a bag or container resistant to gaseous transmission followed by encapsulating ethylene oxide gas thereinto and then maintaining the system to enable each farmhouse to make a chrysalis-killing operation simply and conveniently. CONSTITUTION:Cocoons are put into e.g. an aluminum-coated polyethylene bag or a closed vessel made of glass followed by encapsulating pref. a mixed gas of ethylene oxide and carbon dioxide thereinto and then maintaining the system (for ca.2-24hr to prevent fungal growth), thus accomplishing the objective chrysalis-killing practice. It is suggested that, for the chrysalis-killing method, the cocoons firstly put into a bag easily transmitting gases or water vapour (e.g. polyethylene film, paper) followed by putting the bag further into another gas-barrier bag is preferable to carry out the chrysalis-killing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for killing raw silk in a raw silk production process and a method for obtaining high quality raw silk.

[Prior art and problems] When spinning raw silk from raw cocoons, the cocoons of octopuses before they turn into moths are collected and subjected to dry heat treatment to kill pongee and prevent mold. This drying is carried out using an empirical schedule, for example, holding the temperature at 110°C for several hours, then gradually lowering the temperature and holding the temperature at 60"C for a certain period of time. However, the optimal heat treatment schedule for general farmers is This was difficult and the cocoons were collectively processed by a specific organization (dry cocoon plant) after each farmer collected them.
In many cases, the quality of the raw silk obtained was significantly reduced.

[Problems to be Solved by the Invention] In view of the above circumstances, the present invention provides a simple method for killing octopuses that eliminates the intensive cocoon gathering work and allows each farmer to obtain high-quality raw silk at a high yield. The challenge is to provide this.

[A Thousand Steps to Solve the Problems] In order to solve the above problems, the present invention provides the following pongmugi method.

That is, the method for killing pupae according to the present invention is characterized in that the cocoon is placed in a bag or container that is difficult to pass through gas, and the cocoon is sealed and held with ethylene oxide gas. More preferably, it is effective to place the cocoon in a bag that is easily permeable to gas and water vapor, and then to place this bag in a bag or container that is difficult to permeate gas, and to seal in ethylene oxide gas.

Hereinafter, this will be explained in detail by giving a specific example.

In the present invention, ethylene oxide gas is used, but this ethylene oxide gas is not used alone but after being diluted with another gas, and is preferably used as a mixed gas of ethylene oxide gas and carbon dioxide gas (hereinafter referred to as (called dicide gas) is used. As diced gas, ethylene oxide gas is 10% and carbon dioxide gas is 90%.
% (referred to as "Dicecide H10") contains 20% ethylene oxide gas, and 80% carbon dioxide (referred to as "r Dicecide H20") contains 30% ethylene oxide gas.
%, and one containing 70% carbon dioxide gas (referred to as "Dicecide H30"). In addition to ethylene oxide gas and carbon dioxide gas, a mixed gas of ethylene oxide gas and chlorofluorocarbon gas or other gases may be added.

In the killing method of the present invention, cocoons are placed in a bag that is difficult to pass through gas, and die side gas is further sealed to maintain the cocoon in a sealed state. It is preferable that the cocoon is placed in an inner bag that is easily permeable to water vapor, and that the inner bag is placed in the outer bag that is less permeable to gas. Placing the cocoon directly into an outer bag that is difficult for gas and water vapor to permeate and filling it with gas will kill the octopus, but there is a risk that the body fluids of the clam will come out and stain the cocoon, reducing its commercial value. Bags that are easily permeable to gas and water vapor include paper, paper, synthetic resin film, and synthetic resin film. Examples of synthetic resin films include polyethylene films. As the outer bag 3 which is difficult for gas to pass through, it is possible to use, for example, a polyethylene bag whose surface is coated with aluminum. Instead of the outer bag 3, a hermetically sealed container made of glass, metal, etc. can also be used.

The size of the bag may be chosen to be convenient for handling.

Figure 1 shows the state when the die side gas is injected, and the cocoon 1. - Place the air-permeable inner bag 2 containing the gas into the outer bag 3, which is difficult for gas to pass through, and inject diced gas from the gas cylinder 4 into the outer bag 3 via the injection device 5. After injection, the opening of the outer bag is sealed by a sealing device (not shown).

The amount of Dycide gas sealed in the bag is preferably 10-20 ml per cocoon, for example in the case of Dycide H20, but the type and amount of gas is adjusted to the optimal value depending on the situation at that time. do it. Further, the amount of cocoons placed in the inner bag 2 is generally 10 to 15 kg, but is not limited to this. 15m of Daiside H20 per cocoon
If the octopus is sealed, it will die in about 1 hour, but to prevent mold, it is preferable to keep it as it is for 2 to 24 hours.

When the gas-filled outer bag 3 is opened after being kept in a gas-filled state for a predetermined period of time, the clam dries naturally and the cocoon is not contaminated by body fluids. Furthermore, since various germs such as fungi are also killed, the cocoons are not contaminated by mold and can be stored for a long period of time.

According to this method of killing octopuses, since no heat is applied to the cocoons, the unwinding rate is high, and the texture of the cocoon threads is excellent. Furthermore, compared to conventional heating methods, the cocoons are whiter in color, making it possible to obtain high-quality raw silk. Furthermore, since octopus killing and anti-mold treatment can be easily carried out at each sericulture farm, for example, there is no need to gather cocoons all at once at a set time, and there is no need to worry about moths developing during transportation, and the cocoons can be used in remote areas. It also has the advantage of making it possible to raise sericulture, which can greatly contribute to the raw silk production system.

[Example 1] After putting 20 live silkworms in a gas-impermeable bag with external dimensions of 165 x 230 mm and sealing it, Daiside H2
300 ml of 0 was injected with a syringe and kept at 37°C in a thermostatic chamber. Thereafter, the gas inside the bag and cocoon is removed at predetermined intervals.
0 ml was collected with a syringe, and the concentrations of ethylene oxide gas (EO) and carbon dioxide gas (CO,) were examined using a gas chromatograph. The results are shown in Table 1. In addition, it was confirmed that the octopus inside the cocoon that was kept for more than 2 hours was dead.

Table 1 [Example 2] 700 cocoons were placed in an aluminum-coated polyethylene film bag (dimensions 600 x 500 mm), 10.5 ml of Dycide H20 was injected, and the bag was kept sealed for 14 hours, then the bag was opened and the cocoons were removed. I replaced it with a rope bag and stored it. The clam carcasses were clean, the cocoons were white, and no mold was observed even after long-term storage. It should be noted that no moths were observed after at least one hour had elapsed after the gas was filled.

[Example 3] 20 live silkworms were placed in a gas-proof bag with dimensions of 165 x 230 mm,
3 types: L, 1 50ml) and Dieside L (
27% EO. 41% Freon 11, 32% Freon 12
The bag was sealed with a mixed gas (600 ml) containing 600 ml of the bag and stored at 37°C, and the gas inside the bag was collected with a syringe and analyzed using a gas chromatograph. The results are shown in Table 2. In this example as well, it was confirmed that the octopus was dead after 2 hours.

Table 2 [Effects of the Invention] As is clear from the above explanation, according to the method for killing clams according to the present invention, since heat is not applied unlike in the conventional method, the unraveling rate of cocoons is high and the texture is also good. Moreover, because it is white in color, high quality raw silk can be obtained. Another advantage of this pupal killing method is that it can be easily carried out by individual farmers.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the gas filling method. 1...Cocoon 2...Inner bag 3...Outer bag 5 WE1 figure

Claims (2)

[Claims] (1) A pupal killing method characterized by placing cocoons in a gas-permeable bag or container, sealing in ethylene oxide gas, and holding the cocoons. (2) Place the cocoon in an air permeable bag that is easily permeable to gas and water vapor, then place this bag in a bag or container that is difficult to permeate gas, and seal ethylene oxide gas therein to hold it. Characteristic method of killing pupae.