JPS5812363B2 - Boiled cocoon method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cocoon boiling method, and more specifically,
This invention relates to a cocoon boiling method in which the pressure state of the steaming section is set to a negative pressure state below atmospheric pressure.

In the raw silk manufacturing process, hot water is applied simultaneously to the cocoons before reeling, weakening the bonds between sericin particles in the cocoon layer and causing them to swell and dissolve, reducing the degree of stickiness and making reeling possible. A cocoon boiling machine is used for this purpose.

The raw material cocoon has about 12 parts of anhydrous water in its body even during storage.
The cocoon layer contains less than 11% of the anhydrous amount of water to maintain a dry state, and if the cocoon is placed directly into the boiling cocoon water and boiled, only a portion of the cocoon will come into contact with the boiling water. Uniform boiling is difficult to achieve, so it is necessary to first eliminate the air between the fibers of the cocoon layer, especially within the cocoon cavity, replace it with water, and pass through this water to apply the thermal energy of the boiling water to the sericin of the cocoon layer to soften and swell the cocoon layer. There is.

For this reason, the technical issues in each process within the cocoon boiling machine are as follows:
These include the uniform application of water to the cocoon layer in the cocoon pre-treatment (immersion section, steaming section, permeation section) and complete deaeration of the air inside the cocoon cavity in the steaming section.

If we further consider the problems in preprocessing, the first
As shown in the figure, it is formed of a coarse portion 2 and a dense portion 3, with the dense portion 3 having less water permeability than the coarse portion 2.

Although it is originally the dense part 3 that should absorb water quickly because it is necessary to promote ripeness, in reality it is the opposite and the coarse part 2 gets wet first, resulting in ripening spots.

In the conventionally known cocoon boiling method, as a method for sufficiently absorbing water up to the dense part 3, (a) boiling water is permeated into the entire cocoon layer using highly mixed water at 90 to 95°C.

(b) By extremely lowering the surface tension of water using a penetrating agent, the cocoon layer absorbs water uniformly.

(c) Water is absorbed by changes in air pressure.

One of the three methods has been adopted.

However, when measuring water absorption into the cocoon layer using method (a) above,
This is undesirable because the deaeration of the cocoon cavity 4 in the next steaming section is hindered and the tendency to form floating cocoons increases, and method (b) is not practical because it cannot be expected to be effective unless the drug concentration is considerably increased. In addition, method (C) has a limited water absorption effect.

As described above, none of the conventionally known methods is perfect, and upon further consideration, there is a risk that inappropriate pretreatment may actually increase the size of boiling spots.

Considering the state of the cocoon in the steaming section, in order to measure the water absorption into the cocoon cavity 4 and make it possible to boil the cocoon by sinking, the cocoon must be passed through a chamber temporarily filled with saturated steam, and the air inside the cocoon cavity 4 must be It is necessary to replace the cocoon with steam, and after replacing it with steam, it is necessary to immediately submerge it in hot water below 100°C to complete nearly 100% water absorption.
There are cases where it is desired to avoid contacting the cocoon layer with hot water and complete the cocoon boiling at a temperature below 100°C, for example 98°C or 96°C.

However, in the currently known cocoon boiling machine, the cocoon is soaked in boiling water at 100°C once in order to eliminate the boiling spots during the pretreatment process mentioned above and also to deaerate the air inside the cocoon cavity. This structure forces the cocoons to come into contact with each other.

Therefore, in order to meet these requirements during actual operations, the cocoons are boiled at the lowest possible temperature at which the cocoons do not float.
Temperature control requires a great deal of effort, and incomplete cocooning frequently occurs due to the narrow adjustment range.

The purpose of the present invention is to eliminate such drawbacks of the conventional cocoon boiling method, and the pressure of the steaming section is controlled to a predetermined negative pressure, and the treated water is adjusted according to the adjusted pressure of the section. It is characterized by changing the boiling point and thereby completing the ripening at an appropriate temperature uniformly.In a continuous cocoon boiling method that sequentially passes through at least a pretreatment process, a steaming process, and an adjustment process, the pretreatment process and cocoon grains that have undergone percolation treatment,
The cocoons are passed through a steaming chamber filled with saturated steam and maintained at a predetermined negative pressure below atmospheric pressure, and then immersed in boiled cocoon water at a temperature of less than 100°C in the upper part of a regulating tank that is in close contact with the steaming chamber, in the direction of cocoon grain transfer. The gist of this method is to gradually increase the pressure and boil the cocoons through the boiled cocoon water that reaches atmospheric pressure.

The method of the present invention will be specifically explained below using an example shown in FIG.

First, the configuration of the implementation device will be explained.

In FIG. 2, reference numeral 5 indicates an endless chain to which a plurality of cocoon containers (not shown) are attached at appropriate intervals, and the endless chain 5 travels in the direction of the arrow. The machine is provided with an immersion tank 6 as an immersion section, an catalytic chamber 7 as an evaporation section, a permeation tank 8 as a permeation section, a steaming chamber 9 as a steaming section, and an adjustment tank 10 as an adjustment section.

The immersion tank 6 consists of a hot water tank that stores hot water at about 70°C, and is used to sufficiently immerse the cocoon containers circulated by the endless chain 5, and to seal the steam in the catalytic chamber 7 located next with hot water. The vaporization chamber 7 consists of a steam chamber at approximately 70°C sealed with hot water from the immersion tank 6 and the permeation tank 8. Steam is supplied from the air supply port 11, and excess steam is drained from the immersion tank 6. The drain is discharged to the outside through the water surface, and the drain is discharged to the seepage tank 8 located next.

The seepage tank 8 consists of a water tank that stores warm water at about 70°C,
As mentioned earlier, this structure serves as a steam seal for the vaporization chamber 7.

Therefore, the cocoon boiling machine of the embodiment includes the soaking tank 6, the contact chamber 7,
The seepage tank 8 forms a tank for a pretreatment process before steaming.

Next, the structure around the steaming chamber 9 will be explained. As shown in the figure, the steaming chamber 9 is formed at the top of a closed tank formed in an approximately inverted U shape, and the inlet side of the cocoon container of the closed tank is A water tank with a V-shaped cocoon container traveling path is in close contact with the cocoon container, and an adjustment tank 10 formed in a V-shaped tube body is in close contact with the outlet side.

Thus, the steaming chamber 9 is connected to a known pressure reducing device 12,
By the action of the device 12, the steaming chamber 9 is brought into a negative pressure state below atmospheric pressure, and the steaming chamber 9 has a water tank and an adjustment tank 10.
Hot water for air sealing is stored in each tank, and the open ends of both tanks are open to the atmosphere.

Therefore, the water levels in both tanks become as shown in FIG. 2 depending on the negative pressure state of the steaming chamber 9.

The adjustment tank 10 containing hot water for adjustment is also connected to the steam supply pulp 13, and during operation, the supplied steam brings it into a boiling state, and the steaming chamber 9 located above it is filled with saturated steam. .

The method of the present invention is carried out using an apparatus having the above-described structure, and the cocoons are put into the cocoon container attached to the endless chain 5 at point A in the figure, similar to the known progressive cocoon boiling machine. As the endless chain stored in the cocoon container advances, it passes continuously through the immersion tank 6, the catalytic chamber 7, and the permeation tank 8, is treated at each part and is affected by steam, and enters the cocoon layer as described above. The water is absorbed into the steaming chamber 9 and the adjustment tank 10.

The steaming chamber 9 is maintained at a required negative pressure in advance by a pressure reducing device 12, and the regulating tank 10 is correspondingly boiled at a predetermined boiling point.

The cocoons housed in the cocoon container come into contact with saturated steam in the steaming chamber 9, and the air in the cocoon cavity 4 is replaced with steam, and then immediately enters the adjustment tank 10 containing a predetermined hot water mixture, and then approaches atmospheric pressure. Accordingly, the temperature is gradually lowered to allow hot water to penetrate into the cocoon cavity, and the cocoon comes out to the atmospheric pressure region and is accommodated in the tamahi 14, completing the boiling of the cocoon.

The present invention is carried out in the same way as in the above embodiments, and since the entire process that causes pressure changes during the treatment process is done in hot water, there is no occurrence of boiling spots on the cocoons, and steaming is carried out in saturated steam under negative pressure. This allows the cocoons to be sufficiently exposed to steam.

In addition, since the boiling point of the adjustment tank can be controlled according to a predetermined negative pressure, it is possible to maintain a predetermined temperature, for example, 96°C, even if excess steam is supplied, which corresponds to the original cocoon used. This makes it possible to process the water at a temperature below 100°C, and since the water is immediately introduced into the boiling water from the steaming chamber, which is a saturated steam chamber, almost 100% of the water can be absorbed into the cocoon cavity, and the floating cocoons can be completely removed. can be lost.

Furthermore, since the adjustment tank is tilted, it is easy to create a temperature gradient, which makes it possible to freely control the temperature at which the cocoon comes into contact.

Note that the pretreatment step of this example may be omitted by appropriately setting the treatment temperature and time.

In this case, the water tank adjacent to the steaming chamber serves as the pretreatment tank.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing a longitudinal section of a cocoon, and FIG. 2 is a longitudinal sectional view of only essential parts showing an example of the apparatus used in the present invention. 1...cocoon layer, 2...coarse part, 3...
...Dense part, 4...Cocoon cavity, 5...
・Endless chain, 6... Immersion tank, 7... Touching chamber, 8... Permeation tank, 9... Steaming chamber, 1
0...Adjustment tank, 11...Air supply port, 12
...... Pressure reduction device, 13... Steam supply valve, 14... Ball gutter.

Claims (1)

[Claims] 1 A continuous cocoon boiling method that sequentially passes through at least a pretreatment step, a steaming step, and a conditioning step, in which the cocoon grains that have been soaked and permeated in the pretreatment step are heated to a predetermined temperature filled with saturated steam and at a pressure below atmospheric pressure. The cocoons are passed through a steaming chamber maintained at negative pressure, and then immersed in boiled water of less than 100°C in the upper part of a regulating tank that is in close contact with the steaming chamber, and the pressure is gradually increased in the direction of cocoon grain transfer until it reaches atmospheric pressure. A cocoon boiling method characterized by boiling cocoons through boiling cocoon water.