JPS59179872A - Drying of washed article in dry cleaner - 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 a method for drying laundry in a dry cleaning machine using organic solvents such as perchlorethylene, /, /, / )lychloroethane, R/13, etc.

To outline the conventional dry cleaning process using FIG. 1 showing a general dry cleaner 2, clothes (1) are first put in through the door (1). When the door (1) is closed and the operation is started, the steps generally proceed in the following order.

■ Pour the solvent <ti> from the solvent tank (3) through the valve (S).
The required amount of solvent ('I) is pumped up by a pump (A) through the treatment tank (/) through a path consisting of a valve (ri) and a filter (g) or a path consisting of a valve (9).

■ Slowly rotate the processing drum (//) and pour the solvent (g) into the processing tank (L), button trap (7, 2), and valve (//).
3), pump' (O), valve (7), fill (g)
,! Or: Clothes are washed by circulation through a circuit consisting of a valve (9).

■ Processing drum (//), button trap (/2)
, valve (/, l), pump (A), valve (/lI
), the solvent is drained through the solvent heating tank (/S), and then the processing drum (l/) rotates at high speed to remove the solvent (') in the clothing.
Centrifuge I) and drain in the same manner.

■ Repeat the steps in section 0 above.

■ The liquid is drained into the solvent tank (3) through the processing tank Cl/), button trap CD), valve (13), and valve (S), and then the processing drum (/l) rotates at high speed to remove the clothing (, 2) Centrifuge and drain the solvent.

■ Slowly turn the processing drum (l/) again and turn on the fan (
/A), air cooler (/7), air heater (ig)
A recovery air duct consisting of l-(/9) and a treatment tank (10
) Air is circulated in the direction of the arrow (Yo) between the clothing (2)
Dry. In addition, the solvent gas evaporated from the clothing (clothes) is condensed in the air cooler (/2), enters the water separator (ayu) via the recovery route (2/), passes through the solvent pipe (U), and then passes through the Tallinn tank (5). λda).

■ When drying is completed, damper (B) (Ω6) opens as shown by the broken line, and fresh air is taken in from the damper, and uncondensed solvent gas that cannot be recovered by the air cooler (/7) is exhausted from damper A). Deodorizes solvent odor in clothing (2).

■ The solvent that entered the solvent heating tank (/left) in the process of item 0 above is evaporated, condensed and recovered in the solvent vapor cooling and recovery section (2?), and then transferred to the water separator (-2) and the solvent piping. [23]′?i
: Enter the Talin tank (2'l) and return to the solvent tank (3) through the overflow partition plate (2g). In addition,
The water separated by the water separator (UNI) is discharged out of the system through the water pipe [29].

Next, the functions and drawbacks of the conventional distiller will be explained using FIG. In conventional distillation equipment, the solvent drained into the solvent heating tank (/S) is heated by a steam heater or an electric heater (3
The vaporized solvent vapor is led to the solvent vapor cooling and recovery section (λ7) through the riser pipe (3Q), where it is cooled by a cooling coil (31) through which cooling water flows. n1 was recovered. Cooling water was discarded after solvent vapor cooling.

However, conventional distillation apparatuses have the following drawbacks. First, in the case of the steam heating method, in addition to the dry cleaner device, steam generation equipment such as a boiler, equipment such as steam piping, drainage equipment for steam drain, etc. are required. Furthermore, in the case of the electric heater heating method, the cost of heating the solvent was high.

Furthermore, since the cooling water is discarded after cooling with solvent vapor, drainage equipment is required and it is uneconomical.

On the other hand, there has been a strong demand for permanent measures against the ring stains that occur on washed clothes during drying.

Therefore, the present invention aims to provide a drying method that is effective in reducing the rate of ring formation using a simple method.In the drying process of a dry cleaner, primary drying is performed at low temperature, followed by secondary drying at high temperature. By performing the next drying, the drying speed unevenness between the surface where the drying speed is the highest, the peripheral area where the drying speed is somewhat smaller, and the inside area is reduced, and the penetration and migration of the residual liquid in the fabric is suppressed as much as possible, and the residual liquid in the fabric is Oil and fat stains are dispersed widely within the fabric without concentrating locally near the surface.
The purpose of this invention is to provide a method for drying laundry.

According to the above method, there is no inferiority in terms of solvent loss, finished texture of the fabric, etc. compared to the conventional hot air drying method, and according to laboratory tests, the rate of ring bleeding is 3 seconds.
Effects such as being able to reduce the loss by about θ% were obtained.

The dry cleaner cleaning method was originally used for high-quality natural clothing such as wool and silk products that are prone to wrinkles and shrinkage after washing, but in recent years, with the diversification of textile products, it has been applied to almost all This applies to clothing made of materials. By the way, dry cleaning uses expensive organic solvents (
Because the cleaning fluid is a petroleum-based, chlorinated, fluorinated solvent, etc., there are restrictions such as having to collect all of it and use it repeatedly. Dry cleaners have their own downsides in terms of quality when cleaning fabrics, such as solvent deterioration, difficulty in rinsing, reverse contamination, and the formation of ring marks.

By the way, the causes of blemish formation can be broadly classified into the following items. First, there is the accumulation and concentration increase of high-boiling point oils, dirt, detergents, etc. in the washing liquid, the lack of residual liquid in the clothes, and the occurrence of dry spots during the drying process.

Of these, the former cause is dependent on user management, such as regular filter inspection and replacement, and proper liquid management, so here we will examine the latter cause from the equipment perspective. . Generally speaking, if we consider dry cleaning and drying of washed clothes, it is similar to the drying process of ordinary solids (paper, plastic film, sheets, etc.), and constant rate drying due to surface evaporation. It is thought that the process proceeds through three stages: , the first stage of reduction rate, and the second stage of reduction rate.

By the way, looking at the drying conditions in practical use, washed clothes are immediately subjected to hot air drying for tQ'Q after dehydrating, and if we consider the drying mechanism in a simplified manner, it is said that the drying process is carried out in a manner similar to the above process.
It is considered that

In other words, the residual liquid evaporates first from the surface where the drying rate is highest, and then the residual liquid permeates and migrates from the inside of the clothing to that surface, and oils, fats, dirt, etc. are locally concentrated near the surface. This causes ring smearing.

Therefore, in the present invention, before directly heating and drying the dehydrated clothing at 10C, /! ;-low temperature drying of aOC for 5 to 7
It is characterized by drying with hot air for 1 minute, followed by hot air drying.The following effects are expected.

That is, according to the present invention, since drying is performed relatively slowly in the initial drying stage where the drying rate is highest, the difference in residual liquid ratio between the evaporation surface, the interior, and the peripheral area is smaller than in the case of 60C drying. Become.

Migration is considerably suppressed, and the organic substances that are the main cause of ring stains, such as oil and fat in the residual liquid, are dispersed over a wide area rather than being locally concentrated only on the surface where the drying rate is high, reducing the proportion of ring stains that appear. It turns out. However, if the drying process is insufficient, there are concerns that it will affect the texture of the finished product, solvent loss, increase in solvent concentration in the waste gas, etc. After low temperature drying for ~7 minutes, normal AOC hot air drying is performed for ~20 minutes to complete drying.

This invention in history? This will be explained in detail using the following specific example.

Example Conditions Using a standard test cloth of OCm square, washing, deliquid, and drying tests were carried out under the following standard conditions, and the degree of ring smearing due to differences in the drying blade θξ was investigated.

(Test conditions) / Standard test cloth (Fabric): (wool cupra) one piece of sewn cloth C size): 10 crr + square - 2 washes Kl: Verchlorethylene K O, 5 Vo 1%
Addition of nonionic surfactant.

3. Dehydration: Use a centrifugal dehydration tank (dehydration tank λ).

l Drying: hot air drying (ZθC hot air x 30 minutes) (conventional method).

■Low humidity drying (/j-10'CX!i~7 minutes), followed by hot air drying (AO'Q hot air X/j'-, 20 minutes) (method of the present invention).

S Cleaning machine: Iwaki KM type vibrator.

Results In this test, the degree of ring bleed formation 1y was evaluated from the size of the stained area.

In the above test, when we compare the smudge production between Otsu OC hot air drying and low humidity drying (locally blown cold air), it is clear that the latter can reduce the smudge area by about 9%. Became. Low-temperature drying has a slower drying speed than hot-air drying, and since it only dries the surface locally, the penetration and migration of residual liquid within the fabric (from the inside and periphery to the surface) is considerably suppressed, and the basis of ring smudges. This is interpreted as a result of the oils and fats in the remaining liquid being dispersed widely over the entire fabric, rather than being locally concentrated on the surface area where it dries quickly.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a conventional dry cleaner, FIG. 2 is a detailed view of the main parts in FIG. 1, and FIG. 3 is a diagram comparing the area of the ring portion of the present invention and the conventional method. 1 person for patent Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] A method for drying laundry in a dry cleaner, characterized in that in the drying process of the dry cleaner, primary drying is performed at a low temperature, followed by secondary drying at a high temperature.