JPS63203159A - Method for drying and high pressure steam sterilization of fiber product - 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 [Industrial Field of Application] The present invention relates to a method for sterilizing textile products such as cotton, cloth, clothing, and bedding.

[Conventional technology]

For example, absorbent cotton, gauze, bandages used in hospitals and other places,
Cloths, futons, blankets, surgical gowns, etc. are required to be sterile. Sterilization methods are described in the 10th Revised Japanese Pharmacopoeia Manual (19
Although there are various methods as shown in JB 709-B 717 (1986), the following methods are conventionally known as the main methods applicable to the sterilization of cloth as described above.

■ High-pressure steam sterilization method (direct method): A method in which the fabrics to be treated are placed in an autoclave without packaging, sterilized with high-pressure steam, and then taken out into a sterile room and packaged or used as is.

■ High-pressure steam sterilization method (packaging method): A method in which the product is wrapped in paper or cloth that can withstand temperatures of 120°C or higher, which allows steam to pass through but not bacteria, and then sterilizes the product by placing it in an autoclave.

■ Boiling method: Submerge in boiling water and heat (usually 15
Method 0: Sterilization by boiling for more than a minute (boiling for more than a minute) ■ Gas method: Place the cloth in a sterilization pot and first remove the air with a vacuum pump. #1. Inject ethylene gas, raise the pressure to 1/- immediately, hold for 1 hour, then exhaust the gas, introduce air to remove residual gas, and remove with a vacuum pump 5 to 7 times. How to do Shikaeshi.

Other methods include the "dry heat method," which involves heating in dry air, and the "irradiation method," which involves irradiating gamma rays, but the former requires a temperature of 135°C or higher, which causes the fibers to deteriorate, while the latter causes deterioration. This method cannot be used together as the amount of

[Problem that the invention seeks to solve]

By the way, the above methods (1) to (2) have the following problems.

The method of ■ and ■ above is approximately 247m in both cases.
High-pressure steam at about 120℃ is sent into a container that can withstand high pressures (the air inside is pushed out by the steam;
(For method 2, it is more effective to remove the air before adding steam.)

Since the cloth in the autoclave and the autoclave itself are initially at room temperature, all of the contact steam becomes water droplets until the temperature inside the autoclave exceeds 100°C, and the autoclave walls are constantly cooled from the outside atmosphere. Therefore, the steam is constantly cooled on the inner surface of the wall and turns into water droplets, leaving the inside of the can wet. Therefore, methods ① and ③ make it difficult to dry the processed material, and in particular, method ③ causes the wrapping paper to bleed and lose its commercial value.Moreover, it is extremely difficult to dry the cloth that is being packaged. In method (1) and (2), packaging is performed after sterilization, but it is nearly impossible to make the wrapping paper and workers completely sterile, and there is a problem that it is easy to be recontaminated with bacteria during packaging.

The boiling method described in ■ above completely wets the cloth, so even if it can be applied to small-scale cloth used in private hospitals, it cannot be applied to commercial mass production because drying is extremely difficult. It is not possible.

The above gas method (■) has the advantage that it can be sterilized at near room temperature, so there is no risk of deterioration of the packaging material and cloth, and that the sterilizing gas passes through the packaging material well, and there is no need to worry about it getting wet. However, the drawbacks include the high cost of gas, the difficulty of removing residual gas (poisonous gas, which becomes diethylene glycol when dissolved in water), and the danger to workers. There is. In particular, residual toxic gases in products are a serious problem, and it has been revealed that it is difficult to eliminate residual toxic gases no matter how many times the air is washed.

The present invention was developed in view of the above problems.

The aim is to produce textile products that can be sterilized without using toxic gases, without deteriorating the quality of the product, without requiring subsequent drying, and which can be sterilized while still wrapped in breathable wrapping paper that does not cause germs. The object of the present invention is to provide a sterilization method.

Means for Solving Problem C] The dry high-pressure steam sterilization method of the present invention that can achieve the above object is characterized in that when textile products are sterilized using steam at 100°C or higher in an autoclave, From before blowing until the end of sterilization, the fiber products inside and the inner wall of the autoclave can are
00' (7 or more. In other words, the water vapor, the textile product, and the autoclave can wall that come into contact must be kept at a temperature of at least 100°C during the contact. Of course, the temperature must not be raised above the temperature at which the fibers deteriorate.

In addition to its original functions, the autoclave used in the method of the present invention has a structure that can raise and maintain the autoclave can wall to over 100°C, a device to remove air at over 100°C, and other large equipment. It is only necessary to provide a means for raising the temperature inside the autoclave to 100° C. or higher.

Preferably, the inside of the autoclave is heated with a heater, the textile products inside are heated by air heat transfer, and then a vacuum is created, and then saturated steam of 100°C or higher is pumped in. After completion, the steam is poured into the lid of the autoclave. Either open the door and release it all at once, remove it with a vacuum pump, or replace it with high-temperature air to prevent the cooled vapor (steam below 100°C) from coming into contact with the product. [Function] When the above configuration is adopted, the steam comes into contact with an object having a temperature of 100°C or higher, and is not cooled to below 100°C. Therefore, no water droplets are generated in the autoclave and the textiles to be sterilized are not wetted.

〔Example〕

II of the present invention! In order to better understand the high-pressure steam sterilization method for textile products, an example will be given below to explain it in more detail.

First, the dry high-pressure steam sterilizer used in this example will be explained according to the drawings. 1 and 2 are a front view and a side view, respectively, of an autoclave 1t of the sterilizer.

Figure 3 is a sectional view taken along the line - ■ in Figure 1, and Figure 4 is a cross-sectional view of the line 2 in Figure 1.
It is a sectional view taken along the line ■-■ in the figure.

This autoclave 1 has a door 2 on the front for loading and unloading processed products, and the door 2 is a high-pressure air cool door that can be completely sealed so that the interior 3 of the autoclave can be placed at high pressure or vacuum.

This autoclave wall has two walls consisting of an inner wall 4 and an outer wall 5, and high-temperature steam is injected between these walls to raise the temperature of the inner wall 4 to 100° C. or more and maintain it at that temperature. In addition, there is a steam heater 6 and a hot air fan 7 at the rear of the autoclave 3! ! The air and steam inside the autoclave can be heated. This autoclave 1 has a steam introduction pipe and a discharge pipe (
(all not shown) are connected as before, but a vacuum pump is connected to the discharge pipe to rapidly remove air and steam from inside the autoclave. A cooling capacitor 8 is provided as shown in FIG. 5 (front view) and FIG. 6 (cross-sectional view taken along the line ■--■ in FIG. 5). This is to cool the vacuum pump so that it does not directly suck in high-temperature gas. 5 and 6, 9 is an intake port, 10 is an exhaust port, 11 is a water supply port, 12 is a water outlet, 13.13. ,, is a thin tube through which water passes, 1
4 is a partition plate, black arrows (→) indicate the flow of air, and white arrows indicate the flow of cooling water.

Using the equipment f1 as described above, sterilization is performed in the next step.

(1) Raise and maintain the temperature of the inner wall of the autoclave (sterilizer) above 100°C.

(2) Preheat the temperature of the cloth to be sterilized to 100℃ to 120℃.
Raise the temperature to about ℃. (Raise the temperature while there is air.) ゛(3) Make the vacuum state (more than 600Hg) so quickly that the temperature of the cloth inside does not drop.During this time, the inner wall of the pot
Maintain the temperature above ℃ (4) In this state (the temperature of the cloth is close to 100℃ and the inner wall of the pot is about 120℃), send high-pressure steam at 120℃ and keep it for 30 minutes.

(5) After the work is finished, the saturated steam inside will rapidly release steam while the temperature is 120°C, and as soon as the pressure is released, open the lid of the kettle and release the remaining steam. Or send in high i (80°C or higher) air.

In other words, first heat the inner wall of the pot and the items inside the pot to over 100℃, then remove the air inside the pot while keeping the temperature of the inner wall above 100℃ while the temperature of the items inside the pot does not drop. Sterilize by sending high-temperature, high-pressure saturated steam.

If the above sterilization is performed, there is no time for the saturated steam to turn into water droplets, so high-pressure steam sterilization is completed in a dry state, and there is no need to dry it even after taking it out because it is not wet with water.

What has been described above merely shows one embodiment of the present invention, and any modifications and changes may be made without departing from the purpose, structure, and effects of the present invention.

For example, in the autoclave used, the door may be fastened by the Parayoung method, and the autoclave wall may not be a double wall but may have an electric heater wrapped around the outside of the wall. Further, the steam heater inside the autoclave may be provided near the door, and an electric heater may be used instead of the steam heater. Furthermore, in the above embodiment, the temperature of the cloth is raised by stirring the high-temperature air within the autoclave, but the cloth may be heated at a different location and quickly introduced into the autoclave.

〔Effect of the invention〕

According to the dry high-pressure steam sterilization method for tRix products of the present invention, dry sterilization can be performed without wetting the product at all, without using a gas method that causes residual toxic gas or a dry heat method that causes deterioration of fibers. Because I can do it.

Therefore, even if the product is wrapped in air-permeable, non-microbial wrapping paper and then sterilized in that state, the wrapping paper will not become stained with stains or the like, and no drying operation will be required.

That is, the method of the present invention has the effect that highly reliable sterile fiber tag products can be manufactured at low cost and with high productivity.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an autoclave of a sterilizer used in an embodiment of the method of the present invention, and FIG. 2 is a side view of the autoclave. Figure 3 is a cross-sectional view taken along the line -■ in Figure 1, Figure 4 is a cross-sectional view taken along the line ■-■ of Figure 8g2, and Figure 5 is a front view showing the cooling device (condenser) provided in the sterilizer. . FIG. 6 is a sectional view taken along the line ■--■ in FIG. 5. In the figure, 3... Inside the autoclave 4... Inner wall 5...
External wall 6... Steam heater 7... Hot air fan and 2 other people Figure 1 Figure 4 Figure 3 Figure 5 Procedural amendment document March 2G, 1982 Patent Application No. 37305 2, Invention Name of dry high-pressure steam sterilization method for textile products 3 Relationship with the amended person Patent applicant name Suzuran Co., Ltd. 4 Address of agent 65, Kanda Surugadai I, Chiyoda-ku, Tokyo Date of amendment order 6. Subject of amendment 7. Contents of amendment (1) In the ninth line from the bottom of the first page of the specification, "paper" is added after "the present invention relates to". (2) Insert the following sentence between the 7th line from the bottom and the 6th line from the bottom of the 6th page. "The dry high-pressure steam sterilization method of the present invention can be applied to a wide range of AM products, including paper, leather, yarn, cotton, and cloth, including natural fibers (plant fibers, animal fibers, mineral fibers) and chemical fiber(
It can be applied to all kinds of products, from raw materials to intermediate products, to final products and equipment, which contain even a small amount of synthetic fibers, semi-synthetic fibers, recycled Fa male fibers, inorganic fibers, etc. "that's all

Claims (1)

[Claims] When sterilizing textile products in an autoclave using steam at a temperature of 100°C or higher, from before the steam is blown until the end of sterilization, the textile products inside and the inner wall of the autoclave can are
A dry high-pressure steam sterilization method for textile products that is characterized by maintaining the temperature above 0°C.