JPS6036290Y2 - sterilization bag - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sterilization bag with excellent heat-sealability. The present invention relates to a sterilization bag that can be easily heat-sealed.

Sterilization bags are used to sterilize medical equipment, etc., but conventional sterilization bags use specially made paper called sterilization paper, which has excellent sterilization suitability and protection against bacterial contamination. Met.

Note that, in practice, a bag with one side made of a transparent plastic film is used so that the items to be sterilized housed in the bag can be easily identified from the outside.

Plastic films used in such products are generally dry-laminated biaxially stretched polyester films and cast polypropylene.

A biaxially stretched polyamide film may be used instead of the biaxially stretched polyester film.

In any case, the plastic used for such items must be able to withstand steam sterilization, e.g.
It is necessary to withstand the heat steam treatment of two powders at C and one powder at 135°C.

However, when making bags using conventional plastic film laminates and sterilized paper, for example, when making bags by overlapping identical rectangular pieces and heat-sealing the periphery, heat is required. It had the disadvantage of being difficult to form a strong seal.

One solution to this problem was to use a blend of short polypropylene fibers with pulp when making sterilized paper.

The blending ratio of short polypropylene fibers is 5 to 3.
It has been thought that 0%, preferably around 15% is good.

However, such highly specialized paper has the drawbacks of high cost and unsuitability for gravure printing.

The purpose of the present invention is to eliminate the drawbacks of the prior art as described above.
To provide a sterilization bag which can be made of ordinary sterilization paper and has good heat sealability.

The sterilization bag according to the present invention for the above purpose has a laminate on one side having a modified polypropylene layer laminated on a layer of ordinary sterile paper, and the modified polypropylene layer has a large number of perforations on the entire surface. The laminate on the other side has a polypropylene layer, an ethylene-polypropylene copolymer layer, or a modified polypropylene layer laminated on a heat-resistant resin layer. The paper layer of the laminate on one side and the heat-resistant resin layer of the laminate on the other side are overlapped on the outside, and the periphery is heat-sealed to form a bag shape. Modified polypropylene is modified polypropylene modified with an unsaturated carboxylic acid or its anhydride.

According to the present invention constructed in this way, a sterilization bag with good heat-sealability can be obtained using ordinary sterilization paper.

The modified polypropylene mentioned above can be used as a polypropylene that is already commercially available, Mitsui Petrochemical Co., Ltd.
ADMER 1, Sumitomo Chemical ■ rBON
DFAST G type, Mitsubishi Yuka Co., Ltd.'s "MODICP"
-40D, P-30FJ, etc. can be listed.

In the above, the laminate on one side is made by laminating a layer of polypropylene or polypropylene added with inorganic substance powder on top of the modified polypropylene layer laminated on the paper, and has many small holes penetrating the layer other than the paper over the entire surface. It may also be made by being perforated.

As this inorganic substance powder, calcium carbonate powder, silica powder, etc. can be used.

When a layer of polypropylene containing 10 to 20% by weight of these powders is added, the releasability of the heat-sealed portion is excellent.

As the heat-resistant resin layer in the laminate on the other side in the above, a polyester layer or a stretched nylon layer can be mentioned.

The small holes mentioned above preferably have a diameter of 1 to 3 mm.

In manufacturing the above-mentioned sterilization bag according to the present invention, a film made of a single layer of modified polypropylene or a film made of two layers, a layer of polypropylene and a layer of modified polypropylene, is prepared, and a large number of small holes are pre-filled on the entire surface. One side of the laminate can be obtained by making perforations, bringing the modified polypropylene layer into contact with the sterile paper, and heat-sealing the modified polypropylene layer by a conventionally known method.

In this way, by making a film on sterilized paper with many small holes, it is possible to make it easier for the air inside the bag to escape through the paper when sterilizing the stored items. This allows high-temperature steam or sterilizing gas to easily enter the bag, thereby promoting the sterilization effect.

In addition, by making the film laminated on the sterilized paper into two layers, one made of modified polypropylene and one made of ordinary polypropylene, the amount of expensive modified polypropylene required can be reduced, and the cost can be reduced.

The present invention will be described in detail below with reference to the drawings.

Example I In general, polypropylene and Atmer QE-305 from Mitsui Petrochemical Co., Ltd. (Kiku) as a modified polypropylene were coated in two layers by inflation to form a rolled raw fabric.

A large number of small through holes were made in this original fabric using a processing machine with heated needles set at required intervals, and the fabric was wound up.

This roll and Kraft sterilized paper 60g/ly1'' (manufactured by Tokai Pulp ■) were heat-sealed by passing through a heating roller so that the modified polypropylene layer adhered to the sterilized paper.

In this way, on the sterilized paper 1 as shown in the enlarged plan view in FIG. 1 and in the sectional view taken along the line
A laminate 6 was obtained, which was composed of a modified polypropylene layer 2 and a polypropylene layer 3, and in which a large number of small holes 10 were bored through the modified polypropylene layer 2 and the polypropylene layer 3.

As the laminate on the other side, a 12 μm thick polyester resin, which is a heat-resistant resin, and a 30 μm thick layer of general polypropylene resin were bonded together using a urethane dry laminating adhesive to form a film.

A bag for sterilization was produced by making a bag using a bag making machine so that the sterilized paper of the laminate on one side and the polyester layer of the laminate on the other side were on the outside.

The fabricated product had a seal width of 10, a bag width of 10h, and a bag length of 200rrvn.

Gauze for the object to be sterilized was placed in this bag and sealed.

This is shown in the plan view of FIG. 3, the sectional view taken along line IV--IV of FIG. 4 of FIG. 3, and the enlarged view of section A of FIG. 4 of FIG.

In these drawings, a laminate 6 on one side containing the sterilized paper 1 and a laminate 7 on the other side are laminated with a polyester layer 4 and a general polypropylene layer 5, and are heat-sealed at a sealing part 8. The gauze 9, which is the object to be sterilized, is housed in the bag.

The adhesive strength of the modified polypropylene to the sterilized paper in the sterilization bag of this example constructed in this manner was strong, and as a result of a strength test, it was found to be at the level of peeling the paper.

In addition, the adhesive strength of conventional products made by heat-sealing general polypropylene and paper was only 2009/15771771.

This comparison shows how strongly the modified polypropylene layer in this example adheres to the sterile paper.

Furthermore, when the gauze 9 was housed and sealed in this sterilization bag and steam sterilized at 135°C for 159 days, no peeling of the seal was observed, and the results were good in all respects. .

Furthermore, when the same treatment was applied to a product containing surgical scissors instead of gauze, no phenomena such as bag breakage were observed, and there was no peeling of the seal, resulting in good results.

Furthermore, the releasability of the heat-sealed portion between both laminates was moderate, and it was confirmed that it was effective against paper peeling.

Example ■Produced in exactly the same manner as Example ■, except that the modified polypropylene layer used in Example I was replaced with an inflation film made by Mitsui Petrochemicals (Kiki's Atmer QE-300, thickness 50μ). did.

Just as in Example I, in both cases, when the gauze was sterilized and when the surgical scissors were sterilized, no bag breakage or seal peeling was observed, and the results were very good.

Furthermore, it was confirmed that the peelability of the heat-sealed portion between both laminates was moderate, and that it was also effective against paper peeling.

The above example is an example in which two layers, a layer of modified polypropylene and a layer of general polypropylene, are laminated on sterilized paper, but the same effect can be obtained even if only one layer of modified polypropylene is provided. Admitted.

As explained above, according to the present invention, a sterilization bag with extremely excellent performance can be obtained using ordinary sterilization paper.
The effect is extremely large.

[Brief explanation of drawings]

Figure 1 is a plan view of a laminate made of sterile paper laminated with two layers of modified polypropylene and regular polypropylene, which was used in an embodiment of the present invention, and Figure 2 is the line shown in Figure 1 -
Fig. 3 is a plan view of a sterilization bag containing gauze, which is an embodiment of the present invention, made using the laminate shown in Figs. 1 and 2; Fig. 4 is the line TV in Figure 3.
5 is an enlarged view of section A in FIG. 4. 1... Sterile paper, 2... Modified polypropylene layer, 3, 5... General polypropylene layer,
4... Polyester layer, 6... Laminate on one side, 7... Laminate on the other side, 8...
... Seal part, 9 ... Gauze, 10 ...
...Small hole.

Claims (2)

[Scope of utility model registration request] (1) The laminate on one side has a modified polypropylene layer laminated on a paper layer, and the modified polypropylene layer has a large number of through holes perforated over the entire surface; The laminate has a polypropylene layer, an ethylene-polypropylene copolymer layer, or a modified polypropylene layer laminated on a heat-resistant resin layer, and the paper layer of the laminate on one side and the other side In the laminate, the heat-resistant resin layer is placed on the outside, and the periphery is heat-sealed to form a bag shape. Sterilization bag made of polypropylene. (2) On the modified polypropylene layer of the laminated layer on one side, there is further added polypropylene or inorganic material with small holes drilled in the extending direction of the small holes drilled in the modified polypropylene layer. The sterilization bag according to claim 1, which is made of laminated layers made of polypropylene.