JPH023760Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for measuring the number of bacteria attached to packaging materials, and its purpose is to measure the number of bacteria attached to packaging materials with high accuracy. The purpose is to perform large quantities with simple operations.

Recently, with the advancement and diversification of packaging technology, attention has been paid to the cleanliness and sterilization of packaging materials, and both packaging material suppliers and users are
Furthermore, users of packaging products have also become aware of, or are concerned about, the cleanliness and sterility of the packaging materials used.

However, the conventional method for measuring the number of bacteria adhering to packaging materials has been to wash away the bacteria adhering to the packaging materials with sterile water and pass it through a membrane filter, but this method is difficult to operate. It is complicated, requires advanced aseptic technique, and has problems such as the inability to wash out 100% of attached bacteria.

The present invention has been devised in view of these points.

In other words, the aim is to culture and measure adherent bacteria on packaging materials using a method that is completely different from the method of filtering adherent bacteria that has been washed away from packaging materials. , a bottom plate on which the packaging material is placed, a surrounding frame made of an elastic material placed on the bottom plate, and a holding plate provided with a protruding frame into which the surrounding frame fits in order to press the surrounding frame against the bottom plate;
It consists of a lid that fits into the protruding frame of this presser plate.

The configuration of the drawings will be specifically explained below.

A is a strong bottom plate made of metal, hard synthetic resin, etc., with stud bolts 1 at its four corners, and a through hole 2 bored in the center.

B is a surrounding frame made of a thick elastic material such as silicone rubber. C is a holding plate made of the same metal, hard synthetic resin, etc. as the bottom plate A for holding down the surrounding frame B against the bottom plate A; A protruding frame 5 having a presser edge 4 for holding down the plate body 3 is provided in a protruding manner, and through holes 6 are provided at the four corners of the plate body 3 to allow the stud bolts 1 of the bottom plate A to be inserted therethrough. D is a lid molded from metal, synthetic resin, glass, etc., which fits into the protruding frame 5 of the presser plate C. Transparent synthetic resin, glass, etc. are preferable in order to observe the internal state.

Although the surrounding frame B is rectangular in the illustrated example, it may be square, triangular, or circular.

In addition, a thumbscrew 7 is required which is screwed into the stud 1 for pressing the presser plate C onto the bottom plate A.

The measuring instrument of the present invention is sterilized by steam sterilization, ethylene oxide gas sterilization, gamma ray sterilization, etc. before use.

First, the packaging material a to be measured is placed on the bottom plate A, and the surrounding frame B is placed on top of the placed packaging material a to prevent it from coming off.

Next, insert the through holes 6 at the four corners of the holding plate C into the holes 6 at the four corners of the bottom plate A.
The presser edge 4 presses the surrounding frame B by inserting it into the corner stud 1, fitting the protruding frame 5 into the surrounding frame B, and screwing and tightening the wing screw 7 onto the stud bolt 1. Then, this is brought into close contact with the packaging material a, and the bottom plate A, the packaging material a, the surrounding frame B, and the presser plate C are integrated.

A culture medium is poured into the integrated surrounding frame B, a lid D is fitted to the protruding frame 5, and culture is performed.

After culturing, counting the number of colonies that have developed on the culture medium is the number of bacteria that have adhered to the packaging material.

Of course, the culture medium should be selected depending on the bacterial species to be measured.

Additionally, if the packaging material to be measured is a thin film-like material, when film a is placed on bottom plate A, some air remains between it and bottom plate A. When the culture medium is poured into the surrounding frame B, it expands and the film swells up, but the expanding air is released through a through hole 2 formed in the bottom plate A to prevent the harmful effects thereof.

As explained above, the measuring device of the present invention is assembled together with the packaging material to which the bacteria to be measured are attached, so it is important to choose a packaging material that is wider than the surrounding frame, regardless of the thickness of the packaging material. Therefore, highly accurate measurements can be easily performed in large quantities without any other equipment touching the part of the packaging material to be measured.

[Brief explanation of the drawing]

The drawings show the measuring instrument of the present invention; FIG. 1 is a perspective view, FIG. 2 is a sectional view, and FIG. 3 is an exploded perspective view. A... Bottom plate, B... Surrounding frame, C... Holding plate, D...
...lid, a...packaging material, 2...through hole, 4...presser edge, 5...projection frame.

Claims (1)

[Scope of utility model registration request] A bottom plate on which the packaging material is placed, a surrounding frame made of elastic material placed on the bottom plate, a holding plate provided with a protruding frame that fits into the surrounding frame in order to press the surrounding frame against the bottom plate, and this holding plate. An instrument for measuring the number of bacteria adhering to packaging materials, consisting of a lid that fits into a protruding frame of a holding plate.