JPH10267826A - Jig for measuring permeability of gas in container and measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring jig in which two pipes can be connected air-tightly to a permeability measuring device inside a paper container to be measured in gas permeability. SOLUTION: A projected part 11 is formed on the container fitting side of a container fitting plate 4A to which two pipes 5 and 6 are penetrated and secured, so as to be engaged with an opening 14 formed on a paper container 14. Then an adhesive agent 15 is applied to the outer periphery of the projected part 11 and the opening 14 and they are engaged with each other, thereby connecting the opening 14 of the container 13 to the plate 4A air-tightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas permeability measuring jig used for connecting a container and a gas permeability measuring instrument when measuring gas permeability, for example, oxygen permeability of a container. The present invention also relates to a measuring method for measuring gas permeability of a paper container using the same.

[0002]

2. Description of the Related Art It is important to measure the oxygen permeability of a container such as a plastic container or a paper container. Conventionally, as a device for this purpose, as shown in FIG. The container 2 to be measured is placed in the gas permeability measuring device 1
A jig 3 for measuring gas permeability is used for connection to the apparatus. The gas permeability measuring jig 3 includes a container mounting plate 4 having a flat surface for mounting a mouth of the container 2, and two pipes 5 and 6 fixed through the container mounting plate 4. ing. At the time of measuring the oxygen permeability of the container, as shown in FIG.
Are bonded and fixed in a state where the insertion portions 5a and 6a at one ends of the pipes 5 and 6 are inserted into the container 2, and the attachment portions 5b and 6b at the other ends of the pipes 5 and 6 are attached to the gas permeability measuring device 1. Connected to the gas supply port 7 and the gas intake port 8 by the connecting tool 9, and in this state,
The gas permeability measuring instrument 1 supplies a carrier gas, for example, nitrogen gas into the container 2 from the gas supply port 7, takes in the gas in the container 2 from the gas inlet 8, and measures the oxygen concentration in the gas. The transmittance was measured. Further, there is also known a jig in which the attachment portions of the pipes 5 and 6 of the measuring jig 3 are spirally formed to have flexibility to facilitate connection to a gas supply port and a gas inlet of a gas permeability measuring instrument. (Actual fairness 4-
No. 54444).

On the other hand, since the paper container does not have a port which can be pressed against and fixed to the container mounting plate 4 like the container 2, the oxygen permeability was measured by the following method. The paper container is cut horizontally at the trunk and divided into an upper part and a lower part. The cut is pressed against the container mounting plate 4 shown in FIG. Measurement, and the measured values are summed to obtain the oxygen permeability per container. An opening for measurement is formed in a side portion of the paper container, and the surface on which the opening is formed is pressed against the container mounting plate 4 so that the pipes 5 and 6 shown in FIG. Then, the oxygen permeability is measured in that state. For paper containers with spouts, open the spouts,
A pipe for measurement is inserted from that part, sealed by a suitable means, and the oxygen permeability is measured in this state.

[0004]

However, in the conventional gas permeability measuring jig shown in FIG. 7, the portion of the container mounting plate to which the container opening is pressed and adhered is simply a flat surface. There has been a problem that a gap is formed between the container and the container mounting plate, so that leakage easily occurs and a measurement error is large.

In particular, when measuring a paper container, as described above, when the paper container is cut horizontally at the body and the upper and lower cuts are pressed against the container mounting plate and bonded, the cut is made. Since it is not necessarily flat, gaps are likely to occur,
Also, as described in, when a measurement opening is formed in a side portion of the paper container and the opening is pressed against the container mounting plate, the side portion does not always hold a flat surface. Because there is no, it is easy to produce parts that do not adhere to the container mounting plate,
Due to these reasons, the leakage was large and the measurement accuracy was extremely poor.

In the method for measuring the paper container described above, the oxygen permeability is measured while the spout is opened, so that the oxygen permeability of the spout is ignored. However, there is a problem that the oxygen permeability cannot be measured in the entire paper container including the above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a gas permeability measuring jig having a structure capable of mounting a container opening so that leakage hardly occurs. I do. Another object of the present invention is to provide a method for measuring the gas permeability of a paper container, which makes it possible to accurately measure the oxygen permeability of the paper container.

[0008]

SUMMARY OF THE INVENTION A gas permeability measuring jig of the present invention is inserted into a container mounting side of a container mounting plate and into the container in order to ensure adhesion and fixation of a container opening to a container mounting plate. A tubular projection that can be fitted into the opening of the container at a position surrounding the two pipes to be formed, and a configuration in which the two are adhered in a state where the opening of the container is fitted to the projection. It was done. By utilizing the fitting of the projection and the container opening in this manner, even if the peripheral portion of the container opening does not adhere to the flat portion of the container mounting plate, the gap between the projection and the container opening is provided with an adhesive. The container can be reliably sealed, and can accurately measure the gas permeability of the container such as oxygen.

Further, according to the paper container measuring method of the present invention, an opening is provided on the side surface of the paper container so that the cylindrical projection of the above-described gas permeability measuring jig can be fitted therein. Fit the projections and fix the fittings with adhesive,
It is characterized in that the gas permeability of the paper container is measured. As described above, by measuring the oxygen permeability using the opening formed on the side surface of the paper container, the oxygen permeability of the entire paper container including the spout can be measured at a time, and at this time, the projection is provided. By using the gas permeability measuring jig, the paper container can be attached to the gas permeability measuring jig in a leak-free state, and the gas permeability such as oxygen of the paper container can be accurately measured. .

[0010]

FIG. 1 is a schematic side view of a gas permeability measuring jig according to an embodiment of the present invention, and FIG. 2 is a schematic plan view thereof. The gas permeability measuring jig 3A of the present embodiment also includes a container mounting plate 4A and two pipes 5, 6 fixedly penetrating the container mounting plate 4A, similarly to the conventional case. One end of each of 5, 6 has an insertion portion 5a inserted into the container,
6a, and the other ends are mounting portions 5b and 6b that can be detachably connected to the gas supply port and the gas intake port of the gas permeability measuring instrument by the connecting tool 9, respectively. The attachment portions of the pipes 5 and 6 are not limited to the linear shape shown in the figure, but may have a helical flexibility to easily connect the gas permeability measuring device to the gas supply port and the gas intake port. It may be.

Unlike the conventional case, the container mounting plate 4A has a cylindrical projection 11 on the surface on the container mounting side, which can be fitted into the opening of the container. Since the container opening is usually circular,
The shape of the projection 11 is determined to be circular as can be clearly seen from FIG. 2. However, if the projection 11 is used for a container having a non-circular opening, the planar shape of the projection 11 naturally has the non-circular opening. Determine the shape according to. The height of the protrusion 11 is preferably 3 mm or more, more preferably 5 mm or more, in order to fit the opening of the container so that it can be easily and reliably fixed with an adhesive. The size of the projection 11 is adjusted to the size of the opening of the container. However, as described later, when an opening for measurement is formed on the side surface of the paper container, the diameter of the protrusion 11 should be 2 cm or more. preferable.

Next, a method of measuring the oxygen permeability of the paper container 13 shown in FIG. 3 using the gas permeability measuring jig 4A will be described. First, an opening 14 for measurement is opened in a side surface portion (a portion avoiding a bonded portion or the like) which does not affect oxygen permeability in the entire paper container 13. The size of the opening 14 is determined so that the protrusion 11 of the container mounting plate 4A can be fitted well. Next, as shown in FIG. 4A, an adhesive 15 is applied to the inner surface and the periphery of the opening 14 on the side surface of the paper container 13, and the outer peripheral surface of the protrusion 11 of the container mounting plate 4A and the vicinity of the same. The adhesive 15 is also applied to the container mounting plate 4A, and then, as shown in FIG.
The protrusions 11 are fitted into the openings 14 of the base material, and the fitted portions are fixed with an adhesive 15. At this time, if the side of the paper container 13 where the opening 14 is formed is recessed, the side of the paper container 13 may not contact the container mounting plate 4A even if the paper container 13 is pressed against the container mounting plate 4A. The protrusion 11 is fitted into the opening 14, and the outer periphery of the protrusion 11 is
In order to adhere and fix at 5, the opening 14 and the protruding portion 11 are securely adhered over the entire circumference and without leakage. As the adhesive used here, an epoxy adhesive, a silicon adhesive, or the like can be used.

As shown in FIG. 4B, the container mounting plate 4A
After the paper container 13 is attached to the pipe, the pipes 5 and 6 are connected to a gas permeability measuring device (for example, OX-TRAN, an oxygen permeation detector, a zirconia type oxygen detector, etc.).
And the oxygen permeability of the paper container 3 is measured. As described above, the oxygen permeability of the entire paper container 13 (or the entire paper container including the spout when the spout is provided) can be accurately measured at once.

[0014]

【Example】

Example 1 1000 ml Goebel top type liquid paper container (laminated structure of container material: PE 30 μ / paper 400 g / m ² / E)
An opening having a diameter of 3 cm is opened by a circular cutter in a portion of the side surface of MAA25μ / Al7μ / DL / PE60μ) excluding the bonded portion. A measuring jig 3A having a cylindrical projection 11 having a diameter of 3 cm and a height of 8 mm provided on a container mounting plate 4A of 10 × 10 cm and having the shape shown in FIGS. 1 and 2 is prepared. Then, a two-component mixture-curable epoxy-based adhesive is applied to the surface of the container mounting plate 4A and the vicinity of the opening of the paper container in the vicinity thereof. The projection 11 of the measuring jig 3A is fitted into the opening of the paper container and adhered well. Cure for 12 hours or more, then attach to a gas permeability measuring device (OX-TRAN manufactured by Modern Control), 23 ° C, humidity, 40% outside the container, 90% inside the container
The oxygen permeability was measured under the following conditions. Table 1 shows the results.

[Example 2] 1000 ml capacity goebel top type liquid paper container (laminated structure of container material: PE 30μ / paper 400 g / m ² / P
E50μ / Silica-deposited PET12μ / DL / PE60
An opening having a diameter of 2 cm is opened with a circular cutter in a portion except for the bonded portion on the side of μ). 1 and 2, a cylindrical projection 11 having a diameter of 2 cm and a height of 5 mm is attached to a container mounting plate 4A of 8 × 8 cm.
Is prepared, and a silicone-based adhesive is applied to the outer periphery of the projection 11 and the surface of the container mounting plate 4A in the vicinity thereof and the periphery of the opening of the paper container. The projection 11 of the measuring jig 3A is fitted into the opening of the paper container and adhered well. Cure for 12 hours or more, then attach to a gas permeability measuring device (OX-TRAN manufactured by Modern Control), 23 ° C, humidity, 40% outside the container, 90% inside the container
The oxygen permeability was measured under the following conditions. Table 1 shows the results.

Comparative Example 1 Oxygen permeability measurement was performed under the same conditions as in Example 1 except that a measuring jig having a flat container mounting plate having no projection 11 was used. Was done. Table 1 shows the results.

Comparative Example 2 In Comparative Example 1, instead of opening an opening in the side of the paper container, the paper container is cut at the center and divided into an upper part and a lower part. It was attached to the container mounting plate of the shape. The oxygen permeability was measured separately for the upper part and the lower part of the container under the same conditions as in Example 1, and the measured values were totaled. Table 1 shows the results.

[0018]

[Table 1]

As is apparent from Table 1, in Examples 1 and 2, a stable measured value was obtained with a coefficient of variation indicating a variation of the measured value of 10% or less. On the other hand, in Comparative Example 1 and Comparative Example 2, the oxygen permeability was larger than that of Example 1, and the coefficient of variation was 50% or more, so that a reliable measured value could not be obtained. This is probably because the airtightness of the portion where the paper container was mounted on the container mounting plate was insufficient, and the invasion of oxygen from that portion could not be prevented.

In the above description, the case where the measuring jig 3A is used for measuring the oxygen permeability of the paper container has been described.
It goes without saying that this measuring jig 3A can be used for containers other than paper containers. For example, as shown in FIG. 5, a plastic container 17 such as a laminate tube, a blow-molded bottle, or a PET bottle is provided on the protrusion 11 of the container mounting portion 4A.
By fitting the openings (openings), and bonding and fixing the same with an adhesive, the oxygen permeability of the plastic container can be accurately measured.

The shape of the projection 11 provided on the measuring jig 3A can be changed as appropriate. For example, as shown in FIG. 6, an annular projection 11A can be used. The use of the projection 11A is not limited to the case where the opening of the container 17 is fitted to the outside of the projection 11A as shown in FIG. Projection 11
You may use it so that the opening which forms the opening of the container 17 may be fitted inside A.

[0022]

As described above, the gas permeability measuring jig of the present invention has a container mounting plate provided with a projection for fitting the opening of the container so that the container can be hermetically sealed. Has the effect that the gas permeability of oxygen or the like can be accurately measured.

Further, in the gas permeability measuring method for a paper container according to the present invention, an opening is formed on a side surface of the paper container so that the cylindrical projection of the gas permeability measuring jig can be fitted therein, and the opening is provided in the opening. By fitting the cylindrical projections and fixing the fittings with an adhesive to measure the gas permeability of the paper container, there is a spout regardless of the presence or absence of the spout. In this case, the gas permeability of oxygen or the like in the entire paper container including the spout can be accurately measured, and the gas permeability of the paper container can be measured efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a gas permeability measuring jig according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the measuring jig shown in FIG.

FIG. 3 is a schematic perspective view of a paper container whose gas permeability is to be measured.

FIG. 4A is a schematic cross-sectional view showing a state before a paper container is mounted on a measuring jig. FIG. 4B is a schematic cross-sectional view showing a state where a paper container is mounted on a measuring jig.

FIG. 5 is a schematic sectional view showing a state in which a mouth of a plastic container is attached to a measuring jig.

FIG. 6A is a schematic cross-sectional view showing a state in which a mouth of a plastic container is attached to a measuring jig according to another embodiment of the present invention. FIG. Schematic cross-sectional view showing the state of mounting with

FIG. 7 is a schematic sectional view showing a state in which gas permeability of a container is measured using a conventional gas permeability measuring jig.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gas permeability measuring device 2 container 3, 3A gas permeability measuring jig 4, 4A container mounting plate 5, 6 pipe 5b, 6b mounting portion 11 protrusion 13 paper container 14 opening 15 adhesive

Claims (3)

[Claims] 1. A container mounting plate, and a mounting portion fixedly penetrating through the container mounting plate, one end of which is a mounting portion which can be detachably connected to a gas permeability measuring instrument, and the other end of which is provided in a container mounted on the container mounting plate. It has two pipes as insertion portions to be inserted, and a cylindrical projection formed on the container mounting side of the container mounting plate and at a position surrounding the two pipes and can be fitted into the opening of the container. A jig for measuring gas permeability of a container. 2. The jig for measuring gas permeability of a container according to claim 1, wherein the height of the cylindrical projection is 3 mm or more. 3. A gas permeability measuring jig according to claim 1, wherein an opening is provided on a side surface of the paper container so that the cylindrical projection of the gas permeability measuring jig according to claim 1 can be fitted thereto. The two pipes are connected to a gas permeability measuring instrument, and the gas permeability of the paper container is connected with the gas permeability measuring instrument. A measuring method characterized by measuring.