JP2013205057A - Inner bag for marinelli beaker and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner bag for Marinelli beakers being easily massively produced, easily mounted in a Marinelli beaker, and preventing an occurrent of a measurement error of radiant ray.SOLUTION: The inner bag for Marinelli beakers comprises a bottom part 2 molded with a metal mold, and a cylindrical barrel part 3 formed of a soft polypropylene resin. The bottom 2 has a shape corresponding to the configuration of an inside bottom part of the Marinelli beaker, and includes an erecting wall 2a of a required height formed on the outer peripheral face. The inner bag is configured by heat-sealing and connecting the erecting wall 2a to the cylindrical barrel part 3 so as to enable the mass production. Furthermore, the bottom 2 can be molded into a configuration with a shape retaining property so as to prevent a blocking action, be smoothly mounted in the Marinelli beaker, and improve workability.

Description

  The present invention relates to an inner bag for a marinelli container and a method of manufacturing the inner bag, for example, in which a specimen containing a radioactive substance is accommodated and a recess for receiving a sensor portion of a germanium semiconductor detector is provided on the bottom surface.

  As the marinade container made of synthetic resin, as shown in FIG. 6, for example, the diameter of the main body 11 in the 0.7 liter marinelli container having a small capacity is 130 mm × height 170 mm and formed on the bottom surface 12. The hollow portion 13 is large enough to fit the sensor portion of the germanium semiconductor detector. For example, the diameter is 85 mm × height is 80 mm, and the inner distance D between the main body 11 and the hollow portion 13 is about 19 mm. And a lid 14 is applied to the upper surface, and the lid has a flange portion 14a formed at the outer peripheral edge so as not to fall, and a knob portion 14b is formed at the center of the upper surface. Are widely used and known or well known. In addition, for example, the diameter of the main body 11 is in the range of 140 to 170 mm × height is 120 to 190 mm, and the recessed portion 13 of the bottom surface 12 is formed of a plurality of diameters of 85 mm × height in the range of 60 to 80 mm. Volumes (1 liter and 2 liters) are also known and well known.

  And it is preferable that the specimens to be inspected are stored directly in these marinelli containers, but the marinelli containers in which the specimens are stored directly are attached each time they are used for the next inspection. The sample must be washed and chemically removed from the transferred radioactivity and dried before it can be reused.These operations are time consuming and the test efficiency is extremely poor. In order to be able to inspect without directly entering the container, a dedicated inner bag for the marinelli container is made with a vinyl chloride sheet or film, and the marinelli container is not contaminated with the subject. Since the inner bag can be reused as soon as it is replaced, the inner bag for the marinade container is also known or known.

  As shown in FIG. 7, the inner bag 15 for the marinelli container is formed into a shape substantially corresponding to the inner shape and dimensions of the marinelli container, and the height dimension is formed approximately twice or more. It is. Specifically, as shown in FIG. 8, a vinyl chloride sheet of material is used as a part-by-part component, that is, a rectangular sheet 16 that forms a cylindrical shape that fits inside the main body 11 of the marinade container, and a bottom surface 12. A doughnut-shaped sheet 17 that covers the inner side surface, a small-sized rectangular sheet 18 that covers the rising outer peripheral surface of the recessed portion 13, and a circular sheet 19 that covers the top of the recessed portion 13 are prepared.

  Next, by manual work, the rectangular sheets 16 and 18 are first rounded into a cylindrical shape or a cylindrical shape, and the short sides are welded a and b, and one end of a small-sized sheet 18 rounded into a cylindrical shape. A circular sheet 19 is welded to the edge of the inner circle of the doughnut-shaped sheet 17 and the other end of the sheet 17 is rolled into a cylindrical shape on the outer peripheral edge of the sheet 17. The inner bag 15 for the marinelli container is manufactured by welding e, and in use, the small-diameter cylindrical portion formed by the circular sheet 19 and the cylindrically wound sheet 18 is formed by the sheet 16. It is pushed into the inside of the large-diameter cylindrical body portion and used by being mounted in the main body 11 of the marinellied container.

There is no patent document.

  By the way, since the inner bag 15 for the marinelli container according to the known or well-known example contains a radioactive substance for inspection, liquid leakage occurs if there is a welding defect or a pinhole in the welding a to e portions. Therefore, it is necessary to weld each part manually by a veteran engineer and finish it with high accuracy. There are 5 parts of welding a to e. Not only is the manufacturing efficiency low and the inner bag itself is expensive because it is performed by work, but the number of examinations per day is limited by the fact that the inner bag cannot be obtained by the radiation inspection mechanism. The actual situation is that the inspection cannot be performed at the scheduled speed, and there is a problem that the inspection is delayed.

  Further, if the inner bag 15 for the marinade container is fitted to the inner side of the marinelli container to be used with good dimensional accuracy so as not to cause wrinkles or excessive gaps, the measurement error of radiation increases and the credibility is impaired. It has the problem of being a result.

Furthermore, since the inner bag 15 for the marinelli container has many welded parts and is inefficiently manufactured by manual labor, the unit price per bag is increased, and a large number of types of subjects are brought in. However, there is a problem that the inspection takes time because there are not enough inner bags.
Further, since the inner bag is made of vinyl chloride, not only the blocking effect is strong, but the mounting to the marinelli container cannot be carried out smoothly. In particular, in the marinelli container having a small capacity, the distance D between the main body 11 and the recessed portion 13 Is as narrow as about 19 mm, and it is difficult to attach the inner bag 15 for the marinellier container 15 within the narrow space D with no gaps, and it is difficult to mount the bag with high dimensional accuracy. doing.

  The main object of the present invention is that mass production is easy, and there are no joints or wrinkles such as welding on the sensor side of the detector, so that no measurement error of radiation occurs, and mounting in a hollow portion It is providing the inner bag for marinelli containers which improved the workability and improved the workability at low cost.

  As a specific means for solving the above-mentioned problems, the present invention comprises, as a first invention, a bottom portion molded with a mold and a cylindrical body portion formed of a soft polypropylene resin, and the bottom portion is a marinade container. For a marinelli container characterized in that a rising wall having a required height is formed on the outer peripheral surface, and the rising wall and the cylindrical body are connected by heat sealing. An inner bag is provided.

  In the first invention, the bottom portion is molded from a resin material in which an olefin resin is mixed with polypropylene resin and has shape retention; and a plurality of groove-shaped recesses for venting air are formed on a lower end surface of the bottom portion. Is included as an additional requirement.

    As a second invention, a step of molding the bottom into a shape corresponding to the inner bottom structure of the marinelli container using at least a male mold and a female mold, and a cylindrical body connected to the bottom is made of soft polypropylene It consists of a step of forming with resin and a step of heat-sealing the cylindrical body to the bottom and integrally connecting the bottom, and the bottom has shape retention with a resin material in which an olefin resin is mixed with polypropylene resin. Thus, the present invention provides a method for manufacturing an inner bag for a marinelli container.

  In the second aspect of the present invention, an additional requirement is that the thickness of the soft polypropylene resin of the cylindrical body is 150 to 400 μm.

  According to the first and second aspects of the present invention, it comprises a bottom portion molded by a mold and a cylindrical body portion formed of a soft polypropylene resin, which are integrally connected by heat sealing means. Since the bottom part can be molded into a shape-retaining structure, the blocking action does not occur and it can be smoothly attached to the marinade container and the workability is good. There is an excellent common effect.

It is the perspective view which isolate | separated and showed the structural member of the inner bag for marlinelli containers which concerns on preferable embodiment of this invention. It is the side view which showed a part of inner bag for marinade containers which concerns on the same embodiment by the cross section, and expanded and showed a part. It is the perspective view seen from the lower surface side of the inner bag for marinellier containers concerning the embodiment. It is sectional drawing of the principal part which isolate | separated and showed schematically the metal mold | die for demonstrating the manufacture condition of the inner bag for marinade containers which concerns on the embodiment. It is sectional drawing of the principal part shown combining the metal mold | die for demonstrating the manufacturing condition of the inner bag for marinade containers which concerns on the embodiment. It is a sectional side view which shows an example of the 0.7 liter marinade container based on the well-known or well-known prior art example. It is the perspective view which looked at the well-known or well-known inner bag for marinelli containers used for the marinelli container from the bottom. It is the top view which decomposed | disassembled and showed the inner bag for the marinade container for every component part.

  The present invention will be described based on the embodiment shown in FIGS. In FIG. 1, an inner bag 1 for a marinelli container according to the present invention is obtained by superposing a part of two resin parts and connecting the superposed parts in series by heat sealing. Is the bottom 2 and the other is the cylindrical body 3.

The bottom 2 is formed by molding a resin material in which an olefin resin is mixed with polypropylene resin with a required mold, and at the time of molding, groove-like recesses 4 for venting air are formed at a plurality of locations from the bottom surface to the side surface. It is connected to increase the strength of the bottom. Then, the height of the rising wall 2a on the outer peripheral side surface of the bottom portion 2 does not need to be so high for convenience of molding, and may be long enough to be connected to the cylindrical body portion 3, that is, high. The molded product has a certain degree of hardness and maintains the shape of the inner bottom of the marinelli container as shown.
Moreover, the other cylindrical trunk | drum 3 is formed in the elongate cylindrical shape from the beginning with the soft polypropylene resin film or sheet | seat, and cut | disconnects it to required length.

  When connecting the bottom part 2 and the cylindrical body part 3 thus molded, as shown in FIG. 2, it is necessary to cover the lower end of the rising wall 2 a of the bottom part 2 with the lower end of the cylindrical body part 3. Overlap over the length, and the overlapped portion can be connected in series by forming the seal portion 5 by heat sealing means, whereby the marinade container inner bag 1 is completed.

  Since the inner bag 1 for the marinelli container of the present invention is formed by using a mold having the same shape and size as the inner bottom portion of the marinelli container used, the inward convex portion formed on the bottom portion 2 is used. 6 (concave portion when viewed from the outside) is a dent shape (indented portion 13 in FIG. 5) of the marinelli container, that is, a state in which it covers the rising peripheral surface and the top portion with good dimensional accuracy and the bottom portion 2 is Since the shape is maintained with a certain degree of hardness, when attaching to the marinelli container, the inner bag 1 for the marinelli container is attached from the opening of the marinelli container and the top of the convex portion 6 (concave) is pointed to the inside. By pressing lightly, it can be easily mounted, and the mounting work during use is remarkably reduced.

  Regarding the inner bag 1 for the marinelli container of the present invention, the dimensions as an example are shown as follows: an inner bag for 0.7 liters, and the thickness of the film or sheet is preferably about 200 ± 50 μm. The outer diameter of the portion 3 is 120 ± 2 mm, the diameter of the recess 6 in the bottom 2 is 89 ± 1 mm, and the height is 80 ± 1 mm. This is an example, and the other inner shells for marinelli containers are basically molded according to the inner size of the marinelli containers actually used, and the height (length) of the marinelli containers is The thickness of the soft polypropylene resin film or sheet is appropriately selected within a range of ± 15% in the range of 150 to 400 μm depending on the object to be inspected. 1 is formed.

Next, with reference to FIG. 4 and FIG. 5, the manufacturing method of the inner bag 1 for marinade containers is demonstrated.
As for the molding of the bottom portion 2 by the mold, for example, a male mold 7 having a matching mold (common name: ack molding) whose shape substantially matches the shape and dimensions of the inner bottom structure of the marinade container. And a female mold 8 that fits with the male mold 7 with a required gap. At least the male mold 7 is made of, for example, porous aluminum having air permeability, and the mold release gradient is 0. The range is 5 to 1 °.

  And in the state which heated both metal mold | dies 7 and 8, the sheet-shaped resin material 9 of the required size which exhibits a circular shape is mounted in the male mold | type 7, vacuum-molded, and the female mold | type 8 is united after that. Resin material molded by vacuuming both the molds 7 and 8 after molding the thick part by vacuum molding and filling the gaps between both molds evenly to form the shape of the substantially bottom 2 9 is cured, the cured state is estimated, the female mold 8 is pulled apart and air is sent into the male mold 7 so that the molded product (bottom) can be easily extracted from the male mold 7 even if the mold release gradient is small. Thus, there is little dimensional error with the bottom of the marinellier container, and the bottom 2 that fits perfectly can be molded.

  The cylindrical body 3 formed of a soft polypropylene resin film or sheet is integrally connected to the bottom 2 molded by the molds 7 and 8 in this way. 2, the outer periphery of the rising wall 2 a of the bottom portion 2 and one end of the cylindrical body 3 are overlapped over a required width, and the overlapped portion is formed along the outer peripheral surface by the heat seal means to form the seal portion 5. Are integrally connected, and the bottom portion 2 is completed as the inner bag 1 for the marinelli container having shape retention. In addition, although the said shaping | molding is an example which used the metal mold | die, the bottom part 2 can also be formed by omitting the female type | mold 8 and using only the male type | mold 7, and vacuum forming.

  The inner bag 1 for a marinelli container according to the present invention separately forms a bottom portion 2 having a required hardness and a cylindrical body portion 3 formed of a soft polypropylene resin film or sheet, and connects them with heat sealing means. Therefore, it is possible to mass-produce inner bags having a size that is substantially the same as the inner size of the marinelli container and having a good dimensional system. Moreover, since the bottom portion 2 has shape retention, Since it can be set quickly without any large gaps or wrinkles between them, workability is remarkably improved and accurate inspection can be performed, and it can be widely used for measurement of this kind of radiation.

1 Inner bag for marineri container
DESCRIPTION OF SYMBOLS 2 Bottom part 2a Standing wall 3 Cylindrical trunk | drum 4 Groove-shaped recessed part 5 Seal part 6 Convex part 7 Male type 8 Female type 9 Sheet-like resin material 11 Main body of marinelli container 12 Bottom face 13 Indented part 14 Lid 14a Flange part

Claims (5)

It consists of a bottom part molded with a mold and a cylindrical body part made of soft polypropylene resin.
The bottom is a shape corresponding to the inner bottom structure of the marinelli container, and a rising wall having a required height is formed on the outer peripheral surface,
An inner bag for a marinade container, wherein the rising wall and the cylindrical body are connected by heat sealing. The inner bag for a marinelli container according to claim 1, wherein the bottom portion is molded from a resin material in which an olefin resin is mixed with polypropylene resin and has shape retention. The inner bag for a marinade container according to claim 1, wherein a plurality of groove-like recesses for venting air are provided on a lower end surface of the bottom portion. Molding the bottom into a shape corresponding to the inner bottom structure of the marinellier container using a mold comprising at least a male mold and a female mold;
Forming a cylindrical body portion connected to the bottom portion with a soft polypropylene resin;
It comprises a step of heat-sealing the cylindrical body portion to the bottom portion and connecting them integrally.
The method for producing an inner bag for a marinade container, wherein the bottom portion is formed of a resin material obtained by mixing an olefin resin with a polypropylene resin so as to have shape retention. The thickness of the soft polypropylene resin of the said cylindrical trunk | drum is 150-400 micrometers. The manufacturing method of the inner bag for marinelli containers of Claim 4 characterized by the above-mentioned.

Images