JP2008302410A - Manufacturing method of metal container having excellent sealing ability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of metal container having excellent sealing ability at a seaming part of a metal container. <P>SOLUTION: In the manufacturing method of metal container having excellent sealing ability, the metal container is continuously manufactured by using a filler for sealing at the seaming part of a joint part of the top and bottom plates and a shell plate. Immediately before seaming the top and bottom plates and the shell plate, a first pre-compound is applied on the circumference at the tip bent part of the top and bottom plates and the tip part of the shell plate. Furthermore, a second pre-compound is applied on the circumference of the top and bottom plates between the top and bottom plates and the shell plate, and dried. Thereafter, the top and bottom plates and the shell plate are seamed to be joined by a seamer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a metal container having excellent airtightness in a winding portion of a metal container.

  Conventionally, many metal containers such as drums, pail cans, food cans and aerosol cans are used as storage, transport or containers for industrial materials such as paints, adhesives, synthetic resins, household chemicals and foods. Has been. As these conventional techniques, a drum can will be described as an example. FIG. 3 is a schematic view of a general drum. As shown in FIG. 3, the drum can is composed of a top plate 1, a base plate 2, and a body plate 3, and a large plug 4 and a small plug 5 are formed on the top plate 1. The large plug 4 is an injection hole, and the small plug 5 functions as a ventilation hole.

  FIG. 4 is a detailed view of the tightening portion. The top plate 1 and the base plate 2 are joined to the body plate 3 by tightening, and the sealing compound is filled in the tightening portion so It works to prevent leakage. Therefore, when the drum plate 3 and the top plate 1 and the main plate 2 are joined, the top plate 1 and the main plate 2 are first fitted to the main plate 3 and continuously wound while being rotated by a winding machine. Immediately before the tightening, the body plate 3 and the top plate 1 are wound in such a manner that the sealing compound is wound around the end portion of the body plate 3 and the tip of the top plate 1 or the base plate 2. Hereinafter, the top plate or the base plate is referred to as “top plate”.

  FIG. 5 is a diagram showing a state where the top and bottom plates are not wound around the trunk plate. That is, it shows a state where the top and bottom plates 1 and 2 in front of the winding machine have not been wound around the trunk plate. FIG. 6 is an explanatory view showing a result of conventional winding. Fig.6 (a) is a figure which shows the case where a winding shape is good, and FIG.6 (b) is a figure which shows the case where a winding shape is bad. In addition, there are a case where the winding condition is deteriorated due to an inappropriate winding condition and a case where the winding shape is deteriorated due to impact or deformation after canning. On the other hand, as shown in this figure, when a certain amount of compounding is put in the pre-compound 6, there is no problem when the winding shape is good, but when it is bad, the companding space becomes large, and the hatched portion 7 becomes a gap and leakage occurs. There was a problem that occurred.

In order to solve the above-described problems, for example, as disclosed in JP-A-5-15934 (Patent Document 1), a sealing filler is provided on a winding chime portion of a joint portion between the top plate and the trunk portion. In the process of continuously producing a metal container using a glass, near the outlet of the drying furnace after chemical conversion treatment or the baking furnace after painting the inner surface of the can, at the peripheral edge of the top and bottom plates heated to 70-100 ° C There has been proposed a method for manufacturing a metal container having excellent sealing performance, in which a sealing compound is applied and dried, and then the top plate and the body are wound together by a winding machine.
Japanese Patent Laid-Open No. 5-15934

  However, since the compound space as described above changes greatly as the winding shape changes, it causes leakage. Moreover, although patent document 1 is excellent in the sealing performance with respect to various contents, there exists a fault which requires installation of a drying furnace and a production cost rises because a production process becomes long. In order to solve these conventional drawbacks, an object of the present invention is to provide a metal container excellent in sealing performance by a new double compound method.

  Therefore, as a result of intensive studies to solve the above-described problems, the present inventors tighten the top plate and the trunk plate at the fastening portion where the top plate and the trunk plate of the metal container are joined. Just before double compounding, the compound enters between the top plate and the trunk plate, so the gap does not change, it can always keep the sealing property, it is in a metal container with excellent sealing property that can prevent leakage .

The gist of the invention is that
(1) When manufacturing a metal container continuously using a sealing filler at the tightening portion of the joint between the top plate and the body plate, immediately before tightening the top plate and the body plate, the tip of the top plate The first pre-compound is applied to the circumference of the bent plate, and the second pre-compound is applied between the top plate and the main plate on the periphery of the top plate, dried, and then tightened. A method of manufacturing a metal container having excellent airtightness, wherein the top plate and the body plate are wound and joined by a machine.

(2) The coating amount of the first pre-compound described in (1) is 2 to 8 g / sheet in a metal can having a circumference of 1.8 m, and the second pre-compound is 0.5 to 3 g / sheet. A method for producing a metal container having excellent airtightness.
(3) The method for producing a metal container having excellent airtightness, characterized in that the drying temperature of the pre-compound described in (2) is 80 to 120 ° C. and the drying time is 2 to 5 minutes.

  As described above, according to the present invention, a special heating furnace is not required as compared with the case where a conventional sealing agent is used, and it is possible to perform processing on a conventional production line, and to the contents. Nevertheless, the sealing performance is not affected at all, and an excellent effect is obtained in that a metal container having extremely excellent sealing performance can be obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view of a double compound method according to the present invention. As shown in FIG. 1, FIG. 1 (a) shows a double compound method according to the present invention, and FIG. 1 (b) shows a conventional compound method. In the case of FIG. The first pre-compound 6 is automatically sprayed and applied to the tip of the body plate 3 at the tip bending portion. In the present invention, in addition to FIG. 1 (b), as shown in FIG. 1 (a), the second pre-compound 8 is sprayed and applied to the circumference of the top plate 1 between the top plate 1 and the body plate 3. To do.

  FIG. 2 is an explanatory view showing the result of tightening after applying the double compound according to the present invention. As shown in this figure, as a result of the tightening by the second pre-compound 8, the space between the top plate 1 and the body plate 3 is completely sealed. For example, the tightening shape as shown in FIG. Even if the compound space becomes large and the hatched portion 7 becomes a gap and a leak occurs, it is sealed by the second pre-compound 8 and has no influence on the sealing performance regardless of the tightening shape and contents, and is extremely hermetically sealed. An excellent metal container can be obtained.

  The pre-compound according to the present invention is mainly composed of a synthetic emulsion or natural rubber, and an aqueous emulsion type mainly composed of an inorganic filler. For example, the component composition thereof is a rubber elastomer: 26%, an inorganic filler. Agent: 42%, ammonia water: 31%, solid content: 68%, viscosity: 25 ° C., BH meter, 3500 cps at 20 rpm. For wet pre-compounds, the component composition is rubber elastomer: 24%, inorganic filler: 49%, synthetic polymer as thickener: 2%, aqueous ammonia: 25%, solid content: 75% Viscosity: 25 ° C., BH meter, 16000 cps, etc. at 20 rpm.

  The amount of the compound applied is 1 to 8 g / sheet in a metal can having a circumference of 1.8 m (diameter 567 mm). When the application amount of the first pre-compound was less than 2 g / sheet, sufficient sealing performance was not obtained, and when it exceeded 8 g / sheet, the compound could protrude out of the winding. In addition, Preferably it is 3-5 g / sheet. In addition, for the second pre-compound, the sealability between the top plate and the steel plate as the second pre-compound is not sufficient if it is less than 0.5 g / sheet, and if it exceeds 3 g / sheet, the compound can protrude out of the winding. The range is 0.5 g / sheet to 3 g / sheet because of its properties. Preferably, it is 1 to 2 g / sheet.

  The drying temperature is 80 to 120 ° C. and 2 to 5 minutes. If the temperature is less than 80 ° C., the drying is not sufficient, and the sealing property is not sufficient due to subsequent drying shrinkage. If the temperature exceeds 120 ° C., the component composition of the pre-compound is changed, so the range is set to 80 to 120 ° C. Preferably it was 90-110 degreeC. Further, if the drying time is less than 2 minutes, a sufficient drying effect cannot be obtained. Moreover, since productivity will worsen when it exceeds 5 minutes, the range shall be 2 to 5 minutes. Preferably it is 2-3 minutes.

Hereinafter, the present invention will be described in detail with reference to examples.
In manufacturing a general steel drum can having a plate thickness of 1.2 mm and a container of 200 L, an aqueous emulsion pre-compound was used. This pre-compound has a solid content of 68%, a viscosity of 3500 cps (25 ° C., BH meter, 20 rpm), and a composition of rubber elastomer: 23%, inorganic filler: 42%, other: 3%, aqueous ammonia: 32% It is. On the other hand, after punching or cutting into a predetermined shape from a steel plate, a ceiling plate, a base plate, and a cylindrical body are obtained through press forming, roll forming and welding. Next, after a degreasing, chemical conversion treatment, hot water washing, and drying process, a joining process is performed by winding the top plate and the body part into a drum shape.

  In the above process, before starting the joining process by tightening the top plate and the body, the top plate with a diameter of 567 mm (circumference 1.8 m) was continuously rotated, and the double compound amount as shown in Table 1 was applied. . Two of these double compounds are applied to the circumference by centrifugal force generated by the rotation of the top and bottom plates. Thereafter, various drying temperatures and drying times shown in Table 1 were used. After this drying process, the process enters a joining process by winding the top plate and the body part into a drum shape.

  Regarding the result, the result of observing the cross section with a microscope by cutting the tightening portion was well filled in the first pre-compound portion and the second pre-compound portion as shown in FIG. Table 1 shows the airtightness of the drum thus obtained together with a comparative example. As an airtightness test, an empty drum was dropped from a height of 600 mm using a winding part as an impact point, and then 5 liters of DMF (N, N-dimethylformamide), which is said to be most likely to leak, was placed in a can. ◎, good that keeps stable and good airtightness by keeping the inner pressure of 30 kpa in the can and holding it for 24 hours and observing leakage from the winding part A sample having a good airtightness was evaluated as ◯, a sample having a slightly good airtightness was evaluated as Δ, and a sample having a poor airtightness was evaluated as ×.

  The results in the state where the drum can be tightly wound after being filled with the first pre-compound and the second pre-compound, which are factors about the airtightness of the drum can described above, were investigated. Regarding the filling properties of the pre-compound at that time, a good one was evaluated as ◯, an almost good one as Δ, and a bad one as ×.

表１に示すように、Ｎｏ．１〜１０は本発明例であり、Ｎｏ．１１〜１５は比較例である。

As shown in Table 1, no. 1 to 10 are examples of the present invention. 11 to 15 are comparative examples.

  Since Comparative Examples 11 to 15 are single compounds, the contents in the cans are not in a state of maintaining a perfect sealing property. In Comparative Example 16, since the application amount of the first pre-compound and the second pre-compound is small, the airtightness is not sufficient. In Comparative Example 17, since the application amount of the first pre-compound and the second pre-compound was large, the compound protruded out of the winding portion. In Comparative Example 18, since the drying time of the first pre-compound and the second pre-compound is low, the filling property is not sufficient.

  In Comparative Example 19, since the drying temperature of the first pre-compound and the second pre-compound is high and the drying time is long, the pre-compound is transformed, the filling property is not sufficient, and the airtightness is not sufficient. In Comparative Example 20, since the drying time of the first pre-compound and the second pre-compound is short, the filling property is not sufficient and the airtightness is not sufficient.

  As described above, by applying the double compound according to the present invention, the conventional compound space has changed greatly due to the change in the winding shape, causing leakage, but between the trunk plate and the top plate. When the filler enters, the gap does not change. Therefore, even if the winding shape changes, it is possible to always maintain the sealing performance, and it has an extremely excellent effect of preventing leakage.

It is the schematic about the double compound method which concerns on this invention. It is explanatory drawing which shows the result tightened after applying the double compound which concerns on this invention. It is the schematic of a common drum. It is detail drawing of a winding part. It is a figure which shows the state which has not fastened the top and bottom board to the trunk | drum. It is explanatory drawing which shows the result of the conventional winding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 2 Ground plate 3 Trunk plate 4 Large plug 5 Small plug 6 Pre-compound 7 Shaded part 8 2nd pre-compound


Patent Applicant Nippon Steel Drum Co., Ltd.
Attorney Atsushi Shiina

Claims (3)

When manufacturing a metal container continuously using a sealing filler at the tightening part of the joint between the top plate and the body plate, immediately before tightening the top plate and the body plate, Then, the first pre-compound is applied to the tip of the shell plate around the circumference, and further, the second pre-compound is applied between the top plate and the shell plate around the top plate and dried. A method for producing a metal container having excellent airtightness, wherein a top plate and a body plate are wound and joined. The amount of application of the first pre-compound according to claim 1 is 2 to 8 g / sheet in a metal can having a circumference of 1.8 m, and the second pre-compound is less than 0.5 g to 3 g / sheet. For producing a metal container having excellent properties. A method for producing a metal container having excellent airtightness, wherein the pre-compound according to claim 2 has a drying temperature of 80 to 120 ° C and a drying time of 2 to 5 minutes.

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