JPS5962442A - Metallic vessel having excellent air-tight capability - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal container that is airtightly sealed at the joint portion between the top/bottom plate and the body, or at the flange portion for attaching a cap such as a large mouth or a small mouth.

Metal cans such as drum cans, bale cans, and open cans are often used for small-scale storage or transportation of industrial liquids such as oil, industrial chemicals, edible oils, and various household oils, and their sealing methods also vary. It has been established for some time.

To simplify the explanation below, a drum can will be taken as an example. First, a drum can is generally formed by the following steps.

As shown in the conceptual diagram in Figure 1, the drum can is press-fitted with seven flange flanges.At this time, in order to maintain airtightness, elastic synthetic rubber such as asbestos, butyl rubber, buna rubber, fluorine rubber, silicone rubber, etc. is inserted as a gasket material (Figure 6).

In addition, when joining the can body 6, top plate 1, and base plate 2, the top plate 1 and base plate 2 are fitted to the body 6, and the seaming machine is used to tighten the seams while rotating. The airtight effect is maintained by applying a synthetic rubber emulsion type compound.

However, according to the above-mentioned large-mouth and small-mouth cap attachment methods, the airtightness is excellent immediately after the cap is attached, but the gasket material swells depending on the contents stored in the container, and when it protrudes, the gasket material may swell. It may fall into the inside of the container or elute, causing discoloration and deterioration.

It is possible to use a special drum using a gasket material that matches the nature of the object to be stored, but this is complicated because gaskets made of many different materials must be prepared depending on the nature of the object to be stored. Not only that, but mistakes may occur in response, which may lead to accidents.

If a gasket material made of rubber or the like cannot be used, an asbestos backing is used, but this asbestos backing has poor elasticity and is prone to leakage.

Also, when using a synthetic rubber emulsion type compound and driving it in when wrapping the top and bottom plates around the body, depending on the driving direction, it is not always possible to fill all the gaps with the compound, as shown in Figure 5, for example. Therefore, leakage accidents are likely to occur. Furthermore, since this compound is in the form of an emulsion with a solid content of 64 to 65%, it has a tendency to essentially decrease in volume due to the volatilization of water, so the generation of voids is inevitable. There was always concern about maintaining airtightness.

The present inventors have focused on the above-mentioned points, have studied alternatives to materials that have been found to have drawbacks, or are likely to have them, and have arrived at a metal container using a hot-melt type synthetic resin film.

Excellent hot melt type synthetic resin adhesives have recently appeared on the market. For example, a polyolefin thermal adhesive film with a thickness of about 50 μm is sandwiched between two steel plates, and the steel plates are bonded by heat and pressure at 180'C x 10 minutes. Comrades bond extremely strongly. Specifically, 1.2 cabinets x 15mm x
A 180° peel test was performed on a test piece made by sandwiching a heat-adhesive film between two 100wn thin steel plates and bonding them under heat, and the result was more than 10 kg/cr! Some strong adhesion forces have been observed.

This type of hot melt type synthetic resin has excellent chemical resistance and exhibits stable airtightness against a wide range of objects without causing corrosion or melting. This has the advantage of not causing deterioration or alteration of the contained object.

Moreover, hot-melt type synthetic resins have the advantage that they can be obtained at low cost and of stable quality, thereby reducing can manufacturing costs.

Although the above description has been made using the manufacturing of drum cans as an example, the present invention can also be used for the cap part or the part where the top plate/base plate is wrapped around the body of bale cans, open cans, and other similar metal containers. Not even.

EXAMPLES The present invention will be specifically explained below with reference to Examples.

Example 1 A commercially available heat-adhesive olefin synthetic resin film with a thickness of 1 m was cut into dimensions corresponding to the large and small flange seat plates of a drum, fitted into the respective cap flanges, and then inserted into the designated openings of the top plate. After insertion, it was attached with a 100"l brace. Thereafter, it was heated at 180° C. for 10 minutes, and the internal film melted uniformly as shown by 7 in FIG. 4, resulting in complete adhesion.

When this product was subjected to a leakage test using air pressure of 2.0 kg·f/crl x S minutes, no leakage was detected at the base. This mouthpiece was immersed in MEK and Triclean baths at 50° C. for 1 week, but no swelling was observed. On the other hand, as a control example, when we conducted an immersion test on the base washer using conventionally used gasket materials of butyl rubber, beech, and asbestos, the former two clearly swelled and the liquid was black (colored). Although there was no apparent change in the shape of the gasket, the liquid turned slightly black because the gasket contained a rubber component.

Example 2 A thermal adhesive film of 150μ thickness x 25 width is pasted on the top and bottom edges of a drum can with a plate thickness of 1.2 thighs, fitted into the body cylinder, and wound with a tightening machine to form a chime. did. Next, after passing through a heating process of 180° C. for 10 minutes, water pressure was applied to this to perform a bursting test.

As a comparison test can, a drum can (180'x
Moisture in the compound is removed by heat treatment for 10 minutes)
A bursting test was conducted under similar conditions using

In the conventional can, the seamed portion opened at a water pressure of 4.7 kg·t/di, whereas in the case of the can obtained according to the present invention, the seaming part opened at a water pressure of 4.7 kg·t/di.
The tightened part did not loosen until the weight reached 5 kg·t/ri, and it was confirmed that the adhesive effect was sufficiently exhibited.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the drum, Figure 2 is a central sectional view (A) and top view ('B) of the top plate, Figures 6 and 4 are partially enlarged sectional views of the mouthpiece, and Figures 5 and 6. is a partially enlarged cross-sectional view of a tightening portion. 1... Top plate, 6... Body, 4, 5... Base, 6...
...Compound, 7...Synthetic resin, 8...Compound. Agent Patent Attorney Sanro Kimura (7) Figure 1 Figure 2 Figure 5 Figure 61! !

Claims (1)

[Claims] A metal container with excellent airtightness, characterized in that a hot-melt type synthetic resin film is inserted into the mouthpiece mounting flange portion, the rolled-up portion, or both of the metal container and bonded by heat.