JPS6050655B2 - container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to a shell-to-lid attachment arrangement for containers for pressurized liquids, and more particularly, to a container body having a vertical edge with a metal lid attached thereto. The present invention relates to a container in which the structure of the lid, in cooperation with a suitable adhesive, is suitable for containing a pressurized liquid.

Currently, there are several ways to attach a metal lid to a container body, whether the container body is made of metal, composite material, or plastic.

Typically, metal closures are attached to the container body by a mechanical fit between some type of closure and the edge of the container body. In fact, it was generally impossible to fill the container with processed product unless the lid was attached to the container body with some form of fit. Also, to prevent leakage of the contents from the sealed area, it was necessary to It has been found that sealing compounds must be used on the seams of containers.Over the years, this has been done, firstly to make them cheaper, and secondly to improve the appearance of the container so that the user feels good about it. There have been many attempts to improve the end seam configuration to provide better durability, such as U.S. Pat. No. 2,467,182.
The specification describes a method of attaching a lid having a circumferential groove formed by parts of the inner and outer vertical walls, and in which the inner vertical wall part continuously transitions to the central closing part at its lowest end. A method is disclosed in which a sealing compound is coated on the inner surface of the circumferential groove at a location around the vertical edge of the container body, and the inner and outer vertical walls forming the circumferential groove are crimped to allow the container body to hang. Mechanically engage the edges. US Patent No. 23033n
The specification describes an end seam construction somewhat similar to the previously described method, in which the mechanical engagement of the metal lid with the side wall edge of the container body is achieved by the external droop of the peripheral groove. The lid is locked to the container body by providing a hem-shaped curling on the vertical wall and pressing the peripheral edge of the side wall of the container body into the edge groove. Again, in order to assist in fixing the lid to the container body, A sealing compound or adhesive is applied along the inner surface of the depending internal vertical wall and the bottom part of the peripheral groove 4. However, it must be noted that in both of the above two patent specifications, the lid is fixed to the container body primarily by mechanical means, and the sealing compound or adhesive is not applied to the edge of the container. It is used for the secondary purpose of seaming and sealing containers, and is rarely used for attaching lids to container bodies. In addition, U.S. Pat. No. 2,801,648 discloses an overlapping structure formed using only an adhesive to secure the hanging skirt portion or vertical wall portion of the metal lid to the vertical edge of the side wall of the metal container body. Seams are shown. The disadvantages of this type of groove construction are:
Because the adhesive is applied only to the outer surface of the side edges of the container body, the 3 uncoated metal edges of the side edges of the container body, which are normally susceptible to corrosion, are in direct contact with the contents of the container. However, since the adhesive used in this edge seam method has a limited surface area, it must be strong and therefore expensive. It is also pointed out that 4c. Furthermore, nothing is said as to whether such a structure can be filled with pressurized products. In addition, when seaming the ends, consideration must be given to minimizing the influence of the thickness of the end seams.

The relatively thick end seam, commonly referred to as a chime, creates problems regarding misuse of the container and at the same time makes packaging difficult. Accordingly, in this field, neck-in metal containers have recently been used in which the ends of the container body are necked in so that the end seams do not protrude beyond the diameter of the container. However, manufacturing a container with a neck-in portion is relatively expensive, requires sophisticated processing of the metal in the container and side walls, and reduces the wall thickness of the container body.
Since the resistance to vertical compression is reduced, it has the disadvantage of having a portion where crushing of the container body due to vertical compression is likely to begin. Therefore, the main object of the present invention is to provide a new attachment configuration between metal lid and container body, which structure does not require mechanical bonding structure, is economical and simple in design, Moreover, it is as effective as the prior art, and the chime effect of the end seams can be minimized. According to the present invention, a metal lid whose inner surface is coated with an epoxy-phenol resin paint or an epoxy-amino resin paint, and a metal container body or inner and outer surfaces whose inner and outer surfaces are coated with a vinyl chloride-vinyl acetate copolymer resin paint. In a pressurized liquid container consisting of a composite container body coated with an epoxy-phenol resin paint or an epoxy-amino resin paint, the metal lid has an annular shape surrounding the periphery of the central closing part and opening toward the container body. inner and outer vertical walls that form a groove and are connected via a flange; the vertical end of the container body on the opening side is inserted into the annular groove, and the inner and outer vertical walls that form the annular groove are provided; Each inner surface and the vertical end are bonded together with a thermoplastic adhesive, the thermoplastic adhesive having an adhesive strength that can withstand the internal pressure of the container resulting from the pressurized liquid; Ethylene-vinyl acetate-organic acid terpolymer with an acid value of 6 and containing 65%
(b) 5 parts by weight of a copolymer obtained by block polymerization of 2 parts by weight of styrene molecules and 7 parts by weight of butadiene molecules, and 21 parts by weight of polyterpene resin. or (c) 75 parts by weight of a polyamide with a melt index ranging from 6 to 15 at 205°C and 25 parts by weight of a polyterpene resin.
A pressurized liquid container is obtained, characterized in that the adhesive is mixed with parts by weight of the adhesive.

Specific examples of the present invention will be described below.

FIG. 1 is a perspective view of an exemplary container of the present invention, and FIG. 2 is an enlarged partial cross-sectional view of the container taken along line 2--2 in FIG.

In FIG. 1, 10 indicates a container. The container 10 may be a fiber or composite type container, or may be a thin walled container made of metal, plastic, or the like. Container 10 includes a container body 12 which, if made of fibrous material, is formed by spirally wrapping a sheet of composite material into a cylinder having a helical seam 14.
A pair of metal lids 16, 1 are provided at both open ends of the container body 12.
Seal with 8. The lid is glued to the container body at end seams 20, 22, respectively. The lids 16 and 18 may be of the same shape and are shaped with a generally flat central closure 24 and a reinforcing annular groove 26 surrounding its periphery, as seen in FIGS. 1 and 2. . Reference numeral 30 designates a substantially straight inner vertical wall 30 extending upwardly from the outer end 28 of the annular reinforcing groove 26, the upper end of which forms an outwardly extending flange 32.

34 is a substantially straight outer vertical wall depending from flange 32.

The outer vertical wall 34 is shaped parallel to the upright inner vertical wall. These inner and outer vertical walls 30 and 34 are connected to the lid 16 (1
In the case of No. 8, an annular groove 36 is formed which surrounds the periphery of the container and is open to the container body side. The end seam 20 joining the lid 16 to the container body 12 connects the lid 18 to the container body 12.
The seam 20 may be of the same shape as the end seam 22 which joins the vertical edge 38 of the open end of the container body 12 to the annular groove formed by the inner and outer vertical walls 30 and 34. 36.

As can be easily seen in Figure 2, the thickness of the end seam 20 is relatively small, being only three times the thickness of the material, with only one sheet of material protruding from the side wall of the container body. It's only a matter of time. A key feature of the invention is an adhesive 40 (applied within the annular groove 36) that adheres the container body 12 to the lid 16.
This is because it has adhesive strength that can withstand the pressure inside the container generated from the pressurized liquid being filled.

As can be seen in FIG. 2, the adhesive 40 within the annular groove 36 that adheres the inner surface 42 of the inner vertical wall 30 to the inner surface 44 of the upright edge 38 of the container body 12 is less susceptible to peel stress than Subject to shear stress caused by pressure. In this connection, it must be acknowledged that the peel strength of most adhesives is very small compared to their shear strength;
The construction method of the invention makes full advantage of this material property of the adhesive. This construction, in which the inner vertical wall 30 receiving the adhesive 40 is substantially straight, thereby reducing peel stress, increases buckling resistance in the reinforcing annular groove 26 of the lid. 40 more adhesive
adheres the inner surface 46 of the outer vertical wall 34 facing the annular groove 36 to the outer surface 48 of the vertical edge 38 of the container body 12. The surface area of the container body 12 bonded to the lid 16 in this manner is relatively large and spans the inner and outer surfaces 44 and 48 of the bevel 38. It must be pointed out that the inner surface of the lid and the inner and outer surfaces of the container body are coated with materials to protect the materials that make up the container from the often corrosive liquids that are filled inside the container. 50 and 52 are covered with a protective coating.

The adhesive selected for attaching the lid 16 to the container body 12 must therefore cooperate with the coating materials. Ethylene-vinyl acetate terpolymers, block-polymerized butadiene-styrene copolymers, and polyamide polymers have been successfully used to bond protectively coated lids to coated fiber-inover or metal container bodies. . The protective coating materials 50 and 52 used in combination with the thermoplastic adhesive are epoxy-phenolic resin paints or epoxy-amino resin paints for the inner surface of the metal lid, and for the inner and outer surfaces of the metal container body. It is a vinyl chloride-vinyl acetate copolymer resin paint applied over an epoxy-phenolic resin paint or an epoxy-amino resin base paint, and is used with a lubricating compound for the inner and outer surfaces of the composite container body. It is an epoxy-phenolic resin paint or an epoxy-amino resin paint. All of these coating materials are commonly used in industry to protect container materials from corrosion. The epoxy-amino resin paints include epoxy urea resin paints and epoxy-melamine resin paints. Lubricating compounds used in coating composite containers have the specific purpose of improving lubrication between the container body being formed and the mandrel on which it is formed.

Adhesives based on ethylene-vinyl acetate terpolymers are ethylene-vinyl acetate terpolymers 6
2 by mixing 5 parts by weight and 35 parts by weight of polyterpene resin and heating a solvent such as an aromatic petroleum hydrocarbon.
00 parts by weight.

When this solution is cooled, it becomes a hard gel and can be stored in this state until use. When this adhesive is to be applied, it must be reheated to approximately 150°F and applied to the annular groove 36 of the lid 16 or the vertical edge 38 of the container body 12 before applying the adhesive. Heat to 4°C (200'F) to remove solvent. The lid or container body coated with adhesive can be stored until ready for bonding, at which time the adhesive properties of the adhesive are restored by heating to 149 DEG C. (300 DEG F.). Once the adhesive has regained its adhesive properties, the lid can be bonded to the container body. The ethylene-vinyl acetate-organic acid terpolymer is preferably made from a material containing 2% by weight of vinyl acetate and having an acid value of 6. A suitable terpolymer of this type is manufactured by DuPont and is commercially available under the trade name EP-3656-9. Adhesives based on bulk-polymerized butadiene-styrene copolymers are made by bulk-polymerizing copolymers of 2% by weight of styrene molecules and 7% by weight of butadiene molecules. -Polymer 567
1 part by weight contains 21.2 parts of polyterpene resin, 21.2 parts of coumaron-indene resin, and 0.0 parts of antioxidant.
85 parts by weight.

This composition is dissolved in 200 parts by weight of a heated solvent such as a petroleum-based aromatic hydrocarbon. The viscosity increases slightly as the solution cools and no reheating is required for application. As with adhesives based on ethylene-vinyl acetate terpolymers, they can be stored until use, and the application methods and results are also similar. Examples of commercially available bulk butadiene-styrene copolymers suitable for such use include the Shell Chemical Company under the trade names KratOn 1101 and 1102. Adhesives based on polyamide-based polymers have a melt index of 6 to 15 for 205 agent C (401 agent F), and are soluble in solvents, such as polyamide 75, which needs to be maintained in a solution state at room temperature. 25 parts by weight of polyterpene resin.

This composition contains 2 (4) parts by weight of a petroleum-based aromatic hydrocarbon,
Dissolve in a heated solvent consisting of 6 parts of acetone-free diacetone alcohol and 6 parts of isopropyl alcohol. The solvent J is heated to about 150'F to fully dissolve each component. When the resulting adhesive is cooled to room temperature, it does not lose its homogeneous solution state;
Apply as is at any time and heat to remove the solvent. Next, apply this adhesive to approximately 205°C (400'F).
) to restore adhesion and attach the lid to the container body. Examples of commercially available polyamides suitable for such purposes include the trade names Milvex 1000 and Milvex 4000 manufactured by General Mills Corporation. As can be clearly seen in FIG. 2, the adhesive 40 completely protects the uncoated end 54 of the vertical edge 38 of the container body 12, and this adhesive 40 completely protects the uncoated end 54 of the vertical edge 38 of the container body 12. Any contents that may corrode the material or, in the case of a composite container body, that may cause deterioration due to contact with the core material, should not be present at the end 5.
It should be noted that there is no contact with 4.

It will be appreciated that the foregoing general details are merely illustrative of the invention and should not be construed as limiting the scope of the claims.

[Brief explanation of the drawing]

1 is a perspective view of an exemplary container according to the present invention, and FIG. 2 is an enlarged partial cross-sectional view of the container taken along line 2--2 of FIG. In the figure, 10 is a container, 12 is a container body, 16, 18 are lids, 20, 22 are end seams, 24 is a central closure part of the lid,
26 is a reinforcing annular groove, 30 is an inner vertical wall, 32 is a flange, 34 is an outer vertical wall, 36 is an annular groove that surrounds the periphery of the central closing part and opens toward the container body, and 38 is an opening in the container body. At the vertical end of the side, 40 is an adhesive, and 50, 52 is a covering material.

Claims (1)

[Scope of Claims] 1. A metal lid whose inner surface is coated with an epoxy-phenol resin paint or an epoxy-amino resin paint, and a metal container body or body whose inner and outer surfaces are coated with a vinyl chloride-vinyl acetate copolymer resin paint. In a pressurized liquid container consisting of a composite container body whose inner and outer surfaces are coated with epoxy-phenolic resin paint or epoxy-amino resin paint, the metal lid surrounds the periphery of the central closing part and opens toward the container body. The inner and outer vertical walls are connected via flanges to form an annular groove, and the opening side vertical end of the container body is inserted into the annular groove to form the annular groove. The inner surface of each vertical wall and the vertical end are bonded to each other with a thermoplastic adhesive, the thermoplastic adhesive having an adhesive strength that can withstand the internal pressure of the container generated from the pressurized liquid; (a) acetic acid; (b) whether it is an adhesive containing 20% by volume of vinyl and a mixture of 65 parts by weight of an ethylene-vinyl acetate-organic acid terpolymer with an acid value of 6 and 35 parts by weight of a polyterpene resin;
56 parts by weight of a copolymer block-polymerized from 25% by weight of styrene molecules and 75% by volume of butadiene molecules, 21 parts by weight of polyterpene resin, and 21 parts by weight of chroman-indene resin.
or (c) an adhesive that is a mixture of 75 parts by weight of a polyamide with a melt index of 6 to 15 at 205°C and 25 parts by weight of a polyterpene resin. . A pressurized liquid container characterized by: