DE1586288A1 - Method for closing sterilizable containers, as well as containers suitable for this - Google Patents

Description

• MONCHCH IS. tltOItSTNAtaCt ·. TSLIFONMMtT · TILIQRAMM-ADRIttEi INVCNT / MONCHEN

April 7, 1967

C 604 + a

SCHWEIZERISCHE ALUMINUM AG., Chippie, Switzerland

"Procedure for closing τοη sterilizable containers as well as suitable containers ¹ *

Priority! April 7, 1966, Switzerland registration no .: 5163/66

It is known to re-manufacture all types of packaging, such as bags, cans and wrappings, by heat sealing. In this case, the packaging material, which consists of a thermoplastic or is coated with such a plastic, is welded at the point of the seam by applying pressure and warning. When using "τοη it a ^ hermoplaeten coated packaging film is important for proper closure that both of the mutually facing sides of the packaging film with dom! Thermoplastics are coated ee" Only in a few cases when a welding low strength is sufficient _f, it is possible to use a to seal coated to uncoated material.

BATH

Known also bind cans made of polyethylene coated Aluminum foil is deep-sucked and sealed with a roll of deodorant also covered with old polyethylene, whereby the Cover film on an outwardly directed edge flange dt The lower part of the can is sealed.

However, all of this packaging is not very suitable for filling goods, especially foods that are subjected to high temperature sterilization because of the thermoplastic soles are not sufficiently sensitive to the effects of the sterilization temperatures. Sterilization-proof cans are covered on the inside with a stoving varnish, ie a duroh stoving hardened plastic. These cans are sealed by flanging the old lid under the edge of the can Intermediate layer of a sealing compound, usually based on rubber.

The present invention relates to a method sum of closing sterilizable metal containers on their ■ The inside is coated with a plastic hardened by baking. According to the invention is also with a hardened plastic-coated lid with the aid of a thermoplastic material on an edge flange of the container with the application of heat and pressure, with the sides of the lid and the hardened plastic coated ■ containers are facing each other.

As thermoplastics come for heat sealing Polyolefins, e.g. polyethylene, vinyl resins and polyamides are possible. A copolymer made of ethylene has proven to be particularly suitable

009832/0446

and vinyl acetate with one. Vinyl acetate content - proven to be 18-40 #, which adheres well to stoving enamels. The thermoplastic can be brewed by applying a solution with aneohli-easy drying or the molten mass, e.g. by spraying. It can be applied to both parts to be welded, ie to the flange of the container and the edge of the lid, but preferably only a part, eB the lid j applied. In this case, the heating during sealing preferably only takes place from the uncoated side,

Ee is also possible to work ssu without previous application of the Heiasiegelmasse and awar so daos same immediately before the Yerechliessen the container in the form of a dog wire from, EB OFQ "1.2 na diameter or a Hinges with rectangular cross-section vcn eg 0, 05 0.50 mn thick and 3.0 0.5 min wide between the sealing rims (puddles) of the container

and lid is placed. The interconnection takes place in a known manner by applying pressure and heat «

The thermoplastics used for sealing can usually contain certain amounts of resins, plasticizers, stabilizers? Wax and paraffin are added.

The known stoving lacquers, eg * based on phenolic and / or epoxy resin, can be used to coat the container with a hardenable plastic.

009832 / 044S BADORiGlNAL

example 1

An aluminum tape γοη 0.1 mm was painted with a conventional can paint (epoxy-modified phenolic resin) and baked. The coating thickness was 5-7 / 1000 mm. A container 1 was produced from this material by deep drawing and a lid 2 was punched out.

At the edge DEB lid on the paint side XyIol solution was applied a Oopolymerisates from iithylen and vinyl acetate with a content of 28 $> of the latter, and dried in hot air ,, so that a coating 4 of 20O400 / 1000 mm thickness was created (Fig * l ) o This lid was welded onto the surface 3 of the container 1, specifically at a mold temperature

O 2

from 200 - 230 C, a specific pressure of 30 Kp / cm and a holding time of 2 seconds. Better results were achieved if the heat was only supplied from below, from the side of the flange 3 of the container. The thus-sealed container (FIG. 3) was sterilized for 30 min at 121 ⁰ C and anachliessend the strength of the seal has been tested by drilling the container and prints. The container did not burst until the internal pressure was 2.5-3.5 atti.

Example 2

The container and lid were made as in Example 1, however not coated with heat sealing compound, this was rather in Fora a wire 5 of 1.2 mm diameter between cover 2 and brought container flange 3 (Fig. 2).

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- ■■ * "V 1 5S6288

_{; ί} sealing temperature, · »the bridge and tent were chosen the same, with the warming up from both sides»

The. Testing of the container (Pig. 3) was carried out in the example 1 described manner and showed the same result.

Claims

BATH

009832/0446

Claims (1)

Patent a η a ρ rü che 1". Method for closing sterillable metal containers with a through Burn-in hardened plastic are coated, thereby marked? that the lid, which is also coated with a hardened plastic, is attached to an edge flange of the container with the aid of a thermoplastic is sealed using pressure and V / arms, the the sides of the lid and container coated with the hardened plastic are facing each other « 2 β method according to claim 1 »characterized in that the thermoplastic is a copolymer of ethylene and vinyl acetate with a vinyl acetate content of $ 18-40. 3ο Method according to claim 1 or 2 _V, characterized in that the! Thermoplastic is only applied to one of the parts to be sealed together. 4. The method according to claim 3> characterized in that that the heat is only supplied from the side not coated with thermoplastic during sealing from here « 5 ο Method according to claim 1 to 4, characterized in that the thermoplastic is in the form of a Hinges «wipe the parts to be sealed is placed. 009832/04 46 6. St.erili8ieri; Äiitger container with lid made of metal _r ins · = ·· besöii ^ d |?:, E .. wa ^ Alumnium? Λ aby ge k-. e η η ζ ei ο h η. e / _f t.-4as0. the inside of the container (1) and lid (2) with. - coated a _v genärteten by baking Kunststofi ¹ eats yji4 ,, -, da9ssicji between the hand flange (3) of the container (l) ^^ d-Deia; Deq] tel (2) a layer aua a thermoplastic ν Acheri ^ unststofi-is . 7. Sterilizable container according to claim 6 _r characterized by the fact that the thermoplaetisc.hei plastic has the shape of a round wire of preferably 0.8 - 1.2. cm. diameter has: 8. Sterilizable container according to claim 6, since " durchgeke η η ζ eich η et _f that the thermoplastic plastic. the shape of a Hinges with a rectangular cut, of. preferably white 0.05 · 0.50 cm thick and 3 "C ~ 0.5 nm wide" 6AD ORIGINAL Blank page