Process to form a pressure release hole with removable seal, for easy opening, on metal lids for vacuum sealing of glasses and other glass containers used to pack foodstuff

• US 5,275,679 A
• Filed: 05/26/1992
• Issued: 01/04/1994
• Est. Priority Date: 09/10/1991
• Status: Expired due to Term

• Current Assignee: Metalgrafica Rojek LTDA
• Original Assignee: Metalgrafica Rojek LTDA
• Inventors: Rojek, Arnaldo
• Primary Examiner(s): Ryan, Patrick J.
• Assistant Examiner(s): DIXON, MERRICK L
• Application Number:
  US07/888,175
• Time in Patent Office: 588 Days
• Field of Search: 156/250, 156/69, 156/214, 156/293, 156/303.1, 264/248, 264/294, 264/106, 264/154, 264/268, 426/87, 426/401, 83/108, 83/103, 83/100, 83/31, 83/25
• US Class Current: 156/250
• CPC Class Codes: B29C 65/60 Riveting or staking
• CPC Class Codes: B29C 65/606 the rivets being integral with one of the parts to be joined, i.e. staking
• CPC Class Codes: B29C 66/5344 said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends B29C66/5346 takes precedence
• CPC Class Codes: B29C 66/542 joining hollow covers or hollow bottoms to open ends of container bodies
• CPC Class Codes: B29C 66/545 one hollow-preform being placed inside the other
• CPC Class Codes: B29C 66/55 sealing elements being incorporated into the joints, e.g. gaskets B29C66/52296 takes precedence
• CPC Class Codes: B65B 51/02 Applying adhesives or sealing liquids
• CPC Class Codes: B65D 51/1677 by rupturing a portion of the closure
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing
• CPC Class Codes: Y10T 428/214 End closure
• CPC Class Codes: Y10T 428/218 Aperture containing
• CPC Class Codes: Y10T 83/0457 By retaining or reinserting product in workpiece
• CPC Class Codes: Y10T 83/207 By suction means
• CPC Class Codes: Y10T 83/2079 Remaining or re-inserted product portion from base material
• CPC Class Codes: Y10T 83/209 Including means to replace product in base material after cutting

Abstract

A a lid for sealing a container. The lid adheres to the container by no more than a vacuum formed within the container. The lid is formed of a substantially circular panel having a flanged perimeter and a concave depression on an upper side of the circular panel. A pressure release hole extends through the concave depression of the circular panel and sanitary varnish is disposed on a lower side of the circular panel. A first adhesive material is applied to the lower side of the lid by fusion to the sanitary varnish to form a thin film over the release hole, and a second adhesive material is disposed in the concave depression on the upper side of the lid to form a removable seal. The second adhesive material has the same properties as the first adhesive material.

Claims

1. A process of forming a lid for vacuum sealing a container, the lid adhering to the container by no more than a vacuum formed within the container, the process comprising the steps of:

disposing a concave depression on an upper side of a substantially circular panel having a flanged perimeter;

disposing a sanitary varnish on a lower side of the circular panel;

forming a pressure release hole extending through the concave depression of the circular panel;

applying a first adhesive material to the lower side of the circular panel by fusion to the sanitary varnish to form a thin film over the release hole; and

depositing a second adhesive material in the concave depression on the upper side of the circular panel to form a removable seal, the second adhesive material having the same properties as the first adhesive material.

2. The process as claimed in claim 1, wherein the adhesive material is plastisol.

3. The process of claim 1, wherein the first and second adhesive materials are a vulcanized resin applied in a liquid state that solidifies and adheres to the circular panel and the first and second adhesive materials melt together to form a unitary seal.