Container closure
AssigneeIllinois Tool Works Inc.
InventorsDavid John O'Brien, Victor Sachs, Joseph Smelko, Robert william Thorstensen-Woll
Life of this patent
Estimating the term…
Abstract
A one-component seal and wadding system (1) for a screw-cap includes a seal (3) having lower layers (4,5) forming an induction heating sealable system for attaching the seal (3) to the neck of a container, a seal substrate (6) including a free tab (50) lying wholly within the circumference of the seal, a layer of liner (2), and attachment means (10,11,12) including a release layer (11) for attaching the seal substrate (7) including the tab (50) to the wadding (2).
Claims44
A one-component seal and liner (1) for a screw-cap including a seal (3) having lower layers (4,5) forming an induction heating sealable system for attaching the seal (3) to the neck of a container, a seal substrate (6) including a free tab (50) lying wholly within the circumference of the seal, a layer of liner (2), and attachment means (10,11,12) including a release layer (11) for attaching the seal substrate (7) including the tab (50) to the liner (2).
Method of manufacture of a vessel closing assembly for adhesion into a screw cap in which a liner laminate comprising a substrate layer (26) and a layer of stiff film (24) on at least one side of the substrate layer (26), having an attachment surface for attachment to the seal laminate (3), is attached to a seal laminate (3) comprising induction heat sealable layers (4,5) for sealing at one side to a container and comprises at least one stiff film layer (24), and an attachment surface at the other side whereby the attachment surface of the seal laminate faces the side of the liner laminate (2) formed by the stiff film (24), the joining involving the steps of:
- providing a release surface (23) on one of the attachment surfaces;
- applying a pressure sensitive adhesive composition (22), from a liquid composition to one of the attachment surfaces and drying the composition to leave an adhesive coating;
- and
- contacting the attachment surfaces to adhere the liner laminate (2) to the seal laminate (3).
The method according to any preceding claim in which the thickness of the stiff film (24) is in the range 8.0 to 40 μm.
A vessel closing assembly (1) for adhesion into a screw cap including a seal laminate (3) having lower layers (4,5) which form an induction heating sealable system for attaching the seal (3) to the neck of a container and an attachment surface at its top, a layer of a rubbery pressure sensitive adhesive (22) coated on said attachment surface of the seal laminate (3) with a coating weight in the range 3 to 6 g/m2, a release layer (23) and a stiff film layer (24) wherein the stiff film (24) has a thickness in the range 8 to 40 μm and the release layer (23) is adhered between the upper surface of the adhesive layer (22) and the lower surface of the stiff film layer (24), and a foamed thermoplastics liner (26) with a thickness in the range 0.4 to 1.1 mm and a density in the range 250 to 500 g/l attached to the upper surface of the stiff film wherein:
- the peel strength of the attachment surface at the release layer (23) is in the range 20 to 90 g/25 mm.
Dependencies are inferred from the claim text.