Envelope having a closing flap, method and machine for manufacturing such an envelope
AssigneeHolweg Group
InventorCédric Ritondo
Life of this patent
Estimating the term…
Abstract
An envelope formed from a sheet of flexible material and including: a lower section, an upper section superposed on the lower section, the sections being joined together by lateral edges, leaving an opening between the lateral edges, a protective strip on a layer of closing adhesive, the layer of closing adhesive being intended to ring about the closure of the envelope after the protective strip has been removed, and at least one precut region that is able to be detached from the envelope, the protective strip and the layer of closure adhesive extending at least partially over the precut region. Associated method and production machine.
Claims22
An envelope formed by at least one sheet of flexible material and comprising:
- a lower flap,
- an upper flap superposed over the lower flap, the flaps being joined together by lateral edges leaving an opening between the lateral edges,
- at least one protection strip on one coat of closing adhesive, the coat of closing adhesive being designed to ensure the closing of the envelope after removal of the protection strip,
- along the opening, at least one precut area that can be detached from the envelope, the coat of closing adhesive extending at least partially over the precut area wherein the envelope comprises reinforced means of linking joining the precut area to the protection strip in a reinforced way with respect to the link between the protection strip and the coat of closing adhesive.
A process for manufacturing an envelope whereby:
- at least one strip of flexible material in a continuous sheet is unreeled in a longitudinal direction,
- the precut lines (191, 192, 193, 194) are marked delimiting precut areas (19) on the strip,
- closing adhesive is applied extending on both sides of the precut lines, and a protection strip which covers the coat of closing adhesive at least outside the precut areas, in such a way that the precut area is linked to the protection strip in a strengthened way with respect to the link between the protection strip and the coat of closing adhesive,
- the strip is separated into sections, and each section is closed to form an envelope as per one of the previous claims that has an opening bordered by the precut areas.
Machine A machine for manufacturing flexible envelopes, characterised by the fact it comprises comprising:
- unwinding means for unreeling at least one sheet of flexible material in a continuous sheet in a longitudinal direction,
- marking means for marking precut lines on the sheet delimiting precut areas,
- application means for applying a coat of closing adhesive at regular intervals, extending on both sides of the precut lines on the sheet, and a protection strip that covers the coat of closing adhesive at least outside the precut areas,
- separation means for separating the sheet into sections along the rear edge of the section,
- folding means for closing each section to form an envelope as per one of the previous claims with an opening along the rear edge bordered by the precut areas,
- the machine being configured to implement the process.
Dependencies are inferred from the claim text.