Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Patent
1996-05-09
1998-03-10
Dye, Rena
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
428 367, 428346, 229 31, 229 35R, 156 69, B65D 556, B65D 552
Patent
active
057259186
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A wide variety of single-use type packaging materials are known, the so-called disposable cartons. Many of said packaging materials are in the form of multilayers comprising different materials in order that the composite material may present a desired combination of properties otherwise not available from a single layer of a single composition.
For packaging cartons, known multilayers generally comprise at least one stiffening layer, such as cardboard, which also reliably retains scores and folds therein. The other layers can be variably chosen in function of the protection needed for the contained material. In particular, for dry laundry compounds, which sometimes are moisture sensitive compositions, the disposable cartons consist of a multilayer material comprising generally an aluminum foil coated to cardboard or paper.
The disposable cartons comprising a layer of aluminum foil possess extremely barrier properties. However, this type of multilayers is becoming more and more controversial from the environmental viewpoint.
Consequently, the packaging technology has long been in need of being able to develop an aluminum-free packaging material, that uses materials offering high barrier characteristics, but conferring greater environmental advantages to the multilayer material.
From CH-A5-610 570 it is known that ethylene vinyl alcohol copolymer (abbreviated as EVOH) or mixtures of EVOH with other thermoplastic polymers is a good barrier material for gases in general, oxygen in particular. This material is directly used to preserve liquids or foods in general.
Various multilayer materials comprising EVOH and mixtures thereof have been described in EP-A-245 921, Gibbsons et al., published Nov. 19, 1987; EP-A-423 511, Lofgren et al., published Apr. 24, 1991; WO92/01558, Flom, Atle, published Feb. 6, 1992. The containers formed by these multilayer materials present several layers to achieve different protection of the contained material, from an oxygen barrier to a flavour barrier, always comprising at least a stiffening layer made of cardboard or paper. The EVOH or other thermoplastic polymers are laminated always as one of the outermost layers.
The multilayer materials of this prior art needs special assembling techniques, such as heat sealing or hot melts, to be formed into cartons. In this operation, different parts of said material must be assembled. If the parts, which have to be bonded together, consist of EVOH or mixtures thereof or of other thermoplastic polymers, the carton cannot be simply glued together, but needs, as said before, sophisticated assembling techniques.
It is an object of the present invention to provide a multilayer material, which allows to form packing containers for dry compounds, such as dry laundry compositions, on machines using only glues as adhesives, and nevertheless present a high barrier to moisture permeation and prevent the migration through said material of greasy compounds using an EVOH layer.
It is yet another independent object of the present invention to provide a process allowing for the manufacture of the packaging container from said multilayer material. These and other objectives will become more apparent in the following description of the invention.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 schematically illustrates the transverse structure of the preferred embodiment of the multilayer material according to the present invention: the ethylene vinyl alcohol copolymer (EVOH) layer is first sandwiched between two tie layers and then sandwiched again between two cardboard or paper layers.
FIG. 2 and 3 show possible modifications of the corresponding transverse structure of the multilayer material. In FIG. 2 only one tie layer is used, whereas in FIG. 3 the EVOH layer is directly attached between two cardboard or paper layers.
FIG. 4 schematically illustrates the preferred embodiment of the packaging container made of one blank composed of said multilayer material.
SUMMARY OF THE INVENTION
The present invention is a multilayer mate
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Dye Rena
Kock Ronald W.
The Procter & Gamble & Company
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