Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1995-11-28
1998-03-31
Loney, Donald
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156193, 156194, 156196, 156205, 264287, 493407, 493463, 493464, 493967, B31F 122
Patent
active
057334030
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a product packaging material and method, and in particular to a product packaging material formed from a length of rolled corrugated paper and a method of manufacture therefor.
BACKGROUND TO THE INVENTION
Many products need to be stored and/or transported in packaging materials selected to provide impact cushioning.
Environmental concerns today are resulting in the buyers, specifiers and/or designers of packaging products demanding cushioning materials that have as small an effect as possible on diminishing fossil fuel reserves and on increasingly overloaded landfill waste disposal sites; consequently materials manufactured from recycled waste materials, and which are themselves recyclable, are increasingly demanded.
Corrugated paper meets the requirement for a recyclable packaging material, which often can also be re-used. Typically "single-faced" corrugated paper is used i.e. with a planar paper sheet having affixed to one side a sinusoidal corrugated sheet. Corrugated board is also available i.e. with the sinusoidal corrugated sheet sandwiched between two planar sheets. Often the corrugated paper is used in multi-layer form. Corrugated paper is not however usually recommended for cushioning applications such as may be required for the packaging of highly fragile products such as certain optical instruments and computer floppy disc drives.
DISCLOSURE OF THE PRIOR ART
Polyethylene foams are known for packaging optical equipment and computer floppy disc drives. This material is however petroleum based, using scarce and unrenewable resources. After use it is difficult to discard in a manner of little detriment to the environment; often it is simply buried.
Paper, being wood based, can be recycled. Corrugated paper is usually made from recycled waste paper, and is also itself recyclable. The corrugated paper can be formed into a variety of suitable shapes; the required form imposed by the manufacturer can be retained (at least until the formed product is ready for use by the packager) by the use of a suitable adhesive.
SUMMARY OF THE INVENTION
The applicants have sought to modify the properties of corrugated paper, single-faced or board, and when in multi-layer form, to permit its use as a material with increased cushioning properties.
As one feature of the invention the applicants therefore provide a modified corrugated paper, in which the corrugations are no longer sinusoidal. Usefully the corrugations are of a crushed or tilted form, though they are still present i.e. the "crushing" is not so severe as to flatten the corrugations in the finished (marketed) material, but is sufficiently severe to remove (destroy) the inherent strength of the sinusoidal form of the corrugations.
The applicants developed the invention from the realisation that the internal fibrous structure of the material from which the corrugated paper is formed provides the resilience needed for restoring the corrugated paper after an impact, so that it is ready to withstand another impact; yet recognised also that the sinusoidal form into which the material is traditionally corrugated has too high a deformation modulus i.e. it does not yield or deform sufficiently under low force applications, and so acts effectively as a "solid wall" against which a packaged product is required to "bounce", rather than as a cushion able to absorb product movements (and being resilient also to return to or nearly to its original condition after absorbing an impact).
Delicate instruments in particular need to be gently cushioned, with the packaging material (a) of a structure to yield to absorb an impact and (b) of a composition to return towards its original condition.
Thus according to a further feature of the invention we provide a product packaging material comprising corrugated paper, the corrugated paper including non-sinusoidal corrugations.
According to another feature of the invention we provide a method of making a packaging material which includes the steps of forming corrugated paper h
REFERENCES:
patent: 479999 (1892-08-01), Thompson
patent: 2314876 (1943-03-01), Greene
patent: 3616135 (1971-10-01), Tesainer et al.
Aston Packaging Limited
Cota Albert O.
Loney Donald
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