Formed piece particularly for use as packing material method and

Details Formed piece particularly for use as packing material method and Formed piece particularly for use as packing material method and

1995-09-25

1997-12-16

Watkins, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428154, 428155, 428124, 428906, 428 342, 493452, 493395, 493405, 493356, 497967, 497407, 206584, 206814, B31D 500, B65D 8109

Patent

active

056982933

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a formed piece particularly for use as packing material.
As to the prior art, reference is made generally to the publications U.S. Pat. No. 4,237,776, U.S. Pat. No. 3,799,039, U.S. Pat. No. 3,509,798 and WO 92/05948, from which a formed piece is known. According to techniques disclosed in these publications, it is possible to manufacture packing materials of plate form.
It is also known in the prior art to manufacture of cellular polystyrene which are commonly used as packing material in transport and storage of products in industry and trades, such as mail-order businesses. Form pieces made of cellular polystyrene are light-weight, flexible and easy to use. They are cheap to manufacture on an industrial scale, because a relatively cheap series mold can be used. Also, most form pieces can be recycled.
However there are a number of disadvantages to the above form pieces. For example, form pieces of cellular polystyrene charge static electricity, for this reason their use is not recommended in certain applications. In addition, static electricity makes it more difficult to handle the form pieces. Cellular polystyrene is an oil-based material which, after the cycle of consumption of the form pieces, burdens dumping grounds. In other words, the disposal of form pieces is an environmental problem. It should further be noted that their manufacture is relatively energy-consuming.


SUMMARY OF THE INVENTION

The purpose of this invention is to present a new form piece for use as packing material, whereby a great deal of the above-mentioned problems can be eliminated. To achieve these aims, the form piece of the invention comprises type, and gap is provided between at least some sheet material layers or the like, for at least part of the length of the form pieces.
A form piece arranged in the above-mentioned manner is manufactured of a sheet material, which in this context means particularly decomposable sheet materials, such as paper and/or plastic polymer materials manufactured and/or treated so that they are decomposable. In particular, cellulose-based materials, recycled and/or waste paper can be used. Cellulose-based sheet materials, i.e. those manufactured of paper, are advantageous because they can be recycled by waste paper collection or disposed of by burning or composting. Form pieces of particularly cellulose-based materials do not charge static electricity, so they are easier to use in this respect than form pieces made of cellular polystyrene. Using suitably chosen cellulose-based materials, a form piece according to the invention competes very well in price and functional properties (price/quality ratio) with form pieces of cellular polystyrene currently in use.
When form pieces according to the invention are used as packing material, the surface, wrinkled or treated by working the sheet material in a corresponding manner, induces good internal friction in the packing material and even creates partial mechanical adhesion of form pieces to each other, whereby a product packed by the packing material is kept in position during transportation and storage and does not displace the packing material and sink to the bottom of the package space which might cause a risk of damaging the product because the outer surface of the product is in direct contact with the inner surface of the package without a protective zone provided by the packing material.
The present invention relates also to a method for manufacturing form pieces, particularly for use as packing material, on an industrial scale. The method of the invention is primarily characterized in that a bar-like blank is twisted around its longitudinal axis before cutting it into form pieces (M) of certain length.
With the method presented above, it is possible to manufacture form pieces on an industrial scale by continuous production, naturally within limits determined by the length of the continuous web. In particular, reducing the width of the web or the like, i.e. the dimension transverse to its runni

REFERENCES:
patent: 3509798 (1970-05-01), Johnson
patent: 3650877 (1972-03-01), Johnson
patent: 3799039 (1974-03-01), Johnson
patent: 4109040 (1978-08-01), Ottaviano
patent: 4237776 (1980-12-01), Ottaviano
patent: 4247289 (1981-01-01), McCabe
patent: 5181614 (1993-01-01), Watts
patent: 5468525 (1995-11-01), Watts
patent: 5538778 (1996-07-01), Hurwitz et al.

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