Manufacturing container or tube from paper; or other manufacturi – Tube making – Spiral winding
Patent
1998-04-08
2000-08-22
Johnson, Brian L.
Manufacturing container or tube from paper; or other manufacturi
Tube making
Spiral winding
493274, 493288, 493295, 493297, 493302, B31C 108, B31C 1300, B31C 106, B31C 1102, B31C 1106
Patent
active
061064513
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a method for the production of tubes out of paper board, cardboard or similar material, hereafter called cardboard tubes, with rectangular cross section, as well as a device for its production.
DESCRIPTION OF THE BACKGROUND ART
Pallets of varying configurations and in varying materials have long been used in the loading of goods for forwarding by various types of transport. The most common material is and has been wood, a robust material of which a pallet can be produced relatively easily. Wooden pallets are however comparatively heavy, which limits the useful load e.g. for a lorry. Wooden pallets have other disadvantages as well. They have a tendency to absorb moisture, which makes them even heavier as well as discouraging the loading of moisture-sensitive goods such as flour. They are also difficult to clean due to pores and cavities in the wood. They can also contain insects and other creeping creatures, which altogether make them unsuitable from a hygienic point of view. Regarding these considerations as well as environmental considerations, other materials have been brought forth such as paper and cardboard, which are wound into tubing with a number of layers that are joined together with suitable adhesive. In this way a significantly lighter and less expensive construction of the pallet is obtained, with added advantages such as the use of waste material, better hygiene and a pallet that is 100% recyclable.
The problem up to now has been that no one has proposed an optimal construction for strength, stiffness and simplicity in the production of tubes in a pallet made of paper or cardboard. SE-B-459 251 for instance describes a pallet made of a number of base parts in the form of square tubes made of several layers of paper or cardboard. The description gives no information regarding how the layers are joined to each other or how the pallet is treated to withstand moisture. CH-486 376 describes a pallet with three longitudinal base units and a loading deck on these. All components consist of paper wound in several layers, however with a circular form which significantly decreases the possibility of joining these with each other, and which has a detrimental effect on the strength and stiffness of the pallet. Neither does this document deal with the joining of the layers in the tubes.
As to the joining of layers and the moisture resistance of the final product, it is generally so that before winding, the cardboard layers must be treated with suitable media so that they will stick to each other and give the desired strength and in certain cases moisture-protection so that the board does not become damp.
DESCRIPTION OF THE INVENTION
The objective of the present invention is to obtain a simple and effective method for the production of board tubing contained in for example pallets where the starting material does not need treatment before production, the tubes are not treated after production and where preferably waste material from an other industry can be used.
This objective is achieved according to one aspect of the invention by a method for production of board tubes with rectangular cross section, characterized in that layers of cardboard coated with thermoplastic are heated and joined to each other by winding in spiral around a rectangular core during formation of the tube.
According to one aspect of the invention, a device is obtained for achievement of the method, characterized in that it includes a first means for heating of a number of layers of cardboard coated with a thermoplastic as well as a second means for winding and forming of the heated layers to tubing.
According to another aspect of the invention, the means for winding includes an elongated core with rectangular cross section as well as a driving means for rotating the core, by which the heated layers are wound onto the core.
According to a further aspect of the invention, a pallet is obtained produced of tubing which in turn is produced according to the method, characterized i
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Johnson Brian L.
Luby Matthew
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