LU88074A1 - ANNUAL PLASTIC CHUCKS - Google Patents

Description

PATENT APPLICATION

In venteurs: STEPHEN KLEYKAMP PATRIC MICH ELIS

Title: ANNEL PLASTIC CHUCKS

The following text describes a new plastic mandrel which could replace the existing mandrel on the market which is based on cardboard or plastic.

Ll sketch I shows the cross section of this corrugated mandrel (1) which consists of a corrugated tube (2) (either double skin or single skin) and a smooth tube outside (3).

The inner corrugated tube brings lightness and rigidity which give the new plastic mandrel its resistance to crushing during the winding of materials on the mandrel itself. The outer tube acts as a skin and forms a smooth surface between the corrugated tube and the material to be wound.

EXISTING TECHNOLOGY

The mandrels which are currently used in the packaging industry are currently produced on the basis of cardboard or plastic, but both solutions present environmental problems or are too costly. 1) Cardboard cores. The cardboard cores that currently exist are produced by successively winding several layers of glued paper strips. Before these layers of paper overlap, they are spirally wound on top of each other. This paper core is probably the most popular solution in the packaging industry, since the paper raw material is the least expensive and the resulting finished product is rigid enough to make a core. with a center strong enough to later roll up the required material on top. Disadvantages of the cardboard core:

Cardboard cores present technical and environmental problems. Due to the rigidity of the glued cardboard, the edges of the mandrel are easily damaged during handling. In addition, the cores must be stored in places where humidity is constantly controllable, because the dimensions of the cardboard core can fluctuate due to the change in humidity. These two problems cause a high fall for the consumer who is forced to abandon a good part of his chucks before being able. use them for the winding of its products.

Damaged cardboard cores, as well as those rejected by the end consumer after use, can cause environmental problems. Most of the glues used to fix the paper layers are not soluble in water, which means that these cardboard cores are practically not recyclable. Even soluble adhesives can destroy the cardboard making it very difficult to use the cardboard.

These technical and environmental problems could be solved by using the plastic mandrel. 2) Plastic mandrels. Plastic mandrels are manufactured using known techniques for the extrusion of plastic pipes. A plastic mandrel has fewer technical problems than that of cardboard and from an environmental point of view it is possible to use a raw material, such as polyethylene, polypropylene or many other plastic materials which can be easily recycled.

By the use of plastic, the plastic mandrels cannot be damaged at the edges thanks to the advantage of the elasticity of the plastic vis-à-vis the stiffness of the cardboard. So they can better absorb the blows during handling. Most of the existing plastic mandrels show only a slight or even no change in size caused by the change in humidity. Plastic mandrels can be stored outside with the advantage of limiting storage costs, while cardboard mandrels must be stored inside.

These technical advantages of plastic cores over cardboard cores allow them to be reused several times or to be recycled into plastic granules for the manufacture of other products.

Another major disadvantage vis-à-vis cardboard cores is the plastic cores currently used: cost. Typical plastic chucks are more expensive than cardboard chucks because plastic is normally a more expensive raw material than cardboard.

To meet the same requirements of cardboard cores, the plastic cores currently used must be very thick to resist the weight of the product to be wound on the mandrel. The unique combination of the corrugated tube with the smooth tube, which brings us to the plastic corrugated mandrel, solves the problem of the cost of the ordinary mandrel vis-à-vis the cardboard mandrel. The corrugated mandrel weighs and costs about half of an ordinary plastic mandrel made entirely of plastic. This means that a plastic mandrel retains all the advantages of an ordinary plastic mandrel compared to a cardboard mandrel and, in addition, the lightness of the finished product leads to a cost similar to that of the mandrel / cardboard.

Although the single-walled or double-walled corrugated tube and the smooth tube are known products and have been in use for many years, it is this only combination of the two known products that could be patented. The ringed tube is known to be light, but also solid, thanks to its ringed shape: an ordinary tube should be twice as heavy as the ringed tube to have the same rigidity.

Claims (7)

The outer skin can be a smooth tube, made separately from the annular tube and subsequently joined together to have an annular mandrel. The two components, annealed on the inside and smooth on the outside could be manufactured with special equipment allowing production in a simultaneous and continuous manner. The purpose of this patent application is the description of the corrugated mandrel, regardless of the choice of production method and regardless of the type of plastic. Corrugated and smooth walls can be manufactured thick or thin and in any diameter required. With this text we do not intend to highlight the different profiles. PATENT CLAIMS The plastic ringed mandrel has the following claims: 1) It claims the combination of two well-known products: the ringed tube and the smooth tube, which gives us a new plastic ringed mandrel providing advantages over the mandrels existing and made from plastic or cardboard. 2) In addition to claim 1, the corrugated plastic core resists damage that can occur on both edges during handling, which results in less fall than for the cardboard core 3) In addition to claims 1 and 2 , the corrugated plastic mandrel is, thanks to the choice of its raw material, less sensitive to fluctuations in its dimensions, caused by changes in humidity than cardboard mandrels. 4) In addition to claims 1, 2 and 3, the plastic ring core can be reused or recycled like ordinary plastic tubes while the cardboard core often contains substances which are difficult to recycle. 5) In addition to claims 1, 2, 3 and 4, the annular plastic mandrel weighs, thanks to the annular tube inside which brings its lightness and solidity, about half the weight that an ordinary mandrel in plastic with the same mechanical rigidity. 6) In addition to claims 1, 2, 3, 4 and 5, the plastic annular mandrel is not distinguished, thanks to the combination of its light components, not only by the technical and environmental advantages of the ordinary plastic mandrel, but also by its cost which is roughly equivalent to that of the cardboard core. 7) In addition to claims 1, 2, 3, 4, 5 and 6, the new plastic annular mandrel will revolutionize the packaging industry by aligning the price of the plastic mandrel with the cost of the cardboard, which Up to now, the high-quality plastic mandrel has been prevented from replacing the cardboard mandrel which is of a lower quality.