Paper tube with flange

Abstract

A paper tube with a flange which comprises a winding trunk outer tube 1, a flange 2 having radial cuts 3 extending radially from the central part, and a pressing inner tube 5 for mounting the flanges 2 at the ends of the winding trunk outer tube 1, these components all being made of paper, so that the pressing inner tubes 5 are inserted, through the radial cuts 3 of the flanges, into the winding trunk outer tube 1 to be tight-fitted therewith via a folding part 3a defined by the radial cuts 3, and the folding parts 3a are fixed between the outer tube 1 and inner tubes 5.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a paper tube with a flange or a projecting edge for winding around the paper tube a thin sheet material, such as paper, web and film, or a wire material, such as yarn, thread, strings, cords, tapes, hoses, electric wires, wires and chains.[0003] 2. Prior Art[0004] Bobbins, which are used for winding around the same the foregoing thin sheet materials or the wire material, are conventionally mainly made of synthetic resin or wood. The bobbin comprises a winding trunk and a "flange" integrally mounted at both ends of the winding trunk, so that any object to be wound can be wound around or on the outer peripheral surface of the winding trunk and the flanges protect the lateral edges of the wound object and arrange the same along the flanges.[0005] The bobbins made of synthetic resin have such advantages as being suitable for mass production thanks to provision by molding, having fine appearances and being light enou...

AI Technical Summary

Benefits of technology

[0023] As seen from the above, the present invention relates to a paper tube with a flange which comprises the winding trunk outer tube, the flanges having radial cuts extending radially from the center, and the pressing inner tubes for mounting the flanges at the ends of the winding trunk outer tube, these components all being made of paper, so that the pressing inner tubes are inserted, through the radial cuts of the flanges, into the winding trunk outer tube to be tight-fitted therewith via the folding parts defined by the radial cuts, and the folding parts are firmly fixed between the outer tube and the inner tubes. The present invention has the following excellent advantages.[0024] Since the winding trunk outer tube, flanges and pressing inner tubes are all made of paper, they are light in weight, thereby enabling handling the paper tube upon winding and unwinding operation to be carried out readily and conveniently. Further, merely fitting the pressing inner tubes into the hollow inside of the winding trunk outer tube provides simple assembling of the flanges, thereby making the invention simple in construction and cheap to produce.[0025] When the invention becomes unnecessary after use, they are material that can be reused as a recycled paper, contributing to protection of wooden resources and environment of the globe. In case that the material of the present invention is to be burnt, they (all made of paper) can be conveniently subjected to burning without necessity of discrimination of material.[0026] Upon assembling the paper tube, the pressing inner tubes and the winding trunk outer tube are tight-fitted through the folding parts of the flanges, so that they are strongly pressed and integrally fixed by elastic restoring force inherent in paper.[0027] Furthermore, an adhesive when applied on both of inner and outer sides of the folding parts makes higher the fixing effect, providing a rigid and strong paper tube with a flange.[0028] The winding trunk outer tube has a retaining bore for an initial end of the object to be wound, enabling ensure winding operation and long repeated use without damaging the winding trunk.

Problems solved by technology

There is another particular problem that the bobbins made of synthetic resin, which are desired to be recycled for use, are not recycled due to various undesirable social problems related to disposal of wastes these days.

The bobbins made of wood are heavy to be inconvenient in use and require much trouble and time for removing metal, such as a lot of nails applied, from the body before burning the wooden bobbins for disposal, irrespective of such convenience of being burned disposed when they become unnecessary.

There is another problem that the bobbins made of wood are not suitable for practical use in view of exhaustion of wooden material or resources, a rise in price of wood and protection of the environment of the globe.

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