KR20060116439A - Paper tube having walls including helically wounded void portion - Google Patents

Abstract

A paper tube having a wall formed with a spirally continuous hollow is provided to increase the stiffness and the insulating effect by the hollow and the narrow paper strip according to the formation of the paper tube having a large section coefficient. A paper tube(10) is manufactured by spirally winding plural paper strips(1~8) at the mandrel. The width of at least one paper strip placed in the plural paper strips to have a wall formed with a spirally continuous hollow(V) is smaller than the paper strip placed inside and the paper strip placed outside. One side of the width is overlapped at the upper part of the paper strip placed inside and wound at the mandrel, and the other side of the width is overlapped at the lower part of the paper strip placed outside and wound at the mandrel.

Description

PAPER TUBE HAVING WALLS INCLUDING HELICALLY WOUNDED VOID PORTION}

1 is a perspective view of one embodiment of a branch pipe according to the present invention

FIG. 2 is an explanatory diagram of a step of manufacturing the branch pipe of FIG. 1

<Short description of drawing symbols>

1-8 Paper Strips 9

10 branch pipe 11 spirally continuous hollow

The present invention relates to a branch pipe, and more particularly, to a branch pipe having a wall in which a spiral continuous hollow is formed.

Conventionally, a circular paper tube having a hollow circular cross section and a square paper tube having a hollow rectangular cross section have been produced and sold. Recently, the demand for recyclable paper pallets is increasing as the distribution of pallets made of felling and synthetic resin is regulated to preserve the environment.

Circular support or square paper is used as a supporting member to support the bottom of the paper pallet, and to provide a support member having a greater strength in order to increase the weight of cargo loaded on the pallet, it is necessary to provide a thick paper tube. desirable. However, if the thickness of the paper pipe is simply thickened for strength reinforcement, the strength of the paper pipe does not increase in proportion to the material used, resulting in a high consumption of materials, and in some cases, only a logistic cost increase due to the heavy load. .

On the other hand, it is manufactured by inserting a foam material made of a synthetic resin such as urethane into the core between the aluminum panel as a wall for insulation of the refrigeration or refrigeration apparatus. This insulation wall is difficult to fix the aluminum panel and the foaming material, there is a problem that the insulation efficiency is lowered because the frame made of aluminum must be used to support the wall. In addition, there is a problem that it is difficult to recycle due to the use of synthetic foam material causes environmental problems.

The present invention is to solve the above problems, on the other hand, when using the paper pipe as a durable material, such as a support member of the pallet provides a paper pipe having a structure that can maximize the strength of the cross section compared to the amount of the material used. It aims to do it.

On the other hand, an object of the present invention is to provide a paper tube having a superior rigidity than the foamed material formed of urethane when the rectangular paper tube is used as a heat insulating material, thereby making it easy to manufacture a heat insulating wall and having a better heat insulating effect.

The branch pipe having a spirally continuous hollow wall according to the present invention has an inner portion of the plurality of paper strips such that the branch pipe has a spirally continuous hollow wall in a branch pipe manufactured by winding a plurality of paper strips spirally in a mandel. The width of at least one paper strip positioned at is smaller than the width of the paper strip positioned at the inner side and the paper strip positioned at the outer side, and one side of the width overlaps the upper portion of the paper strip located at the inner side and is wound on the mandrel and the other side is It is superimposed on the lower portion of the paper strip located on the outside characterized in that it is manufactured by winding in the mandrel. In addition, the shape of the cross section of the branch pipe can be manufactured in various shapes, such as a circle, a rectangle, and a triangle, as needed. When the paper pipe according to the present invention is used as a support member or a durable member of a paper pallet, the wall thickness is preferably 8 mm or more. When used as a cushioning material used for insulation or packaging, the thinner the wall thickness is, the better.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a perspective view of an embodiment of a branch pipe according to the present invention, Figure 2 is an explanatory view of a process for manufacturing the branch pipe of FIG.

The branch pipe of the embodiment shown in FIG. 1 is a branch pipe 10 having a rectangular cross-sectional shape. As shown in the figure, each wall of the branch pipe having a rectangular cross-sectional shape is formed with a continuous spiral V in a spiral shape.

2 shows a method of manufacturing a branch pipe in which a spiral continuous hollow b is formed. First, a mandrel 9 having a rectangular cross section and rotatably installed is prepared. Next, the paper strip for manufacturing the branch pipe 10 to the mandrel is attached to the mandrel inclined at regular intervals. Although not shown, each paper strip is coated with an adhesive on an attachment surface in advance. At this time, the angle of inclination (spiral angle) to wind the paper strip 1-8 to the mandel is determined according to the width of the paper and the thickness of the paper pipe to be manufactured. The paper strip 8 uses a high quality paper strip as the paper strip attached to the outside of the branch pipe, but the remaining paper strips generally use recycled paper strips of low cost. In particular, the outer surface of the paper strip 8 is preferably coated with an oily material such as soybean oil to form a coating or coating a synthetic resin film to protect the inner paper strip when exposed to moisture.

In the paper paper tube of this embodiment, the width of the paper strip 4 is narrower than that of the remaining paper strips 1-7. That is, it has a width as narrow as the width 4-1 of the other side indicated by the dotted line. In addition, the paper strip 4 is overlapped with the upper part of the paper strip 3 located on the inner side of the paper strip to be wound on the mandrel, and the other side is overlapped on the lower part of the paper strip 5 located on the outer side. It is supposed to be cold. Thus, in the illustrated state, if the mandrel 9 is rotated in the direction of the arrow, and the wound paper strips are discharged along the axial direction of the mandrel, the wall of the branch pipe has the width of one side of the paper strip 4 removed. The corresponding hollow (V) is to be formed spirally along the longitudinal direction. A part in the dotted line of FIG. 1 is explanatory drawing which shows the cross section at the time of cut | disconnecting the branch pipe 10 in the longitudinal direction. As shown in the drawing, the fourth paper strip 4 has a narrow width, and it can be seen that the hollows V are formed at regular intervals.

The branch pipe according to the present invention has the advantage of increasing the cross-sectional coefficient of the branch pipe as compared to the amount of paper used while reducing the paper strip because the spiral hollow is continuously formed on the wall.

In addition, the branch pipe according to the present invention has a hollow hollow formed on the wall of the branch pipe itself and the branch pipe formed by the mandelel, has a superior strength compared to the foamed synthetic resin and at the same time can block the heat transfer by the air layer double. Provide excellent thermal insulation.

According to the present invention, there is provided a paper tube having a wall in which spirally continuous hollows are formed, thereby providing a paper tube having a larger cross-sectional coefficient compared to the amount of paper strip used. In addition, it provides a paper pipe having a continuous spiral hollow formed on the wall by the hollow formed by the mandrel and a narrow paper strip to provide a paper pipe superior in synthetic strength such as urethane foam and excellent thermal insulation effect.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (3)

In the paper pipe manufactured by winding a plurality of paper strips spirally around the mandrel, The width of at least one paper strip positioned inside of the plurality of paper strips is smaller than the width of the paper strip positioned on the inner side and the paper strip positioned on the outer side of the plurality of paper strips so as to have a wall formed with a spiral continuous hollow. The paper pipe, characterized in that it is superimposed on the upper part of the paper strip located in the wound on the mandrel, and the other side is manufactured by being wrapped in the mandrel overlapped on the lower part of the paper strip located on the outside. The method of claim 1, The cross section of the branch is a branch, characterized in that the square. The method of claim 2, The wall of the paper pipe is characterized in that the thickness of 8 mm or more.

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