DE8137367U1 - Paper tube - Google Patents

Description

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The Neueruxig refers to improved paper tubes, in particular paper tubes for winding plastic films for magnetic tapes, of which high fidelity (Hi-Fi) is required, as for audio tapes and video tapes.

Paper tubes of this type are used, such as the Japanese utility model 55-17009 by Showa published in the Japanese Utility Model Gazett, shown made by that rolled up paper saturated with synthetic hair is wrapped several times around the surface of a medium-length paper tube, the surface by means of hot pressing or the like made smooth and both sides cut off at the specified length. Such known However, pipes have a number of disadvantages:

a) The length of the finished paper tube is limited by the width of the paper saturated with synthetic resin. If the paper saturated with synthetic resin is 30 cm wide, the finished tube has a length under 30 cm. In other words, for each paper tube that has a predetermined length in the finished state a synthetic resin-saturated paper of a slightly narrower width must be prepared.

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b) While the spiral winding can be performed continuously, the wrapping must rolled up paper (convolute winding) on one tube after the other, what is uneconomical.

c) When wrapping rolled paper, it is generally technically difficult to make wide paper uniform to wrap a paper tube after applying the binder. And when it's done, it will be because of the poor bonding does not result in a smooth surface. But to get paper tubes with a smooth surface, paper saturated with synthetic resin has been wrapped with a relatively small width. But this is uneconomical and, moreover, long finished pipes with a smooth surface are difficult to manufacture.

d) When paper saturated with synthetic resin is dried with hot air in a short time, the synthetic resin becomes hard and the paper cannot be rewound. Therefore, the synthetic resin saturated paper must of course be dried slowly, which is associated with a high expenditure of time and money.

e) When paper of ordinary thickness saturated with synthetic resin is rolled up and wrapped, unevenness occurs

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and no smooth surface is obtained.

The innovation is therefore based on the task of providing a paper tube for winding plastic films for magnetic tapes, | like audio tapes and video tapes, to create that econom- |

is economic and has completely smooth surfaces.

The task is solved by the pipe according to the protection claim.

The innovation will now be described using the attached figures, which show:

1 shows a side view of a paper tube before coating with a synthetic resin, I.

2 shows a side view of a paper tube after coating with a synthetic resin,

3 shows a longitudinal section of a paper tube after coating with a synthetic resin,

Fig. 4 is a cross-sectional image of a tape-shaped paper; its cross-section is a trapezoid in which the baseline is longer than the top line;

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5 shows a cross-sectional image through a tape-shaped paper; its cross-section is inverted Trapezoid in which the base line is shorter than the top line,

6 shows a cross-sectional image through a tape-shaped paper; its cross section is a parallelogram,

; Fig. 7 is a longitudinal section through part of the bare

Outside of a paper tube without synthetic resin coating (hereinafter referred to as "the simple Pipe "designated),

Fig. 8 is a flow sheet showing how the surface of the simple pipe is ground and coated and the coated tube is dried and sanded again.

In the figures, the reference symbols mean:

ribbon-shaped paper

Synthetic resin film coating

Base of the tape-shaped paper Surface of the tape-shaped paper Bevel the tape-shaped paper. Sand before coating

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16 coating

17 drying

18 Sanding after coating and drying.

The paper tube according to the innovation eliminates all the disadvantages of the prior art; the pipe has the following features and advantages:

As the figures show, the base tube is made by winding the tape-shaped paper 10, the cross-section of either is a trapezoid, a counter-trapezoid or a parallelogram, as seen in Figures 4, 5 and 6 to the bare outer portion of a spirally twisted paper tube as shown in Fig. 7 was prepared.

If the paper 10 of FIG. 4 with a trapezoidal cross-section was used, the binder is applied to the base 12, the edge of the paper 10 is pressed and the Paper wrapped so that the bevel 14 of one paper and the surface 13 of the next paper are horizontal are. In this case, the edge of the base 12 is attached to the bevel 14 of the next paper.

If the paper 10 of Fig. 5, the cross-section of which is inverted trapezoidal, was used, the binder is applied to the base 12, the edge of 10 so

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pressed and the paper wound so that the surface 13 of one paper and the surface 13 of the next Paper are horizontal. In this case the chamfer 14 is next to the edge of the surface 13 Attached to paper.

When the paper 10 of Fig. 6, the cross-section of which is that of a parallelogram, uses wux-de, binding agent is applied to the base surface 12 and the paper is wound so that the surface 13 of one paper and the surface 13 of the next paper are horizontal and in such a way that there are no gaps between the bevels 14 of the two papers. In this case, ^J chamfer 14 st of a paper exactly attached to the bevel 14 of the next paper.

When the bare outer part of the paper tube is not wrapped in a spiral, but using ordinary Paper, the cross-section of which is that of a rectangle, remains a space between the papers and themselves when coated with synthetic resin, a slight unevenness appears on the paper surface and it is absent the smoothness. A suitable paper tube for winding plastic films of hi-fi quality is not obtained.

As can be seen in FIG. 8, in order to produce the paper tube according to the invention, the base tube is rotated about its axis

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and sent in the direction of the arrow. In this way, the surface of the base tube is sanded at 15, with synthetic hair *. in a thickness of over 90 μm. coated at 16, dried at 17, sanded again at 18 and the pipe is finished so that the thickness of the synthetic resin is over 50 μm.

The advantages of this innovation are:

1. Since it is a spiral paper tube, it can be made in any length and at a low cost will.

2. Since it is a spiral paper tube, it can be wound continuously in an efficient manner.

3. Since it is a spiral tube, it is not necessary to use wide paper and it becomes a paper tube obtained with an even and smooth surface.

4. Since a synthetic resin is applied to the surface of the paper tube, a obtained tube coated with synthetic resin.

5. For the same reason as mentioned under 4., the manufacturing process is simple and economical.

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I 6. Since the surface of the tube is sanded twice

p will, before and after coating, she is very

I smooth. To be able to sand after coating,

the thickness of the coating must be at least 90 µm. If it is below that, it will be after the last sanding no stable smooth synthetic resin film was obtained.

I 7. The innovation is a paper tube with a very

I received a smooth surface that was ideal for winding

I Plastic films that require hi-fi quality

I will, like audio tapes and video tapes, is appropriate.

8. Since a synthetic resin is applied to the surface of the paper

pipe is taken care of, the type of synthesis I Resin can be changed easily; so can by change

I the type of synthetic resin, the desired surface

I can get hardness of the pipe and change it

p the color of the dye or pigment to which the

I synthetic resin is mixed in, - can change the nature of the

§ The surface of the pipes is distinguished by the color

I will and the type of thickness of the films can be as well

£ are displayed.

$ 9. After using the paper tube when the surface

I damaged or dirty, the pipe can through

w the grinding-coating-grinding process again-

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can be made usable. This reusability makes the pipe more economical.

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- 11 summary

Paper tube

A tube for winding plastic films such as magnetic tape. Around a paper tube is a band-shaped paper, the cross-section of which has the shape of a trapezoid or Parallelogram, wound spirally. The resulting surface is sanded and put on it Coating of a colored synthetic resin applied, which is sanded after drying. The pipe draws is characterized by extremely good surface smoothness and can be produced economically.

Claims (1)

Claim: Paper tube, especially for winding plastic films ~ P characterized in that on the bare outer part of a paper tube a tape-shaped paper (10), its Cross section is parallelogram or trapezoidal, is spirally wound, and the resulting sharpened Surface has a synthetic resin coating (11), which is also sanded European Paterat Attorneys Admitted to the European Patent Office Deutsche Bank AG Hamburg, ¹ NV; OB /, 28 * 4 ^ 7 '(^, ί, ^' μοό JOO 00) Poetschook Hamburg 2842-206 Dresdner.ρβη. £, AG.'Hi} mliur {;. "No. Q33603B (BLZ 20080000)