JPS627651Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Technical Field] The present invention relates to an improvement of a paper tube for winding paper, film, and the like. More specifically, the present invention relates to a paper tube in which the edges of a top laminate such as parchment paper wrapped around the surface of the paper tube do not turn over or come angular, or adhesive does not ooze out from the ends of the top laminate.

[Prior art]

The conventional paper tube has a paper tube main body 1 as shown in FIG.
It has a three-layer structure: a wrapping paper 2 wrapped around the surface of the wrapping paper, and a parchment paper 3 wrapped around the surface of the wrapping paper, that is, a top laminate. In the conventional paper tube configured in this way, the upper paper 3
The ears A at the tips of the end portions 3' are overlapped in a raised manner, and these ears A form sharp corners. Therefore, when the yarn wound here is unwound, it gets caught on this ear part A, resulting in unwinding failure.
Furthermore, when the film is wound up, the edges form marks on the film, resulting in defects in the underlying film. In addition, as shown in Figs. 6 and 7, the selvage A (or end) of the upper paper 3 tends to curl up, so when unwinding the yarn wound around this paper tube, this selvage A
There was a risk that the thread would be caught on the thread, causing the overlying paper 3 to peel off and a considerable portion of the thread to be defective.

Another problem is that in the case of paper tubes as shown in FIGS. 5 and 6 in which the end 3' of the top laminate is laminated on top of the top laminate 3, the adhesive is applied to this end from the end 3'. There was a problem in that the threads protruded toward the upper sticker 3 below the threads 3', causing stains on the threads.

As mentioned above, in conventional bobbins, the edges or edges of the top lining were poorly processed.
Various problems occurred, such as stains on the surface of the paper tube, peeling of the surface paper, and turning up. When the yarn wound around such a paper tube is unwound, various defects such as uneven yarn tension, single yarn cracking, and single yarn breakage occur.

[Purpose of invention]

The present invention was devised in order to eliminate the drawbacks of the above-mentioned prior art. Or, it should not protrude beyond the edge, the width of the strip-shaped top laminate can be made narrower than conventional ones, and the price of the paper tube should be reduced.
The purpose is to

[Structure of the idea]

The paper tube of the present invention that achieves the above object is a paper tube for winding a long object such as a thread or film, and has a space between adjacent wrapping papers wound around the paper tube body. , a top laminate laminated on top of the wrapping paper has ears and ends extending beyond each edge of the wrapping paper, the ends of the top laminate falling diagonally into the spacing; The holder is characterized in that the edge of the holder presses the upper surface of the end of the top affix.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, which is similar to the conventional method in that a wrapping paper 12 and a top paper (parchment paper) 13 are laminated on the surface of a paper tube main body 11. In the present invention, the left end 13a of the top sticker 13 extends beyond the left end 12a of the wrapping paper 12, and the edge 13b of the top sticker 13 extends beyond the left end 12a of the wrapping paper 12.
It covers the The right end 13c of the upper pasting paper 13 is the left end 12a of the adjacent wrapping paper.
It is located below. A gap L is provided between the adjacent edges of the wrapping paper 12, into which the end 13c of the top sticker 13 falls, and furthermore, the left edge 13b of the adjacent top sticker 13 falls above it. The surface of the top sticker 13 is smooth and free from catching.

FIG. 2 shows a second embodiment of the present invention, in which a small gap L is provided between wrapping papers 12, 12 wrapped around the upper part of the yarn tube main body 11. Furthermore, these wrapping papers 12,
The top stickers 13, 13 wound on top of the top sticker 12 have a shape in which the ears 13c are depressed in the gap L, and the ears 13b of the top sticker 13 are pressed down. Therefore, the edges of the top stickers 13, 13 are in a smooth state without any bulges.

Next, a method for manufacturing a paper tube according to the present invention will be explained with reference to FIGS. 3 and 4.

The paper tube main body 11 is formed by being wound around a mandrel 17 while rotating. Said mandrel 17
As the paper tube rotates, the wrapping paper 12 and the top paper 13 are laminated on the paper tube main body 11.
As shown in FIG. 4, wrapping paper 12 is glued by gluepot 16 and roller 21.
Then, it is guided by rollers 19 and transported in the direction of the arrow. On the other hand, the upper parchment paper 13 is glued to one side by another glue pot 15 and roller 20, guided by roller 18, and laminated on the above-mentioned wrapping paper 12.
What is important in this case is that the ears of the top sticker 13 are slightly more protruding than the ears of the wrapping paper 12, this protrusion being indicated as A' in FIG. Further, the right end portion 13c of the top pasting paper 13 is stacked so as to protrude from the edge of the wrapping paper 12. That is, both edges of the top sticker 13 are shaped to protrude from both edges of the wrapping paper 12 that is the lower layer (the left end is short and the right end is long), and the edges A' of the top sticker 13 stacked above. becomes slightly prominent.

According to the paper tube manufacturing method shown in FIG. 4, the right end of the top lining paper 13 is longer than the right end of the wrapping paper 12;
Since only 13c of the wrapping paper 13c is overlapped, this protruding end 13c becomes the bottom of the wrapping paper 12 to be wrapped next, as shown in FIG.
Also, the left edge of the top sticker 13 is slightly protruding from the left edge of the wrapping paper 12, so
The shape is such that it falls into the gap formed between the left and right edges of the wrapping papers 12 that are adjacent to each other.

A particularly important point in manufacturing the paper tube of the present invention is that when the wrapping paper 12 and the top lining 13 are overlapped to cover the surface of the paper tube body 11, the edges of the top lining 13 (13b in FIG. 1), In Figure 4
The portion A') slightly protrudes from the edge of the wrapping paper 12, and in FIGS. 1 and 2, it protrudes by a width of approximately L. Paste 13 on this
The protruding width L is equal to or slightly longer than the thickness of the wrapping paper 12.

On the other hand, as shown in FIG. 1, the length of the end 13c of the top sticker 13 held under the wrapping paper 12 may be equal to or considerably larger than the width L, but in any case, It is important that the shape is such that the edges of the top pasting paper 13 are held down by the edges of the wrapping paper 12.

The adhesive C oozing out from between the wrapping paper 12 and the top pasting paper 13 accumulates under the ear portion 13b, dries and solidifies, and is not exposed to the bobbin surface at all. Further, since the ear portion 13b is integrally bonded to the other surface with the adhesive that protrudes, it will not turn over or peel off.

[Effect of idea]

As described above, the present invention is a paper tube for winding a long object such as a thread or a film, and the space L between adjacent wrapping papers 12 wound around a paper tube main body 11 is provided.
The upper paper 13 to be laminated on the wrapping paper 12 has ears 13b and ends 13c extending beyond each edge of the wrapping paper 12, and the edges 13c of the upper paper 13 extend beyond the above-mentioned interval. It falls diagonally into L, and the ear part 13b presses the upper surface of the end part 13c of the upper paper with its edge.

Therefore, the square edges A of the top sticker will not protrude as shown in FIG. 5, nor will they turn up as shown in FIGS. 6 and 7. Furthermore, since the adhesive bonded to the top laminate appears to be pressed down by the edges 13b of the top laminate, the amount of adhesive sticking out is minimized. Furthermore, since one end of the top laminate is not wrapped around the end of the wrapping paper as in the conventional method, the width of the wrapping paper can be made narrower and the cost of the paper tube can be reduced.

When the paper tube of the present invention is used as a thread-wound bobbin, when the innermost thread layer of the wound thread is unwound or re-wound, uneven thread tension, single thread breakage, or single thread breakage may occur. The yarn can be unraveled smoothly without any problems such as the following. Furthermore, since the adhesive is prevented from spilling out by the edges of the top laminate, the surface of the paper tube remains clean and the innermost yarn of the wound yarn is prevented from adhering to the surface of the paper tube. Therefore, as mentioned above, uneven thread tension does not occur. In addition, even when using parchment paper, which has water and oil resistance effects, as the top paper (surface paper), the edges are bent toward the paper tube body, so it can be pasted without peeling or turning up. . Therefore, even in the case of severe thread winding, it can be carried out smoothly, and it is possible to improve the quality of the thread wound around the paper tube and to reduce the number of defective threads.

When the paper tube of the present invention is used for film winding, the same effect as described above is obtained, but in particular, since the edges of the outermost layer of top paper are not protruding in an angular manner, the paper tube is The removed film is not left with traces of the edges of the top laminate, and therefore the film is not defective. Furthermore, since the adhesive does not leak out from the edges of the top laminate, it is possible to prevent the innermost film from becoming dirty. In the end, when a film is wound onto a paper tube obtained by the present invention,
The film does not have the step marks of the overlay and is free from stains, and the quality can be significantly improved. In addition, in the paper tube of the present invention, the top paper is formed in a structure that essentially does not turn over, so even if used for a long time, the threads and film will not get dirty, and the top paper and wrapping paper will not peel or turn up. reduced and can be used for a long time. Therefore, according to the present invention, the productivity of yarns and films can be improved, and a great effect can be expected in reducing costs.

Note that the top laminate in the present invention means a sheet-like material such as paper, paper treated with water and chemical resistance, or a film.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the main parts of the paper tube of the present invention, FIG. 3 is a side view showing the manufacturing process of the paper tube of the present invention, FIG. 4 is a plan view of the same, and FIG. 6th
The figure is a sectional view showing the main parts of a conventional paper tube, and FIG. 7 is an explanatory diagram of the conventional paper tube in a state in which the top paper is turned over. 11...Paper tube body, 12...Wrapping paper, 1
3... Top sticker, 13b... Ear part, 13c... End part.

Claims (1)

[Scope of utility model registration request] A paper tube for winding a long object such as a thread or a film, in which a gap L is provided between adjacent wrapping papers 12 wound around a paper tube main body 11, and the wrapping paper 12 is laminated on top of the wrapping paper 12. The top sticker 13 to be attached is the ear part 13
b and end 13c extend beyond each edge of the wrapping paper 12, and the end 13c of the top wrapping paper
3c falls diagonally within the interval L, and the ear portion 1
3b presses the upper surface of the end portion 13c of the top laminate with its edge.