JPH0229982A - Method for preventing magnetic tape falling and cover for preventing - Google Patents

Abstract

PURPOSE:To prevent the looseness of the tape of a magnetic tape reel body and falling from a core by adhere-fixing the thin board of a light material having adhesion force at its one side at the one side face of the magnetic tape reel body and operating it. CONSTITUTION:At the one side of a thin disk 1 of a properly hard light material having a circular opening part at its center, an adhesive face 2 is formed with fitting plural short pressure sensitive adhesive double coated tapes in an equal interval and radially, and it is adhered to the one side face of the reel body of a magnetic tape 5 wound around a core 4. Thus, when the looseness or the falling of the wound tape is going to be generated due to the deformation, etc., of the core on high speed rotating or on stopping, they are prevented, and it can be used without generating failure at postprocessing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and a cover for preventing the tape of a magnetic tape layer from loosening or falling off from the core.

[Prior Art] When producing magnetic tapes, a long and wide sheet coated with magnetic paint, usually 300 mm to 1,500 mm wide, is made into various tape widths ranging from 3.81 mm to 12.65 mm depending on the purpose. It is necessary to slit (cut) it and wind it around a winding core to make a rolled layered body for use in subsequent processes.

The cores used at this time are acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polystyrene (p
s), are usually made of plastic materials such as polycarbonate (PC). When these cores are exposed to high temperatures, they are deformed due to thermal expansion or the like, or deformed over time due to the pressure of the winding tension of the wrapped tape, resulting in a reduction in the diameter of the core. This reduction in diameter may cause the wound tape to loosen or fall off.

In particular, when the wound layered body is used in a later process, it is repeatedly rotated at high speed and stopped, so that the above-mentioned loosening and falling off are likely to occur. In the prior art, in order to increase the strength of the winding core and make it less likely to be deformed, this was done by incorporating glass fiber into the plastic material, but this did not necessarily produce a satisfactory effect.

[Problems to be solved by the invention] Even with conventional winding cores made of plastic material reinforced with glass fibers, slight deformation occurs in the winding core, which causes the magnetic field to deteriorate during high-speed rotation or when stopped. The tape may fall off the core. - The rolled layer body that has fallen off becomes unusable, resulting in a decrease in productivity.
There was a problem of decreased yield. It is an object of the present invention to solve these problems.

[Means for Solving the Problems] A magnetic tape 5 is wound around a core 4 as shown in FIG. The above-mentioned problem was solved by using it in close contact with one side of the rolled layered body. The rolled layer cover 1 shown in FIG. 1 has eight rectangular double-sided adhesive tapes attached radially at equal intervals on one side of a plastic disk having a circular opening in the center. In the figure, the part labeled "2 adhesive side" is the part to which the double-sided adhesive tape was pasted, and the part labeled "3 non-adhesive side" is the plastic disc surface.

The disc portion constituting the main part of the rolled layered cover of the present invention is:
It does not necessarily need to be made of plastic, but may be made of any lightweight material with appropriate hardness, such as cardboard. The outer shape does not necessarily have to be circular, but may be a regular hexagon, a regular octagon, a median square, or even a square.

The same can be said about the central opening.

However, when comprehensively evaluated from various viewpoints such as material cost savings, ease of processing, product aesthetics, aesthetics and stability during use, ease of repeated use, safety in handling, etc. A thin plastic disc with a circular opening in the center, such as the one shown in Figure 1, is most practical.

Of course, the adhesive surface does not necessarily have to be provided by applying double-sided adhesive tape radially at equal intervals as shown in the figure. Any suitable adhesive can be used to provide the adhesive surface in any arrangement, usually partially and symmetrically, or evenly over one side of the board. The adhesive used on the surface in contact with the magnetic tape is preferably selected so that no adhesive remains when it is peeled off.

The present invention was devised and developed primarily for the purpose of preventing the tape from loosening and falling off the core of a magnetic tape layer, but in principle it can be used in operational processes that include handling of similar tape layers. Needless to say, it can be applied.

[Function] The cover is adhesively fixed to the side surface of the magnetic tape layer due to the adhesive force of the adhesive surface provided on one side of the cover, so that the tape that is wound due to deformation of the core, etc. The cover acts to prevent this from coming loose or falling off.

[Example 1] Outer diameter 114.3+n+*, inner diameter 78.5mm, width 9. O
M+5 (NAB standard) AS resin winding core with a thickness of 15μ
s1 width 3.81mm.

Prepare 200 rolls of magnetic tape with a length of 2,250 m at a tension of 40 g, and store it in a room at 40°C for 120 rolls.
It was left horizontal for an hour. Of these, 100 volumes remained as they were, and for the remaining 100 volumes, the magnetic tape layer of the present invention having the structure shown in FIG. . At this time, we investigated the number of rolls that had defects such as tape falling off during handling in the post-process, and found that 1
Out of 00 volumes, 9B volumes were defective, but in the case where the cover of the present invention was attached, only 6 out of 100 volumes were defective.

The dimensions of the cover used in the above test were 250 mm in diameter.

The inner diameter LL was 4 mm, the thickness was 2 mm, and the material of the cover was plastic. Further, the adhesive surface provided on one side of the cover was constructed by pasting eight double-sided adhesive tapes radially at equal intervals as shown in FIG. 1 and 2.

[Example 2] The same procedure as in Example 1 was repeated except that the fall prevention cover was a disc-shaped cover made of cardboard. Only 4 out of 100 volumes were defective.

[Effects of the Invention] Even if the winding core is deformed and the winding tape would otherwise become loose, by attaching the cover of the present invention, it is possible to prevent defects in the subsequent process. Since it can be used without the occurrence of blemishes, productivity and yield have been significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a preferred representative example of the cover for preventing magnetic tape from falling off according to the present invention. FIG. 2 is a side view of the cover of the present invention adhesively fixed to the side surface of the magnetic tape wound around the core. Reference numbers in the figures represent the following, respectively. 1... Rolled layer cover 2... Adhesive surface 3...
Non-adhesive surface 4...Wrap Core 5...Magnetic tape

Claims (2)

[Claims] (1) In an operating process that involves high-speed rotation and stopping of a magnetic tape layer, it is possible to provide a surface area with adhesive force on one side of the magnetic tape layer on the whole or at least part of the surface. A method for preventing loosening and falling off of magnetic tape, which is characterized by adhesively fixing a thin plate of hard, lightweight material to the magnetic tape. (2) Loosening and falling off of a magnetic tape consisting of a thin flat plate-shaped article having an adhesive surface on one side of the whole or at least part of the article for stably adhering and fixing the article to the side surface of the magnetic tape layer. Prevention cover.