1. Field of the Invention
The present invention relates to a jaceket for containing therein a floppy disk.
2. Related Art Statement
The conventional jacket for floppy disks is generally manufactured by bonding a non-woven cloth to a sheet mainly composed of a hard polyvinylchloride followed by cutting and folding operations. The heat distortion temperature thereof is 60.degree. to 70.degree. C., at most, since it is mainly composed of a polyvinylchloride. For this reason, if the non-woven cloth is laminated at a high temperature, the sheet is deformed or the pattern of the non-woven cloth is transferred onto the surface opposed to the laminated interface, leading to considerable reduction in commercial value. In addition, loss in laminating step is significant, since the employable temperature range for the lamination with the non-woven cloth is narrow.
Furthermore, toxic gases are generated by the heating at the hot-lamination or folding step to cause environmental pollution problems. Setting aside the disadvantages described above, since the floppy disks are carried under various conditions, there is an increasing demand for a floppy disk jacket having a resistance to higher temperature.
Moreover, a multi-ply material having a thin colored resin ply and a light impermeable ply could not be manufactured from a polyvinylchloride resin through an extrusion process due to the problem of thermal stability of the polyvinylchloride resin. Accordingly, a floppy disk jacket made of a polyvinylchloride resin having a colored layer could not be produced.