It is possible to wind an optical fiber up to the vicinity of an edge of a flange of a bobbin, and prevent a winding collapse of the optical fiber without increasing work steps. In a state in which the optical fiber coated with a coating resin is wound around the bobbin, a resin film that does not include a plasticizer is covered so as to be in direct contact with an outer circumference of the optical fiber, and the optical fiber is stored.

A reel body is the reel body in which an adhesive film having an adhesive layer on a base material layer is wound around a winding core. The adhesive film does not have a protective layer on the adhesive layer and is wound around the winding core in a state in which the adhesive layer and the base material layer are contiguous to each other in the radial direction of the winding core. A width of the winding core in an axial direction is smaller than a width of the adhesive film. In a rolled body of the adhesive film, an overhang portion jutting out in the axial direction of the winding core is provided.

A reel body is the reel body in which an adhesive film having an adhesive layer on a base material layer is wound around a winding core. The adhesive film does not have a protective layer on the adhesive layer and is wound around the winding core in a state in which the adhesive layer and the base material layer are contiguous to each other in the radial direction of the winding core. A width of the winding core in an axial direction is smaller than a width of the adhesive film. In a rolled body of the adhesive film, an overhang portion jutting out in the axial direction of the winding core is provided.

A component carrying tray includes a bottom plate on which a component is stacked, and a projection. The projection has a main body and a regulator. The main body is hollow and has a tapering shape. The regulator is formed in the main body and extends in a direction perpendicular to the carrying surface and contacts a side surface of the component to regulate the component carried on the carrying surface. The bottom plate has a through hole so that when the component carrying tray is stacked on an additional component carrying tray, a projection of the additional component carrying tray comes into the hollow part of the main body. An opening is formed in the projection and configured to avoid, when the component carrying tray is stacked on an additional component carrying tray, interference between the projection and a regulator of the additional component carrying tray.

A glass ribbon in the form of a glass roll is provided that is optimized with respect to the requirements of a long service life and at the same time compact dimensions. A bending radius on the inner side of the thin glass roll is determined by performing breakage tests on samples of the glass material, statistical parameters are determined on the basis of the breakage tests, and the statistical parameters are converted into a range of bending radii which meet the requirements on service life and the most compact dimensions possible of the thin glass roll.

A packaged wound coil assembly includes a coil of wire, a payout tube, two flat panels on either side of the coil of wire, and a retainer to secure the flat panels relative to the coil assembly. The package assembly uses significantly less materials than prior packages and as assembled can assume less overall space than prior packages for similar wire coils.

A packaged wound coil assembly includes a coil of wire, a payout tube, two flat panels on either side of the coil of wire, and a retainer to secure the flat panels relative to the coil assembly. The package assembly uses significantly less materials than prior packages and as assembled can assume less overall space than prior packages for similar wire coils.