초록 ▼

The apparatus produces heat-shrinkable plastic caps having a metal containing top, and is comprised of: (a) at least one mandrel having a flat end-face, (b) means for placing a metal containing disc coated with heat sensitive adhesive on the end-face of said mandrel, (c) means for placing a band of

The apparatus produces heat-shrinkable plastic caps having a metal containing top, and is comprised of: (a) at least one mandrel having a flat end-face, (b) means for placing a metal containing disc coated with heat sensitive adhesive on the end-face of said mandrel, (c) means for placing a band of preselected length of heat-shrinkable plastic over said mandrel, (d) heating means for pre-shrinking said plastic band to conform to the shape of said mandrel and to overlay the edge of said disc, said heat-shrinking means imparting insufficient energy to activate the adhesive on said disc, and (e) electric induction heating means for rapidly heat-sealing said disc to the portion of said band overlaying the disc by activating the heat-sensitive adhesive on said metal containing disc by the heat generated by induction in said metal.

대표청구항 ▼

Apparatus for producing heat-shrinkable plastic caps having a metal containing top comprising in combination: (a) at least one mandrel the top of which forms an end-face for positioning a disc thereon, said mandrel being provided with a movable core, the end-face of which forms the top of the mandre

Apparatus for producing heat-shrinkable plastic caps having a metal containing top comprising in combination: (a) at least one mandrel the top of which forms an end-face for positioning a disc thereon, said mandrel being provided with a movable core, the end-face of which forms the top of the mandrel and wherein said core is provided with: (1) a passageway terminating in said end-face as a pneumatic orifice and (2) means for connecting said passageway to a source of vacuum or pressure, (b) means for placing a metal containing disc coated with heat sensitive adhesive on the end-face of said mandrel, (c) means for placing a band of preselected length of heat-shrinkable plastic over said mandrel, the length of said band being sufficient to protrude over the end-face of said mandrel and to overlay the edge of said disc so as to be heat-sealable to said disc, (d) heating means for pre-shrinking said plastic band to conform to the shape of said mandrel and to overlay the edge of said disc, said heat-shrinking means imparting insufficient energy to activate the adhesive on said disc, and (e) electric induction heating means for rapidly heat-sealing said disc to the portion of said band overlaying the disc by activating the heat-sensitive adhesive on said disc by the heat generated by induction in the metal.