DIE CUTTER BLANKET
A die cutter blanket assembly includes a plastic sheet material member and a sheet metal liner that has an array of preferably dome shaped dimples molded to the plastic sheet material member, the liner being attached to the member by bonding during the molding process. The dimples permit the plastic material to flow therebetween on a side of the liner opposite the sheet material member to encapsulate the liner with the plastic material as the liner and plastic sheet member are molded. The resulting blanket assembly is more flexible and easier to install on an anvil cylinder than prior blanket assemblies which comprise conventional flat metal liners without the encapsulation.
1 . A die cutter blanket assembly for use with a cylindrical anvil having a channel, the assembly comprising:
a die cutter plastic material sheet member having first and second ends;
a sheet metal liner bonded to the plastic sheet member and substantially encapsulated by the plastic material; and
a locking arrangement at the first and second ends for securing the blanket assembly to the anvil.
2 . The assembly of claim 1 wherein the liner includes a plurality of upstanding projections.
3 . The assembly of claim 2 wherein the projections are surrounded by the plastic material for substantially encapsulating the liner with the plastic material sheet member.
4 . The assembly of claim 1 wherein the plastic sheet member is urethane.
5 . The assembly of claim 2 wherein the projections are semispherical.
6 . The assembly of claim 2 wherein the projections are dome shaped.
7 . The assembly of claim 6 wherein the projections are about ⅝ inches (about 16 mm) in diameter at their junction with the liner.
8 . The assembly of claim 6 wherein the projections are about 0.08 to about 0.09 inches in height above the plane of the sheet material of the liner.
9 . The assembly of claim 2 wherein the projections are spaced apart center to center about two Inches (50 mm) in a plurality of parallel rows each row comprising a linear array of projections.
10 . The assembly of claim 9 wherein the rows are spaced apart in the range of about two inches (about 50 mm) to about four inches (about 100 mm).
11 . The assembly of claim 1 wherein the liner is about 0.017 to about 0.021 inches thick sheet steel.
12 . The assembly of claim 1 wherein the locking arrangement includes a locking device for locking engagement with the anvil channel.
13 . The assembly of claim 12 wherein the locking arrangement includes a projection which mates with the anvil channel for said locking engagement.
14 . The assembly of claim 14 wherein the liner has opposite sides, the plastic material being present on both sides of the liner.
15 . A method of making a die cutter blanket assembly for covering a rotatable cylindrical anvil of a die cutter apparatus comprising:
encapsulating a sheet metal blanket liner with a plastic material during the molding of a die cutter plastic sheet member having first and second ends, the molding for bonding the encapsulated liner to the plastic sheet member, and forming a locking arrangement at the first and second ends for locking the assembly to the anvil.
16 . A die cutter blanket assembly for covering a rotatable anvil of a die cutter apparatus, the anvil having a channel therein, the assembly comprising:
a plastic material sheet member having first and second ends, the member for wrapping about the anvil such that the ends abut one another in the wrapped state to form a substantially continuous outer die cutting work surface about the anvil;
a sheet metal liner bonded contiguous to and overlying the plastic sheet member, the sheet metal liner having an array of spaced upstanding projections, the plastic material substantially encapsulating the liner with a plastic layer at least between the projections; and
a locking arrangement secured to the sheet material member at the first and second ends for securing the sheet material member and liner to the anvil.
17 . The assembly of claim 16 wherein the plastic material is in the region between the projections on a side of the liner opposite said plastic sheet member for said encapsulation.