Methods and devices for mechanical separation of multilayer tapered interlayers
AssigneeSolutia Inc.
InventorsSUNGKYUN SOHN, JOSEPH EDWARD BIELIN, NICHOLAS EDWARD KEEN
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Abstract
Processes are disclosed for separating a first layer from a remainder of a tapered multilayer interlayer sheet, in which the tapered multilayer interlayer sheet is heated, and thereafter the first layer is separated from the remainder of the tapered multilayer interlayer sheet by pulling the first layer and the remainder of the tapered multilayer interlayer sheet in different directions, in a defined orientation, without the tapered multilayer interlayer sheet wrinkling or tearing.
Claims24
A continuous process for separating a first layer from a remainder of a tapered multilayer interlayer sheet, the process comprising:
- a. heating the tapered multilayer interlayer sheet to a temperature from about 25° C. to about 70° C.;
- and
- b. thereafter separating the first layer from the remainder of the tapered multilayer interlayer sheet by pulling the first layer and the remainder of the tapered multilayer interlayer sheet in different directions,
- wherein an angle α defined by the first layer and the tapered multilayer interlayer sheet at the separation point is smaller than or equal to an angle β defined by the tapered multilayer interlayer sheet and the remainder of the tapered multilayer interlayer sheet at the separation point, during the continuous process, and
- wherein the tapered multilayer interlayer sheet has a thicker side and a thinner side, and wherein a positioning roll positioned before the separation point is positioned so that it is tilted in the Z direction up to about 1% of the positioning roll length, or in the Y direction up to about 0.5% of the positioning roll length, or in both the Z direction up to about 1% of the positioning roll length and in the Y direction up to about 0.5% of the positioning roll length, to prevent the thicker side of the tapered multilayer interlayer sheet from shifting toward the middle of the positioning roll, during the continuous process.
A continuous process for separating a first layer from a remainder of a tapered poly(vinyl acetal) multilayer interlayer sheet, the process comprising:
- a. heating the tapered multilayer interlayer sheet to a temperature from about 25° C. to about 70° C.;
- and
- b. thereafter separating the first layer from the remainder of the tapered multilayer interlayer sheet by pulling the first layer and the remainder of the tapered multilayer interlayer sheet in different directions,
- wherein an angle α defined by the first layer and the tapered multilayer interlayer sheet at the separation point is smaller than or equal to an angle β defined by the tapered multilayer interlayer sheet and the remainder of the tapered multilayer interlayer sheet at the separation point, during the continuous process, and
- wherein the tapered multilayer interlayer sheet has a thicker side and a thinner side, and wherein a heating unit located before the separation point is positioned so that it is tilted in the Z direction up to about 1% of the heating unit roll length, or in the Y direction up to about 0.5% of the heating unit roll length, or in both the Z direction up to about 1% of the heating unit roll length and in the Y direction up to about 0.5% of the heating unit roll length, to prevent the thicker side of the tapered poly(vinyl acetal) multilayer interlayer sheet from shifting toward the middle of the heating unit, during the continuous process.
Dependencies are inferred from the claim text.