Production of lenticular tablets by melt calendering
First Claim
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1. A process for the production of lenticular tablets, which process comprises:
- molding a melt in a calender until tablets are formed;
said melt comprising an active ingredient;
said calender comprising counter-rotating molding rolls which have on their surface a plurality of mutually opposite depressions in the shape of segments of an ellipsoid for receiving and molding the melt; and
wherein the angle between the tangential surface of each depression at the upper edge and the surface of the molding roll is <
90°
; and
then deflashing the tablets.
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Abstract
The present invention relates to a process for the production of lenticular tablets by melt calendering in which molding rolls with depressions in the shape of segments of an ellipsoid are used. The process according to the invention affords tablets which are easily deflashed and in which the tablet residue to be abraded when there is a displacement between the upper and lower half of the tablet is small.
21 Citations
11 Claims
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1. A process for the production of lenticular tablets, which process comprises:
- molding a melt in a calender until tablets are formed;
said melt comprising an active ingredient;
said calender comprising counter-rotating molding rolls which have on their surface a plurality of mutually opposite depressions in the shape of segments of an ellipsoid for receiving and molding the melt; and
wherein the angle between the tangential surface of each depression at the upper edge and the surface of the molding roll is <
90°
; and
then deflashing the tablets. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- molding a melt in a calender until tablets are formed;
-
8. A calender molding roll having on its surface a plurality of depressions in the shape of segments of an ellipsoid;
- said depressions having an upper edge;
wherein the angle between the tangential surface of each depression at the upper edge and the surface of the molding roll is <
90°
. - View Dependent Claims (9, 10, 11)
- said depressions having an upper edge;
Specification