Why do gelatin sheets have a diamond pattern?
Are they perforations?
Are they for measurement?
Are they for brand recognition or marketing or just aesthetics?
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I think it is a side effect of the drying process. If you look at about the 5m50s mark, the drying conveyor is a diamond pattern.
That seems a plausible answer. The actual belt of the machine is stamped in a way that when it is stretched out it forms the diamond pattern. The gelatin when drying probably has air passed over it which will cause shrinkage where the mesh is as the air cannot get through the pattern of the mesh wire thus causing the shape. The gelatin would just stick to a flat metal sheet as any chef in a kitchen could tell you. Once the gelatin is moistened it reverts to it’s glue like consistency.