Abstract: Moisture indicator strips of the capillary action type which provide a visual indication of wetness for diapers, hospital underpads, and the like, are located at a point removed from the actual point of wetness, such as at the edge of the diaper or surgical dressing. This invention further relates to a method for automatically and continuously incorporating a wetness indicator within the structure of the diaper or under pad during the manufacture thereof.

Abstract: A machine for heat sealing articles between two continuous webs of plastic material comprises two parallel synchronously driven shafts, each of which has a pair of wheels on it which are brought into pressure relationship for heat sealing. One shaft is mounted for yielding perpendicularly to its rotational axis and carries a cam follower disc. The follower disc is raised intermittently and the seal wheels are thereby separated, to relieve pressure and omit sealing, with a cam that is on the other shaft and is engaged periodically for rotation by means of a clutch.