Browse Prior Art Database

Unit Set Manufacture

IP.com Disclosure Number: IPCOM000073907D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Herron, TF: AUTHOR

Abstract

Unit set stubs usually are made using a water or solvent base cold glue. Cold glue dries rather slowly and until dry does not bond sufficiently to prevent the plies from skewing thus slowing throughput or requiring the lengthening of the web path; but cold glue can be laid down very thin, so the stubs do not become significantly thicker than the rest of the set. Unit sets also have been made using a hot melt adhesive or glue which bonds the plies immediately; but it builds up in the stub area requiring an operator to manually reverse successive groups of sets as they are placed in a shipping carton to keep the stark substantially level.

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Unit Set Manufacture

Unit set stubs usually are made using a water or solvent base cold glue. Cold glue dries rather slowly and until dry does not bond sufficiently to prevent the plies from skewing thus slowing throughput or requiring the lengthening of the web path; but cold glue can be laid down very thin, so the stubs do not become significantly thicker than the rest of the set. Unit sets also have been made using a hot melt adhesive or glue which bonds the plies immediately; but it builds up in the stub area requiring an operator to manually reverse successive groups of sets as they are placed in a shipping carton to keep the stark substantially level.

To overcome these difficulties, unit sets are formed at high speed and without stub edge build-up by applying hot melt and cold melt glue simultaneously just before webs of paper and interleaved carbon converge at a collator.

Webs of paper 1 and carbon 2 unwound from supply rolls 3,4, respectively (see A), converge at a collating station and pass through the nip of pressure rolls 5 to glue the webs together at preselected longitudinally spaced points, prior to their being cut by guillotine blade 6 into unit sets 7. Transversely spaced nozzles 8,9 interposed between 3,5 intermittently spray heated hot melt glue and cold glue, respectively, onto the upper surface of all paper webs 1 except the uppermost. Carbon webs 2 are narrower than webs 1 (see B), creating a marginal gap or stub area 10 along one edge to whi...