US 4,162,892 AGranted

Method of manufacturing continuous coil slide fasteners

AssigneeWm. E. Wright Co.

InventorsWilliam R. Wright, Theodore Murphy, Kenneth Piazzo, August Leal

Life of this patent

Estimating the term…

Loading patent…

Abstract

Continuous method of manufacturing coil type slide fasteners by forming synthetic monofilaments into a pair of uncured fastener element coils. The fastener coils are then intermeshed in coupled relation and sewn onto the adjacent edges of a pair of uncured knit tapes. The coil, sewing thread and knit tapes are each composed of the same thermosetting resin. The fastener chain is advanced at uniform tension and velocity through a pressing stage and viscous dye bath containing a dispersion type thermosoling dye. The advancing chain is then vacuumed to provide uniform deposition of the dye on the tape and coil. The chain is then dried and led through a heating zone maintained at a temperature which simultaneously fixes the dyestuffs and cures or thermosets the coil and knit tapes. Thereafter, the moving chain is washed and calendered while being maintained under tension. The continuous zipper chain is then cut to length and supplied with a slider and end stops.

Claims10

Dependent claims

Method of manufacturing coil type slide fasteners comprising the steps of forming a pair of slide fastener coils from polyester monofilament material at a moderate temperature to facilitate coil forming, intermeshing said coils and securing the same along adjacent edges of a pair of fabric webs formed of yarn of the same material as the coils, whereby a continuous length of slide fastener chain is formed;

continuously moving said chain in tensioned condition while performing the following sequential treatments;
applying to said chain a thermosoling liquid dispersion dye in solution with a thickener in a sufficient quantity to promote application of a uniform film of the dispersion dye on said fastener coils;
subjecting the material forming said chain for the first time to a temperature in the range of 380.degree.-420.degree. F. which is substantially higher than the coil forming temperature for simultaneously thermosetting said polyester and thermosoling said dispersion dye whereby said dye in its solid phase sublimates and its vapor penetrates the molecular structure of said polyester to effect color fast dyeing of the chain and then washing said chain to remove said thickener.

Dependencies are inferred from the claim text.