Patent GB-1154751-A (GB)
Title: Iron-On Trim and Finding Textile Product and a method for manufacturing same
IPC: C09J7/35
Filed: 1966-06-29
Abstract: 1,154,751. Trimming. WM. E. WRIGHT & SONS CO. 29 June, 1966 [21 April, 1966], No. 29191/66. Heading B6G. [Also in Divisions B2 and B5] A method of making an iron-on trim or binding for a textile article comprises the steps of heating a polyester resin to a tacky but form stable condition, said resin having a plastic range from approximately 220 F. to a point in excess of 500 F. and having a viscosity not substantially less than 12,000 centipoises at 500 F. and about 175,000 centipoises at 350 F., extruding said resin on to the surface of the fabric web in the form of a filament and cooling said resin so that it is no longer tacky. As described the apparatus for carrying out the method comprises a screw type extruder 10 heated by any suitable means, e.g. by electrical band piece 12, the thermoplastic polyester resin being fed into the barrel of the extruder by means of a hopper 14. Two of said filaments are extruded from a die 18 on to the fabric web 20 which is unwound from a roll of fabric and then taken about a number of guide rolls 24, one of which is shown, then about an idler roll 26 to a position between chilled nip rolls 28, 30 by which the filaments are cooled and flattened; the nip roll on the resin side of the web is surfaced with polytetrafluoroethylene. From the nip rolls which are driven by means 31, fabric is taken about another idler roll to a take-up roll neither of which are shown. Means are provided for maintaining tension in the web; the nip rolls 28, 30 are cooled by circulating water through a concentric shaft arrangement. The polyester resins described are made by polymerizing the dimethyl esters of terephthalate and isophthalate acid with a diol which is either 1,4-butanediol or diethylene glycol, 1,4- butanediol in the presence of a suitable catalyst such as antimony oxide or calcium acetate hydrate. As shown the two flattened resin filaments are respectively near opposite edges of the fabric web and the iron on trim so produced is intended for hemming a skirt by first turning up the bottom to provide a hem 42 which is pressed in place by using an electric iron and thereafter the trim is positioned over the free edge 44 of the hem with one adhesive strip disposed below the edge 44 of the hem and the other in contact with the inner surface of the skirt; then by using the electric iron 46 the resin filaments are heated to a tacky condition for initial positioning of the hem and thereafter sufficiently heated so that the mass of resin is forced by pressure of the iron into the fabric of both the skirt and the fabric web of the trim. An indication that sufficient heat and pressure has been applied is provided by the resin penetrating through the fabric of the web to provide a visible line. The thickness of the fabric web to allow this is between 0À005 inch and 0À006 inch and the resin filament have a thickness of between 0À003 inch and 0À006 inch. The trim can be in the form of rick rack, i.e. a tape which is sinusoidal in plan view and on the back of which is disposed a narrow flat strip of the polyester resin; in such a case the tape is from 0À015 to 0À027 inch in thickness which is thicker than the fabric to which it is intended to be applied and the iron is applied to the fabric of the garment to iron the rick rack to the garment, the ironing being stopped when a line of the adhesive appears on the ironing side of the garment.