Copyright © 2012 Chiswick Polish
Cherry Blossom Shoe Polish
Dan & Charles Mason, pioneers of the shoe polish industry in Chiswick
Around the Works, "Tin Stamping" Process
The tins we produce are grouped into two classes--'seamless' and 'built-up,' the seamless type being made for the smaller sizes of polish and built-up tins for amounts varying from 1/2lb, to 14lb.
Seamless tins are stamped either on single-die or the larger gang-press, the later being capable of cutting two to five tins at a time, dependent on size. The pictures below on your left, show the two types of press.
In the upper photograph the operator is producing lids on a gang-press and has just placed a sheet of plate on the semi-automatic machine table.
From the sheets remaining in the tray at her side it will be seen that the plate is printed in ten lines, four lids to a line. By moving one of the hand-levers, the operator projects the plate forward and the first line of printed circles falls directly beneath the cutting tools.
In a split-second action the tools move downwards, stamping out the four circles,
which are then held in position while the metal that will form the sides of the tin is 'drawn' into shape between two surfaces.
The formed lids are then freed and a swift movement of the operator's second lever causes the printed plate to shift into a new position for the stamping of the next line.
In the opposite lower picture, bodies (the part that will contain the polish) are being stamped on a single-die press. The operator is using strips of coated metal, previously cut from large sheets by slitting machines. She feeds the prepared strips by hand into the cutting tool and the bodies are stamped one at a time. The large picture at the beginning of this article shows the rear of a single-die press with formed bodies falling from it.
After stamping, lids are conveyed to machines for ' ringing ' and ' curling ' --a process of rolling the open edge. Bodies are ' beaded ' and curled. (Beading means forming a ledge in the body which will prevent the lid from slipping beyond the point intended when placed on the filled body,)
Then the bodies are carried to the final machine, where the opener, formed out of strip, is attached.
Built up tins are made from sheets of plate cut to required lengths and widths. The corners of these pieces are trimmed and the ' blanks ' are curled on rollers. The circular shapes are then placed in a side-seaming machine where, in one operation, they are seamed and locked. At each end of these cylinders, flanges are formed and the rings and bottoms, previously stamped in single-die presses are spun on to the flanges.
Very little intermediate handling is necessary drying operations. In most cases, tins run into chutes and are raised in elevators to be conveyed by gravity to the next machine. After the last process the tins are collected in chests in which they are stored until they are required for filling by the Polish Department.
This article first appeared in the Vol. VIII No 6 Spring 1954 ' Forward ' The house magazine of Chiswick Products Ltd,