Rubber Hand Stamps and the Manipulation of Rubber A practical treatise on the manufacture of India rubber hand stamps, small articles of India rubber, the hektograph, special inks, cements, and allied subjects

CHAPTER V.

Chapter 5124 wordsPublic domain

INDIA RUBBER STAMP MAKING.

Mixed Sheet--Outlines of Moulding--Home-Made Vulcanizing Press--Further Simplifications of Same--Securing Accurate Parallelism of Platen and Bed--Distance Pieces--Wood vs. Iron as Material for Press--Use of Springs on the Home-Made Press--Metal Flask Clamps--Large Gas-Heated Vulcanizing Press--Preparing Type Model--The Matrix--Plaster of Paris and Dental Plaster as Substances for Matrices--Dextrine and Gum Arabic Solutions for Mixing Matrix--How Matrix is made--Shellac Solution for Matrix--Matrix Press and Spring-Chase--How to retard the Setting of Plaster of Paris--Oxychloride of Zinc Matrices--Talc Powder--Moulding and Curing the Stamp--Kerosene Heating Stove--Manipulation of Press--Degree of Heat--Simple Test of Curing--Time Required--Combined Matrix Making and Vulcanizing Apparatus--Chamber Vulcanizers--Object of Steam in Vulcanizers--Temperature Corresponding to Different Steam Pressures--Jacketed Vulcanizers--Gas Regulator--Flower Pot Vulcanizer--Fish Kettle Vulcanizer--Making Stamps without any Apparatus Whatever--Notes on Type, Quadrats and Spaces--Autograph Stamps 47