Plastic Molding
Plastic Molding[img]http://ecx.images-amazon.com/images/I/41bH-ocnd9L.jpg[/img]
Plastic Molding
By Louis F. Rahm
Publisher: Frederiksen Press
Number Of Pages: 220
Publication Date: 2007-03-15
ISBN-10 / ASIN: 1406745243
ISBN-13 / EAN: 9781406745245
Binding: Paperback
PLASTIC MOLDING AN INTRODUCTION TO THE MATERIALS, EQUIPMENT AND METHODS USED IN THE FABRICATION OP PLASTIC PRODUCTS BY LOUIS F. RAHM Assistant Professor of Mechanical Engineering, Piinccton Inirersity FIRST EDITION FOURTH IMPRESSION McGRAW-HILL BOOK COMPANY, INC. NEW YORK AND LONDON 1933 PREFACE The art of forming objects in molds is ages old, embracing, as it does, the casting of metals, the blowing of glass, and the shaping of clay subsequently finished by baking. Although industries founded on this knowledge have persisted for centuries with little change in method or equipment, the molding of plastics, being dependent upon a machine age, is a relatively new-born industry. Founded on the molding of natural plastics, this industry showed little development before the intro duction of synthetic materials. These newer plastics, almost unlimited in supply and having in many cases desirable properties not found in natural materials, have opened up new fields of application for molded products. The most remarkable development has come about in the manufacture of precise parts suitable for electrical insu lation and mechanical uses. In these fields particularly, the phenomenal growth of the industry during the past twenty years has been due to the class of synthetic materials known as thermosetting plastics. In writing this book the author has attempted to present a general view of the methods and equipment used in the industry, in the interest of the manufacturer, the user of molded products, and the general reader. Particular stress on the molding of thermosetting plastics may be justified by the present importance of such materials and the probability that future plastics will be handled with substantially the same methods and equip ment. In regard to the materials discussed, in view of the volumes available on this phase of the subject, viii PREFACE detailed chemical data have been considered unwarranted in a text of this scope. For much detailed information and for the generous loan of illustrative material the author wishes to acknowl edge the important contributions of Mr. Charles F. Burroughs and Mr. Walter E. Rahm, of the Burroughs Engineering Company. Other contributions are acknowledged as they occur throughout the book. Louis F. RAHM. PRINCETON, NEW JERSEY, Xcptcinbrr, 1033. CONTENTS PAUK PREFACE . vii PART I THE MOLDING PROCESS AND THE PLASTICS CHAPTER I THE MOLDING PROCESS. . 3 Momentary Process Variations of Process Tablctmg In - serts-Heating Media Pressure Media. CHAPTER II THK PLASTICS 15 Rubber Shellac Pyroxylin Phenol-formaldehyde Casein Urea-formaldehyde Cellulose acetate Conclusion. PART II MOLDS CHAPTER III TYPES AND USES . . 51 Flash Positive Semipositive Subcavity Floating Chase-Stripper Plate Split Injection Blowing Conclusion CHAPTER IV STYLE . ... . 74 Size Operation Heating. CHAPTER V GENERAL DESIGN DETAILS 85 Materials Mold Pressure Flash Surface--Wall - Thickness-Draft Retaining Ejector Pins Inserts Shrinkage--Finish ing and Hardening. CHAPTER VI SPECIAL DETAILS. .... . 97 Semiautomatic Molds Unit Construction Built-up Molds Type Details Hand Molds. ix x CONTENTS CHAPTER VJJ PAOE DIE HORBIVG . 127 The Robbing Process Preparation of Hob Preparation of Blanks The Hobbing Operation Finishing of Dies. PART III OPERATING EQUIPMENT CHAPTER VIII MOLDINO PRESSES 141 Hand-molding Units Semiautomatic Presses Tilt ing-head Presses Angle-molding Presses-Mechanical Presses Miscel laneous Presses. CHAPTER IX ACCESSORY EQUIPMENT . . 163 Hydraulic Systems Pumps-Accumulators Piping and Fit tings Valves Packings Stripping Presses Tablet-ing Ma chines Finishing Machines Preheating Equipment Hobbing Presses-Steam Boilers. PART IV THE MOLDING PLANT CHAPTER X PLANT EQUIPMENT . 183 Selection of Equipment Plant Layout Installation Oper ation - Maintenance Conclusion. APPENDIX . . 205 ItlBLIOUHAPlIY . . ... 241 INDEX ... . 243 PART 1 THE MOLDING PROCESS AND THE PLASTICS CHAPTER I THE MOLDING PROCESS Elementary Process...
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