Maro Publications

Injection Molding: Machines

Notes

Patent Abstracts

Patent Titles

*02/16/2015 
from 9/2/2013

Maro Encyclopedia

Injection Molding

Injection Molding: Applications

Injection Molding: Clamping

Injection Molding: Controls

Injection Molding: Blow Molding

Injection Molding: Runners

In-Mold Decorating

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Notes

1. “Injection molding (British English: moulding) is a manufacturing process for producing parts by injecting material into a mold. Injection molding can be performed with a host of materials, including metals, glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the cavity.[1]:240 After a product is designed, usually by an industrial designer or an engineer, molds are made by a moldmaker (or toolmaker) from metal, usually either steel or aluminum, and precision-machined to form the features of the desired part. Injection molding is widely used for manufacturing a variety of parts, from the smallest components to entire body panels of cars.

Parts to be injection molded must be very carefully designed to facilitate the molding process; the material used for the part, the desired shape and features of the part, the material of the mold, and the properties of the molding machine must all be taken into account. The versatility of injection molding is facilitated by this breadth of design considerations and possibilities.”

(Injection Molding, Wikipedia, 10/23/2013)

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2. "In plastic injection molding systems, an injection molding machine melts plastic material and then injects the molten plastic material through a machine nozzle into a mold cavity."

Goinski, US Patent 7,404,713 (7/29/2008)

                       injector1.gif (62719 bytes)

Figure from Underwriters' Website: http://www.cheresources.com/injectionzz.shtml

Diagrams courtesy of Plastics: Materials and Processing, Prentice Hall by A. Brent Strong

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3. Two Step Injection Molding

Injection molding is one of the most popular processes for manufacturing plastic products. In some cases, a molded part is modified by a second molding step.   Transferring a molding object is difficult and cumbersome preventing cost effective high volume molding.  .

Stanley, Bredall and Stiehl developed a transfer tool for two step injection molding process for high volume in which molded parts are transferred from one injection molding tool to another injection molding tool without separating the molded part from runners and without degating. The single step transfer, which can be performed without degating and without separating the molded parts from one another, can reduce cycle time as well as complexity.  The second tool has cavity spacing that matches the cavity spacing of the first tool and a device for removing the gate before the second molding.

8,894,399  (11/25/2014)
Injection molding tool with integrated gate removal for high-volume manufacturing

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Patent Abstracts

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Patent Titles

For earlier US Patent titles, go to Sorted Patents /Processing /Injection Molding Machines.

1/13/2015

8,932,040
Injection unit with a piston position measurement system

1/6/2015

8,926,315
Injection molding machine

8,926,303
Valve assembly for an injection molding machine

12/16/2014

8,911,228
Non-naturally balanced feed system for an injection molding apparatus

12/9/2014

8,905,751 
Molding machine having auxiliary ejection-assistance assembly configured to apply additional ejection force 

8,905,746 
Cleaning mechanism for an injection molding machine 

8,905,741 
Injection molding nozzle 

11/11/2014

8,882,486 
Control device for an injection molding machine 

11/4/2014

8,876,523 
Injection molding apparatus 

8,876,522 
Injection molding machine with integrated part handling apparatus 

10/28/2014

8,871,128 
Device and method for pressure control of electric injection molding machine 

10/21/2014

8,865,048 
Injection molding nozzle with dynamic seal 

10/14/2014

8,858,212 
Double color injection machine with shaft and disc 

10/8/2013 

2. 8,552,136 
Thermoplastic silicone-based polymer process additives for injection molding applications 

10/1/2013 

1. 8,546,490 
Injection molded article comprising polypropylene and polylactic acid 

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Interested!!
Bookmark this page to follow future developments!.
(RDC 7/16/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 9/2/2013.