In case you’re still confused about how the process of injection molding can assist your company in mass producing plastic parts, you’re not alone. Injection molding is a meticulous process requiring expensive, precision based machinery and expertise. As explained in one of his latest videos, Bill Hammack (aka the engineerguy) breaks down this process step by step, conveying a brief history as well as an in depth analysis of how modern day injection molding techniques are used to create everything from plastic chairs to cases for consumer electronics.
One need not look far to see the impact of plastic molding in their everyday life, but what some may not understand is that it’s a process that’s taken considerable amounts of time, energy, and resources to perfect. For the uninitiated, injection molding is just another monotonous process that so many take for granted. Oftentimes, the average Joe fails to realize the countless hours that have been spent by engineers on the most minute details, perfecting design and engineering aspects of machinery that the public will never see.
In his YouTube video, Hammack illustrates the fine points and aesthetics of the early injection molding machine, disclosing it’s inconsistencies due to plastic’s poor thermal conductivity in combination with a slipshod plunger and heated barrel apparatus, that was eventually remedied with one of the plastic industry’s most significant inventions, the reciprocating screw.
Detailing current plastic molding processes from start to finish, Hammack highlights his presentation with an example of how lego bricks are created. Designed for children, lego bricks are manufactured using the modern heat distribution system, known as hot runners, a technique also employed at Paxon Plastic. Although more expensive than traditional cold runner counterparts, hot runners are more efficient and create less inconsistencies in the final mold of a product. By concluding with the lego brick, Hammack demonstrates the need for injection molding for even the most mundane of plastic products in today’s plastic manufacturing landscape.