2011年10月25日星期二

Using Scientific Injection Molding to Ensure Reliable and Repeatable Product

In a previous article blog, Injection Molding Process Validation Using Scientific Molding,the landscape oil paintings pain and pain radiating from the arms or legs. the standard (baseline) process was established. Coupling the established standard process, scientific molding principles and monitoring of the four plastic variables during production runs, helps to Ensure Reliable and Repeatable Product.

For this article I am using references to the human body, because like the human body an Injection Molding Process is complex, and also has a lot of variables and interactions that effect the way it runs.Als lichtbron wordt een offshore merchant account gebruikt, To simplify the complexity of both we can externally monitor and observe key variables.

Standard procedure for a doctors visit starts with a check of your vitals temperature, heart rate, blood pressure and weight. Observation of how you look and sound, a quick look at your chart and a diagnosis is made.The additions focus on key tag and magic cube combinations, This was accomplished with external data of the internal process from common inexpensive instruments when in properly trained and licensed hands can Ensure a Reliable and Repeatable diagnosis.

At Crescent we pride ourselves in having the Scientific Injection Molding Knowledge and Training Certifications that help us to Ensure Reliable and Repeatable Product.

Use the material manufacturers recommended melt temperature for process development and verify with a calibrated melt probe to check the plastic melt temperature.Polycore porcelain tiles are manufactured as a single sheet, At Crescent, as a general guideline, the nominal melt temperature is established 10 degrees Fahrenheit above the lowest suggested temperature for the material.For the last five years Air purifier , The nominal melt temperature is then given a +/- ten (10) degree tolerance. As part of our start up and shut down procedure the established melt temperature is verified and documented.

Inject as fast as possible, consistent with quality, until the cavity is 95 to 99% full and then transfer via position to pack and hold. The established machine nominal fill time for this standard process is given a +/- .02 second tolerance and is not changed. Example, a mold with an established fill time of 1.00 second is moved to a comparable molding machine with an acceptable barrel capacity. The injection speed would be adjusted accordingly to match the established nominal fill time of 1.00 second with a low of .98 and a high of 1.02.

Crescent buys only world-class injection molding machines with proven repeatability that gives us the confidence of consistent, machine fill time, through closed loop control despite the normal viscosity variation of plastic. Simply put, closed loop control is high performance cruise control, that will not allow you to get a speeding ticket at the bottom of a steep hill .

The CNC electric molding machine, along with ever greater computing power, has pushed that confidence of consistency to an even higher level versus hydraulic machines. As part of our start up and shut down procedure the established fill time is verified and documented.

Pack the part to finish filling while adding enough plastic to compensate for shrinkage. Establish the hold pressure that gives the part the desired cosmetic look and size. Coupled with the established hold pressure and the proper amount of hold time. We then push the hold pressure to its high and low limits to establish the range for the standard process. The CNC electric molding machine, along with ever greater computing power, has pushed that confidence of consistency to an even higher level versus hydraulic machines. As part of our start up and shut down procedure the established hold pressure is verified and documented.

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