TABLE OF CONTENTS From the outside, extrusion blow moulding looks simple, even though the machines may not. Yet the many variables interact, and fixing one problem can cause another. No, it s not really simple at all, but everything in blow moulding happens for a reason. A logical, thoughtful approach is the best approach to a problem.
In this chapter, the problems and solutions related to extrusion blow moulding will be considered. A method for problem solving, common causes of product defects, what to do if equipment malfunctions: including preventive and corrective actions. And because of it's potential to cause problems, material handling and packaging will be covered as well. We'll begin with problem solving.
Troubleshooting is figuring out what happened when there is a problem. While it may seem odd at first, the best troubleshooting procedure is not necessarily the quickest. It's the one that gets the right answer in the shortest time.
Good problem solving requires four steps:
Data collection is the first step. Get good information. Without it, solving a problem, except by luck, is impossible. That's why keeping good records is so important.
Interpretation is next. What does the information mean? Experience, or a good troubleshooting guide, will help to sort out what is important and what isn't.
Step three is taking action - doing something. Repair the machine, change a setting, try a different material to see what happens.
Check to see what happened as a result of the action you...
