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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  02 Mar 2016 02:54
We would like information on the procedures, tools, and frequency others are using to measure screw and barrel wear.  If using modified off-the-shelf gages, photos would be helpful.

Kim Tuckey
Posted:  03 Mar 2016 17:47   Last Edited By: Matrix Tooling, Inc.
You can purchase screw micrometers and telescoping barrel ID micrometers at supply houses such as, Plastic Process Equipment, Molder's Choice, and IMS.

Yearly checks (documented) can be done and life predicted. Some highly abrasive or corrosive resins may require more frequent checks.
Process monitoring of such parameters as cushion and charge time can also indicate problems in screw and/or barrels.

Brent Borgerson
Matrix Tooling- Matrix Plastic Products

Brent Borgerson
Posted:  04 Mar 2016 16:10
Also try Services For Plastics for bore gauges. For screw measurement, we use standard micrometers and made a plate that slides over the end of the micrometer shaft and is wide enough to bridge 2 flights of the screw. Measure screw and barrel at ambient temperature. If you give me your email address, I can send pictures of mics and inspection reports.

Nick Bandura
Posted:  05 Mar 2016 00:03
Brent is correct on where you can get the gages. Some things to watch out for is really getting the barrel clean to do this. It will look shiny but if you scrap you might still get black. Using a solvent swab after cleaning is good to see if it is clean. Also where you can get more wear is in the front and at the transition areas. Typically when you exceed the tolerances by double over the mfg build tolerances you need to prepare for doing something. Depending on the parts you are making you might just do a barrel sleeve versus a new barrel? I have done both in the past. Hope this is helpful.

Harold Colwell
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