Monday, 16 August 2021

Polymer Processing – Resin Moisture After Drying (Support Table)

 Hello and welcome to this blog post on resin drying before processing them. In this post I provide you with a drying table of the most used polymers which can support you in your processing operations.

A word on resin drying

If material is not properly prepared for processing operations such as injection moulding, the moisture will break down the polymer in the barrel at the processing temperatures. In general, this is referred to as hydrolysis.

This can occur for many different polymers, including:

-Polyamides (all types)

-Polyesters (PET, PBT)

-Polycarbonate

-Polysulfones

-Polyurethanes

 

There are five keys to remember which ensure good drying of resins [1]:

1. Pellet / regrind incoming moisture level

2. Air temperature

3. Dewpoint/ Desiccant

4. Residence time

5. Air flow

In this video below here, I discuss the topic of material drying and troubleshooting of moisture streaks in detail:

 


The table below shows the different maximum moisture levels after resin drying to ensure proper processing.

 

Table: maximum moisture content after resin drying of most used polymers

Thank you for reading and #findoutaboutplastics

Greetings,

Herwig

 #polymerprocessing #herwigjuster

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Literature:

[1] GE Plastics – Moulding Guide

[2] Saechtling Kunststoff Taschenbuch, Hanser-Fachbuch

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