Desiccant Dryer Dew Point Calibration and Karl Fischer Titration Verification
Dew point monitoring alone fails to guarantee dry resin; coulometric Karl Fischer titration per ISO 15512 Method B is mandatory to prevent hydrolytic scission.
Octabin Receiving Audit
Meaning
Quality control procedures establish the steps required to verify the integrity and correct specification of packaged bulk materials upon arrival at a processing facility. In polymer processing plants, octabin receiving audit involves inspecting the large heavy duty cardboard containers used to ship plastic pellets before they are unloaded or moved to the drying hoppers. This audit ensures that the resin has not been contaminated by moisture or dust during transit.
It also confirms that the correct resin grade has been delivered.
Inspection Protocol
Technicians must check the octabin for physical damage, punctures, or signs of water exposure on the outer cardboard walls. During the octabin receiving audit, the inner plastic liner is inspected to ensure it remains sealed and intact. Any breach in the liner can lead to humidity absorption, which would increase the time and energy needed to dry the resin.
Run Security
Documenting the resin batch number and comparing it with the certificate of analysis is a critical part of the process. If a wrong grade is fed into the silo, the entire production run could be compromised, leading to massive scrap rates or tool damage. This audit represents the last line of defense before the resin is introduced to the factory floor.
Quality Standard
Scrap and downtime costs are minimized when the material is audited on the dock. Recycled resin often requires tighter audit steps because of the risk of cross contamination from previous sorting errors.