Knowledge · Machines & Selection
Machines & Selection
How to size, specify and audit a twin screw extruder before money changes hands: screw diameter and L/D, vent position, factory acceptance tests and a supplier scoring method that runs on documents, not on marketing claims.
- Twin Screw Extruder Size Chart: 16 mm to 135 mm, 1 to 4,000 kg/h
The complete model table with screw diameter, speed, motor, torque and reference output — plus how to read it without over-committing on capacity.
Machine & selection · 6 min read - How to Specify Twin Screw Extruder L/D Ratio by Formulation
L/D is process length, not a quality score. The table gives the band we quote by filler level and additive count, plus four questions that expose an inflated L/D claim.
Machine & selection · 9 min read - Where the Vacuum Vent Belongs on a Twin Screw Extruder
A vent only works after a melt seal. Barrel-by-barrel placement, the five failure symptoms and the three measurements that prove devolatilisation works.
Machine & selection · 8 min read - Twin Screw Extruder FAT: A Ten-Step Acceptance Protocol
A valid FAT runs your formulation, holds output for 30 minutes and weighs scrap in kilograms. The full protocol with acceptance criteria, usable with any supplier.
Machine & selection · 10 min read - How to Compare Twin Screw Extruder Suppliers Without a Ranking
Score suppliers on documents: process map, torque curve, scrap figure, spares lead time. A weighted scoring method and three questions that separate OEMs from assemblers.
Machine & selection · 9 min read - Triple screw vs twin screw: where three screws win
Three mesh zones buy splitting events, not horsepower.
7 min read
FAQ
What should I fix before requesting quotations?
Three things: the formulation with exact additive and filler percentages, the target output at a real screw speed, and the acceptance criteria you will test at FAT. Send all three with the RFQ and the quotations become comparable.
Which page should I read first?
Start with the size chart for the machine class, then the L/D page to check the processing section, then the FAT protocol before you shortlist. The supplier comparison page ties the three together.
Other sections: Process & Formulation · Service & Operation · Twin screw extruder range · free line quotation