Vat Photopolymerisation Flashcards
1
Q
What is Vat Photopolymerisation?
A
Liquid photopolymer in a vat is selectively
cured by light-activated polymerization
2
Q
Subcategories?
A
- Laser SLA
2. Projection based SLA
3
Q
Laser SLA Process?
A
Laser scans liquid and causes the liquid to polymerise. The platform then moves down one layer, is recoated, and scanned again
4
Q
Projection based SLA Process?
A
Image projected using DLP/LCD from below and polymerises the given layer, the part then moves on layer up and repeated. Bottom up & top down
5
Q
Materials?
A
Based on epoxy/acrylic formulations of non-polymerised liquid
6
Q
Post processing?
A
- Support removal
- Cleaning uncured resin with TPM or alcohol
- Must be post cured to ensure complete polymerisation
7
Q
Strengths
A
Very Accurate 50-100µm Very good surface finish Mechanically & chemically smoothed, Painted, Coated Large build volumes possible Easy to remove support before curing Mats mimic engineering polymers Energy input is low
8
Q
Limitations
A
Curling Mat must be photo-curable Mat are hygroscopic Sunlight affecting appearance, mechanical prop Mat change = thorough cleaning Orientation affects finish Need to remove supports and post cure Trapped volumes
