Pultrusion

Question 1

What typically must be adjusted to control rate of reaction?

Answer 1

Temperature since the resin system does not have catalyst, inhibitors, or other
chemical that a free radical polymerization could have.

Question 2

What are the three stages to the pultrusion machine?

Answer 2

Components that heat and consolidate the part, equipment to pull and equipment
to cut the pultrusion.

Question 3

What are the two main categories of products made from pultrusion?

Answer 3

Solid rod and bar stock

Question 4

What are three common curing methods?

Answer 4

Three common curing methods are die curing, tunnel-oven curing, and split die
method

Question 5

What are three advantages of pultrusion?

Answer 5

High throughput rate “finished project”, low process waste, ability to use a variety
of reinforcements, can fabricate extremely large parts at any desired length

Question 6

What are two methods of resin impregnation?

Answer 6

Dip bath and custom resin baths

Question 7

What are the different types of pullers?

Answer 7

Intermittent-pull reciprocating clamp, Continuous-pull reciprocating clamps, and
Continuous belt pullers.

Question 8

What are 3 common types of reinforcements?

Answer 8

E-glass, S-glass, Carbon/graphite, Aramid

Question 9

What are 3 types of low-viscosity resins?

Answer 9

Polyester, Vinyl Ester, Epoxy

Question 10

What resins are better controlled in pultrusion process?

Answer 10

Resins that cure through free radical polymerization.

Question 11

What are three disadvantages of pultrusion?

Answer 11

Difficulty in maintaining tight tolerances with shrinkage of 2% - 3% commonly,
difficult to control cross-section dependent (variation in thickness), straightness
along length, lateral and bowing, quick curing resin systems typically have lower
mechanical properties (minimal crosslinking), complexity of process, parts are
run resin rich to account for fiber anomalies, strength is sacrificed, voids may
result in parts if excessive opening given at die entrance,