Engineering plastics – The Manual - F.wood-supply.dk

Bonding
Bonding technology is a very efficient joining method
which permits plastics to be permanently joined to themselves
or other materials. The chemical joining (bonding)
of components offers a range of benefits compared to other
joining methods:
ˌˌEven distribution of stress
ˌˌNo damage to materials
ˌˌNo warping of joined parts
ˌˌDifferent material combinations can be joined
ˌˌThe separating joint is sealed at the same time
ˌˌA smaller number of components is required
Decisive factors for a good bonded joint:
ˌˌMaterial characteristics
ˌˌAdhesive
ˌˌAdhesive layer
ˌˌSurface (preliminary treatment)
ˌˌGeometric design of the bonded joint
ˌˌApplication and load conditions
To increase the strength of a bonded joint, it is advisable to
pre-treat the surfaces when bonding plastics in order to enhance
surface activity.
ˌˌCleaning and degreasing the material surface
ˌˌIncreasing the size of the mechanical surface by
grinding or sand blasting (particularly recommended)
ˌˌPhysical activation of the surface by flame, plasma or
corona treatment
ˌˌChemical etching for the formation of a defined
boundary layer
ˌˌPrimer application
When bonding plastics, tension peaks should be avoided
and a compressive, tensile or shear load should preferably
be applied to the adhesive bond joint. Avoid flexural, peeling
or plain tensile stresses. Where applicable, the design
should be adjusted so that the bonded joint can be configured
for suitable levels of stress.
When bonding plastics, tensional
load should be avoided and a compressive,
tensile or shear load should preferably be
applied to the adhesive bond joint.
Avoid flexural, peeling or plain tensile
stresses.
Source: DELO Industrieklebstoffe
82