1.4 Adhesives Flashcards
What are the 4 adhesives
PVA, Contact adhesives, UV hardening adhesives, solvent cement
What types of material is PVA used to bond together?
Wood based materials and card
Why is PVA generally used for bonding parts for indoor products?
As it is not usually waterproof
Explain how PVA actually bonds two materials together.
PVA soaks into the wood fibres and sets when the water has been absorbed
Give one advantage and one disadvantage of the properties of PVA, when bonding laminates (within formers or a former and vacuum bag) for an indoor product.
Adv - No fumes, not toxic
DisAdv - Takes a while to set
What form of material is contact adhesive used to bond together?
Sheet material
Give an example of contact adhesive and its application within a kitchen.
Bonding chipboard to MF / PVC tiles
Explain why the two coated surfaces to be bonded are not immediately pressed together.
The solvent has to evaporate to leave the adhesive tacky
Do the surfaces need to be clamped with solvent cement?
NO
Give one reason why UV adhesive is widely used to join polymer and glass parts.
As it is a clear adhesive
Explain how UV hardening adhesives bond parts together.
The adhesive contains a photoinitiator that absorbs the UV and cures/sets the adhesive
What class of materials is solvent cement used to bond together?
Polymers
Give two additional advantages of using UV adhesives.
Single part adhesive
Can wipe the excess
It has a fast setting time
Give an example of specific material that could be bonded using a solvent cement.
Acrylic/PVC/ABS
Explain how solvent cements bond parts together.
Melts the connection between the 2 parts and joins them together
