3.5 finishing tecchniques Flashcards
wood finishes
a
paint
varnish
sealants
preservatives
metal finishes
b
anodising
electroplating
powder coating
oil coating
galvanisation
cathodic protection
paper finishes
c
laminating
varnishing
hot foil blocking
embossing
paint
advantages
disadvantages
a
Gives protection as a surface coating. Protects from weathering Provides a colourful and decorative effect. Available in tins and spray cams. Can be dipped for quick coverage.
Preparation required
Many coats may be needed
Some materials will need repainting on a regular basis.
varnish
advantages
disadvantages
a
Indoor or outdoor uses.
Shows off the natural finish of the material.
Tints can be applied to alter the colour of the wood.
Preparation required.
Regular maintenance may be required.
Sanding required between coats.
sealants
advantages
disadvantages
a
Dries quickly.
Seals the surface of the material or finish.
Can be made or pre-mixed?
Preparation required.
preservatives
advantages
disadvantages
a
Preserves the wood from insect attack and weathering.
May contain VOCs
anodising
advantages
disadvantages
b
Durable and will not flake.
Easy to maintain.
Ease of fabrication.
Colour sustainability
Limited colour selection
electroplating
advantages
disadvantages
b
Corrosion resistance
Decorative
Cheaper ornaments
Improving mechanical characteristics
Non-uniform plating
Cost: the process is costly and time-consuming.
Pollution potential: the electroplating solution, after use, needs to be disposed off safely and is a cause of
environmental concern.
powder coating
advantages
disadvantages
b
High quality
Durable finish
Range of colours
100% in material use – no waste.
Difficult to obtain a thin film
Slow colour change
oil coating
advantages
disadvantages
b
Rust prevention
Temporary
Needs to be removed before other treatments are
used.
galvanisation
advantages
disadvantages
b
Forms a barrier that prevents corrosive substances
Scratch protection
It Will wear off eventually
cathodic protection
advantages
disadvantages
b
Simple
Reliable
Low installation costs for short term protection
applied to existing structures to prolong their life
Response to varying operating conditions is limited
laminating
advantages
disadvantages
c
Good gloss Strength Low cost Surface protection
Water ingress through the sides, as they are not sealed
(unless encapsulated)
varnishing
advantages
disadvantages
c
UV dies instantly Gloss finish High impact Added value Can spot varnish for impact
Can take an hour to dry is not UV varnish.
UV varnishing is expensive (set up costs)
hot foil blocking
advantages
disadvantages
c
Stands out Premium branding Creates a Bespoke feel Gives of a professional look Enhances your design 100% opaque
Added cost Not very cost-efficient Hard to get right Image can spread Limited colours Requires special press tools to be made
embossing
advantages
disadvantages
c
Creates dimensional depth and detail
Gives visual and tactile effect
Adds cost to the printing job
Thin serifs do not emboss well
anodising
b
Anodising is an electrolytic process
used to increase the thickness of the
the natural oxide layer on the surface of
metal parts.
electroplating
b
Electroplating is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal.
powder coating
b
Powder coating is a dry finishing
process. Used as functional
(protective) and decorative finishes.
oil coating
b
metal surfaces which require to be protected until brought into use, or receive inter-stage protection prior to further assembly or processing. They maybe finished metallic parts, which need to receive some form of protection from corrosion during shipping or storage or they may require some form of protection from corrosion whilst in use.
galvanising
b
Galvanisation is the process of applying
a protective zinc coating to iron or steel,
to prevent rusting. The most common
the method is hot-dip galvanizing, in which
steel sections are submerged in a bath
of molten zinc.
cathodic protection
b
Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead of the protected metal.
Laminating
c
Laminating applies a transparent plastic film to the
the surface of the paper and board.
Varnishes
c
Fine varnish can be sprayed on to the surface of card.
When dry this gives a gloss finish and helps protect
the printing underneath.
Other additives can be used e.g.
UV sparkle varnish – includes metallic flakes
Fragrance burst inks – for ‘scratch and sniff’
Silver latex – for scratching off
hot foil blocking
c
In its simplest form, Foil Block Printing (sometimes
called Hot Foil Stamping) is where a pre-glued
metallic foil is pressed by a heated die, into the
the surface of a material.
embossing
c
Embossing and debossing are the processes of
creating either raised or recessed relief images and
designs in paper and other materials. An embossed
the pattern is raised against the background, while a
the debossed pattern is sunken into the surface of the
material
