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Adhesive
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About ADHESIVES FOR INDUSTRY & ADHESIVE BONDING
About Adhesives
About Bonding
Limitations
About Adhesives
HOT
MELTS ...Require
no energy for drying or mixing. They set quickly, with open time ranging from 5
seconds to 8 minutes, which eliminates the need clamps or fixtures. Offers long
term durability, resistance to moisture, chemicals.
ADHESIVE DISPENSERS A full range of
hot melt applicators including the highest applicator available. Also Spray
Tool, Electric or pneumatic, Bench Mounts, Hot Wheel Coaters and Bulk Hot melt
Dispensers.
EPOXIES/STRUCTURAL
ADHESIVES
...Welcome to the amazing world of Epoxy Patch Kits, Patch
Systems, Polyurethane Adhesives, Methacrylates and other bonding solutions.
CYANOACRYLATES
...The Instant Adhesive bonding metals to metals, rubber to metal, pre-assembled
plastic parts, porous materials such as foam rubber, wood, cork and leather.
``Product Purity makes the
difference with these cyanoacrylates.
UV ADHESIVE SYSTEMS...Lighting
the way to improved UV processing of adhesives and coatings using
equipment
designed to provide the exact light ``shaped" to your requirements, from small
intensive UV spot lights to larger flooded fields.
SEALANTS...High
quality polyurethane sealants provide excellent performance characteristics and
moving capabilities for industrial applications. Offering a unique combination of
toughness, adhesion long life, elasticity and water tightness.
AEROSOLS...Industrial Aerosol
Adhesives, Lubricants and Sprays for maintenance, fabric, foam, textile
screen printing, packaging, upholstery, furniture, floor covering. Silicone
lubricants for machinery. Pressure sensitive sprays.
CARTON SEALING
Get faster, stronger, carton set-up and
sealing with the hot melt assembly and
packaging systems. Compare the cost and the differences between hot melt versus
staples and tape.
METER/MIX AND MIXERS
...Meter/Mix Dispense Systems for structural adhesives. Features dispensing guns,
cartridges systems, and dual syringe applications along with motionless mixers.
MOLD RELEASE AGENTS
...For advanced composites,cultured marble and reinforced fiberglass, boat
building and rubber polyurethane molding.
ADHESIVE TECH
CENTER..A complete Tech center at your fingertips...For evaluations, trials, and
samples,
Call your
Adhesive Tech center at 1-800-323-5158 or
EMail
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ABOUT BONDING
ADVANTAGES of ADHESIVE BONDING -
Reprinted from
Ciba's User's Guide to Adhesives
The bond is
continuous. On loading, there is a more uniform distribution of stresses over the
bonded area. The local concentrations of stresses present in spot welded or
mechanically fastened joints are avoided. Bonded structures can consequently offer a
longer life under load.The bonded joint being continuous produces a
stiffer structure. Alternatively, if increased stiffness is not needed, the weight of
the structure can b decreased while maintaining the required stiffness. |
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Figure 1
Stiffening effect-bonding and riveting compared
The diagram shows how a joint may be designed to take advantage of the stiffening
effect of bonding. Adhesives form a continouus bond between the joint surfaces.
Rivets and spot welds pin the surfaces together only at localised points. Bonded
structures are consequently much stiffer and loading may be increased (by up to
30-100%) before buckling occurs.
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Figure 2 Stress
distribution in loaded joints
The riveted joint on the left is highly stressed in the vicinity of the
rivets. Failure tends to initiate in these areas of peak stress. A similar
distribution of stress occurs with spot welds and bolts. The bonded joint on the
right is uniformaly stressed. A continuous weld joint is likewise uniformally
stressed but the metal in the heated zone will have undergone a change in
strength.
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Adhesive
bonding gives a smooth appearance to designs: there are no protruding fasteners such
as
screws or rivets, and no spot weld marks.
The bonded
structure is a safer structure because, owing to the fewer and less severe
concentrations of stresses, fatigue cracks are less likely to occur. A fatigue crack
in a bonded structure will propagate more slowly than in a riveted structure or
even in a machined profile
because the bond lines act as a crack stopper.
Adhesive
bonding does not need high temperatures. It is a suitable means for joining togetheR
heat sensitive materials prone to distortion or to a change in properties from the
heat of brazing oR welding.
Complex
assemblies that cannot be joined together in any other way are feasible with
adhesives.Composite sandwich structures are a typical example.
Adhesives
can join different materials together materials that may differ in composition,
moduli, coefficients of expansion, or thickness.
The
continuous adhesive bond forms a seal. The joint is consequently leak proof and less
prone to corrosion.
The
adhesive bond can provide an electrically insulating barrier between the surfaces.
Adhesive
bonds have good damping properties. This capacity may be useful for reducing sound or
vibration.
Adhesive
bonding can simplify assembly procedures by replacing several mechanical fasteners
with a single bond, or by allowing several components to be joined in one operation.
Adhesive
bonding may be used in combination with spot welding or riveting techniques in order
to improve the performance of the completed structure. The riveted joint on the left
is highly stressed in the vicinity of the rivets. Failure tends to initiate in these
areas of peak stress. A similar distribution of stress occurs with spot welds and
bolts.
All these
advantages may be translated into economic advantages: improved design, easier
assembly, lighter weight (inertia overcome at low energy expenditure), longer life in
service.
The bond is
continuous. On loading, there is a more uniform distribution of stresses over the
bonded area. The local concentrations of stresses present in spot welded or
mechanically fastened joints are avoided. Bonded structures can consequently offer a
longer life under load.
The bonded
joint being continuous produces a stiffer structure. Alternatively, if
increased stiffness is not needed, the weight of the structure can be decreased while
maintaining the required stiffness.
Limitations
Adhesives are drawn from the class of materials which we know as'polymers', 'plastics'
or synthetic resins'. They have the limitations of that class. They are not as strong
as metals. (The difference is offset by the increased surface contact area provided by
the bonded joints.) With increasing temperature the bond strength decreases, and the
strain properties of the adhesive move from elastic to plastic. This transition is
usually in the temperature range 70180'C: the transition
temperature depends on the particular adhesive.
The
resistance of bonded joints to the in service environment is dependent on the
properties of the polymer from which the adhesive is made. Possible exposure of the
bonded structure to oxidizing agents, solvents, etc., must be borne in mind when
selecting the adhesive type to use. With most adhesives maximum bond strength is not
produced instantly as it is with mechanical fastening or with welding. The assembled
joint must be supported for at least part of the time during which the strength of the
bond is building up.
The quality
of the bond may be adversely affected if, in the bonding process, the surfaces are not
easily wetted by the adhesive. To ensure consistently good results may necessitate the
setting up of unfamiliar process controls. A badly made joint is often impossible to
correct. Bonded structures
are usually not easily dismantled for in service repair.
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