wood adhesive joint

8/16/2019 Wood Adhesive Joint

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• An adhesive, also known as glue, is a material, typically liquid or

semi-liquid, that adheres or bonds items together. Adhesives come

from either natural or synthetic sources.

• Wood joinery is one of the most basic concepts in woodworking.

• If one didn't have the ability to joint two pieces of wood together in asolid fashion, all woodworking pieces would be sculptures, carved out

of a single piece of wood.

• However, with the many varied types of wood joinery, a woodworker

has a number of different joints in his arsenal from which to choose,based upon the project.

• If you master these wood joinery concepts, you'll be well on your

way to becoming a very accomplished woodworker.



Wet adhesives

• Wet adhesives are applied to only one side of the assembly, which is thenimmediately stuck to the other side. The parts need to be held together whilethe solvent evaporates. In "solvent-free" adhesives, the carrier substance iswater. Wet adhesives dry best when used with open-pored materials.

Contact adhesives

• Contact adhesives are applied to both sides of the assembly. After adesignated evaporation time the parts are put together for an immediatebond which can rapidly resist stress.

Reaction adhesives • Reaction adhesives are adhesives that harden as a result of a chemical,

physical or catalytic reaction. Depending on the type of reaction, theseadhesives may be single- or two-component adhesives.



• A longitudinal edge joint formed by fitting together rabbeted

boards.

Double Rabbet

Cut on both mating ends or

edges of the work piece.

Overlap Rabbet

Cut on one board so it will fit over the

entire square end or edge of anotherboard.



ADVANTAGE DISADVANTAGE

• Used in the furniture business because they

are strong enough (because more glue

area) to put up with the constant forces of

opening and closing.

• Takes some time to set up

• These joints are Rabbet joints are easy to

make if you have power tools that can

ensure precise measurements

• Requires more skills

• Hides some end grain



Mortise & tenon joint

Disadvantages - Time consuming to make

Uses - Hidden furniture joints

Advantages - A very strong and versitile

joint

Dowel joint

Advantages - quick to make and very

strong

Disadvantages - Needs a jig to be used

to drill parts accurately

Uses- Hidden furniture joints



Butt joint

Advantages - easy to make, especially

with mitre saw

Disadvantages - weak- needs to be

strengthened with nails or screws

Uses- rough construction work such as

fencing & model making

Mitre joint

Advantages - neat and an attractive joint

Disadvantages - weak unless reinforced,

needs mitre saw to make accurately

Uses- picture frames & small boxes



Corner housing joint

Advantages - quick and easy to cut with

saw; fairly strong

Disadvantages - can be unsightly, best if

reinforced with screws or dowels

Uses- Hidden furniture joints

Comb finger joint

Advantages - very strong to to surface

area being glued

Disadvantages - Needs a jig to be cut

accurately

Uses- drawers and corners of boxes

frames



Dovetail joint

Advantages - strong and a flexible joint-

good for natural timers

Disadvantages - takes a long time tocomplete

Uses- drawer corners

Housing joint

Advantages - strong joint as the materials

interlock- glue provides added

strength

Disadvantages - time consuming to make-

accurate cutting required using a chisel

or can use a router for more speed

and consistency

Uses- shelves or division in a box.



ADHESIVE

• Polyvinyl Acetate

EXPLAINATION

• Probably know it AS white glue/aliphatic resins

• strong-binding and water-soluble.

• Best used on smaller jobs where it can be applied in coolertemperatures so it doesn't soften too much.

• Removal and cleaning of this wood glue requires just soap and warmwater.



PVAc is primarily a synthetic resin polymer, which, due its non-

polar nature, is insoluble in water, oils, fats, or gasoline. On theother hand, it is soluble in alcohols, ketones, and esters.



Hot-melted adhesives

• These are available in the form of sticks, paste, powder,

granulate, mesh and film. They contain no solvent. No mixing or

dosing is usually necessary. They are melted by applying heat.

Two-component reaction adhesives

• These are adhesives that, depending on their type, are made of

components in liquid, paste or powder form. The componentsmust usually be mixed in exactly the stated proportions.

hot melt adhesivecontact adhesive



• PRF adhesives are classified as thermosetting polymers and are

produced by a condensation polymerization between

formaldehyde, phenol and resorcinol.

• Uses for load bearing constructions, outer doors, dovetail joint

• 2or 3 system(glue + hardener)

• Hot and cold press

• Dark glue joint

•

Very high heat resistance• Highest water and chemical resistance among wood adhesive



• Polyurethane glues are great for strength and the efficient

choice for outdoor projects.• If gluing end grain, polyurethane glue will make a strong

joint. It is more expensive than standard wood glue in

addition to other drawbacks.

• Polyurethane glue expands as it dry, which means it shouldnot be used in excess. Additionally, gloves need to be worn

when using it and adequate ventilation needs to be

available.

• Drying time is approximately 45 minutes, and clamped piecesneed to remain clamped for six hours.



Joining wood: Frame joints

• Choosing a suitable joint for a frame is important as many

structure that are manufactured often require a load to be

supported. In the case of a beach chair the joint will support

both a static and dynamic load so a strong interlocking type

joint is required.

• A well fitting frame joint often requires very little adhesive to

be used to secure. Frame joints are most commonly used on

chairs, doors and tables.



Bookcase



Drawer



Dining Table



Edge to edge butt woodworking joint

Edge to face butt woodworking joint



End to edge frame butt woodworking joint

End to face butt woodworking joint



Face to face butt woodworking joint



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