Sources and origins (AQA GCSE Design and Technology): Flashcards

Initial stage where tree trunks are cut into usable planks

Cost-effective but poorer quality; prone to cupping/twisting

Higher quality timber; better stability; shorter annual rings visible

Timber bends across width of grain, creating curved surface

Timber spirals along its length

Cracks at end of planks as wood dries and contracts

Separations along grain following natural growth lines

Areas where branches grew; structural weakness

Reduces moisture content in converted timber planks

Approximately 15%

One year for every 25mm thickness of timber

Faster, controlled, kills insects, better moisture control

Processed wood materials combined with adhesives

MDF, plywood, chipboard