Surface Treatments And Finishes
Gbogbo ọrọ náà
Two identical steel gates are hung on the same day. One was wire brushed, degreased, primed and given two coats of paint. The other was painted straight out of the workshop because the job was late. Both look the same on the day. Eighteen months later the second gate is lifting in blisters and rusting underneath, and the paint on it was the same paint. The finish did not fail. The preparation did.
This lesson takes surface treatments and finishes as the specification does: as preparation and application, applied to enhance functional and aesthetic properties. You will learn printing, embossing and ultraviolet varnishing for papers and boards; painting, varnishing and preserving for timber based materials; dip coating, powder coating and galvanizing for metal based materials; and polishing, printing and vinyl decals for polymers. Each one is a decision with a cost, and the questions on this topic ask which finish and why. This is the last of the nine specialist technical principles, examined in Section B of Paper 1, and it appeared on the specimen paper as a column of its own.
Ebumnobi
- The preparation and application of treatments and finishes to enhance functional and aesthetic properties.
- Papers and boards (printing, embossing and UV varnishing).
- Timber based materials (painting, varnishing and preserving).
- Metal based materials (dip coating, powder coating and galvanizing).
- Polymers (polishing, printing and vinyl decals).
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Surface Treatments And Finishes. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Galvanizing protects steel because zinc A. is harder than steel. B. corrodes in preference to the steel. C. is a better conductor than steel. D. is cheaper than paint. Answer: B
- Which finish is applied to papers and boards to give a hard, high gloss, scuff resistant surface? A. Dip coating B. Embossing C. Preserving D. Ultraviolet varnishing Answer: D
- In powder coating, the powder is attracted to the part because it is A. heated until it melts. B. dissolved in a solvent. C. given an electrostatic charge. D. sprayed under high pressure. Answer: C
- Which treatment is used on timber that will be in contact with the ground? A. Embossing B. Polishing C. Preserving D. Powder coating Answer: C
- Which finish for polymers requires no tooling and can be removed and replaced? A. In-mould decoration B. Pad printing C. Screen printing D. A vinyl decal Answer: D
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Surface Treatments And Finishes? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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