Surface Treatments And Finishes
Muhtasari
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.
Malengo
- 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).
Ramani ya mawazo
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Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Surface Treatments And Finishes. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
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Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Surface Treatments And Finishes? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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