Surface Treatments And Finishes
Akopọ
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.
Awọn Afojusun
- 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).
Àwòrán ọpọlọ
A ti ṣe àwòrán kókó yìí kí o lè rí bí àwọn èrò ṣe so pọ̀.
Ṣí àwòrán ọpọlọ nínú áàpù
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Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Surface Treatments And Finishes. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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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Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Surface Treatments And Finishes? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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