Peperiksaan Akhir Sme2713 Plastic

  • October 2019
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Soalan 5 (20 markah) a) Senaraikan dua (2) kategori termoplastik. Seterusnya senaraikan tiga (3) perbezaan di antara kedua-duanya. (5 markah)

b) Jelaskan dua (2) tujuan utama bahan campuran plastik digunakan dalam industri pembuatan produk plastik. (2 markah)

c) Rajah S5(c) menunjukkan satu produk botol minuman. Dengan lakaran yang sesuai terangkan dengan ringkas proses pembentukan produk tersebut dan satu (1) jenis bahan plastik yang biasa digunakan. Berikan dua (2) kebaikan dan dua (2) kelemahan proses ini. (7 markah)

Rajah S5(c) d) Terangkan salah satu daripada proses berikut; i. Pengacuanan suntikan plastik haba, ii. Pengacuanan mampatan. Dari segi; -

Lakaran proses.

-

Peringkat-peringkat yang terlibat.

-

Kelebihan proses. (6 markah)

-2(SME 2713)

Question 5 (20 marks) a).

List two (2) categories for thermoplastic. Then give three (3) differences between both of the categories. (5 marks)

a) Explain two (2) main objective of using plastic mixture materials in industry of plastic manufacturing. (2 marks)

b) Figure S5 (c) shows the product of drinking bottle. With the aid of proper sketch, briefly explain the forming process of the product and one (1) type of plastic material that was normally used. Give two (2) advantages and two (2) disadvantages of this process. (7 marks)

Figure S5(c) c) Explain one of the following processes: i. Heat plastic injection molding; ii.

Compression molding.

In terms of; - Sketch of the process. - Stages that involved. - Advantage of the process. (6 marks)

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