Методические указания Новосибирск
and: There are two types of plastics. Thermoplastics are plastics. Thermosets are plastics. and/whereas /and
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| and: There are two types of plastics. Thermoplastics are plastics. Thermosets are plastics.
and/whereas /and: Thermoplastics will soften when heated. Thermoplastics will harden when cooled. Thermosets set on heating. Thermosets will not remelt. from/to: Plastics are used to make a great variety of products. Plastics are used to make textiles. Plastics are used to make engineering components. such as: Plastics are available in many forms. Plastics are available in the form of sheets, tubes, rods, moulding powders and resins. to: Various methods are used. These methods convert raw plastic into finished products. Compression moulding is a common method. Compression moulding is used for shaping thermosets. with/which: The equipment consists of a press. The press has two heated platens. The two heated platens carry an upper and a lower mould. then: Powder is placed in the lower mould. This is moulding powder. The upper mould is pressed down on the lower mould. to/which: The pressure and the heat change the powder. The powder becomes liquid plastic. The liquid plastic fills the space between the moulds. when/and: The chemical changes have taken place. The mould is opened. The moulding is extracted. by: Plastic bowls are made. The compression moulding method is used. 6.12. Translate into English. Как металлы, так и неметаллы обладают определенными свойствами, обусловливающими их пригодность для использования в конкретных целях. Хром может быть добавлен в сталь для повышения качества режущей кромки. На определенной стадии производства пластмассы жидкие, но в готовых изделиях они твердые. Материалы с низким коэффициентом трения используются для изготовления подшипников. Устойчивые к коррозии материалы используются в качестве защитного покрытия для металлов. Метод компрессионного формования используется для изготовления различных изделий из порошков. жүктеу/скачать 1.6 Mb. Достарыңызбен бөлісу:
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