Presentation on theme: "Plastic Can you think of advantages or disadvantages of using plastics in our daily lives? Can you name different products made out of plastic ?"— Presentation transcript:
Plastic Can you think of advantages or disadvantages of using plastics in our daily lives? Can you name different products made out of plastic ?
Plastics Task – name 10 objects made of plastic that is in close proximity to you.
Plastic how do we use plastics in our homes? Photographs below courtesy of
Can you think of ways we use plastics in: Plastic packaging Can you think of ways we use plastics in: entertainment
Thermoplastics Plastic This material is man made and is a by product of the oil industry. There are two types of plastic : Thermosetting
These are described as plastics that can be reformed using heat : this plastic has a memory, it returns to its original flat shape when re-heated. Here are some examples and their uses : Acrylic – available in almost any colour in sheet rod or tube form, can be shaped using a line bender or vacuum former. ABS – a very commonly used plastic can be injection moulded from a powder form. Thermoplastics materials Styrene – very good for vacuum forming. thermoplastic resin. Polypropylene ABS.
Polyester resin – poured into moulds to make products or for boat repair Thermosetting materials These are described as plastics that do not reform using heat, they “SET” and cannot be reshaped. Urea formaldehyde – electric plugs and sockets Melamine – kitchen worktops, unbreakable drink mugs Here are some examples and their uses : Harry Allen’s paper weight/doorstop made from resin Kettle saucepan handles
Materials – Plastics Plastics are synthetic resinous substances that can be moulded with the help of heat or pressure. There are two main classes of plastics: Thermosetting – plastics that can only be heated and be moulded once. If re-heated they cannot soften. Thermoplastics – plastics that are moulded by heating and can be remoulded if heated again. Thermoplastics soften when heated and can be shaped when hot. The plastic will harden as it cools down. ThermoplasticThermoplastic properties Thermoplastic usesExample outcomes Acrylics or Perspex (Polymethyl Methacrylate) Stiff, hard, shiny, brittle in small sections, durable, scratches easily, available in different colours, good electrical insulator Used for signs, key rings, lighting, storage containers High impact polystyrene (HIPS) Light but strong plastic, available in sheets in a variety of thicknesses and colours and softens at about 95 degrees Used for vacuum forming and making outer casings and packaging for products AcetateHard, shiny and translucent/transparent Used in badge-making, packaging and for overhead projector transparencies Expanded polystyrene (styrofoam) White, lightweight and crumbly Used for protective or insulating packaging Materials - Plastics
Materials – Plastics ThermoplasticThermoplastic properties Thermoplastic usesExample outcomes Polypropylene (PP)Light, hard, flexible but can scratch easily. Durable to wear and has good resistance to chemicals Used for different kinds of packaging, chairs, gadgets, textiles and automotive components Low density polyethylene (LDPE) Soft, flexible, good resistance to chemicals, good electrical insulator, tough Used for packaging film, carrier bags, bottles, toys High density polyethylene (HDPE) Hard, stiff and strong. Able to be sterilised Used for plastic bottles, tubing and household equipment Corrugated plasticLightweight, rigid and weatherproof Used for sign boards and folders Low-tack masking filmFlexible and transparentUsed to position sticky- backed vinyl letters or images onto a chosen surface. Used for creating signs, stencils and vehicle signage Polyvinyl chloride (PVC)Stiff, hard wearing, brittle but can be treated to make it softer and more rubbery Used for blister packs, window frames, records and clothing Materials - Plastics
It’s just another plastic bag!
Are there any problems or issues with using carrier bags ? Task 1 – in smalls group, list three advantages and disadvantages of using carrier bags. Task 2 – in your group consider two ways of improving any problems that you have identified.
How many supermarket carrier bag does the average shopper use to carry goods home every week? Supermarkets hand out 1.75 billion bags a year How could this number be reduced?By using shopper bags, how many carrier bags could we cut down on using in a year? 20 plastic bags a week x 52 weeks = 1,040 Shopper bags
2 million mobile phones are expected to go on the scrapheap during a Christmas period. 11 million people expect to get a new mobile phone over Christmas in the UK. What can be done to improve this? What happened to your old mobile phone? Just one more phone …it won’t matter.
Plastic and sustainability aspects. Before we use plastic materials aspects for consideration Plastic is a precious resource made from oil. Because it is such a versatile material, we use it a lot. 2. List 5 plastic products that no-one should ever bothered making. Working in small groups – discuss the following and feed back to the class. 3. List 5 plastic products that would be better made from a different materials. 1. List 5 products where plastic is the best material to use. Photographs courtesy of photo gallery wales.