A+novelty+seating+unit+for+use+in+children’s+nurseries.

What Properties must a material have for the design? I think the material needs to be tough so that the chair remains in the same shape permanently. Ducilty, Malleabilty and plasticity are need to form the shape of the chair without damaging it (if working with plastics) The Chair needs to be Sustainable and enviromentally friendly. The chair must be durable to last a long time.

What Types of materials could be used for construction of novelty seating?
 * || **Hardwood** || **Manufactured** || **Softwood** ||
 * || Ash || MDF || Pine ||
 * || Beech || Ply Wood ||  ||
 * || Mahogany || Hardboard ||  ||
 * || Teak || Chipboard ||  ||
 * || Oak ||  ||   ||

Hardwood: =Ash: Ash is a strong wood to work with. Its workability is fair meaning it is not the easiest to work with but not the hardest. The finishing qualities are good and the durability is also good.=

=Beech:Hard, heavy, strong, stiff and shock resistant. Poor dimensional stability and decay resistance. Its works with machines well but can be difficult to work by hand. Tends to split -pre-drilling recommended for screws and nails. Finishes and steam-bends well.=

=Mahogany: Variable, but generally moderate weight, hardness, and strength. Low stiffness and shock resistance. Very good stability and decay resistance. Moderate steam bending rating.=

=Teak: Moderately hard and heavy, with low stiffness and shock resistance, moderate bending strength, moderate steam bending, and excellent decay resistance and dimensional stability. Good acid resistance. Works reasonably well with hand or machine tools but properties in wood is tough on cutting edges and machine dust can be an irritant to users. Good turning and carving properties. Stains and finishes well.=

=Oak: Heavy, hard and strong with outstanding wear-resistance. Moderate stability in use. Steam-bends very well. Very durable. When used on machines Oak has a great tendency to chip and splinter. Turns well. Difficult to work by hand. Nails and screws satisfactorily although pre-drilling is usually recommended to prevent a risk of damage. Glues satisfactorily. Stains and finishes well with smoothness. Contact with metal results in dark staining.=

=Evaluation Of Hardwoods:= =1.Oak: Heavy, Hard and strong, fantastic resistance Medium Quality= =2.Teak: Can be finished well, works reasonably well hand made or with machines, Medium- High Quality= =3.Beech: Works well with machines but difficult to hand work the material, produces a good finish Medium Quality= =4.Ash: finishing Qualities are good and the material is strong. Medium Quality= =5. Mahogany: expensive, high strength , good decay resistance , good for outdoors? High Quality=

Manufactured Woods

=MDF:dense, flat, stiff, has no knots and is easily machined. MDF can be painted to produce a smooth quality surface. Due to the fact that MDF has no grain it can be cut, drilled, machined and filed without damaging the surface. MDF may be glued together with PVA.=

=Plywood: Plywood is flexible, cheap, workable, recyclable, and can usually be locally manufactured.=

=Hardboard: easy to work with, the surface is not easily damaged, cheaper than solid wood products. Hardboard has high Malleability,Ductility, plasticity.= =Hardboard has poor moisture resisting properties and is not suitable for outdoor use.=

=Chipboard: is often used for kitchen tops and fire doors. It has Medium density. Usually used for indoor use but grades are available for exterior use.All grades of chipboard except the high-density variety tend to soak up water. Once it is water logged, chipboard tends to swell and breakdown. Chipboard can be finished well and often has a high durability.=

=Evaluation of Manufactured woods= =1.Plywood: Low environmental impact, Flexible, Workable. High Quality= =2.Hardboard: Easily Worked, cheap, the shape can be easily changed without damage Medium Quality= =3.Chipboard: Finished Well and High Durability Medium Quality.= =4.MDF: Can be worked in a variety of ways Low Quality=

Softwood =Pine: Light, soft, moderately stiff, low strength and shock resistance, moderately low decay resistance, and good stability.=

=Evaluation of pine: Not the right material for making a chair because it is weak low resistance and decays easily.=

=Types of metals that could be used?= i researched into the metals that could be used to construct my novelty chair. After looking at all the properties of the metals ferrous and non ferrous i decided that they had some properties that would and would not benefit my design. I have decided to avoid using metals and complication because metals do have properties that are unneeded in my design such as electrical conductivity. I feel that would is the best option because it is better an easier to work with than most metals due to woods malleability, ductility, plasticity and durability. By using wood i am keeping my options open because there are a lot of quality woods that finish well that i have the option to work with, each different wood has different properties that could be useful at any given point.

=Composites?= =Carbon Fibre: is a composite that is very light, yet very strong and durable.= Glass reinforced plastics: although this enforces the strength and most probably the durability of my product, i do not see it as a necessary factor due to the fact that it is a design for small children , therefore it does has to be reinforced but not to this level. I feel if i use glass reinforced plastics it would complicate the design.

=Plastics that could be used to construct my novelty seating unit for use in children's nurseries?=
 * **Thermoplastics** || **Thermosets** ||
 * Acrylic || Polyester Resin ||
 * HDPE ||  ||
 * PVC ||  ||
 * LDPE ||  ||

=Acrylic: Is a strange material because it can stay hard when at room temperature, but when put into high heats is pliable and can be bend and easily damaged. The main problem with the material is that it is brittle therefore the surface can easily be damaged, when damaged it is easily visible and can ruin the design.=

=HDPE: Can withstand high temperatures (high melting point), High Strength, Density and bending strength.=

=PVC: Can Survive a variety of weather conditions, Versatility meaning the material can be flexible or rigid, High Durability meaning it would last a long time and would be worth the money, Recyclable meaning the product can be reused and does not contribute to global warming.=

=LDPE: Reasonably high Melting point, High Flexibility, High in strength not as strong as HDPE, Low Durability.=

=Polyester Resin: Resistant to Water and Ultraviolet radiation. Is a Brittle material meaning it is damaged easily and the damage caused can completely ruin the design.=

= = =Evaluation of Plastics= =1.PVC: resistant to all weather conditions, high durability, recyclable= =2.HDPE: High Strength, density and bending strength= =3.LDPE: Good Flexibility= =4.Acrylic: Easily Damaged, Damaged easily Visable= =5.Polyester: very brittle design can easily be damaged.=

Some Pictures that show novelty seating