BAHAN DAN TEKNOLOGI PEMBUATAN (INDUSTRIAL DESIGN)

SCP 1052 Materials & Manufacturing

Technology

• NORFARHANA AISYAH BINTI NORZELAN C14A0503

• SITI NABILAH BINTI AHMAD YUSRY C14A0910

Introduction

Plastic

Any of wide range of syhthetic or semi-synthetic organics solids that are malleable

Organic polymer of high molecular mass – contain another substances

Synthetic, most commanly derived from petrochemicals

Used in an enormous and expanding range of product

Etymology : - Derive from Greek ‘plastikos’ means

capable of being shaped or molded. Contain organic polymers.

Plastic Classes

Thermoplastics Elastomer Structual

Electrically Conductive Biodegradable Thermoset

Thermoplastics

Thermosoftening plastics is a plastic material Typically a polymer High molecular weight May be reshaped by heating

Product Selection & Usage

Product Selection

Detergent Bottle

High-density polythylene (HDPE) And Usage

Also known as Polythylene High Density (PHDE)

Polythylene Thermoplastics Made from petroleum Can be recycled Used in production of a plastic

bottles,corrosion-resistant piping,geomembranes and plastic lumber

Material Properties

Material Properties

Density

Length

Melting Point

Physical

Dimension

Transparency

Density

Volumetric mass density Mass per unit volume Quantity specifically called specific weight Density of material varies with temperature

and pressure. Density(D) / Range from 0.93 to 0.97g/cm³ or 970Kg/m³

Length

Geometric measurement Longest dimension of an project SI units : metre (m)

Melting Point

Temperature at which a solid turns to liquid

HDPE : (i) temperature : 120 c ( for short period) , 110 c (continiously)

Dimension

Min no of coordinates Have a line has a dimension of one because

only one coordinate is needed to specify a point

Mechanical Properties

Modulus Young

Elasticity

Hardness

Modulus Young Tensile or elastic modulus Measure of the stiffness of an elastic

material and is a quantity used to characterize materials.

Most common elastic modulus Tensile Strength MPa (psi) : 17.3 -44.8

(2500-6500) Tensile Modulus MPa (10³ psi) : 620 - 1089

Elasticity Tendency of solid materials to return to their

original shape after being deformed Solid objects will deform when forces are

applied on them If material is a elastic, object will return to

initial shape when these forces are removed.

Hardness

Measure of how to resistant solid matter is to various kinds of permanent shape change when comprehensive force is applied

Depends on ductility, elastic stiffness, plasticity, strain, stress, toughness, viscoelasticity and viscocity.

Different between HDPE & LDPE

HDPE is flexible and more rigid from LDPE.

HDPE is semi-translucent depending on density while LDPE is translucent with high impact strength.

Manufacturing Process

Polymerization process

Drying Extrusion Molding

Hydrocarbon solvent

to purification and recycle

polymer

Filtration

Conclusion HDPE is thermoplastic HDPE made from petroleum HDPE is marginally high than LDPE HDPE can be recycle HDPE is used awide industry