OVERVIEW OF PLASTIC BOTTLES

PREPARED BY

KAVAR GAURAV

DDU, NADIAD(GUJARAT)

INTRODUCTION

A plastic material is any of a wide range of synthetic or semi-

synthetic organic solids that are moldable.

Plastics are typically organic polymers of high molecular mass

but they often contain other substances.

They are usually synthetic, most commonly derived from

petrochemicals , but many are partially natural.

Raw- materials

Most plastic water bottles are made from polyethylene

terephthalate (PET).

Pet bottles are replacing glass bottles because of the high rate of

breakage and the inconvenience of returning the empty bottle

after consumption.

Polymer derived from oil that adds flexibility, color, and strength

to plastic.

It is impermeable to carbonation. It is strong, light, impact

resistant, naturally transparent, and completely recyclable.

Raw- materials

Some other raw -materials are polyethylene, High-density

polyethylene(HDPE).

Some plastic bottles contain small amount of Bisphenol A (BPA).

Synthesis route (PET)

An “ester” is the reaction product of an organic acid and an organic

base.

PET formed by reacting ethylene glycol (base) and terephthalic acid

Condensation polymerization reaction

Largest use in injection blow molded

Manufacturing process & Technology

For making a plastic bottles Blow molding mostly use.

Blow molding is a manufacturing process by which hollow

plastic bottles are formed.

In general, there are three main types of blow molding: extrusion

blow molding, injection blow molding, and injection stretch blow

molding.

Manufacturing process & Technology

The blow molding process begins with melting down the plastic

and forming. Blow molding is a manufacturing process by which

hollow plastic parts(bottles) are formed.

A section of molten polymer tubing is extruded into an open

mold.

By means of compressed air or steam the plastic is then blown

into the configuration of the mold.

Manufacturing process & Technology

Injection blow molding is generally suitable for smaller

containers and absolutely no handles ware.

Injection blow molding is often used for containers that have

close tolerance threaded necks, wide mouth openings,and highly

styled shapes.

The air is injected into the plastic at a rate between 75 to 150 PSI.

Manufacturing process & Technology

Injection molding can be broken down into three stages.

The first stage is where the melted plastic is injected into a split steel

mold cavity from the screw extruder.

The mold produces a preform parison which resembles a test tube

with a screw finish on the top.

The preform is then transferred on a core rod to the second part of the

injection blow molding stage. The preform is then placed inside

another cold and usually aluminum blow mold cavity.

Manufacturing process & Technology

Air is then injected through the core rod till the preform takes the

shape of the cavity.

While still on the core rod, the container is then transferred to a

desired location for the third stage, where it is ejected from the

machine.

Manufacturing process & Technology

properties

plastic bottles can take a beating. Versatile and durable.

It can be recycle and reuse.

Easily disposable.

Thermoplastic in nature.

Various plastic bottles

Carbonated drinks bottles are made from Polyethylene

terephthalate(PET).

Detergent bottles are made from High-density

polyethylene(HDPE).

Bottle caps are made from Polypropylene(PP).

During process various types of ingrediants like Fillers

Plasticizers, Colorants should be added.

Applications

packing of Edible oils

packing of jams and sauces

packing of Butter, syrups and Drinking water having capacity

from 500ml to 2 lit.

Major applications

Carbonated soft drinks.

Mineral water packing.

Agro chemical packaging.

House hold containers.

Recycling process

This process divided into four stages.

1. plastic bottles puts into the appropriate recycling container or

local recycling point.

2. The plastic is then taken to a sorting facility where it is baled

and taken to a processing facility.

3. At the processing facility infra-red technology is used to sort

the mixed bottles into their separate types

4. The bottles are then shredded into either plastic flakes (PET) or

granules (HDPE)

5. Flakes and granules are then melted and processed with various

techniques and returned to the manufacturers of plastic bottles.

Symbol for plastic bottles

PET (PETE) PP

HDPE PS

PVC OTHER

LDPE