Rotational Moulding Research Report

Manufacturing of plastic water tanks

Imesha Malshan

1532550

Abstract

This report will discuss about the manufacturing process of plastic water storage tanks using rotational moulding method. This contains about the main steps used in rotational moulding to produce plastic water storage tanks. The report will briefly explain about the machineries used for this process. And the report will discuss about the materials used and their quality. The quality considerations and possible defects will be also discussed in this report.

Contents

1. Introduction 3

2. Materials used 4

3. Tools required 4

4. Manufacturing process 5

4.1. Preparation of the production material. 5

4.2. Heating the mould 8

4.3. Cooling down the mould 9

4.4. Removal of the product from rotational moulding machine 9

5. Checking the quality of the water tank 11

6. References 12

1. Introduction

Plastic water storage tanks are widely used in the world today.

Cooling down the mould.

4. Removal of the product from rotational moulding machine

4.1. Preparation of the production material.

As noted before Linear low density polyethylene (LLDPE) is used for water storage tank manufacturing. The Linear low density polyethylene used for this process is a food grade material. We cannot use raw Linear low density polyethylene for this manufacturing process. This material should be processed withstand various conditions such as sharp sunlight. This Polyethylene material should not react or mix with water while using the tank for storing water. This Linear low density polyethylene should be processed with various chemical additives to meet the previously listed requirements. Figure 1: Normal linear low density polyethylene

Above picture show how the normal linear low density polyethylene looks like. These LLDPE particles should be grinded into powder and bigger particles should be removed. For this process, we use the pulverizing