Page 30 - FMT Magazine, September 2020

Packaging

Adhesive

Packaging

By Dr. Parul Thapar* and Riya**

INTRODUCTION
Adhesives are non-metallic
substances that are capable of
joining materials by surface bonding
(adhesion), with a bond possessing
adequate internal strength (cohesion).
Adhesion is the force of attraction
between molecules in different
layers.1 There are different types of
adhesive materials depending on
their characteristics and functions
which are shown in Table 11-10:

S.No. Types of adhesives Characteristics Applications
1. Bio-based adhesives Derived from renewable resources Used for wood composites, for
like lignin, starch and plant protein. manufacture of products like plywood
They have high mechanical strength, and softwood.
excellent thermal stability and low
initial viscocity.
2. Ocular adhesives These are easy to use. They can Substitutes for sutures in operational
potentially minimize post-operative surgery.
complications.

3. Cyanoacrylate Efficient with ease of application; Used in medicine and dentistry for
adhesives feasible; adhesive strength; oral wounds and surgical procedures.
biocompatibility; polymerization in
moist environment.
4. Epoxy adhesives Resistant to high heat and chemicals; Automobile industries
high cohesion; elasticity and minimal
shrinkage
5. Emulsion/ Dispersion High molecular weight, low viscous and Used in paper packaging and food
based adhesives good workability packaging
6. Polyurethane High flexible and bonding strength Food packaging

adhesives
7. Water based Contain starch- dextrin or casein Food packaging
adhesives

Food Marketing & Technology 30 September 2020