The semi rigid packaging materials are those materials which are
neither rigid nor flexible in nature. The important packaging materials under
this category are discussed below:
i)
Folding Carton
The folding cartons are primarily made from duplex board or triplex
board. The duplex board of having grammage ranging from 220 gsm to 300 gsm are
used to convert into folding carton by means of different steps like creasing,
scoring, slotting and finally gluing.
PROPERTIES
OF FOLDING CARTON
Amenable to more number of colour printing, Ease of handling,
distribution and storage at retail outlet under refrigeration, Amenable to make
pilfer proof closing device, Stiffness nature of folding carton facilitates to
stack the product easily,Empty cartons provide excellent space utilization due
to collapsing in nature.
APPLICATION
OF FOLDING CARTON
Mainly used as intermediate pack for the Butter, sweets like
Sohan papri, and milk burfi.
ii)
Lined Carton
The term indicates that this package is made of paper board and
then lined internally with appropriate packaging materials.
PROPERTIES
OF LINED CARTON
- Very economical as compared to metal containers.
- Provides excellent shelf life due to excellent barrier properties against moisture,gas, light of the internal liner material.
- Easy to stack at the outlet due to rectangle in shape.
- Could be made available at different capacity ranging from 100 ml, 200 ml, 1 kg, 2 kg.
- Suitable to pack solid, semi solid as well as liquid product.
- Amenable to print on the outer surface.
- Easy open device in the form of knotch or spout facilitate.
- Tailor made lined cartons.
APPLICATION
OF LINED CARTONS
Packaging of ghee, khoa, Skimmed milk powder under vacuum
condition and Malted milk food.
iii)
Aseptic Carton
In this system, both the package and the product are sterilized
separately and then the packaging operation is carried out under aseptic
(sterile) conditions. This system offers a long storage life for about three
months with out any preservatives or refrigeration. The carton is formed by
using three important materials like
(a) Paper board (about 80%) : Provides mainly the rigidity and
stiffness.
(b) Polyethylene (about 15%) : Contribute to have heat seal and
also provide barrier to microorganisms.
(c) Aluminium foil (about 5%) : Mainly responsible to provide
barriers against air, light and off flavour.
Combining each of these three materials has enabled carton to
produce a packaging material with optimal properties and excellent performance
characteristics.
PROPERTIES
OF ASEPTIC CARTONS
Higher degree of safety, hygiene and nutrient, retention,
Preserving taste and freshness, can be kept for months, efficient device to
achieve this function by using minimum quantity of material, a good example of
resources efficiency and lightest packaging material.
iv)
Thermoformed Containers
The containers or packages are made by means of thermoforming
techniques.The containers could be made in the form of tub or plastic cups. The
containers are closed by means of plastic lid made of either polyethylene (PE)
or polypropylene (PP).
PROPERTIES
OF THERMOFORMED CONTAINERS
Amenable to screen printing on the surface, Provides high
barrier against moisture, gas and light, Lighter in weight as compared to other
packaging material, Resistance to low temperature and thus suitable to
refrigeration, suitable to make toiler made design based on the mould, could be
amenable to make coloured containers and easy to handle and are hygienic.
APPLICATIONS
Packaging of butter, ice cream, Dahi, Shrikhand, etc., yogurts,
concentrated products like Kheer, Payasam, Rabri, Kaalakand, gulub jamun,
pedha, Rasgolla,sandesh, Ras malai etc. and burfi.
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