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Semirigid Packaging Materials

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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