Overview
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Read the articleAUTHOR
-
Pierre CHOMON: Co-founder of Soplaril - Conference and training officer
INTRODUCTION
The various polymers used in packaging must fulfil three main functions:
presentation ;
conservation ;
machinability.
This is why, in many cases, several are combined either – by complexing, extrusion-lamination, extrusion-coating, tandem extrusion and increasingly by coextrusion (see "Plastic packaging. Converting processes and applications"
The presentation is designed to appeal to the potential buyer, through graphics and colors, and quickly synthesizes the segment in which the customer traditionally shops (festive product, promotional launch or batch).
Shelf-life ranges from a few days to 24 months, with or without a cold chain, which implies different levels of barrier (O
2
, H
2
O, UV) (see "Barrier properties of polymers used in packaging"
Machinability is the material's suitability for use on one of the available technologies: prefabricated bags, vertical machine, horizontal machine, thermoforming machine, tray and pot sealing machine, folding machine (see "Packaging machinery. Dry products and small items"
The R&D team must respond to all these constraints in order to satisfy the specifications provided by the marketing department. Knowledge of the properties of polymers and the possibilities of their processing guides the team in its choice.
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Bibliography
In Engineering Techniques
Standards
- Emballage. Exigences relatives aux emballages valorisables par compostage et biodégradation. Programme d'essai et critères d'évaluation de l'acceptation finale des emballages - NF EN 13432 - 11-00
- Plastiques. Symboles et termes abrégés. Partie 1 : polymères de base et leurs caractéristiques spéciales - NF EN ISO 1043-1 - 3-02
- Plastiques. Film et feuille. Détermination de l'épaisseur moyenne d'un échantillon, et de...
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