Polypropylene packaging material

Selecting an approach Off-flavors are typically due to volatile compounds present at extremely low levels. (Flavor is sensed more by the olfactory system than the tongue, which senses only 5 flavors, sweet, sour, bitter, salty, and umami). GC is ideal for detecting low levels of volatile components. In this case, headspace GC will allow you to treat the plastic directly. Since the off-flavor is suspected to be derived from the polypropylene packaging material, you decide to compare different samples ( good vs. bad ) of the material using headspace GC with both a flame ionization detector (FID) and a sniff port. These chromatograms are shown in Fig. 21.9. 

Interpretation I report Ethyl isopropyl sulfide is the off-flavor compound and its source is the polypropylene packaging material. 

Polypropylene fibers for use in car pets and automobile tires consum er Items (luggage appliances etc) packaging material... 

Because of poor therm oform ability, there are relatively few apphcations for polypropylene sheet. New soHd-phase pressure forming (SPPE) techniques are under development for forming PP sheet. Polypropylene is used in coextmded sheet to some extent for food packaging containers. Glass-filled, wood-filled, or other modified polypropylene sheet materials are used in limited automotive apphcations. 

A small quantity of flexible packaging material, usually oriented polypropylene, shrink polypropylene, or polyethylene, is used to overwrap paperboard cartons. The film is wrapped around the carton and sealed by heating. Products such as boxed chocolates, candies, and cookies are overwrapped, sometimes by a printed film. 

Polypropylene is used in battery cases and in the replacement of metal parts in automobiles. It is also widely used in consumer products, eg, kitchen wares, trays, toys, and packaging materials. Its future appHcations are expected to include an increased portion of the fibers and filaments markets, especially for continued growth in carpet backing and carpet face yams. Film, both oriented and unoriented, is also expected to be a significant growth market for polypropylene. 

Polypropylene fibers for use in carpets and automobile tires consumer items (luggage, appliances, etc.) packaging material. 

Packaging materials which have a smooth, impervious surface, free fi cm crevices or interstices, such as cellulose acetate, polyethylene, polypropylene, poly vinylchloride, and metal foils and laminates, all have a low surface microbial count. Cardboard and paperboard, unless treated, carry mould spores of Cladosporium spp., Aspergillus spp. md Penicillium spp. and bacteria such 2 Bacillus spp. sn.dMicrococcus spp. 

On the other hand, the type of the packaging material did not exert any effect on tire residue levels at a storage temperature of 20 C. At 4 C, nitrofuran residues remained stable when the egg samples were stored in glass or polypropylene tubes, but a loss of 60-70% was observed when a laminated foil was used. At 20 C, all four nitrofurans exhibited marked residue reduction, the losses being 30-50% for glass tubes, 40-60% for polypropylene tubes, and 100% for laminated foil. 

This class of materials includes the family of plastics based on ethylene and propylene (Robertson, 2006). Low, linear, and high density PE and polypropylene (PP) materials are common food packaging materials. The use of polyolefins, such as PE and PE terephthalate (PETE) in contact with foods and beverages is common. However, contact with foods, especially under conditions of heat or long duration, can potentially impact sensory characteristics of the contained product. Packaging should be carefully selected, especially for applications that involve heat treatment at high temperatures while in contact with foods. 

Feigenbaum, A., Lebosse, R., and Ducruet, V. (1998). Polypropylene as active packaging material for aroma sorption from model organge juice. In Food Flavors Formation, Analysis and Packaging Influences" (E. T. Contis, C.-T. Flo, C. J. Mussinan, T. FF. Parliment, F. Shahidi, and A. M. Spanier, eds.), pp. 743-751. Elsevier Science BV, Amsterdam. 

An LVP may be packaged in a vial, a flexible bag, or, in some cases, a disposable syringe. Packaging material for cartridges, syringes, vials, and ampules are usually composed of polypropylene (Table 2). 

Thus far, we have considered addition polymerization routes - either catalyzed or uncatalyzed. Although this is sufficient to describe the synthesis of common packaging materials such as polyethylene, polypropylene, polystyrene, etc., other classes of polymers such as nylon, PETE, and polyacrylamide are generated through step-growth mechanisms. Although the synthetic pathway for these polymers is more straightforward than addition polymerization, there are many intricate considerations that affect overall polymer properties. 

ILSl Europe Report Series Packaging Materials 1. Polyethylene terephthalate (PET) for food packaging applications 2. Polystyrene for food packaging applications 3. Polypropylene for food packaging applications 4. Polyethylene for food packaging applications 5. Polyvinyl chloride (PVC) for food packaging applications. 

The majority of packaging plastic materials consists of polyolefins and vinyl polymers, namely polyethylene (PE), polypropylene (PP), polystyrene (PS) and poly(vinyl chloride) (PVC). Obviously, these polymers have many other applications not only as packaging materials. Chemically they are all composed of saturated hydrocarbon chains of macro-molecular size their typical thermal decomposition pathway is free radical one initiated by the homolytic scission of a backbone carbon-carbon bond. In spite of the basic similarity of the initial cleavage, the decomposition of the hydrocarbon macroradicals is strongly influenced by fhe nafure of the side groups of the main chain. 

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