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BLISTER PACKS POLYPROPYLENE IS BEST

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One advantage that PP monobiisters have compared with aluminium/PVC types is that they do not curve during late-stage production, making it easier to sbt them into cartons or other packets. This is because they are made of a single material, and do not suffer from differential expansion between the aluminium and PVC. The thermoforming and sealing films each have advantages compared with aluminium and PVC.

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BListeR paCks
poLypRopyLene is Best
Peter Forsmark, Technical Director, Recipharm (stockholm, sweden) explains why polypropylene
blister packs are better than aluminium and PvC blisters now that the technical barriers to
manufacturing them have been overcome.

               lister packs made entirely of
               PP (polypropylene) have many
               advantages compared with
               aluminium and PVC blisters,
the most common type on the market.
Among these advantages are lower weight
and production costs, higher performance
and less environmental impact throughout
the production process. Polypropylene
monoblisters typically consist of two plastic
films with different properties, such as Etimex
Purelay Pharm and Purelay Lid films (Figure 1).
The ‘Pharm’ film is a PP thermoforming film that
is similar to the PVC or PvdC (polyvinylidene
chloride)-coated PVC films used in an
aluminium/PVC blister, whereas the PP push-            Figure 1: Monoblister formation, comparing Al/PVC with PP blister packs.
through lidding film seals the blister and serves
the same purpose as the aluminium. Examples
of when PP monoblisters have replaced PVC/
                                                       PP MOnOBLIsTeRs DO nOT CuRve DuRIng LATe-
aluminium blisters are Reliv and Alvedon, two
paracetamol products widely used in Sweden.            sTAge              PRODuCTIOn,                        MAkIng               IT       eAsIeR            TO
    One advantage that PP monoblisters have
compared with aluminium/PVC types is that              sLOT         THeM           InTO          CARTOns                 OR       OTHeR          PACkeTs.
they do not curve during late-stage production,
making it easier to slot them into cartons or other        PP thermoforming films are also better than           in 1995, Recipharm (then Recip) has been
packets. This is because they are made of a            PVC in other respects. They are less dense,               strongly committed to being an environmental
single material, and do not suffer from differential   lighter and more transparent, and the stiffness           trendsetter in the pharmaceutical industry.
expansion between the aluminium and PVC.               of PP is better suited to pushing tablets from            Recip was one of the first pharmaceutical
The thermoforming and sealing films each have          the packaging. In addition, PP thermoforming              companies to be certified according to
advantages compared with aluminium and PVC.            films produced by heating and quenching the               ISO 14001 in 1997 and, in 2001, Recipharm
PP thermoforming films are more cost-effective         polypropylene have excellent thermoforming                undertook a product lifecycle analysis to assess
than PVC films coated with PVdC sealant wrap           behaviour and barrier properties. The PP             
								
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