PET spray applicator protects medical products

  • PET as primary packaging in medical applications
  • PET container & six injection-moulded parts made of PP or POM
  • Phillips-Medisize showcases device at Pharmapack

Primary packaging plays an important role to protect medical products, irrespective of their physical form, while at the same time remaining user-friendly. The company Phillips-Medisize has put design and production expertise into practice and will showcase a very special spray applicator at the upcoming Pharmapack exhibition in Paris, France.

The development of the spray applicator

The customer’s design requirements demanded that the product was child-proof, an important factor for the product launch, particularly on the US market, and a container made of PET, considered to be a harmless type of plastic. All of its components are produced and assembled under the necessary conditions of hygiene in the plant in Nürensdorf, Switzerland. Small metal springs for the spray mechanism and the pumps are purchased. The chosen manufacturing process consists of injection moulding and injection stretch blow techniques. With the latter, the nozzle section of the bottle is formed in the first step, and then the lower part is blow-moulded separately. This ensures proper sealing.

Injection-stretch-blown PET container combined with six injection-moulded parts made of PP or POM

Precise processing and proper sealing of the sprayer are also very important to ensure that the product is child-proof. The spray applicator is made of seven parts: the injection-stretch-blown PET container and the six injection-moulded parts made of PP or POM. The differently shaped parts require using multi-cavity tools of various sizes on injection moulding machines with clamping forces of 50 to 200 tonnes.

Spray applicator

The spray applicator of Phillips Medisize combines a PET container with parts made from PP and POM (source: Phillips Medisize)

Precision parts with tolerances not exceeding 0.03 mm

Extensive validation procedures were carried out prior to the production launch: from DQ (Design Qualification), to IQ (Installation Qualification), on to OQ (Operation Qualification) and PQ (Production Qualification). In the assembly process, the parts pass through 16 assembly stations before the so-called “subcomponent” is completed. The validation procedures also have the added ergonomics advantage that the amount of non-recyclable materials, that have to be discarded during production, is extremely low considering the fact that the various plastic parts have to intermesh precisely and that each part has different tolerances that must not exceed 0.03 millimetres at most.

The company will also display a range of other products at the Pharmapack: special drug delivery devices, dosage systems, disposable insulin pens, inhalers, mixing injectors, bottles and caps, and sterile multi-chamber bags.


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