The single rotor design of the SPS and MR series pumps offers very low propulsion, while large pumping chambers help preserve and maintain product integrity.
The single rotor design of the SPS and MR series pumps offers very low propulsion, while large pumping chambers help preserve and maintain product integrity.

Aeropak (Chemical Products) Ltd, a wholly owned subsidiary of Diomed Developments handling various chemicals, is using three MasoSine sanitary pumps from Watson-Marlow Pumps Group to ensure the efficient and effective mixing of mainly aqueous and oil-based off-the-counter (OTC) and prescription medicine such as moisturising creams, and other dermatological products.

“The pumps are used primarily to help re-circulate bulk product in mixing vessels through homogenisers – an essential process to ensure the quality of the products,” says Graham Abraham, Projects Manager at Aeropak.

Bulk storage

The MasoSine pumps are also used to transfer product from the mixing vessels into bulk storage containers. Abraham says it is the gentle, low shear product handling capability of the pumps that underpinned their original selection. This feature is achieved thanks to the exclusive sinusoidal rotor integral to both SPS and MR series models, which gives a wave-like action. The single rotor design offers low propulsion, while large pumping chambers help preserve and maintain product integrity.

Some products manufactured by Aeropak, such as the emollient gels, exhibit high viscosity, which act both as a moisturiser and as a protective hydrating gel. These gels look and feel like a combination of cream and gel; it is thick-shear sensitive and effective mixing is critical to its performance.

“The viscosity of products such as emollient gels is not a problem for the MasoSine pumps,” says Abraham. “They work away without any issues. Because of their simple design (one rotor, one shaft, one seal), economical in-line maintenance and cleaning is also achieved easily. When we need to change product on one of the production lines, stripping the pumps, cleaning them down, testing and re-assembly is both quick and straightforward. Obviously the need to get the production lines changed over in an efficient manner is critical to our operations here at our manufacturing site in Great Yarmouth.”

Adaptable operation

The key word towards successful manufacture is flexibility. As an adaptable operation, the Great Yarmouth plant is currently suited to the manufacture of various volume packs of liquids, creams and gels. Among the gel-based products is leading brand verruca treatment. Products such as these inherently carry volatile and sometimes flammable ingredients, which need to be handled professionally. Aeropak has a long history of experience in this area – as its name might suggest, the company's origins lie in the packaging of model aircraft fuel.

To improve the handling of a number of its other products, Aeropak is currently considering the adoption of peristaltic pump technology from Watson-Marlow. Project discussions are currently in progress.

State-of-the-art manufacturing
Aeropak's growth in output is primarily due to its acquisition by the Diomed Group in 1998. Following a period of consolidation, the past five years have seen Diomed secure its long term strategic supply of products from Aeropak. Investment has been significant at Great Yarmouth where, in 2002, Aeropak moved to a new, specially commissioned, state-of-the-art manufacturing site that today is the workplace of 40 employees. This large, modern factory provides substantially improved facilities to manufacture a much greater quantity and variety of pharmaceutical products to best practice standards. Since moving to the new site, Aeropak has installed three new MasoSine pumps from Watson-Marlow: SPS2, SPS2.5 and MR130 models.