New siliconization process for optimal quality

Primary packaging manufacturer quadruples output of siliconized glass vials with Bosch line


The siliconization of glass for medical products is a proven method. A thin layer of silicone is applied to the inner surface of the glass container, which has two key advantages: firstly, thanks to its hydrophobic qualities, the silicone serves as an effective barrier between the glass and the contents, preventing the delicate filling goods from adhering to the glass. Secondly, the water-repellant silicone layer ensures that the glass container can be emptied without any residues, which can be especially important for specific pharmaceuticals. Yet the siliconization of vials is particularly challenging: unlike syringes or cartridges, where the silicone is merely applied at selected points as a lubricating layer, the entire inner surface of vials must be uniformly siliconized.


Based in Holzminden, Lower Saxony, Müller + Müller-Joh. GmbH & Co. KG has been using its proven siliconization method in tubular-glass vials for decades. Looking back on a tradition spanning more than 90 years, the family-run company produces 300 million premium vials for the pharmaceuticals, biotech, chemical and diagnostics industry every year, designed to satisfy the most stringent quality criteria. The company offers inner-surface siliconization for numerous tubular glass vials with different neck finishes such as injection or screw neck.


Surface treatment for vials is trending

For some time now, the company has observed a growing demand for special glass treatments. “When it comes to inner surface siliconization of tubular glass vials, the demand is steadily rising,” confirms Florian Müller-Stauch, CEO of Müller + Müller. When a customer approached Müller + Müller with a major order for siliconized vials, the glass specialist recognized the need to expand its capacity by adding a new complete siliconization line integrated in a cleanroom, as well as a warehouse for packaging material.



A project with challenging requirements

To implement the project, Müller + Müller has chosen to collaborate with Bosch Packaging Technology. “We were familiar with Bosch’s good reputation, but hadn’t ever worked together,” says Müller-Stauch. “In a very short time, the Bosch team provided us with a tailor-made concept – in exactly the quality and speed we had been looking for.” The demands on the plant manufacturer were high: just one year after start of production, the siliconization line, for which Müller + Müller build a new hall, was to go into operation.


Just a few months later, the construction of the new production hall with a cleanroom, water treatment system, and a packaging and pallet warehouse was completed. Right on time for the project end, the siliconization line was ready to go into operation. It consists of an RRU cleaning machine for vials and an HQL drying tunnel, covering all stages from production to tray loading.


Four times the output

Thanks to the new process, the silicone application can now be calibrated far more precisely, and can be adapted to various formats, such as round-bodied or cylindrical vials. “The new siliconization system has more than quadrupled our output rate,” explains Müller-Stauch. “Choosing a partner with substantial experience in siliconization definitely paid off for us. The high precision of the Bosch system, together with a thoughtful quality policy, will allow us to offer our customers an optimal siliconization in the future.”



Sebastian Lauterbach
Sales Manager Pharma Liquid
+49 7951 402-268

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