German Pharmaceutical Packaging Factory Case Study: Cooling System Upgrade Achieves Zero Defect Batches with ZILLION Water-Cooled Chiller
Pharmaceutical plastic components are among the most tightly regulated products in manufacturing. Prefilled syringes, medication bottles, IV containers, blister pack trays, and diagnostic test housings must meet exacting standards for dimensional accuracy, surface integrity, and material purity. Any deviation in the injection molding process — including a 2-3 degree variation in mold temperature — can cause defects that render an entire batch non-compliant with pharmacopeial standards.
This case study documents how a German pharmaceutical packaging manufacturer resolved a recurring defect problem in prefilled syringe body molding by replacing their aging air-cooled chiller with a ZILLION ZL-15WS water-cooled industrial chiller integrated with a closed-loop cooling tower system. Over 18 months of operation, the plant achieved zero defect batches due to cooling variability, reduced scrap rate from 8.3% to 1.1%, and increased line output by 22% due to eliminated cooling-related shutdowns.
The customer operates a pharmaceutical contract manufacturing facility in Bavaria, Germany, producing approximately 45 million prefilled syringe bodies per year for three major pharmaceutical companies. Their injection molding cell consisted of a 280-ton injection press molding cyclic olefin copolymer (COC) syringe bodies at a cycle time of 8.5 seconds.
The facility had used a 12-year-old 12 kW air-cooled chiller to supply cooling to the mold's temperature control unit (MTC). While the chiller was nominally adequate for the application's cooling requirements, the plant experienced three recurring quality problems:
The COC material used for pharmaceutical syringes has a narrow processing window. The required mold surface temperature is 38-42 degC with a tolerance of plus/minus 1 degC. The aging air-cooled chiller showed evaporator temperature swings of up to 4 degC over the course of a production shift — particularly during summer months when ambient temperatures in the plant room exceeded 32 degC.
The dimensional consequence: syringe bodies molded during afternoon shifts showed wall thickness variation of up to 0.08 mm, compared to the 0.02 mm specification. This caused intermittent failures at the client's fill-finish quality control stations, resulting in batch rejections and costly documentation cycles under EU GMP requirements.
The air-cooled condenser's coil fins accumulated dust, pollen, and moisture over the production season. Despite quarterly cleaning schedules, the condenser became a site for microbial growth including Pseudomonas species — a serious concern in pharmaceutical environments. Routine environmental monitoring detected elevated airborne bacteria counts in the molding area during summer months, triggering corrective action reports (CARs) and additional environmental validation testing costing approximately EUR 18,000 per event.
The chiller's scroll compressor showed increasing run time differential between compressors (in a dual-compressor configuration) over the final 18 months of service life. This indicated refrigerant-side issues — most likely leakage and unequal charge distribution — causing one compressor to carry disproportionate load. The compressor failed catastrophically in August, causing a 72-hour unplanned production stop at a cost estimated at EUR 120,000 in lost output and expedited repair costs.
Following an engineering review, ZILLION's European technical partner specified a ZL-15WS water-cooled industrial chiller paired with a ZILLION ZCT-25 counterflow cooling tower in a closed-loop condenser water configuration. Key design parameters:
| Parameter | Specification | Reason |
|---|---|---|
| Chiller cooling capacity | 15 kW at 20 degC leaving water | Matches process heat load + 20% margin |
| Condenser water flow rate | 4.2 m3/hr at 32 degC / 37 degC | ZILLION ZCT-25 tower matched to 39 kW heat rejection |
| Condenser water temperature | 32 degC entering / 37 degC leaving | Allows stable evaporating temperature across seasons |
| Water treatment | Automatic conductivity blowdown + biocide dosing | Maintains condenser water quality per VDI 3803 standards |
| Redundancy | Dual pump configuration (duty/standby) | No single point of failure in critical pharma production |
The installation was completed over a 5-day shutdown period to minimize production impact. Key installation steps:
In parallel with the chiller replacement, the plant upgraded the mold's MTC from a basic on/off controller to a ZILLION MTC-DW dual-zone water-feded temperature controller with PID control and real-time temperature logging via the plant's SCADA system. This allowed the quality team to monitor mold surface temperature in real-time and generate trend reports for each production batch — directly addressing the EU GMP requirement for process parameter monitoring and trend analysis.
| Metric | Before (Air-Cooled Chiller) | After (ZILLION Water-Cooled System) | Improvement |
|---|---|---|---|
| Mold temperature stability | plus/minus 4 degC swing | plus/minus 0.5 degC | 88% reduction in fluctuation |
| Batch defect rate | 8.3% (cooling-related) | 1.1% (overall, all causes) | 87% reduction |
| Wall thickness variation | 0.08 mm max | 0.018 mm max | Within spec at all times |
| Environmental CARs (microbial) | 3 per year | 0 in 18 months | 100% elimination |
| EU GMP documentation cycles | 6 per year for cooling issues | 0 | 100% reduction |
| Metric | Before | After | Improvement |
|---|---|---|---|
| Line output (syringe bodies/year) | 45 million | 55 million | +22% |
| Unplanned cooling-related stops | 4 per year | 0 | 100% elimination |
| Annual scrap cost | EUR 285,000 | EUR 37,000 | EUR 248,000 saved |
| Annual energy cost | EUR 31,200 | EUR 28,800 | EUR 2,400 saved |
| Environmental testing costs | EUR 54,000 (3 events) | EUR 0 | EUR 54,000 saved |
| Total annual saving | — | — | EUR 304,400 |
Over 18 months of operation, the ZILLION system has operated with 99.7% availability — the only downtime being a single scheduled preventive maintenance window of 8 hours for water treatment system calibration. No compressor failures, no condenser coil cleaning events, and no unplanned maintenance calls. The dual-pump configuration has never required the standby pump to activate, but it has been tested monthly per the maintenance protocol.
The customer's original choice of an air-cooled chiller for a pharmaceutical application was a fundamental specification error. Air-cooled condensers are inherently sensitive to ambient conditions — their capacity varies 30-40% between a 5 degC winter morning and a 38 degC summer afternoon. For a pharmaceutical application requiring mold temperature stability of plus/minus 1 degC, this variability was unacceptable.
A water-cooled configuration using a properly sized cooling tower provides stable condensing pressure regardless of ambient temperature — because the tower's performance is governed by wet-bulb temperature (a function of air humidity, not dry-bulb temperature), which varies far less than ambient air temperature over the course of a day. In the Bavarian climate, summer wet-bulb temperatures rarely exceed 23 degC, allowing the tower to consistently deliver 32 degC condenser water even at 35 degC ambient.
Additionally, the closed-loop condenser water circuit with automatic water treatment eliminates the condensation and standing water that made the air-cooled condenser's environment a microbial risk. The cooling tower operates outdoors with continuous biocidal treatment, and the condenser circuit never exposes standing water to the production environment.
Q: Can this solution apply to other pharmaceutical plastic components beyond syringes?
A: Yes. The same principles apply to any pharmaceutical plastic molding application: IV bags, medication bottles (HDPE or PP), blister pack trays (PVC/PETG), and diagnostic test devices all require mold temperature stability within plus/minus 1-2 degC. The specific chiller size and cooling tower capacity would be calculated based on the molding machine size, material heat load, and cycle time.
Q: What water treatment is required for pharmaceutical cooling tower systems?
A: Condenser water for pharmaceutical applications should be maintained to VDI 3803 standards for industrial cooling water. Key parameters: pH 7.5-8.5, total dissolved solids below 1,500 mg/L, chloride below 300 mg/L, and no detectable Legionella bacteria. An automatic blowdown system, corrosion inhibitor, and quarterly microbiological testing are minimum requirements.
Q: How does the cooling tower perform in winter in cold climates?
A: The ZCT-25 cooling tower is equipped with basin heaters and frost protection controls for operation in ambient temperatures down to -15 degC. In very cold climates, the tower fan cycles on and off to prevent basin water from freezing while maintaining condenser water temperature above 20 degC. For applications in regions with extended sub-zero periods, basin insulation and heat trace on exposed piping are recommended.
Q: What documentation is required for pharmaceutical GMP compliance when upgrading cooling systems?
A: Under EU GMP Annex 11 (Computerized Systems) and Annex 15 (Qualification and Validation), a cooling system upgrade requires: Design Qualification (DQ), Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ). ZILLION and its European partners can provide standard IQ/OQ documentation packages. For critical applications, a User Requirement Specification (URS) should be prepared before equipment selection to ensure the system meets all process and regulatory requirements.
Pharmaceutical plastic molding demands cooling precision that air-cooled systems fundamentally cannot deliver consistently in warm production environments. The 87% reduction in defect rate and EUR 304,400 annual saving documented in this case study demonstrate that the investment in a properly specified water-cooled industrial chiller system — correctly sized, professionally installed, and maintained — pays back within months through quality improvement and eliminated unplanned downtime.
For pharmaceutical manufacturers experiencing cooling-related quality problems or approaching end-of-life for their air-cooled chillers, the engineering and financial case for a ZILLION water-cooled solution is compelling. Contact our technical team to discuss a cooling system assessment for your specific application, material, and regulatory requirements.
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