Wrapid Manufacturing Ltd. is a high-quality specialist converter and manufacturer supplying food and industrial customers globally as Europe’s largest distributor of DuPont Teijin Mylar® polyester films. Wrapid has a world-class reputation for Excellence and is contracted to leading manufacturers both for conversion and distribution of their branded products.

Wrapid Holdings Ltd has special clean room operations in Bradford for slitting specialist films. It has a long-term contract with Dupont for the conversion of Riston ® dry photoresist films which are used in the production of printed circuit boards. These are produced for distribution throughout Europe, the Middle East and Africa. Mill size film rolls are delivered from their global manufacturing facilities to Bradford for storage prior to conversion in the special purpose-built clean room facility, operating to BS EN ISO 9001-2000 standards.

These photoresist films must be kept below 25C otherwise irreversible degradation takes place. In the past, this had been managed by ensuring that the films were stored at the lowest tiers of the warehouse. As manufacturing volumes have increased this is now no longer always possible.

A solution was needed to ensure that the storage criteria was met by regulation standards and complied with to adjust to the weather condition experienced in the UK.

An installation consisting of five ECP EcoCooler side discharge evaporative coolers were made at a low level. The discharge air was directed down the middle of the corridors and extraction was provided at high levels in the warehouse. This provides a cross-flow ventilation pattern exploiting the natural convection currents. Cool air is brought in at the lowest levels and the warm air is extracted at high level.

With a maximum flow rate of 14,000m3/hr EcoCoolers contain an inbuilt fan and evaporative cooling pads.  This evaporative cooler is designed to be externally mounted and should be used as part of a mechanical ventilation system with a paired extract fan.

The actual temperature performance over a four-day period is shown. This is during a very hot period of weather, as it is unusual for the temperature in the UK to exceed 30C. The evaporative cooling solution also ‘evens out’ the temperature profile experienced over a 24-hour cycle by not allowing massive spikes in temperature.