Evaluation of high velocity impingement hoods applied to conventional drying cylinders

Given the trend towards higher speeds and single-tier configurations as wel l as limitations in wet pressing, drying sections are becoming increasingly long. In order to address this issue investigations were made into the app lication of impingement drying hoods to conventional cylinders. Pilot trial s show that impingement yields drying rates greater than those of steam cyl inders with no detrimental effect on paper properties and may be applied to successfully control curl.