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Progressing cavity pumps help produce books
applications general
Progressing cavity pumps help produce books Comstock & Wescott Inc, situated in Cambridge, Massachusetts, USA, has a range of adhesive premelters for book binding that utilize Moyno’s progressing cavity (PC) pump supplying viscous glues at temperatures of up to 400 °F (204 °C).
Comstock & Wescott Inc manufacture precision hot melt adhesive systems for the bookbinding industry in North America, Europe, and around the world. The company started out many years ago supplying the local market in Cambridge, USA, which includes Harvard College, one of America’s prestigious Ivy League universities, and has grown over the years to become an international presence in bookbinding. One of the major factors in its continued growth was the introduction of a new range of adhesive premelters in the 1980s for the ‘perfect binding’ process. The term ‘perfect binding’ refers to the fastening of the pages of books and magazines using a hot melt glue after they have been printed, trimmed and gathered together. The process is quicker and more efficient than old-fashioned mechanical binding methods. There is a Moyno L-3 PC Pump in every Comstock & Wescott adhesive premelter, hundreds of which are now scattered across the world. The predicted dependability of the Moyno pump was instrumental in its selection for the bookbinding duty. Comstock & Wescott (C&W) has certainly been proved correct in its estimations, with the reliability of the L-3 pump having been tested and proven over a long application period.
adhesive through perfect binding equipment. For this reason, C&W specified Moyno’s L-3 pump with a variable speed drive. With this functionality, the C&W system can be adjusted from high to low outputs without any loss of control over the temperature range. As well as this, because the Moyno pump is a positive displacement unit, the flow rate is directly proportional to the speed of pump rotation, giving added flexibility. The maximum permissible flow is 200 lb/hr. The pump can operate with pressures as high as 500 lb/inch2 (34.5 bar) and, according to the manufacturers, is protected by mechanically acting friction clutches. The pump unit is fitted beneath the primary melting tank in C&W’s adhesive binding system.
When in operation, the pump feeds glue from the premelt chamber in C&W’s system into a heat exchanger at a rate of 200 lb/hr. There, the temperature of the glue is raised from 310 °F to 400 °F (154 to 204 °C) before the glue is pumped to an applicator on the production line machine, ready for use in the binding process. The machinery and process is fully automated.
Regulating flow rate Not all magazine or book plants have a steady production flow. Contract publishers, for instance, face variables such as differing page sizes, numbers of pages, types of paper, and amount of magazines or books printed – all of which affect, among other things, the flow rate of hot melt
WORLD PUMPS February 2005
www.worldpumps.com 19
Progressing cavity pumps help produce books Comstock & Wescott Inc, situated in Cambridge, Massachusetts, USA, has a range of adhesive premelters for book binding that utilize Moyno’s progressing cavity (PC) pump supplying viscous glues at temperatures of up to 400 °F (204 °C).
Comstock & Wescott Inc manufacture precision hot melt adhesive systems for the bookbinding industry in North America, Europe, and around the world. The company started out many years ago supplying the local market in Cambridge, USA, which includes Harvard College, one of America’s prestigious Ivy League universities, and has grown over the years to become an international presence in bookbinding. One of the major factors in its continued growth was the introduction of a new range of adhesive premelters in the 1980s for the ‘perfect binding’ process. The term ‘perfect binding’ refers to the fastening of the pages of books and magazines using a hot melt glue after they have been printed, trimmed and gathered together. The process is quicker and more efficient than old-fashioned mechanical binding methods. There is a Moyno L-3 PC Pump in every Comstock & Wescott adhesive premelter, hundreds of which are now scattered across the world. The predicted dependability of the Moyno pump was instrumental in its selection for the bookbinding duty. Comstock & Wescott (C&W) has certainly been proved correct in its estimations, with the reliability of the L-3 pump having been tested and proven over a long application period.
adhesive through perfect binding equipment. For this reason, C&W specified Moyno’s L-3 pump with a variable speed drive. With this functionality, the C&W system can be adjusted from high to low outputs without any loss of control over the temperature range. As well as this, because the Moyno pump is a positive displacement unit, the flow rate is directly proportional to the speed of pump rotation, giving added flexibility. The maximum permissible flow is 200 lb/hr. The pump can operate with pressures as high as 500 lb/inch2 (34.5 bar) and, according to the manufacturers, is protected by mechanically acting friction clutches. The pump unit is fitted beneath the primary melting tank in C&W’s adhesive binding system.
When in operation, the pump feeds glue from the premelt chamber in C&W’s system into a heat exchanger at a rate of 200 lb/hr. There, the temperature of the glue is raised from 310 °F to 400 °F (154 to 204 °C) before the glue is pumped to an applicator on the production line machine, ready for use in the binding process. The machinery and process is fully automated.
Regulating flow rate Not all magazine or book plants have a steady production flow. Contract publishers, for instance, face variables such as differing page sizes, numbers of pages, types of paper, and amount of magazines or books printed – all of which affect, among other things, the flow rate of hot melt
WORLD PUMPS February 2005
www.worldpumps.com 19