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Process line increases output at worlds largest manufacture of metallic offset printing inks

Process line increases output at worlds largest manufacture of metallic offset printing inks PIGMENT AND RESIN TECHNOLOGY December 1991 Process line increases output a t worlds largest manufacture of metallic offset printing inks The demand for metallic offset inks from Wolstenholme Bronze Powders of Darwen, Lancs, has meant substantial capital investment for the automation of some processes to meet an order book that has virtually doubled since the acquisition of the well established metallic ink makers, Johnson Bloy. The new equipment, which includes a compact hydrosolver Trifoil mixer, a hydraulic discharge press and a semi-automatic filling machine, is specifically designed for handling the highly viscous ink product. All three machines were supplied by OBS Machines Ltd of Milton Keynes, who specialise in equipment for ink and paint manufacturers in the UK. The first machine in the new process line is a new variable speed hydraulically operated hydrosolver used for the premix which has a capacity of up to one tonne. to a working height level. A polythene sheet is then The hydrosolver has a special mixing blade configuration placed over the surface of the ink in the vessel and a designed to a Wolstenholme's specification to provide large 'O' ring seal is placed around the edge to provide a efficient mixing at low speeds whic h can range from 0 to seal when the piston is hydraulically lowered onto the ink surface. This ensures the minimum of air entrainment 140 rpm. This allows flexibility of mixing schedules to ensure the minimum of shear and heat build up which is until the ink is fully discharged. necessary for providing the highest quality ink. The ink is pushed under pressure through a discharge The mixing vessel is wheeled and locked into position outlet pipe directly into the new pneumatically driven De Vree semi-automatic volumetric filling machine. directly below its vacuum lid and mixing blades. The vessel, already filled with its base ingredients, receives This machine will accurately dispense from one to six the mixing blades and lid by lowering the headstock and kilos according to requirements. The De Vree machine, an airtight seal is made. combined with discharge press, provides a filling process that is very precise even after production stoppages. It provides highly repeatable accurate dosing. Process begins A solvent flushing system is also fitted for thorough The mixing process then begins and after about 15 cleaning of the dosing mechanism. minutes the lid is raised and a QC check is made before This new process line is also providing capacity to adding the bronze powder. The lid and blades are extend the range of other Wolstenholme products which lowered again to continue with mixing whilst rapidly include heat-set and UV metallic inks. adding the powder through a hopper into the vessel. Paul Fallon director of Ink Operations stresses that:- At this stage of the process it is critical that the mixing "WBP are committed to further investment to provide is controlled to provide the minimum of shear to the finest quality metallic inks for their customers homogenise the ink without damaging the delicate worldwide, and will continue to work closely with metallic flakes which provide the lustrous surface when production machinery suppliers in a constant effort to finally printed. To achieve silver ink, paste is added at the improve their ink quality and processing methods. mixing stage. The ink can take up to one hour to process and it has to Details: OBS Machines Ltd, Alston Drive, Bradwell be maintained as close as possible to ambient tempera­ Abbey, Milton Keynes, MK13 9HG. Tel: 0908 322644. ture. To achieve this the mixing vessel incorporates water cooling. Two electric motors provide the hydraulic power for the headstock and the mixing blades. When mixed, samples are taken for quality checks and when satisfactory the lid is sealed down and a vacuum is drawn to remove entrained air from the mix. Ink drying tests are then made before the next stage which is the packing of the ink into metal cans. The vessel is then wheeled to the newly installed discharge press whic h transfers the ink to the filling machine. After positioning the vessel in the press it is lifted hydraulically http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pigment & Resin Technology Emerald Publishing

Process line increases output at worlds largest manufacture of metallic offset printing inks

Pigment & Resin Technology , Volume 20 (12): 1 – Dec 1, 1991

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0369-9420
DOI
10.1108/eb042896
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Abstract

PIGMENT AND RESIN TECHNOLOGY December 1991 Process line increases output a t worlds largest manufacture of metallic offset printing inks The demand for metallic offset inks from Wolstenholme Bronze Powders of Darwen, Lancs, has meant substantial capital investment for the automation of some processes to meet an order book that has virtually doubled since the acquisition of the well established metallic ink makers, Johnson Bloy. The new equipment, which includes a compact hydrosolver Trifoil mixer, a hydraulic discharge press and a semi-automatic filling machine, is specifically designed for handling the highly viscous ink product. All three machines were supplied by OBS Machines Ltd of Milton Keynes, who specialise in equipment for ink and paint manufacturers in the UK. The first machine in the new process line is a new variable speed hydraulically operated hydrosolver used for the premix which has a capacity of up to one tonne. to a working height level. A polythene sheet is then The hydrosolver has a special mixing blade configuration placed over the surface of the ink in the vessel and a designed to a Wolstenholme's specification to provide large 'O' ring seal is placed around the edge to provide a efficient mixing at low speeds whic h can range from 0 to seal when the piston is hydraulically lowered onto the ink surface. This ensures the minimum of air entrainment 140 rpm. This allows flexibility of mixing schedules to ensure the minimum of shear and heat build up which is until the ink is fully discharged. necessary for providing the highest quality ink. The ink is pushed under pressure through a discharge The mixing vessel is wheeled and locked into position outlet pipe directly into the new pneumatically driven De Vree semi-automatic volumetric filling machine. directly below its vacuum lid and mixing blades. The vessel, already filled with its base ingredients, receives This machine will accurately dispense from one to six the mixing blades and lid by lowering the headstock and kilos according to requirements. The De Vree machine, an airtight seal is made. combined with discharge press, provides a filling process that is very precise even after production stoppages. It provides highly repeatable accurate dosing. Process begins A solvent flushing system is also fitted for thorough The mixing process then begins and after about 15 cleaning of the dosing mechanism. minutes the lid is raised and a QC check is made before This new process line is also providing capacity to adding the bronze powder. The lid and blades are extend the range of other Wolstenholme products which lowered again to continue with mixing whilst rapidly include heat-set and UV metallic inks. adding the powder through a hopper into the vessel. Paul Fallon director of Ink Operations stresses that:- At this stage of the process it is critical that the mixing "WBP are committed to further investment to provide is controlled to provide the minimum of shear to the finest quality metallic inks for their customers homogenise the ink without damaging the delicate worldwide, and will continue to work closely with metallic flakes which provide the lustrous surface when production machinery suppliers in a constant effort to finally printed. To achieve silver ink, paste is added at the improve their ink quality and processing methods. mixing stage. The ink can take up to one hour to process and it has to Details: OBS Machines Ltd, Alston Drive, Bradwell be maintained as close as possible to ambient tempera­ Abbey, Milton Keynes, MK13 9HG. Tel: 0908 322644. ture. To achieve this the mixing vessel incorporates water cooling. Two electric motors provide the hydraulic power for the headstock and the mixing blades. When mixed, samples are taken for quality checks and when satisfactory the lid is sealed down and a vacuum is drawn to remove entrained air from the mix. Ink drying tests are then made before the next stage which is the packing of the ink into metal cans. The vessel is then wheeled to the newly installed discharge press whic h transfers the ink to the filling machine. After positioning the vessel in the press it is lifted hydraulically

Journal

Pigment & Resin TechnologyEmerald Publishing

Published: Dec 1, 1991

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