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Crown Packaging’s Aintree manufacturing plant is using a carbon infrared (CIR) system from Heraeus Noblelight in the curing of a lacquer applied to the longitudinal weld of metal containers.

The plant manufactures containers for products including industrial oils and foodstuffs. After being cut and formed from sheet material, the cans are longitudinally welded. It is then important that this weld is internally coated with a lacquer to prevent contamination of any food products and to protect the weld from attack from aggressive contents. The lacquer is applied by spray and must then be cured.

Crown’s existing foil heating system was unable to meet the stringent curing requirements of the new lacquer formulation. It turned to Heraeus Noblelight, which carried out proving tests with CIR at its Neston Application Centre. These tests proved successful and so a small-scale test unit was supplied to Crown for on-site trials. This led to an 84kW CIR system being installed. It consists of three 28kW CIR modules, each fitted with two 14kW CIR emitters.

The infrared heat is applied from the outside of the container and the heat is conducted through the weld to cure the lacquer on the can inside. Each module’s output can be independently manually regulated so that heating profiles can be matched to specific can sizes. Alternatively, the line speed can be varied to vary the can dwell time under the heaters.

Key benefits of product application

  • The previous foil system required considerable maintenance, and therefore the Heraeus Noblelight installation has resulted in a reduction in line downtime at Crown Packaging.
  • The CIR system is said to ensure the correct lacquer cure.
  • Unlike the previous foil system, which required considerable guarding to prevent unwarranted access, the CIR modules are already totally sealed.
  • So far, Crown Packaging has not experienced any CIR emitter failures.

Crown uses CIR system from Heraeus to cure lacquer on metal container welds

Crown Packaging’s Aintree manufacturing plant is using a carbon infrared (CIR) system from Heraeus Noblelight in the curing of a lacquer applied to the longitudinal weld of metal containers.

The plant manufactures containers for products including industrial oils and foodstuffs. After being cut and formed from sheet material, the cans are longitudinally welded. It is then important that this weld is internally coated with a lacquer to prevent contamination of any food products and to protect the weld from attack from aggressive contents. The lacquer is applied by spray and must then be cured.

Crown’s existing foil heating system was unable to meet the stringent curing requirements of the new lacquer formulation. It turned to Heraeus Noblelight, which carried out proving tests with CIR at its Neston Application Centre. These tests proved successful and so a small-scale test unit was supplied to Crown for on-site trials. This led to an 84kW CIR system being installed. It consists of three 28kW CIR modules, each fitted with two 14kW CIR emitters.

The infrared heat is applied from the outside of the container and the heat is conducted through the weld to cure the lacquer on the can inside. Each module’s output can be independently manually regulated so that heating profiles can be matched to specific can sizes. Alternatively, the line speed can be varied to vary the can dwell time under the heaters.

Key benefits of product application

  • The previous foil system required considerable maintenance, and therefore the Heraeus Noblelight installation has resulted in a reduction in line downtime at Crown Packaging.
  • The CIR system is said to ensure the correct lacquer cure.
  • Unlike the previous foil system, which required considerable guarding to prevent unwarranted access, the CIR modules are already totally sealed.
  • So far, Crown Packaging has not experienced any CIR emitter failures.

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