Method for dispensing foam onto substrates of large width
AssigneeNordson Corporation
InventorsRonald Burger, Frank Jones, Dirk Pannhausen
Life of this patent
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Abstract
A method for dispensing a foamed material onto a substrate surface, including: generating a relative movement between a substrate surface and a material dispensing apparatus exit opening, mixing at least two material components in a mixing device, generating a pressure differential between the mixing device and a dispensing region, conveying the dispensing material from the mixing device to the exit opening, and discharging the dispensing material from the exit opening onto the substrate surface.
Claims12
A method for dispensing a foamed material onto a substrate surface, comprising:
- generating a relative movement between the substrate surface and an exit opening of a material dispensing apparatus, the exit opening including a slot oriented parallel to the substrate surface to be coated and transverse to the relative movement, the slot including an elongate width and a plurality of slot sections arranged along the elongate width,
- mixing at least two material components in a mixing device to form a free-flowing foamable dispensing material,
- generating a pressure differential between the mixing device and a dispensing region located downstream in the direction of flow from the exit opening,
- conveying the dispensing material from the mixing device to the material dispensing apparatus and to the exit opening,
- discharging the dispensing material from the exit opening onto the substrate surface by discharging a uniform flow rate of the dispensing material from each of the plurality of slot sections to ensure that the dispensing material is discharged uniformly across the elongate width of the slot, and
- maintaining a pressure of the dispensing material such that the dispensing material in a region upstream in the direction of flow from the exit opening exhibits a first foaming rate that is less than 10% of a second foaming rate occurring at the end of the foaming process following discharge from the exit opening.
A method for dispensing a foamed material onto a substrate surface, comprising:
- generating a relative movement between the substrate surface and an exit opening of a material dispensing apparatus, the exit opening including a plurality of exit opening sections arranged along an elongate width of the substrate surface,
- mixing at least two material components in a mixing device to form a free-flowing foamable dispensing material,
- generating a pressure differential between the mixing device and a dispensing region located downstream in a direction of flow from the exit opening with a first feed pump,
- conveying the dispensing material from the mixing device to the material dispensing apparatus with the first feed pump, and further conveying the dispensing material to the plurality of exit opening sections with a plurality of second feed pumps operating in parallel at the material dispensing apparatus,
- discharging the dispensing material from the exit opening onto the substrate surface by discharging a uniform flow rate of the dispensing material from each of the plurality of exit opening sections to ensure that the dispensing material is discharged uniformly across the elongate width of the substrate surface, and
- maintaining a pressure of the dispensing material such that the dispensing material in a region upstream in the direction of flow from the exit opening exhibits a first foaming rate that is less than 10% of a second foaming rate occurring at the end of the foaming process following discharge from the exit opening.
Dependencies are inferred from the claim text.