Method and apparatus for compensating for changes in viscosity in a two-component dispensing system
First Claim
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1. A mixing and dispensing system for mixing and dispensing at least two different polymeric materials which react chemically with one another when combined, said system comprising:
- a dispenser having a plurality of liquid flow inlets and an outlet;
first and second pump means for supplying a different liquid polymeric material under pressure to each of said liquid flow inlets of said dispenser, the liquid polymeric materials being combined with one another within said dispenser to form a mixture;
control means for adjusting the pressure at which at least one of said liquid polymeric materials is supplied to said inlets of said dispenser, when the flow of said materials through said dispenser is terminated, as a function of a change in the viscosity of the mixture of said liquid materials within said dispenser, said control means including a bypass flow path around at least one of said first and second pump means and an adjustable pressure regulator means for regulating the pressure in said bypass flow path.
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Abstract
A two-component mixing and dispensing system for mixing and dispensing two-component polymeric materials which react chemically with one another when combined to form a mixture includes a controller for adjusting the pressure at which at least one of the components is supplied to a dispenser dependent upon variations in the parameters which affect the cure time of the mixture.
88 Citations
17 Claims
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1. A mixing and dispensing system for mixing and dispensing at least two different polymeric materials which react chemically with one another when combined, said system comprising:
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a dispenser having a plurality of liquid flow inlets and an outlet; first and second pump means for supplying a different liquid polymeric material under pressure to each of said liquid flow inlets of said dispenser, the liquid polymeric materials being combined with one another within said dispenser to form a mixture; control means for adjusting the pressure at which at least one of said liquid polymeric materials is supplied to said inlets of said dispenser, when the flow of said materials through said dispenser is terminated, as a function of a change in the viscosity of the mixture of said liquid materials within said dispenser, said control means including a bypass flow path around at least one of said first and second pump means and an adjustable pressure regulator means for regulating the pressure in said bypass flow path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The method of mixing and dispensing at least two different polymeric materials which react chemically with one another when combined, comprising:
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supplying different liquid polymeric materials, under pressure, from first and second pump means to a dispenser wherein said materials are combined to form a mixture which is emitted from the dispenser; terminating the flow of the mixture from the dispenser; adjusting the pressure at which at least one of the liquid polymeric materials is supplied to the dispenser, prior to resumption of the flow of the mixture from the dispenser, as a function of a change in viscosity of the mixture within the dispenser, said adjusting step performed via operation of an adjustable pressure regulator means adapted to regulate the pressure in a bypass flow path around at least one of said first and second pump means. - View Dependent Claims (13, 14, 15)
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16. A method of mixing and dispensing comprising the steps of:
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a. intermittently dispensing a mixture of a first and second pressurized liquid polymeric material from an outlet of a dispenser, the first and second liquid polymeric materials supplied to the dispenser by first and second pump means, respectively; b. determining a steady state inlet pressure for each liquid polymeric material supplied to the dispenser from said first and second pump means when said mixture is dispensing under steady state flow conditions; c. determining and maintaining an off inlet pressure as a function of the respective steady state inlet pressures of each liquid polymeric material when said mixture is not being dispensed from the dispenser; and d. adjusting the off inlet pressure prior to resumption of the flow of the mixture from the dispenser, as a function of a change in viscosity of the mixture within the dispenser, said adjusting step performed via operation of an adjustable pressure regulator means adapted to regulate the pressure in a bypass flow path around at least one of said first and second pump means. - View Dependent Claims (17)
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Specification