Dispensing – Processes of dispensing
Patent
1996-08-09
1999-04-06
Huson, Gregory L.
Dispensing
Processes of dispensing
222 55, 222 63, 222257, B67B 700
Patent
active
058906231
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns the technique of supplying a fluid product such as an extendable foamy, liquid, or gaseous product, by placing the product under adjusted pressure in a nozzle.
The technique for supplying a fluid at an adjusted pressure (see, for example, U.S. Pat. No. 3,873,258) proves especially advantageous with respect to a conventional fluid-spraying procedure, in order to produce foam-based, and thus expandable, objects in a size and at a density which remain constant in one or more directions. In fact, the pressure controls the expansion of the foam, and, therefore, the size of the object produced by extrusion.
The conventional state of the art encompasses two approaches: This procedure entails the following problems: the constituent ineffective. the nozzle (see U.S. Pat. No. 3,873,258).
This approach comprises at least one tank from which a feed line extends, and at least one nozzle having means for closing and adjusting the opening of the nozzle, the device having an electrical control box incorporating a conventional electronic card. The electronic system continuously adjusts the opening of the nozzle in order to generate constant pressure, thereby making it possible to produce a constant flow rate, whatever the up-line pressure of the product.
This solution has the disadvantage of being bulky and extremely expensive.
In both cases, precise temperature control is necessary for products whose viscosity varies with temperature.
SUMMARY OF THE INVENTION
The invention is intended to solve these problems, so that, when the nozzle is opened, the pressure corresponds exactly to the pressure giving the proper flow rate, and so that this pressure remains constant.
To this end, in the device according to the invention, the tank is sealed by a plate connected to a pump used to pressurize the fluid continuously fed into the line, said pump being connected to a rod of a jack connected to a control unit equipped with a regulator electrically connected to the electronic card, the nozzle being connected to the regulator by means of a linked sensor connected to said electronic card.
In accordance with other characteristics:
To avoid the occurrence of a relatively long response time between the electric signal sent to the pressure regulator and the measurement at the pressure sensor of the nozzle, which may occur as a function of the compressibility of the product and of the elasticity of the fluid conduit, the means for opening and opening adjustment is connected to a speed regulator. The latter controls the opening of the nozzle so that the kinematics thereof are always identical and reproducible. This makes it possible to control circuit adjustment.
Furthermore, the fluid circuit formed by the tank, the pump, the line, and the nozzle is fluid-tight when the nozzle is sealed, and the jack is a hydraulic dual-rod jack.
The invention also concerns a process for the extrusion of a pressurized compressible material, which may be carried out using a device such as tat described above.
The process comprises at least the following steps: memory in an electronic card, card acting on pressurization means.
According to another feature of the process, the pressure of the material in the nozzle is kept constant.
BRIEF DESCRIPTION OF THE DRAWING
A non-limiting embodiment of the invention will now be described with respect to the single attached drawing, which illustrates diagrammatically a fluid-tight device for extrusion of a foam according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The device illustrated incorporates an extrusion nozzle 1 connected by means of a line 2 to a tank 3 which holds the foam 4.
The tank 3 is sealed by a sliding plate 5 connected to the rod 6 of a hydraulic dual-rod jack 7. A pump 8 is mounted on said rod 6 as an extension of the tank 3 and of the line 2.
The hydraulic jack 7 is connected by feed tubes 7a, 7a' to a control unit 9 equipped with a proportional pressure regulator 10 fitted with a tube 10a for circulation of t
REFERENCES:
patent: 3873258 (1975-03-01), Ratliff
patent: 4144986 (1979-03-01), Smith et al.
patent: 4535919 (1985-08-01), Jameson
patent: 4613059 (1986-09-01), Merkel
Huson Gregory L.
SEVA
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