Dispensing – Processes of dispensing
Patent
1994-05-23
1996-06-25
Kashnikow, Andres
Dispensing
Processes of dispensing
222135, 2221456, 2221851, B67B 700
Patent
active
055292127
DESCRIPTION:
BRIEF SUMMARY
FIELD
The present invention concerns a method of and apparatus for transporting and conditioning casting materials and for charging casting machines with them. The materials can be resins, blends (of such resins and of curer for example), or components of such blends. The invention is specifically intended for materials that fillers have been added to when the fillers tend to settle to the bottom. Several tanks hold the casting material or components. The holding tanks have open tops with lids or intakes with caps and the air can preferably be evacuated from them. Associated with each holding tank is an extruder that accommodates a plunger and releases discrete portions of the material. The plunger is actuated by drive mechanisms and opens and closes the tank's outlet.
STATE OF THE ART
A method that is essentially similar except that it does not involve transporting the materials is known from German 3 803 418 A1, which derives from the present applicant.
The publication also discloses apparatus or mechanisms for carrying out the method (with the exclusion of transportation). The apparatus comprises a plasticizing section with casting machines and at least one tank for holding casting materials or components. The tanks have open tops with lids or intakes with caps and the air can be evacuated from them. Extruders release discrete portions of the material or component to such downstream devices as blenders and casting machines.
Although the known method and apparatus are mostly satisfactory, they have significant drawbacks from the increasingly significant aspect of environmental protection.
These drawbacks derive in particular from the aromatic solvents that are often part of the blends employed to embed electronic components for example. Such solvents constitute hazards not only for the plant personnel but for the environment in general.
Another drawback is that the materials come in containers that cause problems not only in their manufacture but also in their disposal. The empty containers always contain residue that can be dangerous whether the containers are burned or landfilled.
The containers are also expensive to manufacture and dispose of. The conventional methods and apparatus employed to handle such materials require labor-intensive and costly safety measures to prevent as many pollutants as possible from escaping from the system and injuring people or damaging the environment.
Destructive fumes occur in particular when blends containing fillers susceptible to setting are kneaded.
The object of the present invention is accordingly an improved method and an improved apparatus of the aforesaid genus that will have the aforesaid drawbacks to a limited extent if at all.
This object is attained in a method of the aforesaid genus by characteristics that will now be described. The materials are loaded into the tanks with the outlets closed and the tops or intakes open, the tops or intakes are closed, and the air is optionally evacuated from the loaded tanks. The sealed tanks are kept on hand for a possibly long period or transported over a possibly long distance or both. The tanks are connected to the casting machines, the drive mechanisms are started, the materials are conditioned, and the casting machines charged with them.
No containers need to be manufactured to store the materials or transport them from one site to the other, and then to be disposed of. The time and labor involved in manufacturing and disposing of them are saved. Their contents do not have to be transferred to hoppers, entailing the risk of hazardous fumes escaping and the inconvenience of having to vacuum-extract them as must now be done when blends that have bottom-settling components are kneaded.
This embodiment of the method in accordance with the invention can have several convenient features. When for example the holding tank, like some state-of-the-art tanks, accommodates kneading blades, the blades can be coupled to drive mechanisms at the second site. Again, when, as at the state of the art, the holding tank has a con
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Douglas Lisa
Gerstenzang William C.
Kashnikow Andres
Verfahrenstechnik Hubers GmbH
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