Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Patent
1981-06-02
1983-06-07
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
425560, 26432817, B29G 350
Patent
active
043869025
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
When handling or treating plastic material, which in the form of raw material contains substances that may be toxic or may cause allergy symptoms of the work-people, the material, up to the time it is fed into the machine, must be packed in a packaging material preventing the emission of said substances. At the time of feeding the material into the machine, the packages are usually opened manually, and even if this takes place with great care there are great risks that sufficient amounts of said substances shall be emitted in order to cause injuries or inconveniences to the work-people.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a machine for handling or treating, especially moulding or extruding or dosage of plastic material which is available in packed form, in which machine the emission of harmful substances from the plastic material is prevented to the largest possible extent.
Another object of the invention is to provide a machine in which the opening of the package before its emptying takes place automatically under lowest possible emission of harmful substances from the material.
A further object of the invention is to provide a machine having means for conveniently and quickly charging the packages containing plastic material.
A machine according to the invention for handling or treating especially moulding, extruding or dosage of plastic material which is available in packed form comprises a nozzle and a feed channel for feeding the plastic material directly or indirectly to the nozzle, and is characterized by a device for emptying a package containing plastic material into said feed channel by deformation of the package after an outlet opening for the plastic material has been provided in the packaging material.
While the device for emptying the plastic material may in some cases serve as extruder the machine according to the invention preferably comprises a separate extrusion unit with an extrusion cylinder and a switch valve adapted to alternatively connect the extrusion cylinder with said feed channeland said nozzle.
The device for emptying the packages suitably comprises an emptying cylinder for accomodating the package and a driven, emptying piston slidable in and tightly fitting against the walls of said cylinder. In such case said extrusion unit can comprise a feeding head into which said feed channel opens and against which the emptying cylinder can be brought to tightly abut. The unit consisting of the emptying cylinder and the emptying piston and the driving means for the latter can be shiftable, suitably swingable, between a loading position in which a plastic package can easily be fed into the cylinder, and an emptying position in which the emptying cylinder is tightly connected to the feeding head. The active end surface of the emptying cylinder can suitably have a portion of reduced cross section for the formation of a peripheral groove between said portion and the wall of the emptying cylinder, said groove accomodating the mantle portion of the packaging material which is collapsed at the compression of the package containing plastic material.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail hereinbelow with reference to the accompanying drawings in which
FIGS. 1 and 2 show part of an embodiment of a machine according to the invention, partly in a vertical side section, and with an emptying unit for plastic packages comprised in the machine in a position for loading packages.
FIGS. 3, 4 and 5 illustrate the machine with the emptying unit in a position for starting, continuing and completed emptying of a plastic package.
FIG. 6 illustrates the machine with the emptying unit in a position immediately before the ejection of an emptied package.
FIGS. 7 and 8 illustrate partially and in plane view and side elevation respectively a device for gripping and perforating a plastic material package.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The machine shown in the drawings comprises
REFERENCES:
patent: 2327079 (1943-08-01), Wacker
patent: 2338607 (1944-01-01), Wacker
patent: 3268636 (1966-08-01), Angell
Carlstein Jan
Jonsson Sven
Fjellman Press AB
Pavelko Thomas P.
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