Patents Assigned to Previero N. S.R.L.
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Patent number: 10792841Abstract: A method and apparatus for washing sheets of plastic material originating from industrial and agricultural waste, for subsequent reuse thereof as a raw material. The sheets of plastic material, precut into soiled pieces of large dimensions, and a water flow are supplied to a washing tank containing a water bath; a screw stirrer generates intense stirring of the water bath and recirculation, inside the tank, of the soiled plastic pieces that causes the contaminating material to be detached and separated by sedimentation from the plastic pieces. The cleaned pieces of plastic material of large dimensions, devoid of contaminant, which float in the water bath are removed by dragging, in a floating condition, along a discharging channel by the combined action of a dragging device and of a water flow that exits the washing tank; the dragging device, consisting of an endless belt, extends from one side of the washing tank along the discharging channel, supported in a freely tiltable manner.Type: GrantFiled: June 5, 2017Date of Patent: October 6, 2020Assignee: Previero N. S.r.l.Inventor: Flavio Previero
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Publication number: 20190217505Abstract: A method and apparatus for washing sheets of plastic material originating from industrial and agricultural waste, for subsequent reuse thereof as a raw material. The sheets of plastic material, precut into soiled pieces of large dimensions, and a water flow are supplied to a washing tank containing a water bath; a screw stirrer generates intense stirring of the water bath and recirculation, inside the tank, of the soiled plastic pieces that causes the contaminating material to be detached and separated by sedimentation from the plastic pieces. The cleaned pieces of plastic material of large dimensions, devoid of contaminant, which float in the water bath are removed by dragging, in a floating condition, along a discharging channel by the combined action of a dragging device and of a water flow that exits the washing tank; the dragging device, consisting of an endless belt, extends from one side of the washing tank along the discharging channel, supported in a freely tiltable manner.Type: ApplicationFiled: June 5, 2017Publication date: July 18, 2019Applicant: PREVIERO N. S.R.L.Inventor: Flavio PREVIERO
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Patent number: 9827693Abstract: A plant and a method for separating labels, caps and other contaminating materials from containers and bottles made of plastics, in particular bottles made of PET, in the field of treating and recycling plastics.Type: GrantFiled: May 23, 2014Date of Patent: November 28, 2017Assignee: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Patent number: 9796004Abstract: An apparatus and method for removing labels from containers made of plastics, such as PET bottles includes: a tubular stator and a rotor defining an annular chamber that extends along a path; on the rotor members are mounted for rotationally dragging and pushing the containers inside the annular chamber; on the tubular stator there are first scraping tools provided with first tip ends; the dragging and thrusting members include second scraping tools provided with second tip ends that are distributed along one or more helical paths; the first tip ends and the second tip ends define respectively in the annular chamber a first punctiform scraping surface and a second punctiform scraping surface for the containers, in which the distance between the first punctiform scraping surface and the second punctiform scraping surface is maintained substantially constant in a longitudinal and circumferal direction with respect to the rotor.Type: GrantFiled: April 15, 2014Date of Patent: October 24, 2017Assignee: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Patent number: 9776343Abstract: A method for separating materials of various type having different softening temperature values, includes pouring a mixture of flakes and fragments of materials on a movable receiving and conveying device in a uniformly distributed manner and advancing it along a first portion of path; actuating an electromagnetic inductor to heat an outer metal surface by electromagnetic induction, which surface is included in the movable receiving and conveying device to achieve a first lower softening temperature corresponding to a first material of the mixture; subjecting the mixture to a separating action during which a first fraction, remains stuck to the outer metal surface, whereas a remaining second fraction of materials having higher softening temperatures than the first softening temperature freely slips by gravity towards a lower receiving zone.Type: GrantFiled: November 20, 2014Date of Patent: October 3, 2017Assignee: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Publication number: 20160263777Abstract: A method for separating materials of various type having different softening temperature values, includes pouring a mixture of flakes and fragments of materials on a movable receiving and conveying device in a uniformly distributed manner and advancing it along a first portion of path; actuating an electromagnetic inductor to heat an outer metal surface by electromagnetic induction, which surface is included in the movable receiving and conveying device to achieve a first lower softening temperature corresponding to a first material of the mixture; subjecting the mixture to a separating action during which a first fraction, remains stuck to the outer metal surface, whereas a remaining second fraction of materials having higher softening temperatures than the first softening temperature freely slips by gravity towards a lower receiving zone.Type: ApplicationFiled: November 20, 2014Publication date: September 15, 2016Applicant: PREVIERO N. S.R.L.Inventor: Flavio PREVIERO
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Publication number: 20160158966Abstract: A plant and a method for separating labels, caps and other contaminating materials from containers and bottles made of plastics, in particular bottles made of PET, in the field of treating and recycling plastics.Type: ApplicationFiled: May 23, 2014Publication date: June 9, 2016Applicant: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Publication number: 20160059281Abstract: An apparatus and method for removing labels from containers made of plastics, such as PET bottles includes: a tubular stator and a rotor defining an annular chamber that extends along a path; on the rotor members are mounted for rotationally dragging and pushing the containers inside the annular chamber; on the tubular stator there are first scraping tools provided with first tip ends; the dragging and thrusting members include second scraping tools provided with second tip ends that are distributed along one or more helical paths; the first tip ends and the second tip ends define respectively in the annular chamber a first punctiform scraping surface and a second punctiform scraping surface for the containers, in which the distance between the first punctiform scraping surface and the second punctiform scraping surface is maintained substantially constant in a longitudinal and circumferal direction with respect to the rotor.Type: ApplicationFiled: April 15, 2014Publication date: March 3, 2016Applicant: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Publication number: 20130025630Abstract: A method and an apparatus for removing labels (12) and/or for washing containers (10) in recyclable plastic material; the containers (10) with labels (12) to be removed are supplied upwards from the bottom of a vertical screw feeder (15), in which a water flow is supplied from above to drag the removed labels (12?) downwards into a collection chamber (31) positioned underneath an inlet opening (20) for the containers (10) in the vertical screw feeder (15); the water flow for downwardly dragging the removed labels (12?), may also be used for removing contaminants and washing the containers (10) while they are moving upwards.Type: ApplicationFiled: April 6, 2011Publication date: January 31, 2013Applicant: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Patent number: 7824502Abstract: Tubular labels and contaminants can be removed from containers and/or bottles of plastic material to be recycled, by subjecting the containers and/or bottles to a first weak mechanical washing and slow centrifugating action, followed by a separation step for separating the removed labels and contaminants from the containers. The containers are subsequently subjected to a second strong mechanical washing and fast centrifugating action for the removal from the containers and/or bottles of any residual labels and contaminants.Type: GrantFiled: September 2, 2008Date of Patent: November 2, 2010Assignee: Previero N. S.r.l.Inventor: Flavio Previero
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Publication number: 20100192983Abstract: Tubular labels and contaminants can be removed from containers and/or bottles of plastic material to be recycled, by subjecting the containers and/or bottles to a first weak mechanical washing and slow centrifugating action, followed by a separation step for separating the removed labels and contaminants from the containers. The containers are subsequently subjected to a second strong mechanical washing and fast centrifugating action for the removal from the containers and/or bottles of any residual labels and contaminants.Type: ApplicationFiled: September 2, 2008Publication date: August 5, 2010Applicant: PREVIERO N. S.R.L.Inventor: Flavio Previero
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Patent number: 6216880Abstract: A filter device for separating particulate material from a stream of flowable plastics; the device comprises a body member having at least a filter chamber and a flow path extending between inlet and outlet sides. A filter band transversally extends in said filter chamber, across the flow path, being supported by a back-plate having a perforated area. An axially movable valving member comprising a flow passage for the plastic material, is provided into the chamber, and an actuator to axially move the valving member between an advanced and a retracted position in which the valving member connects respectively disconnects the flow passage from the inlet or the outlet sides of the device, and for sealingly clamping the filter band peripherally around the perforated area of the back-plate.Type: GrantFiled: July 28, 1999Date of Patent: April 17, 2001Assignee: Previero N. S.R.L.Inventor: Flavio Previero
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Patent number: 6149807Abstract: A self-locking filter-screen feeding device for plastic material; the device comprises a carriage which may be reciprocated on guide rods parallelly extending to a filter band movable across a flow-path for the plastic material to be filtered in a filter apparatus. The carriage is provided with a resting surface for the filter band and pressure members, angularly rotatable operatively connected to actuators for selectively engaging and urging the filter band against the resting surface and for reciprocating the carriage along the guide rods.Type: GrantFiled: July 26, 1999Date of Patent: November 21, 2000Assignee: Previero N. S.r.l.Inventor: Flavio Previero