Abstract

A device for retaining and removing filaments of plastic material, or angel's hairs, from a flow of plastic material in form of granules, powders or flakes is disclosed. The device includes a main body defining a through channel through which the plastic material flows, a plurality of retractable elements carried by the main body and are movable between a retracted position, in which they leave the through channel unobstructed, and an extracted position, in which they protrude into the through channel for trapping the angel's hairs flowing together with the flow of plastic material along the through channel, and an actuating system for moving each retractable element between the retracted and extracted positions.

IPC Classes  ?

• B07B 1/52 - Cleaning with brushes or scrapers

Abstract

A method is described for measuring, in a multi-layer film obtained by blow extrusion process and formed by one or more layers of a first material and a second material, the total thickness of the first material and/or the second material. The method includes the steps of: a) acquiring by means of an X-ray sensor a first measurement signal representative of the total thickness of the film; b) acquiring by means of a capacitive sensor a second measurement signal which is the sum of the signals given by the first and second materials of the film. The signal given by each material of the film is a function of the thickness of the material; and c) calculating, from the first and second signals, the total thickness (L1 of the first material and/or the total thickness (L2) of the second material.

IPC Classes  ?

• G01B 7/06 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness for measuring thickness

Abstract

A method is described for measuring, in a multi-layer film having one or more layers of a first and a second material, the total thickness of the first material and/or the second material. The method includes: a) acquiring, by means of an optical or an ionizing radiation sensor, a first measurement signal (Sott) representative of the total thickness of the film; b) acquiring, by means of a capacitive sensor, a second measurement signal which is the sum of the signals given by the first and second material of the film. The signal given by each material of the film is a function of the thickness of the material; and c) calculating, from the first and second signal, the total thickness of the first material and/or the second material.

IPC Classes  ?

• G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness
• G01B 7/06 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness for measuring thickness
• G01B 7/14 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures

Abstract

A method for producing reels of plastic film by cast extrusion process is described. The steps include causing the film to flow from an extrusion head slit, adjusting its thickness, drawing the exiting film with an internally cooled roll, winding the film downstream of the roll to form reels of film, measuring the thickness of the film and adjusting the thickness of the film based on the thickness measurements provided by the thickness measuring device. The method further includes measuring a reference quantity of the film reels produced, comparing the reference quantity measured value with a design value of the reference quantity corresponding to the design value of the thickness of the film and if the measured value is different from the design value of the reference quantity, acting on adjustment means and/or on the thickness measuring device to obtain a desired film thickness.

IPC Classes  ?

• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• B29C 48/28 - Storing of extruded material, e.g. by winding up or stacking
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling

Abstract

An extrusion plant for the production of plastic films by blow extrusion process is disclosed, comprising: an extrusion head (T) having a die (F) from which in use plastic material is extruded to form a bubble (B), and a system (10) for removing vapours of monomeric and aliphatic nature resulting from the extrusion process of the plastic material through the extrusion head (T). The vapour removal system (10) comprises a plurality of filtering devices (12) and a suction unit connected to the filtering devices (12). Each filtering device (12) comprises a support casing (14), a filter (16) carried by the support casing (14) to retain the vapours of monomeric and aliphatic nature contained in the air sucked in by the suction unit through the filtering device (12), and an intake duct (18) connected on one side to the support casing (14) downstream of the filter (16) and on the other side to the suction unit. The filtering devices (12) are arranged around the extrusion head (T) and beneath the cooling ring (A) of the extrusion unit and are attached to the cooling ring (A) so as to be removable from the latter independently of each other.

IPC Classes  ?

• B29C 48/10 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
• B29C 48/76 - Venting meansDegassing means
• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/27 - CleaningPurgingAvoiding contamination

Abstract

A system for the treatment of plastic films is described. The system includes a stretching station which stretches the film by subjecting it to permanent longitudinal expansion and a reinforcing station upstream of the stretching station. The reinforcing station reinforces edge areas on opposite sides of the film while the film is advanced along a feed direction, so as to increase the transversal tensile strength of the edge areas of the film. The reinforcing station also increases the thickness of the edge areas of the film and, for this purpose, includes a pair of applicator devices, each of which are associated with a film edge zone and are arranged to apply additional material on the edge areas.

IPC Classes  ?

• B29C 55/06 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
• B29L 7/00 - Flat articles, e.g. films or sheets

Abstract

A cooling ring (2) for an apparatus for the production of plastic blown film is described, which comprises a hollow body (7) extending around a central bore and having at least one inlet opening for a flow of cooling air and at least one outlet opening facing said central bore, so that the airflow entering the hollow body (7) through said at least one inlet opening leaves the hollow body (7) through said at least one outlet opening to be blown onto a tubular film (FT) that, after leaving an extrusion head (1) of the apparatus, is moved forward through said central bore. The cooling ring (2) further comprises a turbulator device (14) which is positioned within the hollow body (7) and is configured to generate turbulence in the air flowing through the hollow body (7). The turbulator device (14) comprises a plurality of flow-perturbating elements (16, 18) which are arranged distributed along at least one circumferential ring around the central bore of the hollow body (7) so as to make the airflow leaving the hollow body (7) through said at least one outlet opening uniform.

IPC Classes  ?

• B29C 48/10 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
• B29C 48/255 - Flow control means, e.g. valves
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling
• B29C 48/92 - Measuring, controlling or regulating

Abstract

A device (12) for retaining and removing filaments of plastic material, or angel's hairs, from a flow of plastic material in form of granules, powders or flakes is described, comprising a main body (14) defining a through channel (16) intended to be passed through by the flow of plastic material; a plurality of retractable elements (26a, 26b, 26c, 26d) which are carried by the main body (14) and are movable between a retracted position, in which they leave the through channel (16) unobstructed, and an extracted position, in which they protrude into the through channel (16) so as to create a trap for trapping the angel's hairs flowing together with the flow of plastic material along the through channel (16); and actuating means (32a, 32b, 32c, 32d, 34a, 34b, 34c, 34d, 36a, 36b, 36c, 36d) for moving each retractable element (26a, 26b, 26c, 26d) between the retracted position and the extracted position.

IPC Classes  ?

• B07B 7/06 - Selective separation of solid materials carried by, or dispersed in, gas currents by impingement against sieves
• B29B 7/60 - Component parts, details or accessoriesAuxiliary operations for feeding, e.g. end guides for the incoming material
• B07B 1/52 - Cleaning with brushes or scrapers

Abstract

2cap12ottcap122) of the second material.

IPC Classes  ?

• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness
• G01B 7/06 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness for measuring thickness
• B29C 48/10 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Abstract

12xcap12xcap122) of the second material.

IPC Classes  ?

• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
• B29C 48/10 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
• G01B 11/06 - Measuring arrangements characterised by the use of optical techniques for measuring length, width, or thickness for measuring thickness
• G01B 7/06 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width, or thickness for measuring thickness
• B29C 48/08 - Flat, e.g. panels flexible, e.g. films

Abstract

A method for producing reels (B) of plastic film (F) by cast extrusion process is described, comprising the steps of: (a) causing the film (F) to flow out from a slit (12) of an extrusion head (10) by adjusting its thickness by means of adjustment means (26); (b) drawing the film (F) exiting the extrusion head (10) by means of an internally cooled roll (14); (c) winding the film (F) coming from the roll (14) by means of a winding unit (16) placed downstream of the roll (14) so as to form reels (B) of film (F), (d) measuring the thickness of the film (F) by means of a thickness measuring device (22) interposed between the roll (14) and the winding unit (16), and (e) controlling the adjustment means (26) to adjust the thickness of the film (F) based on the thickness measurements provided by the thickness measuring device (22). According to the invention, the method further comprises the steps of: (f) measuring a reference quantity of the film reels (B) produced, said reference quantity depending on the thickness of the film (F); (g) comparing the measured value of said reference quantity with a design value of said reference quantity corresponding to the design value of the thickness of the film (F); and (h) if the measured value is different from the design value of said reference quantity, acting on said adjustment means (26) and/or on said thickness measuring device (22) to obtain a thickness of the film (F) corresponding to the desired one.

IPC Classes  ?

• B29C 48/28 - Storing of extruded material, e.g. by winding up or stacking
• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/305 - Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling

Abstract

A system for the treatment of plastic films (F) is described, comprising a stretching station arranged to stretch the film (F) by subjecting it to permanent longitudinal expansion and, upstream of the stretching station, a reinforcing station (10) arranged to reinforce edge areas on opposite sides of the film (F), while the film (F) is advanced along a feed direction (x), so as to increase the transversal tensile strength of said edge areas of the film (F). The reinforcing station (10) is configured to increase the thickness of the edge areas of the film (F) and for this purpose comprises a pair of applicator devices (12, 12') which are associated each with a respective film edge zone (F) and are arranged to apply additional material on said edge areas.

IPC Classes  ?

• B29C 55/06 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
• B29C 55/28 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of blown tubular films, e.g. by inflation

Goods & Services

Plastics welding machines; Machines for processing plastics; Machines for plastics working; Machinery for shaping plastic material; Machine tools; Machines and machine tools for treatment of materials and for manufacturing; Motors, other than for land vehicles; Machine coupling and transmission components (except for land vehicles). Construction services; Machinery installation, maintenance and repair; Repair of machines; Installation of plant; Plant maintenance. Industrial analysis and research services; Design and development of computer hardware and software; Scientific technological services; Conducting technical project studies; Technological studies relating to machine tools; Scientific services and design relating thereto; Technological services and design relating thereto; Scientific research.

Abstract

Disclosed is an apparatus for the production of a blown tubular film (FT). The apparatus includes an independent device for the localized thickness adjustment at the strips adjacent to the folding edges resulting from the flattening of the tubular film (FT) by means of adjustment elements formed in angular sectors of limited extension symmetrically arranged 180° apart. The independent device for the localized thickness adjustment being a volumetric type device having a rotating ring that performs a rotating adjustment of the flow rate of a cooling air stream which takes into account the angular offset resulting from the operational parameters of the apparatus.

IPC Classes  ?

• B29C 48/92 - Measuring, controlling or regulating
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 55/28 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of blown tubular films, e.g. by inflation

Abstract

A continuous dosing device includes a hopper (1) equipped with a first weighing system (4) and configured to feed a material through a continuous feeder (3) and to receive said material from a loader (5), an intermediate hopper (6) being arranged between the hopper (1) and the loader (5) in order to receive the material from the loader (5) and load it into the material hopper (1), the intermediate hopper (6) being equipped with a second weighing system (7) independent from the first weighing system (4).

IPC Classes  ?

• G01G 11/08 - Apparatus for weighing a continuous stream of material during flowConveyor-belt weighers having means for controlling the rate of feed or discharge
• G01G 13/02 - Means for automatically loading weigh-pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism

Goods & Services

Machinery for the manufacture and working of plastics; Installations for the manufacture and working of plastics; Parts of machines for the manufacture and working of plastics; Machine tools; Power tools; Machines for the manufacture and measurement of manufactured goods of plastic; Machines and fittings for the manufacture of manufactured goods of plastic; Motors and engines (except for land vehicles); Machine coupling and transmission components (except for land vehicles); Incubators for eggs; Automatic vending machines; Agricultural implements, other than hand-operated; excluding paper processing machines and cross cutters. Building construction; Maintenance of machines for the manufacture and measurement of manufactured goods of plastic; Maintenance of machines and fittings for the manufacture of manufactured goods of plastic; Repair of machines; Installation of plant. Industrial analysis and research services; Design and development of computer hardware and software; Science and technology services; Research relating to technology; Scientific services and design relating thereto; Technological services and design relating thereto; Scientific research.

Goods & Services

Machinery for the manufacture and working of plastics; Installations for the manufacture and working of plastics; Parts of machines for the manufacture and working of plastics; Machine tools; Power tools; Machines for the manufacture and measurement of manufactured goods of plastic; Machines and fittings for the manufacture of manufactured goods of plastic; Motors and engines (except for land vehicles); Machine coupling and transmission components (except for land vehicles); Incubators for eggs; Automatic vending machines; Agricultural implements, other than hand-operated. Building construction; Maintenance of machines for the manufacture and measurement of manufactured goods of plastic; Maintenance of machines and fittings for the manufacture of manufactured goods of plastic; Repair of machines; Installation of plant. Industrial analysis and research services; Design and development of computer hardware and software; Science and technology services; Research relating to technology; Scientific services and design relating thereto; Technological services and design relating thereto; Scientific research.

Abstract

A batcher for granular materials comprises a plurality of gravimetric hoppers (1) each of which is designed to feed an underlying scale (2) through a respective bottom outlet (3) which is closable by a respective gate (4) driven by a relative actuator (5), a discharge tube (6) being formed below the gate (4) and closable at its inner end by a shutter (7) movable between a closing position, in which it allows the material dropping from the outlet (3) to travel towards the scale (2), and an opening position in which it acts as a deflector to direct the material towards the discharge tube (6).

IPC Classes  ?

• G01G 13/02 - Means for automatically loading weigh-pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism
• G01F 11/40 - Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement with supply or discharge valves of the rectilinearly-moved slide type for fluent or solid material
• G01F 15/00 - Details of, or accessories for, apparatus of groups insofar as such details or appliances are not adapted to particular types of such apparatus

Abstract

Apparatus for the production of a blown tubular film (FT) comprising an extrusion head (1), a cooling ring (2) containing a primary device for the adjustment of the thickness profile, a haul-off (5) that draws and flattens the tubular film (FT) into a flattened film (FA), means suitable to perform a stretch of the flattened film (FA), a device (4) that measures the thickness profile, means to perform a rotating/oscillating relative motion between the extrusion head (1) and the haul-off (5), the cooling ring (2) further containing an independent device for the localized thickness adjustment at the strips adjacent to the folding edges resulting from the flattening of the tubular film (FT) by means of adjustment elements formed in angular sectors of limited extension symmetrically arranged 180° apart, the independent device for the localized thickness adjustment being a volumetric type device comprising a rotating ring that performs a rotating adjustment of the flow rate of a cooling air stream taking into account the angular offset resulting from the operational parameters of the apparatus.

IPC Classes  ?

• B29C 47/88 - Heating or cooling the stream of extruded material
• B29C 47/92 - Measuring, controlling or regulating
• B29C 55/28 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of blown tubular films, e.g. by inflation
• B29C 47/08 - Component parts, details or accessories; Auxiliary operations

Abstract

A calibration cage for the production of a blown film comprises a supporting structure (1) and a plurality of frames (2) rotatable in the horizontal plane which are pivoted along the perimeter of the supporting structure (1) at the vertices of a regular polygon, each frame (2) carrying a vertical rod (3) rotatable with respect thereto which in turn carries at least one element (4) for guiding a blown film, each vertical rod (3) being connected to the vertical rods (3) adjacent thereto through connection elements (8) that are rigid in the horizontal plane yet have a length variable in said plane, each connection element (8) being pivoted between two horizontal pivots each of which forms with a vertical radial plane comprising the axis of rotation of the respective vertical rod (3) an angle that is equal to half of the internal angle (a) of said regular polygon.

IPC Classes  ?

• B29C 47/90 - with calibration or sizing
• B29C 47/92 - Measuring, controlling or regulating
• B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)

Abstract

A device arranged in the cooling ring of an apparatus for the production of blown films in order to adjust the thickness profile thereof is disclosed. The device includes a plurality of equally spaced motor-driven actuators that adjust the flow rate of the flow of a cooling fluid directed towards a forming cone, as well as a plurality of equally spaced resistances provided with finned dissipators arranged in the path of the cooling flow. In this way, the device combines the characteristics of low power consumption and high adjustment velocity of a volumetric device with the higher angular resolution achievable through the heating elements of a thermal device, and all of this with an operating method that prevents the risks of bubble instability or adhesion, achieves a high energy efficiency and guarantees a wide thickness adjustment range.

IPC Classes  ?

• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• B29C 48/92 - Measuring, controlling or regulating
• B29C 55/28 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of blown tubular films, e.g. by inflation
• B29C 48/25 - Component parts, details or accessoriesAuxiliary operations
• B29C 48/88 - Thermal treatment of the stream of extruded material, e.g. cooling
• B29C 48/10 - Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
• B29L 7/00 - Flat articles, e.g. films or sheets

Abstract

A device for positioning a sensor (4) in a plant for the production of blown films comprises a rigid traverse (3) rotatably mounted on a pair of trolleys (2) that follow a circular track (1) and can be moved individually, the structure of the rigid traverse (3) being made up of at least three mutually sliding parts (3a, 3b, 3c) and the sensor (4) being mounted on the rigid traverse (3) at a central position and radially oriented towards the center of the circular track (1) on an intermediate part (3b) that is not secured to the trolleys (2) and always keeps the sensor (4) at a central position.

IPC Classes  ?

• G01B 5/00 - Measuring arrangements characterised by the use of mechanical techniques

Abstract

In a device for removing a coreless roll from a spindle consisting of a lateral wall (1), provided with through holes (7), which defines an internal chamber (2) closed at a first end by a plug (3), in which a compressed air feed duct (4) is formed, and at a second end by a head wall (5), on the external surface of the lateral wall (1 ) there is formed a network of surface channels in communication with the through holes (7) and suitable to distribute the compressed air over substantially the whole surface of the lateral wall (1), which is further provided with an external porous coating (6).

IPC Classes  ?

• B65H 19/22 - Changing the web roll in winding mechanisms or in connection with winding operations
• B65H 19/30 - Lifting, transporting, or removing the web rollInserting core
• B65H 75/10 - Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes

Abstract

A device arranged in the cooling ring of an apparatus for the production of blown films in order to adjust the thickness profile thereof comprises a plurality of equally spaced motor-driven actuators (5) that adjust the flow rate of the flow of a cooling fluid directed towards a forming cone (2), as well as a plurality of equally spaced resistances (11) provided with finned dissipators (12) arranged in the path of the cooling flow. In this way, the device combines the characteristics of low power consumption and high adjustment velocity of a volumetric device with the higher angular resolution achievable through the heating elements of a thermal device, and all of this with an operating method that prevents the risks of bubble instability or adhesion, achieves a high energy efficiency and guarantees a wide thickness adjustment range.

IPC Classes  ?

• B29C 47/88 - Heating or cooling the stream of extruded material
• B29C 47/92 - Measuring, controlling or regulating
• B29C 55/28 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of blown tubular films, e.g. by inflation
• B29C 47/08 - Component parts, details or accessories; Auxiliary operations

Abstract

Dosing apparatus comprising at least one load cell (18, 19, 20, 21, 22) and a plurality of hoppers (1, 2, 3, 4, 5, 6), each hopper (1, 2, 3, 4, 5, 6) being suitable for containing a material to be mixed with other materials which can be contained in the remaining hoppers (1, 2, 3, 4, 5, 6) and being provided with an outlet (7, 8, 9, 10, 11), a mixing collector (17) being arranged below the hoppers (1, 2, 3, 4, 5, 6) for receiving the materials which are discharged by gravity from the outlets (J, 8, 9, 10, 11) of the hoppers (1, 2, 3, 4, 5, 6), which are mechanically connected to load cells (18, 19, 20, 21, 22) for measuring individually the weights of the materials contained in each hopper (1, 2, 3, 4, 5, 6). The present invention also relates to a dosing process which can be carried out by means of said apparatus.

IPC Classes  ?

• B01F 15/00 - Accessories for mixers
• B01F 15/04 - Forming a predetermined ratio of the substances to be mixed