A method for perforating a film of plastic material in which a main film (1) is perforated whilst it is slid through a perforating device (5) by a plurality of pressurised hot gas jets having a temperature above the melting temperature of the main film, in which the hot gas jets are correlated with the sliding speed of the main film (1), and in which reinforcing bands obtained from an auxiliary film of plastic material (2) are connected to the perforated main film (1), making the reinforcing bands adhere between parallel rows of base holes; subsequently the perforated main film (1) with the reinforcing bands is stretched in the longitudinal sliding direction. During perforating, the main film of plastic material (1) is pressed against a perforating template (22), making the main film of plastic material (1) instantaneously penetrate openings of the perforating template (22) by said hot gas jets. A hot gas perforating device (5) is also disclosed, as well as an apparatus suitable for perforating and sliding a film of plastic material according to the referred method.
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B26F 1/26 - Perforation par des moyens non mécaniques, p.ex. par un jet de fluide
B32B 3/16 - Produits stratifiés caractérisés essentiellement par le fait qu'une des couches comporte des discontinuités ou des rugosités externes ou internes, ou bien qu'une des couches est de forme générale non plane; Produits stratifiés caractérisés essentiellement par des particularismes de forme caractérisés par une couche discontinue, c. à d. soit continue et percée de trous, soit réellement constituée d'éléments individuels caractérisés par une couche de surface formée d'éléments individuels fixés à un "dos" flexible
B29L 7/00 - Objets plats, p.ex. pellicules ou feuilles
B32B 3/08 - Caractérisés par des caractéristiques de forme en des endroits déterminés, p.ex. au voisinage des bords caractérisés par des éléments ajoutés à des endroits déterminés
2.
METHOD AND APPARATUS FOR PERFORATING A FILM OF PLASTIC MATERIAL
A method for perforating a film of plastic material in which a main film (1) is perforated whilst it is slid through a perforating device (5) by a plurality of pressurised hot gas jets having a temperature above the melting temperature of the main film, in which the hot gas jets are correlated with the sliding speed of the main film (1), and in which reinforcing bands obtained from an auxiliary film of plastic material (2) are connected to the perforated main film (1), making the reinforcing bands adhere between parallel rows of base holes; subsequently the perforated main film (1) with the reinforcing bands is stretched in the longitudinal sliding direction. During perforating, the main film of plastic material (1) is pressed against a perforating template (22), making the main film of plastic material (1) instantaneously penetrate openings of the perforating template (22) by said hot gas jets. A hot gas perforating device (5) is also disclosed, as well as an apparatus suitable for perforating and sliding a film of plastic material according to the referred method.
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B26F 1/26 - Perforation par des moyens non mécaniques, p.ex. par un jet de fluide
B32B 3/08 - Caractérisés par des caractéristiques de forme en des endroits déterminés, p.ex. au voisinage des bords caractérisés par des éléments ajoutés à des endroits déterminés
B32B 3/16 - Produits stratifiés caractérisés essentiellement par le fait qu'une des couches comporte des discontinuités ou des rugosités externes ou internes, ou bien qu'une des couches est de forme générale non plane; Produits stratifiés caractérisés essentiellement par des particularismes de forme caractérisés par une couche discontinue, c. à d. soit continue et percée de trous, soit réellement constituée d'éléments individuels caractérisés par une couche de surface formée d'éléments individuels fixés à un "dos" flexible
3.
Machine for manufacturing pre-stretched extendable film rolls
A machine for manufacturing pre-stretched extendable film rolls provides for a pre-stretch unit (10) of the film (F) and a wrapping unit (100) of the film in roll provided with a series of rolls around which the advancing film is partially wrapped; the pre-stretch unit (10) provides for, in sequence, at least a first pre-stretching roll (12), a pre-stretching auxiliary roll (13) acting against the first roll (12) with the interposition of the film, and a second pre-stretching roll (14) having a speed greater than the speed of the first roll (12) to carry out the pre-stretching of the film; the wrapping unit provides for a wrapping roll (104) for wrapping the pre-stretched film; the pre-stretch unit (10) further provides for a detensioning roll (17) arranged downstream said second pre-stretching roll (14) and having a speed less than said second pre-stretching roll (14) and greater than said wrapping roll (104), so as to obtain a first detensioning of the film after the pre-stretching operation and a second detensioning of the film before the wrapping operation. A high quality pre-stretched film is obtained by this machine.
B29C 55/16 - Etirage suivant plusieurs axes suivant deux axes simultanément
B29C 55/00 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
B29L 7/00 - Objets plats, p.ex. pellicules ou feuilles
A machine for producing coils of prestretched extendible film has a prestretching unit (10) for prestretching the film (F) and a winding unit (100) for winding the film in a coil provided with a series of rollers around which the advancing film winds partially; the winding unit comprises a winding roller (104) in pressing contact against the coil (R) of the prestretched film in winding progress; to obtain coils of constant diameter and high winding quality the final contact position is varied of the winding roller (104) against the coil (R) according to the length of the wound film and according to the required diameter of coil.
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B65H 18/16 - Mécanismes d'enroulage des bandes dans lesquels l'énergie est appliquée à la bobine, p.ex. pour faire avancer la bande d'un mouvement continu par un rouleau de friction
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
B65H 23/26 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal par barres ou rouleaux transversaux fixes ou réglables
B65H 18/26 - Mécanismes de commande de la pression de contact sur le paquet de bande enroulée, p.ex. pour réguler la quantité d'air entre les couches
B29C 55/02 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles
A machine for producing coils of prestretched extendible film has a prestretching unit (10) for prestretching the film (F) and a winding unit (100) for winding the film in a coil provided with a series of rollers around which the advancing film winds partially; the winding unit comprises a winding roller (104) in pressing contact against the coil (R) of the prestretched film in winding progress; to obtain coils of constant diameter and high winding quality the final contact position is varied of the winding roller (104) against the coil (R) according to the length of the wound film and according to the required diameter of coil.
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
B65H 18/16 - Mécanismes d'enroulage des bandes dans lesquels l'énergie est appliquée à la bobine, p.ex. pour faire avancer la bande d'un mouvement continu par un rouleau de friction
B65H 18/26 - Mécanismes de commande de la pression de contact sur le paquet de bande enroulée, p.ex. pour réguler la quantité d'air entre les couches
B65H 23/26 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal par barres ou rouleaux transversaux fixes ou réglables
A machine for producing coils of prestretched extendible film has a prestretching unit (10) for prestretching the film (F) and a winding unit (100) for winding the film in a coil provided with a series of rollers around which the advancing film winds partially; the winding unit comprises a winding roller (104) in pressing contact against the coil (R) of the prestretched film in winding progress; to obtain coils of constant diameter and high winding quality the final contact position is varied of the winding roller (104) against the coil (R) according to the length of the wound film and according to the required diameter of coil.
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
B65H 23/26 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal par barres ou rouleaux transversaux fixes ou réglables
B65H 18/16 - Mécanismes d'enroulage des bandes dans lesquels l'énergie est appliquée à la bobine, p.ex. pour faire avancer la bande d'un mouvement continu par un rouleau de friction
B65H 18/26 - Mécanismes de commande de la pression de contact sur le paquet de bande enroulée, p.ex. pour réguler la quantité d'air entre les couches
7.
MACHINE FOR MANUFACTURING PRE-STRETCHED EXTENDABLE FILM ROLLS
A machine for manufacturing pre-stretched extendable film rolls provides for a pre- stretch unit (10) of the film (F) and a wrapping unit (100) of the film in roll provided with a series of rolls around which the advancing film is partially wrapped; the pre- stretch unit (10) provides for, in sequence, at least a first pre-stretching roll (12), a pre-stretching auxiliary roll (13) acting against the first roll (12) with the interposition of the film, and a second pre-stretching roll (14) having a speed greater than the speed of the first roll (12) to carry out the pre-stretching of the film; the wrapping unit provides for a wrapping roll (104) for wrapping the pre-stretched film; the pre-stretch unit (10) further provides for a detensioning roll (17) arranged downstream said second pre-stretching roll (14) and having a speed less than said second pre-stretching roll (14) and greater than said wrapping roll (104), so as to obtain a first detensioning of the film after the pre-stretching operation and a second detensioning of the film before the wrapping operation. A high quality pre-stretched film is obtained by this machine.
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
8.
MACHINE FOR MANUFACTURING PRE-STRETCHED EXTENDABLE FILM ROLLS
A machine for manufacturing pre-stretched extendable film rolls provides for a pre- stretch unit (10) of the film (F) and a wrapping unit (100) of the film in roll provided with a series of rolls around which the advancing film is partially wrapped; the pre- stretch unit (10) provides for, in sequence, at least a first pre- stretching roll (12), a pre-stretching auxiliary roll (13) acting against the first roll (12) with the interposition of the film, and a second pre-stretching roll (14) having a speed greater than the speed of the first roll (12) to carry out the pre-stretching of the film; the wrapping unit provides for a wrapping roll (104) for wrapping the pre-stretched film; the pre-stretch unit (10) further provides for a detensioning roll (17) arranged downstream said second pre-stretching roll (14) and having a speed less than said second pre- stretching roll (14) and greater than said wrapping roll (104), so as to obtain a first detensioning of the film after the pre-stretching operation and a second detensioning of the film before the wrapping operation. A high quality pre-stretched film is obtained by this machine.
B29C 55/06 - Façonnage par étirage, p.ex. étirage à travers une matrice; Appareils à cet effet de plaques ou de feuilles suivant un seul axe, p.ex. étirage oblique parallèle à la direction d'alimentation
B65H 23/195 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulement
9.
Spindle for winding up coreless rolls of a plastic film
A spindle (10) suitable for winding up coreless rolls (11) of a stretchable plastic film; the spindle (10) comprises a tubular body having a peripheral wall (12) defining at least one internal chamber (14) connectable to a pressurized air source. A plurality of perforations (17) extends from the internal chamber (14) of the spindle (10), through the peripheral wall (12) and a protective layer (19) of hard chrome having a sandblasted outer surface (18) with an average roughness ranging between 6 and 6.5 μm, obtained by dry sandblasting.
B65H 19/28 - Accrochage de la tête de la bande au nouveau noyau ou à la broche
B65H 75/18 - Noyaux, gabarits, supports ou pièces de tenue pour matériau bobiné, enroulé ou plié, p.ex. tourets, broches, bobines, tubes à cannette, boîtes - Détails de structure
B65H 75/10 - Genres ou types de section transversale circulaire ou polygonale sans rebords, p.ex. tubes à cannettes
B65H 19/22 - Changement de la bobine dans les mécanismes d'enroulage ou en liaison avec les opérations d'enroulage
B65H 19/30 - Levage, transport ou enlèvement de la bobine; Insertion du noyau
10.
SPINDLE FOR WINDING UP CORELESS ROLLS OF A PLASTIC FILM
A spindle (10) suitable for winding up coreless rolls (11) of a stretchable plastic film; the spindle (10) comprises a tubular body having a peripheral wall (12) defining at least one internal chamber (14) connectable to a pressurised air source. A plurality of perforations (17) extends from the internal chamber (14) of the spindle (10), through the peripheral wall (12) and a protective layer (19) of hard chromehaving a sandblastedouter surface (18) with an average roughness ranging between 6 and 6.5 µm, obtained by dry sandblasting.
A spindle (10) suitable for winding up coreless rolls (11) of a stretchable plastic film; the spindle (10) comprises a tubular body having a peripheral wall (12) defining at least one internal chamber (14) connectable to a pressurised air source. A plurality of perforations (17) extends from the internal chamber (14) of the spindle (10), through the peripheral wall (12) and a protective layer (19) of hard chromehaving a sandblastedouter surface (18) with an average roughness ranging between 6 and 6.5 µm, obtained by dry sandblasting.
A method, a mandrel (10) and a device for removing coreless rolls (15) of a plastic film. The mandrel (10) comprises a tubular body having a plurality of radial holes (17), conformed with a chamber (16) for distributing pressurised air, in which a piston (22) suitable for being magnetically coupled with an external drive member (27) slides. When a roll (15) must be removed, pressurised air is supplied to the fore end of the mandrel (10), and escapes from all the holes (17) to expand the internal turns of the roll (15) which can be taken off without friction. As the roll (15) advances along the mandrel (10), the magnetically driven piston (22) progressively reduces the volume of the air chamber (16) preventing at the same time the air to escape from the holes (17) that progressively come to lie on the rear side of the mandrel (10), with consequent saving of compressed air.
One or a plurality of coreless rolls of a stretchable plastic film are wound up on a mandrel (10) having a tubular body; the mandrel (10) comprises at least a fore air chamber (14) and a rear air chamber (15) axially aligned, wherein the periph-eral wall (11) of the mandrel (10) comprises a perforated zone (16, 17) in correspondence of each air chamber (14, 15). One or a plurality of coreless rolls (B1, B2) of stretchable plastic film are wound up on the mandrel (10) at said perforated zones (16, 17) and air chambers (14, 15); the roll or rolls (B1, B2) are removed by pushing said roll or rolls along the mandrel (10), by supplying pressurised air initially into all air chambers (14, 15) during a first removal step of the roll or the rolls (B1, B2) and selectively disconnecting each chamber (14, 15) from the pressurized air source, starting from the rear air chamber (15) to the fore air cham-ber (14) at overcoming of each air chamber (14, 15) by said roll or rolls (B1, B2).
One or a plurality of coreless rolls of a stretchable plastic film are wound up on a mandrel (10) having a tubular body; the mandrel (10) comprises at least a fore air chamber (14) and a rear air chamber (15) axially aligned, wherein the peripheral wall (11) of the mandrel (10) comprises a perforated zone (16, 17) in correspondence of each air chamber (14, 15). One or a plurality of coreless rolls (B1, B2) of stretchable plastic film are wound up on the mandrel (10) at said perforated zones (16, 17) and air chambers (14, 15); the roll or rolls (B1, B2) are removed by pushing said roll or rolls along the mandrel (10), by supplying pressurised air initially into all air chambers (14, 15) during a first removal step of the roll or the rolls (B1, B2) and selectively disconnecting each chamber (14, 15) from the pressurized air source, starting from the rear air chamber (15) to the fore air chamber (14) at overcoming of each air chamber (14, 15) by said roll or rolls (B1, B2).
A method and an apparatus f or winding careless and soft-core rolls (11), of film materials (10). The film (10) is made to advance, at differentiate speeds (S1, S2), between a first and a second drawing unit (12, 21) making the film (10) to perform a floating loop (19). The film (10) is fed in a controlled way, making it adhere to a grooved corrugating drum (22) by an air jet (29) to corrugate cross corrugations in the film (10) while it is being wound up; the corrugations of the film (10) traps air and prevents the implosion of the roll (11). A programmable electronic unit (32), controls the drawing units (12, 21) in relation to control signals (E1, E2) related to the feeding and winding up speeds (S1, S2) of the film (10), and in relation to a control signal supplied by a sensing device (28) for detecting the position of the floating loop (19).
B65H 23/18 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal en commandant ou régulant le mécanisme d'avance de la bande, p.ex. le mécanisme agissant sur la bande courante
16.
GROOVED VACUUM ROLLER SYSTEM FOR CORRUGATING AND WINDING ROLLS OF PLASTIC FILM
A method and an apparatus for corrugating and winding up rolls of a plastic film. The plastic film is corrugated as it is continuously wound onto a roll, by a film drawing drum conformed with a plurality of longitudinally extending grooves to perform open-end corrugation or folds which extend crosswise the film; the plastic film is corrugated crosswise, causing the same film to penetrate into the grooves of the drawing drum by suction of air through a plurality of suction holes which open out into the grooves of the drum.
B65H 18/26 - Mécanismes de commande de la pression de contact sur le paquet de bande enroulée, p.ex. pour réguler la quantité d'air entre les couches
B29C 59/06 - Façonnage de surface, p.ex. gaufrage; Appareils à cet effet par des moyens mécaniques, p.ex. par pressage en utilisant des tambours à vide
B31F 1/26 - Fabrication de bandes dans lesquelles le creux de chaque ondulation est perpendiculaire à l'avancement des pièces en utilisant des cylindres cannelés engrenant l'un avec l'autre
B65H 18/16 - Mécanismes d'enroulage des bandes dans lesquels l'énergie est appliquée à la bobine, p.ex. pour faire avancer la bande d'un mouvement continu par un rouleau de friction
17.
METHOD AND APPARATUS FOR WINDING AND REMOVING CORELESS ROLLS FROM A SPINDLE
A coreless roll (12) of a plastic film (10) is directly wound onto a tubular spindle (11); the spindle (11) is provided with an air chamber (11P) having a perforated side wall (11W), which communicate with a pressurised air source (27). At the removal of the roll (12), the inner turns of the roll (12) are radially expanded by feeding a pressurised airflow into the winding spindle (11) and the roll (12); the pressurised air is fed for a length of time required for the removal of the roll (12).
A method and an apparatus for winding coreless and soft-core rolls (11), of film materials (10). The film (10) is made to advance, at differentiate speeds (S1, S2), between a first and a second drawing unit (12, 21) making the film (10) to perform a floating loop (19). The film (10) is fed in a controlled way, making it adhere to a grooved embossing drum (22) by an air jet (29) to emboss cross corrugations in the film (10) while it is being wound up; the corrugations of the film (10) traps air and prevents the implosion of the roll (11). A programmable electronic unit (32), controls the drawing units (12, 21) in relation to control signals (E1, E2) related to the feeding and winding up speeds (S1, S2) of the film (10), and in relation to a control signal supplied by a sensing device (28) for detecting the position of the floating loop (19).
B65H 18/16 - Mécanismes d'enroulage des bandes dans lesquels l'énergie est appliquée à la bobine, p.ex. pour faire avancer la bande d'un mouvement continu par un rouleau de friction
B29C 59/04 - Façonnage de surface, p.ex. gaufrage; Appareils à cet effet par des moyens mécaniques, p.ex. par pressage en utilisant des rouleaux ou des courroies sans fin
B65H 20/24 - Progression des bandes par des dispositifs à boucles ou similaires
B65H 23/04 - Positionnement, tension, suppression des à-coups ou guidage des bandes longitudinal