A suction roll (1) of a laminar product comprises a fixed tubular body (10) provided with an external lateral surface (11) and of an internal lateral surface (12) delimiting a longitudinal suction chamber (16). A rotating tubular body (20) is, furthermore, provided mounted coaxially to the fixed tubular body (10) to rotate about a longitudinal rotation axis (120). The rotating tubular body (20) is provided with at least a first and a second plurality of suction channels (23,24) organized in a respective predetermined number of longitudinal rows (3,4). A device for generating an air-flow (50) is, furthermore, provided for generating an air-flow at a determined pressure in the longitudinal suction chamber (16). The fixed tubular body (10) is provided with a first and a second plurality of circumferential apertures (15a, 15b) distributed, respectively, along a first and a second longitudinal direction (13,14). Each circumferential aperture (15a, 15b) is positioned along a respective circumferential portion of the fixed tubular body (10) to put, respectively, in pneumatic connection the longitudinal suction chamber (16) with at least a row (23, 24) of the first and of the second plurality of suction channels (23, 24), at predetermined angular positions of the rotating tubular body (20).
A suction roll (1) of laminar products (5) comprises a fixed tubular body (10) having an external lateral surface (11) and an internal lateral surface (12) which communicates with each other through at least a first plurality of circumferential apertures (15a). The internal lateral surface (12) delimits a longitudinal suction chamber (16). A rotating tubular body (20) is, furthermore, provided mounted coaxially to the fixed tubular body (10) having an external lateral surface (21) and an internal lateral surface (22). The rotating tubular body (20) rotates about a longitudinal axis (120) and is provided with at least a first plurality of suction channels (23) organized according to a predetermined number of longitudinal rows (3). The rotation of the rotating tubular body (20) puts in pneumatic connection the longitudinal suction chamber (16) with at least a row (23) of suction channels (23) at respective angular position. A device for generating an air-flow (50) selected among : a compressor, a centrifugal compressor, a fan, a centrifugal fan, is, furthermore, provided that is pneumatically connected to the longitudinal suction chamber (16) in order to cause a worked laminar product (5), at a time, to be sucked by at least one row of suction channels (23) and to adhere to the external lateral surface (21) of the rotating tubular body (20) at the aforementioned different angular positions.
A suction roll (1) of a laminar product (5) fed along an advancing direction in a paper converting machine comprises at least a suction chamber (16) defined internally to the suction roll (1) and pneumatically connected to a device for generating an air-flow (50). The roll, furthermore, comprises a rotating tubular body (20) provided with an external lateral surface (21) and a plurality of suction channels (23) organized according to a predetermined number of longitudinal rows (3) to put in pneumatic connection said external lateral surface (21) with the suction chamber (16). A suction distribution device (40) is, furthermore, provided for, selectively, putting in pneumatic connection the or each suction chamber (16) with at least a longitudinal row (3) of suction channels (23) at predetermined angular positions of said rotating tubular body (20) to cause the worked laminar product (5) to be sucked and to adhere at a corresponding portion of the external lateral surface (21). At least a suction channel (23) of at least a longitudinal row (3) of suction channels (23), at the external lateral surface (21) of the rotating tubular body (20), has a suction surface area greater than 20 mm2.
A suction roll (1) for sucking a laminar product (5) fed along an advancing direction in a paper converting machine comprises a rotating tubular body (20) which rotates about a longitudinal rotation axis (120) and is provided with an external lateral surface (21) and with an internal lateral surface (22) in pneumatic connection with each other through a plurality of suction channels (23) organized according to a predetermined number of longitudinal rows (3). A suction chamber (16) is, furthermore, provided pneumatically connected to a device for generating an air-flow (50) and to a suction distribution device (40) which selectively puts in communication the suction chamber (16) with at least one longitudinal row (3) of suction channels (23) at predetermined angular positions of the rotating tubular body (20) to cause the worked laminar product (5) to be sucked and to adhere to a corresponding portion of the external lateral surface (21) of the rotating tubular body (20). The suction channels (23), at the external lateral surface (21) of the rotating tubular body (20), has a suction surface area greater than 1 mm2 for each mm of length.
B65H 5/22 - Feeding articles separated from pilesFeeding articles to machines by air-blast or suction device
B65H 29/24 - Delivering or advancing articles from machinesAdvancing articles to or into piles by air-blast or suction apparatus
B65H 45/24 - Interfolding sheets, e.g. cigarette or toilet papers
5.
MACHINE FOR PRODUCING LAMINAR PRODUCTS MADE OF PAPER MATERIAL, IN PARTICULAR PACKAGES OF NAPKINS, TISSUES OR SIMILAR PRODUCTS AND RELATED PRODUCTION METHOD
A machine (1) for producing packages of napkins, tissues, towels, or similar products, comprises a support frame (100) to support a feeding group (10) which feeds a first and a second web of paper (5a, 5b). The support frame (100) supports, furthermore, a cutting group (20) which cuts the first and second webs of paper (5a, 5b) respectively in a first and a second plurality of sheets (6) of predetermined length, and a folding or interfolding group (30) which folds or interfolds the sheets of paper (6) at a folding or interfolding zone, (35) in such a way to obtain a stack (150) of folded or interfolded sheets, according to a predetermined folding or interfolding configuration. The cutting group (20) and the folding or interfolding group (30) are mounted on the same support body (110) to move between an assembled position in which is supported by the support frame (100), and a disassembled position, in which is not supported by the support frame (100). A displacement group (50) is, furthermore, provided to displace the support body (110) between the assembled position and the disassembled position. The displacement group (50) and the support body (110) are provided with respective engagement portions (58,118) to engage with each other in such a way to allow the displacement group (50) to displace the support body (110) between the assembled position and the disassembled position
B65H 45/24 - Interfolding sheets, e.g. cigarette or toilet papers
B65H 23/04 - Registering, tensioning, smoothing, or guiding webs longitudinally
B65H 23/182 - Registering, tensioning, smoothing, or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in unwinding mechanisms or in connection with unwinding operations
B65H 27/00 - Special constructions, e.g. surface features, of feed or guide rollers for webs
B65H 35/00 - Delivering articles from cutting or line-perforating machinesArticle or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
A machine (1) for producing stacks of laminar products made of paper material, in particular stacks of napkins, comprises a feeding section (10) to feed a plurality of continuous webs of paper (2a,2b) along respective predetermined feeding directions (102a,102b). The machine (1) comprises, furthermore, a first folding section (20) equipped with a plurality of folding members (21a,21b) each of which configured to fold a respective continuous web of paper (2a,2b) per obtain a respective folded web of paper (2'a,2'b) provided with at least a first folding line (6) longitudinal to the respective continuous web of paper (2a,2b). A cutting section (30) is, furthermore, provided equipped with at least a cutting blade (35) configured to work in combination with a counter-cutting blade (36) in such a way to cut at a cutting point (P1) each folded continuous web of paper (2'a,2'b) into a respective plurality of sheets of paper (4a,4b) folded along the first folding line (6). Downstream of the cutting section (30) a second folding section (40) is provided for further folding each folded sheet of paper and obtaining a respective folded laminar product (5a,5b). The first folding roll (41) puts, then, a folded laminar product of paper (5) on a forming table (50) forming a stack (100) comprising a plurality of folded laminar products.
B65H 45/22 - Longitudinal folders, i.e. for folding moving sheet material parallel to the direction of movement
B65H 31/10 - Pile receivers with movable end support arranged to recede as pile accumulates the articles being piled one above another and applied at the top of the pile
B65H 31/30 - Arrangements for removing completed piles
Folding or interfolding machine (100) for forming stacks (50) of a predetermined number of sheets (5) comprising a first and a second folding or interfolding roll (la, lb), arranged to rotate about respective rotation axes (101a, 101b) to fold or interfold the sheets (5) according to a predetermined folding or interfolding configuration, obtaining a forming stack of folded or interfolded sheets (50) which grows in height along a predetermined forming direction (150). A separation group (20) is, furthermore, provided for separating a finished stack (50' ) from a following forming stack of sheets (50). A transfer group (30) is also provided for transferring the finished stack (50' ) of folded or interf olded sheets towards a discharge zone (60). At least one between the separation group (20) and the transfer group (30) comprises at least a detection device (40) for detecting the force exerted by the forming stack, or by the finished stack (50,50' ) on the separation group (20), or on the transfer group (30).
B65H 45/24 - Interfolding sheets, e.g. cigarette or toilet papers
B65H 31/30 - Arrangements for removing completed piles
B65H 43/04 - Use of control, checking, or safety devices, e.g. automatic devices comprising an element for sensing a variable detecting, or responding to, presence of faulty articles
B65H 31/32 - Auxiliary devices for receiving articles during removal of a completed pile
An interfolding machine produces interfolded sheets according to an interfolding configuration and, starting from a web of paper provides a feeding section, which applies a tension on the web and moves the same along a feeding direction feeding the same to a cutting section, in which the web of paper is cut into a series of sheets at a cutting point between a cutting roller and a counter-cutting element. Downstream of the cutting section, a folding section includes a first and a second folding rollers counter-rotating with respect to each other. The first and second folding rollers rotate about respective rotation axes with a first peripheral velocity vP, and fold, at a folding zone, a plurality of sheets in a plurality of panels and form the stack of interfolded sheets. The cutting roller alternately distributes the aforementioned sheets between a transfer roller and the first folding roller.
patents
