摘要:
The invention describes a machine (10) for producing bags of flexible material, comprising a reel-holder group (12) that removably supports at least one reel (14, 16) capable of supplying at least one said flexible material, a welding group (18) provided with at least one upper welding plate (20) and at least one corresponding lower welding plate (22) that are heated and provided with corresponding linear welding tracks, such upper (20) and lower (22) welding plates acting on the film according to a vertical alternate movement, pinching it along one or more linear portions, and at least one cutting group (24, 26) that separates from each other the single bags that have just been obtained further to the welding operation on the film. The lower welding plate (22) is made integral with a base (30), whereas the upper welding plate (20) is mobile with an alternate motion along a plurality of vertical guiding columns (32) and is constrained at the top to a plurality of moving means (36, 38) associated with a cover (40) fixed above such vertical guiding columns (32). Each single moving means (36, 38) is controlled by a respective motor (42) integral with the cover (40).
摘要:
An instantaneously controlled feeding calender in welding machines for plastic materials, comprising an upper feeding cylinder (12) and a lower feeding cylinder (13) superimposed on each other and mounted on parallel axles, between which a plastic or thermoplastic film (14) is fed so as to form a bag or similar, a welding group downstream of the cylinders (12, 13) comprising an upper welding arm (15) and a lower welding arm (16), and a collecting area (18, 20, 21, 22) for finished bags (19), where each cylinder (12, 13) is equipped with an independent motor (27, 28).
摘要:
A feeding unit for plastic material or the like in a welding machine, in particular adapted to promote a high-speed operation, of the type comprising a pair of upper (12) and lower (13) feeding rollers, superimposed to one another and provided with transversal slots or grooves (14, 15) that are staggered between the upper roller (12) and the lower roller (13), there being provided a blower unit above and below a plastic feeding material (11), wherein the blower unit comprises air feeding upper (16) and lower (17) nozzles, exiting from a respective header (18, 19), arranged downstream of said upper roller (12) and lower roller (13) and adapted to favour the flat laying of the fed material (11) passing into the rollers (12, 13). In particular, upstream of the rollers (12, 13) there are provided transversal supports (20, 21) for guiding lattens (22, 23) that insert into the slots (14, 15).
摘要:
A method for fabricating a bag with a flat bottom comprises: making a flattened tubular element (12) with lateral bellows (13); obtaining a quadrilateral bottom of a single piece (15), folding the bottom in a single piece to identify two opposite bellows, inserting the bottom (16) thus folded into the flattened tubular element (12), bringing the two opposite bellows (20) of the bottom so that they are astride of the lateral bellows (13) of the flattened tubular element (12); and welding the ends facing outwards of the flattened tubular element to the outer sides (18) of the bottom (16) and to the inner edges of the two opposite bellows obtained in the bottom.
摘要:
A device for the proper and free stacking of welded bags in a welding machine (11), wherein the welding machine comprises at least a pair of opposed rolls (13) which feed a plastic tubular material (12), an upper welding device (15) and a lower welding device (16) which cooperate to execute the transverse welding of the plastic tubular material (12), a support (20) for stacking the welded bags (21) as they come out from the two welding devices (15, 16), said support (20) is positioned downstream of the welding devices and it carries needles (22) on which the bags (21, 21') are steadily positioned by means of a small upper press (23), said device comprises a driven transverse displacement element (25) which acts on the single bag (21') to be welded, and causes the backing of one of the free front end (27) of the bag, said displacement element (25) is positioned between the two welding devices (15, 16) and the support (20) and it acts every second bag, in order to displace one bag from the next one (21, 21').
摘要:
An improved performance welding bar placed in a welding machine for the welding of thermoplastic material of low and high density, suitable for both the lower welding bar (11) and the upper welding bar (12) among which bars (11, 12) the material is moved along by at least one pair of lower (14) and upper (15) supply rollers, placed on top of each other, the two welding bars (11, 12) moved backwards and forwards between themselves by a control group (20), wherein each welding bar (11, 12) is made from a magnesium-zinc aluminum alloy, within which the percentage of zinc to be found is between 5.0-6.5% and the percentage of magnesium to be found is between 2.0-3.0%. According to the invention the use of a magnesium zinc aluminum alloy is provided for, for a welding bar in a welding machine of thermoplastic material, wherein the bar is continually activated by a forward and/or backward movement with regards to a second similar welding bar.
摘要:
An improved performance welding bar placed in a welding machine for the welding of thermoplastic material of low and high density, suitable for both the lower welding bar (11) and the upper welding bar (12) among which bars (11, 12) the material is moved along by at least one pair of lower (14) and upper (15) supply rollers, placed on top of each other, the two welding bars (11, 12) moved backwards and forwards between themselves by a control group (20), wherein each welding bar (11, 12) is made from a magnesium-zinc aluminum alloy, within which the percentage of zinc to be found is between 5.0-6.5% and the percentage of magnesium to be found is between 2.0-3.0%. According to the invention the use of a magnesium zinc aluminum alloy is provided for, for a welding bar in a welding machine of thermoplastic material, wherein the bar is continually activated by a forward and/or backward movement with regards to a second similar welding bar.
摘要:
An instantaneously controlled feeding calender in welding machines for plastic materials, comprising an upper feeding cylinder (12) and a lower feeding cylinder (13) superimposed on each other and mounted on parallel axles, between which a plastic or thermoplastic film (14) is fed so as to form a bag or similar, a welding group downstream of the cylinders (12, 13) comprising an upper welding arm (15) and a lower welding arm (16), and a collecting area (18, 20, 21, 22) for finished bags (19), where each cylinder (12, 13) is equipped with an independent motor (27, 28).