Method and apparatus for manufacture of pad-stacked bags
OwnerHans Lehmacherinventor
Life of this patent
Estimating the term…
Abstract
Sections successively severed from a double layer web of synthetic thermoplastic film, e.g., flattened tube stock, as produced are each stacked and welded to a precedingly stacked section near one edge of a tear off pat or hanger portion to which a bag portion of the section is attached; forming ultimately a pad of bag sections, wherein each section includes either a completed bag or a partially completed bag, in the latter case with final bag producing operations carried out simultaneously for all bags already welded together in a pad structure.
Claims40
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened film tube as a longitudinally advanced, continuous web comprising two layers of said film;
- feeding said web longitudinally downwardly vertically to a welding device acting in a horizontal plane;
- severing from said web sections corresponding to respective bags;
- stacking the severed sections successively into a pad stack;
- and
- stack welding each section to the preceding section as it is added to the stack
- with the sections being welded at, or in the region of, respective like edges;
- the stacking and welding of the bag sections to the stack being carried out at said device with a substantially vertical disposition of the bag sections.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened film tube as a longitudinally advanced, continuous web comprising two layers of said film;
- feeding said web longitudinally downwardly vertically to a welding device acting in a horizontal plane;
- severing from said web sections corresponding to respective bags;
- stacking the severed sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack;
- the stacking and welding of the bag sections to the stack being carried out at said device with a substantially vertical disposition of the bag sections.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a wide flattened thermoplastic synthetic plastic film tube longitudinally advanced as a continuous web comprising two layers of said film;
- making simultaneously a transverse perforation line in one film layer extending over the entire tube width repeatedly at spacings equal to the desired length of a bag with a suspension portion, and
- in the other layer, at a location coincident with each said transverse line, alternating aligned lengths of perforations and of severing cuts with lengths of perforations present in the edge marginal regions of the tube;
- thereafter sub-dividing the tube into a plurality of narrower individual tube portions by longitudinal severing welds, made perpendicular to and in the middle region of non-marginal lengths of the said perforations;
- thereafter severing the said individual tube portions into individual sections corresponding to respective bags with bottom seam welding, by a transversely running severing weld made at a spacing from the transverse line of perforations and severing cuts corresponding to a height of a desired bag suspension portion,
- whereby each section contains a bag portion and bag suspension portion;
- prior to the said sub-dividing of the tube, punching pad hanger holes through both layers of the tube along a line spaced from said location to fall within a respective bag suspension portion;
- stacking the severed sections successively into a pad stack;
- and
- stack welding each section to the preceding section as it is added to the stack
- by a linear stack weld made at an edge of said suspension portion and extending over the entire width of the section.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened thermoplastic film tube, longitudinally advanced, as a continuous web comprising two layers of said film;
- making repeatedly a web-separation perforation line transversely to, and penetrating through both film layers of, the tube;
- along a line associated in close spacing behind each said perforation line, transversely seam-welding through both tube film layers,
- the spacing of each pair of associated lines from the preceding associated pair corresponding to the length of bag sections to be produced;
- separating, from said web, sections corresponding to respective bags;
- defining in each section, at least in part by perforations through the web, a bag suspension portion and a bag portion attached to and separable from the suspension portion at the said perforations;
- stacking the separated sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack,
- the said stack-welding of each individual bag section into the bag pad being carried out by a continuous linear weld penetrating both film layers in the suspension portion and extending over the entire width of the section.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened thermoplastic film tube longitudinally advanced, as a continuous web comprising two layers of said film;
- making through both tube film layers repeatedly along the web
- a first transverse perforation line as a line of bag tear-off from the pad and for the bag mouth, repeated at spacings along the web equal to the desired length of a bag with a suspension portion,
- a second perforation line as a web separation perforation line paired with the first in a spacing which corresponds to the height of a bag suspension portion, and,
- in close spacing behind the separation perforation line, a transverse bottom seam-welding through both film layers, with the paired perforation lines made at a spacing from a preceding transverse seam-welding which corresponds to the length of the bag to be produced;
- separating, from said web, sections corresponding to respective bags;
- stacking the separated sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack by a continuous linear weld extending over substantially the full width of the section and penetrating both film layers.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened film tube having longitudinal side infolds, longitudinally advanced, as a continuous web comprising two layers of said film;
- defining in each of successive like web sections, at least in part by perforations through the web, a bag suspension portion and a bag portion attached to and separable from the suspension portion at the perforations;
- making, for each section, transversely aligned welds of limited lengths, in from both tube edges and perpendicularly thereto, and in the bag portion adjacent the bag suspension portion, through the four film layers present at the side infolded margins of the tube;
- severing, from said web, sections corresponding to respective bags;
- stacking the severed sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack,
- the stack-welding of the individual bag sections into a bag pad being made by linear welds penetrating all film layers in the suspension portion in the region near to the transverse welds of limited lengths.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened film tube, longitudinally advanced, as a continuous web comprising two layers of said film;
- transversely severing, from the web, sections corresponding to respective bags and
- each comprising a bag portion with length extending longitudinally of the tube end of the respective section, the section lengths each comprising a bag portion and a bag suspension portion;
- prior to the separation of each respective bag section from the web, in successive spacings corresponding to the length of the bag with the suspension portion, making in the tube a transverse bag tear off perforation line and forwardly adjacent thereto a seaming transverse weld of the said layers;
- each successive section being severed from the web at a location spaced behind a respective transverse perforation line at a distance equal to the height of, and thereby defining the suspension portion of, the section;
- stacking the severed sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack;
- said stack welding being effected by a continuous linear weld penetrating both film layers in the suspension portion of each section and extending over the entire width of the section.
A method for manufacture, from thermoplastic synthetic plastic film, of bags such as carrying bags or the like packaging stacked and connected with one another through welding into a tear-off type pad, comprising the steps of:
- providing a flattened film tube as a longitudinally advanced, continuous web comprising two layers of said film;
- feeding said web longitudinally to a welding device;
- severing, from said web, sections corresponding to respective bags;
- stacking the severed sections successively into a pad stack;
- and
- stack-welding each section to the preceding section as it is added to the stack
- with the sections being welded at, or in the region of, respective like edges,
- the stack-welding of each bag section to the stack being effected by a continuous linear weld extending over the major part of the full width of, and penetrating both film layers of, each bag section.
Dependencies are inferred from the claim text.