摘要:
A method for forming a geomembrane liner testable for leaks by securing adjacent panels together with the conductivity of the lower surface of an overlying panel broken along a line adjacent the panel overlapping edge, and the overlapping edges sealed along the line. A heat welder has slots for the overlapping panel edges, with a heated wedge between the slots and having a projection to break the conductivity of the overlying panel bottom surface as it passes the wedge. The slots merge to press the liner edges together to heat weld them along the line of broken conductivity as the welder is moved along the panel edges.
摘要:
A sealing apparatus 200 for sealing together two film portions 202, 204 may include a heating element 206 positioned in relation to a pair of nip pressure devices 208, 210 for creating a seal 311 between the two film portions 202, 204 and trimming the two film portions 202, 204 at the created seal. A controller 214 is connected to the heating element 206 and is for connection to a power source for applying a variable amount of power to the heating element 206. The amount of power varies based on at least a speed of the two film portions 202, 204 passing the heating element 206.
摘要:
The problems associated with the prior art have been overcome by the present invention, which describes a tubular heating element having a more reliable and accurate temperature monitoring system. The tubular heating element has a thermocouple attached to its exterior surface, in close proximity to the cutting and sealing portion of the tubular heating element. In addition to improving the accuracy of the temperature measurement, this technique reduces electromagnetic interference caused by the interaction between the heating wire and the thermocouple.
摘要:
A tubular heating element which is resistant to damage caused by foreign material is disclosed. The tubular heating element is pivotably attached to the side sealing machine at its leading (upstream) edge. The trailing (downstream) edge of the tubular heating element is moved by means of a compressible force, such as an air cylinder. In this way, the air in the cylinder pushes the tubular heating element downward into the plane of the film. However, a foreign object located on the film can overcome the force of the air cylinder, thereby lifting the tubular heating element out of the path of the film.
摘要:
A side sealing apparatus for a shrink packaging machine comprising closed loop temperature control of a heater for maintaining an optimum temperature for cutting and sealing two layers of thermoplastic film. The heater comprises a cable or cartridge heater with an internal thermocouple, and it is connected to an automatic temperature controller. The heater is mounted on the side sealer apparatus between two sets of top and bottom V-belts mounted around drive rolls and idler rolls. The V-belts provide nip pressure against the film in order to drive the film. Nip pressure is generated by nip rolls on the scrap side of the film, and by belt support plates on the package side of the film.
摘要:
A side sealing apparatus for a shrink packaging machine comprising closed loop temperature control of a heater for maintaining an optimum temperature for cutting and sealing two layers of thermoplastic film. The heater comprises a cable or cartridge heater with an internal thermocouple, and it is connected to an automatic temperature controller. The heater is mounted on the side sealer apparatus between two sets of top and bottom V-belts mounted around drive rolls and idler rolls. The V-belts provide nip pressure against the film in order to drive the film. In one embodiment, nip pressure is generated by nip rollers on the scrap side of the film, and by low friction belt support guides on the package side of the film. In another embodiment, the belt support guides are replaced with a series of upper and lower nip rollers, and adjustable toggle clamps provide adjustable pressure on the series of upper and lower nip rollers.
摘要:
The object of this invention is to provide an automatic package machine comprises a roll of wrapping film, a film opener for opening the film, which is drawn from the roll, into such a shape that the film can wrap an article to be wrapped, a conveyer for introducing the article, which is to be wrapped, into the opening of the film opened by the film opener, and a sealing unit situated contiguously to a downstream end of the conveyer for sealing edge portions of the film opening. The sealing unit includes a heater body, a fusing and sealing blade projecting from one end of the heater body, being vertically adjustable solely or together with the heater body, and being penetrable into the edge portions of the film opening parallel to a travelling path of the film, and two pairs of upper and lower feed rollers situated upstream and downstream, respectively, of the fusing and sealing blade. The fusing and sealing blade has along at least its upstream side edge a cutting edge.
摘要:
A method of forming a severable compartmented T-shirt bag comprising heat welding overlying lengths of a flattened tubular web of thermoplastic material centrally therealong to define a compartment to each side of the heat welding and a side edge seam for each compartment, slitting the web material between the compartments and formed seams, and reengaging the seams and forming a tack joinder therebetween to define a line of severance. The method also including the steps of transversely seaming the lengths of web material into individual bag units and forming a central cutout area in each bag unit to define a bag mouth with a handle to each side of the severance line.
摘要:
A method and apparatus for slit sealing thermoplastic materials, primarily linear low density polyethylene, either alone or with coextrusions of other materials. The material is passed over a presealing roll, and the area to be slit is presealed using heated air. Very quickly after the presealing, the material is slit with a heated knife blade, the slit edges being sealed by dragging along the sides of the heated blade. The cutting edge of the blade is angled to roll a bead upwardly on the material, and the slit edges are held taut and separated by an edge holding device.
摘要:
Apparatus for stacking and conveying sheet-like sections includes a plurality of conveyor belts arranged to move a stack of such sections from a stacking station adjacent to a machine which makes the sections to a delivery station. A carriage is provided which is movable in a direction parallel to the direction of motion of the conveyor belts. After a desired number of sections are stacked, pressing apparatus mounted on the carriage compresses the stack of sections to hold it in a stable configuration against at least one of the conveyor belts. The belt drive is then activated causing the stack, the pressing apparatus and the carriage to move with the conveyor belts. A projection on the carriage is arranged to activate a switch which stops the belt drive when the stack has reached a desired delivery station. The pressing apparatus is then released and a pneumatic piston returns the carriage to the stacking station.