Abstract: The disclosed device comprises a roller, rotatably mounted on a pivotable arm, for maintaining rolling contact with the edges of sheets being adhesively laminated. One of the sheets is rather stiff board and the other a thin gauge sheet covering one side of the board. As the laminated sheets advance the roller, which is in pressure engagement with the edges of the board parallel to the direction of movement, moves laterally inwardly to also provide rolling contact with the lateral trailing edge of the board. In doing so the corners of the thin wrap are pressed tightly against the edges of the board to produce well defined corners.

Abstract: A wrapping machine of the horizontal form, fill and seal type, in which a continuously moving web strip is formed into a tube of thermoplastic material, has introduced therein a file of longitudinally spaced articles. A transverse sealing and cutting mechanism, coordinated with the lengths of each article and with the velocity of the tube, seals and cuts the web between articles to produce individually wrapped articles. To conserve wrapping material and to produce a wrinkle-free tight wrap, there is disclosed tucking devices, cooperating with the sealing and cutting mechanism, which, in addition to tucking, creates smooth well-defined folds at the ends of each package. More particularly, the tucking devices are in one embodiment, rotated about axes located on either side of the web tube path with the speed of rotation being such that the tucking devices closely approximate the speed of the web since tucking occurs during web movement.

Abstract: This application discloses an apparatus for preventing heat damage to thermoplastic web material being converted to produce bags. After a selected number of bags have been made, the web feeding rolls are automatically stopped for a short period, which may be for one or more machine cycles or stopped for an indeterminate period on command of the operator, to allow removal or transfer of a completed stack of bags. When web movement is stopped, the web feeding rolls that are driven by a belt, are rotated in a direction opposite to the feed direction to withdraw the leading edge of the web from the plane in which the heated seal bar reciprocates. Withdrawing of the web occurs by applying additional tension to that reach of the belt which will effect reverse rotation of the feeding rolls. Such additional tension is created by freely rotating pulleys mounted on a plate oscillated by an actuator.

Abstract: This application discloses an improved device for reducing the velocity at which thermoplastic bags, as they are produced by a bag machine, are directed to a table, or other suitable support, for accumulation in even-edged stacks.