Laminating apparatus and method

Claim 5

The method of claim 1 further comprising varying the feed velocity of the web relative to the peripheral velocity of the drum means to vary the spacing of the strips on the web.

Claim 6

Apparatus for applying strips of flexible material in spaced apart relationship onto a moving web comprising a rotatably mounted drum having means for releasably retaining said strips thereon, movable cutting means for intermittently contacting said drum and cutting such strips from a parent sheet thereof, means for continuously rotating said drum and moving said cutting means, the spacing between the center lines of adjacent strips on the drum being determined by the intermittent contacting of said cutting means on said drum, means for feeding said parent sheet to said drum at such relative velocity to the cutting means as to determine the arcuate length of said strips on said drum, pressure applying mechanism for intermittently pinching said web against said drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, and means for feeding said web between said drum and said pressure applying mechanism to effect transfer of successive strips onto said web during the intervals of said intermittent pinchings.

Claim 7

Apparatus for applying strips of flexible material in spaced apart relationship onto a moving web comprising a rotatably mounted drum having means for releasably retaining said strips thereon, movable cutting means for intermittently contacting said drum and cutting such strips from a parent sheet thereof, means for continuously rotating said drum and moving said cutting means, the spacing between the center lines of adjacent strips on the drum being determined by the intermittent contacting of said cutting means on said drum, means for feeding said parent sheet to said drum at such relative velocity to the cutting means as to determine the arcuate length of said strips on said drum, pressure applying mechanism for intermittently pinching said web against said drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, and means for feeding said web between said drum and said pressure applying mechanism to effect transfer of successive strips onto said web during the intervals of said intermittent pinchings.

Claim 8

The apparatus of claim 3 wherein the pressure applying mechanism includes a freely rotatable pinch roll engageable with the web and having a peripheral velocity substantially the same as the peripheral velocity of the drum when the roll is in pinching engagement with the web, means is provided to alter the relative velocity between said web and the peripheral velocity of the drum to vary the spacing of strips on the web which results in stress being imposed on the web, said non-driving engagement of the web with the drum intermittently relieving such stress.

Claim 9

The apparatus of claim 4 wherein such stress relieving means comprises flats on the drum between spaced apart arcuate portions to provide dwell periods allowing the web to return to a neutral position after pinching thereof.

Claim 10

The apparatus of claim 4 wherein the stress relieving means comprises means for intermittently moving the pinch roll into and out of engagement with the drum to provide dwell periods allowing the web to return to a neutral position after pinching thereof.

Claim 11

The apparatus of claim 4 wherein such stress relieving means includes yieldable drive means for feeding the web between said drum and said pressure applying mechanism which will yield when stress is applied to the web as a result of such pinching, in combination with means allowing the web to assume a neutral state after pinching thereof.

Claim 12

The combination with a bag making machine wherein bags are formed from flexible sheet material, of apparatus for applying strips of flexible material in spaced apart relationship to the sheet to form twist closures on the bags, comprising means for moving the sheet in one general direction, rotatably mounted drum having means for releasably retaining strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from parent material, mechanism for effecting spacing of the strips on the drum and securing of the same to the moving sheet in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings, and means for feeding the sheet to the bag making machine with the strips applied thereto.

Claim 13

The combination with a bag making machine wherein bags are formed from flexible sheet material, of apparatus for applying strips of flexible material in spaced apart relationship to the sheet to form twist closures on the bags, comprising means for moving the sheet in one general direction, rotatably mounted drum having means for releasably retaining strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from parent material, mechanism for effecting spacing of the strips on the drum and securing of the same to the moving sheet in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings, and means for feeding the sheet to the bag making machine with the strips applied thereto.

Claim 14

The combination with a machine for making side weld bags wherein a web of flexible material is folded along a continuous line, moved in the direction of said fold line, and severed and sealed transversely to said fold line at spaced intervals to form individual bags with mouths opposite the fold; of apparatus for applying strips of flexible material in spaced apart relationship to the web to form twist closures extending from adjacent the mouths of the bags comprising means for moving the web in unfolded condition in one general direction, a rotatable drum adjacent the unfolded web having means for releasably retaining said strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from a parent sheet thereof, mechanism for effecting spacing of the strips on said drum and securing of the same to the moving web in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings, and mechanism for longitudinally folding the web between its edges for the feeding of said folded web to said bag making machine.

Claim 15

The combination with a machine for making side weld bags wherein a web of flexible material is folded along a continuous line, moved in the direction of said fold line, and severed and sealed transversely to said fold line at spaced intervals to form individual bags with mouths opposite the fold; of apparatus for applying strips of flexible material in spaced apart relationship to the web to form twist closures extending from adjacent the mouths of the bags comprising means for moving the web in unfolded condition in one general direction, a rotatable drum adjacent the unfolded web having means for releasably retaining said strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from a parent sheet thereof, mechanism for effecting spacing of the strips on said drum and securing of the same to the moving web in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings, and mechanism for longitudinally folding the web between its edges for the feeding of said folded web to said bag making machine.

Claim 16

The combination of claim 9 wherein a rotatable drum is mounted adjacent each edge of the unfolded web, rotary means having a cuttng blade is provided for each drum, mechanism is provided for effecting spacing of the strips on each drum and securing the strips to the moving web along each edge thereof, and the mechanism for longitudinally folding the web between its edges cooperates with means changing the direction of movement of the folded web transversely of said one general direction for the feeding of said folded web to the bag making machine.

Claim 17

The combination of claim 8 wherein said apparatus for applying said strips of flexible material includes a dancer mechanism through which the web passes, and means is provided for automatically controlling operation of the apparatus from the bag making machine by pull of the web through the dancer mechanism.

Claim 18

Apparatus for making a wrapper of flexible sheet material having opposite substantially parallel edges and spaced apart strips of flexible material capable of assuMing a dead set condition when folded extending transversely with respect to at least one of said edges to provide a twist closure of the wrapper at such edge, comprising means for moving the sheet in one general direction, a rotatably mounted drum adjacent such edge of the sheet having means for releasably retaining strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from parent material, mechanism for effecting spacing of the strips on the drum and securing the same adjacent said edge of the moving sheet in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said wrapper sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings; and means for winding said sheet with the strips thereon into a roll.

Claim 19

Apparatus for making a wrapper of flexible sheet material having opposite substantially parallel edges and spaced apart strips of flexible material capable of assuMing a dead set condition when folded extending transversely with respect to at least one of said edges to provide a twist closure of the wrapper at such edge, comprising means for moving the sheet in one general direction, a rotatably mounted drum adjacent such edge of the sheet having means for releasably retaining strips thereon, rotary means having a cutting blade for contacting said drum and cutting such strips from parent material, mechanism for effecting spacing of the strips on the drum and securing the same adjacent said edge of the moving sheet in said spaced apart relationship including pressure applying means for intermittently pinching the web against the drum with intervals between such pinchings wherein the web is in non-driving engagement with the drum, means for feeding said wrapper sheet between said drum and said pressure applying means to effect transfer of successive strips onto said sheet during the intervals of said intermittent pinchings; and means for winding said sheet with the strips thereon into a roll.

Claim 20

The combination with a machine for making bottom weld bags wherein a web of flexible material in tube form in the bag making machine is moved in one generally longitudinal direction, and is severed and sealed at spaced intervals transversely to said direction of movement to form sealed bag bottoms and mouths opposite thereto; of apparatus for applying strips of material in spaced apart relationship to the web to form twist closures extending from adjacent the mouths of the bags, comprising means for feeding a parent sheet of material from which the strips are cut, means for slitting the parent sheet into a plurality of narrower bands, means for spacing the bands apart, rotatably mounted drum means having means for releasably retaining said strips thereon, rotary cutting means for contacting said drum and cutting strips from each of said bands, mechanism for effecting spacing on the drum means between successive strips cut from each band, means for feeding a web of material to said drum means, and means for effecting transfer to the web of the strips cut from the bands in lateral spaced apart relationship and with groups of such strips spaced apart longitudinally of the web, said transfer means including pressure applying mechanism for intermittently pinching the web against the drum means with intervals between such pinchings wherein the web is in non-driving engagement with the drum means.

Claim 21

The combination with a machine for making bottom weld bags wherein a web of flexible material in tube form in the bag making machine is moved in one generally longitudinal direction, and is severed and sealed at spaced intervals transversely to said direction of movement to form sealed bag bottoms and mouths opposite thereto; of apparatus for applying strips of material in spaced apart relationship to the web to form twist closures extending from adjacent the mouths of the bags, comprising means for feeding a parent sheet of material from which the strips are cut, means for slitting the parent sheet into a plurality of narrower bands, means for spacing the bands apart, rotatably mounted drum means having means for releasably retaining said strips thereon, rotary cutting means for contacting said drum and cutting strips from each of said bands, mechanism for effecting spacing on the drum means between successive strips cut from each band, means for feeding a web of material to said drum means, and means for effecting transfer to the web of the strips cut from the bands in lateral spaced apart relationship and with groups of such strips spaced apart longitudinally of the web, said transfer means including pressure applying mechanism for intermittently pinching the web against the drum means with intervals between such pinchings wherein the web is in non-driving engagement with the drum means.

Claim 22

The method of claim 1 wherein the strips are cut in elongated form from the parent sheet of material and are retained on the drum means with their lengthwise dimensions extending axially of the drum means whereby they become bonded to the web with their lengthwise dimensions extending transversely with respect to an edge of the web.

Claim 23

The method of claim 1 further comprising feeding a plurality of parent sheets in spaced apart relationship between the drum means and the cutting means, and simultaneously cutting the strips from each sheet in elongated form with their lengthwise dimensions extending transversely to the drum axis whereby they become bonded to the web with their lengthwise dimensions extending in the direction of movement of the web.