Inflation and sealing device with inclined components
View Patent ↗The present disclosure is related to an inflation and sealing device that can include a material support at an angle to a guide for an inflation and sealing mechanism. The device can have a material support with a discontinuous surface. The device may also have low- or non-stick surfaces and bump-off elements to prevent sticking to a cooling region or exit from the device.
1. A web inflation device comprising:
a plurality of film handling elements that have film supporting portions that support and direct an inflatable web of film in a longitudinal direction along a path, wherein the plurality of film handling elements includes:
a supply support element that supports a supply of the web in an uninflated state;
an inflation mechanism comprising a nozzle operable to inflate the web with a fluid by directing the fluid between superimposed plies of the web; and
a sealing mechanism operable to seal the plies together to seal the fluid therein;
wherein angled two of the film supporting portions are disposed upstream of the nozzle and extend in non-parallel directions transverse to the longitudinal direction to cause an increased tautness in the web at the nozzle compared to a lesser tautness in a region of the web spaced transversely from the nozzle at a same longitudinal location along the path.
2. The device of claim 1 , wherein the transverse directions in which the two film supporting portions extend are inclined with respect to each other measured rotationally about the longitudinal direction to cause the difference in tautness.
3. The device of claim 1 , wherein:
the plurality of film handling elements includes a guide member disposed along the path between the supply support element and the inflation mechanism; and
each of the two angled film supporting portions are provided by a respective one of the supply support element and the guide member, such that the web travelling along the path is tauter at one transverse end of the guide member than the other.
4. The device of claim 3 , wherein:
the supply support element comprises a spindle that supports a web arranged in a roll, the spindle having a spindle axis;
the guide member has a film contacting surface that contacts and guides the film along the longitudinal direction of the path; and
the spindle axis and the film contacting surface are nonparallel in the transverse direction inclined with respect to each other as measured about the longitudinal direction.
5. The device of claim 4 , wherein the nozzle extends longitudinally along the path for reception in an inflation channel between the plies, wherein the guide member is disposed between the supply support element and the nozzle and inclined with respect to the spindle axis to increase tautness in the web upstream of the nozzle for smoothing the transition of the web onto the nozzle.
6. The device of claim 5 , wherein the guide member is positioned to produce a bend in the longitudinal direction of the path, the spindle axis being inclined with respect to the guide member to define a deeper bend at a first transverse location closer to the nozzle than at second transverse location farther away from the nozzle at the same longitudinal location of the film.
7. The device of claim 1 , wherein the angled two of the film supporting portions are provided by respective ones of the two film handling elements disposed immediately upstream of the nozzle.
8. The device of claim 1 , wherein one of the angled two film supporting portions is provided by the supply support element and the other one of the angle two film supporting portions is provided by a second film handling element, and wherein the supply support element and the second film handling element are arranged relative to one another such that an angle defined between a portion of the web upstream of the second film handling element and a portion of the web downstream of the film handling element increases as the web is depleted from the supply of inflatable web.
9. A web inflation device comprising:
a plurality of film handling elements that have film supporting portions that support and direct an inflatable web of film in a longitudinal direction along a path, the film handling elements including:
a supply support element that supports a supply of the web in an uninflated state;
an inflation mechanism that includes a nozzle operable to inflate the web with a fluid by directing the fluid between superimposed plies of the web;
a sealing mechanism operable to seal the plies together to seal the fluid therein; and
a guide member disposed along the path between the supply support element and the nozzle, wherein the guide member has first and second portions disposed at respective first and second transverse locations transversely spaced from each other, with the first transverse location nearer to the nozzle than the second transverse location;
wherein the guide member and the supply support element are positioned relative to one another to define a bend in the path extending around the guide member, wherein the bend defined around the first portion is deeper than the bend defined around the second portion to increase tautness of the web downstream of the first portion compared to the web downstream of the second portion.
10. The device of claim 9 , wherein the supply support element, the inflation assembly, and the sealing assembly are all positioned relative to one another to define a circuitous path to be traversed by the web.
11. The device of claim 9 , wherein the path includes a plurality of direction changes for the web when traversing the path with each direction change of the plurality of direction changes being characterized by at least one curve that describes the direction change and by a transversely extending central axis defined by geometry of the at least one curve, wherein at least one or more of the central axes include a non-parallel direction with respect to the supply support element.
12. The device of claim 9 , wherein an angle between axes of the guide element and the support element is from about 10° to about 45°.
13. The device of claim 9 , wherein the supply support element is a rotatable spindle.
14. The device of claim 9 , wherein the supply support element is axially connected to a brake that resists rotation of the supply support element.
15. The device of claim 14 , wherein the brake is a motor that controls rotation of the supply support element thereby controlling tension in web as the web traverses the path.
16. The device of claim 9 , wherein the guide member and the supply support element are inclined at different angles selected to cause the difference in depth of the bends around the first and second portions.