Laminar gassing rail for food packaging

Abstract

A gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising: a rail top assembly, the rail top assembly includ

Description

FIELD OF THE INVENTION The present invention relates to laminar gassing rail assembly for flushing gas during packaging process. BACKGROUND OF THE INVENTION The prior art includes a system and process of packaging food items. US Patent 6,032,438 is directed to a controlled environment gassing system for removing the existing environment from containers. US Patent 10,934,036 is directed to an apparatus and method for distributing a flushing gas. U.S. Patent No. 5,911,249 discloses a gassing rail apparatus and method. The prior art all provide laminar flow gassing rails. However, the prior art requires two long O-ring cords to seal the rail top against the rail bottom. The prior art includes two long elements consisting of a baffle and two layer element, which are very flimsy. Both items may be damages easily and require regular replacement. In addition, the gas distribution is not uniform. Rather, there is a higher concentration at the center part of the top rail. In addition, to clean the prior art gassing rail, it is necessary to remove the rail top and rail bottom from the production line, requiring additional down time. Additionally, numerous clamps are required to clamp the rail bottom to the rail top assembly in a sealing engagement. There is a need to reduce the period for maintenance, as well as reduce the maintenance time, and provide a uniform gas distribution. In addition, it is desirable for provide such a system with reduced complexity and parts, and to improve efficiency. SUMMARY OF THE INVENTION The present invention provides a gassing rail apparatus to be used in a food packaging conveyor system. The gassing rail apparatus adapted to be coupled to a gas source and includes a rail top assembly. The rail top assembly including a rail top. The rail top having an upper portion with at least one laminar flow port opening, and a lower portion includes a laminar flow channel, the laminar flow channel extends generally along a longitudinally axis, the laminar flow port opening coupled to the laminar flow channel, the longitudinal laminar flow channel is surrounded by an outer seat, the outer seat having a generally rectangular shape, a gas port coupled to the laminar flow port opening, the gas port is adapted for coupling to a gas source, a three layer element having a planar shape which extends generally along a longitudinally axis, the three layer element has an upper surface and a lower surface, the three layer element is received by the lower portion of the rail top, and a rail frame which extends along a longitudinal axis, the rail frame has an upper surface and a lower surface, at least one gas distribution slot extending along a longitudinal axis, the rail frame substantially planar with a downward depending flange extending from the at least one gas distribution slot, the rail frame is received by the outer seat. The gassing rail apparatus further includes a rail bottom located below the top rail. The rail bottom adapted to receive at least one rail top assembly. The rail bottom having at least one gas distribution opening corresponding to each rail top assembly. The at least one gas distribution opening extending along the longitudinal axis of the rail bottom, and is aligned with the laminar flow channel. The gas distribution opening receives a corresponding downward depending flange and aligns the rail top assembly and rail bottom. A stainless steel embodiment is also provided. The present invention also provides a rail bridge mounting assembly adapted to be used with the gassing rail apparatus. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gassing rail assembly supported by a C-channel in accordance with a first embodiment of the present invention. FIG. 2 is a partial exploded view of the gassing rail assembly of FIG. 1. FIG. 3 is a partial exploded view of the rail top assembly and port block of FIG. 1. FIG. 4A is a side view and FIG. 4B is a bottom view of the rail top assembly and port block of FIG. 1. FIGS. 5 shows a perspective bottom view of the rail top of FIG. 1. FIG. 6A is a top view of the rail top assembly of FIG. 1 and FIG. 6B is a cross sectional view taken along line A-A of FIG. 6A. FIG. 7 is a perspective view of a rail top assembly of a gassing rail assembly in accordance with a second embodiment of the present invention. FIG. 8 shows a partial exploded view of the rail top assembly of FIG. 7. FIG. 9A shows a top view, FIG. 9B a side view and FIG. 9C a bottom view of the rail top of FIG. 7. FIG. 10A shows a top view, FIG. 10B a side view, FIG. 10C a bottom view and FIG. 10D an end view of the port block of FIG. 7. FIG. 11A is a top view, FIG. 1 IB a side view and FIG. 1 IC is a bottom view of a three layer element and an element holder of FIG. 7. FIG. 12 is an exploded view of the three layer element and an element holder of FIG. 7. FIG. 13 is a cross section of the gassing rail assembly of FIG. 1 taken through the rail bridge, with the C-channel and mounting fixture omitted, and the rail bottom and rail top assembly modified per the embodiment of FIG. 7. FIG. 14 is a perspective view of an inverted U-shaped mount in accordance with the present invention. FIG. 15 is an exploded view of an inverted U-shaped mount in accordance with the present invention. FIG. 16 shows a bottom exploded view of a portion of an inverted U-shaped mount in accordance with the present invention. FIG. 17 shows a partial exploded view of a mounting fixture in accordance with the present invention. FIG. 18 is a cross sectional view of a mounting fixture in accordance with the present invention. FIG. 19 is an exploded view of a mounting fixture in accordance with the present invention. DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a perspective view of a gassing rail assembly 10 supported by a C-channel 12 in accordance with a first embodiment of the present invention. The gassing rail assembly 10 includes a rail base or bottom 14, upon which is two rail top or manifold assemblies 16 mounted end-to-end. Each rail top assembly 16 is secured to the rail bottom 14 via a plurality of rotating locking arms 18. A gas attachment 20 for laminar flow is coupled to the rail top assembly 16. An inverted U-shaped mount 22 is secured to the rail top assembly 16. A mounting structure 24 is secured between the C-channel 12 and the inverted U-shaped mount 22. A first hose (not shown) is used to couple a first gas source (not shown) to the laminar gas attachment 20. As is known in the art, the gas source is adapted for providing an inert gas, such as nitrogen, having a laminar flow. The mounting structure 24 may be used to stabilize and secure the gas hose. FIG. 2 is partial exploded view of the gassing rail assembly of FIG. 1. It can be seen that the rail bottom 14 includes three slots or gas distribution openings 26 corresponding to each rail top assembly 16. The three slots 26 are aligned end-to-end. Four studs 28 are shown secured to the rail bottom 14 via welding or other means. The studs 28 include threaded upper openings to receive a respective fastener or screw 30 for securing a respective rotating locking arm 18. Four threaded fasteners 32 are shown extending from the upper surface of the rail bottom 14 through respective openings in the rail bottom 14. The four threaded fasteners 32 are for securing the inverted U-shaped mounts 22 to the rail bottom 14. Four nuts 36 are shown on the top surface of each rail top assembly 16. The laminar flow gas attachment 20 includes a port block 38 and a port fitting 40. The inverted U-shaped mount 22 includes a bridge portion 42 and a pair of standoffs 44. FIG. 3 is a partial exploded view of the rail top assembly 16 and gas port 20 of FIG. 1. The rail top 46 may be made of plastic and includes the top surface 48 having four through holes 50, and two laminar port flow openings 52 with corresponding through holes 54 for securing the port block 38 via two fasteners 58. Two port block baffles 60 are located above corresponding O-rings 62. The three layer element 64 is shown to include two through holes 56 which correspond to two of the four through holes 50 in the rail top 46. The rail frame 66 is shown to include three slots or gas distribution openings 70 and four through holes 72 which correspond to the four through holes 50 in the rail top 46. FIG. 4A is a side view and FIG. 4B is a bottom view of the rail top assembly 16 and gas port 20 of FIG. 1. The four fasteners 74 are shown which extend through the rail frame 66, three layer element 64 and rail top 46, and are secured via the nuts 36. Each of the three slots or gas distribution openings 70 of the rail frame 66 is shown to include downward depending flange 76. FIGS. 5 shows a perspective bottom view of the rail top 46 of FIG. 1. The rail top 46 includes a lower portion 78 having a laminar flow channel 80. The laminar flow channel 80 extends generally along a longitudinally axis. The laminar flow port opening 52 is coupled to the laminar flow channel 80. The longitudinal laminar flow channel 80 is surrounded by an outer seat 82, the outer seat having a generally rectangular shape. The rail top includes an inner seat 84 located between the longitudinal laminar flow channel 80 and the outer seat 82, the inner seat 84 having a generally rectangular shape, wherein the three layer element 64 is received by the inner seat 84. The rail frame 66 is received by the outer seat 82. FIG. 6A is a top view of the rail top assembly of FIG. 1 and FIG. 6B is a cross sectional view taken along line A-A of FIG. 6A. The gas port 20 includes a port block 38 having a port fitting opening 88 and a first and second port block outlets 90, the port block 38 having a channel 92 in fluid communication with the port fitting opening 88 and the first and second port block outlets 90, wherein each of the port block outlets 90 includes a recessed seat 94 to receive a respective port block baffle 60 and an O-ring 62 located below the port block baffle 60, and the port block 38 is secured to the upper portion 48 of the rail top 46 with the first and second port block openings 90 aligned with a respective first and second laminar flow port openings 52, and the a port fitting opening 88 receives a port fitting 40. FIG. 7 is a perspective view of a rail top assembly 116 of a gassing rail assembly 110 in accordance with a second embodiment of the present invention. In this embodiment, the rail bottom 114 of FIG. 1 may be made of stainless steel. In addition, the rail top 146, the port block 138 and rail frame 166 are made of stainless steel. The rail top 146 includes a smooth surface 148 to prevent buildup of powder. FIG. 8 shows a partial exploded view of the rail top assembly 116 of FIG. 7. FIG. 9A shows a top view, FIG. 9B a side view and FIG. 9C a bottom view of the rail top 146 of FIG. 7. FIG. 10A shows a top view, FIG. 10B a side view, FIG. 10C a bottom view and FIG. 10D an end view of the port block 138 of FIG. 7. The upper surface of the rail frame 166 includes a recessed seat 200 for receiving the three layer element 202, The rail frame 166 and three layer element 202 are welded together. The upper portion of the rail top 146 includes a laminar flow port opening 204 have an oval shape, wherein the oval shaped laminar flow port opening 204 forms an inner recessed seat 206 and an outer recessed seat 208. A single layer oval shaped baffle 210 is received by the inner recessed seat 206. The gas port 120 includes a port block 138 having a port fitting opening 188 and an oval shaped port block outlet 190. The port block 138 having a channel 192 in fluid communication with the port fitting opening 188 and the oval shaped port block outlet 190, wherein the oval shaped port block outlet 190 includes a downward extending step 212 which is received by the outer recessed seat 208 of the rail top 146. The port block 138 is secured to the upper portion 148 of the rail top 146 with the oval shaped port block outlet 190 aligned with the oval shaped laminar flow port opening 204. The single layer oval shaped baffle 210 is in direct contact with the inner seat 206 of the rail top 146 and the downward extending step 212 of the port block 138, and the port fitting opening 188 receives a port fitting 140. FIG. 11A is a top view, FIG. 1 IB a side view and FIG. 1 IC is a bottom view of a three layer element 202 and an element holder 166 of FIG. 8. FIG. 12 is an exploded view of the three layer element 202 and an element holder 166 of FIG. 8. The three layer element 202 comprises a top layer 214, middle layer 216 and bottom layer 218. The top layer 214 is a 5-ply element, the middle layer 216 is a 5-ply element having three gas distribution opening 220, and the bottom layer 218 is a 2-ply element. FIG. 13 is a cross section of the gassing rail assembly of FIG. 1 taken through the rail bridge, with the C-channel and mounting fixture omitted, and the rail bottom and rail top assembly modified per the embodiment of FIG. 7. FIG. 14 is a perspective view of an inverted U-shaped mount 22 in accordance with the present invention. FIG. 15 is an exploded view of an inverted U-shaped mount 22 in accordance with the present invention. FIG. 16 shows a bottom exploded view of a portion of an inverted U-shaped mount 22 in accordance with the present invention. The inverted U-shaped mount 22 is shown including an upper bridge portion 42 and a pair of standoffs 44 extending downward from the upper bridge portion 42 forming lower ends 250. The lower ends 250 are secured to the top side of the rail bottom 114. The standoffs 44 include an upper end 252, the upper and lower ends 252 include an internally threaded opening 254. The upper bridge portion 42 having a first and second end 256. The ends of the bridge include openings 258 and are secured to respective upper end 252 of the standoff via a fastener 260 extending down through the opening 258 into the internally threaded opening 254 in the upper end 252 of the standoff 44. Each upper bridge portion 42 includes a rail bridge 262 and a clamp bar 264. The rail bridge262 has longitudinally extending sides 266, a top surface 270 of the rail bridge includes a slot 272 extending across a mid-portion from one longitudinal side 266 to the other longitudinal side 266. The slot 272 includes sides 274 and each side includes an undercut 276. The clamp bar 264 having a longitudinally extending shape with longitudinal sides 278 and ends 280. A bottom surface 282 of the rail bridge 262 includes a recessed cutout 284 having the shape of the clamp bar 264, with the recessed cutout 284 extending into the area of the bridge portion openings 258. The recessed cutout 284 forms a clamp opening 286 extending between the undercuts 276, wherein the recessed cutout 284 extends upward above an upper surface 288 of the slot 272 and wherein with the clamp bar 264 received within the recessed cutout 284 in an uppermost position with respect to the rail bridge262, an upper surface 290 of the clamp bar 264 extends above the upper surface 288 of the slot 272. FIG. 17 shows a partial exploded view of a mounting fixture 24 in accordance with the present invention. FIG. 18 is a cross sectional view of a mounting fixture 24 in accordance with the present invention. FIG. 19 is an exploded view of a mounting fixture 24 in accordance with the present invention. The mounting fixture 24 is adapted to depend from an overhead mounting structure. The mounting fixtures 24 include a lower end 296 having a slide bar 298. The slide bar 298 adapted to extend in a longitudinal direction at a right angle to the bridge portion 42. The slide bar 298 having longitudinal sides 300, each side having a ledge or foot 302 extending beyond the sides and in a longitudinal direction, whereby the slide bar 298 is adapted to be received by the rail bridge 262 in sliding engagement, and whereby tightening of the fasteners 260 extending through the ends 256 of the bridge portion 42 and upper ends 252 of the standoffs 44 clamps the second part of the sliding mechanism or slide bar 298 into a desired position relative to the first part of the sliding mechanism or inverted U-shaped mount 22. The mounting fixtures 24 include a rail height adjustment assembly 304. The rail height adjustment assembly 304 includes a lower shaft 306 having an upper end 308, a lower end 310 and an internal thread 312, and an upper assembly 314having an outside sleeve 316 and a rod 318 having an external threaded surface 320 for engagement with the internal thread 312 of the lower shaft 306, wherein the rod 318 is received by the outside sleeve 316. The upper end 322 of the outside sleeve 316 includes an oblong shaped opening 324, and the upper end 326 of the rod 318 includes an oblong shaped post 328 to be received in locking engagement with the oblong shaped opening 324, the internal surface of the lower end of the outside sleeve 316 includes an annular ring 330 having an O-ring 332, the upper end of the rod 318 includes a threaded opening 334 adapted to receive a fastener to be secured to the overhead mounting structure, the lower end of the shaft 306 is fixedly secured to the second part of the sliding mechanism or slide bar 298, such as via a fastener 336 and anti-rotation locking features 338. An aspect provides a gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising: a rail top assembly, the rail top assembly including, a rail top, the rail top having an upper portion with at least one laminar flow port opening, and a lower portion includes a laminar flow channel, the laminar flow channel extends generally along a longitudinally axis, the laminar flow port opening coupled to the laminar flow channel, the longitudinal laminar flow channel is surrounded by an outer seat, the outer seat having a generally rectangular shape, a gas port coupled to the laminar flow port opening, the gas port is adapted for coupling to a gas source, a three layer element having a planar shape which extends generally along a longitudinally axis, the three layer element has an upper surface and a lower surface, the three layer element is received by the lower portion of the rail top, and a rail frame which extends along a longitudinal axis, the rail frame has an upper surface and a lower surface, at least one gas distribution slot extending along a longitudinal axis, the rail frame substantially planar with a downward depending flange extending from the at least one gas distribution slot, the rail frame is received by the outer seat; and a rail bottom located below the top rail, the rail bottom adapted to receive at least one rail top assembly, the rail bottom having at least one gas distribution opening corresponding to each rail top assembly, the at least one gas distribution opening extending along the longitudinal axis of the rail bottom, and is aligned with the laminar flow channel, the gas distribution opening receives a corresponding downward depending flange and aligns the rail top assembly and rail bottom. The three layer element may comprise a top layer, a middle layer and a bottom layer. The top layer may include a 5-ply element. The middle layer may include a 5-ply element having at least one gas distribution opening. The bottom layer may include a 2-ply element. In an implementation, the rail top includes a plurality of through holes, the three layer element includes a plurality of through holes and the rail frame includes a plurality of through holes aligned with the through holes of the rail top and the three layer element. A plurality of fasteners may secure the rail frame and the three layer element to the rail top. The rail bottom may receive two rail top assemblies. The rail bottom may have two sets of three gas distribution openings, each set may correspond to one of the two rail top assemblies. Each rail frame may have three gas distribution slots. Each middle layer may have three gas distribution openings. The rail bottom may include two rotating locking arms per rail top assembly. The rotating locking arms may secure the rail top assembly to the rail bottom. The rail bottom may include two rail bridges. The gassing rail apparatus may comprise a rail height adjustment coupled to each rail bridge and, optionally, adapted to be coupled to an overhead support structure such as a C-channel. The rail height adjustment may include threaded concentric sleeves for adjusting the height of the rail bottom and rail top assembly. The rail height adjustment may include a slide bar. The rail bridge may include a slotted receiver for slidably receiving the slide bar. The rail bridge may include a clamp bar for clamping the slide bar in a desired position. The rail top may be made of plastic. The port block and / or the rail frame may be made of aluminum and / or stainless steel. The rail top may include an inner seat located between the longitudinal laminar flow channel and the outer seat. The three layer element may be received by the inner seat. The inner seat may have a generally rectangular shape. The upper portion of the rail top may include a first and a second laminar flow port opening. The first and second laminar flow port openings may be coupled to the laminar flow channel. The gas port may include a port block having a port fitting opening and a first and second port block outlets, the port block having a channel in fluid communication with the port fitting opening and the first and second port block outlets. Each of the port block outlets may include a recessed seat to receive a respective port block baffle and, optionally, an O-ring located below the port block baffle. The port block may be secured to the upper portion of the rail top with the first and second port block openings aligned with a respective first and second laminar flow port openings. The or a port fitting opening may receive a port fitting. One or more of the rail top, the port block and the rail frame may be made of stainless steel. The upper surface of the rail frame may include a recessed seat for receiving the three layer element. The rail frame and the three layer element may be welded together. The upper portion of the rail top may include a laminar flow port opening, optionally having an oval shape. The laminar flow port opening may form an inner recessed seat and an outer recessed seat. A single layer oval shaped baffle may be received by the inner recessed seat. The gas port may include a port block having a port fitting opening and a port block outlet, e.g. an oval shaped port block outlet. The port block may have a channel in fluid communication with the port fitting opening and the port block outlet. The port block outlet may include a downward extending step which is received by the outer recessed seat of the rail top. The port block may be secured to the upper portion of the rail top with the port block outlet aligned with the laminar flow port opening. The single layer baffle may be in direct contact with the inner seat of the rail top and the downward extending step of the port block. The port fitting opening may receive a port fitting. An aspect provides a gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising: at least one rail top assembly, the rail top assembly including a rail top and a port block; a rail bottom located below the top rail assembly, the rail bottom having a top side, an inlet end, an outlet end, a back side and a front side; a first and second pair of inverted U-shaped mounts, the inverted U-shaped mounts include an upper bridge portion having a first part of a sliding mechanism, and a pair of standoffs extending downward from the upper bridge portion forming lower ends, the lower ends of the first inverted U-shaped mount are secured to the top side of the rail bottom towards the inlet end, with the rail top assembly located between the first pair of standoffs, the lower ends of the second inverted U-shaped mount are secured to the top side of the rail bottom towards the outlet end, with the rail top assembly located between the second pair of standoffs; and a first and second mounting fixture adapted to depend from an overhead mounting structure, wherein the mounting fixtures include a lower end having a second part of a sliding mechanism, wherein the second part of the sliding mechanism of the first and second mounting fixtures are slidably engaged by, and releasably locked by, a respective first part of a sliding mechanism, whereby the weight of the lower rail is supported by the overhead mounting structure and the rail top assembly may be removed from the rail bottom with the rail bottom secured to the overhead mounting structure. The standoffs may include an upper end. The upper and lower ends may include an internally threaded opening. The upper bridge portion may have a first and second end. The first part of the sliding mechanism may be located between the first and second ends. The ends of the bridge may include openings and / or may be secured to respective upper end of the standoff via a fastener extending down through the opening into the internally threaded opening in the upper end of the standoff. Each upper bridge portion may include a rail bridge and a clamp bar. The rail bridge and the clamp bar may have longitudinally extending sides. A top surface of the rail bridge may include a slot extending across a mid-portion from one longitudinal side to the other longitudinal side. The slot may include sides and each side may include an undercut. The clamp bar may have a longitudinally extending shape with longitudinal sides and ends. A bottom surface of the rail bridge may include a recessed cutout having the shape of the clamp bar, with the recessed cutout extending into the area of the bridge portion openings, and / or wherein the recessed cutout forms a clamp opening extending between the undercuts. The recessed cutout may extend upward above an upper surface of the slot. With the clamp bar received within the recessed cutout in an uppermost position with respect to the rail bridge, an upper surface of the clamp bar may extend above the upper surface of the slot. A second part of the sliding mechanism may include a slide bar adapted to extend in a longitudinal direction at a right angle to the bridge portion. The slide bar may have longitudinal sides. Each side may have a ledge or foot extending beyond the sides and in a longitudinal direction. The second part of the sliding mechanism may be adapted to be received by the first part of the sliding mechanism in sliding engagement. Tightening of the fasteners extending through the ends of the bridge portion and upper ends of the standoffs may clamp the second part of the sliding mechanism into a desired position relative to the first part of the sliding mechanism. The first and / or second mounting fixtures may include a rail height adjustment assembly. The rail height adjustment assembly may include a lower shaft having an upper end, a lower end and an internal thread, and an upper assembly having an outside sleeve and a rod having an external threaded surface for engagement with the internal thread of the lower shaft, wherein the rod is received by the outside sleeve. The upper end of the outside sleeve may include an oblong shaped opening. The upper end of the rod may include an oblong shaped post to be received in locking engagement with the oblong shaped opening. The internal surface of the lower end of the outside sleeve may include an annular ring having an O-ring. The upper end of the rod may include a threaded opening adapted to receive a fastener to be secured to the overhead mounting structure. The lower end of the shaft may be fixedly secured to the second part of the sliding mechanism. An aspect provides a gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising: at least one rail top assembly, the rail top assembly including a rail top and a port block; a rail bottom located below the top rail assembly, the rail bottom having a top side, an inlet end, an outlet end, a back side and a front side; a first and second pair of inverted U-shaped mounts, the inverted U-shaped mounts include an upper bridge portion, and a pair of standoffs extending downward from the upper bridge portion forming lower ends, the lower ends of the first inverted U-shaped mount are secured to the top side of the rail bottom towards the inlet end, with the rail top assembly located between the first pair of standoffs, the lower ends of the second inverted U-shaped mount are secured to the top side of the rail bottom towards the outlet end, with the rail top assembly located between the second pair of standoffs; and a first and second mounting fixture adapted to depend from an overhead mounting structure, wherein the first and second mounting fixtures include a rail height adjustment assembly, wherein the rail height adjustment assembly includes a lower shaft having an upper end, a lower end and an internal thread, and an upper assembly having an outside sleeve and a rod having an external threaded surface for engagement with the internal thread of the lower shaft, wherein the rod is received by the outside sleeve, whereby the height of the rail bottom is adjustable with respect to the overhead mounting structure. The upper end of the outside sleeve may include an oblong shaped opening. The upper end of the rod may include an oblong shaped post to be received in locking engagement with the oblong shaped opening. The internal surface of the lower end of the outside sleeve may include an annular ring having an O-ring. The upper end of the rod may include a threaded opening adapted to receive a fastener to be secured to the overhead mounting structure. The lower end of the shaft may be fixedly secured to the second part of the sliding mechanism.

Claims

1. A gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising:a rail top assembly, the rail top assembly including,a rail top, the rail top having an upper portion with at least one laminar flow port opening, and a lower portion includes a laminar flow channel, the laminar flow channel extends generally along a longitudinally axis, the laminar flow port opening coupled to the laminar flow channel, the longitudinal laminar flow channel is surrounded by an outer seat, the outer seat having a generally rectangular shape,a gas port coupled to the laminar flow port opening, the gas port is adapted for coupling to a gas source,a three layer element having a planar shape which extends generally along a longitudinally axis, the three layer element has an upper surface and a lower surface, the three layer element is received by the lower portion of the rail top, anda rail frame which extends along a longitudinal axis, the rail frame has an upper surface and a lower surface, at least one gas distribution slot extending along a longitudinal axis, the rail frame substantially planar with a downward depending flange extending from the at least one gas distribution slot, the rail frame is received by the outer seat; anda rail bottom located below the top rail, the rail bottom adapted to receive at least one rail top assembly, the rail bottom having at least one gas distribution opening corresponding to each rail top assembly, the at least one gas distribution opening extending along the longitudinal axis of the rail bottom, and is aligned with the laminar flow channel, the gas distribution opening receives a corresponding downward depending flange and aligns the rail top assembly and rail bottom.

2. The gassing rail apparatus of claim 1, wherein the three layer element comprises a top layer, middle layer and bottom layer, optionally wherein the top layer is a 5-ply element and / or the middle layer is a 5-ply element having at least one gas distribution opening and / or the bottom layer is a 2-ply element.

3. The gassing rail apparatus of claim 1 or claim 2, wherein the rail top includes a plurality of through holes, the three layer element includes a plurality of through holes and the rail frame includes a plurality of through holes aligned with the through holes of the rail top and three layer element, and a plurality of fasteners secure the rail frame and the three layer element to the rail top.

4. The gassing rail apparatus of claim 1, claim 2 or claim 3, wherein the rail bottom receives two rail top assemblies, the rail bottom having two sets of three gas distribution openings, each set corresponding to one of the two rail top assemblies, each rail frame having three gas distribution slots, each middle layer having three gas distribution openings.

5. The gassing rail apparatus of any one of claims 1 to 4, wherein the rail bottom includes two rotating locking arms per rail top assembly, wherein the rotating locking arms secure the rail top assembly to the rail bottom.

6. The gassing rail apparatus of any one of claims 1 to 5, wherein the rail bottom includes two rail bridges.

7. The gassing rail apparatus of claim 6, further comprising a rail height adjustment coupled to each rail bridge and adapted to be coupled to an overhead support structure such as a C-channel, optionally wherein the rail height adjustment includes threaded concentric sleeves for adjusting the height of the rail bottom and rail top assembly.

8. The gassing rail apparatus of claim 7, wherein the rail height adjustment includes a slide bar, and the rail bridge includes a slotted receiver for slidably receiving the slide bar, the rail bridge optionally further including a clamp bar for clamping the slide bar in a desired position.

9. The gassing rail apparatus of any one of the preceding claims, wherein the rail top is made of plastic and / or the port block and / or the rail frame are made of aluminum and / or stainless steel.

10. The gassing rail apparatus of claim 9, wherein the rail top includes an inner seat located between the longitudinal laminar flow channel and the outer seat, wherein the three layer element is received by the inner seat, the inner seat optionally having a generally rectangular shape.

11. The gassing rail apparatus of any one of the preceding claims, wherein the upper portion of the rail top includes a first and second laminar flow port opening, the first and second laminar flow port openings coupled to the laminar flow channel, wherein the gas port includes a port block having a port fitting opening and a first and second port block outlets, the port block having a channel in fluid communication with the port fitting opening and the first and second port block outlets, wherein each of the port block outlets includes a recessed seat to receive a respective port block baffle and an O-ring located below the port block baffle, and the port block is secured to the upper portion of the rail top with the first and second port block openings aligned with a respective first and second laminar flow port openings, and the a port fitting opening receives a port fitting.

12. The gassing rail apparatus of any one of the preceding claims, wherein the rail top, the port block and the rail frame are made of stainless steel.

13. The gassing rail apparatus of claim 12, wherein the upper surface of the rail frame includes a recessed seat for receiving the three layer element, optionally wherein the rail frame and three layer element are welded together.

14. The gassing rail apparatus of any one of the preceding claims, wherein the upper portion of the rail top includes a laminar flow port opening have an oval shape, wherein the oval shaped laminar flow port opening forms an inner recessed seat and an outer recessed seat, a single layer oval shaped baffle is received by the inner recessed seat, wherein the gas port includes a port block having a port fitting opening and an oval shaped port block outlet, the port block having a channel in fluid communicationwith the port fitting opening and the oval shaped port block outlet, wherein the oval shaped port block outlet includes a downward extending step which is received by the outer recessed seat of the rail top, and the port block is secured to the upper portion of the rail top with the oval shaped port block outlet aligned with the oval shaped laminar flow port opening, wherein the single layer oval shaped baffle is in direct contact with the inner seat of the rail top and the downward extending step of the port block, and the port fitting opening receives a port fitting.

15. A gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising:at least one rail top assembly, the rail top assembly including a rail top and a port block;a rail bottom located below the top rail assembly, the rail bottom having a top side, an inlet end, an outlet end, a back side and a front side;a first and second pair of inverted U-shaped mounts, the inverted U-shaped mounts include an upper bridge portion having a first part of a sliding mechanism, and a pair of standoffs extending downward from the upper bridge portion forming lower ends, the lower ends of the first inverted U-shaped mount are secured to the top side of the rail bottom towards the inlet end, with the rail top assembly located between the first pair of standoffs, the lower ends of the second inverted U-shaped mount are secured to the top side of the rail bottom towards the outlet end, with the rail top assembly located between the second pair of standoffs; anda first and second mounting fixture adapted to depend from an overhead mounting structure, wherein the mounting fixtures include a lower end having a second part of a sliding mechanism, wherein the second part of the sliding mechanism of the first and second mounting fixtures are slidably engaged by, and releasably locked by, a respective first part of a sliding mechanism, whereby the weight of the lower rail is supported by the overhead mounting structure and the rail top assembly may be removed from the rail bottom with the rail bottom secured to the overhead mounting structure.

16. The gassing rail apparatus of claim 15, wherein the standoffs include an upper end, the upper and lower ends include an internally threaded opening, the upper bridge portion having a first and second end, with the first part of the sliding mechanism located between the first and second ends, the ends of the bridge include openings and are secured to respective upper end of the standoff via a fastener extending down through the opening into the internally threaded opening in the upper end of the standoff.

17. The gassing rail apparatus of claim 16, wherein each upper bridge portion includes a rail bridge and a clamp bar, the rail bridge and clamp bar has longitudinally extending sides, a top surface of the rail bridge includes a slot extending across a mid-portion from one longitudinal side to the other longitudinal side, the slot includes sides and each side includes an undercut, the clamp bar having a longitudinally extending shape with longitudinal sides and ends, a bottom surface of the rail bridge includes a recessed cutout having the shape of the clamp bar, with the recessed cutout extending into the area of the bridge portion openings, and wherein the recessed cutout forms a clamp opening extending between the undercuts, wherein the recessed cutout extends upward above an upper surface of the slot and wherein with the clamp bar received within the recessed cutout in an uppermost position with respect to the rail bridge, an upper surface of the clamp bar extends above the upper surface of the slot.

18. The gassing rail apparatus of claim 17, wherein a second part of the sliding mechanism includes a slide bar adapted to extend in a longitudinal direction at a right angle to the bridge portion, the slide bar having longitudinal sides, each side having a ledge or foot extending beyond the sides and in a longitudinal direction, whereby the second part of the sliding mechanism is adapted to be received by the first part of the sliding mechanism in sliding engagement, and whereby tightening of the fasteners extending through the ends of the bridge portion and upper ends of the standoffs clamps the second part of the sliding mechanism into a desired position relative to the first part of the sliding mechanism.

19. The gassing rail apparatus of any one of claims 15 to 18, wherein the first and second mounting fixtures include a rail height adjustment assembly.

20. The gassing rail apparatus of claim 19, wherein the rail height adjustment assembly includes a lower shaft having an upper end, a lower end and an internal thread, and an upper assembly having an outside sleeve and a rod having an external threaded surface for engagement with the internal thread of the lower shaft, wherein the rod is received by the outside sleeve.

21. The gassing rail apparatus of claim 20, wherein the upper end of the outside sleeve includes an oblong shaped opening, and the upper end of the rod includes an oblong shaped post to be received in locking engagement with the oblong shaped opening, the internal surface of the lower end of the outside sleeve includes an annular ring having an O-ring, the upper end of the rod includes a threaded opening adapted to receive a fastener to be secured to the overhead mounting structure, the lower end of the shaft is fixedly secured to the second part of the sliding mechanism.

22. A gassing rail apparatus to be used in a food packaging conveyor system, the gassing rail apparatus adapted to be coupled to a gas source, comprising:at least one rail top assembly, the rail top assembly including a rail top and a port block;a rail bottom located below the top rail assembly, the rail bottom having a top side, an inlet end, an outlet end, a back side and a front side;a first and second pair of inverted U-shaped mounts, the inverted U-shaped mounts include an upper bridge portion, and a pair of standoffs extending downward from the upper bridge portion forming lower ends, the lower ends of the first inverted U-shaped mount are secured to the top side of the rail bottom towards the inlet end, with the rail top assembly located between the first pair of standoffs, the lower ends of the second inverted U-shaped mount are secured to the top side of the rail bottom towards the outlet end, with the rail top assembly located between the second pair of standoffs; anda first and second mounting fixture adapted to depend from an overhead mounting structure, wherein the first and second mounting fixtures include a rail height adjustment assembly, wherein the rail height adjustment assembly includes a lower shaft having an upper end, a lower end and an internalthread, and an upper assembly having an outside sleeve and a rod having an external threaded surface for engagement with the internal thread of the lower shaft, wherein the rod is received by the outside sleeve, whereby the height of the rail bottom is adjustable with respect to the overhead mounting structure.

23. The gassing rail apparatus of claim 22, wherein the upper end of the outside sleeve includes an oblong 5 shaped opening, and the upper end of the rod includes an oblong shaped post to be received in locking engagement with the oblong shaped opening, the internal surface of the lower end of the outside sleeve includes an annular ring having an O-ring, the upper end of the rod includes a threaded opening adapted to receive a fastener to be secured to the overhead mounting structure, the lower end of the shaft is fixedly secured to the second part of the sliding mechanism.10

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