HIGH SPEED PARALLEL PROCESS INSULATED GLASS MANUFACTURING LINE

Abstract

A high speed parallel manufacturing line for manufacturing insulated glass units, the manufacturing line including a gas filling topping press that mates a spacer applied lite supplied to the topping press and a topping lite supplied to the topping press to create an insulated glass unit and fills the insulated glass unit with a non-air gas. A heating station applies localized heat to adhesive of the spacer material. A sealing press applies pressure to the insulated glass unit and facilitates further sealing of the spacer material to the spacer applied lite and the topping lite. The line may include a fourth corner sealer that completes sealing of the airspace of the IGU prior to finishing of the IGU.

Claims

1. A vertical high speed parallel manufacturing line for manufacturing insulated glass units, the manufacturing line comprising: a gas filling topping press that mates a spacer applied lite supplied to the topping press and a topping lite supplied to the topping press to create an insulated glass unit and fills the insulated glass unit with a non-air gas; a heating station that applies localized heat to adhesive of the spacer material; and a sealing press that applies pressure to the insulated glass unit and facilitates further sealing of the spacer material to the spacer applied lite and the topping lite.

2. The high speed parallel manufacturing line as claimed in claim 1, wherein the sealing press further applies pressure to the insulated glass unit to press the insulated glass unit to a desired thickness.

3. The high speed parallel manufacturing line as claimed in claim 1, wherein the sealing press further comprises a platen press having at least one front platen and one back platen.

4. The high speed parallel manufacturing line as claimed in claim 1, wherein the sealing press further comprises a vertical roller press, the vertical roller press having a series of vertical; rollers between which the insulated glass unit is pressed.

5. The high speed parallel manufacturing line as claimed in claim 1, further comprising an insulated glass unit spacer applicator having a spacer dispensing head configured to leave a fourth corner of the spacer material unsealed and wherein the topping press is also configured to leave a fourth corner of the insulated glass unit unsealed.

6. The high speed parallel manufacturing line as claimed in claim 1, wherein the single gas press further comprises a housing enclosing the front platen and the back platen and further comprising side doors and gas ducts.

7. The high speed parallel manufacturing line as claimed in claim 1, wherein the single gas press further comprises a shuttle whereby the single gas press is moved between a front conveyor system and a back conveyor system and wherein the single gas press receives spacer applied lites from one of the front conveyor system and the back conveyor system and topping lites from the other of the front conveyor system and the back conveyor system.

8. The high speed parallel manufacturing line as claimed in claim 1, wherein the topping press comprises a double gas press that processes and fills two of the insulated glass units at once thereby facilitating desirable gas fill percentages while supporting improved cycle times.

9. The high speed parallel manufacturing line as claimed in claim 1, further comprising an insulated glass unit spacer applicator having a spacer dispensing head configured to apply perimeter spacer material to a glass lite to create a spacer applied lite.

10. The high speed parallel manufacturing line as claimed in claim 1, wherein the heat station further comprises vertically oriented linear infrared heating units.

11. The high speed parallel manufacturing line as claimed in claim 1, wherein the heat station further comprises horizontally oriented linear infrared heating units.

12. The high speed parallel manufacturing line as claimed in claim 1, wherein the heat station further comprises heating units that are controllably movable to apply heat to desired areas of the insulated glass unit.

13. The high speed parallel manufacturing line as claimed in claim 1, further comprising a fourth corner sealer station.

14. The high speed parallel manufacturing line as claimed in claim 13, wherein the fourth corner sealer station further comprises a fourth corner sealer selected from a groups consisting of an angled rocking device, a roller device and a two part angled press device.

15. The high speed parallel manufacturing line as claimed in claim 9, wherein the insulated glass unit spacer applicator further comprises a temperature controlled spacer storage unit that maintains the spacer material above ambient temperature to facilitate wetting of adhesive of the spacer material.

16. The high speed parallel manufacturing line as claimed in claim 1, further comprising heaters wherein at least a portion of the high speed parallel manufacturing line is maintained above ambient temperature to facilitate wetting of adhesive of the spacer material.

17. The high speed parallel manufacturing line as claimed in claim 1, wherein the heating station further comprises focused infrared heaters that apply focused infrared radiation in a vicinity of the spacer material to facilitate wetting of adhesive of the spacer material.

18. The high speed parallel manufacturing line as claimed in claim 17, wherein the focused infrared heaters are movable.

19. The high speed parallel manufacturing line as claimed in claim 17, wherein the focused infrared heaters further include vertical heaters and horizontal heaters.

20. A method of manufacturing insulated glass units, comprising: conveying a spacer applied lite to a high speed press and seal mechanism; mating a topping lite with the spacer applied lite with the high speed press and seal mechanism to create an insulated glass unit; filling the insulated glass unit with a non-air gas; and applying pressure to the insulated glass unit to further seal the insulated glass unit in a separate press.

21. The method of manufacturing insulated glass units as claimed in claim 20, further comprising: receiving the spacer applied lite from one of a front conveyor system and a back conveyor system with a topping lite from another of the front conveyor system and the back conveyor system to create the insulated glass unit.

22. The method of manufacturing insulated glass units as claimed in claim 20, further comprising: leaving a fourth corner of the insulated glass unit unsealed after filling the insulated glass unit with a non-air gas; and sealing the fourth corner with a fourth corner sealer.

23. The method of manufacturing insulated glass units as claimed in claim 22, further comprising locally heating the fourth corner prior to sealing.

24. The method of manufacturing insulated glass units as claimed in claim 22, further comprising sealing the fourth corner by application of a roller device, an angled rocking device, and a two part angled press device.

25. The method of manufacturing insulated glass units as claimed in claim 20, further comprising locally heating edges of the insulated glass unit with focused infrared light to facilitate sealing of single seal spacer material.

26. The method of manufacturing insulated glass units as claimed in claim 20, further comprising locally heating vertical edges and horizontal edges of the insulated glass unit independently of each other with infrared light to facilitate sealing of single seal spacer material.

27. The method of manufacturing insulated glass units as claimed in claim 20, further comprising locally heating edges by moving a focused infrared light source relative to the insulated glass unit.

28. The method of manufacturing insulated glass units as claimed in claim 20, further comprising utilizing a double gas press in the high speed press and seal mechanism to fill two of the insulated glass units at once thereby facilitating desirable gas fill percentages while supporting improved cycle times.

29. The method of manufacturing insulated glass units as claimed in claim 20, further comprising utilizing a platen press to apply pressure to the insulated glass unit to further seal the insulated glass unit.

30. The method of manufacturing insulated glass units as claimed in claim 20, further comprising utilizing a roller press to apply pressure to the insulated glass unit to further seal the insulated glass unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG. 1 is a block diagram depicting a high speed parallel process insulating glass manufacturing line according to an example embodiment of the invention;

[0070] FIG. 2 is an end elevational view of an IGU spacer applicator according to an example embodiment of the invention;

[0071] FIG. 3 is a schematic depiction of an IGU spacer applicator at the beginning of spacer application to a spacer applied lite;

[0072] FIG. 4 is a schematic depiction of an IGU spacer applicator during spacer application to a spacer applied lite bottom edge;

[0073] FIG. 5 is a schematic depiction of an IGU spacer applicator during spacer application to a spacer applied lite trailing edge;

[0074] FIG. 6 is a schematic depiction of an IGU spacer applicator beginning spacer application to a spacer applied lite top edge;

[0075] FIG. 7 is a schematic depiction of an IGU spacer applicator continuing spacer application to a spacer applied lite top edge;

[0076] FIG. 8 is a schematic depiction of an IGU spacer applicator during spacer application to a spacer applied lite leading edge;

[0077] FIG. 9 is a schematic depiction of a dual head IGU secondary sealer at the initiation of an IGU sealing sequence;

[0078] FIG. 10 is a schematic depiction of a dual head IGU secondary sealer as a first sealing head applies secondary sealant to a leading edge of an insulated glass unit and a second sealing head engages the bottom edge of the insulated glass unit;

[0079] FIG. 11 is a schematic depiction of a dual head IGU secondary sealer as a first sealing head applies secondary sealant to a top edge of an insulated glass unit and a second sealing head applies sealant to the bottom edge of the insulated glass unit;

[0080] FIG. 12 is a schematic depiction of a dual head IGU secondary sealer as the first sealing head completes application of secondary sealant to a top edge of an insulated glass unit and the second sealing head completes application of sealant to the bottom edge of the insulated glass unit;

[0081] FIG. 13 is a schematic depiction of a dual head IGU secondary sealer as the first sealing head applies secondary sealant to a trailing edge of an insulated glass unit and a second sealing head disengages from the bottom edge of the insulated glass unit;

[0082] FIG. 14 is an elevational view of a double gas press according to an embodiment of the invention;

[0083] FIG. 15 is an elevational view of a single gas press according to an embodiment of the invention;

[0084] FIG. 16 is a block diagram depicting a high speed parallel process insulating glass manufacturing line with gas filling according to another example embodiment of the invention;

[0085] FIG. 17 is a front elevational view of a heating station according to an example embodiment;

[0086] FIG. 18 is a side elevational view of the heating station of claim 17;

[0087] FIG. 19 is perspective view of a vertical sealing roller press according to an example embodiment of the invention;

[0088] FIG. 20A is a perspective view of a vertical sealing platen press according to an example embodiment of the invention;

[0089] FIG. 20B is a perspective view of a gas fill manifold assembly according to an example embodiment of the invention;

[0090] FIG. 21A is a perspective view of a fourth corner sealer incorporating a roller according to an example embodiment of the invention;

[0091] FIG. 21B is a detail perspective view of a fourth corner sealer roller according to an example embodiment of the invention;

[0092] FIG. 22 is a perspective view of a fourth corner sealer incorporating an angled rocking structure according to an example embodiment of the invention;

[0093] FIG. 23 is a perspective view of a two part angled fourth corner sealer according to an example embodiment of the invention;

[0094] FIG. 24 is a perspective view of a fourth corner infrared heater according to an example embodiment of the invention; and

[0095] FIG. 25 is a perspective view of an auto-topping press according to an example embodiment of the invention.

DETAILED DESCRIPTION

[0096] Referring to FIG. 1 according to an example embodiment of the invention, high speed parallel process insulating glass manufacturing line 50 generally includes infeed station 52, washer 54, inspection station 56, shuttle 58, driven parallel infeed conveyor 60, IGU spacer applicator 62, following queue station 64, driven grid station 66, second queue station 68, gas press and fill station 70, secondary edge sealer 72, and non-driven outfeed queue station 74. This example embodiment may include elements that are optional as will be discussed herein. However, the elements of the invention are to be defined by the claims appended hereto.

[0097] Infeed station 52 is generally conventional in design and known to those skilled in the art and need not be further described.

[0098] Washer 54 is general conventional in design and need not be described further herein. Washers 54 are known to those skilled in the art and are available from a number of manufacturers. Washer 54 however, is a glass lite or pane washer that operates with the lite in a generally vertical orientation.

[0099] Inspection station 56 is generally conventional in design and need not be further described herein.

[0100] Shuttle 58 according to an example embodiment of the invention includes double shuttle mechanism 76. Double shuttle mechanism 76 travels back and forth and divides incoming lites from infeed station 52, washer 54 and inspection station 56 into spacer applied lites 78 and topping lites 80. According to an example embodiment of the invention, spacer applied lites 78 are directed to front conveyor line 82 while topping lites 80 are directed to rear conveyor line 84. For the purposes of discussion of the invention, while spacer applied lite 78 and topping lite 80 may be identical or similar pieces of glass, spacer applied lite 78 refers to lites to which a perimeter spacer has been or will be applied during the manufacturing process while topping lite 80 refers to lites that will be applied on top of the spacer applied lite and perimeter spacer to create a partially assembled insulated glass unit.

[0101] Front conveyor line 82 generally transports spacer applied lites 78. Front conveyor line 82 extends generally from shuttle 58 to gas press and fill station 74. This should not be considered limiting as depending upon the exact design of high speed parallel manufacturing line 50 according to example embodiments of the invention, this extent may vary. Rear conveyor line 84 generally transports topping lites 80 and, similar to front conveyor line 82, in an example embodiment, extends generally from shuttle 58 to gas press and fill station 74.

[0102] Driven parallel infeed conveyor 60 is generally conventional in design and known to those skilled in the art and need not be further described here. Driven parallel infeed conveyor 60 includes front conveyor line 82 and rear conveyor line 84 upon which spacer applied lite 78 and topping lite 80 are conveyed.

[0103] Referring to FIGS. 2-8, IGU spacer applicator 62 generally includes applicator head 86, applicator gantry 88 and servo driven cup 90. Front conveyor line 82 upon which spacer applied lite 78 is transported is accessible to applicator head 86. Rear conveyor line 84 transports topping lites through IGU spacer applicator 62 to the rear.

[0104] Applicator head 86 is supported by applicator gantry 88 and applicator head 86, in combination with applicator gantry 88, is capable of translation in x, y and z axes. Applicator head 86 is generally also capable of rotational movement about the z axis to facilitate application of spacers to spacer applied lite 78.

[0105] Servo driven cup 90 supports suction cups configured to selectively grip spacer applied lite 78. Such suction cups are generally conventional and need not be further described here to those of ordinary skill in the art. As best seen in FIG. 4, servo driven cup 90 is configured to grip spacer applied lite 78 and advance it slightly prior to the beginning of application to permit the staging of a following spacer applied lite 78 while a perimeter spacer is applied to the leading spacer applied lite 78.

[0106] IGU spacer applicator 62 generally also includes vertical support 104 in addition to front conveyor 100 and rear conveyor 102.

[0107] Referring particularly to FIGS. 3-8, according to an example embodiment of the invention, spacer is applied while spacer applied lite 78 is moving forward. Thus, applicator head 86 and applicator gantry 88 are configured to follow spacer applied lite 78 as it is conveyed forward and to apply spacer while spacer applied lite 78 is being conveyed forward.

[0108] According to an example embodiment of the invention, movement of applicator head 86, applicator gantry 88 and servo driven cup 90 are coordinated with each other so that spacer is applied first to bottom edge 92 of spacer applied lite 78 followed by trailing edge 94 of spacer applied lite 78 then top edge 96 and leading edge 98 in sequence while spacer applied lite 78 travels forward. Accordingly, applicator head 86 first travels backward relative to the motion of spacer applied lite 78 to apply spacer bottom edge 92 of spacer then upward to apply spacer to trailing edge 94 then forward relative to spacer applied lite 78 to apply spacer to top edge 96. Applicator head 86 then travels downward along leading edge 96 to complete spacer application around the perimeter of spacer applied lite 78. All the while spacer applied lite 78 travels forward on the assembly line.

[0109] According to an example embodiment of the invention, applicator head 86 then rotates in a clockwise direction while returning to apply spacer to a following spacer applied lite 78.

[0110] Driven grid station 66 is generally conventional in design and includes grid applicator 106. Driven grid station 66 is generally conventional in design and need not be further described here.

[0111] Gas press and fill station 70 according to example embodiments of the invention may include double gas press 108 or single gas press 110.

[0112] According to an example embodiment, depicted in FIG. 14, double gas press 108 includes two gas press compartments 112 including front gas press compartment 114 and rear gas press compartment 116. Each of front gas press compartment 114 and rear gas press compartment 116 include gas ducts 118 and internal conveyor 120.

[0113] Double gas press 108 generally includes three platens 122. Platens 122 include front platen 124, central platen 126 and back platen 128. Each of the three platens 122 includes suction grippers (not depicted) on at least one surface thereof. According to an example embodiment of the invention, front platen 124 includes suction grippers (not depicted) on one surface thereof while central platen 126 includes suction grippers on two surfaces thereof and back platen 128 includes suction grippers on one surface thereof.

[0114] Double gas press 108 includes gas supply 130 as well. Front gas press compartment 114 and rear gas press compartment 116 are configured to open and close to accept spacer applied lites 78 and topping lites 80. Double gas press 108 is configured so that front gas press compartment 114 and rear gas press compartment 116 shuttle back and forth to align with front conveyor 100 and rear conveyor 102.

[0115] Front platen 124 is configured to be movable back and forth relative to central platen 126 to open and close front gas compartment 114 while also bringing spacer applied lite 78 into close proximity to topping lite 80 for mating. Rear gas press compartment 116 is configured so that back platen 128 and central platen 126 may be moved relative to each other in a similar fashion.

[0116] According to another example embodiment depicted in FIG. 15, single gas press 110 generally includes housing 132 enclosing front platen 134 and back platen 136. Housing 132 further includes side doors 138, internal conveyor 140 and gas ducts 142. Single gas press 110 is structured to travel or shuttle forward and back between front conveyor 100 and rear conveyor 102. Front platen 134 is movable relative to back platen 136. Gas ducts 142 may be located below, at the leading edge or at the trailing edge of single gas press 110. Side doors 138 are configured to open and close to contain gas therein and exclude atmospheric gas during the gas filling process.

[0117] If gas ducts 142 are located below the location at which spacer applied lites 78 are received, gas ducts may be configured to withdraw and advance while internal conveyor 140 is withdrawn and advanced to permit gas filling. For example, gas ducts 142 and internal conveyor 140 can be mutually coupled and movable perpendicular to their long axis.

[0118] Referring to FIGS. 9-13, according to an example embodiment, secondary edge sealer 72 generally includes first edge sealing head 144, second edge sealing head 146, servo driven cup 148, and gantry 150.

[0119] According to an example embodiment of the invention, first edge sealing head 144 is supported by gantry 150. Second edge sealing head 146 is separately located at a lower edge of where insulated gas units that have been gas filled and pressed pass through secondary edge sealer 72. According to an example embodiment of the invention, first edge sealing head 144 travels on gantry 140 to apply secondary edge sealant to leading edge 98, top edge 96 and trailing edge 94 of insulated glass units. Second edge sealing head 146 applies secondary edge sealant to bottom edge 92 of insulated glass units. According to an example embodiment of the invention, servo driven cups 148 grip and transport the insulated glass unit forward. It is notable that according to the present invention, insulated glass units never travel backwards on the conveyor line but always move forward. This is also true of spacer applied lites 78 as spacers are applied to them. Servo driven cups 148 are configured to displace the insulated glass unit forward to permit staging of a following insulated glass unit 78 while the first unit is being edge sealed.

[0120] According to an example embodiment of the invention, each of the first edge sealing heads 144 and lower second edge sealing heads 146 includes first corner wiper 152 and second corner wiper 154 that eliminate or minimize the need for operator touch-up of insulated glass units. First corner wiper 152 is coupled to first edge sealing head 144 while second corner wiper 154 is coupled to second edge sealing head 146.

[0121] Having been secondary edge sealed the insulated glass unit is conveyed from secondary edge sealer 72 to non-driven outfeed queue station 74.

[0122] Non-driven outfeed queue station 74 is generally conventional in design and need not be further described here.

[0123] According to another embodiment of the invention, the invention includes a method of manufacturing insulated glass units. According to an embodiment of the invention, the method includes receiving glass lites at infeed station 52; conveying the glass lites to washer 54; washing and drying the glass lites in washer 54; conveying the glass lites to an inspection station 56 and further conveying the glass lites to shuttle 58. The method may include shuttling alternate lites to front conveyor line 82 and rear conveyor line 84 and shuttle 58 and distributing spacer applied lites 78 to front conveyor line 82 and distributing topping lites 80 to rear conveyor line 84. The method may then include conveying spacer applied lites 78 and topping lite 80 through infeed conveyor 60 to IGU spacer applicator 62.

[0124] The method may further include applying IGU spacer to spacer applied lite 78 while spacer applied lite 78 is constantly moving forward or at least never being moved backward.

[0125] The method may further include applying spacer to spacer applied lite 78 first, along bottom edge 92, second, along trailing edge 94, third, along top edge 96 and fourth, along leading edge 98. The method further includes conveying spacer applied lite 78 from IGU spacer applicator 62 to following queue station 64.

[0126] The method also includes optionally applying grids at driven grid station 66.

[0127] According to another embodiment, the method includes conveying spacer applied lite 78 and topping lite 80 via second queue station 68 to gas press and fill station 70.

[0128] According to one embodiment of the invention, the method further includes gas filling and applying topping lite 80 to spacer applied lite 78 in double gas press 108.

[0129] The method further includes in another embodiment applying topping lite 80 to spacer applied lite 78 and gas filling in single gas press 110.

[0130] A method according to an embodiment of the invention includes mating topping lite 80 with spacer applied lite 78 in a double gas press. In this embodiment of the invention, alternate insulated glass units are assembled in a front gas compartment 114 and a rear gas compartment 116 of double gas press 108.

[0131] According to another embodiment of the invention, the method further includes mating topping lite 80 with spacer applied lite 78 and gas filling in single gas press 110.

[0132] According to another embodiment of the invention, the method further includes conveying an insulated glass unit from double gas press 108 or single gas press 110 to secondary edge sealer 72. The method further includes secondary edge sealing of the insulated glass unit by first edge sealing head 144 and second edge sealing head 146. The method further includes sealing in sequence leading edge 98, top edge 96, and trailing edge 94 of the insulated glass unit with first edge sealing head 144 while simultaneously sealing bottom edge 92 with second edge sealing head 146. The method according to the invention further includes conveying the insulated glass unit with servo driven cup 148 during the edge sealing process. The method may further include secondary edge sealing the insulated glass unit while continuously moving the insulated glass unit forward in the conveying process.

[0133] Referring to FIGS. 16-24, another embodiment of high speed parallel manufacturing line 50 is depicted.

[0134] Referring to FIG. 16, the depicted embodiment generally includes infeed station 156, vertical washer 158, inspection station 160, shuttle 162, driven parallel infeed conveyor 164, single seal IGU spacer applicator 166, following queue station 168, driven grid station 170, second queue station 172, press and seal unit 174, heating station 176, vertical press 178, and fourth corner sealer 180.

[0135] Infeed station 156 is generally conventional in design and similar to that described above.

[0136] Vertical washer 158 is generally conventional in design and similar to that described above.

[0137] Inspection station 160 is generally conventional in design and similar to that described above.

[0138] Shuttle 162 is similar to that described above.

[0139] Driven parallel infeed conveyor 164 is similar to that described above.

[0140] Single seal IGU spacer applicator 166 is adapted to apply single seal spacer products. Single seal spacer products are utilized without the need to apply a secondary seal and without a need for corner notching as the single seal spacer products are flexible enough to be applied at corners of the IGU by bending the single seal spacer product. Referring to FIG. 2, single seal IGU spacer applicator 166 includes heated spacer drum 182 for storage of spacer material. The motion and structure of single seal IGU spacer applicator 166 is similar to that described above with relation to applicator head 86, applicator gantry 88 and servo driven cup 90. Single seal IGU spacer applicator 166 is constructed and adapted so that when spacer material is applied, a fourth corner of the insulated glass unit is left slightly open to ambient air.

[0141] Following queue station 168 is generally conventional and similar to that described above.

[0142] Driven grid station 170 is generally conventional and similar to that described above.

[0143] Second queue station 172 is generally conventional and similar to that described above.

[0144] Referring to FIGS. 20B and 25, press and seal unit 174 may include auto topping press with gas fill 184 and infeed shuttle 186. Auto topping press may also include gas fill manifold assembly 187.

[0145] Referring to FIGS. 17 and 18, heating station 176 follows press and seal unit 174 and generally includes: heating station frame 188, conveyor 190 and infrared heating units 192. In the depicted embodiment, infrared heating units 192 are configured to heat eight edges of an insulated glass unit being processed. That is both sided of each edge of a rectangular IGU. Infrared heating units 192 heating units may also be adapted to heat the edges of IGUs that are not rectangular in shape, such as polygonal IGUs, circular IGUs or arch topped IGUs.

[0146] In the depicted embodiment, infrared heating units 192 include focused infrared lamps 194 that are linear in nature. This should not be considered limiting. Infrared heating units 192 may be of any desired shape. Focused infrared lamps 194 may be fixed or movable. If they are movable, focused infrared lamps 194 may be movable along with the IGU as it is conveyed. Infrared heating units 192 may include vertical heater 196 and horizontal heater 198. If movable, both vertical heater 196 and horizontal heater 198 may be moved to align with the respective vertical and horizontal edges of an insulated glass unit as it is conveyed.

[0147] If fixed, vertical heater 196 and horizontal heater 198 are of sufficient length to heat the height and width of the largest insulated glass unit capable of being processed. If vertical heater 196 is fixed, the insulated glass unit may be paused as it is being conveyed twice to heat vertical edges. Horizontal heater 198 may be used to apply heat to horizontal edges of an insulated glass unit while the insulated glass unit is being conveyed. In this case, horizontal heater 198 is positionable and adjustable as to vertical separation to heat the upper and lower edges of insulated glass units passing through heating station 176 of a variety of heights of IGUs.

[0148] Referring to FIGS. 19 and 20, vertical press 178 in various embodiments of the invention may include platen press 200 or roller press 202.

[0149] Referring to FIGS. 20A and 20B, application of platen press 200 is expected to minimize rebound and the consequent displacement of filler gas contained within an insulated glass unit which still has an open corner. Platen press 200 generally includes: base frame 204, front platen assembly 206, back platen assembly 208, conveyor assembly 212 and platen shifter assembly 214. Base frame 204 supports front platen assembly 206 and back platen assembly 208. At least one of front platen assembly 206 and back platen assembly 208 is movable relative to the other by the operation of platen shifter assembly 214. Conveyor assembly 212 is located slightly below and between front platen assembly 206 and back platen assembly 208 and allows conveying of an insulated glass unit into and out of the space between front platen assembly 206 and back platen assembly 208.

[0150] Referring now to FIG. 19, roller press 202 generally includes roller base frame 216, front roller set 218 and back roller set 220. In the depicted embodiment, front roller set 218 includes seven rollers 222 and back roller set 220 includes seven rollers 222. Rollers 222 may be heated. Roller press 202 generally also includes drive motor 224 and serpentine belt or chain 226. Serpentine belt or chain 226 is coupled to drive motor 224 and to idler rollers as depicted in FIG. 19. Use of roller press 202 has the advantage that it allows continuous forward movement of an IGU being processed.

[0151] Referring now to FIGS. 21A-24, fourth corner sealer 180 generally includes base frame 228 supporting fourth corner sealing device 230. Fourth corner sealing device 230 may include angled rocking fourth corner sealer 232, roller fourth corner sealer 234 or two-part angled fourth corner sealer 236.

[0152] Referring to FIG. 22, angled rocking fourth corner sealer 232 generally includes angled portion 238 and rocking mechanism 240. Angled portion 238 generally represents an inside corner 242. Rocking mechanism 240 may include linear actuator 244. Angled portion 238 acts about pivot of inside corner 246.

[0153] Roller fourth corner sealer 234, in an embodiment depicted in FIG. 21B, generally includes linear actuators 248 and corner roller 250. Linear actuators 248 act orthogonally relative to each other and are configured to move corner roller 250 around a corner to be sealed. Corner roller 250 is typically of a diameter much greater than the depth of set back of the spacer of the insulated glass unit and may present multiple rollers of different widths as depicted to accommodate different thickness spacers.

[0154] Two part angled fourth corner sealer 236, in an embodiment depicted in FIG. 23, generally includes first angled sealer 252 for vertical edge and second angled sealer 254 for horizontal edge, vertical edge linear actuator 253 and horizontal edge linear actuator 255.

[0155] Referring now to FIG. 24, according to an example embodiment, fourth corner sealer 180 includes fourth corner infrared heater 256. In the depicted embodiment fourth corner infrared heater 256 includes two heat lamps 258 inside protective shrouds 260.

[0156] In operation, glass lites are fed into high speed parallel manufacturing line 50 at infeed station 52. Glass lites are conveyed to washer 54 where they are washed and dried. Glass lites are then conveyed to inspection station 56 for inspection. Then glass lites are conveyed to shuttle 58 which places alternate glass lites on front conveyor 100 or rear conveyor 102. Spacer applied lites 78 are transported on front conveyor 100 while topping lites 80 are transported on rear conveyor 102. Spacer applied lites 78 are then transported to IGU spacer applicator 62 where spacer is applied first to bottom edge 92, then to trailing edge 94, then to top edge 96 and finally to leading edge 98. Spacer is applied while the spacer applied lite 78 is moving forward on the conveyor line. Spacer applied lite 78 and topping lite 80 are then transported via following queue station 64 optionally to driven grid station 66 and then to second queue station 68. Spacer applied lites 78 and topping lites 80 are then conveyed to gas press and fill station 70 which according to alternate embodiments of the invention may include double gas press 108 or single gas press 110. In either case, topping lites 80 are transferred to the front of the gas press and fill station 70 and are mated with spacer applied lite 78 while gas filling takes place. This creates an insulated glass unit that has been primarily sealed. The insulated glass unit is then transported to secondary edge sealer 72 which applies secondary edge sealant via two edge sealing heads including first edge sealing head 144 and second edge sealing head 146. First edge sealing head 144 applies secondary sealant to leading edge 98, top edge 96 and trailing edge 94 of the insulated glass unit in that sequence. Simultaneously, second edge sealing head 146 applies secondary edge sealant to bottom edge 92. During the secondary edge sealing process, edge sealant is wiped at the corners by first corner wiper 152 and second corner wiper 154. Completed insulated glass units having been secondarily edge sealed are then conveyed to non-driven outfeed queue station 74.

[0157] According to the embodiment depicted in FIGS. 16-24 when spacer applied lite 78 arrives at single seal IGU spacer applicator 166 single seal spacer material is applied to spacer applied lite 78 along bottom edge 92 followed by trailing edge 94 followed by top edge 96 and leading edge 98 in sequence. The fourth corner of spacer applied light where leading edge 98 and bottom edge 92 meet is left slightly open.

[0158] Spacer applied lite 78 is conveyed to press and seal unit 174 where topping lite 80 is mated to spacer applied lite 78 to create an IGU. The IGU is conveyed to heating station 176 where eight edges of the IGU are heated to increase wettability of the single seal IGU spacer adhesive. If infrared heating units 192 are moveable they are moved to heat areas of the IGU as required. The IGU is then conveyed to vertical press 178 where the IGU is pressed to enhance the seal between the lites and the single seal spacer material. The fourth corner of the IGU remains open after application of vertical press 178.

[0159] The IGU is then conveyed to fourth corner sealer 180 where the fourth corner is sealed trapping a non air filling gas within the IGU. If present, fourth corner heater 256 may be applied to raise the temperature of the fourth corner to facilitate sealing.

[0160] The present invention may be embodied in other specific forms without departing from the spirit of the essential attributes thereof; therefore, the illustrated embodiments should be considered in all respects as illustrative and not restrictive, reference being made to the appended claims rather than to the foregoing description to indicate the scope of the invention.