US20040045501A1 - Method and apparatus for extrusion coating of fluorescent light tubes - Google Patents
Method and apparatus for extrusion coating of fluorescent light tubes Download PDFInfo
- Publication number
- US20040045501A1 US20040045501A1 US10/238,696 US23869602A US2004045501A1 US 20040045501 A1 US20040045501 A1 US 20040045501A1 US 23869602 A US23869602 A US 23869602A US 2004045501 A1 US2004045501 A1 US 2004045501A1
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- United States
- Prior art keywords
- coating
- light tubes
- light
- end caps
- conveying
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/001—General methods for coating; Devices therefor
- C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
- C03C17/005—Coating the outside
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/50—Auxiliary parts or solid material within the envelope for reducing risk of explosion upon breakage of the envelope, e.g. for use in mines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/46—Machines having sequentially arranged operating stations
Definitions
- the present invention relates to coating fluorescent light tubes with a molten thermo-plastic material to form a plastic sheath or sleeve to contain glass shards in the event the light tube is broken or shattered.
- a fluorescent light tube includes, among other things, and insofar as pertinent to the present invention, a generally cylindrically shaped glass envelope and end caps provided at either end of the glass envelope. Electrical connecting pins are provided on the end caps to connect the light tube to an electrical power source.
- U.S. Pat. No. 5,532,549 teaches coating light tubes by attaching adapters to the end caps and, using these adapters, rotating the light tubes on the surface of a bath containing the coating material. To ensure complete coverage, the light tube must maintain contact with the surface of the bath throughout the coating process.
- U.S. Pat. No. 4,507,332 teaches coating light tubes by exposing the glass envelop and a portion of the end caps to a fluidized bed of powdered polymeric material and heating the light tube above the melting temperature of the polymeric material to melt and fuse the powder onto the glass envelop and end caps to form the coating on the light tube. Heating the entire light tube, though, risks loosening the adhesive attaching the end caps to the glass envelope, thus compromising the integrity of the light tube.
- the present invention provides a method for coating fluorescent light tubes without the difficulties of previous methods as those discussed above.
- the fluorescent light tubes comprise, externally, a hollow glass cylinder sealed on each end by metal end caps.
- the metal end caps act as both a connection to an electrical power supply for the light tube and also to maintain the structural integrity of the light tube.
- light tubes are fed through an extruder and coated with a molten thermo-plastic material.
- the thermo-plastic material adheres to a portion of the end caps such that when cooled, the coating and end caps form a sealed sheath around the glass envelope. This adherence of the thermo-plastic material to the end caps, instead of to the glass envelope, ensures the containment of any glass shards within the sealed sheath if the light tube is broken.
- the end caps include electrically conductive pins. These pins generally extend from the end caps in parallel alignment to the longitudinal axis of the glass envelope. The pins are inserted into a light receptacle and conduct electricity from the receptacle to the light tube as well as supporting the light tube within the light receptacle. Thus, the pins must remain free of coating material.
- three avenues are available to address the need to keep the coating material from contacting the pins: 1) cover the pins during coating; 2) clean the pins after coating; and 3) coat the light tubes in such a manner that prevents the coating from contacting the pins without the need to cover the pins while ensuring that the coating is applied evenly and adheres to the end caps.
- Covering the pins requires the use of either a disposable cover or a cover capable of being removed, cleaned of the coating material and reused. Further, because the coating is applied to both the light tube and the cover, removing the cover may tear, stretch, or otherwise damage the coating on the light tube, rendering the coating ineffectual. Finally, the covers must be aligned to fit around the pins snugly or else the coating material may seep around the cover and contact the pins. Thus, using a cover to protect the pins is undesirable. Likewise, cleaning the pins after coating is also undesirable because of the risk of damage to the pins and the coating, as well as the time required to ensure each pin is completely free of the coating material. Thus, the desirable choice is to coat the light tubes with an extruder in such a manner as to ensure complete application of the coating material while eliminating the need to protect the pins during the coating process.
- the method of the present invention comprises coating the light tubes with molten thermo-plastic material as the light tubes are fed, sequentially, through a cross head extruder.
- the end caps of the light tubes Prior to entering the cross head extruder, the end caps of the light tubes are heated. The pre-heating is performed to ensure that the coating adheres to the end caps and not to the glass cylinder so that, if broken, the end caps and the coating contain all of the glass shards.
- the light tubes are then conveyed, sequentially and in longitudinal alignment with one another, to the cross head extruder. A coating of molten thermo-plastic material is extruded about each light tube.
- a vacuum is applied in the extruder to evacuate air from between each light tube and the coating to promote direct intimate contract of the coating with each light tube. Gaps are formed between each sequentially fed light tube and these gaps are also coated as the sequential light tubes are fed continuously through the extruder.
- the chain of now coated light tubes and gaps are cooled to below the softening temperature of the thermo-plastic material.
- each light tube is separated from the chain of light tubes. This may be done in a variety of ways either by manual manipulation or by use of an automatic device. The separated light tubes are then conveyed to a finishing station where the end caps of the light tubes may be trimmed of excess coating, labeled, inspected and readied for packaging.
- FIG. 1 is a plan view illustrating one design of a fluorescent light tube.
- FIG. 2 is a schematic of the apparatus and method of the present invention.
- FIG. 3 is an expanded drawing of the vacuum assembly attached to the cross head extruder.
- fluorescent light tubes 15 comprise a glass envelope 13 having end caps 11 attached to opposing ends of the glass envelope 13 . Electrically conductive pins 9 extend from at least one end cap 11 .
- apparatus 40 for coating light tubes 15 comprises a heating table 50 , a cross head extruder 65 with a vacuum assembly 70 attached thereto, and a control unit 100 connected therewith and controlling individual steps of the coating process.
- the apparatus 40 also includes a cooling station 75 , a cutting station 85 , and a finishing station 95 .
- An entrance conveyor system 55 disposed between the heating table 50 and the cross head extruder 65 , impels the light tubes 15 sequentially, in longitudinal alignment with one another from the heating table 50 to the cross head extruder 65 .
- An exit conveyor system 80 disposed between the cooling station 75 and the cutting station 85 further impels the light tubes 15 sequentially to the cutting station 85 after the light tubes 15 have been coated and the coating has been cooled.
- An accelerating system 90 located after the cutting station 85 , conveys the light tubes 15 to the finishing station 95 .
- a passive conveying system maintains the light tubes 15 in proper alignment while traveling through the apparatus 40 .
- the heating table 50 comprises infra-red panels arranged to heat the end caps 11 of a plurality of light tubes 15 .
- Infra-red panels are known by those of the coating art and are used extensively with fluidized bed type coatings.
- the infra-red panels are preferably controlled by the control unit 100 .
- Cross head extruders have been used for coating articles that do not have voids or gaps therein, such as wire and cable.
- a die within the cross head extruder 65 of the present invention conforms to the cross-section of the light tubes 15 and regulates the coating thickness.
- the cross head extruder 65 is connected to a vacuum hopper loader (not shown) through which is received the thermo-plastic material, typically in pellet form.
- the thermo-plastic material is plastized in the extruder 60 and applied to the light tubes 15 via the cross head 65 .
- the vacuum assembly 70 attached to the cross head extruder 65 applies a vacuum during extrusion, thus evacuating air from between each light tube 15 and the molten thermo-plastic material, thus drawing the molten thermo-plastic material into direct intimate contract with each light tube 15 .
- the vacuum combines with the length of gap 17 between sequential light tubes 15 to prevent the molten thermo-plastic material from contacting the pins 9 on the end caps 11 of the light tubes 15 .
- the vacuum hopper, extruder 60 , cross head 65 and vacuum assembly 70 are preferably controlled by the control unit 100 .
- the vacuum assembly 70 comprises a first vacuum array 710 connected with a second vacuum array 760 , which is in direct communication with the cross head extruder 65 .
- the first vacuum array 710 comprises an entrance seal plate 720 attached to an entrance of a vacuum chamber 740 .
- a high temperature seal 730 disposed between the entrance seal plate 720 and the vacuum chamber 740 provides an air tight seal therebetween.
- a vacuum supply 750 preferably a vacuum pump (not shown) is attached to the vacuum chamber 740 .
- An exit flange 745 of the vacuum chamber 740 of the first vacuum array 710 connects to an entrance flange 775 the second vacuum array 760 .
- a high temperature seal 765 disposed between the exit flange 745 and the entrance flange 775 provides an air tight seal therebetween.
- the second vacuum array comprises the entrance flange 775 and a vacuum chamber 770 attached to a vacuum supply 780 , preferably a vacuum pump (not shown).
- the vacuum chamber 770 of the second vacuum array 760 is attached to the cross head extruder 65 in a direct, fluid connection.
- a light tube 15 enters the vacuum assembly 70 through the entrance seal plate 720 , travels trough the first vacuum array 710 and the second vacuum array 760 , and enters the cross head extruder 65 .
- the vacuum applied in the vacuum assembly 70 evacuates air around the light tube 15 , promoting a direct and intimate contact between the light tube 15 and the thermo-plastic material extruded about the light tube 15 within the cross heat 65 .
- the cooling station 75 cools the coating on the newly coated light tubes 15 and gaps 17 to below the softening temperature of the coating, thus permitting additional manipulation of the light tubes 15 in a timely fashion.
- the cooling of the coating also prevents the coating from turning opaque, which adversely impacts the brightness of the light tubes while in use.
- the cooling station 75 comprises a water bath, an air cooling system, or a combination thereof.
- the cooling station 75 comprises a water bath capable of providing a constant supply of chilled water to cool the coating on the light tubes 15 .
- the cooling station 75 may be controlled manually or, preferably, be controlled by the control unit 100 .
- the cutting station 85 separates individual light tubes 15 from the chain formed by the continuous coating of sequentially fed light tubes 15 by severing the coating encircling the gaps 17 formed between the light tubes 15 .
- the cutting station 85 comprises a cutting tool.
- the cutting tool comprises a shearing system, hot wire, shears, knives, or a combination thereof, and may be manually or automatically actuated.
- the cutting tool is a shearing system that melts or otherwise slices through the coating encircling the gaps 17 .
- the cutting station 85 is preferably controlled by the control unit 100 .
- the accelerating system 90 comprises a series of drive wheels operated independently of and at a greater travel rate than the entrance and exit conveying systems 55 , 80 .
- the accelerating system 90 provides a burst of speed to the separated light tubes 15 , quickly impelling the light tubes 15 to the finishing station 95 .
- the sudden increase in travel rate of the light tubes 15 also ensures that the separation of the light tubes 15 is complete after exiting the cutting station 85 .
- the accelerating system 90 is preferably controlled by the control unit 100 .
- the finishing station 95 comprises a trimmer tool and a labeling tool.
- the trimmer tool is used to remove the remnants of the severed coatings encircling the gaps 17 from the end caps 11 , thus providing clean edges on the end caps 11 to protect the integrity of the coating adhered to the end caps 11 and to allow the light tubes 15 to be easily fitted into a light receptacle for use.
- the trimmer tool comprises a hot wire, shears, knives, razors or a combination thereof.
- the trimmer tool may be manually manipulated or, preferably, controlled by the control unit 100 .
- the labeling tool places a label on the coating and is comprised, preferably of an ink jet type printing system.
- the labeling tool may be manually or automatically actuated.
- the labeling tool is controlled by the control unit 100 .
- the entrance and exit conveyor systems 55 , 80 comprise a series of indexed drive wheels controlled by the control unit 100 .
- the indexing of the drive wheels is regulated by encoders and servos connected to each of the entrance and exit conveyor systems 55 , 80 .
- the entrance and exit conveyor systems 55 , 80 are synchronized to ensure a consistent travel rate is maintained for the light tubes 15 undergoing the coating process.
- the passive conveyor system (not shown) comprises a series of non-driven wheels spaced along the travel path of the light tubes 15 undergoing the coating process and is used to direct the light tubes 15 on the travel path.
- the method of the present invention begins by placing a plurality of light tubes 15 upon the heating table 50 .
- the end caps 11 of each of the plurality of light tubes 15 are heated before the plurality of light tubes 15 engage the entrance conveyor system 55 .
- the entrance conveyor system 55 impels the plurality of light tubes 15 sequentially and in longitudinal alignment with one another toward the cross head extruder 65 .
- the sequential light tubes 15 are continuously fed to the cross head extruder 65 by the entrance conveyor system 55 .
- Each light tube 15 is coated with a molten thermo-plastic material while a vacuum is applied to evacuate air from between each light tube 15 and the coating to promote direct intimate contract of the coating with each light tube 15 .
- the sequential feeding of light tubes 15 and the longitudinal alignment thereof creates gaps 17 between each of the light tubes 15 .
- the gaps 17 are also coated as the sequential light tubes 15 are fed continuously through the cross head extruder 65 , thus creating a chain of coated light tubes 15 connected by the coated gaps 17 .
- the coated light tubes 15 and gaps 17 Upon exiting the cross head extruder 65 , the coated light tubes 15 and gaps 17 immediately enter the cooling station 75 wherein the light tubes 15 and gaps 17 are passed through a water bath of circulating chilled water, cooling the coating to below the softening temperature of the thermo-plastic material.
- the exit conveyor system 80 impels the chain of coated light tubes 15 and gaps 17 to the cutting station 85 .
- a shearing system severs the coating encircling the gaps 17 between the light tubes 15 , thus separating individual light tubes 15 from the chain of coated light tubes 15 .
- the individual light tubes 15 are then quickly moved away from the chain of coated light tubes 15 by the accelerating system 90 , which speedily impels the individual coated light tubes 15 to the finishing station 95 .
- the individual coated light tubes 15 are trimmed of excess coating and labeled. The light tubes 15 may then be inspected and readied for packaging.
- the coating applied to the light tubes 15 by the cross head extruder 65 is maintained within a desirable thickness range to ensure that the light tubes 15 are completely covered by a consistent thickness of thermo-plastic material.
- the thickness may vary from about 10 mil to about 22 mil, preferably between about 14 mil and about 20 mil, and more preferably between about 16 mil and 18 mil.
- the gaps 17 between the sequential light tubes 15 are maintained at a desired length to ensure that each light tube 15 is coated without interference from a preceding or succeeding light tube 15 and to prevent the coating from contacting the pins 9 of the end caps 11 of the light tube 15 .
- the length of the gaps 17 may be regulated by adjusting the travel rate of the light tubes 15 undergoing the coating process.
- the gaps 17 have a length of between about 0.5 inch and 2.5 inches, preferably between about 1.0 inch and about 2.0 inch, and more preferably about 1.5 inch.
- the travel rate of the light tubes 15 is regulated by adjusting the speed of the series of indexed drive wheels of the entrance and exit conveyor systems 55 , 80 .
- the travel rate of the light tubes 15 is preferably between about 16 ft/min and 60 ft/min.
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Abstract
A method and apparatus for coating the glass envelope and portions of the end caps of fluorescent light tubes in a continuous and sequential manner with a thermo-plastic material. The coating is applied by a cross head extruder through which the light tubes are sequentially fed. A vacuum applied during the coating process promotes direct and intimate contact between the coating and the light tubes. The end caps may be heated prior to coating to ensure adherence of the coating to the end caps and not to the glass envelope. Post-coating processes include cooling the coating, severing individual light tubes from the chain of sequentially coated light tubes, and readying the coated light tubes for packaging. The method is automatic, with the apparatus being automatically controlled by a control unit.
Description
- The present invention relates to coating fluorescent light tubes with a molten thermo-plastic material to form a plastic sheath or sleeve to contain glass shards in the event the light tube is broken or shattered.
- A fluorescent light tube includes, among other things, and insofar as pertinent to the present invention, a generally cylindrically shaped glass envelope and end caps provided at either end of the glass envelope. Electrical connecting pins are provided on the end caps to connect the light tube to an electrical power source.
- As is known to those skilled in the fluorescent light tube art, a light tube is subject to breakage if dropped or released from any appreciable height or if the light tube is struck by another object. Upon breakage, the glass envelope shatters into numerous glass shards, posing a threat of injury to bystanders or anyone attempting to handle the broken light tube. Thus, there has existed a need to apply a coating to fluorescent light tubes which upon the glass envelope being shattered will maintain the end caps in association with the light tube and contain the glass shards between the end caps.
- Providing a protective assembly or coating over the exterior of fluorescent light tubes for protecting the light tubes from impact and for retaining glass fragments and debris are known, for example in U.S. Pat. No. 5,536,998, which utilizes a pre-formed semi-rigid transparent tube surrounding the glass envelope and held in place by heat shrinkable material heat shrunk to a portion of the end caps and extending over the pre-formed tube. The pre-formed protective tube is of sufficient internal diameter to allow a uniform air space to form between the protective tube and the glass envelope. The disadvantage of this process is the need to select two different yet compatible materials and provide a means for forming the uniform air space between the protective tube and the glass envelope.
- U.S. Pat. No. 5,532,549 teaches coating light tubes by attaching adapters to the end caps and, using these adapters, rotating the light tubes on the surface of a bath containing the coating material. To ensure complete coverage, the light tube must maintain contact with the surface of the bath throughout the coating process.
- U.S. Pat. No. 4,507,332 teaches coating light tubes by exposing the glass envelop and a portion of the end caps to a fluidized bed of powdered polymeric material and heating the light tube above the melting temperature of the polymeric material to melt and fuse the powder onto the glass envelop and end caps to form the coating on the light tube. Heating the entire light tube, though, risks loosening the adhesive attaching the end caps to the glass envelope, thus compromising the integrity of the light tube.
- Other methods of coating glass envelops include dipping the envelop in a lacquer coating material (U.S. Pat. No. 3,959,525), and spraying silicone coatings onto glass envelops (U.S. Pat. No. 3,902,946). Although adaptable to “batch” type processing, i.e., applying a coating onto several light tubes at one time, these processes require each light tube be attached to an individual manipulator or adapter before undergoing the coating process, thus making the processes slow.
- The present invention provides a method for coating fluorescent light tubes without the difficulties of previous methods as those discussed above. The fluorescent light tubes comprise, externally, a hollow glass cylinder sealed on each end by metal end caps. The metal end caps act as both a connection to an electrical power supply for the light tube and also to maintain the structural integrity of the light tube. By the present invention, light tubes are fed through an extruder and coated with a molten thermo-plastic material. The thermo-plastic material adheres to a portion of the end caps such that when cooled, the coating and end caps form a sealed sheath around the glass envelope. This adherence of the thermo-plastic material to the end caps, instead of to the glass envelope, ensures the containment of any glass shards within the sealed sheath if the light tube is broken.
- The end caps include electrically conductive pins. These pins generally extend from the end caps in parallel alignment to the longitudinal axis of the glass envelope. The pins are inserted into a light receptacle and conduct electricity from the receptacle to the light tube as well as supporting the light tube within the light receptacle. Thus, the pins must remain free of coating material. When using an extruder to coat the light tubes, three avenues are available to address the need to keep the coating material from contacting the pins: 1) cover the pins during coating; 2) clean the pins after coating; and 3) coat the light tubes in such a manner that prevents the coating from contacting the pins without the need to cover the pins while ensuring that the coating is applied evenly and adheres to the end caps. Covering the pins requires the use of either a disposable cover or a cover capable of being removed, cleaned of the coating material and reused. Further, because the coating is applied to both the light tube and the cover, removing the cover may tear, stretch, or otherwise damage the coating on the light tube, rendering the coating ineffectual. Finally, the covers must be aligned to fit around the pins snugly or else the coating material may seep around the cover and contact the pins. Thus, using a cover to protect the pins is undesirable. Likewise, cleaning the pins after coating is also undesirable because of the risk of damage to the pins and the coating, as well as the time required to ensure each pin is completely free of the coating material. Thus, the desirable choice is to coat the light tubes with an extruder in such a manner as to ensure complete application of the coating material while eliminating the need to protect the pins during the coating process.
- Basically, the method of the present invention comprises coating the light tubes with molten thermo-plastic material as the light tubes are fed, sequentially, through a cross head extruder. Prior to entering the cross head extruder, the end caps of the light tubes are heated. The pre-heating is performed to ensure that the coating adheres to the end caps and not to the glass cylinder so that, if broken, the end caps and the coating contain all of the glass shards. The light tubes are then conveyed, sequentially and in longitudinal alignment with one another, to the cross head extruder. A coating of molten thermo-plastic material is extruded about each light tube. A vacuum is applied in the extruder to evacuate air from between each light tube and the coating to promote direct intimate contract of the coating with each light tube. Gaps are formed between each sequentially fed light tube and these gaps are also coated as the sequential light tubes are fed continuously through the extruder. Upon exiting from the extruder, the chain of now coated light tubes and gaps are cooled to below the softening temperature of the thermo-plastic material. After cooling, each light tube is separated from the chain of light tubes. This may be done in a variety of ways either by manual manipulation or by use of an automatic device. The separated light tubes are then conveyed to a finishing station where the end caps of the light tubes may be trimmed of excess coating, labeled, inspected and readied for packaging.
- FIG. 1 is a plan view illustrating one design of a fluorescent light tube.
- FIG. 2 is a schematic of the apparatus and method of the present invention.
- FIG. 3 is an expanded drawing of the vacuum assembly attached to the cross head extruder.
- Referring to FIG. 1, and for the purposes of this invention,
fluorescent light tubes 15 comprise aglass envelope 13 havingend caps 11 attached to opposing ends of theglass envelope 13. Electricallyconductive pins 9 extend from at least oneend cap 11. Referring to FIG. 2,apparatus 40 forcoating light tubes 15 according to the present invention comprises a heating table 50, across head extruder 65 with avacuum assembly 70 attached thereto, and acontrol unit 100 connected therewith and controlling individual steps of the coating process. Preferably, theapparatus 40 also includes acooling station 75, acutting station 85, and afinishing station 95. Anentrance conveyor system 55, disposed between the heating table 50 and thecross head extruder 65, impels thelight tubes 15 sequentially, in longitudinal alignment with one another from the heating table 50 to thecross head extruder 65. Anexit conveyor system 80, disposed between thecooling station 75 and thecutting station 85 further impels thelight tubes 15 sequentially to thecutting station 85 after thelight tubes 15 have been coated and the coating has been cooled. An acceleratingsystem 90, located after thecutting station 85, conveys thelight tubes 15 to thefinishing station 95. A passive conveying system maintains thelight tubes 15 in proper alignment while traveling through theapparatus 40. - The heating table50 comprises infra-red panels arranged to heat the end caps 11 of a plurality of
light tubes 15. Infra-red panels are known by those of the coating art and are used extensively with fluidized bed type coatings. The infra-red panels are preferably controlled by thecontrol unit 100. - Cross head extruders have been used for coating articles that do not have voids or gaps therein, such as wire and cable. A die within the
cross head extruder 65 of the present invention conforms to the cross-section of thelight tubes 15 and regulates the coating thickness. Thecross head extruder 65 is connected to a vacuum hopper loader (not shown) through which is received the thermo-plastic material, typically in pellet form. The thermo-plastic material is plastized in theextruder 60 and applied to thelight tubes 15 via thecross head 65. Thevacuum assembly 70 attached to thecross head extruder 65 applies a vacuum during extrusion, thus evacuating air from between eachlight tube 15 and the molten thermo-plastic material, thus drawing the molten thermo-plastic material into direct intimate contract with eachlight tube 15. The vacuum combines with the length of gap 17 between sequentiallight tubes 15 to prevent the molten thermo-plastic material from contacting thepins 9 on the end caps 11 of thelight tubes 15. The vacuum hopper,extruder 60,cross head 65 andvacuum assembly 70 are preferably controlled by thecontrol unit 100. - One embodiment of the
vacuum assembly 70 is shown in greater detail in FIG. 3. Thevacuum assembly 70 comprises afirst vacuum array 710 connected with asecond vacuum array 760, which is in direct communication with thecross head extruder 65. Thefirst vacuum array 710 comprises anentrance seal plate 720 attached to an entrance of avacuum chamber 740. Ahigh temperature seal 730 disposed between theentrance seal plate 720 and thevacuum chamber 740 provides an air tight seal therebetween. Avacuum supply 750, preferably a vacuum pump (not shown) is attached to thevacuum chamber 740. An exit flange 745 of thevacuum chamber 740 of thefirst vacuum array 710 connects to anentrance flange 775 thesecond vacuum array 760. A high temperature seal 765 disposed between the exit flange 745 and theentrance flange 775 provides an air tight seal therebetween. The second vacuum array comprises theentrance flange 775 and avacuum chamber 770 attached to avacuum supply 780, preferably a vacuum pump (not shown). Thevacuum chamber 770 of thesecond vacuum array 760 is attached to thecross head extruder 65 in a direct, fluid connection. Alight tube 15 enters thevacuum assembly 70 through theentrance seal plate 720, travels trough thefirst vacuum array 710 and thesecond vacuum array 760, and enters thecross head extruder 65. The vacuum applied in thevacuum assembly 70 evacuates air around thelight tube 15, promoting a direct and intimate contact between thelight tube 15 and the thermo-plastic material extruded about thelight tube 15 within thecross heat 65. - The
cooling station 75 cools the coating on the newly coatedlight tubes 15 and gaps 17 to below the softening temperature of the coating, thus permitting additional manipulation of thelight tubes 15 in a timely fashion. The cooling of the coating also prevents the coating from turning opaque, which adversely impacts the brightness of the light tubes while in use. Thecooling station 75 comprises a water bath, an air cooling system, or a combination thereof. Preferably, thecooling station 75 comprises a water bath capable of providing a constant supply of chilled water to cool the coating on thelight tubes 15. Thecooling station 75 may be controlled manually or, preferably, be controlled by thecontrol unit 100. - The cutting
station 85 separatesindividual light tubes 15 from the chain formed by the continuous coating of sequentially fedlight tubes 15 by severing the coating encircling the gaps 17 formed between thelight tubes 15. The cuttingstation 85 comprises a cutting tool. The cutting tool comprises a shearing system, hot wire, shears, knives, or a combination thereof, and may be manually or automatically actuated. Preferably, the cutting tool is a shearing system that melts or otherwise slices through the coating encircling the gaps 17. The cuttingstation 85 is preferably controlled by thecontrol unit 100. - The accelerating
system 90 comprises a series of drive wheels operated independently of and at a greater travel rate than the entrance and exit conveyingsystems system 90 provides a burst of speed to the separatedlight tubes 15, quickly impelling thelight tubes 15 to the finishingstation 95. The sudden increase in travel rate of thelight tubes 15 also ensures that the separation of thelight tubes 15 is complete after exiting the cuttingstation 85. The acceleratingsystem 90 is preferably controlled by thecontrol unit 100. - The finishing
station 95 comprises a trimmer tool and a labeling tool. The trimmer tool is used to remove the remnants of the severed coatings encircling the gaps 17 from the end caps 11, thus providing clean edges on the end caps 11 to protect the integrity of the coating adhered to the end caps 11 and to allow thelight tubes 15 to be easily fitted into a light receptacle for use. The trimmer tool comprises a hot wire, shears, knives, razors or a combination thereof. The trimmer tool may be manually manipulated or, preferably, controlled by thecontrol unit 100. The labeling tool places a label on the coating and is comprised, preferably of an ink jet type printing system. The labeling tool may be manually or automatically actuated. Preferably, the labeling tool is controlled by thecontrol unit 100. - The entrance and
exit conveyor systems control unit 100. The indexing of the drive wheels is regulated by encoders and servos connected to each of the entrance andexit conveyor systems exit conveyor systems light tubes 15 undergoing the coating process. - The passive conveyor system (not shown) comprises a series of non-driven wheels spaced along the travel path of the
light tubes 15 undergoing the coating process and is used to direct thelight tubes 15 on the travel path. - The method of the present invention, utilizing the
apparatus 40 discussed above begins by placing a plurality oflight tubes 15 upon the heating table 50. The end caps 11 of each of the plurality oflight tubes 15 are heated before the plurality oflight tubes 15 engage theentrance conveyor system 55. Theentrance conveyor system 55 impels the plurality oflight tubes 15 sequentially and in longitudinal alignment with one another toward thecross head extruder 65. Thesequential light tubes 15 are continuously fed to thecross head extruder 65 by theentrance conveyor system 55. Eachlight tube 15 is coated with a molten thermo-plastic material while a vacuum is applied to evacuate air from between eachlight tube 15 and the coating to promote direct intimate contract of the coating with eachlight tube 15. The sequential feeding oflight tubes 15 and the longitudinal alignment thereof creates gaps 17 between each of thelight tubes 15. The gaps 17 are also coated as thesequential light tubes 15 are fed continuously through thecross head extruder 65, thus creating a chain ofcoated light tubes 15 connected by the coated gaps 17. Upon exiting thecross head extruder 65, thecoated light tubes 15 and gaps 17 immediately enter thecooling station 75 wherein thelight tubes 15 and gaps 17 are passed through a water bath of circulating chilled water, cooling the coating to below the softening temperature of the thermo-plastic material. Theexit conveyor system 80 impels the chain ofcoated light tubes 15 and gaps 17 to the cuttingstation 85. There, a shearing system severs the coating encircling the gaps 17 between thelight tubes 15, thus separatingindividual light tubes 15 from the chain ofcoated light tubes 15. Theindividual light tubes 15 are then quickly moved away from the chain ofcoated light tubes 15 by the acceleratingsystem 90, which speedily impels the individual coatedlight tubes 15 to the finishingstation 95. At the finishingstation 95, the individual coatedlight tubes 15 are trimmed of excess coating and labeled. Thelight tubes 15 may then be inspected and readied for packaging. - The coating applied to the
light tubes 15 by thecross head extruder 65 is maintained within a desirable thickness range to ensure that thelight tubes 15 are completely covered by a consistent thickness of thermo-plastic material. The thickness may vary from about 10 mil to about 22 mil, preferably between about 14 mil and about 20 mil, and more preferably between about 16 mil and 18 mil. - The gaps17 between the
sequential light tubes 15 are maintained at a desired length to ensure that eachlight tube 15 is coated without interference from a preceding or succeedinglight tube 15 and to prevent the coating from contacting thepins 9 of the end caps 11 of thelight tube 15. The length of the gaps 17 may be regulated by adjusting the travel rate of thelight tubes 15 undergoing the coating process. The gaps 17 have a length of between about 0.5 inch and 2.5 inches, preferably between about 1.0 inch and about 2.0 inch, and more preferably about 1.5 inch. - The travel rate of the
light tubes 15 is regulated by adjusting the speed of the series of indexed drive wheels of the entrance andexit conveyor systems light tubes 15 is preferably between about 16 ft/min and 60 ft/min. - It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.
Claims (55)
1. A method of coating an article having opposing ends, the method comprising the steps:
a) loading the article on a coating conveyor system;
b) feeding the article to a coating station, which includes an article coating machine;
c) applying a coating to the article at the coating station; and
d) conveying said article to a stacking and/or packaging station.
2. A method according to claim 1 further comprising removing excess coating from the ends of the article.
3. A method according to claim 1 , further comprising loading a plurality of articles on the coating conveyor system to form a chain of articles with gaps therebetween.
4. A method according to claim 3 , further comprising applying the coating to the chain of articles and gaps.
5. A method according to claim 4 , further comprising separating each article from the chain after the coating step.
6. A method according to claim 4 , further comprising cooling the chain after the coating step.
7. A method according to claim 1 , further comprising applying a vacuum during the coating step.
8. A method according to claim 1 , further comprising preheating a portion of said article before the loading step.
9. A method according to claim 1 wherein the coating step further comprises extruding a molten thermo-plastic material.
10. A method for coating fluorescent light tubes having opposing end caps, the method comprising the steps:
a) conveying the plurality of light tubes sequentially in longitudinal alignment with one another; and
b) extruding a coating of molten thermo-plastic material about each light tube substantially in direct intimate contact with each light tube.
11. The method according to claim 10 , further comprising cooling the coating below the softening temperature of the thermo-plastic material after the coating step.
12. The method according to claim 10 , further comprising heating the end caps of the plurality of light tubes before the conveying step.
13. The method according to claim 10 , further comprising applying a vacuum during the extruding step.
14. The method according to claim 12 , wherein the step of heating the end caps comprises applying an infra-red heater to the end caps.
15. The method according to claim 10 , wherein the step of conveying the plurality of light tubes comprises impelling each light tube in advance of the extruding step and impelling each light tube following the cooling step.
16. The method according to claim 11 , wherein the cooling step comprises applying a coolant to the light tubes.
17. The method according to claim 16 , wherein the cooling step comprises applying a water bath to the light tubes.
18. The method according to claim 16 , wherein the cooling step comprises applying air to the light tubes.
19. The method according to claim 10 , wherein the extruding step comprising extruding a continuous coating of molten thermo-plastic material thereby connecting sequentially coated light tubes.
20. The method according to claim 19 further comprising separating the continuous coating between the end caps of sequential light tubes.
21. The method according to claim 20 , wherein the separating step comprises applying a cutting tool to the continuous coating between the end caps of sequential light tubes.
22. The method according to claim 20 , further comprising accelerating each light tube to effect separation between sequential light tubes.
23. The method according to claim 10 , further comprising trimming excess coating from the end caps of the light tubes and labeling the light tubes.
24. The method according the claim 10 , further comprising automatically controlling the conveying and feeding steps via a controller
25. The method according the claim 12 , further comprising automatically controlling the heating, conveying, and feeding steps via a controller.
26. The method according the claim 11 , further comprising automatically controlling the conveying, feeding, and cooling steps via a controller.
27. The method according the claim 20 , further comprises automatically controlling the conveying, feeding, and separating steps via a controller.
28. The method according the claim 22 , further comprises automatically controlling the conveying, feeding, separating, and accelerating steps via a controller.
29. The method according the claim 23 , further comprises automatically controlling the conveying, feeding, trimming and labeling steps via a controller.
30. The method according to claim 10 , wherein the coating step further comprises maintaining a uniform thickness of the molten thermo-plastic material encircling the light tubes to between about 10 mil and about 22 mil.
31. The method according to claim 30 , wherein the coating step further comprises maintaining a uniform thickness of the molten thermo-plastic material encircling the light tubes to between about 14 mil and about 20 mil.
32. The method according to claim 30 , wherein the coating step further comprises maintaining a uniform thickness of the molten thermo-plastic material encircling the light tubes to between about 16 mil and about 18 mil.
33. The method according to claim 10 , wherein the conveying step comprises maintaining the end caps of sequential light tubes at a spaced interval between about 0.5 inch and about 2.5 inches.
34. The method according to claim 33 , wherein the conveying step comprises maintaining the end caps of sequential light tubes at a spaced interval between about 1.0 inch and about 2.0 inches.
35. The method according to claim 33 , wherein the conveying step comprises maintaining the end caps of sequential light tubes at a spaced interval of about 1.5 inch.
36. The method according to claim 10 , further comprising the step of adjusting a rate of travel of the light tubes by regulating the conveying step.
37. The method according to claim 36 , wherein the adjusting step comprises maintaining the travel rate at between about 16 ft/min and about 60 ft/min.
38. A method for coating fluorescent light tubes having opposing end caps, the method comprising the steps:
a) heating the end caps of a plurality of light tubes;
b) conveying the plurality of light tubes sequentially in longitudinal alignment with one another;
c) extruding a coating of molten thermo-plastic material about each light tube while applying a vacuum to evacuate air from between each light tube and the coating to promote direct intimate contact of the coating with each light tube;
d) cooling the coating below the softening temperature of the thermo-plastic material; and
e) separating each light tube from the plurality of light tubes.
39. The method according to claim 38 , further comprising automatically controlling the heating, conveying, extruding, cooling and separating steps via a controller.
40. The method according to claim 38 , further comprising accelerating each light tube after the separating step.
41. The method according to claim 38 , further comprising trimming excess coating from each light tube after the separating step.
42. The method according to claim 39 , further comprising labeling each light tube.
43. A machine for coating a plurality of fluorescent light tubes comprising:
a) a heating table; and
b) a cross head extruder
wherein the plurality of light tubes is preheated on the heating table before being fed to the cross head extruder.
44. The machine according to claim 43 , further comprising a vacuum assembly attached to the cross head extruder to apply a vacuum therein to promote a direct and intimate contact between the plurality of light tubes and the coating of a molten thermo-plastic material extruded by the cross head extruder.
45. The machine according to claim 43 , wherein the heating table comprises a plurality of infra-red panels.
46. The machine according to claim 43 , further comprising a cooling station disposed adjacent to the cross head extruder for cooling the plurality of light tubes therein.
47. The machine according to claim 46 , wherein the cooling station comprises a chilled water bath.
48. The machine according to claim 46 , wherein the cooling station comprises an air supply.
49. The machine according to claim 46 , further comprising a cutting station for separating the plurality of light tubes, the cutting station disposed adjacent the cooling station.
50. The machine according to claim 49 , wherein the cutting station comprises a cutting tool.
51. The machine according to claim 50 , wherein the cutting station comprises a heated shearing system.
52. The machine according to claim 43 , further comprising an acceleration system to effect separation of the plurality of light tubes.
53. The machine according to claim 43 , further comprising a trimming station for removing excess coating from the plurality of light tubes.
54. The machine according to claim 43 , further comprising a labeling station for labeling the plurality of light tubes.
55. The machine according to claim 43 , further comprising a control unit connected thereto for automatic control thereof.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/238,696 US20040045501A1 (en) | 2002-09-10 | 2002-09-10 | Method and apparatus for extrusion coating of fluorescent light tubes |
MXPA05002736A MXPA05002736A (en) | 2002-09-10 | 2003-09-09 | Method and apparatus for extrusion coating of fluorescent light tubes. |
PCT/US2003/028310 WO2004024345A1 (en) | 2002-09-10 | 2003-09-09 | Method and apparatus for extrusion coating of fluorescent light tubes |
AU2003270479A AU2003270479A1 (en) | 2002-09-10 | 2003-09-09 | Method and apparatus for extrusion coating of fluorescent light tubes |
CA2498398A CA2498398C (en) | 2002-09-10 | 2003-09-09 | Method and apparatus for extrusion coating of fluorescent light tubes |
US10/713,614 US7572479B2 (en) | 2002-09-10 | 2003-11-14 | Method and apparatus for extrusion coating of fluorescent light tubes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/238,696 US20040045501A1 (en) | 2002-09-10 | 2002-09-10 | Method and apparatus for extrusion coating of fluorescent light tubes |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/713,614 Continuation US7572479B2 (en) | 2002-09-10 | 2003-11-14 | Method and apparatus for extrusion coating of fluorescent light tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040045501A1 true US20040045501A1 (en) | 2004-03-11 |
Family
ID=31991015
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/238,696 Abandoned US20040045501A1 (en) | 2002-09-10 | 2002-09-10 | Method and apparatus for extrusion coating of fluorescent light tubes |
US10/713,614 Expired - Fee Related US7572479B2 (en) | 2002-09-10 | 2003-11-14 | Method and apparatus for extrusion coating of fluorescent light tubes |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/713,614 Expired - Fee Related US7572479B2 (en) | 2002-09-10 | 2003-11-14 | Method and apparatus for extrusion coating of fluorescent light tubes |
Country Status (5)
Country | Link |
---|---|
US (2) | US20040045501A1 (en) |
AU (1) | AU2003270479A1 (en) |
CA (1) | CA2498398C (en) |
MX (1) | MXPA05002736A (en) |
WO (1) | WO2004024345A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111473256A (en) * | 2020-04-24 | 2020-07-31 | 嘉兴市加宇电器科技有限公司 | Vacuum sealing device for L ED lamp tube and using method thereof |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006034147A1 (en) * | 2006-07-24 | 2008-01-31 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Light source with saturated light color |
US8152586B2 (en) * | 2008-08-11 | 2012-04-10 | Shat-R-Shield, Inc. | Shatterproof light tube having after-glow |
US8697458B2 (en) | 2009-04-22 | 2014-04-15 | Shat-R-Shield, Inc. | Silicone coated light-emitting diode |
EP2422369A4 (en) * | 2009-04-22 | 2014-12-24 | Shat R Shield Inc | Silicone coated light-emitting diode |
US11056625B2 (en) | 2018-02-19 | 2021-07-06 | Creeled, Inc. | Clear coating for light emitting device exterior having chemical resistance and related methods |
Citations (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706691A (en) * | 1949-05-18 | 1955-04-19 | Osram G M B H Kommanditgesells | Method of coating glass bulbs |
US3377494A (en) * | 1965-05-24 | 1968-04-09 | Westinghouse Electric Corp | Fluorescent lamp envelope with transparent protective coatings |
US3453162A (en) * | 1966-01-10 | 1969-07-01 | Continental Can Co | Method of and apparatus for lining paper containers |
US3471317A (en) * | 1965-08-25 | 1969-10-07 | Dow Chemical Co | Process for coating glass electronic vacuum tubes |
US3621323A (en) * | 1968-07-01 | 1971-11-16 | Thomas Mfg Co | Coated incandescent electric lamp |
US3673401A (en) * | 1969-10-29 | 1972-06-27 | Thermoplastic Processes Inc | Fluorescent lamp protection apparatus |
US3798481A (en) * | 1972-10-20 | 1974-03-19 | Thermoplastic Processes Inc | Fluorescent lamp heat shield |
US3902946A (en) * | 1972-09-11 | 1975-09-02 | Gte Sylvania Inc | Photoflash lamp and method of coating same |
US3932048A (en) * | 1975-01-17 | 1976-01-13 | Thermoplastic Processes, Inc. | Furniture jointing arrangement |
US3947224A (en) * | 1974-11-01 | 1976-03-30 | Gte Sylvania Incorporated | Photoflash lamp with modified polycarbonate coating |
US3959525A (en) * | 1974-06-24 | 1976-05-25 | Gte Sylvania Incorporated | Method of coating photoflash lamp |
US4048537A (en) * | 1976-06-04 | 1977-09-13 | Gte Sylvania Incorporated | Protective ultraviolet-transmitting sleeve for fluorescent lamp |
US4061461A (en) * | 1976-05-10 | 1977-12-06 | Thermoplastice Processes Inc. | Compound extrusion die for producing an internally lined extrudate |
US4065589A (en) * | 1975-06-09 | 1977-12-27 | Owens-Illinois, Inc. | Polymeric coating for protection of glass substrate |
US4198199A (en) * | 1976-12-22 | 1980-04-15 | Gte Sylvania Incorporated | Lamp with protective coating and method of applying same |
US4332329A (en) * | 1977-10-25 | 1982-06-01 | Ppg Industries, Inc. | Implosion coatings |
US4499850A (en) * | 1982-08-02 | 1985-02-19 | Nolan James D | Apparatus for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4506189A (en) * | 1981-10-10 | 1985-03-19 | Nolan James D | Methods of and apparatus for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4507332A (en) * | 1982-08-02 | 1985-03-26 | Nolan James D | Methods for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4633133A (en) * | 1984-11-13 | 1986-12-30 | Gte Products Corporation | Fluorescent lamps having improved lamp spectral output and maintenance and method of making same |
US4804886A (en) * | 1987-01-02 | 1989-02-14 | James D. Nolan | Electric lamp with composite safety coating and process of manufacture |
US4898702A (en) * | 1988-04-04 | 1990-02-06 | Cordis Corporation | Method and apparatus for removal of a wire mandrel from a catheter |
US5034650A (en) * | 1990-05-03 | 1991-07-23 | Nolan James D | Lamp with coating for absorption of ultraviolet light |
US5043626A (en) * | 1990-06-11 | 1991-08-27 | Nolan James D | Fluorescent lamp with composite safety coating and process of manufacture |
US5124618A (en) * | 1989-11-16 | 1992-06-23 | Matsushita Electronics Corporation | Shatter-proof fluorescent lamp |
US5173637A (en) * | 1990-07-19 | 1992-12-22 | Royal Lite Manufacturing And Supply Corp. | Fluorescent lamp with protective assembly |
US5324885A (en) * | 1991-03-22 | 1994-06-28 | Seiko Epson Corporation | Roller member for an electrophotographic device |
US5532549A (en) * | 1993-03-02 | 1996-07-02 | Trojan, Inc. | Coated, labeled fluorescent lamp |
US5536998A (en) * | 1994-11-28 | 1996-07-16 | Royal Lite Manufacturing And Supply Corp. | Fluorescent lamp with a protective assembly |
US5945462A (en) * | 1997-10-02 | 1999-08-31 | Loctite Corporation | Temporary protective coatings for precision surfaces |
US6246167B1 (en) * | 1999-06-29 | 2001-06-12 | Michael F. Sica | U-shaped fluorescent lamp with protective assembly |
US6452325B1 (en) * | 2000-07-24 | 2002-09-17 | Thermoplastic Processes, Inc. | Shatterproofing of fluorescent lamps |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB208827A (en) | 1922-10-07 | 1924-01-03 | Frederick Henry Royce | Improvements in crankshafts |
GB265496A (en) | 1926-10-09 | 1927-02-10 | Eduard Kayser | Snap fastener or press-stud for purses, wallets and the like |
US3706216A (en) * | 1970-12-16 | 1972-12-19 | Joseph L Weingarten | Process for reinforcing extruded articles |
CA1005200A (en) * | 1971-07-16 | 1977-02-08 | Hasbro Industries | Pencil sheath compositions, method and apparatus for making pencils, and the resulting product |
US4077098A (en) * | 1975-04-07 | 1978-03-07 | Nippon Steel Corporation | Apparatus for manufacturing a metallic tube coated with a thermoplastic resin film having little residual strain |
US4952262A (en) * | 1986-05-05 | 1990-08-28 | Parker Hannifin Corporation | Hose construction |
US6043600A (en) * | 1997-09-02 | 2000-03-28 | Royal Lite Manufacturing & Supply Corp. | Curved shatter-resistant lamp assembly and method |
EP1320417B1 (en) * | 2000-08-25 | 2005-02-02 | Fotolec Technologies Plc | Member for linking together articles during coating and according process |
-
2002
- 2002-09-10 US US10/238,696 patent/US20040045501A1/en not_active Abandoned
-
2003
- 2003-09-09 MX MXPA05002736A patent/MXPA05002736A/en active IP Right Grant
- 2003-09-09 AU AU2003270479A patent/AU2003270479A1/en not_active Abandoned
- 2003-09-09 WO PCT/US2003/028310 patent/WO2004024345A1/en not_active Application Discontinuation
- 2003-09-09 CA CA2498398A patent/CA2498398C/en not_active Expired - Fee Related
- 2003-11-14 US US10/713,614 patent/US7572479B2/en not_active Expired - Fee Related
Patent Citations (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706691A (en) * | 1949-05-18 | 1955-04-19 | Osram G M B H Kommanditgesells | Method of coating glass bulbs |
US3377494A (en) * | 1965-05-24 | 1968-04-09 | Westinghouse Electric Corp | Fluorescent lamp envelope with transparent protective coatings |
US3471317A (en) * | 1965-08-25 | 1969-10-07 | Dow Chemical Co | Process for coating glass electronic vacuum tubes |
US3453162A (en) * | 1966-01-10 | 1969-07-01 | Continental Can Co | Method of and apparatus for lining paper containers |
US3621323A (en) * | 1968-07-01 | 1971-11-16 | Thomas Mfg Co | Coated incandescent electric lamp |
US3673401A (en) * | 1969-10-29 | 1972-06-27 | Thermoplastic Processes Inc | Fluorescent lamp protection apparatus |
US3902946A (en) * | 1972-09-11 | 1975-09-02 | Gte Sylvania Inc | Photoflash lamp and method of coating same |
US3798481A (en) * | 1972-10-20 | 1974-03-19 | Thermoplastic Processes Inc | Fluorescent lamp heat shield |
US3959525A (en) * | 1974-06-24 | 1976-05-25 | Gte Sylvania Incorporated | Method of coating photoflash lamp |
US3947224A (en) * | 1974-11-01 | 1976-03-30 | Gte Sylvania Incorporated | Photoflash lamp with modified polycarbonate coating |
US3932048A (en) * | 1975-01-17 | 1976-01-13 | Thermoplastic Processes, Inc. | Furniture jointing arrangement |
US4065589A (en) * | 1975-06-09 | 1977-12-27 | Owens-Illinois, Inc. | Polymeric coating for protection of glass substrate |
US4061461A (en) * | 1976-05-10 | 1977-12-06 | Thermoplastice Processes Inc. | Compound extrusion die for producing an internally lined extrudate |
US4048537A (en) * | 1976-06-04 | 1977-09-13 | Gte Sylvania Incorporated | Protective ultraviolet-transmitting sleeve for fluorescent lamp |
US4198199A (en) * | 1976-12-22 | 1980-04-15 | Gte Sylvania Incorporated | Lamp with protective coating and method of applying same |
US4332329A (en) * | 1977-10-25 | 1982-06-01 | Ppg Industries, Inc. | Implosion coatings |
US4506189A (en) * | 1981-10-10 | 1985-03-19 | Nolan James D | Methods of and apparatus for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4499850A (en) * | 1982-08-02 | 1985-02-19 | Nolan James D | Apparatus for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4507332A (en) * | 1982-08-02 | 1985-03-26 | Nolan James D | Methods for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp |
US4633133A (en) * | 1984-11-13 | 1986-12-30 | Gte Products Corporation | Fluorescent lamps having improved lamp spectral output and maintenance and method of making same |
US4804886A (en) * | 1987-01-02 | 1989-02-14 | James D. Nolan | Electric lamp with composite safety coating and process of manufacture |
US4898702A (en) * | 1988-04-04 | 1990-02-06 | Cordis Corporation | Method and apparatus for removal of a wire mandrel from a catheter |
US5124618A (en) * | 1989-11-16 | 1992-06-23 | Matsushita Electronics Corporation | Shatter-proof fluorescent lamp |
US5034650A (en) * | 1990-05-03 | 1991-07-23 | Nolan James D | Lamp with coating for absorption of ultraviolet light |
US5043626A (en) * | 1990-06-11 | 1991-08-27 | Nolan James D | Fluorescent lamp with composite safety coating and process of manufacture |
US5173637A (en) * | 1990-07-19 | 1992-12-22 | Royal Lite Manufacturing And Supply Corp. | Fluorescent lamp with protective assembly |
US5324885A (en) * | 1991-03-22 | 1994-06-28 | Seiko Epson Corporation | Roller member for an electrophotographic device |
US5532549A (en) * | 1993-03-02 | 1996-07-02 | Trojan, Inc. | Coated, labeled fluorescent lamp |
US5536998A (en) * | 1994-11-28 | 1996-07-16 | Royal Lite Manufacturing And Supply Corp. | Fluorescent lamp with a protective assembly |
US5945462A (en) * | 1997-10-02 | 1999-08-31 | Loctite Corporation | Temporary protective coatings for precision surfaces |
US6246167B1 (en) * | 1999-06-29 | 2001-06-12 | Michael F. Sica | U-shaped fluorescent lamp with protective assembly |
US6452325B1 (en) * | 2000-07-24 | 2002-09-17 | Thermoplastic Processes, Inc. | Shatterproofing of fluorescent lamps |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111473256A (en) * | 2020-04-24 | 2020-07-31 | 嘉兴市加宇电器科技有限公司 | Vacuum sealing device for L ED lamp tube and using method thereof |
Also Published As
Publication number | Publication date |
---|---|
AU2003270479A1 (en) | 2004-04-30 |
CA2498398A1 (en) | 2004-03-25 |
US7572479B2 (en) | 2009-08-11 |
US20040142100A1 (en) | 2004-07-22 |
MXPA05002736A (en) | 2005-09-08 |
WO2004024345A1 (en) | 2004-03-25 |
CA2498398C (en) | 2010-08-31 |
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Legal Events
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AS | Assignment |
Owner name: SHAT-R-SHIELD, INC., NORTH CAROLINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NOLAN, ROBERT J.;CANNON, MARK;REEL/FRAME:013292/0189 Effective date: 20020905 |
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STCB | Information on status: application discontinuation |
Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION |