CA1228285A - Method of and apparatus for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet - Google Patents
Method of and apparatus for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheetInfo
- Publication number
- CA1228285A CA1228285A CA000462745A CA462745A CA1228285A CA 1228285 A CA1228285 A CA 1228285A CA 000462745 A CA000462745 A CA 000462745A CA 462745 A CA462745 A CA 462745A CA 1228285 A CA1228285 A CA 1228285A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- sensitive adhesive
- flexible sheet
- pressure
- release
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Adhesives Or Adhesive Processes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Air nozzle assemblies are provided for stripping the release strips from a laminated pressure-sensitive adhesive strip construction applied to a jacket for pipe insulation.
Air nozzle assemblies are provided for stripping the release strips from a laminated pressure-sensitive adhesive strip construction applied to a jacket for pipe insulation.
Description
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TEC~INICAL_FIELD
This inven~;on relates generally to a flexible sheet having ~wo strips of pressure-sensi~ive adhesive respectively on different portions thereoF, ~he sheet being manipulated to place the strips of adhesive in contac~ with j each other in the use of a product, such as pipe insulation, for example. More particularly, the inven-~ion relates to apparatus for stripping protec~i~e layers from a laminated pressure-sensitive adhesive strip construction and adhering th~ remainder of ~he strip construction to an edye oF a flexible sheet.
BACKGROUND ART
U.S~ Patent 2,717,848 discloses two semicylindrical pieces of pipe insula~ion with pressure-sensitive adhesive on ma~ing surfaces initially separa~ed by wax paper.
U.S. Patent 2,890,739 discloses pipe insulation wherein two strips of adhesive are provided on ~he jacket for good sealing when the adhesive s~rips are joined. The adhesive in this patent is not of the pressure-sensi~ive or self-sealirlg type.
~L;Z;2~32~35 U.S. Patent 4,022,2~8 discloses a jacXet for pipe insulation, with two cooperable strips of pressure-sensitive or self-sealing adhesive each initially protected by a strip of release paper or film.
UOS. Patent 4,157,410 discloses two embodiments of a laminated pressure-sensitive adhesive strip construction prin-cipally for use on pipe insulation.
SUMMARY OF THE INVENTION
The invention therefore consists of apparatus for applying a laminated pressure-sensitive adhesive strip con-struction to flexible sheet material comprising: means for feeding flexible sheet material from a supply roll along a predetermined path, first nozzle means :eor pneumatically strip-ping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means including a nozzle assem~ly having a central slot through which the first release strip passes and having convergent passage-ways for directing compressed air angularly respectively toward opposite sides of an already stripped-away portion of the first release strip and generally in the direction of travel of the first release strip through the central slot to thereby pull additional first release strip from the adhesive strip con-struction on the supply reel as the adhesive strip construction : without the first release strip is being pulled from the supply reel, and means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, ~rom the supply reel to the flexible sheet material and pro-gressively adhering it thereto by the exposed ~irst pressure-~22~3;2~5i -2a sensitive adhesive layer as the flexible sheet material is being fed along the predetermined path.
Another aspect of the invention consists of apparatus for applying a laminated pressure-sensitive adhesive strip construction to flexible sheet material comprising: means for feeding flexible sheet material from a supply roll along a predetermined path, first nozzle means for pneumatically strip-ping a first release strip from a laminated pressure- sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means having a central slot for passage of the first release strip therethrough, means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and adhering it thereto by the exposed first pressure-sensitive adhesive layer, and second nozzle means for pneumati-cally stripping a second release strip from the laminated pressure-sensitive adhesive strip construction on the flexible sheet material to expose a second pressure-sensitive adhesive layer, said second nozzle means having a central slot for pas-sage of the second release strip therethrough. A further aspect of the invention consists of a nozzle assembly for pneumatically stripping a release strip from a laminated pressure-sensitive adhesive strip construction, the nozzle assembly comprising a generally flat elongated rectangular body and a generally flat elongated rectangular cover, the cover having a cen~ral projection extending from an inner surface, the projection being transversely elongated in the direction of a longer dimension of the cover and having a plurality of ~LZ;~8285 -2b-spaced straight parallel grooves respectively on opposite longer outer surfaces thereof, the grooves extending generally in the direction the projection extends from the cover, the cover and the projection having a slot therethrough for receiv-ing the release strip, the body including a generally flat rectangular base portion having a sidewall portion projecting from an inner surface along four side edge portions thereof and having a central rectangular projection spaced inwardly from and projecting from the inner surface less than the sidewall portionr the base portion and the central projection thereon being provided with a central oblong opening defined by an inner surface in cooperative engagement with the central pro-jection on the cover, the inner surface of the cover being engaged with the sidewall portion of the body such that an air passageway is provided around the central projection of the cover adjacent the inner surface thereof and the grooves in said projection form outlets from said passageway, and the sidewall portion of the body having an opening for connecting an air supply tube to said passageway.
BRIEF DESCRIPTION OF DRAWINGS
The invention is more particularly described herein-after with reference to the accompanying drawings in which:
FIG. 1 is a schematic perspective view of apparatus constructed in accordance with the invention for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet such as a jacket for pipe insulation;
FIG. 2 is an exploded perspective view showing two parts of one of the two stripping nozzle assemblies of the apparatus of FIG. 1;
s -2c-FIG. 3 is a longitudinal sectional view through one of the stripping nozzle assemblies;
FIG. 4 is a transverse sectional view through one of the stripping nozzle assemblies;
FIG. 5 is a fragmentary perspective view illustrating the laminated pressure-sensitive adhesive strip construction used with the apparatus of FIG. 1;
FIG. 6 is a perspective view of a length of flexible jacket material and a matching length of pipe insulation material about to be rolled up in the jacket; and 8~i 1 935gA
1 F~G~ 7 is a schen1a'cic end view of a 'length of completed pipe insulation in condition For shipping, with exaggerated thicknesses for -che laminated adhesive s~rip construction.
~E5T MODE OF ~ARRYI~G OUT THE I~VENTION
Wi-th reference to the drawings, FIG. 1 shows a suitably nloun~ed reel 10 of a laminated pressure-sensitive adhesive strip oonstruct;on 11 and a roll 12 of a flexible jacket nlaterial 13 for pipe insulation. The adhesive s~rip 10 construction 11 is best shown in FIG. 5 and includes a first ou~er release s-crip 16 on one side and a second ou~er release strip 1~ on the other side. The release s-trips 16 and 18 may be made of paper or of plastic film such as polyethylene, polypropylene, polyester, polyvinyl, or polyethyleneterephthalate, and are coated on their inner sides with a release coating such as silicone. The release strips 16 and 18 are removed in a pipe insulation factory by the apparatus of this inven~ion and may therefore be referred to ~s "factory" release s~rips. The adhesive strip construction 11 witt10ut the release strip 16 is identified in FIG. 1 by the indicium 11a, and further by ~' the indicium 11b without the release strip 18.
An inner releas~ strip 20, with release coatings on opposite sides, is provided between the outer release strips 16 and 18. A pressure-sensitive adhesive layer 22 is provided between the outer release strip 16 and the inner re'lease strip 20. A carrier scrip 24 is provided between the outer release strip 18 and the inner release strip 20. The carrier strip 24 is pr2ferab1y made of th;n porous paper generally of the type used to make tea bags, and is provided on opposite sides respectively with pressure sensitive adhesive layers 2~ and 2~. The adhesive layers 22 and 26 are of equal, relatively narrow widths, and the adhesive layer 28, the carrier strip 24, and the ~- 35 release strips 16, 18, and 20 are of equal, relatively wide widths. The narrow adhesive layer 26 is adjacen~ the inner : ~' ~ .Z;2~
1~359A
1 release strip 20 and the wi~e adhesive layer 28 is adjacent the outer release strip 18.
The jacket ma~erial 1~ is preferdbly a conventional lanlination of kraft paper and aluminum foil 5 with glass scrim reinforcement th rebetween. As unrolled froln the roll 12 in FIG. 1, the aluminum foil side of the jacket materia'l 13 is facing up, the kraft paper side down.
The jacket material 13 is pulled from the roll 12 and fed horizontally over a support member 30 by any suitable 10 means, such as ~wo pa;rs of rotatably driven pull rolls.
In FIG. 1, one pair of pull rolls 31 and 32 is shown betweerl the roll 12 and the support member 30. Another pair of pull rolls 33 and 34 is shown adjacent a downstream end of the suppor~ member 30, the pull roll 34 being shortened to dvoid the adhesive strip construction llb with its exposed adhesive 28.
In accordance with che invention, two air nozzle assemb'lies 3~ are moun~ed respectively at the ou~er ends ot' the two arms of d generally Y-shaped conduit 38. Each 20 nozzle assembly is connected to an air supply tube 40. As best shown in FIG~. 2-4, each air nozzle assembly 36 includes a generally flat rectangular body 42, a matching cover 44 on one side of the body 42, and a matching connector 46 on the other side of the body 42. An inner surface of' the cover is provided Witil a central projection 44a transversely e'longated in the direciion of the longer di~ension ot the cover. A centra1 slot 44b for receiving one of the release strips 16 and 18 extends tnrough the cover inclusive of the projection. Both the outer surface of the projection 44a and the inner surface thereof defining the slot are convergent in a direction towar~ the connector 46. l'h~ outer surface of ~h~ projection 44a is ; provided respectively a'long opposite portions thereof :; defirling the flat sid~s of the slot 44b wiih a plurality of : 35 spaced, straight, parallel grooves 44c extending toward the body 42.
I93~A ~ S
I lhe body 42 includes a f'1at rectangu'1ar base portion 42a with a perpendicularly projecting sidewall porcion 42b extending around a'll Four sides and a centra'l rectangular projection 42c spaced inwardly from and projecting less than the sidewall portion 42b. The base por~ion ~2a and the projection ~2c are provided with a central oblony opening 42d in which the projection 44a on the cover is received. A surface 42e defining the opening 42d converges toward the connector 46 at the same angle as I0 the outer surface of the projection 44a and forms a seat ; therefor the projection 44a being in engagement with the seat 42e and the cover 44 being in engagement with the ; sidewall porcion 42b. An air passageway 4~ is ~hus provided in surrounding relationship to the portion of the projectian 44a imr~ediately adjacent the inner surface of the cover ~4 and noc in engagement with the seat 42c~ A
threaded aperture 42f is provided in the body 42 for connection of the respective air supply tube 40. The cover ~4 is secured to ~t~e sidewall por~ion ~2b by four relatively short screws 50 disposed midway along the side edges of the body 42 and th~ cover 44. Four rela~ively long screws (not shown) disposed at the corners of the body 42 cover 44 and connector 46 secure a'll three pieces together. As best seen in FIG. 4, the grooves 44c and the seat 42e form conver~ing air passageways from the passageway 48 into the connector 46 which in turn leads into the conduit 38. Air flowing through the grooves 44c exerts a force on the respective release strip 16 or 18 strong enough to keep pu'lling more of the release strip from the remainder of the adhesive strip construction 11 and fèed the freed release strip throu~h the conduit 38 to a place of disposal. In FIG. I the release strip 16 is pneumatically pulled o~f first by the respective nozzle assembly 36 and fed to the conduit 33 after passing over a roll 37 leaving ~he adhesive layer 22 exposed ~nd facing downwardly where the adhesive strip construction lla, without the release strip 16 joins the jacket material 13.
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1935YA ' I228~85 1 In the passing of the jacket materia1 13 and the adhesive strip construction 11a between the pull rolls 31 and 32, the adhesive layer 22 becomes firmly adhered ~o an e~ge portion of the jacke-t material 13. Just before the jacket 5 material 13 passes between the pull rolls 33 and 34, the release strip l8 is pneumatica'lly pulled off by the respective nozzle assembly 36 and fed to the conduit 38 after passing over a guide plate 3g, leaving the adhesive layer ~8 exposed. The guiae plate 39 prevents ~he release 10 strip 1~ From ueing pulled off ~arther upstream and thus maintains the freed strip in proper alignment for entry ,' into the respective nozzle assembly 36. hfter passing the pull rolls 33 and 34, the jacket material 13, inc'lusive of the adhesive strip construction 11b, is chopped to a desired length, which might be, for example, three or four feet, by a chopping blade 52 reciprocable towar~ and away from a back-up bar S4. The cu-t leng~h of jacke~ materia1 pass~s through a pair of pull rolls 55 and 56, the roll 56 being shorter to avoid contac~ with the exposed adhesive layer 28. The pull roll 55 is part of an endless belt conveyor system including a roll 57 and an endless belt 5~.
As the cut length of jacket material 13 passes under a pair of spaced nozzles 593 a pair o~ glue strips 60 is deposiced thereon. As will be understood by those skilled in the art, the nozzl~s 59 are activated and deactivated by sensors respectively sensing the leading and trailing edg~s of the moving cut length of jacket ma-terial 13. The cut length is delivered to a worktable 62.
At the worktable 62, a workman ;s prov;ded w;th a supply of previously formed pieces o~ pipe insulation.
FIG. 6 illustrates such a piece of pipe insulation 6~ and ~ shows how it is placed on a cut 'length of~jacket material ; 13. It is then rolled up in the jacket material 13. FIG.
: 7 shows an end view of a pipe insula~ion product 66 ready for shlpment~ thicknesses at the adhesive ~join~ being exagg2rated. It will be no~ed in FIG. 6 that the adhesive strip construction llb with the layer 28 of adhesive ~22~Z~
1 exposed is disposed along an irlner surface of one longitudinal edge portion of the jacket material 1~, and in FIG. 7 tnat the layer ~g of adhesive becomes attached to an outer surface of the other longitudinal edge portion of the 5 ~acket material 13. Further, the jacket material 13 becomes attached to the insulation 64 at the glue strips 60.
The release strip 20 is a "field" release strip.
When ~he pipe insulation product 66 is to be used, the 1 10 release strip 20 is pulled to separate the adhesive joint and is completely removed before the insulation is placed over d pipe and the adhesive layers 22 and 26 are pressed together to form a strong bond.
Various modifications may be made in the 1 15 structure shown and described without departing ~rom the scope of the invention.
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TEC~INICAL_FIELD
This inven~;on relates generally to a flexible sheet having ~wo strips of pressure-sensi~ive adhesive respectively on different portions thereoF, ~he sheet being manipulated to place the strips of adhesive in contac~ with j each other in the use of a product, such as pipe insulation, for example. More particularly, the inven-~ion relates to apparatus for stripping protec~i~e layers from a laminated pressure-sensitive adhesive strip construction and adhering th~ remainder of ~he strip construction to an edye oF a flexible sheet.
BACKGROUND ART
U.S~ Patent 2,717,848 discloses two semicylindrical pieces of pipe insula~ion with pressure-sensitive adhesive on ma~ing surfaces initially separa~ed by wax paper.
U.S. Patent 2,890,739 discloses pipe insulation wherein two strips of adhesive are provided on ~he jacket for good sealing when the adhesive s~rips are joined. The adhesive in this patent is not of the pressure-sensi~ive or self-sealirlg type.
~L;Z;2~32~35 U.S. Patent 4,022,2~8 discloses a jacXet for pipe insulation, with two cooperable strips of pressure-sensitive or self-sealing adhesive each initially protected by a strip of release paper or film.
UOS. Patent 4,157,410 discloses two embodiments of a laminated pressure-sensitive adhesive strip construction prin-cipally for use on pipe insulation.
SUMMARY OF THE INVENTION
The invention therefore consists of apparatus for applying a laminated pressure-sensitive adhesive strip con-struction to flexible sheet material comprising: means for feeding flexible sheet material from a supply roll along a predetermined path, first nozzle means :eor pneumatically strip-ping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means including a nozzle assem~ly having a central slot through which the first release strip passes and having convergent passage-ways for directing compressed air angularly respectively toward opposite sides of an already stripped-away portion of the first release strip and generally in the direction of travel of the first release strip through the central slot to thereby pull additional first release strip from the adhesive strip con-struction on the supply reel as the adhesive strip construction : without the first release strip is being pulled from the supply reel, and means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, ~rom the supply reel to the flexible sheet material and pro-gressively adhering it thereto by the exposed ~irst pressure-~22~3;2~5i -2a sensitive adhesive layer as the flexible sheet material is being fed along the predetermined path.
Another aspect of the invention consists of apparatus for applying a laminated pressure-sensitive adhesive strip construction to flexible sheet material comprising: means for feeding flexible sheet material from a supply roll along a predetermined path, first nozzle means for pneumatically strip-ping a first release strip from a laminated pressure- sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means having a central slot for passage of the first release strip therethrough, means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and adhering it thereto by the exposed first pressure-sensitive adhesive layer, and second nozzle means for pneumati-cally stripping a second release strip from the laminated pressure-sensitive adhesive strip construction on the flexible sheet material to expose a second pressure-sensitive adhesive layer, said second nozzle means having a central slot for pas-sage of the second release strip therethrough. A further aspect of the invention consists of a nozzle assembly for pneumatically stripping a release strip from a laminated pressure-sensitive adhesive strip construction, the nozzle assembly comprising a generally flat elongated rectangular body and a generally flat elongated rectangular cover, the cover having a cen~ral projection extending from an inner surface, the projection being transversely elongated in the direction of a longer dimension of the cover and having a plurality of ~LZ;~8285 -2b-spaced straight parallel grooves respectively on opposite longer outer surfaces thereof, the grooves extending generally in the direction the projection extends from the cover, the cover and the projection having a slot therethrough for receiv-ing the release strip, the body including a generally flat rectangular base portion having a sidewall portion projecting from an inner surface along four side edge portions thereof and having a central rectangular projection spaced inwardly from and projecting from the inner surface less than the sidewall portionr the base portion and the central projection thereon being provided with a central oblong opening defined by an inner surface in cooperative engagement with the central pro-jection on the cover, the inner surface of the cover being engaged with the sidewall portion of the body such that an air passageway is provided around the central projection of the cover adjacent the inner surface thereof and the grooves in said projection form outlets from said passageway, and the sidewall portion of the body having an opening for connecting an air supply tube to said passageway.
BRIEF DESCRIPTION OF DRAWINGS
The invention is more particularly described herein-after with reference to the accompanying drawings in which:
FIG. 1 is a schematic perspective view of apparatus constructed in accordance with the invention for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet such as a jacket for pipe insulation;
FIG. 2 is an exploded perspective view showing two parts of one of the two stripping nozzle assemblies of the apparatus of FIG. 1;
s -2c-FIG. 3 is a longitudinal sectional view through one of the stripping nozzle assemblies;
FIG. 4 is a transverse sectional view through one of the stripping nozzle assemblies;
FIG. 5 is a fragmentary perspective view illustrating the laminated pressure-sensitive adhesive strip construction used with the apparatus of FIG. 1;
FIG. 6 is a perspective view of a length of flexible jacket material and a matching length of pipe insulation material about to be rolled up in the jacket; and 8~i 1 935gA
1 F~G~ 7 is a schen1a'cic end view of a 'length of completed pipe insulation in condition For shipping, with exaggerated thicknesses for -che laminated adhesive s~rip construction.
~E5T MODE OF ~ARRYI~G OUT THE I~VENTION
Wi-th reference to the drawings, FIG. 1 shows a suitably nloun~ed reel 10 of a laminated pressure-sensitive adhesive strip oonstruct;on 11 and a roll 12 of a flexible jacket nlaterial 13 for pipe insulation. The adhesive s~rip 10 construction 11 is best shown in FIG. 5 and includes a first ou~er release s-crip 16 on one side and a second ou~er release strip 1~ on the other side. The release s-trips 16 and 18 may be made of paper or of plastic film such as polyethylene, polypropylene, polyester, polyvinyl, or polyethyleneterephthalate, and are coated on their inner sides with a release coating such as silicone. The release strips 16 and 18 are removed in a pipe insulation factory by the apparatus of this inven~ion and may therefore be referred to ~s "factory" release s~rips. The adhesive strip construction 11 witt10ut the release strip 16 is identified in FIG. 1 by the indicium 11a, and further by ~' the indicium 11b without the release strip 18.
An inner releas~ strip 20, with release coatings on opposite sides, is provided between the outer release strips 16 and 18. A pressure-sensitive adhesive layer 22 is provided between the outer release strip 16 and the inner re'lease strip 20. A carrier scrip 24 is provided between the outer release strip 18 and the inner release strip 20. The carrier strip 24 is pr2ferab1y made of th;n porous paper generally of the type used to make tea bags, and is provided on opposite sides respectively with pressure sensitive adhesive layers 2~ and 2~. The adhesive layers 22 and 26 are of equal, relatively narrow widths, and the adhesive layer 28, the carrier strip 24, and the ~- 35 release strips 16, 18, and 20 are of equal, relatively wide widths. The narrow adhesive layer 26 is adjacen~ the inner : ~' ~ .Z;2~
1~359A
1 release strip 20 and the wi~e adhesive layer 28 is adjacent the outer release strip 18.
The jacket ma~erial 1~ is preferdbly a conventional lanlination of kraft paper and aluminum foil 5 with glass scrim reinforcement th rebetween. As unrolled froln the roll 12 in FIG. 1, the aluminum foil side of the jacket materia'l 13 is facing up, the kraft paper side down.
The jacket material 13 is pulled from the roll 12 and fed horizontally over a support member 30 by any suitable 10 means, such as ~wo pa;rs of rotatably driven pull rolls.
In FIG. 1, one pair of pull rolls 31 and 32 is shown betweerl the roll 12 and the support member 30. Another pair of pull rolls 33 and 34 is shown adjacent a downstream end of the suppor~ member 30, the pull roll 34 being shortened to dvoid the adhesive strip construction llb with its exposed adhesive 28.
In accordance with che invention, two air nozzle assemb'lies 3~ are moun~ed respectively at the ou~er ends ot' the two arms of d generally Y-shaped conduit 38. Each 20 nozzle assembly is connected to an air supply tube 40. As best shown in FIG~. 2-4, each air nozzle assembly 36 includes a generally flat rectangular body 42, a matching cover 44 on one side of the body 42, and a matching connector 46 on the other side of the body 42. An inner surface of' the cover is provided Witil a central projection 44a transversely e'longated in the direciion of the longer di~ension ot the cover. A centra1 slot 44b for receiving one of the release strips 16 and 18 extends tnrough the cover inclusive of the projection. Both the outer surface of the projection 44a and the inner surface thereof defining the slot are convergent in a direction towar~ the connector 46. l'h~ outer surface of ~h~ projection 44a is ; provided respectively a'long opposite portions thereof :; defirling the flat sid~s of the slot 44b wiih a plurality of : 35 spaced, straight, parallel grooves 44c extending toward the body 42.
I93~A ~ S
I lhe body 42 includes a f'1at rectangu'1ar base portion 42a with a perpendicularly projecting sidewall porcion 42b extending around a'll Four sides and a centra'l rectangular projection 42c spaced inwardly from and projecting less than the sidewall portion 42b. The base por~ion ~2a and the projection ~2c are provided with a central oblony opening 42d in which the projection 44a on the cover is received. A surface 42e defining the opening 42d converges toward the connector 46 at the same angle as I0 the outer surface of the projection 44a and forms a seat ; therefor the projection 44a being in engagement with the seat 42e and the cover 44 being in engagement with the ; sidewall porcion 42b. An air passageway 4~ is ~hus provided in surrounding relationship to the portion of the projectian 44a imr~ediately adjacent the inner surface of the cover ~4 and noc in engagement with the seat 42c~ A
threaded aperture 42f is provided in the body 42 for connection of the respective air supply tube 40. The cover ~4 is secured to ~t~e sidewall por~ion ~2b by four relatively short screws 50 disposed midway along the side edges of the body 42 and th~ cover 44. Four rela~ively long screws (not shown) disposed at the corners of the body 42 cover 44 and connector 46 secure a'll three pieces together. As best seen in FIG. 4, the grooves 44c and the seat 42e form conver~ing air passageways from the passageway 48 into the connector 46 which in turn leads into the conduit 38. Air flowing through the grooves 44c exerts a force on the respective release strip 16 or 18 strong enough to keep pu'lling more of the release strip from the remainder of the adhesive strip construction 11 and fèed the freed release strip throu~h the conduit 38 to a place of disposal. In FIG. I the release strip 16 is pneumatically pulled o~f first by the respective nozzle assembly 36 and fed to the conduit 33 after passing over a roll 37 leaving ~he adhesive layer 22 exposed ~nd facing downwardly where the adhesive strip construction lla, without the release strip 16 joins the jacket material 13.
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1935YA ' I228~85 1 In the passing of the jacket materia1 13 and the adhesive strip construction 11a between the pull rolls 31 and 32, the adhesive layer 22 becomes firmly adhered ~o an e~ge portion of the jacke-t material 13. Just before the jacket 5 material 13 passes between the pull rolls 33 and 34, the release strip l8 is pneumatica'lly pulled off by the respective nozzle assembly 36 and fed to the conduit 38 after passing over a guide plate 3g, leaving the adhesive layer ~8 exposed. The guiae plate 39 prevents ~he release 10 strip 1~ From ueing pulled off ~arther upstream and thus maintains the freed strip in proper alignment for entry ,' into the respective nozzle assembly 36. hfter passing the pull rolls 33 and 34, the jacket material 13, inc'lusive of the adhesive strip construction 11b, is chopped to a desired length, which might be, for example, three or four feet, by a chopping blade 52 reciprocable towar~ and away from a back-up bar S4. The cu-t leng~h of jacke~ materia1 pass~s through a pair of pull rolls 55 and 56, the roll 56 being shorter to avoid contac~ with the exposed adhesive layer 28. The pull roll 55 is part of an endless belt conveyor system including a roll 57 and an endless belt 5~.
As the cut length of jacket material 13 passes under a pair of spaced nozzles 593 a pair o~ glue strips 60 is deposiced thereon. As will be understood by those skilled in the art, the nozzl~s 59 are activated and deactivated by sensors respectively sensing the leading and trailing edg~s of the moving cut length of jacket ma-terial 13. The cut length is delivered to a worktable 62.
At the worktable 62, a workman ;s prov;ded w;th a supply of previously formed pieces o~ pipe insulation.
FIG. 6 illustrates such a piece of pipe insulation 6~ and ~ shows how it is placed on a cut 'length of~jacket material ; 13. It is then rolled up in the jacket material 13. FIG.
: 7 shows an end view of a pipe insula~ion product 66 ready for shlpment~ thicknesses at the adhesive ~join~ being exagg2rated. It will be no~ed in FIG. 6 that the adhesive strip construction llb with the layer 28 of adhesive ~22~Z~
1 exposed is disposed along an irlner surface of one longitudinal edge portion of the jacket material 1~, and in FIG. 7 tnat the layer ~g of adhesive becomes attached to an outer surface of the other longitudinal edge portion of the 5 ~acket material 13. Further, the jacket material 13 becomes attached to the insulation 64 at the glue strips 60.
The release strip 20 is a "field" release strip.
When ~he pipe insulation product 66 is to be used, the 1 10 release strip 20 is pulled to separate the adhesive joint and is completely removed before the insulation is placed over d pipe and the adhesive layers 22 and 26 are pressed together to form a strong bond.
Various modifications may be made in the 1 15 structure shown and described without departing ~rom the scope of the invention.
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Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for applying a laminated pressure-sensitive adhesive strip construction to flexible sheet material comprising:
(a) means for feeding flexible sheet material from a supply roll along a predetermined path, (b) first nozzle means for pneumatically stripping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means including a nozzle assembly having a central slot through which the first re-lease strip passes and having convergent passageways for directing compressed air angularly respectively toward opposite sides of an already stripped-away portion of the first release strip and ge-nerally in the direction of travel of the first release strip through the central slot to thereby pull additional first release strip from the adhesive strip construction on the supply reel as the adhesive strip construction without the first release strip is being pulled from the supply reel, and (c) means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and progres-sively adhering it thereto by the exposed first pressure-sensitive adhesive layer as the flexible sheet material is being fed along the predetermined path.
(a) means for feeding flexible sheet material from a supply roll along a predetermined path, (b) first nozzle means for pneumatically stripping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means including a nozzle assembly having a central slot through which the first re-lease strip passes and having convergent passageways for directing compressed air angularly respectively toward opposite sides of an already stripped-away portion of the first release strip and ge-nerally in the direction of travel of the first release strip through the central slot to thereby pull additional first release strip from the adhesive strip construction on the supply reel as the adhesive strip construction without the first release strip is being pulled from the supply reel, and (c) means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and progres-sively adhering it thereto by the exposed first pressure-sensitive adhesive layer as the flexible sheet material is being fed along the predetermined path.
2. Apparatus as claimed in claim 1 including second nozzle means for pneumatically stripping a second release strip from the laminated pressure-sensitive adhesive strip construction on the flexible sheet material to expose a second pressure-sensitive ad-hesive layer, said second nozzle means including a nozzle assembly having a central slot through which the second release strip pas-ses and having convergent passageways for directing compressed air angularly respectively toward opposite sides of an already stripped-away portion of the second release strip and generally in the direction of travel of the second release strip through the central slot of the second nozzle means to thereby pull addi-tional second release strip from the adhesive strip construction on the flexible sheet material as the flexible sheet material with the adhesive strip construction thereon is being fed along the predetermined path.
3. Apparatus for applying a laminated pressure-sensitive adhesive strip construction to flexible sheet material comprising:
(a) means for feeding flexible sheet material from a supply roll along a predetermined path, (b) first nozzle means for pneumatically stripping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means having a central slot for passage of the first release strip therethrough, (c) means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and adhering it thereto by the exposed first pressure-sensitive adhesive layer, and (d) second nozzle means for pneumatically stripping a second release strip from the laminated pressure-sensitive adhe-sive strip construction on the flexible sheet material to expose a second pressure-sensitive adhesive layer, said second nozzle means having a central slot for passage of the second release strip therethrough.
(a) means for feeding flexible sheet material from a supply roll along a predetermined path, (b) first nozzle means for pneumatically stripping a first release strip from a laminated pressure-sensitive adhesive strip construction on a supply reel to expose a first pressure-sensitive adhesive layer, said first nozzle means having a central slot for passage of the first release strip therethrough, (c) means for feeding the laminated pressure-sensitive adhesive strip construction, without the first release strip, from the supply reel to the flexible sheet material and adhering it thereto by the exposed first pressure-sensitive adhesive layer, and (d) second nozzle means for pneumatically stripping a second release strip from the laminated pressure-sensitive adhe-sive strip construction on the flexible sheet material to expose a second pressure-sensitive adhesive layer, said second nozzle means having a central slot for passage of the second release strip therethrough.
4. A nozzle assembly for pneumatically stripping a release strip from a laminated pressure-sensitive adhesive strip construc-tion, the nozzle assembly comprising a generally flat elongated rectangular body and a generally flat elongated rectangular cover, the cover having a central projection extending from an inner sur-face, the projection being transversely elongated in the direction of a longer dimension of the cover and having a plurality of spa-ced straight parallel grooves respectively on opposite longer outer surfaces thereof, the grooves extending generally in the direction the projection extends from the cover, the cover and the projection having a slot therethrough for receiving the re-lease strip, the body including a generally flat rectangular base portion having a sidewall portion projecting from an inner surface along four side edge portions thereof and having a central rectan-gular projection spaced inwardly from and projecting from the in-ner surface less than the sidewall portion, the base portion and the central projection thereon being provided with a central ob-long opening defined by an inner surface in cooperative engagement with the central projection on the cover, the inner surface of the cover being engaged with the sidewall portion of the body such that an air passageway is provided around the central projec-tion of the cover adjacent the inner surface thereof and the grooves in said projection form outlets from said passageway, and the sidewall portion of the body having an opening for connecting an air supply tube to said passageway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462745A CA1228285A (en) | 1984-09-10 | 1984-09-10 | Method of and apparatus for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462745A CA1228285A (en) | 1984-09-10 | 1984-09-10 | Method of and apparatus for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1228285A true CA1228285A (en) | 1987-10-20 |
Family
ID=4128673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000462745A Expired CA1228285A (en) | 1984-09-10 | 1984-09-10 | Method of and apparatus for applying a laminated pressure-sensitive adhesive strip construction to a flexible sheet |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1228285A (en) |
-
1984
- 1984-09-10 CA CA000462745A patent/CA1228285A/en not_active Expired
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