CA1043559A - Elongate hot melt extrusion nozzle - Google Patents
Elongate hot melt extrusion nozzleInfo
- Publication number
- CA1043559A CA1043559A CA207,004A CA207004A CA1043559A CA 1043559 A CA1043559 A CA 1043559A CA 207004 A CA207004 A CA 207004A CA 1043559 A CA1043559 A CA 1043559A
- Authority
- CA
- Canada
- Prior art keywords
- slit
- lead
- web
- independently mounted
- independently
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
- D21H5/0042—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by pouring or allowing to flow in a continuous stream onto the surface, the entire stream being carried away by the paper
Landscapes
- Coating Apparatus (AREA)
Abstract
ABSTRACT
An apparatus and method for applying hot melt coatings to the under face of a web from the orifice of a coating head. The extrusion pressure preferably lifts the web slightly by overcoming web tension. Uniform heat is achieved by central feed to the head. Smoothing doctor blades are not requir-ed and the head is movable relative to a fixed back-up roll so that roll read-justment is not required when rethreading. One extrusion lip is flexible and independently movable relative to the other to permit change in width of the elongated extrusion orifice. A relatively light, distortable lip bearing member is provided.
An apparatus and method for applying hot melt coatings to the under face of a web from the orifice of a coating head. The extrusion pressure preferably lifts the web slightly by overcoming web tension. Uniform heat is achieved by central feed to the head. Smoothing doctor blades are not requir-ed and the head is movable relative to a fixed back-up roll so that roll read-justment is not required when rethreading. One extrusion lip is flexible and independently movable relative to the other to permit change in width of the elongated extrusion orifice. A relatively light, distortable lip bearing member is provided.
Description
555~
United State Patent 2,4~4~771 of March 15, 1949, to Van Guelpen discloses an angularly tiltable extrusion head over which a web under tension is passed for coating the under face, but no backer roll is used opposite the orifice and a doctor, or smoothing, blade is in rear of the orifice along the web path to actually produce the smooth coating. Such a device is not likely to produce a commercially acceptable, thin~ low cost coating from viscous, tacky, hot melt substances which range from 5,000 to 500,000 cps.
One solution to the problem of commerciaIly successfuIly handling such hot melt coatings at high line speeds and with desired uniformity is found in ~nited State Patent 3,556,832 of January 19, 1971 to Park. Apparatus is disclosed in this patent wherein a web to be coated is passed over a station-ary, somewhat rounded coating head having an elongate slito Paper moves over the elongate slit bearing against the rounded coating head. Hot melt material is extruded through the elongate slit onto the paper. An important part of this process is the transverse stretching of the web as it approaches the coat-ing head and the guiding of the web under tension into sliding contact with the coating head itselfO me coating process described by Park generally in-cludes the steps of simultaneously controlling the rate of flow of the coating material to exert a pressure that is somewhat greater than an opposing force on the tension web, a force normally achieved with a press roll.
In general, the process disclosed by Park has been a successful and desir~ble commercial processO
Indeed the process has been found to be so broadly applicable that there has been a need for improved apparatus that will permit full exploitation of the process capabilitiesO
Therefore, it is an object of the invention to provide an improved e~trusion head apparatus which can be used to achieve improved coating precision of hot melt materials and is readily cleaned and adjusted to meet various pro-cessing conditionsO
It is a further object of the invention to provide apparatus which has ~(.)435~
an improved self-cleaning characteristic during operation.
Another object of the invention is to provide a more efficient coating apparatus, one characterized by a more dependable maintenance of web tension.
Other objects of the invention will be obvious to those skilled in the art on reading the instant application.
The above objects have been substantiaIly achieved by constructing a coating apparatus comprising a coating head, or extrusion die, wherein the web-support members forming an elongate slit comprise elongate lead-on members and lead-off members at least one of which is adjustably mounted for overall positioned adjustment with respect to the other member and also for adjustment of slit width along the length of the slit by means of adjusting either com, pression or tension on individual adjusting means spaced along the member m is adjusting feature, permitting as it does finer control over the slit wldth, also allows central feed to a plenum chamber from which the elon-gate slit feeds hot melt extrudate. In the more advantageous embodiments of the invention, the extrusion die formed of the lead-on and lead-off members and plenum are mounted for skewing with respect to a fixed press roll which is mounted to oppose extrusion pressure by backing the web proximate the slit.
~o In this application and accompanying drawings there is shown and described a preferred embodiment of the invention and suggested various alternatives and modifications thereof, but it is to be understood that these are not intended to be exhaustive and that other changes and modifications can be made within the scope of the invention. These suggestions are selected and included for purposes of illustration in order that other~ skilled in the art will more fully understand the invention and the principles thereof and will be able to modify it in a variety of forms, each as may be best suited in the condition of a particular case.
IN THE DR~WINGS
~, . .
Figure 1 is a partiaIly diagrammatic section in elevation and showing i()4;~5S5~
the relationship of the apparatus of the invention to a web being coated there-with.
Figure 2 is a section of the extrusion apparatus as defined by section line 2:2 on Figure 40 Figure 3 is a section of the apparatus as defined by section line 3:3 on Figure 4.
Figure 4 is a sectional view of the coating apparatus of the inven-tion taken through a planewhich is normal to the direction of the web being coated.
Referring to Figure 1, it is seen that coating apparatus 10 comprises a coating head 12 which is mounted for angular movement by an hydraulic ram 14 by means of a bracket 16 mounted for skewed movement on shaft 18 within arcuate slot 20.
A paper web 22 is passed left-to-right across coating head 12 and receives a layer 24 of a hot melt barrier coating 26.
A fixed press roll 28 is mounted on the opposite side of web 22 and forms means to support said web against pressure exerted by coating mater-ial being forced under pressure onto the web from coating head 12. Idler rolls 30 form means to keep web 22 in snug contact with coating head 12.
Figures 3 and 4 show details of coating head 12~ The coating head is formed of a primary housing which encloses a plenum, or a manifold chamber 32. Coating material is forced into this chamber trhough a conduit 34 and thence through an elongate slit 36 onto the web to be coated. Slit 36 is formed of two elongate members, each of which comprises a web-contacting sur-face, one of which we shall refer to as lead-on surface 38, the other as lead-off surface 40. Lead-on surface 38 forms the web supporting surface of static lead-on member 42. Lead-off surface 40 forms the web-supporting surface of the static lead-off member 440 Lead-on member 42 is fixed by bolt 46 to the housing of plenum chamber 32. However, lead-off member 44 is not so attached~
~J4;~5S9 Lead-off member 44 is mounted for adjustment of its position with respect to member 42 by means of a series of spaced threaded fa~teners 48 which form means to push or pull member 44 as is required to adjust the width of slit 36. Member 44 is sufficiently distortable along its length that fast-eners 48 can be utilized to, for example, m~ke the extreme ends of slit 36 wider than the center thereof, or make whatever other modification in slit width is made desirable along the length thereof.
Fasteners 48 are held in a support plate 50 which in turn is fasten-ed to plenum chamber housing 51 by fasteners 520 A clamp plate ~4 is utilized to hold member 44 snugly against housing 51 with bolts 55.
Figure 2 shows end plates 56 which are fastened by bolts 58 to housing 51 and thereby form the lateral walls of plenum chamber 32.
More detail of the apparatus is shown in Figure 4. Press roll 28 is equipped with ports 60 and a chamber 62 for accommodating heating or cool-ing fluids as may be required for a given coating operation~
Unlike prior art coaters, the press, or backing, roll 28 is rotat-able in fixed bearings 64 and 66 in frame 680 Thus the web path and web ten-sion remain constant and are not affected by any displacement of the roll~
Because the roll cannot be elevated, flying splice operation is facilitated.
The backing roll 28 is not 9ubject to skewing, because skewing is accomplish-ed with the adjustable movable coating head 120 For ~hreading of the web, the coating head may be tilted and compensation may be made for non-parallelism by skewing the coating head in a horizontal plane.
The center feed to the plenum 51 assures uniformity of distribution of coating to both ends of the extrusion slot. It should be noted that there are no gap adjusting screws which cross the extrusion slot to interfere with flow, adjustment of slot opening being accomplished by screws exterior to the slot and outside the coating path~
~hile the device of the above mentioned Van Guelpen patent relies on a doctor, or smoothing, blade for achieving a thin smooth, uniform coating 1()43SS9 of tacky, viscous hot melt substance, the device of this invention achieves a commercially acceptable coating by proper adjustment of the width of the slit, or orifice, 36, together with angular adjustment of the coating head to the web and to the fixed backing, or press roll 28 The extrusion orifice, slit or nozzle 36 of the apparatus of this invention may also be used to extrude cold viscous material which includes a predetermined percentage of solvents, such as dispersions, lacquers (nytro-lacquers) and rubber cements with benzine solvents High viscosity materials of m~ny types may be applied in thinner than conventional layers to thereby save considerable drying time. Capital outlay for drying equipment, such as heat tunnels, ovens and the like, and the floor space for coating apparatus is thus greatly reduced.
It is also to be understood that the foIlowing claims are intended to cover all the generic and specific features of the invention herein des_ cribed and aIl statements of the scope of the invention which might be said to fall therebetween~
United State Patent 2,4~4~771 of March 15, 1949, to Van Guelpen discloses an angularly tiltable extrusion head over which a web under tension is passed for coating the under face, but no backer roll is used opposite the orifice and a doctor, or smoothing, blade is in rear of the orifice along the web path to actually produce the smooth coating. Such a device is not likely to produce a commercially acceptable, thin~ low cost coating from viscous, tacky, hot melt substances which range from 5,000 to 500,000 cps.
One solution to the problem of commerciaIly successfuIly handling such hot melt coatings at high line speeds and with desired uniformity is found in ~nited State Patent 3,556,832 of January 19, 1971 to Park. Apparatus is disclosed in this patent wherein a web to be coated is passed over a station-ary, somewhat rounded coating head having an elongate slito Paper moves over the elongate slit bearing against the rounded coating head. Hot melt material is extruded through the elongate slit onto the paper. An important part of this process is the transverse stretching of the web as it approaches the coat-ing head and the guiding of the web under tension into sliding contact with the coating head itselfO me coating process described by Park generally in-cludes the steps of simultaneously controlling the rate of flow of the coating material to exert a pressure that is somewhat greater than an opposing force on the tension web, a force normally achieved with a press roll.
In general, the process disclosed by Park has been a successful and desir~ble commercial processO
Indeed the process has been found to be so broadly applicable that there has been a need for improved apparatus that will permit full exploitation of the process capabilitiesO
Therefore, it is an object of the invention to provide an improved e~trusion head apparatus which can be used to achieve improved coating precision of hot melt materials and is readily cleaned and adjusted to meet various pro-cessing conditionsO
It is a further object of the invention to provide apparatus which has ~(.)435~
an improved self-cleaning characteristic during operation.
Another object of the invention is to provide a more efficient coating apparatus, one characterized by a more dependable maintenance of web tension.
Other objects of the invention will be obvious to those skilled in the art on reading the instant application.
The above objects have been substantiaIly achieved by constructing a coating apparatus comprising a coating head, or extrusion die, wherein the web-support members forming an elongate slit comprise elongate lead-on members and lead-off members at least one of which is adjustably mounted for overall positioned adjustment with respect to the other member and also for adjustment of slit width along the length of the slit by means of adjusting either com, pression or tension on individual adjusting means spaced along the member m is adjusting feature, permitting as it does finer control over the slit wldth, also allows central feed to a plenum chamber from which the elon-gate slit feeds hot melt extrudate. In the more advantageous embodiments of the invention, the extrusion die formed of the lead-on and lead-off members and plenum are mounted for skewing with respect to a fixed press roll which is mounted to oppose extrusion pressure by backing the web proximate the slit.
~o In this application and accompanying drawings there is shown and described a preferred embodiment of the invention and suggested various alternatives and modifications thereof, but it is to be understood that these are not intended to be exhaustive and that other changes and modifications can be made within the scope of the invention. These suggestions are selected and included for purposes of illustration in order that other~ skilled in the art will more fully understand the invention and the principles thereof and will be able to modify it in a variety of forms, each as may be best suited in the condition of a particular case.
IN THE DR~WINGS
~, . .
Figure 1 is a partiaIly diagrammatic section in elevation and showing i()4;~5S5~
the relationship of the apparatus of the invention to a web being coated there-with.
Figure 2 is a section of the extrusion apparatus as defined by section line 2:2 on Figure 40 Figure 3 is a section of the apparatus as defined by section line 3:3 on Figure 4.
Figure 4 is a sectional view of the coating apparatus of the inven-tion taken through a planewhich is normal to the direction of the web being coated.
Referring to Figure 1, it is seen that coating apparatus 10 comprises a coating head 12 which is mounted for angular movement by an hydraulic ram 14 by means of a bracket 16 mounted for skewed movement on shaft 18 within arcuate slot 20.
A paper web 22 is passed left-to-right across coating head 12 and receives a layer 24 of a hot melt barrier coating 26.
A fixed press roll 28 is mounted on the opposite side of web 22 and forms means to support said web against pressure exerted by coating mater-ial being forced under pressure onto the web from coating head 12. Idler rolls 30 form means to keep web 22 in snug contact with coating head 12.
Figures 3 and 4 show details of coating head 12~ The coating head is formed of a primary housing which encloses a plenum, or a manifold chamber 32. Coating material is forced into this chamber trhough a conduit 34 and thence through an elongate slit 36 onto the web to be coated. Slit 36 is formed of two elongate members, each of which comprises a web-contacting sur-face, one of which we shall refer to as lead-on surface 38, the other as lead-off surface 40. Lead-on surface 38 forms the web supporting surface of static lead-on member 42. Lead-off surface 40 forms the web-supporting surface of the static lead-off member 440 Lead-on member 42 is fixed by bolt 46 to the housing of plenum chamber 32. However, lead-off member 44 is not so attached~
~J4;~5S9 Lead-off member 44 is mounted for adjustment of its position with respect to member 42 by means of a series of spaced threaded fa~teners 48 which form means to push or pull member 44 as is required to adjust the width of slit 36. Member 44 is sufficiently distortable along its length that fast-eners 48 can be utilized to, for example, m~ke the extreme ends of slit 36 wider than the center thereof, or make whatever other modification in slit width is made desirable along the length thereof.
Fasteners 48 are held in a support plate 50 which in turn is fasten-ed to plenum chamber housing 51 by fasteners 520 A clamp plate ~4 is utilized to hold member 44 snugly against housing 51 with bolts 55.
Figure 2 shows end plates 56 which are fastened by bolts 58 to housing 51 and thereby form the lateral walls of plenum chamber 32.
More detail of the apparatus is shown in Figure 4. Press roll 28 is equipped with ports 60 and a chamber 62 for accommodating heating or cool-ing fluids as may be required for a given coating operation~
Unlike prior art coaters, the press, or backing, roll 28 is rotat-able in fixed bearings 64 and 66 in frame 680 Thus the web path and web ten-sion remain constant and are not affected by any displacement of the roll~
Because the roll cannot be elevated, flying splice operation is facilitated.
The backing roll 28 is not 9ubject to skewing, because skewing is accomplish-ed with the adjustable movable coating head 120 For ~hreading of the web, the coating head may be tilted and compensation may be made for non-parallelism by skewing the coating head in a horizontal plane.
The center feed to the plenum 51 assures uniformity of distribution of coating to both ends of the extrusion slot. It should be noted that there are no gap adjusting screws which cross the extrusion slot to interfere with flow, adjustment of slot opening being accomplished by screws exterior to the slot and outside the coating path~
~hile the device of the above mentioned Van Guelpen patent relies on a doctor, or smoothing, blade for achieving a thin smooth, uniform coating 1()43SS9 of tacky, viscous hot melt substance, the device of this invention achieves a commercially acceptable coating by proper adjustment of the width of the slit, or orifice, 36, together with angular adjustment of the coating head to the web and to the fixed backing, or press roll 28 The extrusion orifice, slit or nozzle 36 of the apparatus of this invention may also be used to extrude cold viscous material which includes a predetermined percentage of solvents, such as dispersions, lacquers (nytro-lacquers) and rubber cements with benzine solvents High viscosity materials of m~ny types may be applied in thinner than conventional layers to thereby save considerable drying time. Capital outlay for drying equipment, such as heat tunnels, ovens and the like, and the floor space for coating apparatus is thus greatly reduced.
It is also to be understood that the foIlowing claims are intended to cover all the generic and specific features of the invention herein des_ cribed and aIl statements of the scope of the invention which might be said to fall therebetween~
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In coating apparatus of the type comprising: an elongate slit formed by elongate lead-on member and a lead-off member, said members mounted on a plenum chamber forming means to support and bear against a web member being passed over said slit, and a press roll adapted to provide means to oppose force exerted on said web by extrudate emerging from said slit, the improvement wherein at least one of said lead-on and lead-off members is in-dependently mounted on said apparatus in movable relationship with the other of said members; and a plurality of positioning means are mounted along the length of said independently-mounted member forming means to adjust the width of said slit along the entire length thereof.
2. Apparatus as defined in Claim 1, wherein: said plenum chamber comprises a central port for receiving coating material.
3. Apparatus as defined in Claim 1, wherein: said plenum chamber is mounted on skewing means; and said press roll is mounted in a fixed position, said skewing means providing means to adjust the angular position of said slit opening to said press roll.
4. Apparatus as defined in Claim 2, wherein: said plenum chamber is mounted on skewing means; and said press roll is mounted in a fixed position, said skewing means providing means to adjust the angular position of said slit opening to said press roll.
5. Apparatus as defined in Claim 1, wherein: one said member is static and rigid; said independently mounted member is flexible; and a plur-ality of said adjusting means form displacement means to maintain a differen-tial in slit width along said independently mounted member.
6. Apparatus as defined in Claim 2, wherein: one said member is static and rigid; said independently mounted member is flexible; and a plur-ality of said adjusting means form displacement means to maintain a differen-tial in slit width along said independently mounted member.
7. Apparatus as defined in Claim 3, wherein: one said member is static and rigid; said independently mounted member is flexible; and a plur-ality of said adjusting means form displacement means to maintain a differen-tial in slit width along said independently mounted member.
8. Apparatus as defined in Claim 4, wherein: one said member is static and rigid; said independently mounted member is flexible; and a plur-ality of said adjusting means form displacement means to maintain a differen-tial in slit width along said independently mounted member.
9. Apparatus as defined in Claim 5, wherein: said independently mounted member forms said lead-off edge and comprises a rounded lip at the edge thereof forming a perimeter of said slit.
10. Apparatus as defined in Claim 5, wherein: said adjustment means are so attached to said member that they may each push or pull said member in a direction normal to the length of said slit.
11. Apparatus as defined in Claim 6, wherein: said independently mounted member forms said lead-off edge and comprises a rounded lip at the edge thereof forming a perimeter of said slit.
12. Apparatus as defined in Claim 7, wherein: said independently mounted member forms said lead-off edge and comprises a rounded lip at the edge thereof forming a perimeter of said slit.
13. Apparatus as defined in Claim 6, wherein: said adjustment means are so attached to said member that they may each push or pull said member in a direction normal to the length of said slit.
14. Apparatus as defined in Claim 7, wherein: said adjustment means are so attached to said member that they may each push or pull said member in a direction normal to the length of said slit.
15. Apparatus as defined in Claim 8, wherein: said adjustment means are so attached to said member that they may each push or pull said member in a direction normal to the length of said slit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US414519A US3919974A (en) | 1973-11-09 | 1973-11-09 | Hot melt extrusion apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1043559A true CA1043559A (en) | 1978-12-05 |
Family
ID=23641802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA207,004A Expired CA1043559A (en) | 1973-11-09 | 1974-08-14 | Elongate hot melt extrusion nozzle |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3919974A (en) |
| CA (1) | CA1043559A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE412170B (en) * | 1976-12-21 | 1980-02-25 | Sca Development Ab | PAPER COATING DEVICE |
| US4167914A (en) * | 1977-05-25 | 1979-09-18 | Bolton-Emerson, Inc. | Rotating rod, rotating press roll nip coating apparatus |
| DE2944393C2 (en) * | 1979-11-02 | 1981-12-10 | Bolton-Emerson, Inc., Lawrence, Mass. | Device for applying a thin layer of a coating material to a moving material web |
| AT386762B (en) * | 1985-05-08 | 1988-10-10 | Zimmer Johannes | METHOD AND DEVICE FOR IMPREGNATING AND / OR COATING APPLICATION ON A TRACK OF GOODS |
| US8256374B2 (en) * | 2007-04-11 | 2012-09-04 | Nordson Corporation | Apparatus and methods for profile wrapping laminates |
| WO2019118244A1 (en) * | 2017-12-11 | 2019-06-20 | Delphon Industries, Llc | Carrier for reversibly immobilizing one or more objects |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464771A (en) * | 1946-04-09 | 1949-03-15 | Interstate Folding Box Co | Apparatus for coating webs |
| US2784697A (en) * | 1952-12-16 | 1957-03-12 | Enamelstrip Corp | Apparatus for coating metallic strips |
| US3348526A (en) * | 1964-03-27 | 1967-10-24 | Crown Zellerbach Corp | Coating apparatus for coating webs |
| CH510470A (en) * | 1968-03-04 | 1971-07-31 | Coolidge Park George | Process for applying heated thermoplastic substances to moving, non-textile material webs |
| NL6817090A (en) * | 1968-11-29 | 1970-06-02 | ||
| US3690297A (en) * | 1969-07-22 | 1972-09-12 | Blandin Paper Co | Non-aqueous coating of webs |
-
1973
- 1973-11-09 US US414519A patent/US3919974A/en not_active Expired - Lifetime
-
1974
- 1974-08-14 CA CA207,004A patent/CA1043559A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3919974A (en) | 1975-11-18 |
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