CA1253894A - Airborne pulp dryer threading clip - Google Patents
Airborne pulp dryer threading clipInfo
- Publication number
- CA1253894A CA1253894A CA000479068A CA479068A CA1253894A CA 1253894 A CA1253894 A CA 1253894A CA 000479068 A CA000479068 A CA 000479068A CA 479068 A CA479068 A CA 479068A CA 1253894 A CA1253894 A CA 1253894A
- Authority
- CA
- Canada
- Prior art keywords
- flaps
- backing member
- web
- portions
- screening
- 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
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
Landscapes
- Paper (AREA)
Abstract
AIR-BORNE PULP DRYER THREADING CLIP
ABSTRACT OF THE DISCLOSURE
The invention provides an apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-born. The apparatus includes a clamp for clamping onto the leading end of the web. The clamp is of the type including a flexible backing member having flexible flaps connected along opposite longitudinal edges thereof. The flaps overlie the backing member and have free edges near the longitudinal center line of the backing member on one side thereof. Springs functionally connect the backing member and the flaps for clamping the web between the flaps and the backing member. The apparatus is characterized by portions of the backing member or flaps comprising air permeable material capable of permitting accelerated evaporation of moisture from the web. Preferably, the portions of the backing or the flaps comprise areas of open-weave fabric such as screens.
ABSTRACT OF THE DISCLOSURE
The invention provides an apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-born. The apparatus includes a clamp for clamping onto the leading end of the web. The clamp is of the type including a flexible backing member having flexible flaps connected along opposite longitudinal edges thereof. The flaps overlie the backing member and have free edges near the longitudinal center line of the backing member on one side thereof. Springs functionally connect the backing member and the flaps for clamping the web between the flaps and the backing member. The apparatus is characterized by portions of the backing member or flaps comprising air permeable material capable of permitting accelerated evaporation of moisture from the web. Preferably, the portions of the backing or the flaps comprise areas of open-weave fabric such as screens.
Description
~ ~2~3~g~
BACKGROUND OF THE iNVENTlON
The invention relates to an apparatus for threading the leading end of an intially wet web through an apparatus having rollers and wherein the web is air-borne.
Apparatuses of the class described are typically employed in feeding the leading end of a web of wood pulp through a pulp dryer. The apparatus is used to advantage on the type of pulp dryer employing rollers and wherein the web is air-borne. This type of dryer is well 10 known wherein the web travels through the dryer while supported by pressurized air which is directed so as to move the pulp along a convoluted path between the rollers.
According to a known method, the leading end of the pulp is threaded 15 through the pulp dryer using three components. The first, usually called a "kite", is a relatively light fabric sewn in the form of one or more sacs adapted to be carried along by the pressurized air and follow the correct convoluted path through the dryer. The kite is attached to a long tape which, in turn, is connected to a clamping 20 device adapted to clamp the leading edge of the web.
One type of known clamping device or clip includes a flexible backing member having flexible flaps connected along opposite longitudinal edges thereof. The flaps overlie the backing member and have free 25 edges near the longitudinal center of the backing member on one side thereof, Springs functionally connect the backing member and the flaps to clamp the web between the flaps and the backing member~
The backing member and flaps conventionally comprise relatively stiff canvas in a double layer to cover the springs.
3û
The web is initially wet but the web behind the clip dries faster than the web within the clip which is covered with canvas. The dry web henind the clip next fo the wet web within the clip causes a stress point between the wet and dry. Thus it has become comrnon practice 4Jp L25;38~
in the industry to punch a number of apertures in the canvas of the clamp to permit air circulation and thus accelerate the drying process at the leading edge of the web and consequently reduce the risk of the leading edge breaking.
This method has not been entirely successful because only relatively small areas of the web are exposed adjacent the apertures punched in the canvas. Furthermore, the edges of the apertures are prone to catching in parts of the drier. Also the web is unsupported at the 1û point of each aperture.
Canadian patent 639,68û and 741,958 are exqmples of methods and apparatuses in the general field of artO
15 SUI~MARY OF THE INVENTION
The invention provides an apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-borne. The apparatus includes clamp means for 20 clamping onlo the leading end of the web. The clarnp means is of the type including a flexible backing member having flexible flaps connected along opposite long;tudinal edges thereof . The f laps overlie the backing member and extend to free edges near the longitudinal center line of the backing member on one side thereof.
25 Resilient means functionally connects the backing member and the flaps for clamping the web between the flaps and the backing member. The apparatus is characterized by portions of the backing or the flaps compr;sing air permeable material capable of permitting accelerated evaporation of moisture from the web.
The portions of the backing member or the flaps may comprise areas of open-weave fabric. Preferably, the fabric is screening.
I N THE DRAW I NGS:
Figure I is a top plan view, partly broken away, of an ~LZ~ii3 !3~3~
.
apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-borne;
Figure 2 is a bottom plqn thereof;
Figure 3 is a tail end view wherein the thickness of fabric is exaggerated, Figure 4 is a sectional view along line 4-4 of Figure I
showing the apparatus partly open.
DES~R I PT I ON OF THE PREFERRED E MBOD I MENTS
Referring to the drawings, apparatus I is qdapted for threading the 15 leading end of an initially wet web through a pulp dryer or other apparatus having rollers and wherein the web is air-borne. The apparatus has a leading end 2 on a triangular-shaped section 4 thereof conventionally made of a double layer of relatively stiff canvas.
The layers of canvas are sewn along the outside edges. The leading 20 end is sewn to a long tape 6 typically made of a coarsely woven fabric such as hemp. The opposite end of the tape is normally sewn to a kite which is initially fed through the dryer. The tape then follows the correct path for the web and carries along apparqtus I which is clamped to the leading edge of the web.
The triangular section 4 is sewn to a backing member 8 along seam 10.
The backing member 8 is connected to a pair of flaps 12 and 14 along longitudinal edges 16 and 18. In fact, as seen in Figure 3, the backing member and flap comprise a single piece of canvas which is 30 folded and doubled together. The doubled canvas is glued together to form the flaps and backing member.
The flaps are resiliently biased against the backing member by a resilient member 20. The resilient member comprises a plurality of 35 adjacent coil springs 22 along one longitudinal edge of the apparatus and a second set of coil springs 24 along the opposite longitudinal edge. The springs on each side are interconnected by transversely extending wires 26 which are located between the two layers of the backing member 8.
Triangular loops of wire 28 extend from the coil springs between the two layers of flap 14, while corresponding 1oOp9 30 extend between the layers of flap 12. The springs, loops and wires 26 of the preferred embodiment are a single continuous loop of wire wound about longitudinal cables 31 to form the coil springs.
As may be observed in Figures 1 and 2, the canvas portions of backing member 8 and the flaps are cut away and replaced by air permeable portions 32 and 34 of flaps 12 and 14 respectively and air permeable portion 36 of the backing member 8. In this embodiment, the air perrneable portions are formed by an open weave fabric or screen sewn to the canvss by continuous close stitching 35. This stitching overlaps the joint between the canvas and the screening, as shown best in the sectional view of Figure 4, to provide a smooth joint which does not catch in the pulp dryer or other such apparatus. Each portion has a double layer of screen, thus portion 32 has a top layer 38 extending over wire loops 30 and coil springs 24. Top layer 38 is folded about coil springs 24 and extends across the bottom of the apparatus to form a bottom 40 layer of backing member 8. The screen is preferably of a synthetic material such as sold under the trade mark Kynar and is heat set at about 1ûO C before sewing it to the canvas. This may be done using boiling water which serves to pre-shrink the material.
In a like manner, top layer 42 of portion 34 is folded about coil springs 22 to form a bottom layer 44 ot the backing member.
Bottom layer 46 of portion 32 is below wire loops 30, while bottom layer 48 of portion 34 is bslow wire loops 28. Layers 46 and 48 form a single piece of material with top layer 50 of backing member 8. Thus it may be seen that top layer 50 extends completely across the clamp means between the longitudinal edges 16 and 18.
By comparing Figures I and 2, it may be seen that the air permeable - ~25;389~
5w portions of the flaps and the backing member overlie each other. As observed from the outside, the air permeable portions comprise a pair of areas on each side of longitudinal center line 52 of the apparatus.
Each area is continuous and extends on the flaps from near their free edges 54 and 56 to the longitudinal edges 16 and 18. On the backing member, the air permeable portions extend from near the longitudinal center line 52 to the longitudinal edges 16 and 18.
The flaps 12 and 1~ have leading ends 58 and 60 and trailing ends 62 and 64. The air permeable portions extend from near the leading edge to near the trailing edge of each flap.
As may be observed in Figure 2, the backing member has a canvas portion 66 extending centrally in a longitudinal direction on the bottom side thereof which is the side opposite the flaps. The flaps have canvas portions 68 and 70 along their free edges 54 and 56. The flaps also have canvas portions 72 and 74 adjacent their leading ends and canvas portions 76 and 78 adjacent trailing ends 52 and 64. The backing member has corresponding canvas portions 80 and 82.
The air perrneable portions of the flaps have tapering areas 84 and 86 adjacent the trailing ends. The backing member has corresponding tapering areas 88 and 90. These expose as much area of the web as possible for improved evaporation of moisture.
As mentioned above, the top air permeable layer 50 of the backing member extends completely across the backing member and over canvas portion 66. The top air permeable layer is separated from canvas portion 66 by transversely extending wires 26. Thus, air circulation is permitted between the center of the web and canvas portion 66 of the backing member.
The clamping apparatus is employed exactly in the same manner as prior art devices of the general type. The construction specified above yields considerably improved drying of the web while, at the same time, retaining the necessary strength and other desirable ~253~
-~ --6-criteria of the prior art devices. Figure 4 illustrates how the apparatus embraces a web 51 of wood pulp for example. Figures 3 and 4 show flaps 12 and 14 partly raised as they would be for initially inserting the web. In normal use, the resilient mernber 20 holds the flaps flat against the web and backing member 8.
BACKGROUND OF THE iNVENTlON
The invention relates to an apparatus for threading the leading end of an intially wet web through an apparatus having rollers and wherein the web is air-borne.
Apparatuses of the class described are typically employed in feeding the leading end of a web of wood pulp through a pulp dryer. The apparatus is used to advantage on the type of pulp dryer employing rollers and wherein the web is air-borne. This type of dryer is well 10 known wherein the web travels through the dryer while supported by pressurized air which is directed so as to move the pulp along a convoluted path between the rollers.
According to a known method, the leading end of the pulp is threaded 15 through the pulp dryer using three components. The first, usually called a "kite", is a relatively light fabric sewn in the form of one or more sacs adapted to be carried along by the pressurized air and follow the correct convoluted path through the dryer. The kite is attached to a long tape which, in turn, is connected to a clamping 20 device adapted to clamp the leading edge of the web.
One type of known clamping device or clip includes a flexible backing member having flexible flaps connected along opposite longitudinal edges thereof. The flaps overlie the backing member and have free 25 edges near the longitudinal center of the backing member on one side thereof, Springs functionally connect the backing member and the flaps to clamp the web between the flaps and the backing member~
The backing member and flaps conventionally comprise relatively stiff canvas in a double layer to cover the springs.
3û
The web is initially wet but the web behind the clip dries faster than the web within the clip which is covered with canvas. The dry web henind the clip next fo the wet web within the clip causes a stress point between the wet and dry. Thus it has become comrnon practice 4Jp L25;38~
in the industry to punch a number of apertures in the canvas of the clamp to permit air circulation and thus accelerate the drying process at the leading edge of the web and consequently reduce the risk of the leading edge breaking.
This method has not been entirely successful because only relatively small areas of the web are exposed adjacent the apertures punched in the canvas. Furthermore, the edges of the apertures are prone to catching in parts of the drier. Also the web is unsupported at the 1û point of each aperture.
Canadian patent 639,68û and 741,958 are exqmples of methods and apparatuses in the general field of artO
15 SUI~MARY OF THE INVENTION
The invention provides an apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-borne. The apparatus includes clamp means for 20 clamping onlo the leading end of the web. The clarnp means is of the type including a flexible backing member having flexible flaps connected along opposite long;tudinal edges thereof . The f laps overlie the backing member and extend to free edges near the longitudinal center line of the backing member on one side thereof.
25 Resilient means functionally connects the backing member and the flaps for clamping the web between the flaps and the backing member. The apparatus is characterized by portions of the backing or the flaps compr;sing air permeable material capable of permitting accelerated evaporation of moisture from the web.
The portions of the backing member or the flaps may comprise areas of open-weave fabric. Preferably, the fabric is screening.
I N THE DRAW I NGS:
Figure I is a top plan view, partly broken away, of an ~LZ~ii3 !3~3~
.
apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-borne;
Figure 2 is a bottom plqn thereof;
Figure 3 is a tail end view wherein the thickness of fabric is exaggerated, Figure 4 is a sectional view along line 4-4 of Figure I
showing the apparatus partly open.
DES~R I PT I ON OF THE PREFERRED E MBOD I MENTS
Referring to the drawings, apparatus I is qdapted for threading the 15 leading end of an initially wet web through a pulp dryer or other apparatus having rollers and wherein the web is air-borne. The apparatus has a leading end 2 on a triangular-shaped section 4 thereof conventionally made of a double layer of relatively stiff canvas.
The layers of canvas are sewn along the outside edges. The leading 20 end is sewn to a long tape 6 typically made of a coarsely woven fabric such as hemp. The opposite end of the tape is normally sewn to a kite which is initially fed through the dryer. The tape then follows the correct path for the web and carries along apparqtus I which is clamped to the leading edge of the web.
The triangular section 4 is sewn to a backing member 8 along seam 10.
The backing member 8 is connected to a pair of flaps 12 and 14 along longitudinal edges 16 and 18. In fact, as seen in Figure 3, the backing member and flap comprise a single piece of canvas which is 30 folded and doubled together. The doubled canvas is glued together to form the flaps and backing member.
The flaps are resiliently biased against the backing member by a resilient member 20. The resilient member comprises a plurality of 35 adjacent coil springs 22 along one longitudinal edge of the apparatus and a second set of coil springs 24 along the opposite longitudinal edge. The springs on each side are interconnected by transversely extending wires 26 which are located between the two layers of the backing member 8.
Triangular loops of wire 28 extend from the coil springs between the two layers of flap 14, while corresponding 1oOp9 30 extend between the layers of flap 12. The springs, loops and wires 26 of the preferred embodiment are a single continuous loop of wire wound about longitudinal cables 31 to form the coil springs.
As may be observed in Figures 1 and 2, the canvas portions of backing member 8 and the flaps are cut away and replaced by air permeable portions 32 and 34 of flaps 12 and 14 respectively and air permeable portion 36 of the backing member 8. In this embodiment, the air perrneable portions are formed by an open weave fabric or screen sewn to the canvss by continuous close stitching 35. This stitching overlaps the joint between the canvas and the screening, as shown best in the sectional view of Figure 4, to provide a smooth joint which does not catch in the pulp dryer or other such apparatus. Each portion has a double layer of screen, thus portion 32 has a top layer 38 extending over wire loops 30 and coil springs 24. Top layer 38 is folded about coil springs 24 and extends across the bottom of the apparatus to form a bottom 40 layer of backing member 8. The screen is preferably of a synthetic material such as sold under the trade mark Kynar and is heat set at about 1ûO C before sewing it to the canvas. This may be done using boiling water which serves to pre-shrink the material.
In a like manner, top layer 42 of portion 34 is folded about coil springs 22 to form a bottom layer 44 ot the backing member.
Bottom layer 46 of portion 32 is below wire loops 30, while bottom layer 48 of portion 34 is bslow wire loops 28. Layers 46 and 48 form a single piece of material with top layer 50 of backing member 8. Thus it may be seen that top layer 50 extends completely across the clamp means between the longitudinal edges 16 and 18.
By comparing Figures I and 2, it may be seen that the air permeable - ~25;389~
5w portions of the flaps and the backing member overlie each other. As observed from the outside, the air permeable portions comprise a pair of areas on each side of longitudinal center line 52 of the apparatus.
Each area is continuous and extends on the flaps from near their free edges 54 and 56 to the longitudinal edges 16 and 18. On the backing member, the air permeable portions extend from near the longitudinal center line 52 to the longitudinal edges 16 and 18.
The flaps 12 and 1~ have leading ends 58 and 60 and trailing ends 62 and 64. The air permeable portions extend from near the leading edge to near the trailing edge of each flap.
As may be observed in Figure 2, the backing member has a canvas portion 66 extending centrally in a longitudinal direction on the bottom side thereof which is the side opposite the flaps. The flaps have canvas portions 68 and 70 along their free edges 54 and 56. The flaps also have canvas portions 72 and 74 adjacent their leading ends and canvas portions 76 and 78 adjacent trailing ends 52 and 64. The backing member has corresponding canvas portions 80 and 82.
The air perrneable portions of the flaps have tapering areas 84 and 86 adjacent the trailing ends. The backing member has corresponding tapering areas 88 and 90. These expose as much area of the web as possible for improved evaporation of moisture.
As mentioned above, the top air permeable layer 50 of the backing member extends completely across the backing member and over canvas portion 66. The top air permeable layer is separated from canvas portion 66 by transversely extending wires 26. Thus, air circulation is permitted between the center of the web and canvas portion 66 of the backing member.
The clamping apparatus is employed exactly in the same manner as prior art devices of the general type. The construction specified above yields considerably improved drying of the web while, at the same time, retaining the necessary strength and other desirable ~253~
-~ --6-criteria of the prior art devices. Figure 4 illustrates how the apparatus embraces a web 51 of wood pulp for example. Figures 3 and 4 show flaps 12 and 14 partly raised as they would be for initially inserting the web. In normal use, the resilient mernber 20 holds the flaps flat against the web and backing member 8.
Claims (12)
1. An apparatus for threading the leading end of an initially wet web through an apparatus having rollers and wherein the web is air-borne, the apparatus including clamp means for clamping onto the leading end of the web, the clamp means being of the type including a flexible backing member having flexible flaps connected along opposite longitudinal edges thereof, the flaps overlying the backing member and extending to free edges near the longitudinal center line of the backing member on one side thereof, and resilient means functionally connecting the backing member and the flaps for clamping the web between the flaps and the backing member, the apparatus being characterized by:
portions of the backing member or the flaps comprising air permeable material capable of permitting accelerated evaporation of moisture from the web.
portions of the backing member or the flaps comprising air permeable material capable of permitting accelerated evaporation of moisture from the web.
2. An apparatus as claimed in Claim 1, wherein the portions of the backing member or the flaps comprise areas of open-weave fabric.
3. An apparatus as claimed in Claim 2, wherein the portions comprise screening.
4. An apparatus as claimed in Claim 3, wherein the portions comprise screening.
5. An apparatus as claimed in Claim 1, wherein the portions are overlying parts of the flaps and the backing member.
6. An apparatus as claimed in Claim 1, wherein the portions comprise a pair of areas on each side of the longitudinal center line, each area being continuous and extending from near the longitudinal center line of the backing member and over a longitudinal edge of the clamp means to a point near the free edges of the flaps.
7. An apparatus as claimed in Claim 6, wherein the flaps have a leading end and a trailing end, the areas extending from near the leading end to near the trailing end of each flap.
8. An apparatus as claimed in Claim 7, wherein the portions comprise overlying areas of the flaps and the backing member.
9. An apparatus as claimed in Claim 1, wherein the resilient means comprises a plurality of coil springs extending along the longitudinal edges of the clamp means, wires extending transversely across the backing member interconnecting the springs, and loops of wire extending into the flaps from the springs, the portions of the backing member and the flap being double layers of screening, the springs, the wire and the loops being between the layers of screening.
10. An apparatus as claimed in Claim 9, wherein the backing member has a layer of screening adjacent the flaps which extends across the backing member between the longitudinal edges.
11. An apparatus as claimed in Claim 10, wherein the backing member and flaps have portions of canvas material adjacent leading and trailing ends thereof, extending centrally along the backing on a side thereof opposite the flaps, and along the free edges of the flaps.
12. An apparatus as claimed in Claim 10, wherein the canvas portions and adjacent screening are connected together by continuous close stitching overlapping the joint between the canvas portions and the screening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000479068A CA1253894A (en) | 1985-04-12 | 1985-04-12 | Airborne pulp dryer threading clip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000479068A CA1253894A (en) | 1985-04-12 | 1985-04-12 | Airborne pulp dryer threading clip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1253894A true CA1253894A (en) | 1989-05-09 |
Family
ID=4130261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000479068A Expired CA1253894A (en) | 1985-04-12 | 1985-04-12 | Airborne pulp dryer threading clip |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1253894A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6729386B1 (en) | 2001-01-22 | 2004-05-04 | Stanley H. Sather | Pulp drier coil with improved header |
-
1985
- 1985-04-12 CA CA000479068A patent/CA1253894A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6729386B1 (en) | 2001-01-22 | 2004-05-04 | Stanley H. Sather | Pulp drier coil with improved header |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100607722B1 (en) | Method of manufacturing a press fabric | |
| US4698250A (en) | Method for the manufacture of a press felt and press felt | |
| US4902383A (en) | Method of making a papermaker's felt with no flap seam | |
| DK155840C (en) | GREENHOUSE CURTAIN | |
| US3283388A (en) | Method and means for making a papermaker's felt endless | |
| KR20000075783A (en) | Multi axial pin seamed papermakers press felt | |
| US4311172A (en) | Multi-layer spliced drainage sieve belt and method for splicing same | |
| CA1253894A (en) | Airborne pulp dryer threading clip | |
| US5628098A (en) | Method and device for the winding of warp strips | |
| ES2017084B3 (en) | MACHINE BRAIDING, ESPECIALLY FOR MACHINES FOR FELT PAPER OR SIEVE. | |
| WO2005070192A1 (en) | Cover for modules of fibrous material | |
| BRPI0612359A2 (en) | process for forming a multilayer composition and multilayer composition | |
| JPH02258881A (en) | Heat-bonding tape and its manufacture | |
| DE1461113A1 (en) | Dryer belts | |
| US6001443A (en) | Dryer fabric seaming | |
| JP2667903B2 (en) | Endless wire in pulp thickener | |
| ES2075846T3 (en) | PROCEDURE AND DEVICE FOR THE MANUFACTURE OF STRETCHED NARROW TAPES, COMPOSED OF SEVERAL LAYERS. | |
| SE8303075D0 (en) | PROCEDURE AND DEVICE FOR REDUCING THE ENERGY ACCESS WHEN DRYING A PAPER COAT | |
| JPH07327782A (en) | Hanging cloth | |
| CA1259344A (en) | Airborne pulp dryer kites | |
| JPH0346000Y2 (en) | ||
| US4913947A (en) | Seam for papermaker's felt | |
| JPS63503554A (en) | Method and configuration for splicing each end of a band-shaped product | |
| US7641768B2 (en) | Method and joining assembly for joining ends of a fabric in a paper machine | |
| JPH0129277Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |