Patent Application
20180265326
The present invention relates to a reel for winding and unwinding a fibrous web, including a reel core and a coating that forms the outside surface of the reel.
In the paper industry, fibrous webs are wound onto a reel and stored on a reel. The problem arises herein that the web ends move freely especially during reel change-over, and as a result can tear away and possibly cause damage.
DE 100 85 234 T1 describes a method and a device for a reel change. The fibrous web that is to be wound onto a roll is moved by the torque of a reel drum and a gap load. During a reel change, a new reel above the reel drum is brought into contact with the fibrous web.
To avoid a severe impact when closing the gap, the reels are predominantly covered with a rubber layer.
To secure the web ends onto the empty reel, the web ends are covered with an adhesive strip or with a viscous adhesive.
A failure during the transfer process from the full to the empty reel, causes the entire fibrous web or a strip thereof to be discharged into the pulper in the machine basement. To reliably ensure this, the fibrous web on the reel drum is guided to a doctor blade.
What is needed in the art is to improve winding and unwinding of the fibrous web, as well as the quality of the wound roll.
The present invention provides a reel utilized during the winding and unwinding of fibrous web. The invention in one form is directed to an outer lateral surface formed by a plurality of separate coatings arranged axially adjacent to one another, of which at least two adjacent coatings consist of different materials. Thus allowing adaptation of the coating to the requirements of the winding process.
As there are different requirements, particularly in regard to the web edges and the tip of the web, it may be advantageous if the outside surface of the reel is formed by three coatings that are arranged axially adjacent to one another.
The axial length of a coating, or specifically of the center coating should be between 10 and 200 cm, preferably between 30 and 100 cm.
It may be advantageous if the axially centered coating has a smoother surface than the outer coatings, resulting in higher adhesion with the tip of the fibrous web at the start of winding.
Additionally, due to the smoother coating, the generally glued on tip can be removed easily from the reel during unwinding from the reel.
The roughness, Ra, of the center coating can be less than 0.2 μm, whereas on the axially outer coatings, the roughness, Ra, can be 0.6 μm or higher.
In another embodiment, the axially centered coating should consist partially to entirely of polytetrafluoroethylene (‘PTFE’).
In another embodiment a fabric tape is coated with PTFE and forms the coating.
It may be advantageous if the axially centered coating has higher elasticity than the axially outer coatings.
Through greater compressibility in the radial direction, the tip of the fibrous web can press itself into the coating of the reel at the beginning of the winding cycle preventing the tip of the fibrous web from leaving an image in the subsequently wound fibrous web.
The invention in another form is directed to an axially centered coating supported directly on the reel core.
The invention in another form is directed to an axially centered coating which is embedded into a coating extending over the entire axial extension of the reel core.
If the requirements upon the coating are too demanding, it may be advantageous to distribute the requirements between several separate layers that are positioned radially above one another.
In the embodiment of two radial layers of a coating that are positioned on top of one another, the radially outer coating provides a smooth outside surface and the layer positioned radially below it provides the necessary compressibility and elasticity.
The invention in another form is directed to an axially centered coating with an outside diameter of 0.05 to 0.25 mm greater than the outer coatings. The larger diameter in the axial center of the reel provides a reliable and intensive gap formation at the start of winding, and increased pressure at the tip of the fibrous web against the reel.
In another embodiment an axially centered coating is applied onto a coating extending over the entire axial extension of the reel core.
In the interest of low production costs and a relatively high wear and tear resistance, the axially outer coatings should consist of rubber or polyurethane (“PU”).
The application of the center coating can be facilitated if the coating is in the embodiment of a fabric tape.
The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of (an) embodiment(s) of the invention taken in conjunction with the accompanying drawing(s), wherein:
Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification(s) set out herein illustrate(s) (one) embodiment(s) of the invention (, in one form,) and such exemplification(s) (is)(are) not to be construed as limiting the scope of the invention in any manner.
Fibrous web 2 is wound in machines of this type onto a reel 1 in the embodiment of a reel core 3 consisting of steel and in particular, having rubber or plastic coating. During this winding process illustrated in
The two shafts of reel 1 are herein rotatably mounted in one arm respectively of a transfer unit. Prior to reel 1 being fully wound, an empty reel 1 is guided over other arms and brought up to full machine speed by reel drum 8.
To change out the reel, empty reel 1 is placed against reel drum 8 and fibrous web 2, simultaneously removing fully wound reel 1 from reel drum 8.
Fibrous web 2 can herein be severed in different ways. Typically, the separation and the placement of fibrous web 2 on empty reel 1 occurs with the assistance of an air or water jet.
Fully wound reel 1 must be subsequently slowed down and transported into a final position.
Fully wound reel 1 may be subsequently lifted from the machine by a crane.
During changeover of the reel or in the event of a web break of fibrous web 2, it may become necessary to direct fibrous web 2 or a strip thereof into the machine cellar and there after into a pulper for reprocessing.
Doctor blade 9 separates fibrous web 2 or the relevant strip from the outside surface of reel drum 8 and then guides fibrous web 2 downward into the machine cellar.
This arrangement is simple, strong, and functionally reliable.
To improve the winding process, in particular to improve the start of the winding process and unwinding of the leading edge of the fibrous web, the outside surface of reel 1 is formed by two alternating coatings 4, 5 which are arranged circumferentially axially adjacent to one another in circumferential direction. Viewed in axial direction, center coating 5 extends in axial direction between 30 and 100 cm.
At the start of the winding process, a tip of fibrous web 2 is generally located in the center of the web is brought into contact with empty reel 1 and wound up, whereby the web width increases continuously.
To improve adhesion on reel 1, the tip of fibrous web 2 may be provided with an adhesive.
The adhesive presents problems when the tip is separated from the reel during unwinding of fibrous web 2.
To allow for separation of the tip from the reel, an axially centered coating 5 includes a PTFE adhesive tape which is embedded into the axial extending coating 4 which consists of a hard PU and rubber. The continuous coating 4 also forms the two axially lateral coatings 4 of the outside surface.
The PTFE adhesive tape may be wound onto an axially centered recess in continuous coating 4. Due to the comparatively smoother surface of the PTFE adhesive tape than that of lateral coatings 4, the tip of fibrous web 2 adheres very reliably to the surface of reel 1 at the start of winding.
Additionally, the often glued on tip of fibrous web 2 may be separated easily from reel 1 when unwinding.
In another embodiment, an axially centered coating 5 of a PTFE adhesive tape, as illustrated in
In another embodiment, an axially centered coating 5 as illustrated in
The radial inside layer 7 is considerably more elastic than layer 6 and axial continuous coating 4 of reel core 3.
Due to the increased compressibility of center coating 5, the tip of fibrous web 2 can thus press itself more easily into reel 1 such that the tip does not leave an imprint into wound fibrous web 2, thus leading to markings through wound fibrous web 2.
In another embodiment, a center coating 5 as illustrated in
Reel 1 as illustrated in
To prevent imprints in fibrous web 2, the transition from the smaller diameter of lateral coatings 4 to the larger diameter of centered coating 5 should be gradual. Additionally, the diameter of centered coating 5 is 0.1 to 2 mm larger than the diameter of lateral coatings 4.
The thickness of centered coating 5 that is embedded into axially continuous coating 4 is between 0.1 and 5 mm, in particular between 0.1 and 2.5 mm.
The overall thickness of coatings 4, 5 on reel core 3 is 5-20 mm.
While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2015 222 927.0 | Nov 2015 | DE | national |
This is a continuation of PCT application No. PCT/EP2016/077799, entitled “SPOOL”, filed Nov. 16, 2016, which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2016/077799 | Nov 2016 | US |
| Child | 15983728 | US |
