Center/surface rewinder and winder
A winder for winding a web to produce a rolled product is provided. The winder includes a web transport apparatus that is used for conveying the web. Also included in one exemplary embodiment is a plurality of independent winding modules. The winding modules are independently positioned to independently engage the web as the web is conveyed by the web transport apparatus. The winding modules may be configured to wind the web to form a rolled product by center winding, surface winding, and combinations of center and surface winding. The winding modules are structurally and operationally independent of one another where if one module is disabled, another may still operate to produce the rolled product without shutting down the winder.
1. A process for unwinding a parent roll into multiple product rolls comprising:
unwinding a tissue web from a parent roll and conveying the tissue web downstream on a web transport apparatus at a tension, the web transport apparatus having a first side and a second opposite side, wherein a plurality of winding modules are positioned adjacent to the web transport apparatus, each winding module containing a mandrel extending across the web transport apparatus from the first side to the second side, the mandrels being consecutively positioned and fixed along the web transport apparatus and in operative association with a driving device, wherein each of the plurality of winding modules may independently engage and disengage the tissue web moving downstream without having to stop or slow the tissue web as it is conveyed downstream;
positioning a rotating mandrel adjacent to the transport apparatus for forming a nip between the web transport apparatus and the mandrel, the driving device driving the mandrel at a speed and the mandrel being positioned towards the transport apparatus at a nip pressure;
conveying the tissue web into the nip formed between the mandrel and the web transport apparatus so as to initiate winding of the web onto the mandrel; and
controlling at least one of the nip pressure, the incoming tension and the torque of the mandrel in order to control a roll bulk of a roll being wound.
2. A process as defined in claim 1 , wherein the roll bulk is controlled by controlling at least two of the nip pressure, the incoming tension and the torque of the mandrel.
3. A process as defined in claim 2 , wherein the plurality of winding modules includes at least three winding modules that are positioned adjacent to the web transport apparatus and wherein during the process at substantially the same time, a core is located on a first mandrel of a first winding module, a roll of material is formed on a second mandrel of a second winding module and a wound roll is stripped from a third mandrel of a third winding module.
4. A process as defined in claim 3 , wherein rolls are produced on the first mandrel having a first roll bulk and rolls are produced on the second mandrel having a second roll bulk and wherein the first roll bulk is different than the second roll bulk.
5. A process as defined in claim 1 , wherein the roll bulk of a roll being wound is controlled by controlling the nip pressure, the incoming tension and the torque of the mandrel.
6. A process as defined in claim 1 , wherein the process is capable and configured to produce wound rolls having a roll bulk of anywhere between about 3 cc/g to about 13 cc/g solely by controlling at least one of the nip pressure, the incoming tension and the torque of the mandrel.
7. A process as defined in claim 6 , further comprising the step of cutting the tissue web after a rolled product is formed on the mandrel and wherein the tissue web is cut at a web tension of less than about 220 grams of force.
8. A process as defined in claim 1 , wherein the process is capable and configured to produce wound rolls having a roll bulk of anywhere between about 2 cc/g to about 14 cc/g solely by controlling at least one of the nip pressure, the incoming tension and the torque of the mandrel.
9. A process as defined in claim 1 , wherein the roll bulk is increased by decreasing nip pressure, decreasing incoming tension, or decreasing the torque of the mandrel.
10. A process as defined in claim 1 , wherein the roll bulk is decreased by increasing web tension, by increasing nip pressure, or by increasing the torque of the mandrel.
11. A process as defined in claim 1 , further comprising the step of cutting the tissue web as a rolled product is finishing being formed on the mandrel and wherein the tissue web is cut at a web tension of less than about 220 grams of force based on a sheet width of 10.6 cm.
12. A process as defined in claim 11 , further comprising the steps of:
cutting the tissue web after a rolled product is formed on the mandrel;
continuing to unwind the tissue web from the parent roll and conveying a leading edge of the tissue web downstream on the web transport apparatus; and
conveying the tissue web into a nip formed between the web transport apparatus and a second mandrel so as to initiate winding of the web on the second mandrel in a continuous manner such that a speed of the web transport apparatus remains substantially constant.
13. A process as defined in claim 1 , further comprising the step of cutting the tissue web after a rolled product is formed on the mandrel and wherein the tissue web is cut at a web tension of less than about 190 grams of force based on a sheet width of 10.6 cm.
14. A process as defined in claim 1 , wherein the tissue web is conveyed on the web transport apparatus while being wound onto the mandrel at an average speed of from about 1500 feet per minute to about 3000 feet per minute.
15. A process as defined in claim 1 , wherein the roll bulk is controlled solely by varying nip pressure.
16. A process as defined in claim 1 , further comprising the step of accelerating the mandrel to a rotation speed that substantially matches the speed of the web transport apparatus prior to forming the nip between the web transport apparatus and the mandrel.
17. A process as defined in claim 1 , further comprising the step of placing a core onto the mandrel prior to positioning the mandrel adjacent to the transport apparatus, the tissue web being wound upon the core.
18. A process as defined in claim 1 , further comprising the steps of:
loading a core on the mandrel;
accelerating the mandrel to a desired rotation speed;
positioning the winding module to initiate contact between the rotating core and the tissue web; and
stripping the rolled product from the winding module.
19. A process as defined in claim 1 , wherein winding on the mandrel is carried out by using a combination of center winding and surface winding, center winding occurring by driving the mandrel and surface winding occurring by positioning the mandrel towards the web transport apparatus at a controllable magnitude to create the nip pressure.
20. A process as defined in claim 1 , further comprising the steps of:
cutting the tissue web after a rolled product is formed on the mandrel;
continuing to unwind the tissue web from the parent roll and conveying a leading edge of the tissue web downstream on the web transport apparatus; and
conveying the tissue web into a nip formed between the web transport apparatus and a second mandrel so as to initiate winding of the web on the second mandrel in a continuous manner such that a speed of the web transport apparatus remains substantially constant.
21. A process as defined in claim 1 , wherein the transport apparatus comprises a conveyor belt, the conveyor belt comprising a vacuum conveyor belt for holding the tissue web against the surface of the conveyor belt as the web is conveyed downstream.