Patent Publication Number: US-7900673-B2

Title: Tissue manufacturing/handling device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application Ser. No. 60/613,841, filed Sep. 28, 2004. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to tissue manufacturing and handling devices and, more particularly, to tissue manufacturing and handling lines where an adhesive spray is utilized to affect reel-to-reel transfer of an advancing tissue web. 
     BRIEF SUMMARY OF THE INVENTION 
     The current state of the art in the tissue making industry embodies a variety of schemes for effecting transfer of an advancing tissue web from a tissue real at or near capacity to a new tissue reel. A number of these schemes involve the spray application of an adhesive to either the advancing web, the new reel, or both, to facilitate turn-up of the advancing web onto a new tissue reel. The present invention introduces improvements in the methodology and hardware of such schemes. 
     A detailed description of the variety of tissue manufacturing/handling devices and the various tissue transfer schemes employed therein is not presented herein because such a description would be beyond the scope of the present invention and may be readily gleaned from a number of sources, including a number of U.S. patents and patent application publications. For example, and not by way of limitation, a number of relevant documents are classified in the subclasses indented under class 242 (WINDING, TENSIONING, OR GUIDING), subclass 520 (CONVOLUTE WINDING OF MATERIAL) in the U.S. Patent and Trademark Office patent classification system. United States Patent Application Publication No. US 2003/0160128, the disclosure of which is incorporated herein by reference, is an example of one patent application publication classified as such. 
     In accordance with one embodiment of the present invention, a tissue manufacturing/handling device is provided. The device comprises a reel turn-up section including a tissue reeling station and an adhesive application system. The tissue reeling station is configured to provide a tissue spool in the path of an advancing tissue web. The adhesive application system is configured to apply a turn-up adhesive to the advancing tissue web or the tissue spool and comprises an adhesive spray rack. The spray rack comprises at least one adhesive applicator nozzle coupled to an adhesive manifold via an adhesive valve assembly. The spray rack comprises a rotation mechanism configured to permit reciprocal rotation of the spray rack about an axis substantially parallel to the spray rack axis between a spray position and at least one maintenance position. 
     In accordance with another embodiment of the present invention, a tissue manufacturing/handling device is provided. The device comprises a reel turn-up section including a tissue reeling station and an adhesive application system. The adhesive application system comprises (i) an adhesive pump configured to pressurize turn-up adhesive within an adhesive manifold, (ii) a pressure transducer configured to provide an indication of a degree of adhesive pressurization in the adhesive manifold or an adhesive conduit in communication with the adhesive manifold, and (iii) a pressure controller in communication with the pressure transducer. The pressure controller is configured to (i) activate the adhesive pump in response to a signal indicating that initiation of the turn-up sequence is approaching, (ii) operate the adhesive pump as a function of a signal received from the pressure transducer, and (iii) deactivate the adhesive pump following completion of the turn-up sequence and prior to initiation of a subsequent turn-up sequence. 
     In accordance with yet another embodiment of the present invention, a tissue manufacturing/handling device is provided wherein the adhesive valve assembly is coupled to the adhesive manifold via a direct mount fitting extending from the manifold to the valve assembly. The direct mount fitting defines a fitting input coupled to the adhesive manifold and a fitting output coupled to the valve assembly. The direct mount fitting comprises an angled fitting defining at least two rotational degrees of freedom of movement, each of the degrees of freedom of movement being defined about non-parallel axes of rotation. 
     Accordingly, it is an object of the present invention to provide improvements in tissue manufacturing and handling lines where an adhesive spray is utilized to affect reel-to-reel transfer of an advancing tissue web. Other objects of the present invention will be apparent in light of the description of the invention embodied herein. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       The following detailed description of specific embodiments of the present invention can be best understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which: 
         FIG. 1  is a schematic illustration of a tissue manufacturing/handling device comprising a reel turn-up section including a tissue reeling station and an adhesive application system according to one embodiment of the present invention 
         FIG. 2  is an illustration of a tissue manufacturing/handling device according to one embodiment of the present invention where a rotatable spray rack is positioned in the spray position; 
         FIG. 3  is a magnified view of a portion of the device illustrated in  FIG. 2 ; 
         FIG. 4  is an illustration of a tissue manufacturing/handling device according to one embodiment of the present invention where the rotatable spray rack is positioned in the junction box maintenance position; and 
         FIG. 5  is an illustration of a tissue manufacturing/handling device according to one embodiment of the present invention where the rotatable spray rack is positioned in the nozzle maintenance position. 
     
    
    
     DETAILED DESCRIPTION 
     Referring initially to  FIG. 1 , a tissue manufacturing/handling device  10  according to one embodiment of the present invention comprises a reel turn-up section  20  including a tissue reeling station  30  and an adhesive application system  40 . The tissue reeling station  30  is configured to provide a tissue spool  32  in the path of an advancing tissue web  50 . The advancing tissue web  50  defines a lengthwise dimension extending along the path of the advancing web  50  and a widthwise dimension substantially perpendicular to the lengthwise dimension and originates from a tissue manufacturing process that can include a variety of in line tissue manufacturing and handling devices, the details of which are beyond the scope of the present invention. 
     The adhesive application system  40  is configured to apply a turn-up adhesive  42  to the advancing tissue web  50  or to a new tissue spool  34 . As can be appreciated from the teachings noted above, the presence of the turn-up adhesive on the web  50  or new spool  34  facilitates turn-up of the web onto the new tissue spool  34 . Referring additionally to  FIGS. 2 and 3 , the adhesive application system  40  comprises an adhesive spray rack  60  oriented along a spray rack axis  62  extending across a widthwise dimension of the advancing tissue web  50 . The spray rack  60  comprises a plurality of adhesive applicator nozzles  64  coupled to an adhesive manifold  44  via an adhesive valve assembly  46 . Typically, a plurality of nozzles  64  will be arranged along the spray rack  60  but it is also noted that a single nozzle that is movable along the width of the advancing web  50  may be utilized. One or more adhesive accumulators  48  are also placed in communication with the adhesive manifold  44  to help stabilize pressure within the adhesive application system  40 . 
     The spray rack  60  comprises a rotation mechanism  65  configured to permit reciprocal rotation of the spray rack  60  about an axis substantially parallel to the spray rack axis  62 . Of course, for the purposes of defining and describing the present invention, it is noted that the axis of rotation and the spray rack axis  62  may be co-axial. In any event, the rotation mechanism  65  is configured to permit reciprocal rotation of the spray rack  60  between the spray position illustrated in  FIGS. 2 and 3  and at least one maintenance position, such as those illustrated in  FIGS. 4 and 5 . It is contemplated that it may be advantageous to ensure that the rotation mechanism  65  is configured to index between the spray position and the nozzle maintenance positions on a selective automated basis. 
     The maintenance position illustrated in  FIG. 4  is referred to herein as the junction box maintenance position because it allows a technician  100  to access and service the electrical junction box  70  and associated electrical connectors  72  serving the adhesive valve assembly  46 . By way of illustration and not limitation, it is noted that optimal access is likely to be achieved if the junction box maintenance position is characterized by rotation of the spray rack  60  through an arc of between about 30 degrees and about 60 degrees from the spray position. 
     Similarly, the maintenance position illustrated in  FIG. 5  is referred to herein as the nozzle maintenance position because it allows the technician  100  to access and service the adhesive applicator nozzles  64 . By way of illustration and not limitation, it is noted that optimal access is likely to be achieved if the nozzle maintenance position is characterized by rotation of the spray rack  60  through an arc of at least about 75 degrees, or more than 90 degrees, from the spray position. 
     The adhesive application system  40  can be configured to permit the spray rack  60  to rotate without interrupting the advancement of the tissue web  50 . In this manner, the technician  100  can initiate rotation of the spray rack from the spray position of  FIGS. 2 and 3  to either or both of the maintenance positions of  FIGS. 4 and 5  without disrupting tissue winding operations. 
     For example, the tissue reeling station  30  may be one where successive tissue spools  32 ,  34  are provided in the path of the advancing tissue web  50  upon initiation of successive turn-up sequences in the tissue manufacturing/handling device  10 . In this case, the rotation mechanism  65  can be configured to permit reciprocal rotation of the spray rack  60  from the spray position to a maintenance position and back in an amount of time that is substantially less than the amount of time between the successive turn-up sequences. Preferably, the duration of the reciprocal rotation time of the spray rack is short enough to allow for spray rack maintenance between the successive turn-up sequences. In this manner, the technician  100  can be assured to have sufficient time to perform maintenance operations and return the spray rack  60  to the spray position prior to initiation of the next turn-up sequence. 
     Referring to  FIG. 1 , the reel turn-up section  20  of the present invention also provides for closed loop pressure control of the adhesive application system  40 . Specifically, the adhesive applicator nozzle  64  is coupled to a supply of turn-up adhesive via the adhesive manifold  44  and the adhesive valve assembly  46 . An adhesive pump  45  is configured to pressurize turn-up adhesive within the adhesive manifold  44  while a pressure transducer  47  provides an adhesive pressure signal. The adhesive pressure signal may correspond to the degree of adhesive pressurization in the adhesive manifold  44  or any other adhesive conduit in communication with the adhesive manifold  44 . A pressure controller  49  is placed in communication with the pressure transducer  47  and a reeling station controller  35  and is configured to facilitate closed loop pressure control of the adhesive application system  40 . 
     Specifically, the pressure controller  49  can be configured to activate the adhesive pump  45  in response to a signal indicating that initiation of the turn-up sequence is approaching. For example, and not by way of limitation, the pressure controller  49  can be configured to activate the adhesive pump  45  about 30 seconds to about 240 seconds prior to initiation of the turn-up sequence. Of course, the most suitable duration in this regard will depend upon a number of factors including, pump capacity, manifold volume, operating pressure, etc., and should be selected to ensure that the adhesive application system  40  has ample time to pressurize before adhesive is released from the system. 
     The pressure controller  49  can also be configured to operate the adhesive pump  45  as a function of a signal received from the pressure transducer  47 . For example, and not by way of limitation, the pressure controller  49  can be configured to deactivate the adhesive pump  45  upon receipt of a maximum pressure signal from the pressure transducer  47 . Additionally, the pressure controller  49  can be configured to operate the adhesive pump to maintain operating pressure within preferred range, e.g., between about 2000 psi and about 3000 psi, or at or above a given value, e.g., about 1500 psi. It is contemplated that operation at or above about 1500 psi can provide significant assurances against adhesive drippage and clogging at the nozzle  64 , particularly where the adhesive is heated to above about 150° F. and the spray duration is limited to below about 500 msec. 
     The pressure controller  49  can also be configured to deactivate the adhesive pump  45  following completion of the turn-up sequence and prior to initiation of a subsequent turn-up sequence. For example, and not by way of limitation, the pressure controller  49  can be configured such that the deactivation of the adhesive pump  45  following completion of the turn-up sequence is conditioned upon receipt of a signal from, for example, the reeling station controller  35  or other suitable hardware, indicating successful completion of the turn-up sequence. The pressure controller  49  can also be configured to deactivate the adhesive pump  45  upon expiration of a given time period following completion or initiation of the turn-up sequence. As is noted above with respect to activation of the adhesive pump, the most suitable duration in this regard will depend upon a number of factors and should be selected to optimize operating efficiency. 
     Referring specifically to  FIG. 3 , the present invention also contemplates an adhesive application system  40  where the adhesive valve assembly  46  is coupled to the adhesive manifold  44  via an angled direct mount fitting  80  extending from the manifold  44  to the valve assembly  46 . The direct mount fitting  80  defines a fitting input  84  coupled to the adhesive manifold  44  and a fitting output  86  coupled to the valve assembly  46 . The direct mount fitting  80  defines at least two rotational degrees of freedom of movement θ 1 , θ 2 , each of which is defined about one of the non-parallel axes of rotation defined by the angled direct mount fitting  80 . In this manner, the adhesive applicator nozzle  64  can be rotated through each the two degrees of rotational freedom of movement, either cooperatively or independently. The rotation may be facilitated in any suitable manner, utilizing any suitable hardware. For example, and not by way of limitation, the rotation may be provided by complementary threaded portions defined on the fitting  80 , the adhesive manifold  44 , and the valve assembly  46 . 
     The two rotational degrees of freedom of movement θ 1 , θ 2  provided by the direct mount fitting  80  can contribute enhanced functionality to the adhesive application system  40  because they allow for fine tuned adjustment of the orientation of the nozzle spray  42  emanating from each adhesive applicator nozzle  64  while performing the simultaneous role of supporting the valve/nozzle assembly. For example, if it is deemed necessary to adjust the orientation of the nozzle spray cross section on the advancing web  50 , the technician  100  can rotate the valve assembly  46  nozzle through θ 2 . Alternatively, or additionally, if it is deemed necessary to adjust the relative position at which the nozzle spray contacts the advancing web  50  along the widthwise dimension of the web  50 , the technician  100  can rotate the fitting  80  through θ 1 . 
     It is contemplated that a variety of fitting configurations will provide this functionality. For example, and not by way of limitation, an angled nozzle that defines a bend angle of at least about 30° may be sufficient for many applications. Direct mount fittings in the form of 45° and 90° elbows are also contemplated. 
     For the purposes of describing and defining the present invention, it is noted that reference herein to tissue manufacturing/handling contemplates a variety of systems utilized for the manufacture or handling of tissue products throughout the tissue industry, including but not limited to, tissue webs of a variety of basis weights and configurations including paper towels, napkins, facial tissues, toilet tissues, commercial tissues, etc. 
     It is noted that terms like “preferably,” “commonly,” and “typically” are not utilized herein to limit the scope of the claimed invention or to imply that certain features are critical, essential, or even important to the structure or function of the claimed invention. Rather, these terms are merely intended to highlight alternative or additional features that may or may not be utilized in a particular embodiment of the present invention. 
     For the purposes of describing and defining the present invention it is noted that the term “substantially” is utilized herein to represent the inherent degree of uncertainty that may be attributed to any quantitative comparison, value, measurement, or other representation. The term “substantially” is also utilized herein to represent the degree by which a quantitative representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue. 
     Having described the invention in detail and by reference to specific embodiments thereof, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims. More specifically, although some aspects of the present invention are identified herein as preferred or particularly advantageous, it is contemplated that the present invention is not necessarily limited to these preferred aspects of the invention.