Patent Document

FIELD OF THE INVENTION 
     The present invention pertains to the technical field of linear adhesive coating technology in LCD production, in particular the present invention relates to a slit nozzle cleaning device for coaters. 
     BACKGROUND OF THE INVENTION 
     Recently, linear photo resist coater (such as slit nozzle coater) is often used in a photolithography process for manufacturing a semiconductor device such as TFT-LCD modules. In photo resist coating process, photo resist is easy to coagulate. After completion of the photo resist coating, a part of the photo resist remains around the nozzle. When the nozzle tip is not clean, it may seriously affect the product yield. Thus, before the photo resist is coated on the glass substrate, the nozzle will be cleaned, for example by a rubber. However, the rubber has a poor water absorption performance; it cannot remove the photo resist around the nozzle. 
     SUMMARY OF THE INVENTION 
     The present invention provides a slit nozzle cleaning device for coaters, which can clean up the photo resist around the opening of the nozzle. 
     The present invention is realized in such a way that: A slit nozzle cleaning device for coaters, the slit nozzle cleaning device for coaters comprising a cleaner, an adhesive removing dissolvent supply unit and a discharge unit, the cleaner is provided with a groove for engaging with the slit nozzle, the side wall of the groove are provided with adhesive removing dissolvent supply through holes, the adhesive removing dissolvent supply unit is in fluid communication with the adhesive removing dissolvent supply through holes so as to supply adhesive removing dissolvent into the groove, the bottom wall of the groove is provided with discharge holes, the discharge unit is in fluid communication with the discharge holes. 
     Preferably, both side walls of the groove are provided with multiple adhesive removing dissolvent supply through holes. 
     Preferably, both side walls of the groove are provided with at least one row of adhesive removing dissolvent supply through holes respectively, the at least one row of adhesive removing dissolvent supply through holes are arranged along the longitudinal direction of the cleaner. 
     Preferably, the discharge holes are not aligned with the photo resist discharge slit of the slit nozzle in vertical direction. 
     Preferably, the bottom wall of the groove is provided with one row of discharge holes. 
     Preferably, the bottom wall of the groove is provided with two rows of discharge holes. 
     Preferably, there is provided with an engagement gap between the groove of the cleaner and the slit nozzle. 
     Preferably, there is provided with one row of adhesive removing dissolvent supply through holes along the longitudinal direction of the cleaner. 
     Preferably, there is provided with two rows of adhesive removing dissolvent supply through holes along the longitudinal direction of the cleaner. 
     Preferably, the length of the cleaner is equal to the length of the slit nozzle. 
     Preferably, the cleaner is a cleaner made of rubber. 
     Preferably, the adhesive removing dissolvent supply unit comprises a pressure tank for receiving adhesive removing dissolvent, the pressure tank is in fluid communication with the adhesive removing dissolvent supply through holes via a pipeline. 
     Preferably, the discharge unit comprises a vacuum pump, the vacuum pump is in fluid communication with the discharge holes via a pipeline. 
     Preferably, the discharge unit comprises a waste tank, the vacuum pump is in fluid communication with the waste tank. 
     According to the present invention, the slit nozzle cleaning device for coaters comprises a cleaner, an adhesive removing dissolvent supply unit and a discharge unit, the cleaner is provided with a groove, the side wall of the groove are provided with adhesive removing dissolvent supply through holes, the bottom wall of the groove is provided with discharge holes, thus the residual photo resist around the nozzle will be dissolved by the adhesive removing dissolvent and discharges via the discharge holes. By this way, the photo resist around the opening of the nozzle can be cleaned up. 
     For more clearly and easily understanding above content of the present invention, the following text will take a preferred embodiment of the present invention with reference to the accompanying drawings for detail description as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. 
         FIG. 1  is a schematic view of the slit nozzle cleaning device for coaters according to an embodiment of the present invention; 
         FIG. 2  is a schematic sectional view showing the engaging state of the cleaner of the slit nozzle cleaning device for coaters in  FIG. 1  and the slit nozzle; 
         FIG. 3  is another schematic perspective view showing the engaging state of the cleaner of the slit nozzle cleaning device for coaters in  FIG. 1  and the slit nozzle; 
         FIG. 4  is a schematic bottom view of cleaner of the slit nozzle cleaning device for coaters in  FIG. 1 ; 
         FIG. 5  is a schematic view of the slit nozzle cleaning device for coaters according to another embodiment of the present invention; 
         FIG. 6  is a schematic perspective view showing the engaging state of the cleaner of the slit nozzle cleaning device for coaters according to yet another embodiment of the present invention and the slit nozzle; and 
         FIG. 7  is a schematic bottom view of cleaner of the slit nozzle cleaning device for coaters according to yet another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     As shown in  FIG. 1  to  FIG. 4 , in the slit nozzle cleaning device for coaters, both side walls of the cleaner are provided with adhesive removing dissolvent supply through holes  202  and adhesive removing dissolvent supply through holes  204 , and the bottom wall of the cleaner is provided with a row of discharge holes  206 . The present invention is not limited to the particular embodiment disclosed. For example, in the embodiment illustrated in  FIG. 7 , the bottom wall of the cleaner is provided with two rows of discharge holes  206 . As shown in  FIG. 2 , there is provided with an engagement gap  600  between the groove  210  of the cleaner  200  and the slit nozzle. By means of the engagement gap  600 , the adhesive removing dissolvent supply through holes  202  and adhesive removing dissolvent supply through holes  204  are in fluid communication with the discharge holes  206  to form a purge route. When the coating process of glass substrate is completed, the slit nozzle is back to home point, and the cleaner is raised to engage with the slit nozzle. At this moment, the cleaner is close to the slit nozzle, and there is a gap (i.e. engagement gap  600 ) between the cleaner  200  and the slit nozzle  100 . The adhesive removing dissolvent supply through holes  204  is in fluid communication with the pressure tank  302  for receiving adhesive removing dissolvent via a high pressure pipe line. Adhesive removing dissolvent are injected in the groove, i.e. the side portion of the slit nozzle  100 . The residual photo resist around the nozzle will be dissolved by the adhesive removing dissolvent and discharges via the discharge holes. Moreover, the vacuum pump  504  is in fluid communication with the discharge holes  206 . By this way, the photo resist around the opening of the nozzle can be cleaned up under the action of the vacuum pump  504 . 
     In addition, the length of the cleaner  200  is equal to the length of the slit nozzle  100 . In another embodiment, the length of the cleaner  200  is equal to the width of the glass substrate. By this configuration, when the slit nozzle is back to home point, and the cleaner is raised to engage with the slit nozzle, the cleaning process can be finished in a short time for example in 1 second. 
     According to the slit nozzle cleaning device for coaters of the present invention, the photo resist around the opening of the nozzle can be cleaned up, the product quality and the product yield can be improved, the cleaning process can be finished in a short time and the tact time of coating process can be shortened. 
     In the embodiment illustrated in  FIG. 7 , the slit nozzle cleaning device for coaters comprises a cleaner  200 , an adhesive removing dissolvent supply unit  300  and a discharge unit  500 . The cleaner  200  is provided with a groove  210  for engaging with the slit nozzle. The opening of the slit nozzle  100  is received in the groove  210 . The side wall of the groove  210  are provided with adhesive removing dissolvent supply through holes  202 . The adhesive removing dissolvent supply unit  300  is in fluid communication with the adhesive removing dissolvent supply through holes  202  so as to supply adhesive removing dissolvent into the groove  210 , the bottom wall of the groove  210  is provided with discharge holes  206 . The discharge unit  500  is in fluid communication with the discharge holes  206 . The above-described adhesive removing dissolvent may be solvent naphtha or orange oil. The above-described adhesive removing dissolvent also may be alcohol. 
     In the embodiment illustrated in  FIG. 1 , both side walls of the groove  210  are provided with multiple adhesive removing dissolvent supply through holes. As shown in  FIG. 2  to  FIG. 4 , one side wall of the groove  210  are provided with multiple adhesive removing dissolvent supply through holes  202 , the other side wall of the groove  210  are provided with multiple adhesive removing dissolvent supply through holes  204 . As shown in  FIG. 6 , one side wall of the groove  210  are provided with two rows of adhesive removing dissolvent supply through holes  204  respectively, the two rows of adhesive removing dissolvent supply through holes  204  are arranged along the longitudinal direction of the cleaner  200 . 
     As shown in  FIG. 2 , the discharge holes  206  are not aligned with the photo resist discharge slit  102  of the slit nozzle  100  in vertical direction. In other words, the discharge holes  206  and the photo resist discharge slit  102  of the slit nozzle  100  are not disposed in a straight line. By this way, more residual photo resist around the nozzle will be dissolved by the adhesive removing dissolvent and discharges via the discharge holes. 
     Preferably, the length of the cleaner  200  is equal to or longer than the length of the slit nozzle  100 , so as to shorten the cleaning time. In the present embodiment, the cleaner  200  is a cleaner made of rubber. 
     As shown in  FIG. 1 , the adhesive removing dissolvent supply unit  300  comprises a pressure tank  302  for receiving adhesive removing dissolvent; the pressure tank  302  is in fluid communication with the adhesive removing dissolvent supply through holes  202  via a pipeline. A valve  304  is provided between the pressure tank  302  and the adhesive removing dissolvent supply through holes  202 . The discharge unit  500  comprises a vacuum pump  504 . The vacuum pump  504  is in fluid communication with the discharge holes  206  via a pipeline. A valve  502  is provided between the vacuum pump  504  and discharge holes  206 . The discharge unit  500  comprises a waste tank  506 , the vacuum pump  504  is in fluid communication with the waste tank  506 . By this way, the photo resist dissolved by the adhesive removing dissolvent can be discharged quickly to the waste tank  506 . The adhesive removing dissolvent supply unit  400  comprises a pressure tank  402  for receiving adhesive removing dissolvent, the pressure tank  402  is in fluid communication with the adhesive removing dissolvent supply through holes  204  via a pipeline. A valve  404  is provided between the pressure tank  402  and the adhesive removing dissolvent supply through holes  204 . Compared with the embodiment illustrated in  FIG. 1 , in the embodiment illustrated in  FIG. 5  the adhesive removing dissolvent supply unit  400  is omitted. The adhesive removing dissolvent supply unit  300  is same with the adhesive removing dissolvent supply unit  400 . 
     According to the present invention, the slit nozzle cleaning device for coaters comprises a cleaner, an adhesive removing dissolvent supply unit and a discharge unit, the cleaner is provided with a groove, the side wall of the groove are provided with adhesive removing dissolvent supply through holes, the bottom wall of the groove is provided with discharge holes, thus the residual photo resist around the nozzle will be dissolved by the adhesive removing dissolvent and discharges via the discharge holes. The photo resist around the opening of the nozzle can be cleaned up, the product quality and the product yield can be improved, the cleaning process can be finished in a short time and the tact time of coating process can be shortened. 
     While the present invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from its scope. Therefore, it is intended that the present invention not be limited to the particular embodiment disclosed, but that the present invention will include all embodiments falling within the scope of the appended claims.

Technology Category: 7