Coating machine and coating method thereof

Abstract

A coating machine and its coating method are provided. The coating machine includes: a cardboard conveying mechanism (1) with a front end (11) and a back end (12) higher than the front end (11); and a wax dispenser (2) provided above the back end (12) and provided with a wax dispensing roller (3) on each of two lateral sides of the wax dispenser (2). The coating machine and its coating method are designed to wax not only the surface, but also the edges, of cardboard (10) so that waterproofness of the entire cardboard (10) is ensured. The coating machine is structurally simple and highly automated, and the coating method is easy to perform and highly automated.

What is claimed is: 
     
         1 . A coating machine, characterized by comprising:
 a cardboard conveying mechanism having a front end and a back end, wherein the front end is lower than the back end; and   a wax dispenser provided above the back end and provided with a wax dispensing roller on each of two lateral sides of the wax dispenser.   
     
     
         2 . The coating machine of  claim 1 , characterized in that each of the wax dispensing rollers comprises:
 a roller body having a hollow chamber in communication with the wax dispenser through a connecting tube, the roller body being provided with a plurality of through holes in communication with the hollow chamber, and   a felt sleeve mounted around the roller body.   
     
     
         3 . The coating machine of  claim 1 , characterized in that the cardboard conveying mechanism comprises:
 a conveyor body having a front-end conveying wheel, a back-end conveying wheel, and a conveyor belt looped around the front-end conveying wheel and the back-end conveying wheel such that cardboard is placeable on the conveyor belt in order to be coated; and   a plurality of pressure rollers provided above the conveyor body such that the cardboard is able to be held between the conveyor belt and the pressure rollers.   
     
     
         4 . The coating machine of  claim 1 , characterized by further comprising a wax trough below the wax dispenser and the two wax dispensing rollers. 
     
     
         5 . The coating machine of  claim 1 , characterized in that the front end of the cardboard conveying mechanism is provided with a cardboard holder, and that the cardboard holder has an inclined cardboard-supporting table. 
     
     
         6 . The coating machine of  claim 1 , characterized in that the back end of the cardboard conveying mechanism is provided with a transport mechanism; that the transport mechanism comprises a front-end transport wheel, a middle transport wheel, and a rear-end transport wheel; that the front-end transport wheel and the rear-end transport wheel are lower than the middle transport wheel; and that there are a first transport belt looped around the front-end transport wheel and the middle transport wheel and a second transport belt looped around the middle transport wheel and the rear-end transport wheel. 
     
     
         7 . The coating machine of  claim 6 , characterized in that the rear-end transport wheel is lower than the front-end transport wheel. 
     
     
         8 . The coating machine of  claim 6 , characterized in that a cardboard collector is provided near the rear-end transport wheel. 
     
     
         9 . The coating machine of  claim 4 , characterized by further comprising a wax reservoir for storing liquid wax, wherein the wax reservoir is connected to the wax dispenser through a pump and is below the wax trough. 
     
     
         10 . A coating method of the coating machine of  claim 1 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         11 . A coating method of the coating machine of  claim 2 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         12 . A coating method of the coating machine of  claim 3 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         13 . A coating method of the coating machine of  claim 4 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         14 . A coating method of the coating machine of  claim 5 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         15 . A coating method of the coating machine of  claim 6 , characterized by comprising the steps of:
 a) placing the cardboard on the cardboard conveying mechanism such that the wax dispenser is vertically aligned with a forward edge of the cardboard;   b) turning on the wax dispenser and the cardboard conveying mechanism in order for the wax dispenser to dispense wax to the forward edge and an upper surface of the cardboard; and   c) coating two lateral edges of the cardboard with wax by the wax dispensing rollers on the two lateral sides of the wax dispenser respectively while the cardboard is moved from the front end of the cardboard conveying mechanism to the back end of the cardboard conveying mechanism.   
     
     
         16 . The coating method of  claim 10 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         17 . The coating method of  claim 11 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         18 . The coating method of  claim 12 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         19 . The coating method of  claim 13 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         20 . The coating method of  claim 14 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         21 . The coating method of  claim 15 , characterized in that the cardboard is heat-insulating cardboard, that the heat-insulating cardboard comprises a cardboard body and a heat-insulating material adhesively bonded to each other, and that an outer surface of the cardboard body as well as two lateral edges and a forward edge of the heat-insulating cardboard is to be coated with wax. 
     
     
         22 . The coating method of  claim 16 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         23 . The coating method of  claim 17 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         24 . The coating method of  claim 18 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         25 . The coating method of  claim 19 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         26 . The coating method of  claim 20 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         27 . The coating method of  claim 21 , characterized in that the cardboard body has a thickness of 0.3 mm˜9 mm. 
     
     
         28 . The coating method of  claim 16 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm. 
     
     
         29 . The coating method of  claim 17 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm. 
     
     
         30 . The coating method of  claim 18 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm. 
     
     
         31 . The coating method of  claim 19 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm. 
     
     
         32 . The coating method of  claim 20 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm. 
     
     
         33 . The coating method of  claim 21 , characterized in that the heat-insulating material has a thickness of 1 mm˜6 mm.