Energy-saving production process method for rapid drying and dewatering of paper-plastic products

Abstract

An energy-saving production process method for rapid drying and dewatering of paper-plastic products, which is applied to production of paper-plastic products, and mainly comprises a cold extrusion press station (2) which is independent and is arranged between a pulp suction forming station (1) and a hot-press shaping station (3); the cold extrusion press station (2) is provided with a top mold and a lower mold (21, 22) which can form a mold closing mold closing gap according to the shape and size of a product, the mold closing mold closing gap is used to first press a primary product to discharge water of about 30% to 50%, and then send same to the hot-press shaping station for continuous dewatering to below 3% to form a paper-plastic product. The paper-plastic product produced by using the present production process can shorten the production time and reduce the consumption of heat energy for drying.

What is claimed is: 
     
         1 . An energy-saving production process method for rapid drying and dewatering of paper-plastic products comprises steps of:
 providing a top mold and a lower mold to cold extrusion press a blank in a cold extrusion press station, wherein the cold extrusion press station is arranged between a pulp suction forming station and a hot-press shaping station, such that a step of vacuum pulp-suction dewatering, a step of cold extrusion dewatering, and a step of hot-press dry dewatering are executed in turns;   wherein in the cold extrusion press station, a mold closing gap is formed after the top mold and the lower mold are connected, and the top mold and the lower mold are configured to press the blank;   wherein in the hot-press shaping station, a mold closing gap between the top mold and the lower mold is equal to a thickness of a finished product, and a thickness of a semi-finished product after being dried in the hot-press shaping station is equal to the thickness of the finished product;   wherein in the cold extrusion press station, a mold closing gap between the top mold and the lower mold is 1 to 1.3 times more than the thickness of the finished product, and a thickness of a semi-dried blank pressed in the cold extrusion press station is 1 to 1.3 times more than the thickness of the finished product; and   wherein in the pulp suction forming station, a mold closing gap between the top mold and the lower mold is 2 to 2.3 times more than the thickness of the finished product, and a thickness of the blank in the pulp suction forming station is 2 to 2.3 times more than the thickness of the finished product.   
     
     
         2 . The energy-saving production process method as claimed in  claim 1 , wherein the lower mold includes a vacuum cavity formed on a bottom thereof, an accommodation chamber defined above the vacuum cavity and configured to accommodate the blank, a molding face formed on the accommodation chamber and corresponding to a shape of the blank, and multiple air orifices defined between and passing through the vacuum cavity and the accommodation chamber so as to vacuum and suck waters of the blank or the semi-dried in the pulp suction forming station, the cold extrusion press station and the hot-press shaping station in a negative pressure. 
     
     
         3 . The energy-saving production process method as claimed in  claim 2 , wherein the lower mold includes an air mesh fixed on a portion of the lower mold which is demolded over 5 degrees, and the other portion of the lower mold demolded less than degrees does not have the air mesh. 
     
     
         4 . The energy-saving production process method as claimed in  claim 3 , wherein a pulp material is feed and sucked in the pulp suction forming station to form the blank, and the blank is delivered into the accommodation chamber of the lower mold in the cold extrusion press station and is extrusion pressed by the top mold and the lower mold, wherein the blank is extrusion pressed by the top mold and is negative-pressure vacuumed to contact with the molding face of the lower mold and the air mesh matingly, such that the blank is further extrusion pressed in the cold extrusion press station to discharge water, then the water of the blank is negative-pressure vacuumed to attach on the vacuum cavity via the multiple air orifices and then to be discharged out of the lower mold, hence the water content of the blank A is reduced to 55% to 60% from 68% to 75%, thus producing the semi-dried blank B with a water content below 3%. 
     
     
         5 . The energy-saving production process method as claimed in  claim 1 , wherein a ratio of drying times in the cold extrusion press station and the hot-press shaping station is 1:2, and a ratio of an energy consumption in the cold extrusion press station and the hot-press shaping station is 2:3.