Processing method of pulp molded container cover

A processing method of a pulp molded container cover (1), wherein the pulp molded container cover (1) comprises:

• a cover top portion (10);
• a lateral inclined wing portion (11), connected to an outer edge of the cover top portion (10);
• an outward downwardly inclined portion (12), connected to a lower side of the lateral inclined wing portion (11);
• an external coupling arc portion (13), connected to an outer edge of the outward downwardly inclined portion (12);
• and a lateral wing portion (14), connected to a lower side of the external coupling arc portion (13) facing away from the outward downwardly inclined portion (12);
• wherein the processing method comprises:
• step S1, wet blank forming, comprising:
• sucking slurry and performing cold extrusion molding by using a cold extrusion die (3) to obtain a wet blank container cover, wherein the lateral wing portion (14) of the wet blank container cover is directly molded with the inward convex portion (15);
• step S2, hot-pressing molding, comprising:
• performing hot-pressing molding on the wet blank container cover to obtain a semi-finished pulp molded container cover by using a hot-pressing die (4);
• and
• step S3, roll-pressing, comprising:
• making an axial line of a roller (5) parallel to an axial line of the semi-finished pulp molded container cover and making the roller (5) be in contact with an outer wall of the lateral wing portion (14), rotating the roller (5) and pressing the outer wall of the lateral wing portion (14) with the roller (5), and making the semi-finished pulp molded container cover rotate about the axial line of the semi-finished pulp molded container cover, thereby obtaining a roll-pressed annular groove (16) formed on the outer wall of the lateral wing portion (14) and reducing an inner diameter of the inward convex portion (15) under roll-pressing of the roller (5) to obtain the pulp molded container cover (1).