Pulp-molded lid and molding device thereof

Abstract

The present invention relates to a pulp-molded lid and its molding device. The molding device comprises a first lid molding die and a second lid molding die. The first lid molding die comprises a snap-fit molding part and a rim molding part, so that a snap-fit section of the pulp-molded lid and a circular rim section at the edge of the pulp-molded lid are formed when the first lid molding die and the second lid molding die are coupled with each other. The rim section and the snap-fit section are used to strengthen the combination of the pulp-molded lid and an external container, so that the combination is more stable.

What is claimed is: 
     
         1 . A pulp-molded lid, which is made of paper pulp and comprises a central section at the center and an annular rim section encircling the central section and having two side walls and further a snap-fit section extended from the outside one of the two side walls, protruding inward;
 wherein the snap-fit section is integrally formed with the pulp-molded lid; and   wherein when an external container is coupled to the pulp-molded lid, the snap-fit section expands and then contracts based on physical elasticity of paper pulp so that the pulp-molded lid can couple to a protrusion extended from a cup rim of the external container.   
     
     
         2 . A molding device of a pulp-molded lid for manufacturing of the pulp-molded lid as claimed in  claim 1 , comprising:
 a first lid molding die, which comprises a first molding unit for shaping of a complete interior profile of the pulp-molded lid wherein the first molding unit has a center molding part for shaping of the central section of the pulp-molded lid and a rim molding part for shaping of the rim section of the pulp-molded lid and the rim molding part has an annular snap-fit molding part situated at an outer edge and at one side far away from the center molding part for shaping of the snap-fit section of the pulp-molded lid; and   a second lid molding die, which comprises a second molding unit for shaping of a complete exterior profile of the pulp-molded lid and is driven to fit into the first lid molding die for shaping of the pulp-molded lid between the second lid molding die and the first lid molding die.   
     
     
         3 . A molding device of a pulp-molded lid as claimed in  claim 2  wherein the first molding unit optionally comprises a plurality of pore channels penetrating the first molding unit inside and each of the pore channels creates suction by which excessive water in pulp slurry during shaping of the pulp-molded lid is drained or pressure in a pulp molding process is regulated. 
     
     
         4 . A molding device of a pulp-molded lid as claimed in  claim 2  wherein the second molding unit optionally comprises a plurality of pore channels penetrating the second molding unit inside and each of the pore channels is used to regulate pressure during shaping of the pulp-molded lid or create suction by which the pulp-molded lid is sucked and separated from the first lid molding die. 
     
     
         5 . A molding device of a pulp-molded lid as claimed in  claim 3  wherein the second molding unit optionally comprises a plurality of pore channels penetrating the second molding unit inside and each of the pore channels is used to regulate pressure during shaping of the pulp-molded lid or create suction by which the pulp-molded lid is sucked and separated from the first lid molding die. 
     
     
         6 . A molding device of a pulp-molded lid as claimed in  claim 2  wherein the first lid molding die is provided with a strainer adhered to the first molding unit and immersed in paper pulp for construction of a first lid pulp-sucking and molding die and the strainer comprises a plurality of fine meshes to filter paper pulp and keep pulp fibers attached and paper pulp deposited on the first lid pulp-sucking and molding die, covered over the first molding unit, and correspondingly applied to the second lid molding die for shaping of the pulp-molded lid by the second molding unit in a second lid pulp-sucking and molding die. 
     
     
         7 . A molding device of a pulp-molded lid as claimed in  claim 3  wherein the first lid molding die is provided with a strainer adhered to the first molding unit and immersed in paper pulp for construction of a first lid pulp-sucking and molding die and the strainer comprises a plurality of fine meshes to filter paper pulp and keep pulp fibers attached and paper pulp deposited on the first lid pulp-sucking and molding die, covered over the first molding unit, and correspondingly applied to the second lid molding die for shaping of the pulp-molded lid by the second molding unit in a second lid pulp-sucking and molding die. 
     
     
         8 . A molding device of a pulp-molded lid as claimed in  claim 2  wherein the second lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a second lid heating and molding die; and
 the first lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a first lid heating and molding die. 
 
     
     
         9 . A molding device of a pulp-molded lid as claimed in  claim 3  wherein the second lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a second lid heating and molding die; and
 the first lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a first lid heating and molding die. 
 
     
     
         10 . A molding device of a pulp-molded lid for manufacturing of the pulp-molded lid as claimed in  claim 1 , comprising:
 a first lid molding die, which comprises a first molding unit for shaping of a complete exterior profile of the pulp-molded lid;   a second lid molding die, which comprises a second molding unit for shaping of a complete interior profile of the pulp-molded lid wherein the second molding unit has a center molding part for shaping of the central section of the pulp-molded lid and a rim molding part for shaping of the rim section of the pulp-molded lid and the rim molding part has an annular snap-fit molding part situated at an outer edge and at one side far away from the center molding part for shaping of the snap-fit section of the pulp-molded lid;   wherein the second lid molding die and the first lid molding die are coupled with each other for shaping of the pulp-molded lid with paper pulp held between the second lid molding die and the first lid molding die.   
     
     
         11 . A molding device of a pulp-molded lid as claimed in  claim 10  wherein the first molding unit optionally comprises a plurality of pore channels penetrating the first molding unit inside and each of the pore channels creates suction by which excessive water in pulp slurry during shaping of the pulp-molded lid is drained or pressure in a pulp molding process is regulated. 
     
     
         12 . A molding device of a pulp-molded lid as claimed in  claim 10  wherein the second molding unit optionally comprises a plurality of pore channels penetrating the second molding unit inside and each of the pore channels is used to regulate pressure during shaping of the pulp-molded lid or create suction by which the pulp-molded lid is sucked and separated from the first lid molding die. 
     
     
         13 . A molding device of a pulp-molded lid as claimed in  claim 11  wherein the second molding unit optionally comprises a plurality of pore channels penetrating the second molding unit inside and each of the pore channels is used to regulate pressure during shaping of the pulp-molded lid or create suction by which the pulp-molded lid is sucked and separated from the first lid molding die. 
     
     
         14 . A molding device of a pulp-molded lid as claimed in  claim 10  wherein the first lid molding die is provided with a strainer adhered to the first molding unit and immersed in paper pulp for construction of a first lid pulp-sucking and molding die and the strainer comprises a plurality of fine meshes to filter paper pulp and keep pulp fibers attached and paper pulp deposited on the first lid pulp-sucking and molding die, covered over the first molding unit, and correspondingly applied to the second lid molding die for shaping the pulp-molded lid by the second molding unit in a second lid pulp-sucking and molding die. 
     
     
         15 . A molding device of a pulp-molded lid as claimed in  claim 11  wherein the first lid molding die is provided with a strainer adhered to the first molding unit and immersed in paper pulp for construction of a first lid pulp-sucking and molding die and the strainer comprises a plurality of fine meshes to filter paper pulp and keep pulp fibers attached and paper pulp deposited on the first lid pulp-sucking and molding die, covered over the first molding unit, and correspondingly applied to the second lid molding die for shaping the pulp-molded lid by the second molding unit in a second lid pulp-sucking and molding die. 
     
     
         16 . A molding device of a pulp-molded lid as claimed in  claim 10  wherein the second lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a second lid heating and molding die; and
 the first lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a first lid heating and molding die. 
 
     
     
         17 . A molding device of a pulp-molded lid as claimed in  claim 11  wherein the second lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a second lid heating and molding die; and
 the first lid molding die which is casted with thermal conductive materials for heating and drying paper pulp and shaping the pulp-molded lid is a first lid heating and molding die.