Method for forming a plastic article having two colors and a molding device of the method

Abstract

The present invention relates to a method for forming a plastic article having two colors and a molding device of the method. The method for forming a plastic article having two colors uses two male dies whose positions are changed in a reciprocal manner to mate with a female die, so that two plastic materials having two different colors are in turn formed on the two male dies by a plastic injection molding process, thereby forming a plastic article having two colors.

What is claimed is:  
     
         1 . A method for forming a plastic article having two colors, using two male dies whose positions are changed in a reciprocal manner to mate with a female die, so that two plastic materials having two different colors are in turn formed on the two male dies by a plastic injection molding process, thereby forming a plastic article having two colors.  
     
     
         2 . The method in accordance with  claim 1 , wherein the method comprises the steps of: 
 (a) injecting a first plastic material: injecting a first plastic material having a first color injected into a first one of the two male dies, and pressing a female die on the first male die, so as to form the first plastic material on the first male die;    (b) changing the positions of the two male dies: arranging the first male die and a second one of the two male dies in a staggered manner along the vertical direction, and displacing the first male die and the second male die in a parallel and linear manner, so that the positions of the first male die and the second male die are changed;    (c) injecting the first plastic material and a second plastic material into the two male dies respectively: injecting the first plastic material having the first color into the second male die, injecting a second plastic material having a second color into the first male die, and pressing the female die on the first male die and the second male die, so as to form the first plastic material on the second male die and to form the second plastic material on the first male die, so that the first male die forms a plastic article containing the first plastic material and the second plastic material; and    (d) changing the positions of the two male dies again: arranging the first male die and the second male die in a staggered manner along the vertical direction, displacing the first male die and the second male die in a parallel and linear manner, so that the positions of the first male die and the second male die are changed, removing the plastic article from the first male die, injecting the first plastic material having the first color into the first male die, injecting the second plastic material having the second color into the second male die, and pressing the female die on the first male die and the second male die, so as to form the first plastic material on the first male die and to form the second plastic material on the second male die, so that the second male die forms a plastic article containing the first plastic material and the second plastic material  9 .    
     
     
         3 . A molding device for forming a plastic article having two colors, comprising a base set, a male molding board, a mold set, a power set, and a press board, wherein: 
 the male molding board is mounted on the base set, and is formed with a concave;    the mold set includes a shorter male die movably mounted in the concave of the male molding board, a longer male die movably mounted in the concave of the male molding board, and a female die movable relative to the male molding board to press the shorter male die and the longer male die;    the power set is mounted on the male molding board, and includes a first movable assembly to move the shorter male die of the mold set, and a second movable assembly to move the longer male die of the mold set; and    the press board is mounted on the female die of the mold set.    
     
     
         4 . The molding device in accordance with  claim 3 , wherein the base set includes a base plate, two support seats, and two auxiliary plates, wherein: 
 the two support seats of the base set are mounted on two opposite lengthwise longer ends of the base plate to support the male molding board; and    the two auxiliary plates of the base set are mounted on two opposite crosswise shorter ends of the base plate and are located between the two support seats of the base set.    
     
     
         5 . The molding device in accordance with  claim 3 , wherein the male molding board has two opposite ends each formed with an inner channel, the male molding board includes two slide blocks each slidably mounted in the inner channel, and the shorter male die of the mold set has a bottom formed with two locking grooves each secured on a respective one of the two slide blocks of the male molding board, so that the shorter male die of the mold set is moved with the two slide blocks of the male molding board.  
     
     
         6 . The molding device in accordance with  claim 3 , wherein the longer male die of the mold set has a top screwed with a plurality of positioning bolts, and the female die of the mold set is formed with a plurality of positioning holes for mounting a respective one of the plurality of positioning bolts of the longer male die of the mold set.  
     
     
         7 . The molding device in accordance with  claim 3 , wherein the female die of the mold set is formed with two injection holes, and the press board has an inside formed with a first injection nozzle passed through one of the two injection holes of the female die of the mold set for injecting a first plastic material, and a second injection nozzle passed through the other one of the two injection holes of the female die of the mold set for injecting a second plastic material.  
     
     
         8 . The molding device in accordance with  claim 3 , wherein the press board has a bottom provided with a releasing plate.  
     
     
         9 . The molding device in accordance with  claim 3 , wherein the first movable assembly of the power set includes a first movable rod and a first slide seat, and the first slide seat of the first movable assembly of the power set is mounted on a front end of the first movable rod to move therewith, and is secured on the bottom of the shorter male die of the mold set, so that the shorter male die of the mold set is moved by the first slide seat of the first movable assembly of the power set.  
     
     
         10 . The molding device in accordance with  claim 9 , wherein the male molding board has a first side formed with a first slideway, and the first slide seat of the first movable assembly of the power set is slidably mounted in the first slideway of the male molding board.  
     
     
         11 . The molding device in accordance with  claim 3 , wherein the second movable assembly of the power set includes a second movable rod, a second slide seat, a carrying seat, and two push rods, wherein: 
 the second slide seat of the second movable assembly of the power set is mounted on a front end of the second movable rod to move therewith;    the carrying seat of the second movable assembly of the power set is mounted on the second slide seat to move therewith; and    each of the two push rods of the second movable assembly of the power set is mounted on one of two ends of the carrying seat to move with the carrying seat.    
     
     
         12 . The molding device in accordance with  claim 11 , wherein the male molding board has a second side formed with a second slideway, and the second slide seat of the second movable assembly of the power set is slidably mounted in the second slideway of the male molding board.  
     
     
         13 . The molding device in accordance with  claim 11 , wherein the male molding board has two opposite ends each formed with an outer channel, and each of the two push rods of the second movable assembly of the power set is extended through the outer channel of the male molding board.  
     
     
         14 . The molding device in accordance with  claim 11 , wherein the longer male die of the mold set has a bottom having two opposite ends each secured on a respective one of the two push rods of the second movable assembly of the power set, so that the longer male die of the mold set is moved with the two push rods of the second movable assembly of the power set.