Method and device for producing injection-molded parts by a two-component injection-molding technique and injection-molded part

Abstract

A method for producing injection-molded parts by a two-component injection-molding technique in which a first material component is injected into a mold cavity and is displaced into peripheral regions of the mold cavity by injecting a second material component. The first material component is injected into a partial region of the mold cavity at a first gating point and the second material component is injected into the mold cavity at a second gating point and, as a result, the first material component is acted upon by the second material component and displaced in the direction of the regions of the mold to be filled with the first material component. The first material component is thereby displaced into regions of the mold at the wall, and the second material component is introduced in those regions of the mold as a core material and completely into other regions of the mold.

1 . A method for producing injection-molded parts ( 2 ) by a two-component injection-molding technique, comprising:
 injecting a first material component ( 8 ) into a mold cavity ( 5 ) of a mold ( 3 ) at a first gating point ( 7   a );   injecting a second material component ( 9 ) into the mold cavity at a second gating point ( 7   b ) and displacing the first material into peripheral regions of the mold cavity ( 5 ) with the second material component ( 9 );   wherein, the first material component ( 8 ) is acted upon by the second material component ( 9 ) and is displaced in a direction of regions of the mold to be filled with the first material component ( 8 ), the first material component ( 8 ) being displaced into regions of the mold at the wall; and   wherein the second material component ( 9 ) is introduced at least in certain regions as a core material into the regions of the mold to be filled with the first material and completely into other regions of the mold.   
     
     
         2 . The method as claimed in  claim 1 , further comprising injecting more material of the first material component ( 8 ) than is required for filling the regions of the mold that are to be filled with the first material component ( 8 ). 
     
     
         3 . The method as claimed in  claim 1 , wherein the injecting of the second material component ( 9 ) continues until the second material component ( 9 ) flows into the gating point ( 7   a ) of the first material component ( 8 ). 
     
     
         4 . The method as claimed in  claim 1 , wherein, during the injection of the second material component ( 9 ), a counter-pressure at the first gating point ( 7   a ) is increased. 
     
     
         5 . The method as claimed in  claim 1 , wherein the injecting of the first material component ( 8 ) and of the second material component ( 9 ) takes place simultaneously. 
     
     
         6 . The method as claimed in  claim 1 , wherein the injecting of the first material component ( 8 ) and of the second material component ( 9 ) begins simultaneously. 
     
     
         7 . A device ( 1 ) for producing injection-molded parts ( 2 ) by a two-component injection-molding technique, comprising: a mold ( 3 ) having a mold cavity ( 5 ) for the injection-molded part ( 2 ) to be molded, the mold ( 3 ) has a first gating point ( 7   a ) for a first material component ( 8 ) that is arranged in an area of a region of the mold that is intended to receive the first material component ( 8 ), and a second gating point ( 7   b ) for a second material component ( 9 ), arranged in an area of a region of the mold that is intended to receive the second material component ( 9 ). 
     
     
         8 . The device as claimed in  claim 7 , wherein the mold ( 3 ) is a multi-cavity mold for multiple injection-molded parts ( 2 ). 
     
     
         9 . The device as claimed in  claim 7 , wherein at least one of the gating point ( 7   b ) for the second material component ( 9 ) or the gating point ( 7   a ) for the first material component ( 8 ) has a hot runner system. 
     
     
         10 . The device as claimed in  claim 7 , wherein the region of the mold intended to receive the first material component ( 8 ) in the mold cavity ( 5 ) has a helical or spiral outer contour. 
     
     
         11 . An injection-molded part ( 2 ) produced by a two-component injection-molding technique, comprising at least one use area ( 13 ) having a core region formed of a second material component ( 9 ) and an outer region formed of a first material component ( 8 ), that surrounds the core region, and a handle area ( 12 ) formed of the second material component ( 9 ), adjoining the at least one use area. 
     
     
         12 . The injection-molded part as claimed in  claim 11 , wherein the first material component ( 8 ) is a soft-elastic plastic and the second material component ( 9 ) is a hard plastic material that is harder than the first material component. 
     
     
         13 . The injection-molded part as claimed in  claim 11 , wherein the outer region of the first material component ( 8 ) is formed helically or spirally. 
     
     
         14 . The injection-molded part as claimed in  claim 11 , wherein the injection-molded part ( 2 ) has two gating points for the two material components ( 8 ,  9 ), and the second material is visible at a first gating point for the first material. 
     
     
         15 . The injection-molded part as claimed in  claim 11 , wherein the injection-molded part ( 2 ) has two gating points for the two material components ( 8 ,  9 ), and material of one of the material components ( 8 ,  9 ) is arranged in an area of the gating point for the other material component ( 8 ,  9 ).