Foamed molded product and manufacturing method thereof

Abstract

A foamed molded product having joining flat surfaces to be joined to a joining object, in which the foaming ratio of an ordinary portion is higher than the foaming ratio of joining flat surface forming portions provided with the joining flat surfaces. Preferably, the foamed molded product has the joining flat surface forming portions on an end or both ends of the ordinary portion. Preferably, the foamed molded product has an arch portion whose sectional shape is substantially arcuate and the joining flat surfaces are provided on both ends of a concave side face of the arch portion. Preferably, when the foaming ratio of the joining flat surface forming portion is assumed to be A and the foaming ratio of the ordinary portion is assumed to be B, B/A=1.01-2.5.

1 . A foamed molded product having a joining flat surface to be joined to a joining object, the formed molded product comprising: 
 a joining flat surface forming portion provided with the joining flat surface; and    an ordinary portion which is other portion than the joining flat surface forming portion; and    wherein the foaming ratio of the joining flat surface forming portion provided with the joining flat surface is higher than the foaming ratio of an ordinary portion.    
   
   
       2 . The foamed molded product according to  claim 1 , wherein the joining flat surface forming portions are provided on an end or both ends of the ordinary portion.  
   
   
       3 . The foamed molded product according to  claim 1 , comprising an arch portion as the ordinary portion whose sectional shape is substantially arcuate, and the joining flat surfaces provided on both ends of a concave side face of the arch portion.  
   
   
       4 . The foamed molded product according to  claim 1 , wherein when the foaming ratio of the joining flat surface forming portion is assumed to be A and the foaming ratio of the ordinary portion is assumed to be B, B/A=1.01-2.5.  
   
   
       5 . The foamed molded product according to  claim 1 , further comprising a groove portion which is dented from the same side face as a face provided with the joining flat surface, the groove formed between the joining flat surface forming portion and the ordinary portion.  
   
   
       6 . The foamed molded product according to  claim 1 , wherein the foamed molded product is a side molding to be joined to an automobile body.  
   
   
       7 . A manufacturing method of foamed molded product having a joining flat surface to be joined to a joining object in which the foaming ratio of an ordinary portion is higher than the foaming ratio of a joining flat surface forming portion provided with the joining flat surface, the manufacturing method comprising: 
 using a mold comprising at least a fixed part and a moving part advancing/retracting with respect to the fixed part and containing a cavity for forming the foamed molded product, the moving part being disposed adjacent to a joining surface forming cavity face for forming the joining flat surface in the cavity such that the moving part opposes the ordinary portion;    injecting synthetic resin material containing foaming agent or synthetic resin material containing foaming gas into the cavity; and    retracting the moving part to increase the volume of the ordinary portion in order to urge the foaming.    
   
   
       8 . The manufacturing method of foamed molded product according to  claim 7 , wherein the mold comprises a movable part provided with the moving part capable of advancing/retracting relatively so that the movable part and the fixed part are capable of advancing/retracting relative to each other.  
   
   
       9 . The manufacturing method of foamed molded product according to  claim 7 , wherein the mold comprises an eject part for releasing the foamed molded product after molding and the joining surface forming cavity face is provided at the front end face of the eject part.  
   
   
       10 . The manufacturing method of foamed molded product according to  claim 7 , wherein the foamed molded product has an arch portion whose sectional shape is substantially arcuate, the joining flat surfaces are provided on both ends of a concave side face of the arch portion and the moving part is disposed such that it is sandwiched by two joining surface forming cavity faces.  
   
   
       11 . The manufacturing method of foamed molded product according to  claim 7 , further comprising filling the cavity with preliminary pressurizing gas to provide with preliminary pressure prior to the injecting.  
   
   
       12 . The manufacturing method of foamed molded product according to  claim 7 , wherein the foamed molded product in which groove portions dented from the same face as a face provided with the joining flat surfaces are formed between the joining flat surface forming portion and the ordinary portion, and wherein the mold comprises a projecting portion for forming the groove portion formed on a boundary between the joining surface forming cavity face and the moving part.  
   
   
       13 . The manufacturing method of foamed molded product according to  claim 7 , wherein the moving part is kept at a temperature higher than at least the joining surface forming cavity face.  
   
   
       14 . The manufacturing method of foamed molded product according to  claim 7 , wherein between the moving part and a mold part adjacent thereto, a heat insulating structure for reducing heat transmission between the both is provided and with the moving part kept at a temperature higher than other portions, synthetic resin material containing foaming agent or synthetic resin material containing foaming gas is injected into the cavity and after that, by retracting the moving part, the volume of the ordinary portion is increased in volume to urge the foaming.  
   
   
       15 . A foamed molded product having a joining flat surface to be joined to a joining object, the formed molded product comprising: 
 a joining flat surface forming portion provided with the joining flat surface; and    an ordinary portion which is other portion than the joining flat surface forming portion; and    wherein the foaming ratio of the joining flat surface forming portion provided with the joining flat surface and the foaming ratio of the ordinary portion are substantially equal.    
   
   
       16 . The foamed molded product according to  claim 15 , wherein the joining flat surface forming portions are provided on an end or both ends of the ordinary portion.  
   
   
       17 . The foamed molded product according to  claim 15 , comprising an arch portion as the ordinary portion whose sectional shape is substantially arcuate, and the joining flat surfaces provided on both ends of the concave side face of the arch portion.  
   
   
       18 . The foamed molded product according to  claim 15 , wherein when the foaming ratio of the joining flat surface forming portion is assumed to be A and the foaming ratio of the ordinary portion is assumed to be B, B/A=0.90-1.10.  
   
   
       19 . The foamed molded product according to  claim 15 , wherein the foamed molded product is a side molding to be joined to an automobile body.  
   
   
       20 . A manufacturing method of foamed molded product having a joining flat surface to be joined to a joining object in which the foaming ratio of a joining flat surface forming portion provided with the joining flat surface and the foaming ratio of an ordinary portion are substantially equal, the manufacturing method comprising: 
 using a mold having a fixed part and a moving part advancing/retracting with respect to the fixed part and containing a cavity for forming the foamed molded product, the moving part being disposed such that it is sandwiched by the joining surface forming cavity faces for forming the joining flat surfaces in the cavity, the moving part opposing the ordinary portion, wherein between the moving part and a mold portion adjacent thereto, a heat insulating structure for reducing heat transmission between the both is provided,    keeping the joining surface forming cavity face at a temperature higher than that of the moving part while keeping the moving part at a temperature lower than that of the joining surface forming cavity face;    injecting synthetic resin material containing foaming agent or synthetic resin material containing foaming gas into the cavity,    retracting the moving part to increase the volume of the ordinary portion in order to urge the foaming.    
   
   
       21 . The manufacturing method of foamed molded product according to  claim 20 , wherein the mold comprises a movable part provided with the moving part capable of advancing/retracting relatively so that the movable part and the fixed part are capable of advancing/retracting relative to each other.  
   
   
       22 . The manufacturing method of foamed molded product according to  claim 20 , wherein the mold comprises an eject part for releasing a foamed molded product after molding and the joining surface forming cavity face is provided at the front end face of the eject part.  
   
   
       23 . The manufacturing method of foamed molded product according to  claim 20 , further comprising filling the cavity with preliminary pressurizing gas to provide with preliminary pressure prior to the injecting.