| 摘要 |
A chemical detector employs a very fine serpentine-like groove which is filled with conductive paint, to form an electric circuit. The application discloses a method of making a molded part having such a groove by making a mold insert for a plastic mold in which the mold insert is formed with grooves defining a land pattern which will form the grooves in the molded part. A mold insert is formed with a main block and a pair of side blocks, the main block having twice as many grooves therein as the side blocks so that, when the side blocks are offset with respect to each other, a serpentine-like land pattern is formed in the three blocks. A method of making the mold insert comprises the forming of a first set of the grooves in the main block and in one of the side blocks, removing the one side block and replacing it with the other side block and forming the second set of grooves in the spaces between the first set of grooves therein, and thereafter repositioning the first and second side blocks so that the grooves therein are offset from the main block by the spacing of one of the grooves, to form the requisite serpentine pattern.
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