(57) Abstract Objective From the shell core which consists of the shell sand for the molding protrudingThe non application part which every width xylem which facilities is done comes and does not apply the coating die medicineIn the aural masking means which it covers, heat resistance and elasticityThe silicon rubber which possesses the character which is superior in Characteristic and flexibility etc structureThe aural masking pad which was formed as the forming material is offered denselyWith. Constitution Sudden facilities it was done from the shell core which consists of the shell sandForm of the non application part which every width xylem amount comes and does not apply the coating die medicineThe mold which coincides to the said prototype with the prototype which coincides as a standard insideThe silico which is formed by the cavity, in the said non application part the Inlaying deviation from makes unrestrictedIt is formed by the n rubber.
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