Jewelry molding silicone rubber trouble shooting

 

보석 형뜨기 실리콘고무의 사용시 문제점 발생원인과 그 대책을 아래와 같이 알아 본다.

 

Guide to solving common mold making problems.
Finished mold is tacky and soft. Cause: Insufficient vulcanization time and/or temperature. Solution: Check vulcanizer with accurate thermometer and observe recommended time and temperature. Finished mold hard and springy - won’t lie flat. Cause: Excessive pressure. Excessive vulcanization time and/or temperature. Solution: Reduce pressure. Check temperature with accurate thermometer. Observe recommended time and temperature. Mold curls, won’t lie flat. Cause: Mold began vulcanizing before pressure was applied. Solution: Close press and tighten as soon as mold frame is placed inside. Partial de-lamination of mold into separate layers. Cause: Contamination with hand oils, silicone spray, talc etc. Solution: Discard and ensure future cleanliness. Air bubbles throughout and/or large depressions in top and bottom surfaces. Cause: Mold frame underpacked. Solution: Pack mold frame more fully.		White powder on unvulcanized rubber. Cause: Normal Solution: Disregard - do not attempt to clean it off. Rubber hard and won't vulcanize. Cause: Full or partial vulcanization through accidental exposure to heat and/or aging. Solution: Discard and ensure proper storage techniques. Rubber hard and stiff. Cause: Rubber frozen through long exposure to cold. Solution: Warm slowly at approximately 100°F (38°C). Excessive shrinkage. Cause: Too high vulcanization temperature. Solution: Check setting with accurate thermometer and observe recommended temperature and time. Also, reduce temperature to 290°F ( 143°C ) and double the time. Rubber does not flow into all cavities. Cause: Not packed properly. Solution: Pack cavities with scraps of rubber. Rubber does not flow into all cavities. Cause: Vulcanizing temperature is too high. Solution: Use accurate thermometer and observe recommended time and temperature.