The Effect of the Injection Molding Conditions of Plastics on the Stress Relaxation

플라스틱의 사출성형조건이 응력완화에 미치는 영향

  • 정석주 (서울산업대학교 기계설계학과) ;
  • 황봉갑 (안성여자기능대학 기계설계기술학과)
  • Published : 1998.03.01


In this study, proper injection molding condition has been studied through stress relaxation tests in order to experimentally investigate the effect of the condition on softening of mold product, using specimens produced under the different conditions according to the recommendation of resin manufactures. As a result, softening of the specimens was found to be strongly influenced by material melting temperature. The specimen with higher material melting temperature is found to have lower softening. However, softening of the specimen with lower mold temperature has an decrement, compared with other specimens. In particular, specimen with notch is influenced by mold temperature. The softening increase with higher injection speed and pressure. Finally in order to improve softening, material melting temperature, injection speed and injection pressure were found to be increased with low mold temperature.