| 摘要 |
The present invention provides a process for production of expansion-molded articles of linear low density polyethylene resin which comprises compressing pre-expanded linear low density polyethylene resin beads having two melting points when measured by differential scanning calorimetry, the lower melting point and the higher melting point being designated TML and TMH respectively, at a temperature between the two melting points, the peak fusion area at TML being designated AL and the peak fusion area at TMH being designated AH, and satisfying: 5% ? AH/AL ? 80% under gaseous pressure, filling a mold with said compressed beads, said mold being capable of being closed but not sealable, then venting the mold and, heating and fusing with steam in such a state that the compressive rate of the pre-expanded beads immediately before heating with steam compared to the original pre-expanded beads is maintained at 5 to 60%, thereby to produce the molded article in the shape of the mold. These molded articles of linear low density polyethylene have a minimized dimensional shrinkage rate (good dimensional accuracy) and excellent fusion rate and surface appearance and can be produced at a high rate. |
