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Selection (single choice): Since polypropylene is a crystalline polymer, its molding shrinkage rate is relatively high, generally falling within the range of ( ), and it exhibits significant post-shrinking. Orientation is likely to occur during the processing stage; therefore, these factors must be taken fully into account when designing the mold and determining the process parameters. A: 1%-2.5% B: 2%-3% C: 2%-2.5% D: 1%-2% A: 1%-2.5%
A: 1% - 2.5%~~~~~~~~~
Since polypropylene is a crystalline polymer, it has a relatively high molding shrinkage rate, generally within the range of (A), and exhibits significant post-shrinking. Orientation is likely to occur during the processing stage; therefore, these factors must be taken fully into account when designing the mold and determining the process parameters. A: 1%-2.5% B: 2%~3% C: 2%~2.5% D: 1%~2%
Since polypropylene is a crystalline polymer, it has a relatively high molding shrinkage rate, generally within the range of (A), and exhibits significant post-shrinking. Orientation is likely to occur during the processing stage; therefore, these factors must be taken fully into account when designing the mold and determining the process parameters. A: 1%-2.5% B: 2%~3% C: 2%~2.5% D: 1%~2%