Material Analysis
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Large Performance Differences Between Different Batches of Block Copolymer Polypropylene Raw Materials
Problem Phenomenon
After changing the raw material batch number, the product shows dimensional deviation, appearance changes, or performance fluctuations.
The melt flow rate, density, molecular weight distribution, etc. of different batches of raw materials differ, causing the process parameters to be readjusted.
Cause Analysis
（1）The melt flow rate (MFR) of different batches of raw materials fluctuates
（2）The molecular weight distribution and crystallinity of different batches of raw materials differ
（3）Raw material supplier change or production process adjustment
（4）The raw material storage conditions and time are different, and the performance changes
（5）The content of additives (such as antioxidants, lubricants) differs
Solution
（1）After each batch of raw material arrives, test key indicators such as MFR and density, and compare them with the standard values
（2）Establish a batch management system, use different batches of raw materials separately, and mix batches when necessary
（3）When changing the batch number, adjust the process parameters, and conduct trial mold verification before production
（4）Communicate with the supplier and require control of the performance fluctuation range between batches
（5）Use raw materials on a first-in, first-out basis to avoid excessively long storage time
Key Takeaway
Batch differences are caused by fluctuations in raw material production, and a complete incoming material inspection and batch management system needs to be established.
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