Sumatra black tea bag production involves withering, CTC (crush, tear, curl) processing for intense flavor, fermentation, and drying. The tea is then packed into bags via automated machines, which form filter paper, fill, seal, and attach strings/tags using staples or thermal bonding to produce finished tea bags. 

This video shows the step-by-step process of tea bag production:

The Sumatra black tea is often produced via the CTC method to ensure a bold flavor that suits high-capacity automated bagging lines, with some producers utilizing pyramid-style mesh for better infusion. 

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For more specific information on the machinery and process, you can explore the Sengongpack Sumatra Black Tea Bag Production Process. 

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