... design and easily operate. Single room vacuum packaging machine TW-400 TW-400 single-chamber vacuum packaging machine / vacuum pump / vacuum seal ... , printers, cooling, exhaust the entire process. After the packaging of new products to prevent oxidation, mildew, borers, damp; can extend the ... shelf life of the new product shelf-life. 1.pply voltage: 220V/50Hz 2.wer ...