- Jiangxi Dongsheng Plastic Industry Co.,Ltd.
- Main products:ad*star cement bag ,block bottom valve bag ,Ad Star cement valve bags ,Ad Star polypropylene bags ,Ad Star box-shaped bags ,paper bags for cement ,PP sacks / bags with valve ,polypropylene fabric ,BOPP woven polypropylene bag , Ad Star valve bags ,BOPP Laminated PP Woven Bags – Single Side ,BOPP Laminated PP Woven Bags with Liner ,BOPP Laminated PP Woven Valve Bags
Home > Company News > Step-By-Step AD Star Block Bottom Bag Manufacturing Process
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Block bottom bags are used to transport and store a wide variety of dry flowable bulk materials.
There are two basic types: Open Mouth Block Bottom Bags and Valve Block Bottom Bags. An open mouth bag is a tube of laminated PP woven fabric with the bottom end sealed. The bag is filled through the open mouth and then closed by stitching or tape.
Valve bags are packed on equipment that deposits material into the bag via a horizontal filling spout. After filling, forces generated by the product inside the bag allow the valve to open to self-seal.
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