Inspect every layer
Confirm whether the product-contact liner is separate from the woven outer bag.
Material & process guide
Close woven PP bags by the required finish.
Woven polypropylene bags may be sewn directly, folded before sewing, tape-bound, or combined with a separately sealed liner. The correct route starts with the bag structure and the required finished closure.
01Bag structure
Uncoated or coated woven PP; with or without PE liner
02Required finish
Direct stitch, folded top, tape binding or liner seal plus sewing
03Line conditions
Bag width, filled height, conveyor direction and target bags per hour
01 · Selection path
Close woven PP bags by the required finish.
Woven polypropylene bags may be sewn directly, folded before sewing, tape-bound, or combined with a separately sealed liner. The correct route starts with the bag structure and the required finished closure. Selection guidance, not a performance guarantee.
Define the finished top
Use a sample or photo to specify fold, stitch count, crepe-tape binding and thread trimming.
Match the line
Confirm conveyor height, bag spacing, voltage and upstream filling arrangement.
02 · FIT CHECK
Where this process fits
Selection guidance, not a performance guarantee.
Good starting conditions
- The outer bag can be mechanically sewn
- A repeatable bag-mouth position can be presented to the machine
- A sample bag is available for stitch and fold testing
Confirm another process when
- The product-contact liner must be hermetically closed first
- The bag top cannot be held consistently on the conveyor
- The required barrier result has not been defined
03 · EQUIPMENT
Related equipment
Selection guidance, not a performance guarantee.
04 · DIRECT ANSWERS
Questions buyers ask
Selection guidance, not a performance guarantee.
Can a woven PP bag be sewn without folding?
Yes, some woven PP bags are closed by direct sewing. Folding or tape binding is chosen when the required finished top calls for it.
What changes when the bag has a PE liner?
The liner and outer woven bag are separate layers. Confirm whether the liner must be heat-sealed before the outer bag is folded or sewn.
Which data affects machine selection?
Bag material, layers, width, filled height, required closure, target output, voltage, conveyor height and a real sample all affect selection.
Does one machine fit every woven bag?
No. Coating, liner construction, bag stiffness and the required closure can change the required process and equipment combination.
Prepare the bag data before asking for a quote
Send the bag material, layers, width, filled weight, target output, voltage and a photo of the required finished closure.