Fitted PE and Aluminum-Film Liners for Existing FIBCs
For moisture-sensitive powder in an existing square-bottom FIBC, start with the inner footprint, neck position and moisture limit. The catalog has a square-bottom aluminum-film liner reference; ask about fitted PE separately. Compare both with matching water-vapor test conditions and check the seals and sleeve fit on the final sample.
Before requesting a sample
- The starting specificationTake width and depth at four base points and a useful height without stretching the woven shell. Record body shape and separately nominate flat or formed liner geometry.
- Inputs for your first reviewSend empty outer bag dimensions, requested fit and a sketch of the liner neck.
Inside measurements for a square base
Qingdao Novapack Packaging Co., Ltd. supplies these catalog options. Send your specifications so we can identify the construction, sample details and records you need for the quoted product.
Measure the support surface inside the bag, the usable height and the locations of the necks. Include a drawing or photo that makes the measurement points clear.
Record body shape and separately nominate flat or formed liner geometry.
Use the result to rule out unmatched models before requesting a production quote.
For a like-for-like barrier comparison, request water-vapour transmission rate in g/m²/day for each exact structure at matching temperature and humidity. Assess film and finished seals separately.
Compare catalog candidates
| Catalog candidate | What the description shows | What to confirm for your order |
|---|---|---|
| Custom Square-Bottom Aluminum Film FIBC Inner Bag for Moisture Protection – 86 × 96 × 120 cm | 86 × 96 × 120 cm square-bottom aluminum-film liner example | Distinguish deployed bottom dimensions from outside bag measurements |
| Custom Aluminum Foil Inner Membrane for Jumbo Chemical Packaging Bags – Square Bottom, 0.12 mm | Square-bottom foil membrane with 0.12 mm listed | Ask for actual laminate layers and water-vapour comparison conditions |
| Custom Aluminum Foil Container Inner Bag for Packaging and Storage | Additional aluminum foil inner bag construction | Confirm neck and seam format; quote independent fitted PE as a separate enquiry |
Technical reference ASTM F1249 water vapor transmission
Film Conversion and Seal Layout
A fitted liner is cut and sealed into a base, body and neck sized for the bag. The foil laminate and PE film are different structures, and the folds and seals become part of the finished liner. Request exact layer information and apply matching temperature and humidity when comparing water-vapor transmission.
Technical background Cast and blown film processing
FIBC Liners, Coatings and Closure SelectionFilm cutting and sealing establish bottom shape, seams and neck alignment. Note how seam positions sit against the outer bag and how folds enter the closure.
Ask for the assembled liner drawing and seal locations in addition to film data.
Water-vapour data at stated conditions
Request the test method, temperature, humidity, units and sample thickness. Use comparable test conditions when you line up barrier figures from two constructions.
- Compare WVTR at matching conditionsWater-vapor transmission data is comparable only when the methods, temperature, humidity and stated units agree. Film results and assembled seal integrity answer separate checks.
- Acceptance recordAsk for report details for the specified film and seal evidence for the final liner.
Neck, closure and liner attachments
Mark the upper and lower openings and their closure points. Check whether the liner needs attachment or slack to work with the filling and discharge equipment.
| Technical check | Identify where the liner passes through each bag opening and how it is held during fitting and closure. Mark the usable neck length after assembly. |
|---|---|
| For approval | Use separate top and bottom interface entries in the liner file. |
A sample that folds and sits correctly
Use an empty bag to check where the liner folds and how it reaches the corners. Record contact points, trapped folds and fit at the neck before the material trial.
Observe folds at corners and at the lower sleeve in the nominated empty outer bag. Identify excess film or short reaches that could interfere with access.
Photograph each neck and the base against the intended outer bag code.
Seals matched to powder handling
Look at the seam or weld and request records relevant to the powder and handling conditions. The seal review belongs alongside the barrier figure in the qualification file.
- Evaluate closure with the actual contentsA fitted shape should be assessed against the buyer's handling conditions and intended closure. Keep material-contact or barrier requirements with the exact assembly.
- Acceptance recordRecord the test method, sample ID and observations by closure point.
The liner file for repeat orders
Record the material layers, dimensions, tolerances, seal details and lot information. Keep the version on the sample, quotations and order paperwork aligned.
| Technical check | Keep film grade, construction and seal drawings under one revision. A change in film or neck position should appear clearly on future quotes. |
|---|---|
| For approval | Require affected dimensions and evidence to be referenced in the acknowledgment. |
The bottom shape on the bench
An empty liner on a flat surface makes it easier to see the base folds and their position. Compare this with the internal bag footprint and the frozen drawing.
- Read the formed base on the benchLook for fold congestion or seal placement at the bottom corners. Mark the points that need to lie flat when the insert sits in the woven shell.
- Acceptance recordCompare the bench photo with a fitted sample photo before you sign.
A fitted-liner sample enquiry
Send the bag drawings, powder details, neck and closure dimensions, storage conditions and barrier target. Ask us to identify the candidate membrane and quote the sample separately.
Send the outer bag drawing, contact conditions, target barrier data and closure sketch, plus volume and destination.
Ask for a fitted PE and laminate comparison only where both options meet the stated needs.
Contact and Quote Details
Send your specification or a reference sample and include the order quantity and destination. Use the inquiry form to start your request. Send drawings or sample photos by email.
- Contact the Qingdao teamTell us what you pack or protect, and identify the operating condition that makes or breaks your purchase. Put the reference sample or drawing number in the message subject so it stays with the order.
- What the factory can reviewAttach the necessary evidence and ask for a sample, drawing review or quotation as the first deliverable.
Junfeng Road, Qingdao, Shandong, China
- [email protected]
- +1 404 203 0971
- Phone
- +86 18506421208
Continue your review
Compare fabric coating, a fitted insert and the actual closure at the bag openings.
Follow the handoff from a signed sample to the packed order and receiving records.
Include a drawing or current bag reference, what you pack, the equipment, quantity and delivery destination.