AD*STAR® block bottom woven bags are made by extruding polypropylene resin into sheets, cutting the sheets into tapes, and weaving the tapes into the tubular fabric. The tubular fabric is then laminated, cut, and converted into a finished bag. The following information demonstrates the basic steps in manufacturing a poly woven block bottom bag.
Starlinger Company supplies integrated bag converting machinery to produce the woven valve bag from start to finish. Production steps include:
Tape Extrusion: High-strength tapes are produced by stretching after the resin extruding process.
Weaving: Tapes are weaved into tear-proof flat fabric in circular looms.
Coating: A thin layer of PP film is laminated to the woven fabric. Or additional BOPP film applied which can offer more eye-catching print and marketing effect.
Printing: Both flexo print and gravure print up to 8 colors, can be printed on the bag fabric.
Slitting: Top, bottom, and valve patches are pre-cut for the converting line.
Converting: Using Starlinger machines, sacks are assembled by forming the block bottom and applying patches and the valve using hot air sealing technology. No glue is used to seal the bag.
Baling: Bags are palletized and baled. Normally 8,000 bags can be baled in a single pallet.
AD*STAR® Bag Specifications and Sizes
Specifications
Type: Block Bottom Valve
Material: Coated PP Woven fabric
Construction: Single Ply: Woven Poly
Two-Ply: Woven Poly + BOPP
Two-Ply: Woven Poly + Kraft Paper
Tape Width: 2.5mm – 5mm
Fabric Weight 50 – 80 gsm
Coating Weight: 17 – 25 gsm
Valve Material: Woven PP, PE Film, Non-Woven Spunbond
Perforation: Adjustable Levels of Perforation
Valve Type: Standard Internal, Tuck-in, and Ultrasonic Seal
Bag Size Min. & Max.
Width: 11.81 – 23.625 Inches
Length: 17.72 – 35.83 Inches
Bottom Width: 3.15 – 7.00 Inches
Need Customized Woven Poly Valve Bags Now?
Since beginning,we have considered quality is the top priority by adopting and apprehending advanced and modern European technology and equipment.
We released its new and preeminent type of packaging product to cement producers, feed-ingredient producers and other agricultural raw material producers: the block bottom valve bags with the annual capacity of 50 million pieces.
One of the leading suppliers of packaging products in China. Customers are our focus in all plans, policies and strategies. Product quality determine the survival of the enterprise.
Block bottom valve bags are made of 100% polypropylene, sealed bottom and top with hot air sealing.
Block bottom valve bags are made of 100% polypropylene, sealed bottom and top with hot air sealing. Prints are available up to 03 colours/side.
PP woven bags are produced from PP woven fabric. The typical colour is milky white with one outer coating layer.Mainly used by animal feed, feed,ingredient or fertilizer product.
Block bottom valve bags are made of 100% polypropylene, sealed bottom and mouth by hot air sealing, suitable for packing raw material, feed- ingredients, fertilizers, chemicals (powder) and cement. Another layer of kraft paper or PE coating can be added inside of the bag. Produce with European technology, block bottom valve bag is a superior type of product in comparison with traditional packaging products with prominent features as follows: High strength, no breakage and spillage of goods Micro perforation with good air permeability Better printing quality and design Gentle dimension, storage space saving Competitive cost.
KPK bags have 03 layers: 01 outer kraft layer – 01 middle woven PP layer– 01 inner kraft layer kraft. Top and bottom are stitched with cotton thread and kraft paper band. Prints are available up to 03 colours/side. Dimension and weight are customized as per requests with packing weight is 50 kg each bag. Suitable for packing cement.
PP woven bags are produced from PP woven fabric. The typical colour is milky white with one outer coating layer. Bags are inserted an additional PE (polyethylene) inner layer for a further strength as per customer’s request. Besides, a combination of PP woven bag and BOPP outer liner may be preferred for fertilizer packing. A wide range of printing options. Customers may choose multi-colour printing with flexo printing or gravure printing. Dimension and loading capacity are customized from 10kg to 100kg. Our packaging products are manufactured by using technology and equipment from Starlinger&Windmoller&Holscher. Our typical products are PP woven bags, KPK bags and block bottom valve bags.
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