Description
Polypropylene woven bags – also called PP sacks or woven PP sacks – are one of the most widely used packaging formats in European agriculture, food processing, construction, and chemical industries. They are produced by weaving flat polypropylene tapes on circular looms into a strong tubular fabric, which is cut to length, hemmed, and stitched at the base (and optionally the top) to form a bag capable of holding 10 to 50 kilograms of product reliably through filling, palletising, transport, and storage.
The woven structure gives PP sacks a combination of tensile strength, tear resistance, and breathability that is not matched by comparable paper, jute, or polyethylene sacks. The bags are robust enough to stack 10 or more high on pallets, resist puncture from the coarse, dense, or granular products typically packed inside them, and withstand the mechanical handling at both filling and end-user stages.
Specifications and Customisation Options
PP woven bags are available in a range of fabric weights (grams per square metre), bag dimensions, and closure styles. Standard bags are supplied open-mouth with a stitched bottom, ready for filling on a vertical filling line. Valve sacks with a self-closing valve at one corner are used for powdered products where dust-free filling is needed. Laminated PP bags (with a thin PE coating on the inner surface) provide a barrier against moisture ingress and are used for products such as animal feed, fertilizer, and food ingredients where humidity protection is needed.
Printing is available in up to six colours using flexographic methods applied to the bag surface before cutting and stitching. NovoPacks can supply plain bags for customers who apply their own labels, as well as fully printed bags incorporating brand graphics, product information, regulatory text, handling symbols, and batch coding.
Frequently Asked Questions
What is the maximum weight a PP woven bag can hold?
Standard PP woven bags are produced in sizes suitable for 10 to 50 kilograms of product. The maximum safe fill weight depends on the fabric weight (gsm), bag dimensions, and the specific product being packed. For products at or above 25 kilograms, heavier fabric weights and reinforced stitching are recommended. NovoPacks can advise on the correct specification based on your product density and fill weight requirement.
Are PP woven bags suitable for food products?
Yes. PP woven bags for food applications are produced from food-grade polypropylene resin without harmful additives, and comply with applicable EU food contact regulations. For products requiring a moisture barrier or a food-safe inner surface, laminated PP bags with a PE inner coating are available and widely used for flour, sugar, rice, animal feed, and similar products. Please specify your food contact requirement when requesting a quotation from NovoPacks.
What is the difference between laminated and unlaminated PP woven bags?
Unlaminated PP woven bags have small gaps in the woven fabric that allow some air and moisture movement, which can be beneficial for products that need to breathe (such as fresh root vegetables) but is a disadvantage for moisture-sensitive products. Laminated PP woven bags have a thin polyethylene film bonded to the inner surface, closing these gaps and providing a moisture barrier. Laminated bags are the standard choice for flour, sugar, pet food, fertilizer, and chemical powders where moisture ingress would damage the product.
Can PP woven bags be printed with company branding?
Yes. Flexographic printing in up to six colours is available on the bag surface. Graphics, logos, product descriptions, regulatory text, nutritional information, handling symbols, and barcode data can all be incorporated. Print quality on woven PP is good for solid colours and line art; photographic images can be reproduced but at lower resolution than is achievable on smooth film substrates. Minimum order quantities for printed bags vary by design complexity – contact NovoPacks for a printing quotation and artwork requirements.
Are PP woven bags recyclable?
Unlaminated PP woven bags are made entirely from polypropylene and can be recycled where polypropylene film and fabric recycling infrastructure exists. Laminated PP bags with a PE coating are a mixed polymer material, which complicates mechanical recycling – though take-back and recycling schemes for agricultural and industrial PP sacks are developing in several European countries. Many countries have producer responsibility schemes that include PP sack packaging – NovoPacks can advise on the current position for your market.