The Ultimate Guide to Polypropylene Bags - S&K Packaging

Sandbags, animal feed bags, and bags to contain grains for human consumption must be sturdy, tear resistant, and available in water- and UV light-resistant versions. The ultimate guide to polypropylene bags we provide below will give you an appreciation of the strength, versatility, and variety of uses woven polypropylene bags provide.

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What Is Polypropylene?

Polypropylene is a thermoplastic polymer resin. “Poly” means many. Polypropylene is made by subjecting propylene (a petroleum byproduct) molecules (monomers) to a chemical reaction that makes the molecules combine into a large “networked” or chain molecule, called a polymer.

Polypropylene has many attractive qualities that make it an excellent material for making packaging. Polypropylene is (or can be) made to be:

• Transparent, unlike plastics, which aren’t perfectly clear
• Nontoxic, so it’s considered appropriate for food packaging
• Lightweight
• Resistant to UV light
• Heat tolerant
• Inexpensive

How Polypropylene Becomes a Bag

Polypropylene resin pellets are heated, then extruded into strips, like thin, flat tapes. For nonwoven polypropylene (PP) bags, these strips are bonded together to make a smoother type of plastic bag. Woven PP bags run the filaments or threads for polypropylene through an industrial loom. The loom weaves them into a fabric with warp and weft (meaning horizontal strips weave over and under vertical strips).

The weaving machines create large rolls of fabric, and from those rolls, the woven polypropylene goes through cutting and sealing or sewing machines to turn the fabric into bags.

Both woven and nonwoven PP bags can undergo lamination to make them more amenable to printing and more durable. Woven bags are stronger than nonwoven bags and can carry more weight than a nonwoven bag of the same size.

Types of Polypropylene Bags

Woven PP bags are a versatile type of packaging used by suppliers of flowable, bulk products, including animal feed, grains, seeds, powders, and resins. Types of woven PP bags include:

• FIBC bags: “FIBC” stands for “flexible intermediate bulk container.” These are large square or round bags that can hold up to 2,000 pounds of material. They’re either open-top or have spouts for filling and emptying. They also come in a duffel-bag style. They can have structural baffles to enable them to stand up on their own, and they come with corner straps that make them easy to hoist with a forklift.
• BOPP bags: BOPP stands for “biaxially oriented polypropylene,” and the bags are laminated to accept detailed printed graphics and to render them waterproof and resistant to grease and oils. They have a glossy appearance and preserve required labeling on animal feed or other packaging.
• Gusseted bags: These have an extra panel that enables them to stand up straight.
• Lined bags: Woven PP bags are not inherently waterproof. However, they can have an additional lining of plastic film or foil to protect the contents from moisture.
• Retail shopping bags: Because they are reusable and nontoxic, woven PP bags make excellent totes for groceries. Other retailers like them because they can print logos and designs that will last on the bags.

Advantages of Woven PP Bags

Our ultimate guide to these bags wouldn’t be complete without an explanation of the advantages of woven PP bags. Manufacturers and suppliers of flowable bulk and dry goods love these bags for a variety of reasons. Among the advantages of woven PP bags are:

• Durable and reusable: You can reuse woven PP bags for years if you handle them properly.
• Strength and tear resistance: Their structure makes woven PP bags strong and tear resistant.
• Sustainability: Woven PP bags are entirely recyclable.
• Chemical resistance: Polypropylene is resistant to most alkaline or acidic substances and organic solvents.
• Heat resistance: Polypropylene has a high melting point and is resistant to heat exposure.
• Easy to clean: PP bags are easy to clean for re-use.
• Pest resistant: Their toughness makes woven PP bags resistant to pests, protecting the product inside.
• Breathability: These bags allow for airflow for products that need it.
• Accept coatings: Lamination makes them resistant to humidity and liquids, and a UV light-resistant coating protects graphics and contents from sun damage.
• Cost-effective: Woven polypropylene bags are inexpensive, considering savings on transportation, product loss, and spoilage.

Common Uses for Woven Polypropylene Bags

Many manufacturers and distributors use woven polypropylene bags to store or transport products. Examples include:

• Food packaging: Polypropylene’s nontoxic nature makes it food-grade packaging. This makes the bags an excellent choice for packing grains, flour, sugar, corn, and other products intended for human consumption.
• Agricultural materials: Woven polypropylene bags are useful for storing and transporting animal feed, fruits and vegetables, or even fish food.
• Construction: Woven PP bags are an uncomplicated way to store and transport construction materials like concrete mix or plaster.
• Flood control: Woven PP bags with liners make effective sandbags to divert floodwaters and prevent them from entering structures.
• Geoengineering: Woven PP fabrics and bags help create or maintain roads, irrigation channels, ports and harbors, railways, and mines.

What To Consider When Looking for a Supplier

If you are a manufacturer, distributor, or retailer in need of packaging material for flowable dry goods, consider working with a supplier that can provide you with a variety of choices. Woven PP bags, including FIBC and BOPP bags, may be just the right thing.

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On the retail end, BOPP bags, with their high gloss lamination that can accept sharply detailed graphics on the inside of the laminating film, stand out on shelves with color and images that won’t fade or crack.

For transporting or storing large quantities of dry goods, FIBC bags with structural baffles, spouts, or duffel bag closures could work. Find out if your supplier can provide bags with corner handles, top and/or bottom spouts, or electrostatic protections for materials that could generate static electricity through friction with the bag.

Another consideration is the supplier’s ability to print your chosen graphics on your bags in the colors you want.

At S&K Packaging, we offer several options for woven PP bags. We also offer paper bags, paper-poly combination bags, and packaging supplies, including twine, bulk bag repair tape, and industrials sewing machine thread. Contact us today to discuss your need for paper, paper-poly, FIBC, or BOPP bags.

PP woven bags are very popular in the plastic industry. We will see some aspects of this packing type.

What is PP woven bags

PP woven bags are bags made of PP plastic in the woven method.

Woven, or weaving is a method by many threads or tapes woven in two directions (warp and weft), to form a fabric for plastic industry needs.

Polypropylene (PP), is one kind of thermoplastic resin material produced by the polymerization of propylene.

Woven polypropylene is polypropylene strips/threads that have been woven in two directions (warp and weft) to create a light, but strong and heavy-duty material.

Woven polypropylene bags: Build with circular woven polypropylene fabric, one side sewn as the bottom, leave the other side open, the simplest woven polypropylene bags are done.

For more information, please visit woven polypropylene sacks.

Benefits of using PP woven bags

• Woven cloth is flexible.
• It is able to retain its shape well.
• Woven fabrics are strong, therefore, bags can be reused multiple times.
• Bags can be put in the washing machine.
• It can be designed in a laminated or matte finish. Non-laminated woven bags are not recommended as they will have a cheap look.
• The bags do not degrade when wet.
• They are naturally resistant to tearing.
• Bags can be printed on one side or both sides.
• Bags allow the contents to breathe until air-dried.
• These bags have better burst strength than plastic bags.
• PP woven sacks can be laminated as the vapor and moisture barrier.
• Moreover, bags can be partially transparent for an outstanding presentation.
• Bags also can be side gusseted to accommodate bulky items easily.

Applications of PP woven bags

• Agricultural product packaging: PP woven bags are largely used in storing and transporting agricultural products such as aquatic products, feeds, fruits, vegetables, etc. PP woven bags used in the agricultural industry typically include feed PP woven bags, chemical PP woven bags, fertilizer PP woven bags, vegetable weaved bags and fruit mesh bags.
• Food packaging: PP woven bags are increasingly used to pack food. Common food woven bags include rice PP weaved bags, flour PP woven bags, maize woven bags, etc.
• Geotechnical engineering: PP woven fabrics are extensively used in the construction of irrigation works, roads, railways, ports, mines, buildings, and more. Having the functions of filtering, draining, isolation, and anti-seepage, PP woven fabrics are one of the most popular geosynthetics.
• Tourism and transport: Temporary tents, sunshades, and various travel bags can be made by PP woven fabrics. In addition, plastic woven fabrics can also be used as fences and screens during construction.
• Daily necessities: PP woven bags are almost used by everyone, whether workers, farmers or cargo agents, etc. You can find plastic woven products (such as shopping bags, logistics bags, etc.) in stores, warehouses and houses, nearly everywhere.
• Flood control products: Woven bags play an important role in reducing or preventing the detrimental effects of floodwaters. They are widely used in the construction of dams, river banks, roads, and railways. Woven polypropylene sandbags are widely used all over the world.
• The special woven bags: The special woven bags also are used to serve some special purposes. For example, UV resistant woven bags have UV protection and anti-aging function, allowing them a longer lifespan in the sunlight. Woven polypropylene tube with UV protection can be used for earthbag buildings.