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Woven polypropylene (WPP) sacks are tough carrying bags made from woven plastic. Machine-woven plastic sacks are commonly used in the agriculture, food, and construction industries. Despite being made of plastic, they are eco-friendly because they can be recycled to make new bags or used for other products. They can also be recycled after use, reducing landfill waste.
These sacks are made using a variety of machines and manufacturing techniques. Based on how they are created, the following types of machine-woven plastic sacks can be categorized:
Weaving machines
Highly developed machines called weaving machines knit WPP fabrics from polypropylene (PP) plastic strips. Circular weaving machines and flat weaving machines are two common kinds.
Circular weaving machines weave tubular plastic fabric without seams. They are good for making bulk bags and sacks with simple shapes.
On the other hand, flat weaving machines produce two-dimensional, flat woven fabrics. They are preferable for creating woven fabrics with complex designs and measurements. Also, they combine other processes like cutting and sewing.
Fabrication machines
Fabrication machines make WPP sacks by cutting woven fabrics into smaller parts. These machines also sew, heat seal, and stitch the edges of the sacks. Automation systems are usually used to make these processes quicker and more efficient.
Printing machines
These machines are for printing logos, labels, and patterns on WPP sacks. They use screen printing, gravure printing, or digital printing technologies to create colorful and durable prints on the surface of the sacks.
Environmental machines
These recycling machines are responsible for collecting and recycling used WPP sacks. They help reduce environmental pollution and plastic waste by changing the forms of plastic materials.
Overall, the production of WPP sacks is coordinated by several different types of equipment, each of which plays a vital role in the process from weaving to fabrication, printing, and recycling.
Machine-woven plastic sacks are made with high-tech equipment and are available in a range of sizes, weights, weave densities, and closure methods to accommodate different uses. They can have printing options on one to four sides, such as logos, bar codes, or specific customer requirements. The fabric used to make them is usually polypropylene or HDPE, and the strength of the sack depends somewhat on its weave density.
The sacks are designed to have specific weight capacities, usually in the range of 5 kg to 50 kg, but custom orders can come in larger weights too. However, if larger weights are required, it is better to use plastic pallets or frac tanks, which can come in different types of plastic. The heavier the sack, the more it weighs when empty. For example, a woven polypropylene sack weighing 50 grams could carry up to 25 kg of flour.
The sacks can be closed in several different ways, including heat seals (often a cross or crisscross pattern), scribble, stitch, plastic snap, or kittle snap. Sometimes, they are not closed at all but left as an open mouth with a drawstring, which is common when bagging rice. Drawstrings and handles are two other features that can be included in custom plastic sack orders. Other features that can be requested in custom orders are grommets and vent holes that help with breathability. Please see below for the standard maintenance practices for machine-woven plastic sacks.
Machine-woven plastic sacks are easy to clean. Woven polypropylene is water-resistant and dries quickly. Plastic woven bag manufacturers recommend that surfaces be wiped with a damp cloth. If desired, detergent can be used to wipe off any remaining dirt. Plastic sacks should be stored in a dry place but can also be kept in humid areas. When wet, they should be dried and stored in a ventilated area.
Slightly soiled areas should be cleaned with a wet towel and then dried. If there is any staining, it should be cleaned with warm water and detergent and then dried completely. If machine-woven plastic sacks smell musty, they should be air-dried until the odor disappears. Storage containers or packing boxes should be washed with soap and water and dried before storing the bags.
Machine woven plastic sacks have a variety of uses for both industrial and agricultural purposes. Below are some key industry uses for machine woven plastic sacks.
Agricultural Packaging
They are used to package and transport grains, seeds, fertilizers, animal feed, flour, potatoes, rice, beans, and other agricultural products. They have become an alternative to traditional jute and burlap sacks. Agriculture industries prefer them because they are easy to handle, cost-effective, and resistant to moisture and pests.
Chemical and Pharmaceutical Packaging
Chemical and pharmaceutical industries use them to safely package and transport chemicals, pesticides, herbicides, and fertilizers. To prevent product contamination and chemical reactions, they ensure that these products are protected from external elements and are easily stackable.
Industrial Packaging
These sacks are commonly used in manufacturing and construction industries to package and transport various bulk materials such as cement, sand, aggregate, charcoal, minerals, wagyukoku flour, calcium carbonate, and other powders and granules. Their durability, strength, and moisture resistance make them an ideal choice for protecting these materials during handling and storage.
Food Packaging
They are used for packaging sugar, salt, animal feed, rice, flour, coffee, and other food products. Food-grade machine woven plastic sacks comply with hygiene standards, preventing contamination and spoilage.
Construction and Building Materials Packaging
In the construction industry, machine-woven plastic sacks are used to package and transport materials such as砂, cement, gravel, and insulation materials. Their strength and moisture resistance ensure the materials stay dry and are protected from damage.
Retail and E-commerce Packaging
They are used to package and transport products in retail and e-commerce settings. Sacks suppliers produce custom-printed plastic bags for branding and promotional purposes. Plastic sacks are also used for product packaging in the textile, automotive, and consumer goods industries.
Woven plastic sacks have become synonymous with durability, versatility, and sustainability. They cater to a myriad of industries, ensuring both quality and convenience. The woven polypropylene bag manufacturing process is eco-friendly, as it repurposes byproducts from other sectors. As global concerns about plastic waste intensify, machine-made woven plastic bags emerge as a viable alternative, marrying functionality with environmental responsibility.
When choosing machine woven plastic sacks, it is essential to consider the material. Woven plastic sacks are primarily made from polypropylene (PP) plastic. PP woven sacks possess inherent flexibility, allowing them to stretch under pressure without breaking. This adaptability reduces the risk of product loss due to sack damage. Additionally, the lightweight nature of plastic woven sacks makes them easier to handle, transport, and store compared to traditional bulk packaging materials like jute or cotton. Woven polypropylene sacks offer a breathable packaging solution. Unlike non-permeable plastic bags, woven sacks allow air circulation, preventing moisture buildup and spoilage, especially for agricultural products.
Their moisture-resistant properties prevent damage from damp conditions. Many machine woven plastic sacks are treated with UV stabilisers, enhancing their resistance to degradation from prolonged sun exposure. This UV protection makes them suitable for outdoor storage and transportation, where UV rays are inevitable. Plastic woven sacks come in various sizes, from small to big woven sacks. Moreover, the widespread availability of plastic woven sacks makes them an attractive option for businesses. Companies no longer need to compromise on quality or pay a premium for distinct packaging solutions.
Machine woven plastic sacks can easily be customised. Businesses can opt for printed woven polypropylene bags featuring their logo or distinct designs, ensuring that their products stand out in a crowded market. Additionally, companies can choose the colour of their woven sacks to match their brand image. With numerous options available, machine woven plastic sacks offer endless possibilities.
Q1: How are machine woven plastic sacks made?
A1: The production process begins with sourcing raw materials, followed by pre-conditioning, extrusion and weaving, sewing or stitching, quality control, warehousing and distribution.
Q2: What is the difference between woven and non-woven polypropylene sacks?
A2: Woven sacks are made by weaving polypropylene threads into a fabric, while non-woven sacks are produced using a thermal bonding process that creates a more fabric-like material. Woven sacks are more breathable, whereas non-woven sacks offer better moisture resistance.
Q3: Can machine woven plastic sacks be recycled?
A3: Yes, they can be recycled. Many facilities accept woven plastic sacks for recycling, where they are processed into raw materials for making new products.
Q4: Do machine woven plastic sacks have any breathable characteristics?
A4: Yes, depending on the weave density, some machine-woven plastic sacks can be slightly porous or breathable. This feature is desirable when storing goods such as grains that need to be kept inbag that allows air circulation.
