Two loops bulk bags

Types of two loops bulk bags

Two-loop bulk bags are manufactured in distinct types. The type is dependent on the material to be packed and demanded system handling.

• Circular bulk bags

  Circular bulk bags have uniform side walls and a circular design. This makes them suitable for loose materials such as grains, powders, and pellets. Even distribution and stability are characteristic of these bags. This results in easy handling by ensuring even weight distribution within the bag. They are most commonly used in food and chemical industries because of consistent safety and performance.

• Coated bulk bags

  A plastic-coated bulk bag features a protective exterior coating. It is useable for moisture-sensitive or powdery materials like cement and chemicals. This coating prevents moisture, dust, and other contaminants from penetrating the bag. Thus, it maintains the integrity of the contents. Coated bags have different thickness levels. This allows users to select packaging according to specific needs.

Design of two loops bulk bags

Two-loop bulk bags, which are sometimes called FIBC bags or big bags, feature a simple design. This includes two reinforced lifting loops at the bag's top. The design allows the bulk bag to carry materials that weigh a thousand kilograms. Common applications for these bags are in construction, agriculture, and mining. The two loops facilitate crane lifting for efficient handling regarding fabric type. It is worth noting that woven polypropylene is water-resistant and durable. This makes it a more suitable option than other materials for these bags.

• Top design

  These bags have a very open top. They are meant to ease the filling process. This filling is often done using chutes or conveyors. Some have tops that are drawstring or Velcro. Such types help in securing the contents and minimizing spillage during transport.

• Bottom design

  They feature different bottom designs. These include a flat, discharge spouts, or a bulk base. A flat bottom provides stability when the bag is stacked. Spout bottoms allow controlled discharging of materials. This makes them suitable for operations that require precise measurements.

• Sidewalls

  The side walls of two-loop bulk bags are usually woven polypropylene fabric. This fabric is strong and lightweight. The weave gives flexibility and strength. This allows the bag to carry heavy loads without ripping or tearing. The fabric is also slightly porous. This helps prevent the build-up of pressure within the bag, which could otherwise occur during transport or storage.

What is made of

Two-loop bulk bags are normally manufactured from woven polypropylene (PP). This thermoplastic polymer is popular because of its durability and flexibility. The weaving process creates a strong mesh-like fabric. It allows the bags to contain large quantities of materials without ripping or tearing. Here is what they are made of:

• Reinforcements

  The two loops at the top of these bags are reinforced. This ensures that the bag can be safely lifted when full. The loops are stitched with strong nylon or polypropylene threads. This prevents them from tearing under heavy loads.

• Sewing patterns

  These loops are normally designed using a cross or box-stitched pattern. This distributes the tension evenly across the fabric. Doing this increases the overall safety and stability of the bag during handling.

• UV resistance

  These bags can be treated with ultraviolet (UV) inhibitors. These inhibitors offer protection from sun exposure. This is particularly important for outdoor applications where the bag's material may degrade due to prolonged UV exposure.

• Linings

  Linings are sometimes added to two-loop bulk bags. These include additional layers of fabric. In most cases, they are inner polypropylene sheets. They provide extra protection for moisture-sensitive materials like chemicals or agriculture products. The lining acts as a barrier. This prevents moisture and adds an additional strength layer to the bag.

• Static electricity

  The type of fabric used to manufacture two-loop bulk bags is highly combustible. Some bags are manufactured with anti-static materials. This reduces the risk of static electricity build-up. This makes them suitable for carrying flammable powders like chemical products.

How to choose

Selecting the right two-loop bulk bag depends on a few variables. Such factors are the material to be packed, working load limit (WLL), and handling methods. Here are some key considerations for making the right choice:

• Safety working load limit

  The limit that a two-loop bulk bag can withstand when safely used is referred to as the working load limit (WLL). This limit should correspond to the weight of the material to be used. Never exceed the bulk bag's WLL. Doing so will lead to structural failures and compromised safety.

• Material compatibility

  Two-loop bulk bags are manufactured with woven polypropylene (PP). This material is a type of thermoplastic polymer. It is UV resistant and water-proof. Each material has its unique properties. For example, polypropylene has high tensile strength. On the other hand, woven fabric is resistant to abrasions. This makes it ideal for heavy and sharp materials.

• Bag size

  The required bag size is determined by the volume of the material to be stored. Measuring the dimensions of bulk bags will help meet an ideal volumetric requirement. This ensures that there is neither overfill nor underfill. Choosing an appropriate size helps maintain stability during transportation and storage.

• Filling and discharge

  Consider features like filling and discharge openings. Some have spouts or drawstrings. Others have wide tops and bottom hems. Choosing the ideal option will ease the packing and unpacking process. It will also reduce downtime.

Q&A

Can two loops bulk bags be reused?

The reusability feature of two-loop bulk bags depends on the initial use. The condition of the bag after it is used and the type of material it carries determines whether the bag is reusable or not. Bags that store non-hazardous materials like sand or grains can be washed and reused. This makes them economical for users who need repeated use. However, those that store hazardous materials will need to be disposed of once.

How long do two loops bulk bags last when exposed to the outdoors?

Often, two-loop bulk bags are manufactured using woven polypropylene. Uv-treated bulk bags can last between one and three years when exposed to outdoor conditions. This durability is especially used in construction and agriculture, where bags are often left exposed to the elements.

Can bulk bags be useful for firewood storage?

Yes, the bags can be useful for firewood storage. They have a breathable fabric that prevents moisture trapping and allows air circulation, helping to keep firewood dry and ventilated. This property makes them ideal for outdoor use, as they help prevent mold and mildew development on the wood due to dampness.

Do bulk bags have a tare or net weight indication?

Most bulk bags are not manufactured with tare or net weight. However, some custom bags can be manufactured with printed weight labels. Generally, woven polypropylene fabric is used to manufacture these bags. This material's light density does not add considerable weight to the bag.

Can two-loop bulk bags be useful for storing liquids?

Although they are primarily designed for dry bulk materials, there are lined options. Such bags have inner linings that offer additional protection. These include nylon or polyethylene. They increase the suitability feature for liquids. However, the liquid's weight must be considered to prevent exceeding the bag's WLL.