A coating also referred to as lamination, is an additional polypropylene film that is added to the fabric. It sealed the small gaps in the poly weaves to act as a moisture barrier. This layer of film can be added to the inside or outside of the bag. To achieve a higher percentage of waterproofing on the Ssuper Sack, an inner liner of PE can be introduced into the bag for close to 99% waterproof
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Ssuper sacks are manufactured to a Safe Working Load (SWL) of 500kg to 2,000kg.
Most woven polypropylene bags are manufactured for single trip. These single use bags are rated at a 5:1 safety factor ratio (SF) that means the bag can hold up to five times the amount of their rated safe working load (SWL). For safety reasons, it is not recommended to fill up the bag over its safe working load.
Some woven polypropylene Ssuper Sacks are manufactured for multiple trips. These multiple trips bags are rated at a 6:1 safety factor ratio. It means the sack can hold up to six times their safe working load. Again, for safety reasons, it is not advisable to fill the sack over its safe working load.
U-panel bags are constructed with three body panels &#; one full length running across the front and back of the bag, and two sides fabric sewn into the larger piece. The U-panel bags form a square shape when filled, especially a U-panel bag with baffles.
Circular bags are made with a tubular piece of fabric. The construction with a single piece of fabric to forms all four sides of the bag only requires top and bottom fabric to be stitched to create the bag.
4-panel bags are constructed with four individual pieces sewn together to form a square structure. When filled, a 4-panel bag will hold its square shape the best, compared to the U-panel and circular bag. The only drawback to create 4-panel bags is the large amount of stitching required to keep the bag together. This can allow for more areas of the bag prone to failure. However, 4-panel bags are ideal for storage due to the way they hold their shape when filled.
Type A is made of plain-woven polypropylene and other non-conductive fabrics. Static electricity is generated as products move or rub against the inside surface of the bulk bag when they are filled or emptied. No static protection is found in Type A FIBCs.
PROS
To transport non-flammable products.
No flammable solvents or gases present around the bag.
Do not use type A for:
Transporting flammable products.
When flammable solvents or gases are present around the bag.
Should not be used where a flammable atmosphere with a minimum ignition energy &#;1,000mJ is present.
Type B is made of plain-woven polypropylene fabrics or other non-conductive material that have a low breakdown voltage to prevent an incident with highly energetic, and dangerous propagating brush discharges occur. Although Type B bulk bags can prevent propagating brush discharges, they are not considered antistatic bulk bags because they do not dispel an electrostatic charge.
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PROS
To transport dry, flammable powders.
No flammable solvents or gases present around the bulk bag.
Intended to be used in environments with dust with ignition energies less than 3mJ.
Do not use type B for:
When flammable solvents or gases are present around the bulk bag.
Type C, also known as conductive FIBCs or ground-able FIBCs, are made from non-conductive polypropylene fabrics interwoven with conducting threads traditionally sewn in a grid pattern. These conducting threads must be electrically interconnected as well as connected to a designated ground/earth during filling and discharging. This connection to the ground/earth during filling and discharging is imperative to the safe use of Type C bulk bags.
PROS
To transport flammable powders.
When flammable vapors, gases, or combustable dusts are present.
Do not use type C:
When ground connection is not present or has become damaged.
Resistance from any location FIBC to ground-able point.
Type D FIBCs are made from antistatic and static dissipative fabrics. It is designed to prevent the occurrence of incendiary sparks, brush discharges and propagating brush discharges from the bag to a designated ground/earth. The fabric contains quasi-conductive yarns that dissipate static electricity into the atmosphere via safe, low-energy corona discharge. It is used to package combustible products and handle products in combustible and flammable environments.
PROS
To transport flammable powders.
When flammable vapors, gases, or combustable dusts are present.
Do not use type D:
When surface of FIBC is contaminated or coated with conductive material such as grease or other flammable and or combustible materials.
Yes, BOPP plastic is generally considered safe for use in packaging. BOPP is a type of polypropylene plastic that is chemically inert and does not react with the substances it comes into contact with. It is also considered to be food-grade safe, meaning it does not contain any harmful chemicals that can leach into food or other products. Additionally, BOPP plastic is recyclable, which helps to reduce environmental waste.
However, as with any plastic material, there may be some concerns about its impact on the environment, particularly if it is not disposed of properly. It is important to follow proper disposal guidelines and recycling practices to ensure that BOPP plastic is not a hazard to the environment.
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