Coating is a moisture barrier applied to the inside of the woven polypropylene bags. A common type of "coating" is a 0.35 mm thick lamination of heated polypropylene, which is laminated to the inside of the fabric. The lamination provides a moisture barrier to protect the contents of the bulka bags. Since the fabric is made from a woven material, bulka bags are not "waterproof". Lamination is simply a moisture barrier, however the use of an internal poly liner works better in many typical applications. It still is not 100 per cent water proof. Liners and lamination are designed to keep water away from the product.
- What is a perimeter band?
A perimeter band is a band sewn around the outside perimeter of the top of a bag, which is designed to give extra strength to loops when lifting.
A B-lock is a spout accessory designed to assist in the closure to the spout. It is a quick and easy way to close a spout, manually regulating the flow of product. The device locks quickly and easily, and replaces the normal tie usually sewn to a spout.
A UV inhibitor is an additive that is added to the resin during the extrusion process. It will assist in protecting the bulk packaging from the harmful effects of UV rays, thereby protecting it from degrading and becoming unstable and unsafe.
- What does sift proofing or sift resistant sewing mean?
Sift proofing is designed to prevent product from leaking out of the bulka bags. As Bulk Bags are sewn together, there is the possibility of product leaking out of seams and areas where it has been sewn. Sift proofing or anti-sift sewing is a method of using a felt or a spongy type yarn in the sewing process. The sewing operator feeds the sift cord along the seam of the bulk bags while sewing. The sift cord fills in the areas near the needle hole in the seam. When using felt as a sift-resistant material, the felt is sewn either along with the threaded seam or in between the fabric panels. There are many ways to utilise sift proofing in FIBCs.
- What is chain and overlock stitching?
There are several styles of stitching used when sewing FIBCs. Chain and overlock stitching are two of the most common styles used. Chain stitching is series of looped stitches forming a chain-like pattern. Overlock stitching sews over the edge of two pieces of fabric. Many manufacturers use this style of stitching to ensure a tight seam in woven sacks, which assists in reducing sift occurrences.
Bulk density is the property of the product that you are filling into the bulk packaging. It is the mass of the product divided by the volume it occupies. The volume includes the space between particles as well as the space inside the pores of individual particles.
Safe Working Load. A bulk bag's safe working load is the amount of weight that it is rated and tested to hold safely.
Standard bulk bags are rated at a 5:1 Safety Factor, which means that the bag is specified to hold five times the amount of its safe working load. A 5:1 Safety Factor is for single use or single trip bulk handling products.
A duffel top is typically a 50 cm high "skirt" sewn to the top of bulka bags. The duffel usually comes with a tie allowing the user to secure the duffel closed, at the same time allowing the user full access to the product.
- What is the difference between duffel top and open top?
The main difference between the duffel top and open top is the duffel itself. An open top bag is simply missing a top closure, which means that the product is exposed.
A standard fill spout is a spout with an opening in the top (centre) of the bag, usually 50cm long. It's designed to allow the user to minimise dust occurrences as the bag is being filled. Spouts can be customised to fit individual applications.
- What are lift loops (straps)?
Lift loops are the means by which a forklift can raise FIBCs with its forks. In other words, they are loops attached to the four top corners of the bulka bags to enable a fork truck operator to put the fork in and lift. Lift loops can be customised to any workable size
- What is a lifting sleeve?
A lifting sleeve is a tube of polypropylene fabric used as a lifting application, designed to allow the forks of a forklift to fit into the sleeves and lift the bulka bags.
Baffles are pieces of fabric that are sewn to the inside corners of a bag to maintain its cube shape after filling. The baffles have holes that allow the product to flow freely through them. The baffles also prevent the bulk bags from bulging, which makes them stand up straight and in turn allows the bulk bags to be more efficient in their use of space.
- What is does Circular FIBCs refer to?
Circular bulk bags are made from fabric that has been woven on a circular loom. The fabric is woven into a continuous tube of fabric, which is then cut to the correct size height.