SWL: indicates the maximum weight that the big bag can safely bear, which can be 500kg, 1000kg, 1200kg, 1250kg, 1500kg or 2000kg according to the customer's request.

SF: The safety factor of the bag is the ratio of the actual strength of the bag to its SWL. which can be 5:1 or 6:1. For example, SWL=1000kg, SF=5:1 means that the big bag will break under the test machine only after its load reaches 5 times its SWL (5000kg). Most of the big bags are used once. The safety factor of these big bags is 5:1. But the safety factor of reusable bags should be 6:1.

The type of Big Bag fabric can be cylindrical or flat according to its sewing type. The weight of this fabric is determined according to the SWL and SF of the big bag. The greater the weight of the fabric, the stronger it is and the more resistant it is to physical damage, which is generally 140-220 grams per square meter. - 20 grams per square meter. This layer makes the big bag more impervious to water and moisture. The color of the fabrics is mostly white, but it is possible to produce in various colors according to the customer's request.

Anti-UV: Big bags are mostly made of polypropylene, which, like other polymers, are destroyed by sunlight over time and tear as a result of the degradation process, but fortunately, there are UV stabilizers that minimize the degradation process. and make the big bags last longer under the sun. Jolfa Ares Paraplastic Company uses the best UV stabilizing brands so that the big bags produced by this company have the longest shelf life when exposed to sunlight.

Antistatic: This additive is added to the big bag to prevent the absorption of dust particles.

Depending on the customer's needs, there are different systems for filling big bags.
Open head: The simplest and cheapest big bag filling system that does not close after filling. And it is used for packaging materials that are not sensitive to moisture and sunlight.
open head
Box door: a flat cloth is sewn to one side of the big bag and closed with straps on the opposite side

Box door
Lining entrance: Lining is a light laminated or plain fabric whose height is proportional to the dimensions of the big bag and is sewn all around the upper edge of the big bag. Leaf inlet is a suitable method for systems without automatic filling.

Leaflet entrance
Funnel inlet: suitable for systems with automatic filling and can be simple or protected. The material of the inlet funnel can be laminated or non-laminated fabric. Its dimensions are determined according to the customer's filling system.

Funnel input
The inlet funnel is suitable for systems with automatic filling and can be simple or protected. The material of the entrance funnel can be laminated or non-laminated fabric. Its dimensions are determined according to the customer's filling system.

Depending on the customer's needs, there are different systems for emptying the big bag.
Bottom of the package: which is cut to discharge the bottom of the big bag

Outlet funnel:
which can be simple, simple shielded, star or solar shielded. Having a protector for the output funnel prevents the output funnel from being damaged during transportation. The output funnel can be made of laminated or non-laminated fabric. Its dimensions are determined according to the customer's drainage system.

Big bags should be lifted and transported with a forklift according to standard instructions. The big bag should be symmetrically raised and lowered and avoid the sudden movement of the forklift. Forklift horns should not have sharp edges and should be as round as possible. Big bags should not be lifted with steel wires or ropes.
The types of loops for lifting jumbo are as follows:

Four standard categories: which is the most common lifting system. In this way, big bag loops are placed in each square and the forklift lifts from all four loops at the same time. The free part of the rings can vary from 25 to 60 cm depending on the type of lifting.

lifting
Cross Corner Loops: In this case, the straps are sewn to the body at 8 points in the right corners. In this type of big bags, cylindrical fabrics are used for the body.
  Colon winch loops: This mode is similar to the standard four handles, except that the handles are connected two by two by another strap.

Colon winch loops
Tunnel loop: In this case, a fabric of the body material is sewn in a tunnel form on two opposite sides.

The shape of Big Bag stitching is as follows: chain stitch, double chain stitch and overlock-chain stitch
sew sew sew
Big bag sewing is in four modes in terms of seam sealing:
Standard sewing, in this case, only thread is used, and it is used for big bags, which are filled with material in the form of coarse granules.

Standard sewing
Sewing with a single layer sealer (single dustproof) which is used for packing crystalline materials such as sugar or fine granules.


Sewing with single-layer sealant
Sewing with double dustproof, which is used for packing small materials such as flour or quartz, etc.

Sewing with double layer sealant
Sewing with triple dustproof, in this case, a flat sealant is placed in the middle of two fabrics and a round sealant is placed under the seams on each side. This type of stitching is used for packing powder materials and dust, plaster and materials that are filled under pressure.


Sewing with three-layer sealant
The threads used in sewing Big Bag have high strength. In case of using fibrilized thread, they are 4500 denier and in the case of multifilament, they are 3000 denier.

Usually, a document envelope is placed on the big bags so that the customer can put the necessary information about the product he fills inside. This envelope can be in A5, A4 sizes and vertically or horizontally on the seam of the top panel, side or The big bag is sewn in the middle of the body and its opening can be with or without a zipper. In addition to the envelope, the label documents are also used in the sewing of the big bag, which can include the specifications of the big bag manufacturer, type, size, SWL, SF, information about standard test methods, as well as pictures about how the big bag is transported. .