Webbing sling color code and dyeing process

Different colors of webbing slings represent different tonnages, and different tonnages also have different webbing widths. According to the European standard EN 1492-1+A1:2008 and Chinese standard JB/T8521-2007, so the tonnage is distinguished by color:

• 1 ton sling: purple

• 2 ton sling: green

• 3 ton sling: yellow

• 4 ton sling: gray

• 5 ton sling: red

• 6 ton sling: brown

• 8,15 tons sling: blue

• Above 10 tons sling: Orange

• Stage Sling: Black

• Polypropylene slings: white

Detailed sling specifications can also be found:Eye To Eye Webbing Sling.

We can identify tonnage by color, which applies to both round slings and webbing slings.

Other ways to distinguish tonnage

Dealing with color, the tonnage can also be determined by the number of black braided lines on the belt skin of the sling, e.g. how many black braided lines means how many tons. It can also be identified by the tag at the eye of the ring location.

Dyeing process 

In addition, the color of the sling requires the factory to have professional dyeing equipment, and it is also important that the color is bright and correct

1.Polyester Sling Process

Into the belt - pre-washing - pre-drying - coloring tank - pre-drying (infrared) - high temperature baking - post-washing (reduction washing) - post-drying - drop belt.

The role of infrared pre-drying is to make the dye molecules initially attached to the fiber, to prevent color bloom and other problems.

The role of high-temperature baking is to make the dye molecules fully into the fiber, to complete the process of dyeing fiber.

The role of reduction cleaning is to make the excess dye molecules to decompose, to ensure the color fastness of the product.

2.Polypropylene white webbing sling process

Into the belt - coloring tank - hot steam steaming - after washing - after drying - drop belt.

The role of steam is to make the acid dye molecules fully react with the corresponding functional groups in the fiber to complete the process of acid dyes on the fiber.

The role of washing is to remove the dye molecules that have not reacted completely to ensure the color fastness of the product.

The obvious difference between polyester sling and nylon sling is that the former is baked at high temperature after coloring, and the latter is steamed with hot steam after coloring.