Strap-in-pocket curtains are a traditional type of PVC curtainsider curtain in which the vertical webbing straps pass through dedicated internal pockets sewn or welded into the curtain rather than being high-frequency bonded directly to the PVC. They remain a popular choice for many operators and fleets, particularly where they wish to match an existing trailer specification or simply prefer this style of construction.
The principle behind strap-in-pocket construction has been discussed within the industry for many years. Some operators believe that separating the webbing from the curtain material provides greater integrity under load, while others prefer curtains with high-frequency bonded webbing. There is no recognised standard or published test that demonstrates one construction method is inherently superior to the other for unrated curtains, so the choice is generally based on fleet preference rather than proven performance differences.
How strap-in-pocket curtains are constructed
Instead of bonding the vertical straps directly to the inside face of the curtain, each strap passes through its own internal pocket. Although the straps can theoretically move within these pockets, in practice there is little or no movement because they are secured by the roof roller assembly at the top and the buckle assembly at the bottom.
Operator preference
Many fleets continue to specify strap-in-pocket curtains because they are familiar with the design or wish to maintain consistency across an existing trailer fleet. Others prefer high-frequency bonded webbing. As neither construction is inherently required for standard unrated curtains, either solution may be suitable depending on the application.
Replacement curtains
Sapphire Curtains manufactures strap-in-pocket curtains for new builds, replacement curtains and refurbishment projects. Although replacement curtains are often manufactured to match an existing design, there is generally no requirement for an unrated curtain to replicate the original construction. The most important requirement is that the replacement curtain is manufactured to the correct dimensions to ensure proper fit and operation.
EN 12642-XL bodywork
It is important to distinguish standard strap-in-pocket curtains from curtains supplied for EN 12642-XL rated bodywork. Sapphire's curtains for EN 12642-XL applications do not use strap-in-pocket construction. Instead, they employ high-frequency bonded internal reinforcement or Powermesh as part of the overall certified body design.
