Expander roll specialist
Osaka Senshoku Machinery Co., Ltd.
With over 70 years of specialized technology and experience, we eliminate wrinkles and shrinkage in films, paper, metal foils, and nonwoven fabrics.
Osaka Senshoku Machinery Co., Ltd.
The difference between flat expander rolls and expander rolls (how to choose the best wrinkle removal method)
For design and production engineers who want to remove wrinkles from their production lines but are unsure whether to choose a flat type or a curved (bow) type: Osaka Textile Machinery, a pioneer in domestically produced expander rolls, explains the differences in their structures and key points for maximizing wrinkle removal effectiveness.
Features and mechanism of flat expander rolls
This roll has a "straight structure" that uses the tension of internal elastic cords or similar materials to pull the web (sheet or film) outwards, smoothing out wrinkles.
▼ Benefits
The biggest advantage of this roll is that, because the roll itself is not curved, it is easy to keep the web's direction of travel (path line) in a straight line.
▼ Points to note when implementing
Due to its structure, the widening effect may be insufficient in environments with high line speeds, conditions involving strong tension, or harsh work sites where a strong wrinkle-removing effect is required.
The overwhelming wrinkle-removing performance of the expander roll (curved type).
This is our flagship product. The internal shaft itself is curved in an arc shape, and the rubber sleeve on the surface rotates over it, generating a powerful and stable widening force.
▼ Benefits
Its physical, bow-shaped design pushes wrinkles outwards, resulting in extremely strong spreading force. The simple bearing structure prevents slippage even with ultra-thin films, and special materials such as "fluororubber" can be freely selected to suit the site.
▼ Points to note when implementing (principle of passing through the center) Due to its curved structure, the line must be designed and operated so that the web always passes through the "center" of the roll. It is not suitable for lines where the product flows extremely far to the edge (off-center).
[Important] Regarding optimal roll selection and quotation
"Ultimately, which is best suited to our company's production line?" The correct answer varies greatly depending on the film material, thickness, tension, and the condition of the production line (such as whether or not there is center misalignment). Incorrect selection will not only be ineffective but will also directly lead to product loss. Before making a decision yourself, please consult with us, experts in web handling. We will provide you with a quote based on the optimal specifications that will fundamentally solve your company's challenges.