Custom Release Paper
In the face of an ongoing liner shortage caused by a lack of investment in paper mills over the last decade, companies are now looking to polyethylene terephthalate (PET) as a replacement. It's an efficient and environmentally-friendly solution, says Jeoren Diderich, VP of Sales & Marketing for Avery Dennison North America.
A paper liner is used to protect equipment from adhesives that may stick to it during mounting or to originals when a rewinding and stripping process is carried out. A release liner can be made from a variety of paper or film substrates, such as super calendared papers, clay-coated Kraft papers, polyethylene-coated papers, polyesters and polypropylenes.
Several factors affect a paper release liner's performance including: its adhesive system, substrate compatibility and heat resistance. When selecting a release coating, it is important to consider these issues and choose the chemistry that will provide a high-quality product.
Rayven produces a wide range of custom silicone coated paper release liners for a broad array of applications and substrates. A typical liner consists of a super calendared or clay-coated paper with a silicone coating applied. The liner is then pressed through a Calender stack to create an extremely flat, smooth surface that is ideal for high-speed stripping and dispensing.
When a customer requests a specific paper or film, 3 Sigma will work with the client to produce a custom liner that precisely meets their application requirements. This can include a combination of a specific basis weight and release value as well as a pattern or full-coat.
X-Ray Inspection of Silicone Coated Paper
To evaluate the performance of a custom release liner, 3 Sigma uses a range of X-Ray scanners to measure coating thickness, including Spectro/ASOMA and Oxford Instruments. This allows the team to assess any potential coating problems that might arise in a production environment and ensures the best possible product.
Shear Testing of Adhesives and Thick Coatings
The shear properties of an adhesive or coating are important to understand before applying it to a roll. Shear testing can be performed on a standard test tape, such as Tessa 7475, or with a PSTC unit to simulate actual shear conditions.
Additional shear test methods include the TMI 49-70 digital measurement tool and a spectroradiometer for measuring elongation. The spectroradiometer can also be used to detect surface tension and pore size, which can help identify any potential sizing concerns that could affect a product's final appearance or performance.
Alliance(r) Release combines an optimized formulation and proprietary coating to deliver versatile performance in a wide variety of printing and converting applications. Enhanced dimensional stability and layflat properties make it easy to run on high-speed stripping and dispensing equipment, while its differentiating, two-side coating and calendering capabilities provide countless options for customization.
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