More of the water is squeezed from the damp mat as it passes through a series of roller presses. The fibers mat and intertwine as paper sheets begin to take form.
There, the watery pulp slurry flows onto a moving wire cloth where most of the water drains through. The wood fibers that remain are now ready to be bleached and treated further with dyes, pigments, or additives to fit the desired grade and color before moving on to the paper machine.
These properties are what make glassine so unique. By removing the lignin, the pulp produces a paper with a neutral pH level and higher resistance to changes in chemical, structural, or optical properties. If lignin remains in the pulp during bleaching, the chemical reaction with the bleach turns the lignin into hydrochloric acid, which can make the paper brittle and discolored over time. Removing all of the lignin from the fiber during the pulping process is a crucial step in making glassine paper. This process separates the pure cellulose fibers from the lignin and other substances. The pulping process cooks the wood chips under pressure in a variety of ion solutions to break the chemical bond of the lignin (the organic polymers that form the cell walls and support tissue in plants). The first step in the papermaking process is converting the trees into pulp (the fibrous raw material used to make paper). When logs arrive at the paper mill, they are completely debarked and sent to chippers, where they are cut into pieces for mechanical or chemical pulping. Once the trees are grown to a specific size, the virgin timber is felled, stripped of its branches and twigs, and cut for transport. Glassine is made from hardwood trees, primarily varieties of aspen, oak, birch, and gum. Because it is made from wood pulp, glassine is fully recyclable and biodegradable – making it a sustainable material choice. And it’s resistant to moisture, air, and grease. As a result of the manufacturing process, glassine is pH neutral and acid free. Glassine allows what’s inside or behind the paper to show through. But glassine is a smooth, glossy paper that is transparent. When you think of paper, transparency may not immediately come to mind. And it’s not! Let’s take a closer look at glassine’s manufacturing process to see how each step contributes to the final product. Because of its unique look and feel, it may not seem like regular paper. Glassine is a pulp-based material that has been mistaken for other substrates, such as wax paper, parchment, even plastic. Unlike its name, glassine is not glass – but it does have some glasslike features.
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