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Molded pulp is a sustainable packaging material made from recycled paper. It can be made from any paper-based product and is cheaper than plastic. There are four types of molded pulp, and the process involves creating a pulp slurry, pouring it into molds, and drying. Pulp products are biodegradable and recyclable, making them better for the environment than plastic.
Molded pulp is a type of packaging material made from recycled and pulped paper. First invented in 1903 in America, molded pulp is a thick material similar to cardboard. It is a cheaper and more convenient alternative to plastic containers. Such pulp containers are also more environmentally sustainable and, unlike their plastic counterparts, can be recycled.
The pulp can be made from materials such as recycled cardboard, cardboard and newspaper. In fact, any paper-based product can be used. This includes items already made from molded clay that have finished their use and need to be recycled once more. The only products that cannot be used for pulping are those that contained or came into contact with unsanitary materials such as chemicals and bodily fluids.
There are four basic types of molded clay. Thick-walled molded pastes have rough edges and are used for transporting goods from one place to another. Transfer molding is a thinner version of the thick-walled mold and is sanded or finished on at least one side. The thermoformed fiber mold is a heated mold made by three-dimensional molds and vacuum forming. The final type, processed pulp, takes one of three other shapes and refines it by adding a print, coating layer, or sometimes seeds.
The exact process for making a molded paste varies depending on the function and size required. The creation of the pulp itself is a process common to all types. In fact, basic pulp can be used to create all four basic types. The paper products are fed into a pulper which crushes the products into small pieces. Hot water is then added to create a semi-liquid slurry. The pulp is then fed through a filter to remove any non-paper materials such as plastic.
The molded pulp used to make products such as egg boxes and drink stands is poured into lubricated metal molds. A vacuum pump then draws the pulp onto the mold to produce an even distribution of the pulp through the mold. Once formed, the pulp is then placed in the oven to dry. The drying time of a pulp mold depends on its size and thickness.
Disposable urinal bottles are another product made from cellulose materials. The process is slightly different, as a chemical is first added to the paste mix which makes the final product waterproof. The mold is made by dipping the mold into the pulp mixture, then vacuuming off the excess water. They are then dried and covered.
Pulp products are better for the environment than plastic. In addition to being biodegradable, they are fully recyclable, with the exception of products such as disposable urinal bottles. Pulp containers are also better for pets as they won’t cause choking and won’t break when immersed in water.
