Formed pulp, also called pulp or shaped fiber, is a packaging material typically made from recycled cardboard and / or newspaper printing paper. It is used for protective packaging or for food service containers and beverage carriers. Other typical uses are end caps, bowls, plates, bowls and bowls.
For many applications, pressed pulp is less expensive than expanded polystyrene (EPS), sucked molded PET and PVC, corrugation and foams.
Formed pulp is often regarded as a sustainable packaging material, as defined by the Sustainable Packaging Coalition, as it is made from recycled materials and can be recycled after its life cycle.
Molded pulp products can be made waterproof with a spray or dip coating of wax.
These products usually have wall thicknesses of 1/16 "to 1/4" and are mainly used for support packaging applications. Thick-Wall is also commonly referred to as "Slush Molded". The surfaces are very rough on one side and smooth on the opposite side. The product definition is moderate due to the use of relatively inexpensive single passes and the use of mixed recovered paper and kraft paper slurries. Typical applications are edge and edge protection, heavy product packaging, car spare parts, pulp pallets, etc.
Transfer molded products are usually thin-walled, 1/16 "to 3/16", and are the most widely used type in use today. The method employs vacuum forming and transferring or transfer molding, the form being an extremely fine wire mesh in the form of the upper / exposed surface. The fiber slurries often consist of a high percentage or entirely of recycling time, which on the one hand has a relatively smooth surface and on the opposite side a fairly smooth surface with good accuracy and definition.
Prior to the molding operation, the mesh is paired with a vacuum chamber which draws water through the mesh into the chamber, the mesh form being suspended above a liquid return tank. The fibrous slurry is sprayed from below onto the mold and the vacuum attracts the slurry close to the web and fills all the interstices and interstices. When the airflow has been sufficiently blocked by the lattice, the excess slurry falls back into the recirculation basin, and the mold advances the drying process, followed by the separation of the lattice form from the dried fiber cladding.
Typical applications of transfer molding parts are for the packaging of electronic devices, mobile phones and other household and hardware articles. High-performance high-speed extrusion presses are used for the production of drinkers, bowls, wine merchants, egg cartons, egg pots, pulpurinals, fruit floors, slippers, pans, end caps,
This latest form of molded pulp is the highest quality of thin-walled products available today. The method uses "Cure-In-The-Mold" technology that produces well-defined, smooth shaped molded pulp products. After molding, the product is captured in heated molds that press and compact the molded products. They are precisely shaped and have the appearance of plastic. The products are ejected from the heated molds in their finished state, as opposed to drying in a heated oven. Typical uses for this type are for point-of-purchase packaging and those applications where high definition and appearance are of paramount importance.
This type of molded pulp product is that which has undergone some kind of secondary processing which is generally different from or in addition to the basic manufacturing process. This could apply to any of the first three types. The secondary processing could be coating, printing, hot-pressing, stamping, trimming or manufacturing using paints or special slurry additives. Uses are for many types of customer specific applications.