Paper cores are tube-shaped structures made from wood pulp in the form of durable kraft paper, fiberboard, recycled paper, and paper-adhesive composites. They often hold wrapped materials, like textiles and plastic wraps. Paper core manufacturers use different materials and design them in two kinds: spiral wounds and convoluted or parallel wounds. Here are the materials used to make paper cores:
Kraft Paper
Most paper cores consist of one, two, or more layers of Kraft paper. Kraft paper is a robust, biodegradable material generated from wood pulp. Its strength, rigidity, and durability make paper cores an appropriate option for industrial applications. Paper core manufacturers may incorporate Kraft papers for the liner (innermost layers) and the wrap (outermost layers).
Fiberboards
Fiberboard is a sandwich of several linerboards and cardboards glued together to make a system of zig-zag patterns. The material is versatile and light, making it a good choice for companies that need a high number of paper cores. Fiberboards are customizable to meet your branding and product needs, making it easier to label paper cores.
Recycled Paper
Some paper core designs come from recycled cardboard paper or paperboard fibers to minimize the environmental effect of using fresh wood pulp. The fibers go through a repulping process to separate and decontaminate them. The material and processing can make the paper cores without compromising the product’s strength. Once processed, the materials wrap around a mandrel in layers and bonded with adhesives.
Paper-Adhesive Composites
The plies or layers of fibers in this type of core have a low contact area. Adhesive composites fill the space between piers and penetrate the materials. Paper adhesives bind the layers of fiberboard, cardboard, or Kraft paper together and improve the paper cores’ structural integrity. These binding ages can be water-based or starch-based. Resin or starch-based paper adhesives for special uses require additional resilience or moisture resistance.
Coatings
Coating materials can create residue-free unwinding and total tape release. They can improve the paper cores’ performance in moist conditions. Manufacturers utilize products like cellulose films or silicon surfaces that give the paper core a polished coat with no residue when removing different films or adhesive tapes. They can also use other materials like wax or resin to improve surface smoothness. The coating may depend on the uses of the paper cores. Paper cores for food packaging require non-toxic and eco-friendly materials.
Additives
Additives improve the strength of paper cores depending on their intended use. Industries like textile fabricators require products that meet flame resistance requirements. Manufacturers fuse additives like flame retardants into the paperboards to boost the product’s integrity in high heat. Heavy-duty or repetitive use requires stronger-than-average paper cores. Strength enhancers can be introduced into the adhesive composites or applied to the paper materials.
Contact Paper Core Manufacturers Today
Paper cores have different applications and are made of various materials. Wood pulp is the main raw material for the components used to manufacture them. Paper core manufacturers may use fiberboards, cardboard, paperboards, or Kraft paper. They also use additives and adhesives to improve the paper core’s performance and structural integrity. Contact your local paper core manufacturers today and learn more about the process and the different types of paper cores available.