structural core material is a lightweight and high-strength material that can be produced from a variety of raw materials, including basa wood , PVC foam, polyurethane foam , PET foam. These lightweight material bonded between the two composite skins and acts as the central component of the " sandwich structure ". This structure makes the composite lighter!
panel can be almost any material . In the composite materials industry, the most common panels are glass fiber and carbon fiber board . There are currently a variety of core materials to choose from, with a wide range of performance and cost. It can be mainly divided into: light industry, hard foam, honeycomb, etc.
light wood
light wood, also called basa wood, grows in tropical forests in the Americas. It is one of the fastest growing trees and the lightest wood in the world. Bare wood has a high aspect ratio and an orientation of unit cells to bring the grains toward the direction of maximum stress. Light tools have extremely high strength and hardness (weight ratio); they are small in specific heat and are less affected by temperature changes; they have good fire resistance, heat resistance and sound insulation properties.
light wood has a good record in entertainment ship hulls, military aircraft, naval ships, vehicles, wind turbine blades and corrosion-resistant industrial tanks. For example, the sandwich materials required for wind power blades are mainly balsa wood and structural foam materials, which can be used together or just balsa wood .
PVC foam board
alloy foam material based on vinyl polymers through an aromatic polymer polymerization network. Customarily called crosslinked PVC foam core material, it is an ideal core material for composite sandwich structures.
This product has excellent comprehensive mechanical properties, stable chemical properties, the highest cost-effectiveness, density range of 40~250kg/m3, excellent specific stiffness, specific strength, good fatigue resistance, good impact resistance, thermal insulation, good flame retardancy, low water absorption rate, not prone to moisture and mildew; isotropy; good dimensional stability and processability. It has been widely used in wind power, water boats and other fields.
PU polyurethane foam board
polyurethane rigid foam is a polymer polymer made of isocyanate and polyether as the main raw materials. Under the action of various additives such as foaming agent , catalysts, flame retardants, etc., mixed with special equipment and spraying on-site foaming through high-pressure spraying. There are two types of polyurethane foam: soft foam and hard foam. Soft bubbles have an open-cell structure, while hard bubbles have a closed-cell structure; soft bubbles are divided into two types: crusty and non-crusty.
PET Foam
PET (polyethylene terephthalate) is a lightweight, recyclable thermoplastic plastic. PET foam is a type of closed-cell thermoplastic structural foam with certain shear and compression strength. Therefore, it is often used in sandwich structure core materials and is widely used in construction, road transportation, rail transit, aviation, communication, wind power and other fields.
PET Foam has the characteristics of high strength, high temperature resistance and low price. The PET foam core material has better fatigue resistance, which is better than some PVC foam core materials. Structural foam materials are mainly used in structural bottom plates, roofs, side plates, and rear portions in rail transit vehicles. The main advantages are that they can reduce the weight of the vehicle body, insulation, sound insulation, enhance safety, and save fuel costs. Structural foam materials are commonly used in ship bottoms, decks and superstructures in the field of ship manufacturing.
PMI structural foam
Polymethacryimide (PMI) structural foam material is a high-performance foam core material with heat and fire resistance and other properties, excellent mechanical properties and low density. The disadvantage is that the price is relatively high and the global output is relatively small. Application in the fields of aerospace, medical equipment, and communication equipment.
SANStructural foam
styrene -acrylonitrile copolymer (SAN)Structural foam material has good mechanical properties, good toughness, high temperature resistance, and uniform density distribution. The disadvantage is that a large amount of waste is generated during the production process, and the recycled material cannot be regenerated by melting. The gas is released after high-temperature processing, which is resistant to styrene erosion. At the same time, the environmental cost of the product is high during the production process.
cellular
various types of artificial cellular cores are widely used in the aerospace and transportation industries. honeycomb material includes paper, aluminum, phenolic resin impregnated glass fiber, polypropylene and aramid fiber phenolic treated paper. Density ranges from 1 to 6 lbs /fᶟ. Physical properties depend heavily on the specific material and density. honeycomb core can make extremely light panels.
Fiber Reinforced Core
Fiber Reinforced Composite Core Technology combines glass fiber and closed-cell foam in one engineering structure to create a very effective sandwich solution with very high mechanical properties. It is ideal for use as a material for static applications requiring high stiffness and can also replace wood and plywood .
Core fabric (laminated bulk)
uses various materials to produce products called core fabrics or laminated bulk. The purpose of these products is to create a barrier to prevent printing out or rapidly increasing the thickness of the laminate. In most cases, the core cloth is a nonwoven material using polyester filaments that are bonded into a pad-like ink-absorbing paper configuration. These products are soaked with resin and laminated similar to glass fiber reinforced materials.
strong core felt
strong core felt is a felt that is mainly composed of polyester fiber or glass fibers and micro-pellet spheres, and is bonded into a whole body by a styrene-soluble adhesive.
Using strong core felt can significantly improve the stiffness of the product and prevent the printing of cloth patterns, playing an irreplaceable role in improving the quality of molds and products. Therefore, strong core felt is widely used in the production of various fiberglass molds.
strong core felt as a lightweight material, it has been widely used in ships, automobile parts, amusement facilities, sanitary ware, etc.
