Views: 97 Author: Site Editor Publish Time: 2024-10-28 Origin: Site
The main function of composite core material is to offer stiffness, strength, and continuity across a structure without considerably increasing weight. Whether a core material is over-molded with self-skinning decorative cover/flexible foam or fixed between two composite skins to create a sandwich panel, it acts as the foundation or core member of a structure. There’re three popular close cell rigid foams: PVC, PET and PMI. The functionality of foam board mainly includes mechanical properties, thermal management, acoustics, combustibility and others.
The biggest advantage of foam core material is light weight. The sandwich board with foam material as core has a little weight increase, but can obtain stronger performance.
Cross-linked PVC foam core, for the reticular structure of the molecular chain, consistent performance in all directions, with excellent specific stiffness, specific strength, compression, tension, shear, bending and other mechanical properties are excellent, can be combined with a variety of face materials to form a sandwich composites, which can greatly enhance the mechanical properties at the same time, almost no increase in weight, it is the ideal sandwich composites, has been widely used in the use of sandwich composites in Almost every field, including wind energy, marine (recreational sports, military, etc.), rail transport, new energy and other markets. The main moulding method. phase transition of mixtures such as PVC from a viscous flow state to the formation of a polymer gel, and additionally, the decomposition of chemical blowing agents to form nitrogen, which dissolves in the polymer gel to form fine bubble cores. Through the reaction of isocyanate and water and further starting components, a polymerisation network is formed that can harden the PVC foam body (forming a reticulated structure), and ultimately the raw sheet is produced through processes such as expansion curing, and can then be processed into finished products such as slices.
Continuous extrusion foaming with inert gas injection under supercritical conditions.Environmentally friendly, high-capacity foam.PET foam core is better performance than PS/PU and other foams.Thermoplastic, non-toxic, recyclable.
High mechanical properties material (better than most rigid foams).
High temperature resistance - can be used for molding and hot press can molding at 140℃ and above.
Low dielectricity - very low dielectric constant and dielectric loss, suitable for structural substrates and covers that need to emit and transmit microwaves (e.g., aircraft radomes).
Low Aluminum Equivalent - Used in bed panels for medical testing equipment to obtain clear images at the lowest possible radiation dose.
PVC : Excellent performance, no obvious shortcomings, the disadvantage is that it is not recyclable and toxic to burn.
PET: Environmentally friendly, thermoplastic recyclable, poor performance, need to increase weight to achieve target performance.
PMI: Excellent performance, high temperature resistance, good wave permeability, expensive.
PVC high-strength closed cell structure foam products have excellent comprehensive mechanical properties, stable chemical properties, and high cost performance. They can be combined with a variety of surface materials to form sandwich composites, which can greatly enhance the mechanical properties without increasing weight. They are ideal sandwich materials for high-strength lightweight structures, and have been widely used in wind power, water boats and other fields.
Foam core, glass fibre and resin are cured by vacuum infusion or hand lay-up process through large moulds.
Differen parts in Yacht use different density of PVC, below the waterline, the engine base will use a higher density.
Foam core sleeve, glass fibre and resin cured by vacuum infusion process through large moulds.
PVC can be replaced by PET for blades up to 60 metres.
Head and part of the bathroom, through a large mould, the foam core, glass fibre and resin are cured and shaped by vacuum infusion or hand-lay-up process.
Kitchen and bathroom, interior components and flooring, sandwich panels formed by laminating with aluminium alloys and other skins by means of structural adhesives.
Today pet as an environmentally friendly material replaces pvc in subway.
PVC foam core as lightweight intermediate reinforcement with carbon fibre prepreg or common glass fibre resin layer.
PVC high-performance sandwich materials have a wide range of applications in military square pods, naval vessels (composite ships, etc.), large unmanned aerial vehicles, and high-efficiency carbon fibre products.
Applications of PET Foam Core
PVC foam core material with excellent performance, high cost-effective to become the mainstay of the foam core material in a wide range of fields have a wide range of applications. PET foam core material and PVC foam core material has a complementary and competitive relationship, in the environmental protection and the price has a significant advantage, limited by the mechanical properties of many places can not reach the use of the requirements. PMI foam core material is suitable for high-end areas.
