What Is a Sandwich Panel?

Sandwich panel products are composed of a two-layer molded metal panel (or other material panel) and a polymer thermal insulation core that is directly foamed and matured in the middle of the panel.

A board made of a high-strength surface material and a core material with a lighter bulk density and a smaller strength. Also known as

Its main advantages are:

The specific strength of the plate is high.

The core material is cheap and large, and the surface material is high and small, so the cost of producing this kind of product is low.

Reasonable selection and matching of surface and core material can effectively meet the pre-designed performance requirements of the board.

For example, metal cladding is used to improve the fire and water resistance of the board, and decorative board or plastic sheet is used as the surface layer to improve its decorative effect. ^[1]

The board was successfully researched by the United States in the late 1960s. At that time, it was mainly used in aircraft manufacturing, and gradually expanded to architectural decoration such as partitions, door leafs, floors, as well as furniture parts, refrigerator housings, and so on. Subsequently, some countries also produced one after another, so its range of use is expanding day by day, and it is an important lightweight and high-strength material. Paper honeycomb sandwich panels are the most used in China, referred to as paper honeycomb panels. ^[1]

Figure 1

The core material is a honeycomb structure material with a certain size. Kraft paper is usually rolled one-by-one with a special coating equipment on one side, and the glued parts on adjacent layers of paper are staggered at a distance of half the distance between the two rubber strips. ). The paper is stacked and glued into a stack, and then cut with a trowel to a certain width (ie, the thickness of the honeycomb core), and then the glue is solidified by heating, and the two ends are pulled apart to form a hexagonal honeycomb structure. If the adhesive position and width of the adjacent kraft paper are adjusted, other structural shapes can also be obtained (Figure 3). In order to improve the strength of the paper honeycomb structure, water resistance and corrosion resistance, the paper can be treated with phenolic resin, the amount of which is 15% of the paper, exceeding this amount, the economic benefits are poor. ^[1]

The surface material is selected according to the needs of the product. Fiberboards are commonly used for wallboards, roofing panels and door leafs of mobile homes, and plywood or veneer is mostly used for cabinet furniture. When the surface layer material and the core material are glued, the core is generally placed in a wooden frame, the thickness of the wooden frame is the same as the thickness of the core material, and the upper and lower surfaces of the core material are each covered with a glued sheet. The type of glue used depends on the material of the surface layer. If the surface layer is a wood material, urea-formaldehyde glue and phenol-formaldehyde glue can be used. Then hot pressing, the pressure used should not be too high, otherwise, the core material will be deformed or displayed on the veneer, usually 0.2 to 0.3 MPa. The glued honeycomb panel is finished after trimming, planing, edge punching (breathing) and surface treatment. ^[1]

Foamed aluminum sandwich panel has the excellent performance of foamed aluminum material, and simultaneously solves the shortcomings of low strength of single foamed aluminum. It is a new type of functional material with excellent comprehensive performance. At present, the production of foamed aluminum sandwich panels at home and abroad mainly uses the adhesive and powder metallurgy foaming methods. The foamed aluminum sandwich panels produced by the gluing process have low temperature resistance and corrosion resistance, and the product environment has certain limitations. The powder metallurgy foaming process is the main preparation method of foamed aluminum sandwich panels that have been studied in recent years. In the traditional powder metallurgy foaming process, the bonding of the core is mainly completed by the hot pressing process. The bonding strength is low, the density of the core layer powder is not ideal, and due to the limitation of the size of the hot pressing mold, it is not possible to produce large-sized sandwich panel materials. . ^[2]

1. Light weight, the weight per square meter is less than 24kg, which can fully reduce the structural cost.

2, fast installation, light weight, plug, install and can be cut freely, determine the ease of installation, improve efficiency and save construction time.

3. Fireproof, the surface material and insulation material of the color steel composite core board are non-combustible or non-combustible materials, which can meet the requirements of fire protection regulations.

4. Fire-resistant, color-coated steel plate treated with special coating is guaranteed for 10-15 years. After that, anti-corrosive coating is sprayed every ten years, and the life of the plate is more than 35 years.

5, beautiful, clear lines of the profiled steel plate up to dozens of colors, can meet the needs of any style of building

6, commonly used thermal insulation materials are: rock wool, glass fiber cotton, polystyrene, polyurethane, etc., low thermal conductivity, with good thermal insulation effect.

7, environmental protection and noise prevention, composite board sound insulation strength of 40-50 decibels, is a very effective sound insulation material.

8, strong plasticity, the profiled steel plate can be cut at will, enough to meet the needs of special design.

9, high strength, using high-strength steel plate as the base material, tensile strength of 5600 (kg / cm2), coupled with the most advanced design and roll forming, has excellent structural characteristics