What is the difference between a hot press and a cold press?

The main difference between a hot press and a cold press is their working principle and application field.

A heat press is a machine that uses high temperature and pressure to process materials into the desired shape. It is commonly used to process materials such as metals, plastics, ceramics, etc., and can make a variety of parts and products. The working principle of the heat press machine is to heat the material to a certain temperature and then apply high pressure to make it form the desired shape in the mold.

The advantage of the heat press machine is that it can manufacture high-precision, high-strength products, but it requires high energy consumption and cost.

A cold press is a machine that uses low temperature and high pressure to process materials into the desired shape. It is commonly used to process materials such as wood, paper, rubber, etc., and can make a variety of parts and products. The working principle of the cold press machine is to put the material into the mold and then apply high pressure to make it form the desired shape in the mold.

The advantage of the cold press machine is that it is able to manufacture a large number of products, but the precision and strength are low.

Therefore, the choice of hot press and cold press machine depends on the requirements of the material, shape, precision and strength of the desired product.

First, the nature is different.

The essence of cold pressing is to use the characteristics of plastic deformation of metal to make the microscopic convex peak on the surface of the workpiece continuously flattened. The metal under the convex peak is not only pressed down, but also extruded from the valley on both sides of the convex peak, which reduces the microscopic unevenness and thus obtains a small surface roughness.

During hot pressing, the fibers are in close contact with each other, and the mutual diffusion movement of the lignin and hemicellulose macromolecular segments that were originally in a bound state and the macromolecule itself is gradually strengthened until the intermolecular gravity and hydrogen bonds interact, so that the interface disappears and the gluing process is completed.

Second, the definitions are different.

Cold pressing: that is, crimping (with tools such as crimping pliers) is used for wire ends and terminals when wiring, instead of welding, and no heating treatment is required.

Hot pressing is a process in which the heating cluster of the slab after pavement molding is pressed at the same time to make a fiberboard with certain mechanical strength and water resistance. Whether it is a wet process for the production of rigid or semi-rigid boards, or a dry process for the production of rigid or medium density boards, they are hot-pressed to become sheets.

Third, the principle is different.

The cold pressing operation requires a special cold pressing press with a fixture, as shown in Figure 18-1. Using this (typical) working method, the workpiece (cavity blank) is fixed in a precisely shaped retaining ring. This helps to control the flow of metals and guarantee a favorable particle structure.

Compared with the so-called free cold pressing, which is only used once for occasional seepage, the tightness of the green body in the mold hoop contributes to the accuracy of the cold pressing.

In the production of rigid boards by hot pressing wet method, no adhesive is generally added, and the bonding between the fibers is mainly completed by the adhesive action of the intercellular layer material of the wood cells and the filler between the fine fibers that make up the cell wall.

【Heat Press】

A hot press is a device that heats two pre-applied tinned parts with flux to a temperature sufficient to melt and flow the solder, and after curing, forms a permanent electrical and mechanical connection between the parts and the solder. Depending on the product, the heating rate can be selected. The titanium alloy indenter ensures uniform temperature, fast heating and long service life.

The indenter is specially designed to be horizontally adjustable to ensure that the components are evenly pressurized. Numerical control of temperature, clear and precise. A digital pressure gauge is available to preset the pressure range.

Areas of use:1Mobile phone manufacturers 2Touch screen manufacturer 3Computer 4Printer 5membrane switches, etc.

Cold press] Cold press, that is, refrigeration dryer compressor. The amount of water vapor in the compressed air is determined by the temperature of the compressed air: Lowering the temperature of the compressed air reduces the amount of water vapor in the compressed air while keeping the compressed air pressure basically constant, and the excess water vapor condenses into a liquid.

The refrigeration dryer (refrigeration dryer) uses this principle to dry compressed air using refrigeration technology.

Field of use: used in furniture production, speakers, wood, decoration, plastics, flat plywood, plywood, particleboard, veneer and other wood glued press parts processing and production. High production efficiency, suitable for the production of wood products components in various furniture production units and other industries.

Reference].

The difference between the two: cold pressing is carried out at room temperature, and hot pressing is carried out above 100.

Cold pressing is a loose powder composed of particles at room temperature under a certain pressure and under an instrument to make a green body with a certain shape, size, strength and density. Generally, the cold pressing process is used in powder metallurgy, ceramic industry, and tablet production. There are two types of force loading: one-way and two-way.

The hot pressing pressure, hot pressing temperature and hot pressing time are called the three elements of the hot pressing process. The actual hot pressing process is the result of the combined effect of the state of the slab (wood raw materials, adhesives, moisture content, etc.) and the hot pressing elements.

Cold press, no heating device;

The hot press heats the material to be processed and processes it!

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