With the development of science and technology and the improvement of living standards, as well as the call of the country to build an energy-saving harmonious society, doors and windows are the eyes of the building, and the loss of energy consumption accounts for 40% of the total energy consumption. Especially in 2004, the heat transfer coefficient of doors and windows (heat preservation and energy saving index) as a mandatory acceptance index has also attracted great attention and implementation of provinces and cities across the country. Energy-saving doors and windows have become the mainstream of building doors and windows. The following from the EPDM strip material, design, dimensional tolerance to talk about some of its views:

First, the importance of materials

Now most energy-saving doors and windows are made of EPDM glue. It is a copolymer of ethylene, propylene and a small amount of a third monomer. Synchronized with doors and windows), heat aging resistance, high and low temperature resistance, ozone resistance, chemical resistance, water resistance, good electrical insulation and elasticity and other physical and mechanical properties. Also known as crack-free rubber, it is recognized as the best material for the production of sealing products in the world. The main physical properties and technical parameters are as follows:

At present, the market is still full of a large number of fake EPDM rubber strips. Some manufacturers even make the slogan: How much money can customers spend to produce what brand of sealing strips. There are a few yuan a kilogram of EPDM sealing strip, but as a product of EPDM sealing strip, a small amount of EPDM rubber is added in the production. It is well known that EPDM strips are important for the formulation. If the formula does not meet the requirements, the physical properties can not be guaranteed, its superior performance can only be an empty word, a few yuan or more than ten yuan can not meet the requirements in the formula cost, there is no superior performance, can not meet the requirements of doors and windows. The expected requirements of the system can not guarantee the three-character standard and energy-saving standard of doors and windows, and can not reach the qualified energy-saving doors and windows.

The second is the importance of design ability.

According to the physical properties of the formulation (such as hardness, pressure change rate), it is very important to adjust the formulation of EPDM strip qualitatively and quantitatively and to design the mold. Make good use of advantages, such as the design of equal pressure sealing strip, first measure the profile and sample window, understand the system structure of the profile and the degree of cooperation between the profile and the hardware, and measure the measured value. If it is necessary to make up for the defects of the matching of profiles and hardware, the value of making up for the defects will be considered in the design quantity, and then the design will be optimized according to the physical properties of the rubber material, and the design will be optimized in the non-critical position, which can reduce the weight of the instrument, so as to achieve the purpose of reducing customer costs. Many manufacturers with weak design capabilities do not understand the system, blindly imitate, and do not consider the matching amount of profiles and hardware. The designed EPDM rubber strip cannot be completed, which only causes huge economic and reputation losses to the manufacturer.

Third, the importance of dimensional tolerances

Adjusting the formula and designing well is only the basic beginning to ensure the quality of the product. The control of dimensional tolerance is an important standard to measure the high and low production technical ability of a manufacturer. The qualified finished products of each batch are generally not felt by naked eyes and hand feeling.