With the rapid development of door and window curtain wall industry in recent years, door and window sealing strip industry is also getting more and more attention of the market. At present, door and window rubber seal strip is mainly used in plastic steel doors and Windows, aluminum alloy doors and Windows, wood doors and Windows and other architectural decoration doors and Windows. The plastic door window on the market seals by PVC, modified PVC, diethylene-c, elastomer seals (including TPV, TPE, TPR, SEBS), silicone and other materials extrusion.

So, what effect does door window seal strip have after all? As we have learned, sealant strip is in window of window of model steel door and window of broken bridge aluminium door window and door of wood door had waterproof, sealing and energy-saving main effect, sound insulation, dustproof, frost proof, heat preservation. It must have a strong tensile strength, good elasticity, also need better temperature and aging resistance. In order to ensure the fastening of the rubber strip and the profile, the section size of the rubber strip must match the profile of the plastic steel doors and Windows. Sealing tape is generally used for opening doors and Windows, hanging Windows, folding doors and Windows. Its main function is dustproof, insect-proof, waterproof, sound-proof, sealing and so on.

However, due to the current level of technology and other factors; The door window on market seals strip also is good and bad intermingled. Below a lot of circumstance, because seal rubber is chosen undeserved, make door window enterprise appeared project quality problem and rework, this is bringing economic loss to door window curtain wall enterprise while, also make enterprise reputation suffers loss. So, at present what problem can general door window seal strip appear likely? Through the survey found that the general will have the following performance：

1.Inferior door window seal strip contains a variety of harmful material (be like: the heavy metal such as dissolvable cadmium, antimony, lead carcinogen), and of these dissolvable and harmful material volatilization, can damage human body health seriously.

2.Inferior door window seals corner place to be able to appear possibly seal not tight or glue craze, cause leakage accident.

3.After receiving sunshine illuminate or be heated up, sealant strip sends stickiness, adherent go up in window and glass, still can appear sometimes "ooze oil" phenomenon, polluted door window while, also affected the sealing function of door window and beautiful.

4.Door and window sealing tape is used before long, can become hard become brittle, lost original flexibility and sealing function thereby; Cause the project has not been accepted that leakage, ventilation and other problems.

Advantages of TPE seal strip

With the development of science and technology and industrial progress in China, TPE domestic raw materials have been able to replace imported products, and gradually applied to automobiles, trains, wires, doors and Windows and other fields, TPE sealant strip ultra-high cost performance has become the best material to replace traditional rubber strip (epdm, PVC, silicone, etc.).

So what advantage does the TPE door window sealing strip that receives market favour as so have after all? Generally speaking, the main properties and characteristics of TPE sealing tape are as follows：

1.Excellent resistance to high and low temperature performance: the use temperature can reach -50 ° C to +110 ° C, in the temperature range of -20 ° C to +40 ° C, hardness change is not higher than 4HA, better than the traditional material PVC and EPDM seal.

2.Thermal conductivity is lower than 0.2w /(m•K), which is an insulation material. It can improve the insulation performance of doors and Windows and reduce energy consumption.

3.Good resilience and high tear strength: under the condition of 30% compression rate and 70℃×24h, the compression permanent deformation is 22%, and the tear strength is 50 KN/M under the test of ASTM D624.

4.Processing performance is superior: can according to profile color tailor-made all sorts of color adhesive strip, white adhesive strip, transparent adhesive strip, color even, do not fade, decorative strong, enhance the class of doors and Windows.

5.Heat welding: corner welding can fundamentally solve the problem of corner sealing lax, glue cracking, its welding process is simple, high efficiency, high welding strength, easy to install after welding, and save corner, glue and other costs, is being used by more and more high-end doors and Windows enterprises.

6.Non-toxic, environmental protection, no pollution: does not contain nitrite and other carcinogens, does not contain heavy metals, no pungent smell, no harm to the human body, the environment, belongs to the green environmental protection products. Products through SGS certification, in line with the European Union ROHS directive, especially for export-oriented enterprises.

7.Material density is low: there is no filler such as calcium powder in the production process, and the product density is 0.93-0.98, which is only equivalent to about 67% of EPDM material seal strip, and the window rate of rubber strip of the same weight is 1.3-1.4 times of EPDM.

8.Good aging resistance: the service life under normal conditions is not less than 20 years. Good tolerance to uv, acid rain, ozone, moist air and arc. Won't appear harden, flow oil, shorten wait for a phenomenon, long-term assure door window sealing performance.

9.Stable performance: qualified by "compatibility test" issued by the national architectural research institute, the product has no precipitate, no pollution to the  surface coating of window and door profiles (water-based paint and oily paint), ensure no yellow or black marks on the contact surface with the adhesive strip, and improve the quality of doors and Windows. It is compatible with structural adhesive. After 21 days of exposure under ultraviolet lamp, it has no effect on the performance of structural adhesive. It conforms to the relevant requirements of GB16776 for sealing adhesive strip for building doors and Windows.

10.Products can be recycled after recycling, is conducive to saving money and energy saving, Windows and doors because of the end of the project materials or design errors caused by worries.

The problems that should be paid attention to when using TPE/TPR instead of PVC to produce the seal strip of extruded products

In recent years, replacing soft PVC with TPE/TPR and producing extruded products (such as sealing strips) is a major trend in this industry.

1.Environmental protection and safety: PVC containing halogen (chlorine), toxic; Toxic plasticizers (such as DOP,DEHP, etc.) are added in the processing of most PVC. The burning of PVC is easy to release toxic dioxins, which have adverse effects on the environment.

2.Low temperature resistance: PVC at the temperature of -10~-5℃ is easy to harden, loss of elasticity; TPE can maintain its elasticity and hardness at the ultra-low temperature of -50℃.

Compared with PVC, TPE has the disadvantages of relatively high cost and lower flame retardant than PVC(ul94-hb for TPE, ul94-v2 for PVC).TPE is applicable to the application areas with high environmental protection requirements, good low temperature, and no higher requirements for flame retardant, such as automobile sealing strip, door and window sealing strip, children's anti-collision strip and other extrusion products.

In most cases, TPE is a perfect replacement for PVC and demonstrates its advantages (low temperature resistance, non-toxic). However, due to the difference between TPE and PVC material structure, there is a certain difference between the two extrusion process conditions.

According to the difference of the hardness of the soft PVC, can be in 110 ~ 150 ℃ under the condition of extrusion forming, TPE is in accordance with material hardness and mixing system, can type under the condition of 150 ~ 230 ℃. TPE than PVC illiquid, harder to plasticizing, therefore, screw, screw extrusion stress, the plasticizing temperature setting, etc and PVC is different. If the customer is the production of PVC extrusion before, now use TPE to replace production, and extrusion equipment is still before, at least pay attention to the screw extrusion pressure and temperature of the plasticizing paragraphs. If still according to the extrusion technology of PVC set to squeeze out the TPE products, It is easy to produce abnormal processing (such as rotten edges, surface of the surface without luster).