The reason is that the melt flow in the cylinder, the flow between the cylinder wall and the inner wall of the difference, when leaving the die, the whole melt and no resistance, the gap between the two becomes zero. It is the relative movement of the layers of the change, causing the mold at the melt flow of intense oscillation, leading to the occurrence of such phenomena!
1, ajouter des auxiliaires: comme des additifs de silicone organique (additifs de plastique de silicone) ou des additifs de polymère de Fu Fu (PPA).
2, the appropriate increase in temperature can also improve the melt flow!
Presser le tuyau en PEHD, et parfois à cause de la température, et parfois à cause du type de problèmes de matière première et de motifs plus ou moins, mais parfois, il faut augmenter la température, changer le modèle en plastique ou combien. Il a été testé sur la tête de membrane de l'anneau d'air au-dessus de votre tête, ou à cette altitude.
3, choose the rest assured HDPE pipe first to determine the appropriate material. In the past, the pipes used for water supply were mainly cast iron pipes. Outside the main sand cast iron pipe, indoor use of galvanized cast iron pipe, which can be divided into cold (electric) galvanized and hot galvanized two. Galvanized pipe as a water pipe, the use of a few years later, the tube produces a lot of rust, the outflow of yellow water not only pollution sanitary ware, and mixed with non-smooth wall breeding bacteria, rust caused by high levels of heavy metals in water, serious harm to human health. More importantly, the performance of such a superior HDPE pipe, the price is not expensive.
Le tuyau de drainage en PEHD est le PVC traditionnel, les produits de remplacement des tuyaux d’eau potable. Tuyau de drainage doit être en mesure d'interdire la pression inévitable, généralement choisir la fonction de la machine est meilleure, résine PE de poids moléculaire élevé, telle que la résine HDPE, et la pression de résine LDPE poli, et le problème de connexion, ne convient pas comme matériau de tuyau de drainage.
De la fonction haute température, tuyau PE avec l'élévation de température de sa fonction pour réduire rapidement l'utilisation de la température de ± 60 ° au cours de laquelle l'utilisation générale de l'eau froide pour la principale, principalement pour le tuyau de drainage sur la route principale qui, après la maison de la sélection de tuyaux de drainage, choisira un tuyau en PPR.
PE pipe light weight, good elasticity, high impact resistance, non-toxic, cheaper unit price, low temperature performance is better, is now municipal construction, real estate, factories, water conservancy construction and other water supply and drainage pipeline must.
HDPE is a thermoplastic polyolefin produced by copolymerization of ethylene. Although HDPE was introduced in 1956, but this plastic has not yet reached a mature level. This common material is also constantly developing its new uses and markets. The thermoplastic resin. The appearance of the original HDPE was milky white, in a slight cross-section was a certain degree of translucent. PE has excellent resistance to most of the characteristics of life and industrial chemicals. Certain types of chemicals can produce chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer is not hygroscopic and has good resistance
PE can be manufactured with a wide range of different processing methods. Including extrusion such as sheet extrusion, film extrusion, pipe or profile extrusion, blow molding, injection molding and rotomoulding.
HDPE pipe is the traditional steel pipe, PVC drinking water pipe replacement products.
The roughness coefficient of the HDPE pipe is between 0.009 and 0.01, which is much smaller than the roughness coefficient of the reinforced concrete pipe (0.013-0.014). It can be seen that compared with the reinforced concrete pipe with the same diameter, In the traffic will be greater. For the municipal drainage works, through the application of HDPE off, can effectively increase the amount of emissions, thereby reducing the construction of sewage pumping stations, reducing the cost of urban sewage treatment.
HDPE pipe is a flexible pipe, in its interface is usually used in a flexible connection, it has a good sealing performance, and has a strong ability to adapt to the pipeline foundation uneven settlement, anti-leakage is very strong. Compared with the clean concrete pipes used in the traditional municipal drainage works, the HDPE pipe is flexible on the material and foundation, and it can play an effective anti-underground pollution because of its good sealing and good anti-leakage.
HDPE pipe and the traditional reinforced concrete pipe is different from the use of high-density polyethylene inert materials, so a variety of chemical have a strong corrosion resistance, so in high acid, high alkali or sewage discharge has a good effect The In the underground use, HDPE pipe can be used for more than 50 years, while the reinforced concrete pipe is susceptible to corrosion in the soil, usually in the service life of about 20 years. It can be seen, compared with the traditional reinforced concrete pipe, HDPE has a longer or useful life.