Analysis of water supply pipe equipment PE water pipe elonga

Release time：2018-10-22 13:28

The elongation at break index of PE water supply pipe is a very important index. For the manufacturer who uses pure PE resin and black master batch to produce water supply pipe, the factors leading to the good or bad of the index are as follows: the choice of new material, black master batch, equipment condition, mixing mode, process control and personnel operation, sampling preparation and test. Through repeated tests and comparative analysis of elongation at break, it is found that the most critical factor is the choice of new material and black masterbatch.
1. Introduction
Despite the use of fresh materials to produce water supply pipes, the problem of elongation at break has been a problem plaguing our company's early production of water pipes. Since the production of grade PE 100 water pipes, its instability has existed for a long time. With the constant adjustment and use of domestic PE 100 grade raw materials, with the continuous increase of water pipe production, the problem of unqualified elongation at break is more obvious. The unqualified phenomena are mainly as follows: 1. Sampling elongation at break at different locations of the same pipe, the value of the results vary greatly, from 700% to 800% for large and from 100% for small. 2. The results of the overall elongation at break are not high, swaying between 300% and 400%, resulting in unqualified.
2. Analysis of process control and personnel operation for master of water supply equipment manufacturers
Analysis: This problem needs to be paid attention to, the adjustment of process can not be too arbitrary, especially the processing temperature must be adjusted within a certain range. Combined with the processing characteristics of plastics, too low or too high processing temperature will affect the performance of pipes.
3, sampling method, test equipment and test personnel operation analysis
(1) sampling mode: sampling during start-up and normal production after 1 hours.
Analysis: There may be some effects, especially in the case of raw material formulation changes, reboot production sampling, due to changes in material properties and junction reasons, just started sampling is not enough to represent the performance of subsequent formulation pipes.
Through the comparative analysis of the above data, in most cases, as long as the raw material is stable, the tensile change of the normal production sample of the startup sample is little. Preliminary analysis shows that this problem should not be the main factor leading to large fluctuation of elongation at break of PE100 water supply pipe.
(2) As long as the testing equipment and personnel are basically unchanged, it should not be the main factor leading to the fluctuation of elongation at break of PE100 water supply pipe.

4. Self analysis of production equipment (including extrusion, molding, mixing equipment).
(1) Extrusion speed: On the basis of other requirements in line with the requirements, the adjustment of production speed is basically the same ratio, the extrusion speed and traction speed match, plastic tensile normal.
(2) Mandrel Size: When thin pipes are produced with mandrels for thick pipes, the extrusion draw ratio of plastics is relatively larger. Theoretically, it will have a slight impact on the numerical value, although the impact is small, it should also be controlled, especially for switching SDR26 pipe production.
Generally speaking, the impact is limited, because after all, the frequency of switch specifications is not very many, and combined with the test data of the last three years, it can be found that the instability of output rate mostly occurs in the specifications of non-switch mandrels, so preliminary judgment should not be the most important factor leading to the large fluctuation of PE100 water supply pipe elongation at break.
5. Conclusion
(1) For pipes produced with new material and black masterbatch, the selection of new material should be the most important factor leading to large fluctuation and instability of elongation at break, followed by the selection of black masterbatch.
(2) For the selection of new materials, we should know the material properties, especially the breaking elongation index of the manufacturer; for the selection of black masterbatch, we should control the melting flow rate and dispersion index, so that it can be uniformly dispersed in the new materials.
(6) stirring unevenness has an effect on tensile strength. It is necessary to ensure consistency and continuous attention.