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熱門關鍵詞：聚丙烯PP管塑料通風管 PP風管 PP管材 PP方管 PP阻燃管 PP通風管 PP管 PP成型管

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PVC塑料通風管出现缩痕的原因

作者：本藍環保編輯：本藍環保來源：未知 2021-09-24 16:46

PVC塑料通風管出现缩痕的原因

PVC塑料通風管表面的收缩痕迹会直接影响PVC型材的外观，甚至影响清角的整齐度，因此给高质量水平的PVC塑料通風管道留下遗憾。那么水管为什么会出现缩痕这一种情况呢，下面为***家列出几个原因出来。

1、收縮痕與真空度。

同一套模具在真空度小或是模具真空孔被堵時，容易出現收縮痕。經過仔細的檢查之後，真空度小或是幹定型模真空孔被堵時，PVC型材的外表面不能很***地貼緊定型膜面，所以冷卻效果減少，在幹定型模中的冷卻不完全，進而會造成冷卻收縮的痕迹。

2、收縮痕迹與內筋厚度。

VC排水管在实际的生产中，发现内筋与外壁相比过厚，容易造成收缩痕迹，内筋超过外壁厚，则收缩痕迹更明显，相反的内筋越薄越不容易产生收缩痕迹。确切的说，内筋的厚度小于外壁厚度的2/3时，一般不会产生收缩痕迹。根据相关的分析认为此现象由于冷却收缩之后所造成的。在PVC塑料通風管道定制冷却之后，内筋与外壁交叉位置与其他壁厚位置相比较发现冷却散热量***且温度高。所以存在后冷却收缩，内筋越厚，所储存的热量越***，后收缩越严重。

3、收縮痕與模具流道。

內筋單***流道不易産生收縮痕，T型流道結合位置容易産生收縮痕，其生産的程度與T型兩交接流道的寬度比有關，比值爲T型橫流道寬度比豎流道寬度。比值越***，越不容易産生收縮痕迹。

上一篇：實驗室阻燃pps風管彎頭加工及原材料複合成型 下一篇：导致PVC塑料通風管发黄的主要因素有哪些

相關閱讀：

實驗室阻燃塑料風管：安全與效率的完美結合

塑料通風管道的基本功能

塑料通風管道：建筑中的无声英雄

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The same principle may be extended in a different direction if we substitute for knowledge, in its narrower significance, the more general conception of associated feeling. We shall then see that belief, habit, emotion, and instinct are only136 different stages of the same process—the process by which experience is organised and made subservient to vital activity. The simplest reflex and the highest intellectual conviction are alike based on sensori-motor mechanism, and, so far, differ only through the relative complexity and instability of the nervous connexions involved. Knowledge is life in the making, and when it fails to control practice fails only by coming into conflict with passion—that is to say, with the consolidated results of an earlier experience. Physiology offers another analogy to the Socratic method which must not be overlooked. Socrates recommended the formation of definite conceptions because, among other advantages, they facilitated the diffusion of useful knowledge. So, also, the organised associations of feelings are not only serviceable to individuals, but may be transmitted to offspring with a regularity proportioned to their definiteness. How naturally these deductions follow from the doctrine under consideration, is evident from their having been, to a certain extent, already drawn by Plato. His plan for the systematic education of feeling under scientific supervision answers to the first; his plan for breeding an improved race of citizens by placing marriage under State control answers to the second. Yet it is doubtful whether Plato’s predecessor would have sanctioned any scheme tending to substitute an external compulsion, whether felt or not, for freedom and individual initiative, and a blind instinct for the self-consciousness which can give an account of its procedure at every step. He would bring us back from social physics and physiology to psychology, and from psychology to dialectic philosophy. CAWNPORE From a quite small garden close to the palace a bronze gate with three medallions of lilies in high relief, of marvellous workmanship, opens on the Pearl Mosque, exquisitely white, at the end of its forecourt of immaculate pavement enclosed by a marble balustrade. Three polished and shining domes are supported by columns of snow made of a hard white marble, scarcely broken by [Pg 218]ornament, and carrying a roof hollowed into three vaults. The rings are still to be seen on the marble walls outside, to which, when the great Mogul came to prayer, curtains were attached made of gold net and spangled with diamonds and pearls. His library, that evening, made Sandy think of a “mass meeting of creditors or stockholders who have been tricked.” Cairness went on, back to the barracks, and sitting at the troop clerk's desk, made a memory sketch of her. It did not by any means satisfy him, but he kept it nevertheless. He hesitated still. "I don't doubt you," he told her. "Cairness never was a squaw-man," corrected Crook. But the cottage was shut. With its red-rotting roof between two tall chimneys it looked exactly like a rabbit's head between its ears; the windows were blind, though it was past seven o'clock, and though Reuben knocked at the door loudly, there was no one to be seen. He prowled once or twice round the house, fumbling handles and window-latches, but there was no way of getting in. He listened, but he could not hear a sound. He pictured Rose and Handshut in each other's arms, laughing at him in his wretchedness and their bliss—and all the time he wanted the woman's blood more than the man's. "Yes; I don't want him to think we're set on getting away—but, by gum, Bill! we are." "I think she said her name was Holgrave," replied the lady in a cold tone. "But indeed, my lord baron, you seem to be wondrously well acquainted with the faces and the handywork of your vassals' wives!" "But, my liege," continued Oakley, still kneeling, "there is one confined in this fortress for whom I would solicit freedom." HoME 性感乱仑黄色小说ENTER NUMBET 008www.huanghung.com.cn
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