SU659398A1 - Method of making large articles from polyethylene - Google Patents
Method of making large articles from polyethyleneInfo
- Publication number
- SU659398A1 SU659398A1 SU752304900A SU2304900A SU659398A1 SU 659398 A1 SU659398 A1 SU 659398A1 SU 752304900 A SU752304900 A SU 752304900A SU 2304900 A SU2304900 A SU 2304900A SU 659398 A1 SU659398 A1 SU 659398A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- polyethylene
- making large
- large articles
- products
- cooling
- Prior art date
Links
Description
1one
Изобретение относитс к области переработки пластических масс и может быть использовано при переработке полиэтилена в крупногабаритные издели диаметром 250- 1200 мм и высотой, достигающей трех диаметров .The invention relates to the field of plastics processing and can be used in the processing of polyethylene into large-sized products with a diameter of 250-1200 mm and a height reaching three diameters.
Известен способ лить толстостенных изделий , по которому после заполнени формы, с целью улучшени качества издели , в процессе охлаждени отливки обеспечивают необходимое давление во всем объеме расплава до полного его затвердени 1.There is a known method for casting thick-walled products, according to which, after filling the mold, in order to improve the quality of the product, in the process of cooling the casting, the required pressure is provided in the entire volume of the melt until it is completely solidified 1.
Недостатком такого способа вл етс использование давлени , что весьма затруднено при изготовлении крупногабаритных заготовок диаметром 500-1200 мм так как при этом увеличиваетс длительность охлаждени .The disadvantage of this method is the use of pressure, which is very difficult in the manufacture of large-sized workpieces with a diameter of 500-1200 mm as this increases the cooling time.
Цель изобретени заключаетс в улучшении качества изделий.The purpose of the invention is to improve the quality of products.
Указанна цель достигаетс тем, что в способе изготовлени крупногабаритных изделий из полиэтилена путем плавлени гранулированного полиэтилена в вакууме и последуюшего охлаждени , плавление гранулированного полиэтилена осуществл ют в направлении снизу вверх при 10 -10 ммThis goal is achieved by the fact that in the method of manufacturing large-sized polyethylene products by melting granulated polyethylene in vacuum and subsequent cooling, the melting of granulated polyethylene is carried out in the upward direction at 10 -10 mm
рт.ст., 140-200°С с перепадом температур 10-15°С по высоте на каждые 100 мм и охлаждают снизу вверх до 20-80°С с перепадом температур 5-10°С по высоте на каждые 100 мм со скоростью, определ емой поHg, 140-200 ° C with a temperature difference of 10-15 ° C in height for every 100 mm and cooled from the bottom up to 20-80 ° C with a temperature difference of 5-10 ° C in height for every 100 mm with a speed determined by
формулеformula
V 4,85-0,0038d, где V - скорость охлаждени , °С/ч; d - диаметр изделий, мм. Пример. Готов т заготовки диаметром 500 мм и высотой 900 мм. Нагрев и плавление полиэтилена в вакууме 5 мм рт.ст. провод т в течение 36 ч при температуре на стенках формы 170-190°С. Перепад обеспечивают регулированием температуры по зонам изменением напр жени на обогревател х . Аналогичным образом поддерживают перепад температур при охлаждении. Согласно предложенной формуле скорость охлаждени дл данной заготовки составл ет 2,95 °С/ч. Полученна заготовка не содержит в объеме усадочных раковин, воздущных включений, следов окислени , значительных механических напр жений.V 4.85-0.0038d, where V is the cooling rate, ° C / h; d - diameter of products, mm. Example. Preparations are made with a diameter of 500 mm and a height of 900 mm. Heating and melting of polyethylene in a vacuum of 5 mm Hg. carried out for 36 hours at a temperature on the walls of the form 170-190 ° C. The differential is provided by adjusting the temperature over the zones by varying the voltage across the heaters. Similarly, the temperature differential is maintained during cooling. According to the proposed formula, the cooling rate for this preform is 2.95 ° C / h. The resulting billet does not contain in the volume of shrink holes, air inclusions, traces of oxidation, significant mechanical stresses.
Использование предлагаемого способа изготовлени крупногабаритных изделий позвол ет получить толстостенную изол циюUsing the proposed method for manufacturing large-sized products allows to obtain thick-walled insulation.
дл высоковольтных установок, используемых дл физических исследований.for high voltage installations used for physical research.
Высокое качество материала обеспечивает надежную работу изол ции в р де изготовленных ускорителей и квантовых генераторов (оптических).The high quality of the material ensures reliable insulation performance in a number of manufactured accelerators and quantum oscillators (optical).
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU752304900A SU659398A1 (en) | 1975-12-19 | 1975-12-19 | Method of making large articles from polyethylene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU752304900A SU659398A1 (en) | 1975-12-19 | 1975-12-19 | Method of making large articles from polyethylene |
Publications (1)
Publication Number | Publication Date |
---|---|
SU659398A1 true SU659398A1 (en) | 1979-04-30 |
Family
ID=20642463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU752304900A SU659398A1 (en) | 1975-12-19 | 1975-12-19 | Method of making large articles from polyethylene |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU659398A1 (en) |
-
1975
- 1975-12-19 SU SU752304900A patent/SU659398A1/en active
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