SU870171A1

SU870171A1 - Core holder of polymer extrusion heads

Info

Publication number: SU870171A1
Application number: SU772459154A
Authority: SU
Inventors: Рихтер Вольфганг; Трагсдорф Бодо
Original assignee: Феб Пласт Унд Эластферарбайтунгсмашинен Комбинат Карл-Маркс-Штадт (Инопредприятие)
Priority date: 1976-03-30
Filing date: 1977-03-11
Publication date: 1981-10-07
Also published as: GB1573940A; DD126550A1; DE2703922A1

Description

Изобретение относится к оборудова· нию для переработки пластмасс.The invention relates to equipment for processing plastics.

Известно устройство для переработки пластмасс, содержащее корпус, внутри которого размещен ^дорнодержатель с дорном, образующий с корпусом кольцевой формующий канал £1].A device for processing plastics is known, comprising a housing, inside of which there is a support holder with a mandrel, forming an annular forming channel with the housing £ 1].

Недостатки устройства - невысокое качество смещения расплава и низкое качество получаемых изделий.The disadvantages of the device are the low quality of the displacement of the melt and the low quality of the resulting products.

Наиболее близким к предлагаемому ¹является дорнодержатель экструзионных головок для полимеров, содержащий соединенные с дорном и размещенные один над другим кольцевые элементы с каналами для расплава полимера f2j.Closest to the proposed ¹ is a holder for extrusion heads for polymers containing connected to the mandrel and placed one above the other ring elements with channels for polymer melt f2j.

В этом случае также невысоко качество смешения расплава.In this case, the melt mixing quality is also low.

Цель изобретения - улучшение свойств изделий за счет повышения эф- . фективности процесса смешения расплава.The purpose of the invention is to improve the properties of products by increasing the eff. the effectiveness of the process of mixing the melt.

Это достигается тем, что дорнодержатель снабжен размещенными над каждым кольцевым элементом промежуточными кольцами, при этом каналы в коль-; цевых элементах, смещенных один относительно другого по окружности, размещены группами, выходы каналов каждой из которых расположены На линии, перпендикулярной линии размещения их входов, причем выходы каналов, крайних на входе, расположены между выходами каналов, размещенных на входе внутри, а промежуточные кольца выполнены с выемками для поворота расплава, количество которых равно числу групп каналов.This is achieved by the fact that the holder is provided with intermediate rings located above each annular element, while the channels in the ring; the central elements, displaced relative to each other in a circle, are placed in groups, the outputs of the channels of each of which are located on a line perpendicular to the line of placement of their inputs, the outputs of the channels extreme at the input located between the outputs of the channels located at the input inside, and the intermediate rings are made with recesses for turning the melt, the number of which is equal to the number of channel groups.

При этом каналы на входе кольцевого элемента расположены по окружности, а каналы на выходе расположены радиально; выемки в промежуточных кольцах выполнены с образованием на верхнем конце кольцевого канала,- в промежуточных кольцах расположены аксиальные каналы для подвода и отвода воздуха, которые соединены радиальными подводящими и отводящими трубо— проводами, выполненными в кольцевых элементах между группами проходящих каналов.Moreover, the channels at the entrance of the annular element are located around the circumference, and the channels at the exit are located radially; the recesses in the intermediate rings are formed with the formation on the upper end of the annular channel, - in the intermediate rings are axial channels for supplying and removing air, which are connected by radial inlet and outlet pipes — wires made in annular elements between groups of passing channels.

На фиг. 1 изображена экструзионная головка, общий вид; на фиг. 2 разрез А-А фиг. 1; на фиг, 3 - разрез Б-Б фиг. 1; на фиг. 4 - схематическое изображение зон поворота расплава. ,In FIG. 1 shows an extrusion head, general view; in FIG. 2 a section A-A of FIG. one; FIG. 3 is a section BB of FIG. one; in FIG. 4 is a schematic illustration of melt rotation zones. ,

Экструзионная головка состоит из нижней части 1, кольцевых элементов 2, 3, промежуточных колец 4, 5, мундштука 6 и дорна 7. Кольцевые элементы 2, 3 и промежуточные кольца 4, 5 жестко крепятся винтами 8,9 к нижней части 1 головки и к мундштуку 6. _Дорн 7 соединен винтами с верхним_ промежуточным кольцом 5 и кольцевым элементом 3. Можно также непосредственно прикреплять дорн 7 к промежуточному кольцу 5. Подвод и отвод охлаждающего воздуха осуществляется через выбранные в кольцевых элементах 2, 3 каналы 10, 11 и через осевые каналы 12, 13. Поворот зон перемешивания в пределах кольцевых элементов 2, 3 на 90° дает возможность расположения соответствующих подводящих и отводящих каналов 10, II между отдельными зонами 14 перемешивания. Каналы 15, 15^# , I5^W, 15^г образуют одну зону 14 перемешивания. Количество каналов, образующих одну зону перемешивания, и количество зон перемешивания зависят от желаемой степени перемешивания. Зоны 14 перемешивания находятся в начале кольцевых элементов 2, 3 на кругообразной траектории. Каналь! 15, 15’ , 15^м, 15% образующие зону 14 перемешивания, выполнены так в кольцевых элементах, что они занимают на верхнем конце кольцевых элементов 2, 3 повернутые на 90° положения (см. фиг. 2). Расположение каналов 15, 15^z, 15% 15^,,? внутри одной зоны перемешивания следующее: крайние каналы 15, 15^nr проходят во внутрь, а внутренние каналы 15% выходят на край (см. фиг.2 и 3) .The extrusion head consists of the lower part 1, the ring elements 2, 3, the intermediate rings 4, 5, the mouthpiece 6 and the mandrel 7. The ring elements 2, 3 and the intermediate rings 4, 5 are rigidly fixed with screws 8.9 to the lower part 1 of the head and to mouthpiece 6. _Dorn 7 is connected by screws to the upper_ intermediate ring 5 and the annular element 3. You can also directly attach the mandrel 7 to the intermediate ring 5. The supply and exhaust of cooling air is carried out through the channels 10, 11 selected in the ring elements 2, 3 and through the axial channels 12, 13. Rotation of the mixing zones within the ring elements 2, 3 by 90 °, it is possible to arrange the corresponding inlet and outlet channels 10, II between the individual mixing zones 14. Channels 15, 15 ^# , I5 ^W , 15 ^g form one mixing zone 14. The number of channels forming one mixing zone and the number of mixing zones depend on the desired degree of mixing. The mixing zones 14 are located at the beginning of the annular elements 2, 3 on a circular path. The channel! 15, 15 ', 15 ^m , 15% forming the mixing zone 14 are made in the ring elements so that they occupy 90 ° positions at the upper end of the ring elements 2, 3 (see Fig. 2). Channel arrangement 15, 15 ^z , 15% 15 ^,,? inside one mixing zone the following: the extreme channels 15, 15 ^nr extend inward, and the internal channels 15% go to the edge (see FIGS. 2 and 3).

Непосредственно примыкающие к кольцевым элементам 2, 3 промежуточные кольца 4, 5 имеют зоны поворота расплава 16, которые возвращают расплав на кругообразную траекторию. Каждой зоне перемешивания соответствует зона 16 поворота расплава. Каждая зона'16 поворота расплава состоит из щелеобразной основной поверх870171 4 ности 17, ширина щели которой не менее диаметра каналов 15. Боковые поверхности 18-21 выполнены так, что верхние поверхности 22 всех зон 16 5 поворота расплава образуют кольцевую щель.Directly adjacent to the annular elements 2, 3, the intermediate rings 4, 5 have melt rotation zones 16 that return the melt to a circular path. Each mixing zone corresponds to a zone 16 of the rotation of the melt. Each zone поворота 16 of the melt rotation consists of a slit-like main surface 170171 4, with a slot width of not less than the diameter of the channels 15. The side surfaces 18-21 are made so that the upper surfaces 22 of all the zones 16 5 of the melt rotation form an annular gap.

Зоны 16 поворота расплава выбираются в промежуточных кольцах 4, 5. По технологическим причинам промежуЮ точные кольца 4, 5 преимущественно изготовляются, из двух отдельных колец. Для повышения эффекта смешивания кольцевые элементы 2, 3 смещены один относительно другого. Согласно 15 конструктивного примера, верхний кольцевой элемент 3 повернут относительно нижнего кольцевого элемента 2 на два канала 15, 15%The melt rotation zones 16 are selected in the intermediate rings 4, 5. For technological reasons, the intermediate rings 4, 5 are predominantly made from two separate rings. To increase the mixing effect, the annular elements 2, 3 are offset from one another. According to 15 constructive examples, the upper annular element 3 is rotated relative to the lower annular element 2 into two channels 15, 15%

Устройство работает следующим об₂₀ разом.The device works as follows about ₂₀ times.

Центрально подводимый расплав рассекается в нижней части 1 головки в радиальном направлении и течет в расположенные на кругообразной траекто₂₅ рии каналы 15 кольцевого элемента 2.The centrally supplied melt is dissected in the lower part 1 of the head in the radial direction and flows into the channels 15 of the annular element 2 located on a circular path ₂₅ .

Поворот зон 14 перемешивания на 90° и течение крайних потоков во внутрь и .внутренних на край обуславливают перегруппировку граничных слоев. Образующие зону 14 перемешивания потоки из каналов 15, 15, 15 , 15 подлежат в зонах 16 поворота расплава интенсивному перемешиванию и возвращаются к кругообразной траектории. Зоны поворота расплава выполнены та^3S ким образом, что исключается возможность образования застойных зон. Расплав, находящийся в кольцевом’зазоре, образованном зонами.16 поворота расплава, аналогично протекает через ⁴⁰ кольцевой элемент 3 и промежуточное кольцо 5. Благодаря смещенному расположению кольцевого элемента 3, достигается эффект перемешивания между самими зонами 14 перемешивания,The rotation of the mixing zones 14 by 90 ° and the flow of the extreme flows inward and internal to the edge cause a rearrangement of the boundary layers. The streams forming the mixing zone 14 from the channels 15, 15, 15, 15 are subject to intensive mixing in the zones 16 of the melt rotation and return to a circular trajectory. The melt rotation zones are made in such a ^3S manner that the formation of stagnant zones is excluded. The melt located in the annular gap formed by the zones 16 of the rotation of the melt similarly flows through the ⁴⁰ ring element 3 and the intermediate ring 5. Due to the offset arrangement of the ring element 3, the mixing effect between the mixing zones 14 themselves is achieved.

За счет качественного смешения расплава улучшаются свойства получаемых изделий.Due to high-quality melt mixing, the properties of the resulting products are improved.

Claims

(54) CUTTER EXTRUSION HEADS The invention relates to equipment for processing plastics. A device for processing plastics is known, which comprises a housing, inside which there is a holder with a mandrel, forming a forming channel 1 with the ring ring. The disadvantages of the device are the low quality of the melt displacement and the poor quality of the products obtained. Closest to the present invention is the die holder of the extrusion heads for polymers, which contain annular elements connected to the mandrel and placed one above the other with melt channels for the polymer 21. In this case also, the quality of the melt mixing is not high. The purpose of the invention is to improve the properties of the products by increasing the efficiency of the melt mixing process. This is achieved in that the holder is provided with intermediate rings arranged above for the POLYMERS each ring element, wherein the channels in the ring elements displaced one another relative to the other around the circumference are arranged in groups, the outputs of the channels each of which are tia lines, perpendicular to the line of their inputs, moreover, the outlets of the channels at the inlet are located between the outlets of the channels located inside the inlet, and the intermediate rings are made with recesses for turning the melt, but the number of groups of channels. In this case, the channels at the inlet of the ring element are located circumferentially, and the channels at the exit are located radially; the notches in the intermediate rings are made to form an annular channel at the upper end; axial channels are located in the intermediate rings for supplying and discharging air, which are connected by radial inlet and outlet pipes, which are made in the annular elements between the groups of the inner channels. FIG. 1 shows an extrusion head, a general view; in fig. 2, section A-A of FIG. one; FIG. 3 is a cross-section of BB FIG. one; in fig. And - the schematic image of zones of rotation of melt. The extrusion head consists of the bottom part 1, ring elements 2, 3, intermediate rings A, 5, mouthpiece 6 and mandrel 7. Ring elements 2, 3. and intermediate rings 4, 5 are rigidly fixed with screws 8, 9 to the bottom part 1 heads and to the mouthpiece 6. Jl, opH 7 is screwed to the upper intermediate ring 5 and the ring element 3. It is also possible to directly attach the mandrel 7 to the intermediate ring 5. The cooling air is fed in and out through the elements selected in the ring elements 2, 3 channels 10, And through axial channels 12, 13. Rotate the zones Ani within the annular elements 2, 3 by 90 enables positioning of the respective inlet and exhausts boiling channels 10, 11 between the separate zones 14 -mixing. The channels 15, 15, IS, 15 form one mixing zone 14. The number of channels forming one mixing zone and the number of mixing zones depend on the desired degree of mixing. The mixing zones 14 are at the beginning of the ring elements 2, 3 on a circular trajectory. The channels 15, 15, 15, 15, which form the mixing zone 14, are made in ring elements in such a way that they occupy the positions rotated by 90 ° in the upper end of the ring elements 2, 3 (see Fig. 2). The arrangement of the channels 15, 15, 15, 15 inside one mixing zone is as follows: the extreme channels 15 pass inwards, and the internal channels 15 exit to the edge (see Figures 2 and 3). Immediately adjacent to the annular elements 2, 3 intermediate rings 4, 5 have a zone of rotation of the melt 16, which return the melt on a circular trajectory. Calsda mixing zone corresponds to the zone 16 of the rotation of the melt. Each zone 16 of the melt rotation consists of a slit-like base surface 17, the slit width of which is not less than the diameter of the channels 15. The side surfaces 18-21 are made so that the upper surfaces 22 of all zones 16 of the melt rotation form an annular slit. The melt turning zones 16 are selected in the intermediate rings 4, 5. For technological reasons, the intermediate rings 4, 5 are preferably made up of two separate layers. To increase the mixing effect, the annular elements 2, 3 are displaced relative to each other. According to a constructive example, the upper, annular element 3 is rotated relative to the lower annular element 2 to two channels 15, 15. The device operates as follows. The centrally supplied melt is dissected in the lower part 1 of the head in the radial direction and flows into the channels 15 of the annular element 2 located on a circular trajectory. The rotation of the mixing zones 14 by 90 and the outward flow inside and inside the edges cause the rearrangement of the boundary layers. The streams forming the mixing zone 14 from the channels 15, 15, 15, 15 are subject to intensive mixing in the melt rotation zones 16 and return to a circular trajectory. The melt rotation zones are designed in such a way that the possibility of stagnation zones is excluded. The melt located in the annulus formed by the zones of rotation of the melt flows similarly through the annular element 3 and the intermediate ring 5. Due to the displaced arrangement of the annular element 3, the effect of mixing between the mixing zones 14 is achieved. Due to the high-quality melt mixing, the properties of the obtained products are improved. Claim 1. Dorn holder of extrusion heads for polymers, containing annular elements connected to the mandrel and placed one above the other with melt channels of the polymer, characterized in that, in order to improve the properties of the products,

five

increase the efficiency of the melt mixing process; the retainer is provided with intermediate rings and rings located above each ring element; inputs, the outputs of the channels at the entrance, located between the outputs of the channels located at the entrance inside, and the intermediate rings are made with grooves for turning the melt, if ETS equal to the number of channel groups.

2. The dorn holder according to claim 1, wherein, the channels at the inlet of the annular element are located circumferentially, and the channels at the exit are located radially.

716

3. Doroyederzhatel on PP. 1, and 2, characterized in that the notches in the intermediate rings are formed to form an annular channel at the upper end.

4. Holder of the popp. 1H2, which differs in that axial channels are located in the intermediate rings for supplying and discharging air. spirit, which are connected to the radial inlet and outlet pipelines, which are made in the annular elements between the groups of passing channels.

Sources of information taken into account in the examination

1. Author's certificate of the USSR 466119, cl. B 29 F 3/04, 1973,

2. USSR author's certificate in accordance with W 2343710, cl. B 29 F 3/04 1975 (prototype).