SU513866A1

SU513866A1 - Extrusion head for the production of single-layer multi-color cylindrical products from thermoplastics

Info

Publication number: SU513866A1
Application number: SU1747149A
Authority: SU
Inventors: Юрий Александрович Жданов; Петр Каленикович Допира
Original assignee: Предприятие П/Я В-8406
Priority date: 1972-02-07
Filing date: 1972-02-07
Publication date: 1976-05-15

Description

полости Б, образованные рабочими поверхност ми шайб 2 и 3 и боковыми поверхност ми ограничительных ребер 4, и кольцевой зазор а между корпусом 1 и дорнодержателем 6 с дорном 7. Выходные сечени подвод щих отверстий д расположены вблизи першин углоп раствора секторных полостей Б.cavities B formed by working surfaces of washers 2 and 3 and lateral surfaces of restrictive ribs 4, and an annular gap a between body 1 and holding-back 6 with mandrel 7. Output sections of supplying holes e are located near the opening angle of the solution of sector cavities B.

При работе экструдеров расплав подаетс по стрелке В в подвод щие отверсти д, запитывает секторные полости Б вблизи вершин углов пх раствора через выходные сечени подвод щих отверстий д, поступает в пижнюю часть б кольцевого зазора а в месте захода в него ограничительных ребер 4, соедин сь по скосам 10 в единый поток, формующийс в кольцевом зазоре а в заготовку однослойной многоцветной пленки или трубы. Регулирование И1ирины участков пленки с различным цветам производитс путем изменени угла раствора отдельных секторных полостей Б за счет установочного перемещени раздел ющих их ограничительных ребер 4 и соответствующей замены щайб 2 и 3. Поскольку ограничительные ребра примыкают к иыступу на днище дорнодержател по цилиндрическим поверхност м, перете-кание материала из одной секторной полости в другую не происходит. Получение четкой линии раздела между материалом различных цветов в изделии обеспечиваетс тем, что ограничительные ребра в месте захода их в кольцевой зазор между дорнодержателем и корпусом изогнуты по контуру их рабочих поверхностей.When extruders work, the melt is fed in the direction of arrow B into the feed holes, feeds the sector cavities B near the vertices of the nx solution angles through the output sections of the feed holes e, enters the pigeon part b of the annular gap and at the point of entry of restrictive ribs 4 into it, joining along the bevels 10 into a single stream, formed in the annular gap and into the preform a single-layer multicolor film or pipe. Adjusting the Iiryrin sections of the film with different colors is done by changing the angle of the solution of individual sector cavities B due to the installation movement of the restricting fins 4 that divide them and correspondingly replacing the shields 2 and 3. Since the limiting ribs adjoin the junction on the bottom of the doronder on cylindrical surfaces, dragging There is no dropping of material from one sector cavity to another. Obtaining a clear dividing line between the material of different colors in the product is ensured by the fact that the restrictive edges at the point of entry into the annular gap between the mandrel and the body are bent along the contour of their working surfaces.

Предлагаема головка позвол ет повысить размерную точность формуемых однослойных многоцветных пленок и труб и дает возможность регулировать соотношение цветов в издели х .The proposed head allows to increase the dimensional accuracy of formable single-layer multi-color films and pipes and makes it possible to adjust the ratio of colors in the products.

Claims

1. Extrusion head for making single-layer multicolor cylindrical

products from thermoplastics, containing a cornus with several inlets, communicating with an annular forming cavity, formed by a housing and a mandrel installed therein with a mandrel and divided by limiting ribs into separate forming sections, characterized in that, in order to improve the dimensional accuracy of products, the head is equipped with installed between the bottoms of the case and

Dorolder replaceable washers, forming with sector limbs located between them limiting ribs, connected to the inlet holes of the head near the vertices of the corners of their solution.

2. The head according to claim 1, characterized in that, in order to adjust the width of the sections of products with different colors, interchangeable shields and ribs are made of rows radially

openings, co-clad with each other and with a series of holes, made in the corus and doroganalye bottoms.

3.Head on PP. 1 and 2, characterized in that the bottom of the dock holder is made with

protrusion in contact with restrictive ribs on the cilidric surfaces.

4.Header on PP. 1-3, characterized in that the limiting ribs in their place

approach into the annular gap is made curved along the contour of the working surfaces of the housing and the holders.