SU1597273A1 - Arrangement for granulating polymeric materials - Google Patents

Abstract

The invention relates to devices for granulating polymeric materials, rubbers and rubber compounds. The purpose of the invention is to improve the performance of the device and the quality of the granules by stabilizing their size. For this, the device comprises a screw extruder, a cutting element and a profiling head. The head is made in the form of external and internal die plates with dies. One of the plates has a conical protrusion. The spinnerets are located on logarithmic spirals rotating in the direction of rotation of the auger with a density decreasing from the center of the plate to the periphery. In the dies installed inserts, made each of two parts. Parts of the liner are placed in spunbond plates. Three conical channels are made in one part, and one conical channel in the other. The ratio of the total cross-sectional areas of the channels of the liners of the outer and inner plates is 2: 1. During operation, the productivity is increased by reducing the resistance of the die. The quality of the material is ensured by preventing the granules from sticking together, preventing mechanical destruction. 4 il.

Description

The density of the placement of the holes 5 decreases from the center to the lane through beam 7.

For example, the number of spirals is eight. Each spiral intersects concentric circles with the center in the center of the slab at eight points through 45, and all the rays - at an angle of 80.

The arrangement of the holes 5 along a logarithmic spiral 6 satisfies the condition of material consumption during its rotational-translational motion over the entire cross section of the nozzle plate, so that the pressure at each point will be constant, which prevents clogging of the holes 5. The number of holes 5 is determined by the number of spirals and the angle between the helix and the beam, and corresponds to the maximum possible for a given cross-sectional area of the spinneret, and consequently, the maximum possible performance.

In the holes 5 of the inner 3 and of the outer 4 plates, grooves 8 are made into which inserts are installed. Each liner consists of two parts; inner 9 and outer 10, the first part is intended for installation in the inner 3 spun-hole plate, the second - in outer A. The inner part 9 of the liner contains three channels 1I, made in the form of truncated cones with an apex angle of 5-8 °, small bases which are displaced with respect to large bases at an angle of 20-25 °. The outer part 10 of the contribution 1 contains one channel 12, also made in the form of a truncated cone with an angle at the apex of 30-40 and with a displacement of the small base relatively larger by an angle of 15

The inserts are installed in the holes 5 of the draw plates 4 and 3 with the openings of the channels 11 and 12 in the direction of unrolling the helix during the rotation of the screw 2. The channel 12 of the outer part 10 of the insert combines the flow of three channels 11 of the inner part 9 on the adysh. The ratio of the total cross-sectional areas of the channels 10 and the inner 9 part is the contribution, i.e. the flow through the inner spin plate is twice the flow through the outer spin plate, thereby ensuring equal pressure at the outlet of the channels 12.

In the center of the inner 3 spunbond plate is a protrusion 13, having

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cone shape and serving to prevent polymer retention.

The device works as follows.

The material to be processed is homogenized and transported by the screw 2 to the main head, dissected by a conical protrusion 13 and evenly distributed along the surface of the inner 3 Spun-plate, without forming a stagnant zone in the center. Then the material enters the channels 11 of the inner part 9 of the insertion plate of the nozzle plate 3. Due to the fact that the material is informed by screw 2 rotational-translational movement, and channels I1 and 12 are located at the intersection of the logarithmic spiral that develops during the rotation of the screw 2, the resistance of channels 11 and 12 movement of the material will be minimal. This increases device performance.

The flow of material from the channels 11 enters the channels 12 of the outer part 10 of the die plate .4. Due to the implementation of the channels 11 and 12 of the contribution of the conical taper, the coefficient of friction of the material against the walls of the holes is reduced, shear stresses and mechanical destruction of the material are reduced. In addition, the resistance to movement of the material decreases (as compared to cylindrical channels), and consequently, the productivity of the device increases under the same operating conditions.

The displacement of the smaller bases of the truncated cones in the direction of the helix deployment prevents the material from accumulating in the prefilter area during translational-rotational motion of the material.

Thus, the process material passes the channels 11 of the inner spin plate 3 and the channels 12 of the outer spin plate 4, exits from them and is cut with a cutting device (not shown) into pellets.

Claims (1)

Equal pressure at the outlet of the profiling channels of the outer spun-plate 4, regardless of their location from the center of the plate, makes it possible to obtain granules of a stable size. Invention Formula A device for granulating polymeric materials containing a screw extruder, a rozhush 1st tool and a profil head made In the form of external and internal spin plates with holes and a conical protrusion, characterized in that, in order to improve device performance and pellet quality by stabilizing their sizes, the openings of both spin plates are coaxially along the logarithmic spirals turning from the center of the plates. center to the periphery of the density of the holes, and the die plates are provided with contributions mounted in the holes of the plates and consisting of each of the two parts, with one part of the insert containing three conical channels and mounted in the inner spunbond plate, while the other part of the insert has one conic bore and mounted on the outer spunbond plate, the ratio of the total cross-sectional areas of the channels of the liners of the outer and inner die plates is 2: 1. Polymer FIG. g 73 Editor G. Gerber Compiled by N. Ruhl Maid Tehred M. Didyk Proofreader M. Pojo Order 3026 Circulation 543 VNSHSHI of the State Committee for Inventions and Discoveries at the State Committee on Scientific and Technical Information С (;; СР 113035, Moscow, Ж-33, 4/5 Raushsk Nab. Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 f.J Schig. Subscription