CN216373283U

CN216373283U - Polymer blowing extrusion tooling

Info

Publication number: CN216373283U
Application number: CN202122536061.8U
Authority: CN
Inventors: 翁伟明; 吴维果; 刘志刚; 李国方
Original assignee: Jiangsu Jinzhihong New Material Co ltd
Current assignee: Jiangsu Jinzhihong New Material Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-04-26
Anticipated expiration: 2031-10-21

Abstract

The utility model discloses a polymer discharging extrusion die, which comprises: the extrusion die comprises a feeding port, an extrusion die main body and a heat conduction oil jacket; the outer layer of the extrusion die main body is provided with a heat conduction oil jacket, the extrusion die main body is connected with an external extrusion device outlet through a feeding port, and heat conduction oil can be led in the heat conduction oil jacket. The two sides of the main runner of the mold are provided with branch runners, and the polymer material can flow out through the slender and flat mouth mold through the distribution runners. Compared with the common extrusion die, the die disclosed by the utility model is heated by adopting heat conduction oil, so that the stability of the heat-sensitive material is improved, and the extruded material is divided into six by the unique structural design, so that the serious warping deformation of some materials with larger cooling deformation after extrusion can be avoided, and the smoothness of the material production process is improved. The mold is characterized in that a main runner plug is arranged at the center of the mold, and the main runner plug can be detached to be used for connecting a cleaning device or used as a hand hole to clean residual materials in a runner, so that the cleaning is facilitated.

Description

Polymer blowing extrusion tooling

Technical Field

The utility model relates to a polymer discharging extrusion die, in particular to a die for extruding crystalline and heat-sensitive polymers with low viscosity or low melt strength.

Background

After the polymer has been synthesized, it is often necessary to be cooled, shaped and chopped into small particles in as short a time as possible in various ways to ensure quality uniformity and to facilitate storage and transportation and further processing. Extrusion molding is a common method for molding polymer materials. In the field of polymer synthesis, it is common to draw the polymer into strands through a circular orifice die and then to water-cool or air-pelletize the strands. However, the extrusion method has relatively small extrusion output, and for some materials with low molecular weight and high crystallinity, because of its low molecular weight, the corresponding low viscosity (poor melt strength), the stable ribbing through a round hole die was not possible, therefore, it is necessary to develop new large-throughput extrusion dies and to adapt the cooling and crushing modes of the low melt strength polymer (e.g., steel belt cooling, such as laying down a low viscosity polymer on a circulating rotating steel belt, and then feeding the polymer to a crusher for crushing), however, for some crystalline polymers, if the crystalline polymers are extruded through a die head and laid on a steel belt to form a continuous sheet, the sheet is very easy to generate serious buckling deformation along with the subsequent cooling crystallization process, so that the sheet cannot be accurately conveyed into a feeding port of a crusher, and the continuity of the whole polymer production line is influenced. Common extrusion dies are heated by electricity, but the control precision of the electricity heating is poor, the dies are easily heated unevenly, and the extrusion dies are particularly unsuitable for certain heat-sensitive materials. In addition, common extrusion tooling is because do not have design maintenance and the special hole of clearance, in equipment intermittent type nature operation in-process, is difficult to carry out effectual clearance to the interior remaining material of extrusion tooling.

In order to solve the problems, a polymer discharging and extruding die is urgently needed, and the die can be suitable for extruding the polymer with low molecular weight (low melt strength), high crystallinity, high heat sensitivity, sensitivity to residual materials and high requirements on discharging and extruding speed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a polymer discharging and extruding die which can be suitable for extruding polymers with low molecular weight (low melt strength), high crystallinity, high heat sensitivity and sensitivity to residual materials.

The utility model adopts the following technical scheme:

a polymer discharge extrusion die, which is characterized by comprising: the extrusion die comprises a feeding port (1), an extrusion die main body (2) and a heat conduction oil jacket (3); the outer layer of the extrusion die main body (2) is provided with a heat conduction oil jacket (3), and the extrusion die main body (2) is connected with an outlet of an extrusion device or a bottom valve of a reaction kettle (in the prior art, the utility model is not the component) through a feeding port (1).

The extrusion die main body (2) is a cavity structure enclosed by an outer wall, and comprises: the device comprises a sub-runner (5), a main runner (8), a main runner outlet (6), a sub-runner outlet (7), a main runner outlet flange (23), a sub-fluid (22) and a sub-runner cover plate (37), wherein the seven components are of an integrated structure;

the sub-runners (5) are positioned on two sides of the main runner (8), and one or more sub-runners (22) are arranged at the outlets (7) of the sub-runners;

the sub-runner cover plate (37) is used for sealing the outer part of the sub-runner discharge hole except the sub-runner outlet (7).

The splitter (22) is a pentagonal prism, the generatrix of the pentagonal prism is perpendicular to the central line of the outlet of the splitter, and one corner of the splitter (22) is sharp and the sharp faces inwards and is used for cutting material flow.

The main runner outlet (6) is sealed by a main runner plug (4) and a flange (23) at the main runner outlet.

The main runner plug (4) is of a convex structure.

The heat conducting oil jacket (3) covers the extrusion die main body (2) and is arranged in all areas except the feeding port (1) and a flange (25) thereof, the main runner outlet (6) and the sub-runner outlet (7).

The heat conducting oil jacket is internally provided with heat conducting oil which is used for heating the material in the extrusion die main body (2);

and a heat conduction oil inlet (32) and a heat conduction oil outlet (31) are formed at two ends of the heat conduction oil jacket (3). Heat conduction oil enters the heat conduction oil jacket from the heat conduction oil inlet (32) and flows out from the heat conduction oil outlet (31).

Advantageous effects

The utility model adopts heat-conducting oil for heating, improves the stability of the thermosensitive polymer and can prevent the material from coking and decomposing; the convex-shaped plug (namely the main flow channel plug 4) is designed at the outlet of the main flow channel, so that the plug can be disassembled, the whole mould can be cleaned conveniently, and the boss of the convex-shaped plug can be inserted into the outlet of the main flow channel and fill the gap at the outlet, so that the formation of a flowing dead angle is avoided, and the stability of the polymer is improved.

Drawings

FIG. 1 is a view showing a practical application scenario of the extrusion die of the present invention

FIG. 2 is a sectional view (front view) of the extrusion die of the present invention

FIG. 3 is a bottom view of the extrusion die of the present invention

FIG. 4 is a sectional view (left view) of the extrusion die of the present invention

In the figure, the position of the upper end of the main shaft,

1-a material inlet, 2-an extrusion die main body, 3-a heat-conducting oil jacket, 4-a main runner plug, 5-a branch runner, 6-a main runner outlet, 7-a branch runner outlet and 8-a main runner;

22-a branch fluid, 23-a flange at an outlet of a main runner, 24-a flange screw hole at the outlet of the main runner, and 25-a flange at an inlet of the main runner;

31-heat-conducting oil outlet, 32-heat-conducting oil inlet, 33-discharging flange at the bottom of the reaction kettle, 34-bottom valve of the reaction kettle, 35-extruded polymer, 36-cooling steel belt, 37-shunt cover plate and 38-extrusion die of the utility model.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

The extrusion die provided by the embodiment is mainly used for extrusion cooling molding of low-viscosity, high-crystallinity and temperature-sensitive polymers such as liquid crystal polymers and polyglycolide during a certain stage of synthesis of the polymers through discharging at the bottom of a reaction kettle.

As shown in fig. 1-4, the present invention provides a polymer discharge extrusion die: a polymer discharging extrusion die comprises a feeding port (1), an extrusion die main body (2) and a heat-conducting oil jacket (3); the outer layer of the extrusion die main body (2) is provided with a heat conduction oil jacket (3), and the extrusion die main body (2) is connected with an outlet of an extrusion device or a bottom valve of a reaction kettle (in the prior art, the utility model is not the component) through a feeding port (1).

The outlet (6) of the main runner is blocked by a main runner plug (4) through an outlet flange (23).

The main runner plug (4) is of a convex structure, the boss of the main runner plug can be inserted into the outlet of the main runner, and the upper surface of the boss and the inner surface of the outlet of the main runner form a plane, so that the phenomenon that old materials are left due to the formation of a flowing dead angle is avoided.

Because the sprue plug can be dismantled, after dismantling, can do the manual cleaning to sprue and the subchannel of both sides thereof, avoid old material to remain.

The mould main body (2) is connected with a discharge valve at the bottom of the reaction kettle through a flange (25). Two sides of a main runner (8) of the mold main body are provided with sub-runners (5), and 4 sub-runners (22) are arranged at outlets (7) of the sub-runners. The crystalline polymer is extruded by the extrusion die to form 6 thin sheets, so that the problem that the sheets are easy to deform in the subsequent cooling and crystallization process is solved.

Heat conducting oil jackets (3) are respectively arranged at the main runner (3) and the sub-runners (5). The heat conducting oil jacket covers all areas except the die main body feeding port (1) and a flange (25) thereof, the main runner outlet (6) and the sub-runner outlet (7), and a heat conducting oil inlet (32) and a heat conducting oil outlet (31) are formed in two ends of the heat conducting oil jacket. The die is heated through the heat conduction oil, so that the whole die is heated more uniformly, and the common phenomenon of nonuniform heating of the electric heating die is avoided.

As shown in fig. 2, 4 shunt bodies (22) are arranged at the shunt outlet (7) at two sides of the die, the shunt bodies (22) are pentagonal prisms, the generatrices of the pentagonal prisms are perpendicular to the central line of the shunt outlet, one corner of each shunt body (22) is sharp, and the sharp faces inwards (the sharp faces are opposite to the flowing direction of the polymer). The pentagonal shunt body can reduce the flow resistance of the polymer, cut the polymer materials from the shunt channel, and form certain gaps among the cut polymer materials, so that the deformation of the polymer in the cooling and crystallizing process is reduced. The production consistency is improved. In the polymer extrusion process, if a large-width plate is extruded, due to the fact that large internal stress is generated under the double effects of cooling shrinkage and crystallization shrinkage, buckling deformation is easy to occur in the plate cooling process, but 6 small plates can be divided into the large-width plate which is extruded by 4 shunt bodies matched with the middle plug, the internal stress can be effectively released, and the problem of buckling deformation in the plate extrusion process can be controlled.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A polymer discharge extrusion die, which is characterized by comprising: the extrusion die comprises a feeding port (1), an extrusion die main body (2) and a heat conduction oil jacket (3); the outer layer of the extrusion die main body (2) is provided with a heat conduction oil jacket (3), the extrusion die main body (2) is connected with an external extrusion equipment outlet through a feeding port (1), and heat conduction oil can be led in the heat conduction oil jacket.

2. A polymer discharge extrusion die as claimed in claim 1, wherein the extrusion die body (2) is a cavity structure enclosed by outer walls, comprising: the device comprises a sub-runner (5), a main runner (8), a main runner outlet (6), a sub-runner outlet (7), a main runner outlet flange (23), a sub-fluid (22) and a sub-runner cover plate (37), wherein the seven components are of an integrated structure;

3. A polymer discharge extrusion die as defined in claim 2 wherein said diverter (22) is a pentagonal prism, the generatrix of the pentagonal prism is perpendicular to the midline of the outlet of the diverter, and one of the sharp corners of the diverter (22) faces inward for cutting the flow.

4. A polymer discharge extrusion die according to claim 2, characterized in that the main flow channel outlet (6) is closed by a main flow channel stopper (4) and a main flow channel outlet flange (23).

5. The polymer discharge extrusion die according to claim 4, characterized in that the main runner choke plug (4) is of a convex structure.

6. The polymer discharging extrusion die according to the claim 1, characterized in that the heat conducting oil jacket (3) covers the extrusion die main body (2).

7. The polymer discharging extrusion die according to claim 1, wherein a heat-conducting oil inlet (32) and a heat-conducting oil outlet (31) are arranged at two ends of the heat-conducting oil jacket (3).