CN211251285U

CN211251285U - Double-screw extruder for promoting melt blending of polyolefin extinction master batch

Info

Publication number: CN211251285U
Application number: CN201922223945.0U
Authority: CN
Inventors: 王锦江; 周慕纯; 刘文全; 陈嘉欣
Original assignee: Shantou Best Science And Technology Co ltd
Current assignee: Shantou Best Science And Technology Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-08-14
Anticipated expiration: 2029-12-12

Abstract

The utility model discloses a double screw extruder for promoting melt blending of polyolefin extinction master batch, which comprises a frame and is characterized in that one end of the frame is provided with a motor set, the other end of the frame is provided with an extrusion cylinder, the extrusion cylinder and a first feeding device are arranged between the motor set, the outer side of the extrusion cylinder is provided with a heating system, the top of the extrusion cylinder is provided with a second feeding device, the inside of the extrusion cylinder is respectively provided with a first screw and a second screw, the first screw and the second screw are respectively connected with the motor set, the prepared master batch has good dispersibility and excellent extinction performance, has no bright spots and white spots, has uniform cloud and mist effect, adjusts the addition amount of the master batch according to the requirement of a client to obtain extinction effects of different levels, and especially can obtain a super extinction film with high haze (85%) and low glossiness (not more than 10%), in addition, the master batch die lip is less in precipitation, the processing time is long, and the production efficiency of the film is improved.

Description

Double-screw extruder for promoting melt blending of polyolefin extinction master batch

Technical Field

The utility model relates to an extrusion device's technical field has especially related to a double screw extruder who promotes polyolefin extinction masterbatch melt blending.

Background

The principle of the common extinction master batch on the market is to make a polyolefin film rough so as to achieve the extinction effect, the common formula is formed by a blending system of polypropylene and high-density polyethylene, the principle is that the incompatible characteristics of PP and PE are utilized, the crystallization characteristics of the two resins generate rough surfaces in the cooling and drawing process, specifically, the PE has a small melt index in a melting state, the PP has a large melt index, the PP wraps the PE, the PE is dispersed in the PP to form a sea-island structure, when the system is melted and extruded, the system is rapidly quenched by compressed air or water, in the process of lowering the melt temperature, the PP firstly reaches the crystallization temperature and starts crystallization, so that the wrapped non-crystallized PE melt is limited, the temperature continues to be lowered, the PE melt temperature is reached, and the PE crystallization speed is far higher than the crystallization speed of the PP, therefore, when PE starts to crystallize, the surface of the extruded polymer is immediately solidified, shrunk, and hardened, thereby producing a rough surface and having a very large roughness during drawing, and thus achieving a matte effect.

If a very uniform extinction effect is to be obtained, PP and PE, inorganic titanium white, an antioxidant and the like are required to be effectively dispersed and blended, due to the particularity of the materials, PP and PE are difficult to be uniformly blended, the haze and the glossiness of the film prepared in the way are easy to generate anisotropy in the whole width, the extinction effect is poor, if the film is excessively sheared, molecular chains are excessively broken, small molecules are increased, die orifice separation occurs in later processing, the appearance of the product is influenced, a machine is required to be stopped for cleaning a die head, the production efficiency is reduced, and therefore an extruder capable of well melting and blending different types of resins with different melt indexes and melt viscosities is required.

SUMMERY OF THE UTILITY MODEL

The utility model provides a double screw extruder for promoting melt blending of polyolefin extinction master batch to solve the above mentioned problem.

The technical proposal of the utility model is as follows: a double-screw extruder for promoting melt blending of polyolefin extinction master batch comprises a frame and is characterized in that a motor set is arranged at one end of the frame, an extrusion cylinder is arranged at the other end of the frame, a first feeding device is arranged between the extrusion cylinder and the motor set and connected with the extrusion cylinder, a heating system is arranged outside the extrusion cylinder and comprises a first heating section, a second heating section, a third heating section and a fourth heating section, the first heating section, the second heating section, the third heating section and the fourth heating section are respectively arranged outside the extrusion cylinder, a second feeding device is arranged at the top of the extrusion cylinder, the second feeding device is arranged between the third heating section and the fourth heating section and connected with the extrusion cylinder, a first screw and a second screw are respectively arranged inside the extrusion cylinder, first screw rod extends to first heating segmentation outside, the second screw rod extends to fourth heating segmentation outside, and second screw rod flight is the screw structure, crowded feed cylinder is inside to be equipped with first thread groove and second thread groove, just first screw rod sets up inside first thread groove, and the second screw rod sets up inside the second thread groove to cooperate with the second thread groove, motor unit is connected respectively to first screw rod and second screw rod.

Preferably, the first feeding device and the second feeding device are respectively provided with a hopper at the top and a stirring and feeding device at the bottom, and a weighing instrument is arranged between the hopper and the stirring and feeding device.

Preferably, a blending cavity is arranged inside the extruding cylinder, the first screw and the second screw are arranged inside the blending cavity, and an extruding hole is arranged at one end of the blending cavity.

Preferably, the heating system comprises a controller, and the controller is electrically connected with the first heating section, the second heating section, the third heating section and the fourth heating section respectively.

Preferably, a cooling pipe is arranged at one end of the outer side of the extruding cylinder, and the cooling pipe is connected with a cooling box.

Preferably, the first heating section, the second heating section, the third heating section and the fourth heating section adopt resistance section heating.

Compared with the prior art, the following is the beneficial effects of the utility model: by adopting a double-screw melt blending extrusion mode, the prepared master batch has good dispersibility, excellent extinction performance, no bright spots and white spots and uniform cloud and mist effect. The addition amount of the master batch can be adjusted according to the requirements of customers to obtain different levels of extinction effect. Particularly, the super extinction film with high haze (not less than 85%) and low glossiness (not more than 10%) can be obtained, in addition, the precipitation of master batch die lips is less, the processing time is long, the production efficiency of the film is improved, the use cost and the transportation cost are saved, and the super extinction film is safe and environment-friendly.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the structure of the material extruding cylinder of the present invention.

With reference to the attached drawings: the device comprises a frame 1, a squeezing barrel 2, a motor group 3, a first screw 4, a second screw 5, a first feeding device 6, a second feeding device 7, a controller 10, a first heating section 11, a second heating section 12, a third heating section 13, a fourth heating section 14, a blending cavity 20, a hopper 61, a weighing instrument 62, a stirring and feeding device 63, a cooling tank 80, a cooling pipe 88, an extrusion hole 100, a first spiral groove 201 and a second spiral groove 202.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defined as "first", "second" may explicitly or implicitly include one or more such features, in the description of the invention "plurality" means two or more unless explicitly and specifically defined otherwise.

The present invention will be further explained with reference to the accompanying drawings:

a double-screw extruder for promoting melt blending of polyolefin extinction master batch comprises a frame 1 and is characterized in that a motor set 3 is arranged at one end of the frame 1, a material extruding barrel 2 is arranged at the other end of the frame 1, a first feeding device 6 is arranged between the material extruding barrel 2 and the motor set 3, the first feeding device 6 is connected with the material extruding barrel 2, a heating system is arranged outside the material extruding barrel 2 and comprises a first heating section 11, a second heating section 12, a third heating section 13 and a fourth heating section 14, the first heating section 11, the second heating section 12, the third heating section 13 and the fourth heating section 14 are respectively arranged outside the material extruding barrel 2, a second feeding device 7 is arranged at the top of the material extruding barrel 2, and the second feeding device 7 is arranged between the third heating section 13 and the fourth heating section 14, the second feeding device 7 is connected with the extruding cylinder 2, a first screw rod 4 and a second screw rod 5 are respectively arranged inside the extruding cylinder 2, the first screw rod 4 extends to the outside of the first heating section 11, the second screw rod 5 extends to the outside of the fourth heating section 14, the screw edge of the second screw rod 5 is of a spiral structure, a first screw groove 201 and a second screw groove 202 are arranged inside the extruding cylinder 2, the first screw rod 4 is arranged inside the first screw groove 201, the second screw rod 5 is arranged inside the second screw groove 202 and matched with the second screw groove 202, and the first screw rod 4 and the second screw rod 5 are respectively connected with the motor set 3.

The top parts of the first feeding device 6 and the second feeding device 7 are respectively provided with a hopper 61, the bottom parts of the first feeding device and the second feeding device are respectively provided with a stirring feeding device 63, a weighing instrument 62 is arranged between the hopper 61 and the stirring feeding device 63, the blanking amount is strictly controlled, and a weightless scale is adopted aiming at the light weight of the slipping agent, so that the normal content of the slipping agent in the master batch is controlled, and the quality of the master batch is ensured.

The extrusion cylinder 2 is internally provided with a blending cavity 20, the first screw 4 and the second screw 5 are arranged inside the blending cavity 20, one end of the blending cavity 20 is provided with an extrusion hole 100, the first screw 4 and the second screw 5 realize blending in the blending cavity 20, and the first screw 4 and the second screw 5 are in opposite rotation directions, so that sufficient melting and blending of master batches are facilitated.

The heating system comprises a controller 10, wherein the controller 10 is respectively and electrically connected with a first heating section 11, a second heating section 12, a third heating section 13 and a fourth heating section 14, so that the heating of 4 sections can be controlled and managed conveniently, and the heating temperatures of the 4 sections can be different.

The one end in the crowded feed cylinder 2 outside is provided with cooling tube 88, cooling tube 88 is connected with cooling tank 80, and cooling tube 88 sets up the one end near extruding hole 100, and the cooling of being convenient for makes the masterbatch extrude the organism with solid form, the subsequent processing of being convenient for.

The first heating section (11), the second heating section (12), the third heating section (13) and the fourth heating section (14) adopt resistance section heating, the heating efficiency by adopting resistance heating is high, the effect is good, 4 sections adopt different resistance heating, the heating temperature of each section is different, and the material characteristics of the polyolefin extinction master batch are suitable for being prepared.

Aiming at the particularity of light weight and the like of the slipping agent, the blanking control is respectively carried out on the machine body through two feeding channels, the designed first screw rod 4 and the designed second screw rod 5 provide high shearing force to disperse at a lower rotating speed, the whole process adopts numerical control network pressure control, the dispersibility of the additive in a melt is monitored, if the prepared material is agglomerated in the master batch or is difficult to disperse, the network pressure or the prepared material suddenly rises, the equipment prompts abnormal alarm, and simultaneously, the ash content in the master batch is monitored through every half hour, the content of the slipping agent in the master batch is detected, the dispersibility of the slipping agent in the master batch is monitored from the aspects of processing and detection, different materials are driven by the first screw rod 4 and the second screw rod 5 which are oppositely turned, and the characteristics of the materials prepared from the master batch are different.

By adopting a double-screw melt blending extrusion mode, the prepared master batch has good dispersibility, excellent extinction performance, no bright spots and white spots and uniform cloud and mist effect. The addition amount of the master batch can be adjusted according to the requirements of customers to obtain different levels of extinction effect. Particularly, the super extinction film with high haze (not less than 85%) and low glossiness (not more than 10%) can be obtained, in addition, the precipitation of master batch die lips is less, the processing time is long, the production efficiency of the film is improved, the use cost and the transportation cost are saved, and the super extinction film is safe and environment-friendly.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A double-screw extruder for promoting melt blending of polyolefin extinction master batch comprises a rack (1) and is characterized in that a motor set (3) is arranged at one end of the rack (1), an extrusion cylinder (2) is arranged at the other end of the rack, a first feeding device (6) is arranged between the extrusion cylinder (2) and the motor set (3), the first feeding device (6) is connected with the extrusion cylinder (2), a heating system is arranged on the outer side of the extrusion cylinder (2), the heating system comprises a first heating section (11), a second heating section (12), a third heating section (13) and a fourth heating section (14), the first heating section (11), the second heating section (12), the third heating section (13) and the fourth heating section (14) are respectively arranged on the outer side of the extrusion cylinder (2), and a second feeding device (7) is arranged at the top of the extrusion cylinder (2), and the second feeding device (7) is arranged between the third heating section (13) and the fourth heating section (14), the second feeding device (7) is connected with the extruding cylinder (2), a first screw (4) and a second screw (5) are respectively arranged in the extruding cylinder (2), the first screw (4) extends to the outside of the first heating section (11), the second screw (5) extends to the outside of the fourth heating section (14), the screw edge of the second screw (5) is in a spiral structure, a first screw groove (201) and a second screw groove (202) are arranged in the extruding cylinder (2), the first screw (4) is arranged in the first screw groove (201), the second screw (5) is arranged in the second screw groove (202), and the first screw rod (4) and the second screw rod (5) are respectively connected with the motor set (3).

2. The twin-screw extruder for facilitating melt blending of a polyolefin matte master batch as claimed in claim 1, wherein: the top parts of the first feeding device (6) and the second feeding device (7) are respectively provided with a hopper (61), the bottom parts of the first feeding device and the second feeding device are provided with a stirring and feeding device (63), and a weighing instrument (62) is arranged between the hopper (61) and the stirring and feeding device (63).

3. The twin-screw extruder for facilitating melt blending of a polyolefin matte master batch as claimed in claim 1, wherein: the extruding cylinder (2) is internally provided with a blending cavity (20), the first screw (4) and the second screw (5) are arranged in the blending cavity (20), and one end of the blending cavity (20) is provided with an extruding hole (100).

4. The twin-screw extruder for facilitating melt blending of a polyolefin matte master batch as claimed in claim 1, wherein: the heating system comprises a controller (10), wherein the controller (10) is electrically connected with a first heating section (11), a second heating section (12), a third heating section (13) and a fourth heating section (14) respectively.

5. The twin-screw extruder for facilitating melt blending of a polyolefin matte master batch as claimed in claim 1, wherein: and a cooling pipe (88) is arranged at one end of the outer side of the extruding cylinder (2), and the cooling pipe (88) is connected with a cooling box (80).

6. The twin-screw extruder for facilitating melt blending of a polyolefin matte master batch as claimed in claim 1, wherein: the first heating section (11), the second heating section (12), the third heating section (13) and the fourth heating section (14) adopt resistance section heating.