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CN-121973418-A - Extrusion equipment and method for producing high-heat-insulation PVB intermediate film

CN121973418ACN 121973418 ACN121973418 ACN 121973418ACN-121973418-A

Abstract

The invention relates to the technical field of extrusion molding, and particularly discloses extrusion equipment and a method for producing a high-heat-insulation PVB intermediate film. The invention drives the suspension sleeve to eccentrically swing through the rotary drum, forcibly throws up the nano particles which are settled to the bottom of the extrusion cylinder, eliminates the aggregate pulse, avoids the generation of crystal points of PVB film, simultaneously eliminates the deposition detention layer of the screw groove, eliminates the abrasion of the extrusion cylinder, ensures the long-term stability of extrusion pressure, and in the extrusion flow passage formed by the extrusion head and the drainage core body, the radial expansion piece periodically changes pressure, regulates and controls, rolls up the particles and promotes dispersion, so that the melt does not have high-strength aggregate impact when passing through the subsequent filtering device, and the fatigue fracture of the filtering element is effectively prevented.

Inventors

  • YIN QI
  • CHEN CHEN

Assignees

  • 吉林诺德高科新材料有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (10)

  1. 1. Extrusion equipment is used in production of high thermal-insulated PVB intermediate coat, characterized in that includes: a frame (100); A screw extrusion unit (200) which is provided on the frame (100) and includes an extrusion barrel (210) fixed on the frame (100) and an extrusion screw (230) rotatably provided in the extrusion barrel (210); The eccentric suspension material throwing unit (300) is arranged at the middle section of the extrusion cylinder (210) and comprises a rotary cylinder (320) rotationally connected with the extrusion cylinder (210) and a suspension sleeve (340) eccentrically and movably embedded in the rotary cylinder (320); The variable-section runner unit (400) is arranged at the outlet end of the extrusion barrel (210) and comprises an extrusion head (410) detachably connected with the extrusion barrel (210) and a drainage core body (420) coaxially fixed in the extrusion head (410), an extrusion runner (421) is formed between the extrusion head (410) and the drainage core body (420), and a radial expansion piece is arranged in the extrusion runner (421); and a feeding unit (500) provided at the inlet end of the extrusion cylinder (210) and used for feeding the extrusion raw material into the extrusion cylinder (210).
  2. 2. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 1, wherein the spiral extrusion unit (200) further comprises a driving motor (220) fixedly installed at one end of the extrusion barrel (210), an output end of the driving motor (220) is connected with the extrusion screw (230), and spiral extrusion blades (240) which are matched with the inside of the extrusion barrel (210) are arranged on the extrusion screw (230).
  3. 3. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 1, wherein the eccentric suspension material throwing unit (300) further comprises an isolating ring (310) fixed on inner walls at two ends of the extrusion barrel (210) corresponding to the rotary barrel (320), the isolating ring (310) is used for axially limiting two ends of the suspension sleeve (340), a lubrication cavity (330) is formed between the suspension sleeve (340) and the rotary barrel (320), and two ends of the lubrication cavity (330) are respectively connected with a liquid inlet pipe (331) and a liquid outlet pipe (332).
  4. 4. A high thermal insulation PVB interlayer production extrusion apparatus according to claim 3, wherein a rotating motor (350) is fixedly installed on the frame (100), an output end of the rotating motor (350) is connected with a rotating gear (360), a rotating gear ring (370) meshed with the rotating gear (360) is arranged on the outer portion of the rotary drum (320), and a convex edge (380) abutted to the suspension sleeve (340) is arranged inside the rotary drum (320).
  5. 5. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 1, wherein the drainage core body (420) is coaxially fixed in the extrusion head (410) through a plurality of fixing columns (430) which are uniformly distributed in the circumferential direction, an arc-shaped concave portion (440) is arranged on the drainage core body (420), and the radial expansion piece is positioned at the arc-shaped concave portion (440).
  6. 6. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 5, wherein the radial expansion piece comprises a radial expansion capsule body (450) which is arranged on the inner wall of the extrusion head (410) and is matched with the arc-shaped concave part (440), and an air nozzle (460) which is communicated with the inside of the radial expansion capsule body (450) is arranged on the extrusion head (410).
  7. 7. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 5, wherein a plurality of groups of U-shaped flow channels (470) are circumferentially arranged in the drainage core body (420), communication holes (480) are respectively formed in two ends of each U-shaped flow channel (470), and connecting nozzles (490) communicated with the corresponding communication holes (480) are respectively arranged on the fixing columns (430) respectively corresponding to the two ends of each U-shaped flow channel (470).
  8. 8. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 1, wherein the feeding unit (500) comprises a hopper (510) connected with an inlet end of the extrusion cylinder (210), rotating shafts (520) are symmetrically arranged on two sides in the hopper (510) in a rotating mode, shifting plates (530) are arranged on the rotating shafts (520), mutually meshed driven gears (540) are arranged on two groups of rotating shafts (520), a driving gear (550) is sleeved on the extrusion screw (230), an intermediate gear (560) meshed with the driving gear (550) is rotatably arranged on the outer wall of the hopper (510), and the intermediate gear (560) is meshed with one group of driven gears (540).
  9. 9. The extrusion equipment for producing the high-heat-insulation PVB intermediate film according to claim 8 is characterized in that a central chamber (521) is formed in the rotating shaft (520), a permeable membrane (522) communicated with the inside of the hopper (510) is embedded in the central chamber (521), a bearing seat (570) is fixedly arranged outside the hopper (510), one end of the rotating shaft (520) is rotatably sleeved in the bearing seat (570), an annular transition chamber (571) is formed in the bearing seat (570), a transfusion tube (580) communicated with the annular transition chamber (571) is arranged outside the bearing seat (570), a connecting cavity (523) communicated with the central chamber (521) is formed at one end of the rotating shaft (520), and a plurality of through holes (524) communicated with the annular transition chamber (571) are formed in the circumference of the inner wall of the connecting cavity (523).
  10. 10. A method of using the extrusion apparatus for producing highly insulating PVB interlayer film of any one of claims 1-9 comprising the steps of: Step one, a mixed raw material of PVB resin and nanometer heat insulation particles is put into an extrusion cylinder (210) through a feeding unit (500), heated and melted, and then continuously pushed to the direction of an extrusion head (410) by an extrusion screw (230); Step two, driving a suspension sleeve (340) to eccentrically swing along the radial direction through a rotary drum (320), periodically throwing up nano particles deposited at the bottom upwards, and carrying out omnibearing extrusion on a melt; Step three, when the raw material flows through the extrusion flow channel (421), gas is periodically introduced and extracted through the gas nozzle (460), so that the radial expansion piece is periodically contracted and expanded, the sectional area of the flow channel is dynamically changed, the flow velocity of the contracted section is increased to roll up deposited particles, and turbulence is generated in the expanded section to promote further mixing; And step four, extruding the fully dispersed raw materials from an outlet of an extrusion head (410).

Description

Extrusion equipment and method for producing high-heat-insulation PVB intermediate film Technical Field The invention relates to the technical field of extrusion molding, in particular to extrusion equipment and a method for producing a high-heat-insulation PVB intermediate film. Background In the production of high heat-insulating PVB intermediate film, it is often necessary to add high concentration of nano inorganic heat-insulating particles (such as nano tin antimony oxide ATO, nano indium tin oxide ITO or cesium tungsten bronze) into the matrix for excellent heat-insulating effect) The particles have the characteristics of high hardness and high specific surface area, and uniform dispersion is a key for ensuring the optical quality and the heat insulation performance of the film. When the melt containing high-hardness nano particles enters the extrusion equipment, a low-pressure reflux area exists on the back of a screw rib of the screw, the melt flows slowly, nano agglomerates are easy to deposit and concentrate in the area due to larger inertia, when the melt is accumulated to a certain extent, the nano agglomerates are suddenly washed away by a main runner to form instantaneous high-concentration agglomerate pulses, macroscopic crystal points or fish eyes defects are finally formed in a PVB film, meanwhile, in a microstructure at the bottom of a groove of the screw, a retention layer is formed due to nano particle deposition, particles are continuously agglomerated in eddy dead angles of micro areas such as the back of the rib, once the hard agglomerates are formed, the inner wall of an extrusion cylinder is scratched under the subsequent extrusion pressure, so that radial uneven abrasion is caused, and the long-term stability of the extrusion pressure is seriously influenced. Disclosure of Invention In order to overcome the technical problems, the invention provides extrusion equipment and method for producing a high-heat-insulation PVB intermediate film. The aim of the invention can be achieved by the following technical scheme: Extrusion equipment is used in production of high thermal-insulated PVB intermediate coat, includes: A frame; The spiral extrusion unit is arranged on the frame and comprises an extrusion cylinder fixed on the frame and an extrusion screw rod rotatably arranged in the extrusion cylinder; The eccentric suspension material throwing unit is arranged at the middle section of the extrusion cylinder and comprises a rotary cylinder rotationally connected with the extrusion cylinder and a suspension sleeve eccentrically and movably embedded in the rotary cylinder; The variable cross-section runner unit is arranged at the outlet end of the extrusion barrel and comprises an extrusion head detachably connected with the extrusion barrel and a drainage core body coaxially fixed in the extrusion head, an extrusion runner is formed between the extrusion head and the drainage core body, and a radial expansion piece is arranged in the extrusion runner; and the feeding unit is arranged at the inlet end of the extrusion cylinder and is used for feeding extrusion raw materials into the extrusion cylinder. As a further scheme of the invention, the spiral extrusion unit further comprises a driving motor fixedly arranged at one end of the extrusion cylinder, the output end of the driving motor is connected with the extrusion screw, and the extrusion screw is provided with spiral extrusion blades which are matched with the inside of the extrusion cylinder. As a further scheme of the invention, the eccentric suspension material throwing unit further comprises an isolating ring fixed on the inner walls of the two ends of the extrusion cylinder, the isolating ring is used for axially limiting the two ends of the suspension sleeve, a lubrication cavity is formed between the suspension sleeve and the rotary cylinder, and the two ends of the lubrication cavity are respectively connected with a liquid inlet pipe and a liquid outlet pipe. As a further scheme of the invention, a rotating motor is fixedly arranged on the frame, the output end of the rotating motor is connected with a rotating gear, a rotating gear ring meshed with the rotating gear is arranged outside the rotary drum, and a convex edge abutting against the suspension sleeve is arranged inside the rotary drum. As a further scheme of the invention, the drainage core body is coaxially fixed in the extrusion head through a plurality of circumferentially uniformly distributed fixing columns, an arc-shaped concave part is arranged on the drainage core body, and the radial expansion piece is positioned at the arc-shaped concave part. As a further scheme of the invention, the radial expansion piece comprises a radial expansion bag body which is arranged on the inner wall of the extrusion head and is matched with the arc-shaped concave part, and the drainage core body is provided with an air tap which is communicated with the inner part of the radi