CN114770898A - PVB production equipment and process adopting single-screw extrusion - Google Patents

Abstract

The invention discloses a single-screw extruded PVB production equipment and a production process, comprising: a resin storage bin; The weight loss metering system is connected; the horizontal mixer, the feed port of the horizontal mixer is connected with the discharge port of the twin-screw premixer, and the horizontal mixer is provided with a load cell. This single-screw extruded PVB production equipment and production process are produced by a modified process. The PVB resin powder, plasticizer and aqueous solution additives are premixed. The whole process takes about 15 minutes or more. The resin powder and liquid are plasticized. The agent has been fully absorbed and evenly dispersed, which has qualitatively improved the performance of the PVB film, achieving uniform and balanced performance; at the same time, a single-screw production process is adopted, which is forced feeding, which can be stably extruded and has reliable quality. Its products have sound insulation and heat insulation, which is conducive to the improvement of product quality.

Description

A kind of single-screw extrusion PVB production equipment and production process

technical field

The invention relates to the technical field of automobile laminated glass, in particular to a single-screw extruded PVB production equipment and a production process.

Background technique

Laminated glass, also known as laminated glass, is composed of two or more pieces of glass with one or more layers of organic polymer interlayers sandwiched between them. After special high temperature pre-pressing (or vacuuming) and high temperature and high pressure processing, A composite glass product that permanently bonds the glass to the interlayer. Commonly used interlayer films for laminated glass are: PVB, SGP, EVA, PU, etc. Automotive laminated glass usually adopts PVB interlayer.

At present, all PVB film production processes in China are extruded by twin-screw extruders, and plasticizers are produced in the barrel injection process. In this process, the residence time in the extruder is very short after the plasticizer is injected, and it is extruded to the screen changer in less than one minute—melt pump—filter—second melt pump—static mixer— The exit of the die head will cause serious uneven dispersion between the plasticizer (including other additives) and the PVB resin; at the same time, research has proved that the PVB film produced by the twin-screw extrusion process, even in the same product roll, Sampling and analysis at different locations, the physical and mechanical properties, and glass bonding properties are quite different.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the existing defects and provide a single-screw extrusion PVB production equipment and production process, which fully absorb and uniformly disperse the resin powder and the liquid plasticizer. The performance is qualitatively improved, and the performance is uniform and balanced; the single-screw production process is adopted, which is forced feeding and stable extrusion, which can effectively solve the problems in the background technology.

For achieving the above object, the present invention provides the following technical solutions: a single-screw extruded PVB production equipment, comprising:

resin storage bin;

Twin-screw pre-mixer, the feed port of the twin-screw pre-mixer is connected with the discharge port of the resin storage bin through a weight loss metering system 1;

A horizontal mixer, the feed port of the horizontal mixer is connected with the discharge port of the twin-screw premixer, and a load cell is arranged on the horizontal mixer;

Water-cooled screw conveyor, the feed port of the water-cooled screw conveyor is connected with the discharge port of the horizontal mixer, and the discharge port of the horizontal mixer is provided with a discharge valve;

A forced feeding tank, the feeding end of the forced feeding tank is connected with the discharge port of the water-cooled screw conveyor;

Single-screw extruder, the feed port of the single-screw extruder is connected with the discharge port of the forced feeding tank, the discharge port of the single-screw extruder is connected with the first-stage melt pump, and the single-screw extruder is connected to the discharge port of the forced feeding tank. A screen changer is arranged between the discharge machine and the primary melt pump, the primary melt pump is connected with the secondary melt pump through a precision filter, the secondary melt pump is connected with a static mixer, and the static mixer adapter Attach the extrusion die.

As a preferred technical solution of the present invention, the twin-screw premixer is provided with injection holes for plasticizer and aqueous solution.

As a preferred technical solution of the present invention, a water-cooling connector is connected to the discharge port of the twin-screw premixer.

As a preferred technical solution of the present invention, both the twin-screw premixer and the horizontal mixer are provided with a cooling water interlayer.

As a preferred technical solution of the present invention, the horizontal mixer is further provided with another feed port, and the other feed port of the horizontal mixer is connected to the discharge port of the cooling silo through the second weight loss metering system.

As a preferred technical solution of the present invention, the diameter of the screw of the single-screw extruder is . inch-inch, and the aspect ratio is .

The invention provides the following technical solutions: a single-screw extruded PVB production process:

PVB resin powder enters the resin storage silo through the vacuum feeding system, and then is accurately and continuously metered and conveyed to the twin-screw premixer through the weight loss metering system, and the rotation speed of the twin-screw premixer is 50-200 rpm;

Continuously pour cooling water into the cooling water interlayer of the twin-screw premixer to prevent the mixed resin powder from swelling;

The plasticizer and aqueous solution are injected into the twin-screw premixer through the plasticizer and aqueous solution injection holes, and the weight loss metering device is used to accurately inject in the mixing process to realize the mixing of the formula ratio;

The pre-mixed resin powder is continuously conveyed and discharged into the horizontal mixer;

On-line and off-line PVB recovered shredded materials are continuously metered into the horizontal mixer from another feeding port through the cooling silo and the weight loss metering system II;

The cooling water is continuously fed into the cooling water interlayer of the horizontal mixer;

The horizontal mixer controls the load through the load cell and external controller to realize the control of the conveying volume of the twin-screw premixer and the cooling silo;

The horizontal mixer keeps running continuously at a speed of 20-50 rpm;

The horizontal mixer discharges the material through the discharge valve to the inlet of the water-cooled screw conveyor, then enters the water-cooled screw conveyor, and then sends it to the single-screw extruder through the forced feeding tank;

The opening of the discharge valve is controlled by the material level of the material bin of the single-screw extruder, which is opened when the material level is low and closed when the material level is high;

The mixed powder (containing PVB resin powder, plasticizer, processing aid aqueous solution, trimming material) is forced to enter the single-screw extruder for plasticization and extrusion through the forced feeding screw, and then passes through the screen changer, the first-stage melt pump, the precision Filter, secondary melt pump, static mixer, extrusion die, extrude the sheet from the extrusion die to the water tank, enter the subsequent cooling and forming, dewatering and drying, dehumidification and shaping to control shrinkage, trimming and embossing, Cooling, thickness measurement, defect detection until the lamination winding completes the whole process of product production.

As a preferred technical solution of the present invention, the temperature of the cooling water interlayer on the twin-screw premixer and the cooling water interlayer on the horizontal mixer is 5-10 degrees, and the cooling water interlayer on the horizontal mixer is fed with cooling water The temperature is 5-15 degrees, the cooling water interlayer of the water-cooled screw conveyor continues to pass cooling water to 7-15 degrees, and the center of the built-in conveying screw of the water-cooled screw conveyor is 7-15 degrees. .

As a preferred technical solution of the present invention, the extrusion capacity of the single-screw extruder is 200-3500 kg/h.

As a preferred technical solution of the present invention, the filtering precision of the screen changer is 100-40um.

Compared with the prior art, the beneficial effects of the present invention are as follows: the PVB production equipment and production process of the single-screw extrusion are produced by using a modified process, and the PVB resin powder, plasticizer and aqueous solution additives are premixed, and the whole process is It takes about 15 minutes or more to fully absorb and uniformly disperse the resin powder and liquid plasticizer, and qualitatively improve the performance of the PVB film, achieving uniform and balanced performance; It is forced feeding, can be stably extruded, and has reliable quality. Its products are sound and heat insulation, which is conducive to the improvement of product quality.

Description of drawings

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

In the picture: 1 resin storage bin, 2 weight loss metering system 1, 3 twin-screw premixer, 4 plasticizer and aqueous solution injection holes, 5 water cooling connector, 6 horizontal mixer, 7 load cell, 8 discharge valve , 9 water-cooled screw conveyors, 10 forced feeding tanks, 11 single screw extruders, 12 screen changers, 13 primary melt pumps, 14 precision filters, 15 secondary melt pumps, 16 static mixers, 17 Extrusion die, 18 cooling silos, 19 weight loss metering system II.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figure 1, the present invention provides a technical solution: a single-screw extrusion PVB production equipment, including a resin storage bin 1, which is connected to an external vacuum feeding system; a twin-screw premixer 3, a twin-screw premixer The feed port of machine 3 and the discharge port of resin storage bin 1 are connected by weight loss measurement system-2. After PVB resin powder enters the resin storage bin through the vacuum feeding system, and then passes through the weight loss measurement system, such as Kaikai, Brabenda , Kubota and other accurate and continuous metering delivery to the twin-screw premixer.

Further, the design length-diameter ratio of the screw is 7-20, and the diameter and center distance are determined according to the actual production requirements, generally 100-200mm.

The twin-screw premixer is made of corrosion-resistant stainless steel alloy. The screws rotate in the same direction. The screw is designed with conveying screw blocks, shearing and mixing blocks, etc. (instructions). .

The equipment also includes a horizontal mixer 6, the feed port of the horizontal mixer 6 is connected with the discharge port of the twin-screw premixer 3, and the premixed resin powder is continuously conveyed and discharged into the horizontal mixer 6, The horizontal mixer 6 is provided with a load cell 7, which can control the load in conjunction with an external controller (such as a PLC controller, a single-chip microcomputer, etc.) to realize the control of the conveying volume of the twin-screw premixer 3 and the cooling silo 18;

The horizontal mixer keeps running continuously at a speed of 20-50 rpm;

Water-cooled screw conveyor 9, the feed port of the water-cooled screw conveyor 9 is connected with the discharge port of the horizontal mixer 6, and the discharge port of the horizontal mixer 6 is provided with a discharge valve 8, which is electric Or pneumatic or hydraulic valve, the opening of the discharge valve is controlled by the material level of the single-screw extruder silo, and the low level opens to the high level and closes;

The water-cooled screw conveyor 9 is made of stainless steel, with cooling water interlayer, cooling water of 7-15 degrees inside, designed with built-in conveying screw, and cooling water of 7-15 degrees in the center.

A forced feeding tank 10, the feeding end of the forced feeding tank 10 is connected with the discharge port of the water-cooled screw conveyor 9, and is used for forced feeding of the extruder;

Single-screw extruder 11, the feed port of the single-screw extruder 11 is connected to the discharge port of the forced feeding tank 10, and the discharge port of the single-screw extruder 11 is connected to the first-stage melt pump 13 For connection, the first-stage melt pump 13 is preferably a Jingcheng or Marg sixth-generation high-quality gear pump; a screen changer 12 is provided between the single-screw extruder 11 and the first-stage melt pump 13, and the filtration accuracy is 100-40um; the The primary melt pump 13 and the secondary melt pump 15 are connected through a precision filter 14, the precision filter 14 is preferably a Marg candle filter, and the secondary melt pump is preferably a high-quality product of Jingcheng or Marg sixth generation; The body pump 15 is connected with the static mixer 16, the static mixer 16 is designed with a temperature adjustment function, and Marg SR series products can be selected; the static mixer 16 adapter is connected to the extrusion die 17.

Further, the single-screw extruder 11 is also provided with a first-stage vacuum exhaust device.

Preferably, the twin-screw premixer 3 is provided with a plasticizer and an aqueous solution injection hole 4, and a weight-loss metering device such as Kaikai is used for precise injection during the mixing process to achieve formula ratio mixing.

Preferably, a water-cooling connector 5 is connected to the discharge port of the twin-screw premixer 3 .

Preferably, both the twin-screw premixer 3 and the horizontal mixer 6 are provided with a cooling water interlayer, which is used to cool the mixed material and prevent the mixed resin powder from swelling.

Preferably, the horizontal mixer 6 is further provided with another feed port, and the other feed port of the horizontal mixer 6 is connected to the discharge port of the cooling silo 18 through the weight loss metering system 2 19, and the cooling silo 18. External on-line and off-line PVB recycling and shredding material transportation.

Preferably, the diameter of the screw of the single-screw extruder 11 is 4.5 inches to 12 inches, and the aspect ratio is 30 to 43.

The invention provides the following technical solutions: a single-screw extruded PVB production process:

The PVB resin powder enters the resin storage bin 1 through the vacuum feeding system, and then is accurately and continuously metered and delivered to the twin-screw premixer 3 through the weight loss metering system-2, and the rotational speed of the twin-screw premixer 3 is 50-200 rpm;

The cooling water is continuously fed into the cooling water interlayer of the twin-screw premixer 3 to prevent the mixed resin powder from swelling;

The plasticizer and the aqueous solution are injected into the twin-screw premixer 3 through the plasticizer and aqueous solution injection hole 4, and the weight loss metering device is used for precise injection during the mixing process to realize formula ratio mixing;

The pre-mixed resin powder is continuously conveyed and discharged into the horizontal mixer 6;

On-line and off-line PVB recovered shredded materials are continuously metered into the horizontal mixer 6 from another feeding port through the cooling silo 18 and the weight loss metering system II 19;

The cooling water is continuously fed into the cooling water interlayer of the horizontal mixer 6;

The horizontal mixer 6 controls the load through the load cell 7 and the external controller, etc., to realize the control of the conveying volume of the twin-screw premixer 3 and the cooling silo 18;

The horizontal mixer 6 keeps running continuously, and the running speed is 20-50 rpm;

The horizontal mixer 6 discharges the material through the discharge valve 8 to the inlet of the water-cooled screw conveyor 9, and then enters the water-cooled screw conveyor 9, and then is transported to the single-screw extruder 11 through the forced feeding tank 10;

The opening of the discharge valve 8 is controlled by the material level of the material bin of the single-screw extruder 11, and is opened when the material level is low and closed when the material level is high;

The mixed powder (containing PVB resin powder, plasticizer, processing aid aqueous solution, trimming material) enters the single-screw extruder 11 for plasticization and extrusion through the forced feeding screw, and then passes through the screen changer 12 and the first-stage melt pump in turn. 13. Precision filter 14, secondary melt pump 15, static mixer 16, extrusion die 17, extrude sheet material from extrusion die 17 to the water tank, and enter the subsequent cooling molding, dewatering drying, dehumidification and shaping control Shrinkage rate, trimming and embossing, cooling, thickness measurement, defect detection until laminating and winding to complete the whole process of product production.

Preferably, the temperature of the cooling water interlayer on the twin-screw premixer 3 is 5-10 degrees, the temperature of the cooling water entering the cooling water interlayer on the horizontal mixer 6 is 5-15 degrees, and the water-cooled screw conveying The cooling water interlayer of the machine 9 is continuously supplied with cooling water at a temperature of 7-15 degrees, and the center of the built-in conveying screw of the water-cooled screw conveyor 9 is connected with cooling water at a temperature of 7-15 degrees.

Preferably, the extrusion rate of the single-screw extruder 11 is 200-3500 kg/h.

Preferably, the filtering precision of the screen changer 12 is 100-40um.

PVB resin powder, plasticizer and aqueous solution additives are pre-mixed by twin-screw pre-mixer 3 and horizontal mixer 6, etc. The whole process takes about 15 minutes or more, and the resin powder and liquid plasticizer are fully prepared. The absorption and uniform dispersion of the PVB film have qualitatively improved the performance of the PVB film, realizing uniform and balanced performance; at the same time, a single-screw production process is adopted, which is forced feeding, can be stably extruded, and has reliable quality. Heat is conducive to the improvement of product quality.

The undisclosed parts in the present invention are all in the prior art, and their specific structures, materials and working principles will not be described in detail. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A PVB production facility of single screw extrusion which characterized in that includes:

a resin storage bin (1);

the feed inlet of the double-screw premixer (3) is connected with the discharge outlet of the resin storage bin (1) through a weightlessness measuring system (2);

a feed inlet of the horizontal mixer (6) is connected with a discharge outlet of the double-screw premixing machine (3), and a weighing sensor (7) is arranged on the horizontal mixer (6);

the feeding port of the water-cooling screw conveyor (9) is connected with the discharging port of the horizontal mixer (6), and a discharging valve (8) is arranged on the discharging port of the horizontal mixer (6);

the feeding device comprises a forced feeding tank (10), wherein the feeding end of the forced feeding tank (10) is connected with the discharging hole of a water-cooling spiral conveyer (9);

single screw extruder (11), the feed inlet of single screw extruder (11) is connected with the discharge gate of forcing feed jar (10), the discharge gate and one-level melt pump (13) of single screw extruder (11) are connected, are provided with between single screw extruder (11) and one-level melt pump (13) and trade wire stitcher (12), one-level melt pump (13) are connected through precision filter (14) with second grade melt pump (15), and second grade melt pump (15) are connected with static mixer (16), and extrusion die head (17) is connected to static mixer (16) adapter.

2. A single screw extruded PVB manufacturing apparatus as defined in claim 1 wherein: and a plasticizer and aqueous solution injection hole (4) is formed in the double-screw premixer (3).

3. A single screw extruded PVB manufacturing apparatus as defined in claim 1 wherein: and a discharge port of the double-screw pre-mixer (3) is connected with a water-cooling connector (5).

4. A single screw extruded PVB manufacturing apparatus according to claim 1 wherein: and cooling water interlayers are arranged on the double-screw premixing machine (3) and the horizontal mixer (6).

5. A single screw extruded PVB manufacturing apparatus as defined in claim 1 wherein: and the horizontal mixer (6) is also provided with another feeding hole, and the other feeding hole of the horizontal mixer (6) is connected with a discharging hole of the cooling bin (18) through a weightlessness metering system II (19).

6. A single screw extruded PVB manufacturing apparatus as defined in claim 1 wherein: the diameter of the screw of the single-screw extruder (11) is 4.5-12 inches, and the length-diameter ratio is 30-43.

7. A PVB production process for single-screw extrusion is characterized by comprising the following steps:

PVB resin powder enters a resin storage bin (1) through a vacuum feeding system, and is accurately and continuously metered and conveyed to a double-screw premixing machine (3) through a weightlessness metering system (2), wherein the rotating speed of the double-screw premixing machine (3) is 50-200 revolutions;

continuously introducing cooling water into a cooling water interlayer of the double-screw premixer (3) to prevent the mixed resin powder from swelling;

the plasticizer and the aqueous solution are injected into the double-screw premixer (3) through a plasticizer and aqueous solution injection hole (4), and are accurately injected by a weight loss metering device in the mixing process, so that the formula proportion mixing is realized;

continuously conveying and discharging the premixed resin powder into a horizontal mixer (6);

online and offline PVB recovery chopped materials are continuously metered into the horizontal mixer (6) from the other feed inlet through a cooling bin (18) and a weight loss metering system II (19);

continuously introducing cooling water into a cooling water interlayer of the horizontal mixer (6);

the horizontal mixer (6) controls the load through a weighing sensor (7), an external controller and the like to realize the control of the conveying capacity of the double-screw premixer (3) and the cooling bin (18);

the horizontal mixer (6) keeps continuous operation, and the running speed is 20-50 revolutions;

the horizontal mixer (6) discharges materials to the inlet of a water-cooling spiral conveyer (9) through a discharging valve (8), then enters the water-cooling spiral conveyer (9), and then is conveyed to a single-screw extruder (11) through a forced feeding tank (10);

the opening of the discharging valve (8) is controlled by the material level of a storage bin of the single-screw extruder (11), and the discharging valve is opened at a low material level and closed at a high material level;

the production process comprises the steps that mixed powder (containing PVB resin powder, a plasticizer, a processing aid aqueous solution and a trimming material) enters a single-screw extruder (11) through a forced feeding screw to be plasticized and extruded, then the mixed powder sequentially passes through a screen changer (12), a primary melt pump (13), a precision filter (14), a secondary melt pump (15), a static mixer (16) and an extrusion die head (17), a sheet is extruded from the extrusion die head (17) to a water tank, and the mixed powder enters the whole process of subsequent cooling forming, dewatering and drying, dehumidifying and sizing (shrinkage control), trimming and embossing, cooling, thickness measurement and flaw detection until a film is rolled to complete the production of a product.

8. A single screw extruded PVB process of claim 7 wherein: the temperature of a cooling water interlayer on the double-screw premixing machine (3) is 5-10 degrees, the temperature of cooling water introduced into the cooling water interlayer on the horizontal mixing machine (6) is 5-15 degrees, the temperature of cooling water continuously introduced into the cooling water interlayer of the water-cooling screw conveyor (9) is 7-15 degrees, and the temperature of cooling water introduced into the center of a built-in conveying screw of the water-cooling screw conveyor (9) is 7-15 degrees.

9. A process according to claim 7 for the production of PVB by single screw extrusion, wherein: the extrusion capacity of the single-screw extruder (11) is 200-3500 kg/h.

10. A process according to claim 7 for the production of PVB by single screw extrusion, wherein: the filtering precision of the screen changer (12) is 100-40 um.

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