CN215619866U - Solar cell packaging film extruder screw - Google Patents

Abstract

The utility model discloses a solar cell packaging film extruder screw, which comprises an extrusion screw rib positioned on a screw body, wherein the extrusion screw rib extends from a feeding section to a homogenizing section through a melting section, the screw body corresponding to the melting section is also provided with a melting screw rib, the ratio T1/T = (1.06-1.08) of the melting pitch T1 of the melting screw rib and the extrusion pitch T of the extrusion screw rib is 1, the bottom diameter D3 of a melting groove on the screw body is greater than the diameter D2 of the melting screw and less than the top diameter D4 of the melting screw rib, the top diameter D4 of the melting screw rib is less than the top diameter D5 of the extrusion screw rib, and the width S of the extrusion screw rib is greater than the width S1 of the melting screw rib; the central point of screw rod body puts and is provided with the screw rod chamber of leading to water, and this screw rod chamber of leading to water is blind hole structure, leads to the intracavity at the screw rod and is provided with the raceway, and the interval is provided with a plurality of water conservancy diversion spiral pieces on this raceway. The extruder screw rod can effectively control the extrusion working temperature, avoid the fluctuation of the working temperature and form strong shearing and mixing effects on materials.

Description

Solar cell packaging film extruder screw

Technical Field

The utility model relates to screw extruder equipment, in particular to improvement of a screw structure of a screw extruder for extruding a solar cell packaging film into a film.

Background

The screw extruder is a mechanical device for melting and plasticizing high polymer materials such as EVA/POE and the like to form uniform melt in the production of the solar cell module packaging film. In order to improve the extrusion quality of semi-finished adhesive films, besides selecting a proper screw extruder configuration, screw geometric parameters, feeding devices and a head runner on equipment, the heating temperature of each section of the screw extruder is particularly important for the adhesive film quality in the aspect of extrusion process conditions. Reasonable heating temperature can improve the plasticizing effect of the rubber material, and excessive extrusion temperature can not be caused. The method adopts the traditional forced cooling method, the temperature of the extruded semi-finished product is high and the semi-finished product is half-cooked (bad plasticization), in order to reduce the extrusion temperature, chilled water with zero degree of centigrade or even lower is used, but as the viscosity and hardness of the rubber material of the extrusion system are high under the condition of low temperature, strong shearing is generated between the rubber material and a screw rod and a machine barrel, and strong internal friction is generated between the rubber material and the rubber material, so that the temperature is increased; meanwhile, the high-viscosity rubber material is difficult to flow and mix in an extrusion system, so that the plasticizing is not uniform, the temperature cannot be reduced, but is higher, irregular paste is generated in an extruded material, the extrusion process is seriously disabled, and the quality problem of a semi-finished product of a cold feeding extruder is serious. The precise constant control of the working temperature of the extruder is the guarantee of the mixing capability, the dispersive mixing efficiency and the extrusion stability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a solar cell packaging film extruder screw which can effectively control the working temperature of an extrusion screw and can form strong shearing and mixing effects on materials.

In order to solve the technical problem, the screw of the solar cell packaging film extruder comprises a screw body, wherein a feeding section, a melting section, a homogenizing section and a mixing section are sequentially arranged on the screw body, an extrusion screw rib positioned on the screw body extends from the feeding section to the homogenizing section through the melting section, a melting screw rib is also arranged on the screw body corresponding to the melting section, the ratio T1/T = (1.06-1.08) = (1.3532) of the melting screw pitch T1 of the melting screw rib to the extrusion screw pitch T of the extrusion screw rib (1), the bottom diameter D3 of a melting groove on the screw body is larger than the diameter D2 of the melting screw and smaller than the top diameter D4 of the melting screw rib, the top diameter D4 of the melting screw rib is smaller than the top diameter D5 of the extrusion screw rib, and the width S of the extrusion screw rib is larger than the width S1 of the melting screw rib; the screw rod body is provided with a screw rod water through cavity at the central position, the screw rod water through cavity is of a blind hole structure, a water delivery pipe is arranged in the screw rod water through cavity, and a plurality of flow guide spiral sheets are arranged on the water delivery pipe at intervals.

In the extruder screw, the feeding section, the melting section, the homogenizing section and the mixing section are sequentially arranged on the screw body; the screw body is provided with a melting screw edge, when the materials of the melting structure and the solid particles of the body melt through the melting screw edge, the materials are in vortex-shaped circulation, so that the materials are subjected to strong shearing action, the mixing action is further enhanced, the tail end of the screw body is also provided with a mixing section, and the materials in the melting state are mixed intensively again, so that the effect of mixing action is further improved and enhanced.

The ratio T1/T of the melting pitch T1 of the melting ribs to the extrusion pitch T of the extrusion ribs is controlled within the proportion range of (1.06-1.08): 1, the pitch difference between the extrusion ribs and the melting ribs continuously increases and changes the reflux and swirl proportion of the molten material and the unmelted solid material between the ribs, the reflux effect is enhanced, and the mixing effect is fully enhanced; the reasonable T1/T ratio fully ensures the mixing effect in the melting stage; the bottom diameter D3 of the melting tank is larger than the diameter D2 of the melting screw and smaller than the diameter D4 of the melting ridge, and the diameter D4 of the melting ridge top is smaller than the diameter D5 of the extruding ridge top, so that the residence time of the materials in the melting screw section is increased, the shearing effect and the dispersing and mixing effect are enhanced, and the extrusion effect on the materials is gradually enhanced.

The screw rod water cavity of blind hole structure is put at screw rod body central point, the screw rod leads to the intracavity and is provided with the raceway, the interval is provided with a plurality of water conservancy diversion flights on the raceway, be provided with logical water cavity and raceway at the screw rod body, screw rod accuse temperature conditioning rivers backward flow passageway has been formed, the regulation and control to the screw rod temperature has more been reinforceed, water conservancy diversion flight on the raceway, the route and the time of the conduction heat of rivers with the screw rod body have been strengthened, more be favorable to the regulation and control to screw rod body temperature, spiral water cavity and spiral water course on the feed cylinder and the water passage combined action on the screw rod, make the operating temperature of extruder obtain very accurate invariable control, effectively guaranteed the quality of extruding sizing material semi-manufactured goods.

In a preferred embodiment of the utility model, the screw body is of a split structure, the diameter D1 of the feeding section of the screw body is equal to the diameter D2 of the melting section of the screw, and the diameter D6 of the homogenizing section of the screw body is greater than the diameter D2 of the melting section of the screw. The ratio of the melting pitch T1 to the extrusion pitch T, T1/T =1.07: 1. The ratio of the melt flight width S1 to the extrusion flight width S, S1/S = (0.50-0.65) = (1). Is beneficial to improving the mixing and dispersing effect of the screw and generates stronger melt mixing flow.

In a preferred embodiment of the present invention, the rotation directions of the adjacent guide spiral pieces are the same or opposite. Is favorable for strengthening the heat transfer between the water flow and the screw.

In a preferred embodiment of the present invention, the kneading segment includes a screw body and kneading pins provided on the screw body. Further, the melt is subjected to intensive mixing.

Drawings

The solar cell packaging film extruder screw of the utility model is further explained with reference to the drawings and the detailed description.

FIG. 1 is a schematic structural diagram of the profile of one embodiment of the extruder screw with solar cell packaging film of the present invention;

FIG. 2 is a schematic cross-sectional view of the extrusion screw of FIG. 1;

FIG. 3 is a schematic structural view of the water duct of FIG. 2;

FIG. 4 is an enlarged schematic view of the feed block extrusion screw of FIG. 2;

FIG. 5 is an enlarged schematic view of the melt segment extrusion screw of FIG. 2;

FIG. 6 is an enlarged schematic view of the homogenizing section and kneading section extrusion screws of FIG. 2.

In the figure, 1-extrusion screw ridge, 2-melting screw ridge, 3-screw body, 4-water delivery pipe, 5-diversion screw blade, 6-screw water through cavity and 7-mixing convex nail;

a, a feeding section, B, a melting section, C, a homogenizing section and D, a mixing section.

Detailed Description

The screw of the extruder shown in fig. 1 and 2 comprises a screw body 3, and a feeding section A, a melting section B, a homogenizing section C and a mixing section D are arranged on the screw body 3 in sequence from the screw driving end to the material extruding end. The extrusion flight 1 on the screw body 3 extends from the feed section a through the melting section B to the homogenization section C. The central point of screw body 3 puts and is provided with screw rod chamber 6 that leads to water, and screw rod chamber 6 that leads to water is the blind hole structure, is provided with raceway 4 in screw rod chamber 6 that leads to water, forms the return water passageway between the inner chamber wall of screw rod chamber 6 and the outer pipe wall of raceway 4, and the cooling water is delivered to screw rod chamber 6 that leads to water through raceway 4, and the return water passageway through screw rod chamber 6 that leads to water flows out again. The screw body 3 is formed by screwing a plurality of sections by screw threads.

As shown in fig. 3, a plurality of flow guiding spiral sheets 5 are equidistantly installed on the outer wall of the water pipe 4, the outer diameter of the flow guiding spiral sheets 5 is smaller than the inner diameter of the screw water through cavity 6, and the spiral directions of the flow guiding spiral sheets 6 are the same. In order to improve the heat conduction effect of the cooling water in the cavity of the screw water through cavity 6, the rotation directions of the adjacent guide spiral pieces 6 can be opposite.

As shown in fig. 4, the water pipe 4 in the screw water passing cavity 6 of the feeding section extrusion screw and the guide spiral plate 5 positioned on the water pipe 4 are provided with an extrusion screw rib 1 with an extrusion screw pitch T on the outer side surface of the screw body 3, the extrusion screw rib width of the extrusion screw rib 1 is S, and the diameter of the feeding screw is D1.

As shown in fig. 5, in the screw water through cavity 6 of the melting section extrusion screw, a water pipe 4 and a flow guiding spiral sheet 5 thereon are also arranged, an extrusion screw rib 1 and a melting screw rib 2 with the same rotation direction are arranged on the screw body 3, the ratio of the melting pitch T1 of the melting screw rib 2 to the extrusion pitch T of the extrusion screw rib 1 is T1/T =1.07:1, the pitch ratio T1/T is controlled between (1.06-1.08): 1, so as to obtain the best extrusion, shearing and mixing effects, the melting tank bottom diameter D3 on the screw body 3 is larger than the melting screw diameter D2 and smaller than the melting screw rib top diameter D4, the melting screw rib top diameter D4 is also smaller than the extrusion screw rib top diameter D5, and the extrusion screw rib width S is larger than the melting screw rib width S1.

As shown in fig. 6, the screw water passage chamber 6 of the core of the screw body 3 extends from the feeding section a, the melting section B and the homogenizing section C to a position inside the end of the kneading section D, thereby forming a blind hole, and the extrusion flight 1 on the screw body 3 extends to the homogenizing section C. The outer diameter of the screw body 3 of the mixing section D is smaller than that of the screw body 3 of the homogenizing section C. A plurality of mixing convex nails 7 arranged along the radial direction are arranged on the screw body 3 of the mixing section D, and the diameter of the cylindrical surface where the nail tops of the mixing convex nails 7 are positioned is smaller than the diameter of the inner cylinder of the screw water through cavity 6.

Claims (6)

1. The utility model provides a solar cell packaging film extruder screw rod, includes screw rod body (3), its characterized in that: a feeding section (A), a melting section (B), a homogenizing section (C) and a mixing section (D) are sequentially arranged on a screw body (3), an extrusion screw rib (1) positioned on the screw body (3) extends from the feeding section (A) to the homogenizing section (C) through the melting section (B), a melting screw rib (2) is further arranged on the screw body (3) corresponding to the melting section (B), the ratio T1/T = (1.06-1.08) of the melting screw pitch T1 of the melting screw rib (2) to the extrusion screw pitch T of the extrusion screw rib (1) is 1, the bottom diameter D3 of a melting groove on the screw body (3) is larger than the diameter D2 of the melting screw and smaller than the top diameter D4 of the melting screw rib, the top diameter D4 of the melting screw rib is smaller than the top diameter D5 of the extrusion screw rib, and the width S of the extrusion screw rib is larger than the width S1; the screw rod body is characterized in that a screw rod water passing cavity (6) is arranged in the center of the screw rod body (3), the screw rod water passing cavity (6) is of a blind hole structure, a water conveying pipe (4) is arranged in the screw rod water passing cavity (6), and a plurality of flow guide spiral sheets (5) are arranged on the water conveying pipe (4) at intervals.

2. The solar cell encapsulation film extruder screw of claim 1, wherein: the screw body (3) adopts a split structure, the diameter D1 of the feeding screw of the feeding section (A) on the screw body (3) is equal to the diameter D2 of the melting section screw, and the diameter D6 of the homogenizing section (C) is larger than the diameter D2 of the melting section screw.

3. The solar cell encapsulation film extruder screw of claim 1, wherein: the ratio of the melting pitch T1 to the extrusion pitch T, T1/T =1.07: 1.

4. The solar cell encapsulation film extruder screw of claim 1, wherein: the ratio of the melt flight width S1 to the extrusion flight width S, S1/S = (0.50-0.65) = (1).

5. The solar cell encapsulation film extruder screw of claim 1, wherein: the rotating directions of the adjacent guide spiral sheets (5) are the same or opposite.

6. The solar cell encapsulation film extruder screw of claim 1, wherein: the mixing section (D) comprises a screw body (3) and mixing convex nails (7) arranged on the screw body (3).

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