CN218857474U - Cast piece roller component - Google Patents
Cast piece roller component Download PDFInfo
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- CN218857474U CN218857474U CN202223158996.8U CN202223158996U CN218857474U CN 218857474 U CN218857474 U CN 218857474U CN 202223158996 U CN202223158996 U CN 202223158996U CN 218857474 U CN218857474 U CN 218857474U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The utility model discloses a cast sheet roller component, which comprises a cast sheet roller with a circulating cooling water channel inside; the outer side of the casting sheet roller is coaxially provided with an arc-shaped cover with a circulating water cooling channel inside; a channel for enabling a casting sheet to pass is formed between the arc-shaped cover and the casting sheet roller; and an oil discharge hole penetrating through the arc cover is formed in the bottom of the arc cover. The utility model discloses set up inside cast piece roller and the arc cover that has recirculated cooling water passageway, can improve the cooling rate of cast piece and the homogeneity of two-sided cooling effect to a certain extent to be favorable to improving polyolefin microporous membrane product property ability and improving production speed.
Description
Technical Field
The utility model belongs to the technical field of lithium battery diaphragm production technique and specifically relates to a cast piece roller assembly is related to.
Background
Polyethylene (PE) microporous membranes are widely applied to the fields of clothing, sewage treatment, medical supplies, battery diaphragms and the like due to the outstanding advantages of chemical corrosion resistance, good mechanical properties, low production cost and the like. Particularly, under the condition of rapid development of the current new energy industry, the PE microporous diaphragm which is one of the key components of the lithium battery increasingly and obviously solves the problems of insufficient capacity and performance to be further improved. The PE microporous membrane is mainly produced by a wet process, and comprises the working procedures of melt extrusion of PE/pore-foaming agent Liquid Paraffin (LP), sheet casting, longitudinal stretching, transverse stretching, extraction, heat treatment and the like. The casting sheet is the first step after the melt is extruded from the head, and aims to make the high temperature melt cool and set quickly and produce solid-liquid phase separation to form gel film sheet. The cooling of the melt and the cast sheet must be as rapid as possible to reduce the crystallinity of PE while shaping, otherwise, a series of problems such as uneven surface of the film, poor roller adhesion, stretching and film breaking can be caused, and the production speed and the product quality are reduced.
The mainstream cast sheet method in the industry at present is a casting method, namely, one surface (roll attaching surface) of a melt and a cast sheet is attached to a low-temperature (less than 20 ℃) cold roll with circulating cooling water, while the other surface (air surface) is contacted with air (less than 50 ℃) and mainly depends on the heat dissipation and temperature reduction of the cold roll on the single surface. Because the temperature of the air side is high and the thermal conductivity of air is much lower than that of the metal chill roll, not only is the overall cooling rate of the cast slab limited, but the cooling rates on both sides of the cast slab are also inconsistent. The former causes an excessively high crystallinity of the cast sheet, and the latter causes a non-uniform structure in the thickness direction of the cast sheet, which makes the sheet susceptible to various defects such as warpage.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the lower problem of cast piece production performance and production efficiency to prior art, and provide a cast piece subassembly.
The technical scheme of the utility model is that: a casting roll assembly includes a casting roll having a circulating cooling water passage therein; the outer side of the casting sheet roller is coaxially provided with an arc-shaped cover with a circulating water cooling channel inside; a channel for enabling a casting sheet to pass is formed between the arc-shaped cover and the casting sheet roller; and an oil discharge hole penetrating through the arc cover is formed in the bottom of the arc cover.
The distance between the inner surface of the arc-shaped cover and the casting sheet is 2-5mm.
And the wrap angle a of the arc-shaped cover is more than or equal to that of the cast sheet.
The vertex of the arc cover is M; the right side point of the arc-shaped cover is N; the M is located to the right of N in the horizontal direction, and M is located above N.
And two end surfaces of the arc-shaped cover are flush with two ends of the cast sheet roller.
The length of the oil discharge hole is larger than that of the cast piece.
The width of the oil discharge hole is 2-6mm.
The arc cover is made of stainless steel.
By adopting the technical scheme, the utility model discloses following beneficial effect has: (1) The utility model discloses set up inside cast piece roller and the arc cover that has recirculated cooling water passageway, can improve the cooling rate of casting the piece and the homogeneity of two-sided cooling effect to a certain extent to be favorable to improving polyolefin microporous membrane product property ability and improving production speed.
(2) The distance between the inner surface of the arc cover and the casting sheet is 2-5mm, so that the arc cover can be close to the casting sheet as much as possible, the thickness of an air layer is reduced, and the heat on the surface of the casting sheet is transferred to the arc cover as soon as possible.
(3) The utility model discloses a cornerite a more than or equal to of arc cover casts the cornerite of piece, can increase the heat transfer area of arc cover to the radiating effect to the cast piece has been improved.
(4) The utility model discloses a M lies in the right side of N on the horizontal direction to M lies in the top of N, and with the pore-forming agent condensate drop that prevents M point department falls on the air face of casting the piece and leads to the defect.
(5) The utility model discloses a both ends face and the both ends of casting the piece roller of arc cover flush, have further improved the radiating effect to casting the piece.
(6) The utility model discloses a length of oil drain hole is greater than the length of casting the piece, can effectively prevent remaining of porogenic agent condensate.
(7) The width of the oil discharge hole of the utility model is 2-6mm, and the oil discharge effect is better.
(8) The utility model discloses a material of arc cover is the stainless steel, has further improved the radiating effect of arc cover to the casting piece.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the figures are:
a casting sheet roller 1 and an arc-shaped cover 2.
Detailed Description
(example 1)
Referring to fig. 1, a cast strip roll assembly of the present embodiment includes a cast strip roll 1 having a passage for circulating cooling water therein; the outer side of the casting sheet roller 1 is coaxially provided with an arc-shaped cover 2 with a circulating water cooling channel inside; a channel for allowing the casting sheet to pass is formed between the arc-shaped cover 2 and the casting sheet roller 1; the bottom of the arc cover 2 is provided with an oil discharge hole which penetrates through the arc cover 2.
Furthermore, the distance between the inner surface of the arc cover 2 and the casting sheet is 2-5mm, so that the arc cover 2 can be close to the casting sheet as much as possible, the thickness of an air layer is reduced, and heat on the surface of the casting sheet is transferred to the arc cover 2 as soon as possible.
Furthermore, the wrap angle a of the arc-shaped cover 2 is larger than or equal to that of the cast sheet, so that the heat transfer area of the arc-shaped cover 2 can be increased, and the heat dissipation effect on the cast sheet is improved.
Furthermore, the vertex of the arc-shaped cover 2 is M; the right side point of the arc-shaped cover 2 is N; the M is positioned at the right side of the N in the horizontal direction, and the M is positioned above the N, so that the porogenic agent condensate at the point M is prevented from falling on the air surface of the casting sheet to cause defects.
Furthermore, two end faces of the arc-shaped cover 2 are flush with two ends of the cast sheet roller 1, so that the heat dissipation effect of the cast sheet is further improved.
Furthermore, the length of the oil discharge hole is larger than that of the casting sheet, so that the residue of condensed liquid of the pore-foaming agent can be effectively prevented.
Furthermore, the width of the oil discharge hole is 2-6mm, and the oil discharge effect is good.
Preferably, the arc cover 2 is made of stainless steel, so that the heat dissipation effect of the arc cover 2 on the cast sheet is further improved.
In the embodiment, polyethylene powder (with a weight average molecular weight of 100 ten thousand) and pore-forming agent liquid paraffin (white oil) are mixed and melted in a twin-screw extruder according to a feeding proportion of a mass ratio of 3 to 7, the melt is extruded from a machine head to a casting sheet roller 1, and the mixture is cooled and shaped to form a casting sheet with a thickness of 1 mm. An arc-shaped cover 2 is used below the casting sheet roller 1, the wrap angle of the arc-shaped cover is equal to that of the casting sheet, the left side and the right side of the arc-shaped cover are flush with the casting sheet roller 1, and the gap between the arc-shaped cover and the casting sheet is 3mm. The length a of the oil drain hole below the arc-shaped cover 2 is about 6mm more than the width of the cast piece, and the width of the oil drain hole is 4mm. The casting roller 1 and the arc-shaped cover 2 are internally provided with circulating cooling water at the temperature of 15 ℃. And sequentially carrying out longitudinal stretching, primary transverse stretching, extraction, drying and secondary transverse stretching, and finally rolling to obtain a PE microporous membrane finished product, wherein the rolling speed is 55m/min.
Comparative example 1, the same as in example 1, except that the arc cover 2 was not used, the take-up speed was 55m/min. Otherwise, all other production process conditions and the use of the arc hood 2 were exactly the same as in example 1.
(example 2)
The take-up speed in example 2 was 60m/min, except that all other production process conditions and the use of the arc hood 2 were exactly the same as in example 1.
Comparative example 2, the winding speed was 60m/min, the same as in example 2, without using the arc cover 2. Otherwise, all other production process conditions and the use of the arc hood 2 were exactly the same as in examples 1 and 2.
The data for example 1, example 2, comparative example 1 and comparative example 2 were statistically collected as shown in the following table:
as can be seen from the table: the MD tensile strength, TD tensile strength and puncture strength of the example microporous membrane sample using the arcuate hood 2 were all higher than the comparative example sample without the cooling hood at the same take-up speed; when the take-up speed was increased, the mechanical strength of the high-speed production sample using the cooling jacket (example 2) was not lower than that of the low-speed production sample not using the cooling jacket (comparative example 1), although the mechanical strength of all the PE microporous films was decreased. As explained above, the use of the arc-shaped cover 2 is advantageous for improving the performance and increasing the production speed of the polyolefin microporous membrane product.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A cast sheet roll assembly characterized by: comprises a casting sheet roller (1) with a cooling water circulating channel inside; an arc-shaped cover (2) with a circulating water cooling channel inside is coaxially arranged on the outer side of the casting sheet roller (1); a channel for allowing the casting sheet to pass is formed between the arc-shaped cover (2) and the casting sheet roller (1); and an oil discharge hole penetrating through the arc cover (2) is formed in the bottom of the arc cover (2).
2. A blade roll assembly according to claim 1 wherein: the distance between the inner surface of the arc-shaped cover (2) and the casting sheet is 2-5mm.
3. A blade roll assembly according to claim 1 wherein: the wrap angle a of the arc-shaped cover (2) is more than or equal to that of the cast sheet.
4. A blade roll assembly according to claim 1 wherein: the vertex of the arc cover (2) is M; the right side point of the arc cover (2) is N; the M is located on the right side of N in the horizontal direction, and the M is located above N.
5. A blade roll assembly according to claim 1 wherein: the two end faces of the arc-shaped cover (2) are flush with the two ends of the cast sheet roller (1).
6. A blade roll assembly according to claim 1 wherein: the length of the oil discharge hole is larger than that of the cast piece.
7. The blade roll assembly of claim 1, wherein: the width of the oil discharge hole is 2-6mm.
8. A blade roll assembly according to claim 1 wherein: the arc cover (2) is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223158996.8U CN218857474U (en) | 2022-11-28 | 2022-11-28 | Cast piece roller component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223158996.8U CN218857474U (en) | 2022-11-28 | 2022-11-28 | Cast piece roller component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218857474U true CN218857474U (en) | 2023-04-14 |
Family
ID=87350409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223158996.8U Active CN218857474U (en) | 2022-11-28 | 2022-11-28 | Cast piece roller component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218857474U (en) |
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2022
- 2022-11-28 CN CN202223158996.8U patent/CN218857474U/en active Active
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