CN113352586B - Vacuum metal stretching roller for longitudinal stretching of film - Google Patents
Vacuum metal stretching roller for longitudinal stretching of film Download PDFInfo
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- CN113352586B CN113352586B CN202110662093.4A CN202110662093A CN113352586B CN 113352586 B CN113352586 B CN 113352586B CN 202110662093 A CN202110662093 A CN 202110662093A CN 113352586 B CN113352586 B CN 113352586B
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- partition plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
A vacuum metal stretching roller for longitudinal stretching of a film comprises a straight cylindrical roller wall, wherein a circular partition plate, a circular left circular partition plate and a circular right circular partition plate are further arranged in an inner cavity of the roller formed by surrounding the roller wall, and the right shaft head is hollow; a liquid inlet pipe extending transversely is further arranged, and a liquid outlet flow channel with a circular section is formed in a gap between the right end section of the pipe wall of the liquid inlet pipe and the right shaft head; a cylindrical inner annular wall is further arranged between the left annular partition plate and the right annular partition plate, a cylindrical outer annular wall is further arranged between the circular partition plate and the right end panel, an annular gap between the roller wall and the cylindrical outer annular wall forms an annular negative pressure cavity, and the air exhaust pipeline is communicated with the annular negative pressure cavity through the first axial gap space; the gap space between the cylindrical inner ring wall and the cylindrical outer ring wall forms a heating liquid main flow channel with a circular ring-shaped section. The invention can ensure that the temperature of the vacuum roll is uniformly distributed along the circumferential direction, and the temperature and the vacuum degree of the left end and the right end of the vacuum roll are relatively balanced.
Description
Technical Field
The invention belongs to the technical field of plastic film production and processing equipment, and particularly relates to a vacuum metal stretching roller for longitudinally stretching a film.
Background
In the production process of the plastic film, the molten material is extruded from a die and then coagulated to form a film blank, and the film blank needs to be longitudinally stretched to form a film finished product. In the longitudinal stretching process, the film blank which is just extruded and has residual heat runs through an upstream traction nip roller and a downstream traction nip roller, each pair of traction nip rollers comprises a metal traction roller and a rubber roller, the metal traction roller and the rubber pinch the film to run forwards longitudinally, and the rotating speed of the downstream traction nip roller is greater than that of the upstream traction nip roller, so that the film blank is stretched longitudinally.
The traditional traction nip roll has the following defects:
firstly, at each specific moment, the part for clamping the film is only a specific point on the circumference, but due to the reason of processing errors, the cross sections of the metal stretching roller and the rubber roller are not in fact standard circles, so that in the rotating process, the phenomenon of elliptic jumping exists, and the fluctuation of the clamping force is large;
after the longitudinal stretching process, because the surface temperature of the metal stretching roller is low, the residual heat of the film is quickly removed, so that the molecules cannot be aligned sufficiently, irregular rapid shrinkage can be generated, and various quality indexes of a finished product are influenced.
In order to solve the problems of the first aspect, a vacuum metal stretching roller is adopted, namely an air suction pipe is arranged at one end of the metal stretching roller, and a plurality of small air suction holes are formed in the surface of the roller wall of the metal stretching roller; therefore, the vacuum adsorption force can assist in sucking the film on the surface of the roller wall, so that the tension loss in the elliptical jumping process is compensated, and the fluctuation degree of longitudinal tension is reduced. However, the existing vacuum metal drawing roller has the following defects: because the exhaust tube of the vacuum roll is arranged on one side of the vacuum roll, the negative pressure in the inner cavity of the vacuum roll is gradually reduced along the axial direction, so that the adsorption force at the left end and the right end of the vacuum roll is continuously unbalanced.
In order to solve the second problem, it is conceivable to heat the metal stretching roller in two ways, namely, in the first way, a liquid flow path is used to introduce a medium such as heating oil, and in the second way, an electric heating wire is used. The heating wire has the disadvantages that the heating parts are too concentrated and fixed, so that the surface temperature of the wall of the roller is not easy to be uniformly distributed along the circumferential direction, and the regulation and control precision is low; the liquid flow channel has the advantages that the temperature can be uniformly distributed along the circumferential direction due to continuous flowing, but the temperature of media such as heating oil can be gradually reduced along the axial direction due to the fact that the liquid flows along the axial direction in the roller cavity, and the surface temperature of the left end and the surface temperature of the right end of the vacuum roller are also continuously unbalanced.
In addition, in the prior art, if the stretching roller is a vacuum roller with a gas flow channel, an electric heating wire is generally adopted when heating is needed, because the gas-liquid flow channel is arranged in the inner space of the roller cavity at the same time, the arrangement of the inner space of the roller cavity is difficult, and the phenomenon of unbalanced temperature and vacuum degree at the left end and the right end of the vacuum roller is more prominent because liquid cannot directly contact with the roller wall and the volume of the gas flow channel is small.
Disclosure of Invention
The present invention has been made to overcome the above-mentioned drawbacks, and an object of the present invention is to provide a vacuum metal drawing roll for longitudinal drawing of a film, which can uniformly distribute the temperature of the vacuum roll in the circumferential direction and make the temperatures and the vacuum degrees at the left and right ends of the vacuum roll relatively uniform.
In order to achieve the purpose, the vacuum metal stretching roller for longitudinally stretching the thin film comprises a straight cylindrical roller wall, wherein a left shaft head and an annular left end plate are arranged on the left side of the roller wall, the left shaft head and the left end plate are fixedly connected into a whole, and the peripheral edge of the left end plate is connected with the left end edge of the roller wall; the right side of the roller wall is provided with a right shaft head and a circular right end panel, the right shaft head and the right end panel are fixedly connected into a whole, and the peripheral edge of the right end panel is connected with the right end edge of the roller wall; the left shaft head is hollow and forms a transversely extending air exhaust pipeline, and the surface of the roller wall is provided with a plurality of small air suction holes;
the roller is mainly characterized in that a circular partition plate, a circular left circular partition plate and a circular right circular partition plate are further arranged in a roller cavity formed by the roller wall in an enclosing mode, and planes where the circular partition plate, the left circular partition plate and the right circular partition plate are located are perpendicular to the central axis of the roller wall; the circular partition plate is positioned on the right side of the left end panel, a first axial gap space is reserved between the circular partition plate and the left end panel, the left circular partition plate is positioned on the right side of the circular partition plate, a second axial gap space is reserved between the circular partition plate and the left end panel, the right circular partition plate is positioned on the left side of the right end panel, and a third axial gap space is reserved between the right circular partition plate and the right end panel; the diameter of the circular partition plate is smaller than the inner diameter of the roller wall, the diameter of the outer ring of the left circular partition plate is smaller than that of the circular partition plate, and the diameter of the outer ring of the right circular partition plate is larger than that of the outer ring of the left circular partition plate and smaller than that of the circular partition plate;
the right shaft head is hollow; the liquid inlet pipe is transversely extended, the outer diameter of the liquid inlet pipe is smaller than the inner diameter of the hollow part of the right shaft head, the liquid inlet pipe penetrates through the right shaft head and extends leftwards to the transverse position of the left circular baffle plate, the inner ring edge of the left circular baffle plate is connected with the left end of the pipe wall of the liquid inlet pipe, the inner ring edge of the right circular baffle plate is connected with the outer surface of the pipe wall of the right section of the liquid inlet pipe, and a gap between the right end section of the pipe wall of the liquid inlet pipe and the right shaft head forms a liquid outlet flow channel with a circular section;
a cylindrical inner annular wall is further arranged between the left annular partition plate and the right annular partition plate, the cylindrical inner annular wall has a taper with a small left side and a large right side, the left end of the cylindrical inner annular wall is connected with the outer ring edge of the left annular partition plate, and the right end of the cylindrical inner annular wall is connected with the outer ring edge of the right annular partition plate;
a cylindrical outer ring wall is further arranged between the circular partition plate and the right end panel, the cylindrical outer ring wall is also provided with a taper with a small left side and a large right side, the diameter of the right end of the cylindrical outer ring wall is smaller than the inner diameter of the roller wall, the left end of the cylindrical outer ring wall is connected with the circumferential edge of the circular partition plate, and the right end of the cylindrical outer ring wall is connected with the right end panel;
an annular gap between the roller wall and the cylindrical outer annular wall forms an annular negative pressure cavity, and the air exhaust pipeline is communicated with the annular negative pressure cavity through the first axial gap space; a gap space between the cylindrical inner ring wall and the cylindrical outer ring wall forms a heating liquid main flow channel with a circular section, the left end of the heating liquid main flow channel is communicated with the left end of the liquid inlet pipe through the second axial gap space, and the right end of the heating liquid main flow channel is communicated with the left end of the circular liquid outlet flow channel through the third axial gap space; the transverse distance between the small air suction holes on the surface of the roller wall is smaller and smaller from left to right.
Still fixedly connected with first connecting block between circular baffle and left end panel, still fixedly connected with second connecting block between circular baffle and left ring baffle, still fixedly connected with third connecting block between right ring baffle and the right-hand member panel.
The conicity of the cylindrical outer ring wall is equal to that of the cylindrical inner ring wall.
The invention has the following advantages and effects:
the roller cavity is simultaneously provided with the air exhaust flow channel and the heating liquid flow channel, so that the temperature of the surface of the roller wall of the vacuum metal stretching roller after being heated is uniformly distributed along the circumferential direction, and the cylindrical outer ring wall is also provided with the taper with the small left side and the large right side, namely the heating liquid flow channel is closer to the roller wall of the vacuum roller from left to right, so that the influence factors of the heating liquid temperature which is lower from left to right can be offset, and the surface temperature of the vacuum metal stretching roller is relatively uniform from left to right; on the other hand, the transverse distance between the small air suction holes on the surface of the roller wall is smaller and smaller from left to right, namely the small air suction holes are denser and denser from left to right, so that the influence factor that the vacuum degree of the inner cavity of the vacuum roller is lower and lower from left to right is offset, and the adsorption force of the left end and the right end of the vacuum roller on the film is more balanced.
Drawings
Fig. 1 is a schematic diagram of the internal structure of an embodiment of the present invention.
Fig. 2 is a schematic sectional view taken along line a-a in fig. 1.
Fig. 3 is a schematic sectional view of B-B in fig. 1.
Fig. 4 is a schematic cross-sectional view of C-C in fig. 1.
Fig. 5 is a schematic cross-sectional view taken along line D-D in fig. 1.
Fig. 6 is a schematic cross-sectional view E-E of fig. 1.
Fig. 7 is a schematic view of the flow paths of gas and liquid in use of the structure shown in fig. 1.
Detailed Description
The vacuum metal stretching roller for longitudinally stretching the film shown in fig. 1 and 5 comprises a straight cylindrical roller wall 11, wherein a left shaft head 21 and a circular ring-shaped left end plate 31 are arranged on the left side of the roller wall 11, the left shaft head 21 and the left end plate 31 are fixedly connected into a whole, and the outer peripheral edge of the left end plate 31 is connected with the left end edge of the roller wall 11; the right side of the roller wall 11 is provided with a right shaft head 22 and a circular right end panel 32, the right shaft head 22 and the right end panel 32 are fixedly connected into a whole, and the peripheral edge of the right end panel 32 is connected with the right end edge of the roller wall 11; the left spindle nose 21 is hollow and forms a transversely extending air suction pipeline 41, and the surface of the roller wall 11 is provided with a plurality of small air suction holes 43.
As shown in fig. 1, 2, 3, 4 and 5, a circular partition plate 71, a circular left circular partition plate 72 and a circular right circular partition plate 73 are further arranged in a roller cavity formed by the roller wall 11 in an enclosing manner, and planes of the circular partition plate 71, the left circular partition plate 72 and the right circular partition plate 73 are perpendicular to the central axis of the roller wall 1; the circular partition plate 71 is positioned on the right side of the left end panel 31, a first axial gap space 81 is reserved between the circular partition plate 71 and the circular partition plate, the left circular partition plate 72 is positioned on the right side of the circular partition plate 71, a second axial gap space 82 is reserved between the circular partition plate and the circular partition plate, and the right circular partition plate 73 is positioned on the left side of the right end panel 32, and a third axial gap space 83 is reserved between the circular partition plate and the circular partition plate; the diameter of the circular partition plate 71 is smaller than the inner diameter of the roller wall 11, the outer ring diameter of the left circular partition plate 72 is smaller than that of the circular partition plate 71, and the outer ring diameter of the right circular partition plate 73 is larger than that of the left circular partition plate 72 and smaller than that of the circular partition plate 1; the right shaft head 22 is hollow, a transversely extending liquid inlet pipe 51 is further arranged, the outer diameter of the liquid inlet pipe 51 is smaller than the inner diameter of the hollow part of the right shaft head 22, the liquid inlet pipe 51 penetrates through the right shaft head 22 and extends leftwards to the transverse position of the left annular partition plate 72, the inner annular edge of the left annular partition plate 72 is connected with the left end of the pipe wall of the liquid inlet pipe 51, the inner annular edge of the right annular partition plate 73 is connected with the outer surface of the pipe wall of the right section of the liquid inlet pipe 51, and a gap between the right end section of the pipe wall of the liquid inlet pipe 51 and the right shaft head 22 is formed into a liquid outlet flow passage 53 with a circular section, as shown in fig. 1 and 6;
as shown in fig. 1, a cylindrical inner annular wall 13 is further disposed between the left annular partition plate 72 and the right annular partition plate 73, the cylindrical inner annular wall 13 has a taper with a small left side and a large right side, the left end of the cylindrical inner annular wall 13 is connected to the outer annular edge of the left annular partition plate 72, and the right end of the cylindrical inner annular wall 13 is connected to the outer annular edge of the right annular partition plate 73;
a cylindrical outer ring wall 12 is further arranged between the circular partition plate 71 and the right end panel 32, the cylindrical outer ring wall 12 is also provided with a taper with a small left side and a large right side, the taper of the cylindrical outer ring wall 12 is equal to that of the cylindrical inner ring wall 13, the diameter of the right end of the cylindrical outer ring wall 12 is smaller than the inner diameter of the roller wall 11, the left end of the cylindrical outer ring wall 12 is connected with the circumferential edge of the circular partition plate 71, and the right end of the cylindrical outer ring wall 12 is connected with the right end panel 32;
as shown in fig. 1, 2, 3, 4 and 5, the annular gap between the roller tube wall 11 and the tubular outer annular wall 12 is formed as an annular negative pressure chamber 42, and the air-extracting duct 41 and the annular negative pressure chamber 42 are communicated with each other through the first axial gap space 81;
the gap space between the cylindrical inner annular wall 72 and the cylindrical outer annular wall 73 is formed as a heating liquid main flow channel 52 with a circular cross section, the left end of the heating liquid main flow channel 53 is communicated with the left end of the liquid inlet pipe 51 through the second axial gap space 82, and the right end of the heating liquid main flow channel 52 is communicated with the left end of the circular liquid outlet flow channel 53 through the third axial gap space 83; the transverse spacing of the air suction holes 43 on the surface of the roller wall 11 is smaller from left to right, and the air suction holes on the surface of the roller wall 11 are denser from left to right.
As shown in fig. 1, a first connecting block 91 is further fixedly connected between the circular partition plate 71 and the left end panel 3, a second connecting block 92 is further fixedly connected between the circular partition plate 71 and the left ring partition plate 72, and a third connecting block 93 is further fixedly connected between the right ring partition plate 73 and the right end panel 32.
In the use process of the above embodiment, the film bypasses the roller wall 11, the hot oil enters from the right end of the liquid inlet pipe 51 and flows leftwards, then flows to the left end of the main heating liquid channel 52 through the second axial gap space 82, flows rightwards in the main heating liquid channel 52, transfers heat to the roller wall 11 in a radiation and convection manner, further heats the film, then the liquid in the main heating liquid channel 52 flows through the third axial gap space 83, and finally flows out through the liquid outlet channel 53, as shown by the arrow in fig. 7; on the other hand, the external suction machine sucks air into the annular negative pressure chamber 42 through the suction pipe 41 and the first axial gap space 81, and as shown by an arrow in fig. 7, the annular negative pressure chamber 42 is made negative in pressure and the film is sucked through the suction small hole 43.
Claims (3)
1. A vacuum metal stretching roller for longitudinally stretching a film comprises a straight cylindrical roller wall, wherein a left shaft head and an annular left end plate are arranged on the left side of the roller wall, the left shaft head and the left end plate are fixedly connected into a whole, and the peripheral edge of the left end plate is connected with the left end edge of the roller wall; the right side of the roller wall is provided with a right shaft head and a circular right end panel, the right shaft head and the right end panel are fixedly connected into a whole, and the peripheral edge of the right end panel is connected with the right end edge of the roller wall; the left shaft head is hollow and forms a transversely extending air exhaust pipeline, and the surface of the roller wall is provided with a plurality of small air suction holes;
the method is characterized in that: a circular partition plate, a circular left circular partition plate and a circular right circular partition plate are further arranged in a roller inner cavity formed by the roller wall in an enclosing mode, and planes where the circular partition plate, the left circular partition plate and the right circular partition plate are located are perpendicular to the central axis of the roller wall; the circular partition plate is positioned on the right side of the left end panel, a first axial gap space is reserved between the circular partition plate and the left end panel, the left circular partition plate is positioned on the right side of the circular partition plate, a second axial gap space is reserved between the circular partition plate and the left end panel, the right circular partition plate is positioned on the left side of the right end panel, and a third axial gap space is reserved between the right circular partition plate and the right end panel; the diameter of the circular partition plate is smaller than the inner diameter of the roller wall, the diameter of the outer ring of the left circular partition plate is smaller than that of the circular partition plate, and the diameter of the outer ring of the right circular partition plate is larger than that of the outer ring of the left circular partition plate and smaller than that of the circular partition plate;
the liquid inlet pipe penetrates through the right shaft head and extends leftwards to the transverse position of the left circular partition plate, the inner ring edge of the left circular partition plate is connected with the left end of the pipe wall of the liquid inlet pipe, the inner ring edge of the right circular partition plate is connected with the outer surface of the pipe wall of the right section of the liquid inlet pipe, and a liquid outlet flow passage with a circular section is formed in a gap between the right end section of the pipe wall of the liquid inlet pipe and the right shaft head;
a cylindrical inner annular wall is further arranged between the left annular partition plate and the right annular partition plate, the cylindrical inner annular wall has a taper with a small left side and a large right side, the left end of the cylindrical inner annular wall is connected with the outer annular edge of the left annular partition plate, and the right end of the cylindrical inner annular wall is connected with the outer annular edge of the right annular partition plate;
a cylindrical outer ring wall is further arranged between the circular partition plate and the right end panel, the cylindrical outer ring wall is also provided with a taper with a small left side and a large right side, the diameter of the right end of the cylindrical outer ring wall is smaller than the inner diameter of the roller wall, the left end of the cylindrical outer ring wall is connected with the circumferential edge of the circular partition plate, and the right end of the cylindrical outer ring wall is connected with the right end panel;
an annular gap between the roller wall and the cylindrical outer annular wall forms an annular negative pressure cavity, and the air exhaust pipeline is communicated with the annular negative pressure cavity through the first axial gap space; the gap space between the cylindrical inner ring wall and the cylindrical outer ring wall forms a heating liquid main flow channel with a circular section, the left end of the heating liquid main flow channel is communicated with the left end of the liquid inlet pipe through the second axial gap space, and the right end of the heating liquid main flow channel is communicated with the left end of the circular liquid outlet flow channel through the third axial gap space; the transverse distance between the small air suction holes on the surface of the roller wall is smaller and smaller from left to right.
2. The vacuum metal draw roll of claim 1, wherein: the connecting structure comprises a circular partition plate, a left end panel, a right end panel, a first connecting block, a second connecting block, a third connecting block and a third connecting block, wherein the first connecting block is fixedly connected between the circular partition plate and the left end panel, the second connecting block is fixedly connected between the circular partition plate and the left ring partition plate, and the third connecting block is fixedly connected between the right ring partition plate and the right end panel.
3. The vacuum metal stretching roll for film longitudinal stretching according to claim 1, characterized in that: the taper of the cylindrical outer annular wall is equal to the taper of the cylindrical inner annular wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110662093.4A CN113352586B (en) | 2021-06-15 | 2021-06-15 | Vacuum metal stretching roller for longitudinal stretching of film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110662093.4A CN113352586B (en) | 2021-06-15 | 2021-06-15 | Vacuum metal stretching roller for longitudinal stretching of film |
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| CN113352586A CN113352586A (en) | 2021-09-07 |
| CN113352586B true CN113352586B (en) | 2022-08-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113904059A (en) * | 2021-09-26 | 2022-01-07 | 上海恩捷新材料科技有限公司 | High-pore-uniformity microporous membrane, preparation method thereof and battery |
| CN113954341B (en) * | 2021-11-03 | 2023-06-02 | 宁波勤邦新材料科技有限公司 | Forming stretching equipment for solar backboard base film |
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2021
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| JP2008074530A (en) * | 2006-09-20 | 2008-04-03 | Nidec Copal Corp | Film feed roller |
| TW200848246A (en) * | 2007-06-11 | 2008-12-16 | Perfection Mighty Ind Co Ltd | Method of forming patterns on facial mask by vacuum absorption |
| JP2009154946A (en) * | 2007-12-27 | 2009-07-16 | Sharp Corp | Sticking tool |
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