CN215320787U - Online annealing and stretching treatment device for blown film - Google Patents
Online annealing and stretching treatment device for blown film Download PDFInfo
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- CN215320787U CN215320787U CN202022350579.8U CN202022350579U CN215320787U CN 215320787 U CN215320787 U CN 215320787U CN 202022350579 U CN202022350579 U CN 202022350579U CN 215320787 U CN215320787 U CN 215320787U
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Abstract
The utility model relates to a blown film on-line annealing and stretching treatment device, which comprises a preheating oven, a preheating roller set and a cooling roller set; the temperature in the preheating oven is set to be lower than 80 ℃; a preheating roller set and a cooling roller set are arranged behind the preheating oven; a plurality of preheating rollers are arranged in the preheating roller group; a plurality of cooling rollers are arranged in the cooling roller group; the thin film alternately passes through the preheating roller and the cooling roller; the temperature difference between the preheating roller and the cooling roller is more than 50 ℃. The utility model arranges a special annealing and stretching treatment system after film blowing, adjusts the transverse and longitudinal stretching difference of the film, and changes the crystallinity and the grain size of the film through repeated heating and cooling and alternate rapid heating and quenching change of temperature, thereby leading the transverse and longitudinal difference of the material to be more balanced.
Description
Technical Field
The utility model relates to an online annealing and stretching treatment device for preparing a film material with more balanced transverse and longitudinal differences.
Background
Film materials are mostly produced in a film blowing mode, but the transverse and longitudinal stretching of the film after film blowing is inconsistent, so that the physical properties of the material in the transverse and longitudinal direction are different, and the maximum difference can reach 2-3 times; therefore, the film formed by extrusion needs to be annealed and stretched, so that the transverse and longitudinal orientation of the film tends to balance, and the crystallinity and the grain size can be better controlled.
Some annealing devices are available in the market at present, but are limited by annealing heating efficiency, and generally an annealing stretching device needs to be separately arranged to achieve the required annealing effect, such as a plastic film annealing device disclosed in chinese patent publication No. CN111070626A, a device and a method for longitudinally stretching a film tape disclosed in chinese patent publication No. CN102725125A, and a vertical longitudinal stretching machine disclosed in chinese patent publication No. CN 102601992A. This results in a lower production efficiency and a failure to satisfy the blowing production efficiency.
In order to meet the requirement of annealing and stretching treatment of the thin film, a special device needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a blown film on-line annealing and stretching treatment device, which aims to realize on-line annealing and stretching treatment, realize the balance of the transverse and longitudinal orientation of a film and provide better film performance.
In order to achieve the purpose of the utility model, the utility model provides an online annealing and stretching treatment device for blown film, which is characterized by comprising a preheating oven, a preheating roller set and a cooling roller set;
the temperature in the preheating oven is set to be lower than 80 ℃;
a preheating roller set and a cooling roller set are arranged behind the preheating oven;
a plurality of preheating rollers are arranged in the preheating roller group;
a plurality of cooling rollers are arranged in the cooling roller group;
the thin film alternately passes through the preheating roller and the cooling roller;
the temperature difference between the preheating roller and the cooling roller is more than 50 ℃.
As a further improvement of the utility model, a plurality of guide rollers are arranged in the preheating oven, and the film alternately bypasses the roller group consisting of the guide rollers.
As a further improvement of the utility model, the contact time of the film on the surfaces of the preheating roller and the cooling roller is more than 0.5S.
As a further improvement of the utility model, the number of the preheating rollers in the preheating roller group and the number of the preheating rollers in the cooling roller group are not less than 3.
As a further improvement of the present invention, the rotation speeds of the preheating roller and the cooling roller are not synchronized, and the film between the preheating roller and the cooling roller pair generates a stretching tension.
The utility model arranges a special annealing and stretching treatment system after film blowing, adjusts the transverse and longitudinal stretching difference of the film, and changes the crystallinity and the grain size of the film through repeated heating and cooling and alternate rapid heating and quenching change of temperature, thereby leading the transverse and longitudinal difference of the material to be more balanced.
Compared with the prior art, the utility model has the advantages and beneficial effects that:
1. the annealing and stretching treatment system adopts the temperature alternation shock heating and quenching change, does not reduce the running speed of the film and meets the normal film blowing production requirement;
2. the pre-stretching is carried out in the heating process, and the pre-stretching is more uniform and stable through the sectional heating and stretching.
Drawings
FIG. 1 is a schematic view of an annealing and stretching treatment system according to the present invention.
Detailed Description
The utility model is further described below with reference to the following figures and specific examples.
The utility model provides a high-barrier steaming-resistant easy-uncovering film as an example for explanation;
the product structure is as follows: PP/SUYLN/PA/PVDC/PA/SUYLN/release material;
the preparation is carried out by adopting a multilayer coextrusion mode; and (5) producing by using a water-cooling line.
The material is plasticized and extruded, and the melt is rapidly cooled and shaped through a rapid cooling device, so that the film has low crystallinity. And then the film is drawn into the annealing and stretching treatment system, the orientation difference of the material in the transverse and longitudinal directions is reduced by preheating in an oven and repeatedly stretching and shaping by a plurality of rollers, and the stretched and shaped film is rolled by a rolling device.
The annealing and stretching treatment system comprises a preheating oven 1, a preheating roller set 3 and a cooling roller set 4 as shown in figure 1;
a plurality of guide rollers 2 are arranged in the preheating oven 1, a film is enabled to bypass the roller sets through the roller sets formed by the guide rollers 2, the preheating oven 1 is fully heated, and the temperature in the preheating oven 1 is set to be 50 +/-10 ℃; the surface temperature of the film output after being preheated by the preheating oven 1 is controlled to be 45 +/-10 ℃.
Then the film passes through the preheating roller group 3 and the cooling roller group 4, repeatedly passes through the preheating roller and the cooling roller, and changes the crystallinity and the grain size of the film through repeated heating, cooling and temperature change, thereby leading the transverse and longitudinal difference of the material to be more balanced.
Specifically, the method comprises the following steps:
the surface temperature of each preheating roller in the preheating roller group 3 is set to be 100 +/-5 ℃; the contact time is more than 0.5S;
the surface temperature of each cooling roller in the cooling roller group 4 is set to be 25 +/-5 ℃; the contact time is more than 0.5S;
the number of the preheating rollers in the preheating roller group 3 and the number of the cooling rollers in the cooling roller group 4 are not less than 3;
the surface temperature difference between the preheating roller and the cooling roller is about 75 ℃, and the crystal structure of the plastic film is improved through repeated quick heating and quick cooling treatment.
Furthermore, the speed control device is used for controlling the rotating speed of each preheating roller in the guide roller 2 and the preheating roller group 3 and the rotating speed of each cooling roller in the cooling roller group 4, so that the film is stretched in the winding process, particularly when passing through the preheating rollers of the preheating roller group 3, the film is stretched, the stretching ratio is controlled to be 0.7-1, and the transverse and longitudinal stretching difference of the material is more balanced.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the utility model is not limited to the embodiments disclosed, but is capable of various modifications and substitutions without departing from the spirit of the utility model.
Claims (4)
1. The film blowing on-line annealing and stretching treatment device is characterized by comprising a preheating oven, a preheating roller set and a cooling roller set;
a preheating roller set and a cooling roller set are arranged behind the preheating oven;
a plurality of preheating rollers are arranged in the preheating roller group;
a plurality of cooling rollers are arranged in the cooling roller group;
the film alternately passes through the preheating roller and the cooling roller.
2. The device for the on-line annealing and stretching treatment of the blown film according to claim 1, wherein a plurality of guide rollers are arranged in the preheating oven, and the film alternately bypasses the roller group consisting of the guide rollers.
3. The apparatus according to claim 1, wherein the number of the preheating rollers in the preheating roller group and the number of the cooling rollers in the cooling roller group are not less than 3.
4. The apparatus according to claim 1, wherein the preheating roll and the cooling roll are not synchronized in rotation speed, and the stretching tension is generated in the film between the preheating roll and the cooling roll pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022350579.8U CN215320787U (en) | 2020-10-20 | 2020-10-20 | Online annealing and stretching treatment device for blown film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022350579.8U CN215320787U (en) | 2020-10-20 | 2020-10-20 | Online annealing and stretching treatment device for blown film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215320787U true CN215320787U (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022350579.8U Active CN215320787U (en) | 2020-10-20 | 2020-10-20 | Online annealing and stretching treatment device for blown film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215320787U (en) |
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2020
- 2020-10-20 CN CN202022350579.8U patent/CN215320787U/en active Active
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