CN-117048034-B - Stretching roller for preparing biaxially oriented film

CN117048034BCN 117048034 BCN117048034 BCN 117048034BCN-117048034-B

Abstract

The stretching roller for preparing the biaxially oriented film comprises a roller body and is characterized in that the roller body is of a hollow cylindrical structure with a certain radian on the outer surface, two-stage spiral protrusions for increasing friction force are formed on the outer surface of the roller body, detachable rotating shafts are respectively arranged at the center positions of the left end and the right end of the roller body, the left rotating shaft is a solid shaft, the right rotating shaft is a hollow rotating shaft, and an electric heating wire and a temperature sensor are arranged in the roller body. The invention has simple and reasonable structure, is convenient to assemble and disassemble, can realize pre-stretching, can correct the movement direction of the blank, prevents the blank from deviating, and effectively improves the product quality.

Inventors

WANG HONGJIE
CHEN GANG
LIU KAI
WANG WENLONG
QI ZEXING
QIAN KUNMING

Assignees

中国兵器科学研究院宁波分院

Dates

Publication Date: 20260508
Application Date: 20230818

Claims (7)

1. A stretching roller for preparing a biaxially oriented film comprises a roller body and is characterized in that the roller body is of a hollow cylindrical structure with a certain radian on the outer surface and a circular arc structure with high centers and low centers, two-stage spiral protrusions for increasing friction force are formed on the outer surface of the roller body, detachable rotating shafts are respectively arranged at the center positions of the left end and the right end of the roller body, the left rotating shaft is a solid shaft, the right rotating shaft is a hollow rotating shaft, electric heating wires and temperature sensors for controlling temperature are arranged in the roller body, first-stage spiral protrusions in the two-stage spiral protrusions are symmetrically distributed on the middle longitudinal section of the roller body, the rotating directions are opposite, the protrusions are circular arcs, the radius is larger, a plurality of second-stage spiral protrusions are distributed on the surface of each first-stage protrusion, the rotating directions are the same as those of the first-stage spiral protrusions, the protrusions are circular arcs, and the radius is smaller.
2. The stretching roller for preparing biaxially oriented film according to claim 1, wherein the roller surface of the roller body is a smooth polished surface.
3. The stretching roller for preparing the biaxially oriented film according to claim 2, wherein the left end of the roller body is closed, the right end of the roller body is opened, a key groove is concavely formed in the left end of the solid shaft on the left side, a flange is arranged on the right end of the solid shaft, and the solid shaft is fixedly connected with the roller body through the flange and bolts.
4. The stretching roller for preparing the biaxially oriented film according to claim 3, wherein the right end opening of the roller body is provided with a right cover plate in a butt joint manner, the left end of the hollow rotating shaft on the right side is fixedly arranged at the center of the outer end surface of the right cover plate, a fixed shaft is arranged in the hollow rotating shaft in a penetrating manner, and a ball bearing which is convenient for the rotation of the hollow rotating shaft is arranged between the hollow rotating shaft and the fixed shaft.
5. The stretching roller for preparing the biaxially oriented film according to claim 4, wherein the edge of the right cover plate is provided with a plurality of fixing holes, the right cover plate is fixed at the right opening position of the roller body through bolts, the fixing shaft is a hollow shaft, and the right end of the fixing shaft is fixed with the frame.
6. The stretching roller for preparing the biaxially oriented film according to claim 5, wherein a bracket for setting a power supply heating wire is arranged in the roller body, the bracket is horizontally arranged in the middle position in the roller body, and the right end of the bracket is fixedly connected with the inner side of the right cover plate.
7. The stretching roller for preparing the biaxially oriented film according to claim 6, wherein the temperature sensor is arranged at the middle position of the inner wall of the roller body, a central through hole which is communicated with the hollow rotating shaft and the fixed shaft is formed at the central position of the right cover plate, and the conducting wire of the electric heating wire and the signal wire of the temperature sensor are led out from the center of the fixed shaft through the central through hole.

Description

Stretching roller for preparing biaxially oriented film Technical Field The invention belongs to the technical field of biaxially oriented film preparation, and relates to a stretching roller for biaxially oriented film preparation. Background Biaxially oriented plastic film (Biaxially Oriented PLASTICS FILM), BOPF for short, is a product obtained by special processing by physical, chemical, mechanical means, etc., longitudinal and transverse stretching of thick film or flat sheet at a temperature lower than the melting point of the film and higher than the glass transition temperature, and then heat setting treatment in a tensioned state. BOPF has the advantages of light weight, moisture resistance, low air permeability, high mechanical strength and the like, is widely used for packaging products such as foods, medicines, daily light industry and the like, and is widely used as a base material of a composite film. The stretching temperature and the stretching ratio are key factors affecting the uniformity of the transverse thickness of the biaxially oriented plastic film. In biaxially oriented film production, transverse stretching is an important and complex process, the entire process being carried out in a continuous thermal environment. Studies have shown that the transverse stretching process has multiple starting points of stretching, which are mainly due to certain weak points in the transverse thickness, higher transverse stretching rates, and impurities, bubbles and appearance defects in the film. The multi-stretching starting point is commonly existed in the stretching of plastic films, is unstable in stretching, and is easy to cause uneven thickness of products, thereby influencing the quality of the products. Therefore, it is necessary to provide a multifunctional stretching roller which is used before the transverse stretching process, can realize the pre-transverse stretching, and can correct the movement direction of the blank and prevent the blank from deviating. Disclosure of Invention The invention aims to solve the technical problems of providing the stretching roller for preparing the biaxially oriented film, which has simple and reasonable structure and good use effect, can realize pre-stretching, and can correct the movement direction of a blank and prevent the blank from deviating. The stretching roller for preparing the biaxially oriented film comprises a roller body and is characterized in that the roller body is of a hollow cylindrical structure with a certain radian on the outer surface, two-stage spiral bulges for increasing friction force are formed on the outer surface of the roller body, detachable rotating shafts are respectively arranged at the center positions of the left end and the right end of the roller body, the left rotating shaft is a solid shaft, the right rotating shaft is a hollow rotating shaft, and an electric heating wire and a temperature sensor are arranged in the roller body. As improvement, the outer surface of the roller body is of an arc structure with a center high and two sides low, the roller surface is of a smooth polished surface, first-stage spiral bulges in the two-stage spiral bulges are symmetrically distributed on the middle longitudinal section of the roller body, the rotating directions are opposite, the bulges are arc-shaped, the radius is larger, second-stage spiral bulges are distributed on the surface of the first-stage bulges, the rotating directions are the same as those of the first-stage spiral bulges, and the bulges are arc-shaped and have smaller radius. Further, the left end of the roller body is closed, the right end of the roller body is opened, the left end of the solid shaft on the left side is concavely provided with a key slot, the right end of the solid shaft is provided with a flange plate, and the solid shaft is fixedly connected with the roller body through the flange plate and a bolt. Still further, right side end opening part of roll body has right apron to closing, and the left end of the hollow pivot of right side is fixed to be set up in the outer terminal surface central point of right apron put, wears to put a fixed axle in the hollow pivot, is equipped with the ball bearing of the rotatory hollow pivot of being convenient for between hollow pivot and the fixed axle. Still further, a plurality of fixed orifices have been seted up to the edge of right cover plate, and right cover plate passes through the right side open position of bolt fastening at the roll body, and the fixed axle is the hollow shaft, and the right-hand member of fixed axle is fixed with the frame. Further, be equipped with the support that power supply heating wire set up in the roll body, the support is the level setting intermediate position in the roll body, the right-hand member of support and the inboard fixed connection of right cover plate. Finally, the temperature sensor is arranged at the middle position of the inner wall of the roller b