Stretching device for BOPP film

Abstract

The utility model discloses a stretching device for a BOPP (Biaxially-oriented Polypropylene) film, which comprises a stretching preheating roller, an accommodating groove is formed in the stretching preheating roller, a positioning groove is formed in the circumferential inner wall of the stretching preheating roller, a heating strip is inserted into the stretching preheating roller in a penetrating manner, an end cover is fixedly mounted at the end part of the heating strip, a mounting sleeve is fixedly mounted on the end cover, and a positioning groove is formed in the positioning groove. Mounting shafts are fixedly arranged at the end parts of the end covers, the end covers are arranged on the triangular frames through the mounting shafts at the end parts, and mounting seats are fixedly arranged at the end parts of the stretching preheating rollers. According to the stretching device for the BOPP thin film, uniform heating work can be carried out through the heating strip of a spiral structure on the outer side surface of the circumference of the stretching preheating roller, uniform preheating work can be carried out on materials covering the outer side of the circumference of the stretching preheating roller, and the situation that the stretching thickness is not uniform when a BOPP thick film is subsequently pulled up can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of BOPP film processing equipment, specifically a stretching device for BOPP film. Background Technology

[0002] OPP film is biaxially oriented polypropylene film. The production of BOPP film involves first passing the melt of high molecular weight polypropylene through a narrow die head to form sheets or thick films, and then stretching them through a stretching device at a certain temperature and set speed. During stretching, the film is preheated to ensure its ductility.

[0003] Regarding the patent for a stretching device for BOPP film, the authorized publication number CN115416272A describes a stretching device for BOPP film production. The paper proposes that the thick film is conveyed sequentially to the left, and the thick film is wound up by a collecting device. Tension is provided to make the thick film move along the tension roller and the preheating roller for lateral stretching. The tension roller and the preheating roller will also rotate due to friction. The stretched film is finally wound up to the collecting device by the guide of the flattening roller. When stretching the thick film into a film;

[0004] As per the instruction manual Figure 1 As shown: Although the above device can stretch the BOPP thick film through tension roller a and preheating roller b, when the preheating roller b preheats the BOPP thick film, it cannot preheat the BOPP thick film evenly, which makes it easy for uneven stretching thickness to occur during subsequent stretching. Utility Model Content

[0005] The purpose of this invention is to provide a stretching device for BOPP film to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a stretching device for BOPP film is provided, including a stretching preheating roller. The stretching preheating roller has an internal receiving groove and a positioning groove on its circumferential inner wall. A heating strip is inserted inside the stretching preheating roller, and an end cap is fixedly installed at the end of the heating strip. An mounting sleeve is fixedly installed on the end cap, and a mounting shaft is fixedly provided at the end of the end cap. The end cap is mounted on a tripod via the mounting shaft at the end, and a mounting seat is fixedly provided at the end of the stretching preheating roller.

[0007] Preferably, the heating strip has a spiral structure, and the heating strip is a detachable structure inside the stretching preheating roller.

[0008] Preferably, the axial cross-section of the heating strip and the stretching preheating roller is a concentric circle structure, and the length of the heating strip is less than the length of the stretching preheating roller. At the same time, a first positioning plate and a second positioning plate are fixedly installed on the heating strip.

[0009] Preferably, the first positioning sheet and the second positioning sheet are circular structures made of rock wool board, and the diameters of the first positioning sheet and the second positioning sheet are consistent, and the circumferential outer walls of the first positioning sheet and the second positioning sheet are fixedly provided with three groups of positioning blocks.

[0010] Preferably, the positioning blocks and the positioning grooves are matched in size, and the positioning blocks are inserted into the interiors of the positioning grooves, and the cross sections of the positioning blocks and the positioning grooves are dovetail-shaped structures.

[0011] Preferably, the mounting sleeve and the mounting seat are matched in size, and the circumferential outer walls of the mounting seat are uniformly provided with three groups of threaded holes, and the circumferential outer walls of the mounting sleeve are uniformly provided with three groups of through holes, and the mounting sleeve is sleeved on the outer side of the mounting seat and is fixed by being screwed into the interiors of the threaded holes through the through holes.

[0012] Preferably, the heating strip is positioned and mounted in the interior of the stretching preheating roller through the first positioning sheet, the positioning block, the second positioning sheet and the positioning groove, and the cross sections of the positioning groove and the positioning block are rectangularly arranged.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The first positioning sheet and the second positioning sheet on the outer side of the heating strip are inserted into the interior of the stretching preheating roller, and are quickly positioned and mounted through the positioning groove and the positioning block, the first positioning sheet and the second positioning sheet are rock wool of heat insulation material, when the heating strip generates heat, a local high temperature zone is not generated on the surface of the stretching preheating roller through the first positioning sheet and the second positioning sheet, and the heating strip can be quickly positioned and mounted in the interior of the stretching preheating roller.

[0015] 2. The circumferential outer side surface of the stretching preheating roller can be uniformly heated by the spiral-shaped heating strip, the material covered on the circumferential outer side of the stretching preheating roller can be uniformly preheated, and the BOPP thick film can be prevented from being stretched unevenly in the subsequent stretching. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a stretching device schematic view for BOPP film mentioned in the background art;

[0017] Figure 2 It is a stretching preheating roller and mounting structure schematic view in the stretching device;

[0018] Figure 3 It is Figure 2 the bottom view;

[0019] Figure 4 It is Figure 2 the top view;

[0020] Figure 5 Fig. 1 is a schematic view of a partial structure of the present application. Figure 2

[0021] Fig. 1 is a schematic view of a partial structure of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-5 The present application provides a stretching device for BOPP film, which comprises a stretching preheating roller 1. The stretching preheating roller 1 is internally provided with a containing groove, and a positioning groove 2 is formed on the circumferential inner wall of the stretching preheating roller 1. Meanwhile, a heating strip 7 is inserted into the stretching preheating roller 1, and an end cover 9 is fixedly installed at the end of the heating strip 7. An installation sleeve 8 is fixedly installed on the end cover 9, and an installation shaft is fixedly arranged at the end of the end cover 9. The end cover 9 is arranged on a tripod 11 through the installation shaft at the end. An installation seat 3 is fixedly arranged at the end of the stretching preheating roller 1.

[0024] When in use, the heating strip 7 is held by hand, the first positioning piece 5 and the second positioning piece 6 outside the heating strip 7 are inserted into the stretching preheating roller 1, and are quickly positioned and installed through the positioning groove 2 and the positioning block 51. The first positioning piece 5 and the second positioning piece 6 are made of rock wool which is a heat-insulating material. When the heating strip 7 is heated, no local high-temperature zone is generated on the surface of the stretching preheating roller 1 through the first positioning piece 5 and the second positioning piece 6. Finally, the installation sleeve 8 is sleeved outside the installation seat 3 and is fixedly screwed into the screw hole 4 through the bolt passing through the perforation 10. At this time, the circumferential outer surface of the stretching preheating roller 1 can be uniformly heated by the heating strip 7 in a spiral structure, the material covering the circumferential outer side of the stretching preheating roller 1 can be uniformly preheated, and the uneven stretching thickness of the BOPP thick film during subsequent stretching can be avoided. The heating strip 7 in the stretching preheating roller 1 can be powered by an external power supply.

[0025] As a preferable embodiment, the heating strip 7 is in a spiral structure, and the heating strip 7 is in a detachable structure in the stretching preheating roller 1.

[0026] ​The axial section of the heating strip 7 and the stretching preheating roller 1 is a concentric circle structure, and the length of the heating strip 7 is less than the length of the stretching preheating roller 1, and the first positioning sheet 5 and the second positioning sheet 6 are fixedly installed on the heating strip 7.

[0027] The first positioning sheet 5 and the second positioning sheet 6 are both circular structures made of rock wool boards, and the diameters of the first positioning sheet 5 and the second positioning sheet 6 are consistent, and the circumferential outer walls of the first positioning sheet 5 and the second positioning sheet 6 are fixedly provided with three groups of positioning blocks 51.

[0028] As a preferable implementation, the positioning blocks 51 are matched with the sizes of the positioning grooves 2, and the positioning blocks 51 are inserted into the interiors of the positioning grooves 2, and the sections of the positioning blocks 51 and the positioning grooves 2 are dovetail structures.

[0029] As a preferable implementation, the mounting sleeve 8 is matched with the size of the mounting seat 3, and the circumferential outer wall of the mounting seat 3 is uniformly provided with three groups of threaded holes 4, and the circumferential outer wall of the mounting sleeve 8 is uniformly provided with three groups of through holes 10, and the mounting sleeve 8 is sleeved on the outer side of the mounting seat 3 and is fixedly screwed in the interiors of the threaded holes 4 through the bolts passing through the through holes 10.

[0030] The heating strip 7 is positioned and installed in the interior of the stretching preheating roller 1 through the first positioning sheet 5, the positioning blocks 51, the second positioning sheet 6 and the positioning grooves 2, and the sections of the positioning grooves 2 and the positioning blocks 51 are both rectangularly arranged.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A stretching device for BOPP film comprising a stretching preheating roller (1), characterized in that: The inside of the stretching preheating roller (1) is provided with a containing groove, and the circumferential inner wall of the stretching preheating roller (1) is provided with a positioning groove (2), meanwhile, the inside of the stretching preheating roller (1) is inserted with a heating strip (7), and the end of the heating strip (7) is fixedly installed with an end cover (9), the end cover (9) is fixedly installed with a mounting sleeve (8), and the end of the end cover (9) is fixedly provided with a mounting shaft, and the end cover (9) is arranged on the tripod (11) through the mounting shaft at the end, and the end of the stretching preheating roller (1) is fixedly provided with a mounting seat (3).

2. A stretching device for BOPP film as claimed in claim 1, wherein: The heating strip (7) is of a spiral structure, and the heating strip (7) is of a detachable structure in the inside of the stretching preheating roller (1).

3. A stretching device for BOPP film as claimed in claim 1, wherein: The axial section of the heating strip (7) and the stretching preheating roller (1) is of a concentric circle structure, and the length of the heating strip (7) is less than that of the stretching preheating roller (1), and the first positioning piece (5) and the second positioning piece (6) are fixedly installed on the heating strip (7).

4. A stretching device for BOPP film as claimed in claim 3, wherein: The first positioning piece (5) and the second positioning piece (6) are both of a circular structure made of rock wool board, and the diameters of the first positioning piece (5) and the second positioning piece (6) are consistent, and the circumferential outer wall of the first positioning piece (5) and the second positioning piece (6) is fixedly provided with three groups of positioning blocks (51).

5. A stretching device for BOPP film as claimed in claim 4, wherein: The size of the positioning block (51) is matched with that of the positioning groove (2), the positioning block (51) is inserted into the inside of the positioning groove (2), and the section of the positioning block (51) and the positioning groove (2) is both of a dovetail structure.

6. A stretching device for BOPP film as claimed in claim 1, wherein: The size of the mounting sleeve (8) is matched with that of the mounting seat (3), the circumferential outer wall of the mounting seat (3) is uniformly provided with three groups of screw holes (4), the circumferential outer wall of the mounting sleeve (8) is uniformly provided with three groups of through holes (10), the mounting sleeve (8) is sleeved outside the mounting seat (3) and fixedly screwed in the inside of the screw holes (4) through the bolts passing through the through holes (10).

7. A stretching device for BOPP film as claimed in claim 1, wherein: The heating strip (7) is positioned and installed in the inside of the stretching preheating roller (1) through the first positioning piece (5), the positioning block (51), the second positioning piece (6) and the positioning groove (2), and the section of the positioning groove (2) and the positioning block (51) is both of a rectangular structure.

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