An ultrasonic indentation device and film rewinder

Abstract

The application discloses an ultrasonic indentation device and a film rewinding machine. The ultrasonic indentation device comprises an ultrasonic generator, the lower end of the ultrasonic generator is provided with a die head, a press wheel is arranged below the die head and can reciprocate relative to the die head to form an indentation station with the die head, the press wheel is rotatably arranged and the circumferential surface of the press wheel is provided with a boss structure to form continuous indentations on the surface of the material to be indented when the material to be indented continuously passes through the indentation station. The film rewinding machine comprises the ultrasonic indentation device. The ultrasonic indentation device and the film rewinding machine can form effective indentation structure on the raw material of the packaging bag, effectively solve the problems that the existing packaging bag is not easy to tear and the opening is not flat, and make the packaging bag opening more labor-saving and neat.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of film and packaging bag production and processing, and particularly relates to an ultrasonic indentation device and a film rewinding machine. BACKGROUND

[0002] Packaging bags are everywhere in daily life and production, such as food packaging, which is the most common application category. The daily use objects are spread among men, women, old and young, and can be said to penetrate into all aspects of people's life. For packaging bags, not only the strength of the packaging should be ensured, but also the ease and neatness of opening the bag should be considered. Especially for the elderly, children or other vulnerable groups, the demand for ease and neatness is more urgent.

[0003] Most of the existing packaging bags are made of plastic, paper or composite film materials. It is relatively laborious to tear them open, and because the stress distribution at the tear opening is uneven, it is extremely easy to deviate from a straight line, thereby damaging the bag structure and causing the contents to flow out and spill, such as snacks spilling on the ground, and seasoning staining clothes. In addition, the uneven bag opening is not conducive to later storage, or after deviating from the straight line, the tear opening fails to tear open the packaging bag, requiring multiple tearing operations.

[0004] To solve this technical problem, the applicant improves the structure of the packaging bag by setting a notch structure on the packaging bag. However, due to the difference in processing products, the existing indentation equipment in other fields usually uses mechanical stamping technology. For the light and thin material of the packaging bag, direct application of these devices cannot achieve the desired effect.

[0005] Therefore, the prior art needs to be improved and developed. SUMMARY

[0006] The purpose of the embodiments of the present application is to provide an ultrasonic indentation device and a film rewinding machine, which are applied to the production line of packaging bags and can form effective notch structures on the raw materials of the packaging bags, thereby effectively solving the problems of the existing packaging bags that are not easy to tear open and have uneven openings, making the opening of the packaging bags more labor-saving and neat.

[0007] To solve the technical problem, on the one hand, the ultrasonic indentation device provided by the embodiments of the present application comprises:

[0008] An ultrasonic generator, a lower end of the ultrasonic generator is provided with a die head;

[0009] A pressure roller, the pressure roller is arranged below the die head and can reciprocate relative to the die head to form an indentation station with the die head;

[0010] The pressure roller is rotatably arranged, and the circumferential surface of the pressure roller is provided with a boss structure to form continuous notches on the surface of the material to be indented when the material to be indented continuously passes through the indentation station.

[0011] Further, the boss structure comprises at least two bosses arranged side by side on the circumferential surface of the pressing wheel.

[0012] Further, the boss has a cross section in the shape of an equilateral triangle with a side length of 1.2 mm.

[0013] Further, the bottom of the mold head is provided with a pressing platform, and the pressing platform and the boss structure form the indentation station.

[0014] Further, the pressing wheel is connected with an adjusting assembly, the adjusting assembly comprises a fixed plate and a sliding plate movably arranged below the fixed plate, a first adjusting bolt and a second adjusting bolt are arranged between the fixed plate and the sliding plate, the screw end of the first adjusting bolt penetrates through the fixed plate and is connected with the sliding plate to rotate and drive the sliding plate to reciprocate, the screw end of the second adjusting bolt is connected with the fixed plate and penetrates through the fixed plate to abut against the sliding plate, the fixed plate is fixedly arranged relative to the ultrasonic generator, and the pressing wheel is connected with the sliding plate.

[0015] Further, the adjusting assembly further comprises a limiting piece, the limiting piece is provided with a limiting groove, and the sliding plate is clamped in the limiting groove and can reciprocate along the limiting groove.

[0016] Further, the ultrasonic indentation device further comprises a mounting bracket, the mounting bracket has a top surface and a side surface perpendicular to each other, the fixed plate is connected with the top surface of the mounting bracket, the fixed plate is provided with a mounting portion in extension, the ultrasonic generator is connected with the mounting portion, and the limiting piece is connected with the side surface of the mounting bracket.

[0017] Further, the limiting piece is in the shape of L, and the end of any side wall of the limiting piece is connected with the mounting bracket, so that the other side wall of the limiting piece and the side surface of the mounting bracket form the limiting groove.

[0018] Further, the second adjusting bolt is provided with two and arranged on both sides of the first adjusting bolt.

[0019] On the other hand, the film rewinding machine provided by the embodiment of the present application comprises a unwinding mechanism, a winding mechanism and the above-mentioned ultrasonic indentation device, the ultrasonic indentation device is arranged between the unwinding mechanism and the winding mechanism, so that the film continuously passes through the indentation station of the ultrasonic indentation device.

[0020] The ultrasonic indentation device and the film rewinding machine provided by the application can adjust the gap of the indentation station by adjusting the pressure roller to apply pressure to the material to be indented, can emit ultrasonic waves through the ultrasonic generator, and can transmit the energy to the material to be indented through the mold head to make the material to be indented heat instantaneously and be compressed, so that a continuous indentation is formed on the surface of the material to be indented when the material to be indented continuously passes through the indentation station, the thickness of the indentation is relatively small compared with the thickness of the main body of the material, and the indentation is easy to tear, when the packaging bag is made of the material, the packaging bag can be torn along the straight track formed by the indentation when the packaging bag is torn open, so that the opening of the packaging bag is flat, the structure of the packaging bag is not damaged, storage in the later stage is facilitated, and the packaging bag is more labor-saving and neat when it is opened.

[0021] Other features and advantages of the application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structure schematic view of an ultrasonic indentation device provided by an embodiment of the application.

[0023] Figure 2 Another structure schematic view of an ultrasonic indentation device provided by an embodiment of the application.

[0024] Figure 3 A working state reference view of an ultrasonic indentation device provided by an embodiment of the application.

[0025] Figure 4 A structure schematic view of a pressure roller of an ultrasonic indentation device provided by an embodiment of the application. Figure 1

[0026] Figure 5 A structure schematic view of a mounting bracket of an ultrasonic indentation device provided by an embodiment of the application.

[0027] Figure 6 A structure schematic view of a mounting bracket of an ultrasonic indentation device provided by an embodiment of the application.

[0028] Figure 7 A cross-sectional schematic view of an indentation part of an embodiment of a packaging bag processed by an ultrasonic indentation device provided by an embodiment of the application.

[0029] ​Label explanation: 100, ultrasonic generator; 110, mold head; 111, press table; 200, pressure roller; 201, boss structure; 210, boss; 300, indentation station; 410, fixed plate; 420, sliding plate; 430, first adjusting bolt; 440, second adjusting bolt; 450, limiting piece; 500, mounting bracket; 500a, top surface; 500b, side surface; 101, ultrasonic indentation device; 102, unwinding mechanism; 103, winding mechanism; 600, material to be indented. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components have the same or similar reference numerals throughout the drawings and a repeated description thereof will be omitted. The embodiments described below are merely examples for the purpose of explanation and are not to be understood as limiting the present application.

[0031] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0032] In the description of the present application, it needs to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0034] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0035] As shown in Figure 1 , 2 The present application is an ultrasonic indentation device, comprising:

[0036] An ultrasonic generator 100, the lower end of the ultrasonic generator 100 is provided with a die head 110;

[0037] A press wheel 200 is arranged below the die head 110 and can reciprocate relative to the die head 110 to form an indentation station 300 with the die head 110;

[0038] The press wheel 200 is rotatably arranged, and the circumferential surface thereof is provided with a boss structure 201 to form a continuous indentation on the surface of the material to be indented 600 when the material to be indented 600 continuously passes through the indentation station 300.

[0039] As shown in Figure 3As shown, specifically, the material to be indented 600 can be a raw material for producing a packaging bag, such as plastic, paper, or composite film material, and in specific applications, the ultrasonic indentation device can be installed in an existing processing equipment to organically combine the indentation process of the ultrasonic indentation device into the production line of the packaging bag product, and the existing processing equipment can be used to transport the material to be indented 600, so that the material to be indented 600 continuously passes through the indentation station 300. Specifically, the ultrasonic indentation device can be installed in a (film) rewinding machine, and specifically arranged between the unwinding mechanism and the winding mechanism. Specifically, the ultrasonic generator 100 can be selected from the existing technology. Through the ultrasonic indentation device, an effective indentation can be formed on the material with a thickness of 10-80 pm.

[0040] In specific applications, the gap of the indentation station 300 (i.e. the gap between the die head 110 and the pressure roller 200) is adjusted by adjusting the pressure roller 200, so that the gap of the indentation station 300 is smaller than the thickness of the material to be indented 600, so as to apply pressure to the material to be indented 600, and utilize the elasticity of the material to be indented 600, when the material to be indented 600 deforms into the indentation station 300, the ultrasonic generator 100 emits ultrasonic waves, the energy is transmitted to the material to be indented 600 through the die head 110, the material to be indented 600 is instantaneously heated, and the part located on the boss structure 201 is thinned and shaped, when the material to be indented 600 continuously passes through the indentation station 300, a continuous and permanent indentation is formed on the surface of the material to be indented 600, so that the thickness of the indentation is smaller than the thickness of the main body of the material, and it is easy to tear; when the packaging bag uses the material, the bag body can be torn along the straight track formed by the indentation, so that the opening of the packaging bag is flat, the bag body structure is not damaged, it is beneficial to later storage, and the packaging bag is more labor-saving and neat when opening.

[0041] When the material to be indented or the packaging bag prepared therefrom is torn in specific applications, if the tearing force suddenly increases or the tearing direction suddenly changes, the tearing direction will deviate from the indentation and eventually tear, or even cannot be successfully torn. To further improve the above problems, the material to be indented 600 can be indented multiple times to form at least two indentations on the surface of the material, and in specific applications, when the tearing force suddenly increases or the tearing direction suddenly changes and deviates from the straight track of the current indentation, it can enter the adjacent indentation and continue to be torn flat and completely along the straight track of the indentation, and the overall opening flatness of the material or the packaging bag will not be affected, so that the success rate of flat tearing of the material or the packaging bag tends to 100% under a wider range of use conditions, and the opening of the packaging bag is further ensured to be labor-saving and neat. However, it is difficult to control the spacing between adjacent indentations, and it seriously affects the production efficiency.

[0042] AsFigure 5 As shown in some preferred embodiments, the above-mentioned boss structure 201 comprises at least two bosses 210 which are arranged side by side on the circumferential surface of the compression wheel 200. Thus, when the material to be indented 600 passes through the indentation station 300 once, at least two indentations can be formed on its surface, and the spacing between adjacent indentations is uniform, ensuring the effect of flat tearing of the material or the packaging bag. Specifically, when the boss structure 201 is provided with at least two bosses 210, the at least two bosses 210 can be arranged continuously or at a certain distance.

[0043] In some preferred embodiments, the distance between the at least two bosses 210 is less than the root width w of the boss 210. Thus, when the packaging bag is made of the material to be indented, the indentations on the two bag bodies of the packaging bag can be staggered, and when the packaging bag is opened, it can be opened along the straight line trajectory formed by the intersection of any one indentation on the first bag body and the corresponding indentation on the second bag body, as shown in the specific embodiment Figure 7 , wherein m is the two bag bodies of the packaging bag, and n is the indentation. Specifically, the connecting surface of the boss 210 and the body of the compression wheel 200 is the root of the boss 210, and the root width w of the boss 210 is the width of the connecting surface. Specifically, when the material to be indented is folded to form a packaging bag, the indentations on the two bag bodies of the packaging bag can also be completely symmetrical.

[0044] Specifically, the cross section of the boss 210 can be rectangular or trapezoidal. In some preferred embodiments, the cross section of the boss 210 is an equilateral triangle with a side length of 1.2 mm. Thus, by adjusting the gap of the indentation station 300, effective indentations can be formed on the surface of the material to be indented 600, i.e. to ensure the effectiveness of tearing, and the presence of indentations will not affect the overall appearance of the packaging bag.

[0045] As shown in some preferred embodiments, the cross section of the boss 210 is an equilateral triangle with a side length of 1.2 mm. Figure 4 As shown in some preferred embodiments, the bottom of the mold head 110 is provided with a pressing table, and the indentation station 300 is formed between the pressing table and the boss structure 201. Thus, the ultrasonic energy of the mold head 110 is concentrated together by the pressing table, and effective indentations can be quickly formed at the moment when the material to be indented 600 is conveyed and passes through the indentation station 300, thereby avoiding the phenomenon of material scratching when the boss structure 201 compacts the material to be indented 600 and fails to be thinned and shaped. Thus, the indentation process and the production line of the material or the packaging bag can be well integrated. Specifically, the pressing table can be a trapezoidal table structure, and as a preferred solution, the pressing table adopts a rectangular body structure, specifically a rectangular body with a length of 10 mm, a width of 10 mm, and a height of 1 mm.

[0046] AsFigure 1 、 2 As shown in FIGS. 11 and 12, in some preferred embodiments, the roller 200 is connected with an adjusting assembly, which comprises a fixed plate 410 and a sliding plate 420 movably arranged below the fixed plate 410. A first adjusting bolt 430 and a second adjusting bolt 440 are arranged between the fixed plate 410 and the sliding plate 420. The screw end of the first adjusting bolt 430 penetrates through the fixed plate 410 and is connected with the sliding plate 420 to rotate and drive the sliding plate 420 to reciprocate. The screw end of the second adjusting bolt 440 is connected with the fixed plate 410 and penetrates through the fixed plate 410 to abut against the sliding plate 420. The fixed plate 410 is fixedly arranged relative to the ultrasonic generator 100, and the roller 200 is connected with the sliding plate 420. In specific applications, the second adjusting bolt 440 is loosened first, the sliding plate 420 is moved by rotating the first adjusting bolt 430, the gap of the indentation station 300 is finely adjusted, the roller 200 is limited to move away from the fixed plate 410, then the second adjusting bolt is tightened to abut against the sliding plate 420, the roller 200 is limited to move towards the fixed plate 410, and is fixed. Specifically, the state of the roller 200 closing to the mold head 110 can be referred to FIG. 11, and the state of the roller 200 moving away from the mold head 110 can be referred to FIG. 12. Figure 1 Figure 2 .

[0047] Specifically, the sliding plate 420 is provided with a bearing structure, and a connecting shaft is fixedly connected to the bearing structure. The roller 200 is fixedly arranged at the free end of the connecting shaft. When the material 600 to be indented continuously passes through the indentation station 300, the roller 200 rotates along the surface of the material 600 to be indented, and finally forms a concave indentation.

[0048] In some preferred embodiments, the second adjusting bolt 440 is provided with two second adjusting bolts 440, which are respectively arranged on the two sides of the first adjusting bolt 430.

[0049] In specific applications, when the first adjusting bolt 430 is rotated for adjustment, the sliding plate 420 can be held by hand to prevent the sliding plate 420 from rotating synchronously in the rotating direction of the first bolt and affecting the adjustment, but it is inevitable that there is an error phenomenon that the roller 200 and the mold head 110 have an angle deviation after adjustment. In some preferred embodiments, the adjusting assembly further comprises a limiting piece 450, which is provided with a limiting groove, and the sliding plate 420 is clamped in the limiting groove and can reciprocate along the limiting groove. As a more preferred embodiment, the limiting piece 450 is provided with two limiting pieces 450, which are respectively arranged on the two sides of the sliding plate 420 in the moving direction of the sliding plate 420.

[0050] ​In some preferred embodiments, the limiting member 450 has an L-shaped structure, and the end of any side wall of the limiting member 450 is connected to the mounting bracket 500 so that the limiting groove is formed between the other side wall of the limiting member 450 and the side wall 500b of the mounting bracket 500.

[0051] like Figure 1 , 2 As shown in Figure 6, in some preferred embodiments, the ultrasonic indentation device further includes a mounting bracket 500, which has a top surface 500a and a side surface 500b perpendicular to each other. A fixing plate 410 is connected to the top surface 500a of the mounting bracket 500, and the fixing plate 410 extends to provide a mounting portion. The ultrasonic generator 100 is connected to the mounting portion, and the limiting member 450 is connected to the side surface 500b of the mounting bracket 500. In specific applications, the ultrasonic indentation device is connected to processing equipment such as a film rewinding machine via the mounting bracket 500. Generally, the film material 600 to be indented is horizontally extended through each processing equipment. The mounting bracket 500 is used to install the device, so that the mold head 110 of the ultrasonic generator 100 is positioned above the material 600 to be indented, and the pressure roller 200 presses the material 600 from below, thereby forming a concave mark on the lower surface of the material 600.

[0052] On the other hand, the film rewinding machine provided in this application includes an unwinding mechanism 102, a winding mechanism 103, and an ultrasonic indentation device 101 as described above. The ultrasonic indentation device 101 is disposed between the unwinding mechanism 102 and the winding mechanism 103 so that the film continuously passes through the indentation station 300 of the ultrasonic indentation device 101.

[0053] refer to Figure 3 Specifically, the unwinding mechanism 102 and the rewinding mechanism 103 can adopt existing technical means, such as the structure of the same mechanism in the existing rewinding machine.

[0054] The ultrasonic indentation device and film rewinding machine of the present application adjusts the gap of the indentation station 300 by adjusting the pressure roller 200 to apply pressure to the material to be indented 600, emits ultrasonic waves through the ultrasonic generator 100, and transmits energy to the material to be indented 600 through the mold head 110, so that the material to be indented 600 is heated instantaneously and is pressed thin. When the material to be indented 600 continuously passes through the indentation station 300, a continuous indentation is formed on the surface of the material to be indented 600, so that the thickness of the indentation is smaller than the thickness of the main body of the material, and the indentation is easy to tear. When the packaging bag is made of this material, the packaging bag can be torn along the straight track formed by the indentation when the bag is torn open, so that the opening of the packaging bag is flat, the bag body structure is not damaged, and the packaging bag is easy to store, and the packaging bag is more labor-saving and neat when the bag is opened. By arranging at least two protrusions 210 on the circumferential surface of the pressure roller 200, the success rate of tearing the material or the packaging bag flat is close to 100% in a wider range of use, further ensuring that the packaging bag is labor-saving and neat when the bag is opened. Through the ultrasonic indentation device, effective indentation can be formed on the material with a thickness of 10-80µm.

[0055] In the description of the present specification, the description of the terms "one embodiment", "certain embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] The above only describes some embodiments of the present application. Those skilled in the art can make several modifications and improvements without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. An ultrasonic indentation device, characterized by, The utility model relates to a kind of ultrasonic embossing device, including: Ultrasonic generator (100), the lower end of the ultrasonic generator (100) is equipped with mould head (110); Press wheel (200), the press wheel (200) is arranged below the mould head (110), and reciprocating motion can be carried out relative to the mould head (110), to form indentation station (300) with the mould head (110); The press wheel (200) is rotatably arranged, and the circumferential surface thereof is provided with boss structure (201), so as to form continuous concave indentation on the surface of the material to be indented (600) when the material to be indented (600) continuously passes through the indentation station (300), and the material to be indented at least includes the raw material of packaging bag; The boss structure (201) includes at least two bosses (210), and the at least two bosses (210) are arranged side by side on the circumferential surface of the press wheel (200), and the distance between the at least two bosses (210) is less than the root width w of the boss (210), so that when the two-side bag body of the packaging bag is made of the material to be indented, the concave indentations on the two-side bag body of the packaging bag can be staggered.

2. The ultrasonic creasing device of claim 1, wherein, The cross section of the boss (210) is an equilateral triangle with a side length of 1.2 mm.

3. The ultrasonic creasing device of claim 1, wherein, The bottom of the mould head (110) is provided with a press table (111), and the press table (111) and the boss structure (201) form the indentation station (300).

4. The ultrasonic indentation apparatus of claim 1, wherein, The press wheel (200) is connected with an adjusting assembly, the adjusting assembly includes a fixed plate (410) and a sliding plate (420) movably arranged below the fixed plate (410), a first adjusting bolt (430) and a second adjusting bolt (440) are arranged between the fixed plate (410) and the sliding plate (420), the screw end of the first adjusting bolt (430) penetrates through the fixed plate (410) and is connected with the sliding plate (420) to rotate and drive the sliding plate (420) to reciprocate, the screw end of the second adjusting bolt (440) is connected with the fixed plate (410) and penetrates through the fixed plate (410) to abut against the sliding plate (420), the fixed plate (410) is fixedly arranged relative to the ultrasonic generator (100), and the press wheel (200) is connected with the sliding plate (420).

5. The ultrasonic indentation apparatus of claim 4, wherein, The adjusting assembly further includes a limiting piece (450), the limiting piece (450) is provided with a limiting groove, the sliding plate (420) is clamped in the limiting groove and can reciprocate along the limiting groove.

6. The ultrasonic creasing device of claim 5, wherein, It also includes a mounting bracket (500) having a top surface (500a) and a side surface (500b) perpendicular to each other, the fixed plate (410) is connected with the top surface (500a) of the mounting bracket (500), the fixed plate (410) is provided with a mounting portion, the ultrasonic generator (100) is connected with the mounting portion, and the limiting piece (450) is connected with the side surface (500b) of the mounting bracket (500).

7. The ultrasonic indentation apparatus of claim 6, wherein, The limiting piece (450) is of L-shaped structure, and the end of any side wall of the limiting piece (450) is connected with the mounting bracket (500), so that the other side wall of the limiting piece (450) and the side surface (500b) of the mounting bracket (500) form the limiting groove.

8. The ultrasonic indentation apparatus of claim 4, wherein, The second adjusting bolt (440) is provided with two and is respectively arranged on the two sides of the first adjusting bolt (430).

9. A film rewinder characterized by, The ultrasonic indentation device (101) is arranged between the unwinding mechanism (102) and the winding mechanism (103), so that the film continuously passes through the indentation working position (300) of the ultrasonic indentation device (101).

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