CN211307376U

CN211307376U - Film embossing device and film preparation device

Info

Publication number: CN211307376U
Application number: CN201921813494.XU
Authority: CN
Inventors: 刘路; 朱智勇; 要文通
Original assignee: China Lucky Group Corp
Current assignee: Photoelectric materials Co.,Ltd.
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-08-21
Anticipated expiration: 2029-10-25

Abstract

The utility model discloses a film knurling device and film preparation facilities, film knurling device includes: a base; the embossing wheel is rotatably arranged on the base, a plurality of protrusions are arranged on the outer peripheral surface of the embossing wheel, the protrusions are distributed at intervals along the axial direction and the circumferential direction of the embossing wheel respectively, and the embossing wheel is provided with a heating cavity; the bottom wheel is rotatably arranged on the base and positioned on the outer side of the embossing wheel, the rotating axis of the bottom wheel is parallel to that of the embossing wheel, and one part of the outer peripheral surface of the bottom wheel is opposite to the plurality of protrusions; and the heating element is used for heating the embossing wheel and is arranged in the heating cavity. According to the utility model discloses a film knurling device can guarantee the apparent quality of film, guarantees the rolling quality of film.

Description

Film embossing device and film preparation device

Technical Field

The utility model relates to a film technical field particularly, relates to a film knurling device and having film preparation facilities of film knurling device.

Background

The preparation of cellulose lipid membrane usually adopts solution casting method, and the solution casting method comprises the procedures of preparing, casting, drying, rolling and the like of cotton glue solution. In the winding process, because the film surface of the inner film is in direct contact with the film surface of the outer film, the defects of film adhesion, corrugation, apparent scratch and the like can be caused, continuous embossed belts need to be processed on the two side edges of the film before winding, and the thickness of the embossed belts is larger than that of the film, so that the winding defect can be prevented.

Adopt the wheel roll extrusion mode to process out the knurling area among the correlation technique, that is to say, adopt stereoplasm cylinder wheel to roll the edge of film under the effect of certain pressure to form the annular knurl, the shaping state of annular knurl is one side sunken, and one side is protruding, and protruding side brings the film thickening effect.

However, the above knurling molding method is easy to cause the surface of the film to be damaged, and the generated powder affects the apparent quality of the film; in the process of rolling the film, stress is formed in the film, and the edge of the film is wavy and warped to deform, so that the quality of the subsequent winding and unwinding is influenced; moreover, the situation that the concave points of the inner film and the convex points of the outer film are overlapped easily occurs during rolling, so that thickening efficiency is reduced, and the normal rolling of the film cannot be guaranteed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a film knurling device, the apparent quality of film can be guaranteed to the film knurling device, guarantees the rolling quality of film.

The utility model discloses still provide one kind and have film preparation facilities of film knurling device.

According to the utility model discloses film knurling device of first aspect embodiment includes: a base; the embossing wheel is rotatably arranged on the base, a plurality of protrusions are arranged on the outer peripheral surface of the embossing wheel, the protrusions are distributed at intervals along the axial direction and the circumferential direction of the embossing wheel respectively, and the embossing wheel is provided with a heating cavity; the bottom wheel is rotatably arranged on the base and positioned on the outer side of the embossing wheel, the rotating axis of the bottom wheel is parallel to that of the embossing wheel, and one part of the outer peripheral surface of the bottom wheel is opposite to the plurality of protrusions; and the heating element is used for heating the embossing wheel and is arranged in the heating cavity.

According to the film embossing device provided by the embodiment of the utility model, the embossing wheel is heated by the heating element to melt the edge of the film, so that the film is softened, and the softened edge of the film forms the embossing belt under the action of the raised extrusion, thus, dust can be avoided, the apparent quality of the film can be ensured, and the action mode of hot melt molding is adopted, so that the generation of the stress in the film can be avoided, the deformation of warping and the like of the thickened part of the film can be prevented, and the rolling quality of the film can be ensured; in addition, because the bulges are only arranged on the embossing wheel, the embossing belt formed on the film is flat on one side and is protruded on the other side, so that an effective interval can be supported between two adjacent layers of films in the film winding process, the film surface of the inner film is prevented from being directly contacted with the film surface of the outer film, and the films are prevented from being adhered, bulged and apparent scratches.

In addition, the film embossing device according to the embodiment of the present invention has the following additional technical features:

according to some embodiments of the invention, the heating element is mounted on the base by a mounting bracket and spaced apart from an inner wall of the heating chamber.

According to some embodiments of the invention, the embossing wheel and at least one of the bottom wheels are movable relative to the base to adjust the gap between the embossing wheel and the bottom wheel.

According to some embodiments of the present invention, the film embossing apparatus further comprises: the support, the pedestal mounting just has the rotation chamber on the base, it is equipped with the pivot to rotate the intracavity, the knurling wheel is rotationally installed the one end of pivot.

In some embodiments of the present invention, the support is provided with a heat dissipation hole communicated with the rotation cavity.

In some embodiments of the present invention, a slide rail is disposed on the base, and the support is movably engaged with the slide rail.

In some embodiments of the present invention, the film embossing apparatus further comprises: the driving device is installed on the base and is in transmission connection with the support so as to drive the support to move.

In some embodiments of the present invention, the film embossing apparatus further comprises: the fine adjustment device is installed on the base and comprises an indicating instrument and a screw rod, and the screw rod is in transmission connection with the support so as to adjust the position of the support.

According to some embodiments of the present invention, the height of the protrusion in the radial direction of the embossing wheel is 1mm-2mm, the diameter or the side length of the bottom end of the protrusion is 0.1mm-0.12mm, and the distance between the central axes of the protrusion is 1 times to 2 times of the diameter or the side length of the bottom end of the protrusion.

According to the utility model discloses film preparation facilities of second aspect embodiment, include according to the utility model discloses film knurling device of first aspect embodiment.

According to the film preparation device provided by the embodiment of the utility model, the film embossing device is utilized, so that dust can be prevented from being generated in the film preparation process, the apparent quality of the film can be ensured, the generation of the internal stress of the film can be avoided, the thickened part of the film can be prevented from being deformed such as warping, and the winding quality of the film can be ensured; in addition, in the film rolling process, an effective interval can be supported between two adjacent layers of films, the direct contact between the film surface of the inner film and the film surface of the outer film is avoided, and the films are prevented from being adhered, bulged and scratched.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a perspective view of a film embossing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a film embossing apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a film embossing apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a film embossing apparatus according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A in FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B in FIG. 4;

FIG. 7 is a cross-sectional view taken along line C-C in FIG. 4;

FIG. 8 is a schematic structural view of an embossing roll according to an embodiment of the present invention;

FIG. 9 is a cross-sectional view of an embossing wheel according to an embodiment of the present invention;

FIG. 10 is a schematic view of the distribution of protuberances on an embossing wheel according to an embodiment of the present invention;

fig. 11 is a cross-sectional view of a projection according to an embodiment of the invention;

fig. 12 is a perspective view of a film prepared by the film preparing apparatus according to an embodiment of the present invention.

Reference numerals:

a film embossing device 1, a film 2,

A base 10, a slide rail 11, a bearing 12, an assembly plate 13, an assembly bearing 14,

Embossing wheel 20, projection 21, heating cavity 23, rotating shaft 24,

A bottom wheel 30, a gap 31, a heating member 40, a mounting bracket 41,

A support 50, a rotating cavity 51, a heat dissipation hole 52,

A driving device 60, a telescopic rod 61,

Indicating instrument 71, screw 72.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A film embossing apparatus 1 according to an embodiment of the first aspect of the present invention is described below with reference to the drawings.

As shown in fig. 1 to 12, a film embossing apparatus 1 according to an embodiment of the present invention includes: a base 10, an embossing roller 20, a bottom roller 30, and a heating member 40.

Specifically, the embossing roller 20 is rotatably provided on the base 10, and the outer peripheral surface of the embossing roller 20 is provided with a plurality of protrusions 21, and the plurality of protrusions 21 are respectively spaced in the axial direction and the circumferential direction of the embossing roller 20. For example, the axial direction of the embossing wheel 20 is oriented in the left-right direction, the protrusions 21 may be conical or pyramidal, and a plurality of protrusions 21 are arranged in a plurality of rows in the circumferential direction of the embossing wheel 20, each row of protrusions 21 being spaced apart in the left-right direction.

The embossing wheel 20 has a heating chamber 23. The bottom wheel 30 is rotatably provided on the base 10, the bottom wheel 30 is positioned outside the embossing wheel 20, the rotation axis of the bottom wheel 30 is arranged in parallel with the rotation axis of the embossing wheel 20, and a part of the outer peripheral surface of the bottom wheel 30 is opposed to the plurality of protrusions 21. The heating element 40 is used to heat the embossing wheel 20, and the heating element 40 is provided in the heating chamber 23. For example, the embossing roller 20 and the bottom roller 30 are spaced apart in the up-down direction, the bottom roller 30 is directly above the embossing roller 20, the lowest end of the outer peripheral surface of the bottom roller 30 faces the plurality of protrusions 21, the lowest end of the outer peripheral surface of the bottom roller 30 is spaced apart from the highest ends of the protrusions 21, that is, a gap 31 is formed between the embossing roller 20 and the bottom roller 30, the gap 31 is adapted to pass through the film 2, and the gap 31 is smaller than the thickness of the film 2.

In the embossing process, the film 2 is rolled into the gap 31 under the action of the embossing wheel 20, because the heating element 40 heats the embossing wheel 20, when the film 2 enters the gap 31, the heated embossing wheel 20 melts the film 2, the bottom wheel 30 flattens the upper surface of the film 2 to form a flat surface, meanwhile, the protrusion 21 is inserted into the lower surface of the melted film 2 and extrudes the melted film around the protrusion 21, the extruded film is cooled and formed to form a protrusion, and thus an embossing belt with a flat upper surface and a protruding lower surface is formed on the film 2.

According to the film embossing device 1 of the embodiment of the utility model, the embossing wheel 20 is heated by the heating element 40 to melt the film 2, so that the film is softened, and the softened film 2 forms an embossing belt under the extrusion action of the bulge 21, thus avoiding dust generation and ensuring the apparent quality of the film 2, and due to the adoption of the action mode of hot melt molding, avoiding the generation of internal stress, preventing the thickened part of the film 2 from deforming such as warping and ensuring the rolling quality of the film 2; in addition, because the bulge 21 is only arranged on the embossing wheel 20, the embossing belt formed on the film 2 is flat on one side and convex on the other side, so that an effective interval can be supported between two adjacent layers of films 2 in the winding process of the film 2, the film surface of the inner film 2 is prevented from being directly contacted with the film surface of the outer film 2, and the films 2 are prevented from being adhered, ridged and scratched apparently.

According to some embodiments of the present invention, as shown in fig. 1, the heating element 40 is mounted on the base 10 by a mounting bracket 41, the heating element 40 being spaced apart from the inner wall of the heating chamber 23.

For example, the heating cavity 23 penetrates through the right end surface of the embossing wheel 20, i.e., the heating cavity 23 is a cylindrical cavity that is open to the right. The heating element 40 extends into the heating cavity 23 from the opening of the heating cavity 23, the tail end of the heating element 40 is fixed on the mounting bracket 41, the heating part of the heating element 40 is positioned in the heating cavity 23, and the heating element 40 is not in contact with the embossing wheel 20. Thus, the heating member 40 does not affect the flexible rotation of the embossing roller 20, and the embossing roller 20 can be uniformly heated, with a good heating effect.

Alternatively, heating element 40 may be heated to a temperature in the range of 100 ℃ to 250 ℃. For example, the amount of heat generation may be controlled by an external temperature control system, thereby performing heat radiation baking heating on the embossing wheel 20. Thus, the heating effect is better.

According to some embodiments of the present invention, as shown in fig. 2, at least one of the embossing wheel 20 and the bottom wheel 30 is movable relative to the base 10 to adjust the gap 31 between the embossing wheel 20 and the bottom wheel 30. For example, the bottom wheel 30 is fixed to the base 10, and the embossing wheel 20 is movable in the up-down direction with respect to the base 10; alternatively, the embossing roller 20 is fixed to the base 10, and the bottom roller 30 is movable in the up-down direction with respect to the base 10; for another example, the embossing wheel 20 can move in the up-down direction with respect to the base 10, and the bottom wheel 30 can move in the up-down direction with respect to the base 10. In this way, the size of the gap 31 can be adjusted.

The size of the gap 31 influences the depth of the protrusion 21 inserted into the film 2, and thus the volume of the extruded film, and thus the height of the protrusion on the embossing belt. That is, the larger the gap 31, the deeper the depth of the projection 21 inserted into the film 2, and the larger the volume of the extruded film material, so that the height of the projection on the embossing belt is increased, and the thickening effect is remarkable.

According to some embodiments of the present invention, as shown in fig. 5, the film embossing apparatus 1 further includes: a support 50. The holder 50 is installed on the base 10, the holder 50 has a rotation chamber 51, a rotation shaft 24 is provided in the rotation chamber 51, and the embossing roller 20 is rotatably installed at one end of the rotation shaft 24. Specifically, the bearing 12 is installed at the left end of the rotating cavity 51, the bearing 12 is installed at the right end of the rotating cavity 51, the rotating shaft 24 is rotatably fitted in the bearing 12, the rotating shaft 24 extends out of the rotating cavity 51 to the right, the embossing roller 20 is installed at the right end of the rotating shaft 24, and the rotating shaft 24 rotates to drive the embossing roller 20 to rotate. Therefore, the structure is compact and the integrity is good.

In some embodiments of the present invention, as shown in fig. 5, the support 50 is provided with a heat dissipation hole 52 communicating with the rotation cavity 51. For example, the heat radiating hole 52 penetrates through the inner wall of the rotation chamber 51 and the outer surface of the holder 50. Therefore, the heat in the rotating cavity 51 can be taken away, so that the heat dissipation effect is good, the heat deformation quantity of the rotating shaft 24 is ensured, and the service life of the bearing 12 is ensured.

Further, as shown in fig. 1, a plurality of heat dissipation holes 52 are provided, and the plurality of heat dissipation holes 52 are disposed at intervals on the holder 50. Thus, the heat dissipation effect is better.

In some embodiments of the present invention, as shown in fig. 5, the base 10 is provided with a sliding rail 11, and the support 50 is movably engaged with the sliding rail 11. For example, the left end of the base 10 is provided with a slide rail 11 extending in the vertical direction, the right end of the base 10 is provided with a slide rail 11 extending in the vertical direction, the left end of the support 50 is provided with a slide groove extending in the vertical direction, the right end of the support 50 is provided with a slide groove extending in the vertical direction, and the slide groove is matched with the slide rail 11 in shape. Thus, the movement of the holder 50 can be guided, and the sliding is smooth.

Further, as shown in fig. 1, the mounting bracket 41 is mounted on the mount 50. In this way, the heating member 40 can be moved synchronously with the embossing roller 20 by the support 50.

In some embodiments of the present invention, as shown in fig. 1, the film embossing apparatus 1 further includes: a drive means 60. The driving device 60 is installed on the base 10, and the driving device 60 is in transmission connection with the support 50 to drive the support 50 to move. Specifically, the driving device 60 may be a cylinder located below the support 50, the cylinder having a telescopic rod 61, an upper end of the telescopic rod 61 being fixed on the support 50 to drive the support 50 to move in the up-down direction. Therefore, the cylinder can be controlled through an external pneumatic valve to adjust the position of the support 50, the support 50 does not need to be manually controlled to move, the direct contact of an operator with the heating element 40 is avoided, and the safety is high; in addition, the upper end of the telescopic rod 61 can support and position the support 50, so that the size of the gap 31 is prevented from changing in the embossing process, and the embossing precision is ensured.

In some embodiments of the present invention, as shown in fig. 1, the film embossing apparatus 1 further includes: a fine adjustment device. The fine adjustment device is arranged on the base 10 and comprises an indicating instrument 71 and a screw 72, and the screw 72 is in transmission connection with the support 50 to adjust the position of the support 50.

Specifically, a mounting plate 13 is provided above the stand 50, the mounting plate 13 is mounted on the base 10, and the indicating gauge 71 and the screw 72 are respectively mounted on the mounting plate 13. The indicating instrument 71 may be a dial gauge which indicates the magnitude of the gap 31. The assembly plate 13 is provided with a screw hole, the upper end of the screw rod 72 is matched in the screw hole, and the lower end of the screw rod 72 is in transmission connection with the support 50. In this way, by adjusting the position of the seat 50 by rotating the screw 72, the position of the seat 50 can be defined, so that the gap 31 between the embossing roller 20 and the bottom roller 30 can be precisely controlled with high precision.

Alternatively, as shown in fig. 6, the upper end surface of the holder 50 is notched, and the assembly bearing 14 is mounted in the notch, and the screw 72 is rotatably fitted in the assembly bearing 14. When the screw 72 is rotated clockwise to push against the support 50, the lower end of the screw 72 extends into the notch and is matched with the assembly bearing 14, and the lower end of the screw 72 pushes the support 50 to move downwards; when the screw 72 is rotated in the counterclockwise direction to retract the lower end of the screw 72, the lower end of the screw 72 can be disengaged from the assembly bearing 14, and at this time, due to the presence of the air cylinder, the telescopic rod 61 can push up the support 50 to move the support 50 upward, so that the support 50 is pushed up against the lower end of the screw 72, and the lower end of the screw 72 is continuously engaged in the assembly bearing 14. In this way, the assembly bearing 14 can ensure flexible rotation of the screw 72, and can avoid accuracy errors due to direct rotation and friction of the screw 72 with the mount 50.

Further, as shown in fig. 6, the pitch of the screw 72 is a specific pitch so as to satisfy the fine adjustment of the gap 31, and the adjustment accuracy of the screw 72 is less than 0.001 mm. Thus, the accuracy is higher.

According to some embodiments of the present invention, as shown in fig. 10 and 11, the height of the protrusions 21 in the radial direction of the embossing wheel 20 is 1mm to 2mm, the diameter or the side length of the bottom end of the protrusions 21 is 0.1mm to 0.12mm, and the distance between the central axes of two adjacent protrusions 21 is 1 times to 2 times the diameter or the side length of the bottom end of the protrusion 21. For example, the protrusion 21 has a conical shape or a pyramidal shape, and the top end surface of the protrusion 21 is a spherical surface or a flat surface. Thus, the embossing effect can be further improved, and the thickening effect is more obvious.

The operation of the film embossing apparatus 1 according to one embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 12, in the present embodiment, the screw 72 is rotated in the counterclockwise direction to retract the lower end of the screw 72. And opening an external air circuit control valve, controlling the cylinder to push the support 50 to move upwards, enabling the roller to be in contact with the bottom wheel 30, rotating the pointer of the dial indicator to a zero position, and enabling the cylinder to play a role in resetting and zeroing. After zeroing, the screw 72 is rotated in a clockwise direction, the lower end of the screw 72 abuts and drives the seat 50 to move downwards, thereby adjusting the gap 31 to a suitable value. The film 2 is run by threading the film 2 into the gap 31 and adjusting the heating member 40 to a suitable temperature to run the film 2 to produce the film 2 with the embossed band. Wherein, the thickness of the embossing belt is 5 μm-20 μm larger than the thickness of the film 2, the thickening thickness of the embossing belt can be controlled by adjusting the size of the gap 31, and the size of the gap 31 and the heating temperature need to be adjusted according to the type of the film 2.

Other configurations and operations of the film embossing apparatus 1 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

As shown in fig. 1 to 12, a film preparation apparatus according to an embodiment of the second aspect of the present invention includes a film embossing apparatus 1 according to an embodiment of the first aspect of the present invention.

According to the film preparation device provided by the embodiment of the utility model, by utilizing the film embossing device 1, the generation of dust in the preparation process of the film 2 can be avoided, the apparent quality of the film 2 is ensured, the generation of the internal stress of the film can be avoided, the deformation of warping and the like of the thickened part of the film 2 is prevented, and the rolling quality of the film 2 is ensured; in addition, in the process of rolling the film 2, an effective interval can be supported between the two adjacent layers of films 2, direct contact between the two adjacent layers of films 2 is avoided, and the films 2 are prevented from being adhered, bulged and scratched.

Other configurations and operations of the thin film formation apparatus according to embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, "first feature" and "second feature" may include one or more of the features, and the first feature may be "on" or "under" the second feature, and may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween. The first feature being "on," "over" and "above" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

It is to be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A film embossing apparatus, comprising:

a base;

the embossing wheel is rotatably arranged on the base, a plurality of protrusions are arranged on the outer peripheral surface of the embossing wheel, the protrusions are distributed at intervals along the axial direction and the circumferential direction of the embossing wheel respectively, and the embossing wheel is provided with a heating cavity;

the bottom wheel is rotatably arranged on the base and positioned on the outer side of the embossing wheel, the rotating axis of the bottom wheel is parallel to that of the embossing wheel, and one part of the outer peripheral surface of the bottom wheel is opposite to the plurality of protrusions;

and the heating element is used for heating the embossing wheel and is arranged in the heating cavity.

2. The film embossing apparatus as set forth in claim 1, wherein said heating element is mounted on said base by a mounting bracket and spaced from an inner wall of said heating cavity.

3. The film embossing apparatus as set forth in claim 1, wherein at least one of said embossing wheel and said bottom wheel is movable relative to said base to adjust a gap between said embossing wheel and said bottom wheel.

4. The film embossing apparatus as set forth in claim 1, further comprising:

the support, the pedestal mounting just has the rotation chamber on the base, it is equipped with the pivot to rotate the intracavity, the knurling wheel is rotationally installed the one end of pivot.

5. The film embossing apparatus as set forth in claim 4, wherein said holder is provided with heat dissipating holes communicating with said rotating cavity.

6. The film embossing apparatus as set forth in claim 4, wherein said base is provided with a slide rail, and said support is movably engaged with said slide rail.

7. The film embossing apparatus as set forth in claim 6, further comprising:

the driving device is installed on the base and is in transmission connection with the support so as to drive the support to move.

8. The film embossing apparatus as set forth in claim 6, further comprising:

the fine adjustment device is installed on the base and comprises an indicating instrument and a screw rod, and the screw rod is in transmission connection with the support so as to adjust the position of the support.

9. The film embossing device as claimed in any one of claims 1 to 8, wherein the height of the protrusions in the radial direction of the embossing wheel is 1mm to 2mm, the diameter or side length of the bottom end of the protrusion is 0.1mm to 0.12mm, and the distance between the central axes of two adjacent protrusions is 1 to 2 times the diameter or side length of the bottom end of the protrusion.

10. A film preparation apparatus comprising the film embossing apparatus according to any one of claims 1 to 9.