CN215970385U

CN215970385U - A film structure and photocuring 3D printer for photocuring 3D prints

Info

Publication number: CN215970385U
Application number: CN202121093176.8U
Authority: CN
Inventors: 林泽航; 李厚民
Original assignee: Shenzhen Yuze Technology Co ltd
Current assignee: Youyouzao Technology Beijing Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-03-08
Anticipated expiration: 2031-05-20

Abstract

The application discloses a film structure and photocuring 3D printer for photocuring 3D prints. The film structure has unequal release forces in different areas and in the same unit area. The application provides a film structure for with photosensitive resin contact, can be applied to photocuring 3D and print, and make the forming object at the in-process of peeling off from this film structure, can accomplish the action of peeling off through exerting less peeling off pulling force and carrying out shorter leaving type stroke, thereby do benefit to the peeling off speed who accelerates the forming object, promote photocuring 3D printing speed.

Description

A film structure and photocuring 3D printer for photocuring 3D prints

Technical Field

The application relates to the field of 3D printing, in particular to a film structure for photocuring 3D printing.

Background

In the field of 3D (Three Dimensional) printing, rapid prototyping techniques can be classified into various categories according to the material used and the manner of prototyping, and photocuring rapid prototyping is more common. The principle of photocuring forming is as follows: the characteristic that the photosensitive resin in a fluid state is subjected to polymerization reaction under illumination is utilized, and a light source is irradiated according to the cross section shape of an object to be formed, so that the resin in the fluid state is cured and formed.

In the related art, a photocuring 3D printer irradiates a cross-sectional pattern of a 3D printing object to a liquid photosensitive resin through a data transmission device by means of laser scanning, projector projection, or LCD mask illumination, and the like, through a specific wavelength. The liquid photosensitive resin is solidified on one side of the release film far away from the light source, is permanently bonded with the forming table or the forming object, and is temporarily bonded with the release film. When the forming table drives the formed object (namely the cured photosensitive resin) to leave the release film, the formed object can be peeled from the release film without damage, thereby completing the release printing process once. And after the stripping is finished, the forming table descends, a layer thickness distance is reserved between the cured object and the release film, curing exposure and stripping of next layer printing are carried out, and the printing process is finished in a reciprocating mode.

However, in the conventional release film, when the molded article (i.e., the cured photosensitive resin) is peeled from the release film, the release force applied to the release film is uniform, and the magnitude of the release force is proportional to the cross-sectional area of the molded article. If the cross-sectional area of the molded product becomes larger, the release force of the release film increases. A greater peeling tension is required to peel the molded article from the release film. In order to apply a larger peeling tension, the stroke distance needs to be increased in the peeling process of the formed object, thereby increasing the time of the peeling process and reducing the 3D printing speed. If the printing speed is forcibly increased, the release film will be damaged due to the excessive release force, thereby causing printing failure.

Disclosure of Invention

In order to solve or partially solve the problems existing in the related art, the application provides a film structure for photocuring 3D printing, which can improve the 3D printing speed.

The application provides a film structure for photocuring 3D prints in a first aspect, the film structure is in the same unit area on different regions from type force inequality.

In one embodiment, the thin film structure comprises: at least one release film;

the at least one release film comprises: a layer of release film; the thickness of the release film in a preset area is different from that of the release film in a non-preset area; or

The at least one release film comprises: at least two layers of release films; wherein each release film in the at least two layers of release films is stacked in sequence; in two adjacent from the type membrane, one from the predetermined connection region on one side surface of type membrane and another from the predetermined connection region on one side surface of type membrane interconnect.

In one embodiment, the thickness of the release film in the preset region is different from the thickness of the release film in the non-preset region, and the method comprises the following steps:

the preset area of the release film is divided into a plurality of sub preset areas, and the thickness of each sub preset area of the release film is different.

one surface of the release film, which is used for contacting with the photosensitive resin, is positioned on the same horizontal plane; or the like, or, alternatively,

one surface of the release film, which is back to the photosensitive resin, is positioned on the same horizontal plane; or the like, or, alternatively,

the surface of the release film, which is used for contacting with the photosensitive resin, and the surface back to the photosensitive resin are not on the same horizontal plane.

the area of the release film in the preset area is different from the area of the release film in the non-preset area.

In one embodiment, in two adjacent release films, a predetermined connection region on one side surface of one release film is connected to a predetermined connection region on one side surface of the other release film, and the method includes:

in two adjacent release films, a preset connecting area on one side surface of one release film is welded or bonded with a preset connecting area on one side surface of the other release film.

the surface of one side of the release film is provided with at least two preset connecting areas, and the at least two preset connecting areas are distributed on the surface of one side of the release film according to a preset distribution rule; and each preset connecting area on one side surface of the release film is correspondingly connected with one preset connecting area on one side surface of the other release film.

In one embodiment, each of the at least two release films is stacked in sequence, comprising:

and one layer of the at least two layers of release films, which is far away from the photosensitive resin, is a rigid structure plane plate.

the thickness of the release film on the outermost layer of the at least two layers of release films in the preset area is different from the thickness of the release film in the non-preset area.

A second aspect of the application provides a photocuring 3D printer, comprising a thin-film structure as described above.

The technical scheme provided by the application can comprise the following beneficial effects:

the thin film structure provided by the embodiment of the application can be used for being in contact with photosensitive resin in the photocuring 3D printing process. When the molding material (cured photosensitive resin) is peeled off from the surface of the film structure, because the release forces of the film structure in different areas are different, the surface of the film structure cannot form an integral release force, the integral release force applied to the surface of the film structure contacting the photosensitive resin is dispersed, and the film structure is subjected to different release forces in different areas. Because the size of the release force is in direct proportion to the contact area, the release force correspondingly applied to each region of the film structure is smaller than the integral release force. When the stress of one of the areas on the film structure reaches the release force corresponding to the area, the part of the forming object corresponding to the area is peeled off. Thus, during the stripping movement, the formed object will be sequentially stripped from different areas of the surface of the film structure. Thus, even if the cross-sectional area of the molded product is increased, the peeling action does not need to be completed by increasing the peeling tension and the releasing stroke, and the peeling tension is larger than the releasing force of each area in the film structure. That is to say, can accomplish the action of peeling off through exerting less peeling off pulling force and carrying out shorter type stroke to do benefit to the peeling off speed that accelerates the forming material, promote photocuring 3D printing speed.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

Fig. 1 is a schematic structural diagram of a thin film structure for photocuring 3D printing shown in an embodiment of the present application;

fig. 2 is a schematic cross-sectional structural diagram of a thin-film structure for photocuring 3D printing shown in an embodiment of the present application;

FIG. 3 is another schematic cross-sectional structure diagram of a thin-film structure for photocuring 3D printing shown in an embodiment of the present application;

FIG. 4 is another schematic cross-sectional structure diagram of a thin-film structure for photocuring 3D printing shown in an embodiment of the present application;

FIG. 5 is a schematic cross-sectional structural view of a thin-film structure for photocuring 3D printing shown in another embodiment of the present application;

FIG. 6 is another schematic cross-sectional structure diagram of a thin-film structure for photocuring 3D printing shown in an embodiment of the present application;

FIG. 7 is another schematic cross-sectional structure diagram of a thin-film structure for photocuring 3D printing shown in an embodiment of the present application;

fig. 8 is a schematic flowchart of a method for manufacturing a thin film structure for photocuring 3D printing according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. 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 application, "a plurality" means two or more unless specifically limited otherwise.

In the related art, for the current release film, when the formed product (i.e. the cured photosensitive resin) is peeled off from the release film, the release force applied to each part of the release film is uniform, and the magnitude of the release force is proportional to the cross-sectional area of the formed product. If the cross-sectional area of the molded product becomes larger, the release force of the release film increases. A greater peeling tension is required to peel the molded article from the release film. In order to apply a larger peeling tension, the stroke distance needs to be increased in the peeling process of the formed object, thereby increasing the time of the peeling process and reducing the 3D printing speed. If the printing speed is forcibly increased, the release film will be damaged due to the excessive release force, thereby causing printing failure.

To the above problem, the embodiment of the application provides a film structure for photocuring 3D printing, can promote 3D printing speed.

The embodiment of the application provides a film structure for photocuring 3D printing, and the release force of the film structure on different regions in the same unit area is unequal.

In the field of 3D printing, the release force is a force required to peel a molded product (cured photosensitive resin) from the surface of a release film. In the related art, when the molding material is attached to the surface of the conventional release film, the molding material is subjected to the release force of the conventional release film, so that the molding material is attached to the surface of the conventional release film. When the peeling tension on the molded object reaches the releasing force of the conventional release film, the molded object is peeled from the surface of the conventional release film. The tradition is in proportion from type force that the type membrane received and the cross sectional area of forming object, and the cross sectional area of forming object is big more, and tradition is just also big more from type force that the type membrane received to tradition only receives a holistic from type force from the type membrane, when the tensile size of peeling off that forms the thing reached tradition from the whole size of type force from the type membrane, all contact points on forming object surface leave from the type membrane from the tradition simultaneously. For the thin film structure of the present application, the release forces of the thin film structure in different regions are different, that is, different regions of the thin film structure respectively bear different release forces. When the stress of one of the areas on the film structure reaches the release force corresponding to the area, the part of the forming object corresponding to the area is peeled off. As the peeling action progresses, the formed object will peel off from different areas of the surface of the film structure in sequence.

It can be understood that the magnitude of the release force is proportional to the magnitude of the contact surface. For the same cross-sectional area of the molded object, the maximum value of the overall release force of the conventional release film is necessarily greater than the maximum value of the release force of any region of the film structure of the present application. Therefore, for stripping the formed objects with the same section size, by applying the thin film structure, the stripping action can be completed by applying smaller stripping pulling force and executing shorter stripping stroke, so that the stripping speed of the formed objects is increased, and the photocuring 3D printing speed is increased.

Referring to fig. 1 to 7 together, in the embodiment of the present application, the film structure 10 includes at least one release film 100.

The at least one release film 100 may include: a release film 100. Wherein, the thickness of the release film 100 in the predetermined area 110 is different from the thickness of the release film 100 in the non-predetermined area 120. The release film 100 may have a plurality of preset regions 110, and the thicknesses of the preset regions 110 on the release film 100 may be different or different from each other. The release film 100 may also have a plurality of non-predetermined regions 120, and the thickness of the plurality of non-predetermined regions 120 on the release film 100 may be different or different from each other. Because the release force of the thin film structure 10 in the preset region 110 is not equal to the release force of the thin film structure 10 in the non-preset region 120 in the same unit area, the thin film structure 10 bears one release force in the preset region 110, and the thin film structure 10 bears the other release force in the non-preset region 120, so that the overall release force borne by the surface of the thin film structure 10 is dispersed, and the surface of the thin film structure 10 bears the gradient release force (or called non-uniform release force). During the peeling of the form from the film structure 10, the predetermined regions 110 and the non-predetermined regions 120 of the film structure 10 will be removed from the form surface.

Further, in a specific embodiment, the preset area 110 of the release film 100 is divided into a plurality of sub-preset areas, and the thicknesses of the sub-preset areas of the release film 100 are different. The plurality of sub-preset regions can be communicated adjacently, and the plurality of sub-preset regions can also be distributed in a scattered manner. In some embodiments, the plurality of sub-predetermined regions may include a first sub-predetermined region, a second sub-predetermined region and a third sub-predetermined region, and the thicknesses of the release film 100 in the first sub-predetermined region, the second sub-predetermined region and the third sub-predetermined region are different and may decrease sequentially. Specifically, the thickness of the non-preset region 120 of the release film 100 may be the largest, and is greater than the thicknesses of the release film 100 in the first sub-preset region, the second sub-preset region and the third sub-preset region, respectively. Thus, the thin film structure 10 is subjected to the release forces of 4 in the non-predetermined region 120, the first sub-predetermined region, the second sub-predetermined region and the third sub-predetermined region, respectively. It can be understood that, through dividing the preset area 110 of the release film 100 into a plurality of sub preset areas, and the thickness of each sub preset area of the release film 100 is different, the release film 100 itself can be caused to have macroscopic unevenness, so that when the formed object is peeled off from the thin film structure 10, the surface of the thin film structure 10 presents nonuniform release force distribution, and then the speed of photocuring 3D printing can be remarkably improved, and the printing stability and success rate are improved.

The shape of the predetermined region 110 of the release film 100 may be a matrix, a triangle, or other irregular figures. Similarly, the shape of the sub-predetermined region of the release film 100 may also be a matrix, a triangle, or other irregular figure. The shape of the predetermined region 110 and the shape of the sub-predetermined region of the release film 100 can be set according to practical applications, and are not limited herein.

Further, referring to fig. 2 to 4, in one embodiment, a surface of the release film 100 for contacting the photosensitive resin may be on the same horizontal plane. In another embodiment, the side of the release film 100 facing away from the photosensitive resin is on the same horizontal plane. In other embodiments, the side of the release film 100 that is used to contact the photosensitive resin and the side that faces away from the photosensitive resin are not all at the same level. That is to say, the surface of the thin film structure 10 contacting the formed object may be a flat surface, or may be an uneven surface, and the thickness of the release film 100 in the preset region 110 is different from the thickness of the release film 100 in the non-preset region 120, i.e. a non-uniform release force distribution may be present, so that the thin film structure 10 is subjected to different release forces in different regions, thereby facilitating the improvement of the peeling speed of the formed object and the speed of the photocuring 3D printing.

Further, the area of the release film 100 in the predetermined region 110 may be different from the area of the release film 100 in the non-predetermined region 120. The area within the preset region 110 of the release film 100 may be greater than or less than the area within the non-preset region 120 of the release film 100. The area within the predetermined region 110 of the release film 100 may also be equal to the area within the non-predetermined region 120 of the release film 100. The areas of the sub-predetermined regions in the predetermined region 110 of the release film 100 may also be different. That is to say, on the premise that the thickness of the preset region 110 of the release film 100 is different from the thickness of the non-preset region 120 of the release film 100, the area of the non-preset region 120 and the area of each sub-preset region in the preset region 110 can be set as required, so as to be suitable for different use occasions.

Referring to fig. 5 and 6, at least one release film 100 may also include: at least two layers of release film 100. Wherein each release film 100 of the at least two release films 100 is sequentially stacked. In two adjacent release films 100, the predetermined connection region 130 of one side surface of one release film 100 is connected to the predetermined connection region 130 of one side surface of the other release film 100. For example, the at least two release films 100 include a first release film 100 and a second release film 100, and the predetermined connection region 130 of one side surface of the first release film 100 and the predetermined connection region 130 of one side surface of the second release film 100 are connected to each other. For another example, the at least two release films 100 include a first release film 100, a second release film 100 and a third release film 100, the predetermined connection region 130 of one side surface of the first release film 100 is connected to the predetermined connection region 130 of one side surface of the second release film 100, and the predetermined connection region 130 of one side surface of the second release film 100 is connected to the predetermined connection region 130 of one side surface of the third release film 100.

The predetermined connecting region 130 on one side surface of one release film 100 can be welded, adhered, or thermally fused to the predetermined connecting region 130 on one side surface of the other release film 100, so as to ensure the firmness of the connection. The shape of the predetermined connection region 130 of the release film 100 may be a matrix, a triangle, or other irregular figures.

Wherein an outermost release film 100 of the at least two release films 100 may be brought into contact with the photosensitive resin. In the process of peeling the molded object from the surface of the delamination type film 100 after the photosensitive resin is cured, the release force per unit area of the delamination type film 100 in the predetermined connection region 130 is not equal to that in the non-predetermined connection region 140. The release force is applied to one of the predetermined connection regions 130 and the other of the non-predetermined connection regions 140, so that the overall release force applied to the surface of the delamination film 100 is dispersed, and the surface of the delamination film 100 is applied with a gradient release force (or non-uniform release force).

In the process of peeling the molded product from the surface of the outermost release film 100 in the film structure 10, the predetermined connection region 130 of the outermost release film 100 is subjected to the bonding force (pulling force due to the connection) of the adjacent release films 100, so that the predetermined connection region 130 of the outermost release film 100 is subjected to the largest release force, and the predetermined connection region 130 of the outermost release film 100 is peeled from the surface of the molded product first. The non-preset connection region 140 of the outermost release film 100 is not connected to the adjacent release film 100, and the adjacent release film 100 does not generate a bonding force corresponding to the non-preset connection region 140, so that the surface of the non-preset connection region 140 of the outermost release film 100 is subjected to a small release force, and the surface of the non-preset connection region 140 of the outermost release film 100 is tightly attached to the surface of the molded object. When the prearranged connection area 130 of the outermost release film 100 is peeled from the surface of the molded object, the non-prearranged connection area 140 of the outermost release film 100 is peeled from the surface of the molded object.

Further, in one embodiment, the release film 100 has at least two preset connection regions 130 on one side surface thereof, and the at least two preset connection regions 130 are distributed on one side surface of the release film 100 according to a preset distribution rule; each predetermined connection region 130 of one side surface of one release film 100 is correspondingly connected to a predetermined connection region 130 of one side surface of the other release film 100. Thus, the surface of the release film 100 contacting the molding will have a distribution of a plurality of release points, and each pre-connection region 130 of the release film 100 will be simultaneously peeled from the surface of the molding, and then each non-pre-connection region 140 of the release film 100 will be simultaneously peeled from the surface of the molding.

Further, in one embodiment, the thickness of the outermost release film 100 of the at least two release films 100 in the preset area 110 is different from the thickness of the outermost release film 100 in the non-preset area 120. Like this, further make film structure 10 whole possess macroscopic inhomogeneity to when making the forming matter peel off from film structure 10, film structure 10 surface presents inhomogeneous from the type force distribution, and then can show the speed that promotes photocuring 3D and print, improve the stability and the success rate of printing simultaneously.

Further, in one of the embodiments, among the at least two layers of release film 100, the layer of release film 100 away from the photosensitive resin may be a rigid structural flat plate 101. Referring to fig. 7, for example, at least two release films 100 include two release films 100, and a predetermined connection region 130 on one side surface of one release film 100 is connected to a predetermined connection region 130 on one side surface of the other release film 100. One of the release films 100 is used to contact the photosensitive resin, and the other release film 100 is a rigid structural flat plate 101. The rigid structural panel 101 may be a glass panel, among others. Like this, the forming object is at the stripping process, and under the connection effect of rigid structure plane board 101, can not be dragged from the connection area 130 of predetermineeing of type membrane 100 and be out of shape, and the atress of predetermineeing connection area 130 from type membrane 100 that contacts with the forming object is the biggest to make the forming object peel off from the connection area 130 of predetermineeing from type membrane 100 earlier, realize this non-uniformity from type force distribution from type membrane 100 surface, thereby do benefit to the speed that promotes photocuring 3D and print.

Corresponding to the foregoing embodiments, the present application further provides an embodiment of a method for manufacturing a thin film structure for photocuring 3D printing.

Referring to fig. 8, the manufacturing method includes:

step S801, preparing at least one release film.

Step S802, when the at least one release film comprises one release film, thinning or thickening a preset area of the release film.

In this step, the specific manner of thinning or thickening the preset region of the release film includes: mechanically thinning a preset area of the release film; or, carrying out laser thinning on a preset area of the release film; or chemically thinning a preset area of the release film; or, pattern loading is carried out on the preset area of the release film, so that the thickness of the preset area and the thickness of the non-preset area of the release film are different.

Further, in this step, different regions of the predetermined region of the release film may be thinned or thickened to different thicknesses, respectively. For example, the preset region may be divided into a plurality of sub-preset regions, and the thickness of the release film in each sub-preset region is different by mechanical thinning, laser thinning, chemical thinning or pattern loading.

Further, in this step, a side of the release film to be in contact with the photosensitive resin is on the same level; or, the surface of the release film back to the photosensitive resin is positioned on the same horizontal plane; or the surface of the release film, which is used for contacting with the photosensitive resin, and the surface of the release film, which faces away from the photosensitive resin, are not on the same horizontal plane. Furthermore, the area of the preset area of the release film can be different from the area of the non-preset area of the release film, and the area of each sub-preset area of the release film can also be different.

Step S803, when the at least one release film includes at least two release films, stacking the release films in sequence.

Wherein an outermost one of the release films in each of the release films stacked in sequence is adapted to be in contact with the photosensitive resin.

Step S804, connecting the preset connection region of one release film of the two adjacent release films with the preset connection region of the other release film.

In this step, one side surface of the release film may have at least two preset connection regions, and the at least two preset connection regions are distributed on one side surface of the release film according to a preset distribution rule; each preset connecting area on one side surface of one release film is correspondingly connected with one preset connecting area on one side surface of the other release film.

In this step, the predetermined connection region of one release film may be welded, bonded, or thermally fused to the predetermined connection region of another release film.

After step S804 is performed, step S805 may be optionally performed.

Step S805, thinning or thickening a preset region of an outermost release film of the at least two release films.

In this step, the preset area of a release film on the outermost side is thinned or thickened, so that the release film has macroscopic unevenness, and when the formed object is peeled off from the film structure, the surface of the film structure is in uneven release force distribution, the speed of photocuring 3D printing can be obviously improved, and the printing stability and success rate are improved.

According to the method provided by the embodiment of the application, at least one release film is prepared to manufacture the film structure for photocuring 3D printing. When the at least one release film comprises one release film, the preset area of the release film is thinned or thickened, so that the film structure with unequal release force in the same unit area in areas with different thicknesses is prepared. When at least one release film comprises at least two release films, the release films are sequentially stacked, and then the preset connecting region of one release film in two adjacent release films is connected with the preset connecting region of the other release film, so that the film structure with unequal release force in the same unit area of the preset connecting region and the non-preset connecting region is manufactured. In the photocuring 3D printing process, the film structure can be used for being in contact with photosensitive resin, when a formed object (cured photosensitive resin) is stripped from the surface of the film structure, the overall release force applied to the surface of the film structure in contact with the photosensitive resin can be dispersed, and the film structure can be applied to different release forces in different areas. Because the size of the release force is in direct proportion to the contact area, the release force correspondingly applied to each region of the film structure is smaller than the integral release force. When the stress of one of the areas on the film structure reaches the release force corresponding to the area, the part of the forming object corresponding to the area is peeled off. Thus, during the stripping movement, the formed object will be sequentially stripped from different areas of the surface of the film structure. Thus, even if the cross-sectional area of the molded product is increased, the peeling action does not need to be completed by increasing the peeling tension and the releasing stroke, and the peeling tension is larger than the releasing force of each area in the film structure. That is to say, can accomplish the action of peeling off through exerting less peeling off pulling force and carrying out shorter type stroke to do benefit to the peeling off speed that accelerates the forming material, promote photocuring 3D printing speed.

The above embodiment introduces the film structure for photocuring 3D printing provided by the embodiment of the present application, and accordingly, the present application further provides a photocuring 3D printer, and the photocuring 3D printer provided by the present embodiment includes the film structure described in any of the above embodiments.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A film structure for photocuring 3D printing is characterized in that the release forces of the film structure in different areas are different in the same unit area;

the thin film structure includes: at least one release film;

2. The film structure of claim 1, wherein the thickness of the release film in the predetermined region is different from the thickness of the release film in the non-predetermined region, and comprises:

3. The film structure of claim 1, wherein the thickness of the release film in the predetermined region is different from the thickness of the release film in the non-predetermined region, and comprises:

4. The film structure of claim 1, wherein the thickness of the release film in the predetermined region is different from the thickness of the release film in the non-predetermined region, and comprises:

5. The film structure according to claim 1, wherein the predetermined connecting region of one side surface of one of the release films and the predetermined connecting region of one side surface of the other of the release films are connected to each other in two adjacent release films, and comprises:

6. The film structure according to claim 1, wherein the predetermined connecting region of one side surface of one of the release films and the predetermined connecting region of one side surface of the other of the release films are connected to each other in two adjacent release films, and comprises:

7. The film structure of claim 1, wherein each of the at least two release films is stacked in sequence, comprising:

8. The film structure of claim 1, wherein each of the at least two release films is stacked in sequence, comprising:

9. The utility model provides a photocuring 3D printer which characterized in that: comprising a film structure according to any one of claims 1 to 8.