Film Structure for Stereolithography 3D Printing and Its Manufacturing Method

Abstract

This application relates to a film structure for photocuring 3D printing and a manufacturing method thereof. The release force per unit area of the film structure is not equal in different regions. The film structure provided in this application is used to contact with photosensitive resin, can be applied to photocuring 3D printing, and enables the formed object to complete the peeling action by applying a smaller peeling force and performing a shorter release stroke during the peeling process from the film structure, thereby facilitating the acceleration of the peeling speed of the formed object and improving the photocuring 3D printing speed.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and particularly to a film structure for stereolithography 3D printing and a manufacturing method thereof. Background Art

[0002] In the field of 3D (Three Dimensional) printing, according to different materials used and forming methods, rapid prototyping technologies can be classified into various categories, among which stereolithography is relatively common. The principle of stereolithography is: using the characteristic that a fluid photosensitive resin undergoes a polymerization reaction under light irradiation, irradiating a light source according to the cross-sectional shape of an object to be formed, so that the fluid resin is cured and formed.

[0003] In related technologies, a stereolithography 3D printer irradiates a cross-sectional pattern of a 3D printing object through a specific wavelength to a liquid photosensitive resin by means of laser scanning, projector projection, or LCD mask illumination, etc. through a data transmission device. The liquid photosensitive resin is cured on the side of the release film away from the light source, and is permanently bonded to the forming table or the formed object, and is temporarily adhered to the release film. When the forming table drives the formed object (i.e., the cured photosensitive resin) away from the release film, the formed object can be peeled off from the release film without damage, thus completing a single release printing process. After the peeling is completed, the forming table descends, leaving a layer thickness distance between the cured object and the release film, and performing curing exposure and peeling for the next layer of printing, and so on to complete the printing process.

[0004] However, for the current release film, when the formed object (i.e., the cured photosensitive resin) is peeled off from the release film, the release force received by 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 object. If the cross-sectional area of the formed object becomes larger, the release force of the release film increases. Then a greater peeling pulling force needs to be applied to peel the formed object from the release film. In order to apply a greater peeling pulling force, during the peeling process of the formed object, the stroke distance needs to be increased, 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 excessive release force, resulting in printing failure. Summary of the Invention

[0005] To solve or partially solve the problems existing in related technologies, the present application provides a film structure for stereolithography 3D printing and a manufacturing method thereof, which can improve the 3D printing speed.

[0006] In a first aspect of the present application, a film structure for stereolithography 3D printing is provided, and the release force per unit area of the film structure in different regions is not equal.

[0007] In an embodiment, the film structure includes: at least one release film;

[0008] The at least one release film includes: one release film; wherein, the thickness of the release film in a preset area is different from the thickness of the release film in a non-preset area; or

[0009] The at least one release film includes: at least two release films; wherein, the release films are stacked in sequence; in two adjacent release films, a preset connection area on one side surface of one release film is connected to a preset connection area on one side surface of the other release film.

[0010] In one embodiment, the thickness of the release film in a preset area being different from the thickness of the release film in a non-preset area includes:

[0011] The preset area of the release film is divided into a plurality of sub-preset areas, and the thicknesses of the respective sub-preset areas of the release film are different.

[0012] In one embodiment, in two adjacent release films, a preset connection area on one side surface of one release film being connected to a preset connection area on one side surface of the other release film includes:

[0013] One side surface of the release film has at least two preset connection areas, and the at least two preset connection areas are distributed on one side surface of the release film according to a preset distribution rule; each preset connection area on one side surface of one release film is correspondingly connected to a preset connection area on one side surface of the other release film.

[0014] A second aspect of the present application provides a method for manufacturing a thin film structure for photocuring 3D printing, including:

[0015] Preparing at least one release film;

[0016] When the at least one release film includes one release film, thinning or thickening the preset area of the release film;

[0017] When the at least one release film includes at least two release films, stacking the release films in sequence; connecting a preset connection area of one release film in two adjacent release films to a preset connection area of the other release film.

[0018] In one embodiment, thinning or thickening the preset area of the release film includes:

[0019] Mechanically thinning the preset area of the release film; or,

[0020] Laser thinning the preset area of the release film; or,

[0021] Chemically thin the preset area of the release film; or,

[0022] Perform pattern loading on the preset area of the release film.

[0023] In one embodiment, the thinning or thickening of the preset area of the release film includes:

[0024] Thin or thicken different areas in the preset area of the release film to different thicknesses.

[0025] In one embodiment, the connection of the preset connection area of one release film in two adjacent release films to the preset connection area of the other release film includes:

[0026] Weld or bond the preset connection area of one release film in two adjacent release films to the preset connection area of the other release film.

[0027] In one embodiment, after connecting the preset connection area of one release film in two adjacent release films to the preset connection area of the other release film, it includes:

[0028] Thin or thicken the preset area of the outermost release film among the at least two release films.

[0029] The third aspect of the present application provides a photocuring 3D printer, including the thin film structure as described above.

[0030] The technical solution provided by the present application may include the following beneficial effects:

[0031] The thin film structure provided by the embodiments of the present application can be used to contact with photosensitive resin during the photocuring 3D printing process. When the formed object (cured photosensitive resin) is peeled off from the surface of the thin film structure, since the release forces per unit area of the thin film structure in different regions are not equal, a unified release force cannot be formed on the surface of the thin film structure, and the overall release force received by the surface of the thin film structure in contact with the photosensitive resin will be dispersed, and different release forces will act on different regions of the thin film structure. Since the magnitude of the release force is proportional to the contact area, the release force corresponding to each region of the thin film structure will be smaller than the above-mentioned overall release force. When the force on one of the regions of the thin film structure reaches the release force corresponding to that region, the corresponding part of the formed object will be peeled off. In this way, during the peeling movement of the formed object, the formed object will be peeled off from different regions of the surface of the thin film structure in sequence. In this way, even if the cross-sectional area of the formed object increases, it is not necessary to increase the peeling tension and the release stroke to complete the peeling action, as long as the peeling tension is greater than the release force of each region in the thin film structure. That is to say, the peeling action can be completed by applying a smaller peeling tension and performing a shorter release stroke, which is conducive to accelerating the peeling speed of the formed object and improving the photocuring 3D printing speed.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Description of the Drawings

[0033] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0034] Figure 1 is a schematic structural diagram of the thin film structure for photocuring 3D printing shown in the embodiments of the present application;

[0035] Figure 2 is a schematic cross-sectional structural diagram of the thin film structure for photocuring 3D printing shown in the embodiments of the present application;

[0036] Figure 3 is another schematic cross-sectional structural diagram of the thin film structure for photocuring 3D printing shown in the embodiments of the present application;

[0037] Figure 4 is another schematic cross-sectional structural diagram of the thin film structure for photocuring 3D printing shown in the embodiments of the present application;

[0038] Figure 5 is a schematic cross-sectional structural diagram of the thin film structure for photocuring 3D printing shown in another embodiment of the present application;

[0039] Figure 6 It is another cross-sectional structure schematic diagram of the film structure for photocuring 3D printing shown in the embodiments of the present application;

[0040] Figure 7 It is another cross-sectional structure schematic diagram of the film structure for photocuring 3D printing shown in the embodiments of the present application;

[0041] Figure 8 It is a schematic flow chart of the manufacturing method of the film structure for photocuring 3D printing shown in the embodiments of the present application. Detailed Embodiments

[0042] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0043] The terms used in the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly dictates 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.

[0044] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0045] In the related art, for the current release film, when the formed object (i.e., the cured photosensitive resin) is peeled off from the release film, the release force received by 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 object. If the cross-sectional area of the formed object becomes larger, the release force of the release film increases. Then, a greater peeling tension needs to be applied to peel the formed object from the release film. To apply a greater peeling tension, during the peeling process of the formed object, the stroke distance needs to be increased, 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 excessive release force, resulting in printing failure.

[0046] In view of the above problems, the embodiments of the present application provide a film structure for photocuring 3D printing and a manufacturing method thereof, which can improve the 3D printing speed.

[0047] The embodiments of the present application provide a film structure for photocuring 3D printing, and the release force per unit area of the film structure is not equal in different regions.

[0048] The film structure provided by the embodiments of the present application can be used to contact the photosensitive resin during the photocuring 3D printing process. When the formed object (cured photosensitive resin) is peeled off from the surface of the film structure, since the release force per unit area of the film structure is not equal in different regions, a unified release force cannot be formed on the surface of the film structure, and the overall release force received by the surface of the film structure in contact with the photosensitive resin will be dispersed, and different release forces will act on different regions of the film structure. Since the magnitude of the release force is proportional to the contact area, the release force corresponding to each region of the film structure will be smaller than the above-mentioned overall release force. When the force on one of the regions of the film structure reaches the release force corresponding to that region, the corresponding part of the formed object will be peeled off. In this way, during the peeling movement of the formed object, the formed object will be peeled off from different regions of the surface of the film structure in sequence. In this way, even if the cross-sectional area of the formed object increases, it is not necessary to complete the peeling action by increasing the peeling tension and the release stroke, as long as the peeling tension is greater than the release force of each region in the film structure. That is to say, the peeling action can be completed by applying a smaller peeling tension and performing a shorter release stroke, thereby facilitating the acceleration of the peeling speed of the formed object and improving the photocuring 3D printing speed.

[0049] It should be noted that in the technical field of 3D printing, the release force is the force required for the formed object (cured photosensitive resin) to peel off from the surface of the release film. In the related art, when the formed object is attached to the surface of the traditional release film, the formed object is subjected to the release force of the traditional release film, so that the formed object adheres to the surface of the traditional release film. When the peeling force of the formed object reaches the release force of the traditional release film, the formed object will peel off from the surface of the traditional release film. The release force received by the traditional release film is proportional to the cross-sectional area of the formed object. The larger the cross-sectional area of the formed object, the greater the release force received by the traditional release film. And the traditional release film only receives an overall release force. When the magnitude of the peeling force of the formed object reaches the magnitude of the overall release force of the traditional release film, all the contact points on the surface of the formed object leave the traditional release film simultaneously. For the thin film structure of the present application, since the release forces per unit area of the thin film structure in different regions are not equal, that is, different regions of the thin film structure bear different release forces. When the force on one of the regions of the thin film structure reaches the release force corresponding to that region, the corresponding part of the formed object will be peeled off. As the peeling action progresses, the formed object will be peeled off from different regions on the surface of the thin film structure in sequence.

[0050] It can be understood that the magnitude of the release force is proportional to the size of the contact surface. For the same cross-sectional area of the formed object, the release force of the traditional release film will surely be greater than the release force of any region of the thin film structure of the present application. Thus, for peeling off the formed object with the same cross-sectional size, by applying the above-mentioned thin film structure, the peeling action can be completed by applying a smaller peeling force and performing a shorter release stroke, which is beneficial to accelerating the peeling speed of the formed object and improving the light-curing 3D printing speed.

[0051] Please also refer to Figures 1 to 7 , in the embodiment of the present application, the thin film structure 10 includes at least one layer of release film 100.

[0052] At least one release film 100 may include: one layer of release film 100. Among them, the thickness of the release film 100 within the preset area 110 is different from the thickness of the release film 100 within the non-preset area 120. Among them, multiple preset areas 110 may be provided on the release film 100, and the thicknesses of the multiple preset areas 110 on the release film 100 may be the same or different from each other. Multiple non-preset areas 120 may also be provided on the release film 100, and the thicknesses of the multiple non-preset areas 120 on the release film 100 may also be the same or different from each other. Since the release force per unit area of the thin film structure 10 within the preset area 110 is not equal to that within the non-preset area 120, the thin film structure 10 bears one release force within the preset area 110, and the thin film structure 10 bears another release force within the non-preset area 120, thereby dispersing the overall release force borne on the surface of the thin film structure 10, and the surface of the thin film structure 10 will bear a gradient release force (or non-uniform release force). During the process of peeling the molded object from the thin film structure 10, the parts of the preset area 110 and the non-preset area 120 of the thin film structure 10 will leave the surface of the molded object successively.

[0053] Furthermore, in a specific embodiment, the preset area 110 of the release film 100 is divided into several sub-preset areas, and the thicknesses of the respective sub-preset areas of the release film 100 are different. Among them, several sub-preset areas may be adjacent and connected, and several sub-preset areas may also be distributed dispersedly. In some embodiments, several sub-preset areas may include a first sub-preset area, a second sub-preset area, and a third sub-preset area, and the thicknesses of the release film 100 in the first sub-preset area, the second sub-preset area, and the third sub-preset area are all different and may decrease successively. Specifically, the thickness of the non-preset area 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 area, the second sub-preset area, and the third sub-preset area respectively. In this way, the thin film structure 10 is respectively affected by 4 release forces in the non-preset area 120, the first sub-preset area, the second sub-preset area, and the third sub-preset area. It can be understood that by dividing the preset area 110 of the release film 100 into several sub-preset areas and the thicknesses of the respective sub-preset areas of the release film 100 are different, it can cause the release film 100 itself to have macroscopic non-uniformity, so that when the molded object is peeled from the thin film structure 10, the surface of the thin film structure 10 presents a non-uniform release force distribution, and thus the speed of photocuring 3D printing can be significantly improved, while improving the stability and success rate of printing.

[0054] Among them, the shape of the preset area 110 of the release film 100 may be a matrix, a triangle, or other irregular shapes. Similarly, the shape of the sub-preset area of the release film 100 may also be a matrix, a triangle, or other irregular shapes. The shape of the preset area 110 of the release film 100 and the shape of the sub-preset area can be set according to the actual application situation, and are not limited here.

[0055] Further, please also refer to Figures 2 to 4 , in one embodiment, the surface of the release film 100 that contacts the photosensitive resin can be on the same horizontal plane. In another embodiment, the surface of the release film 100 facing away from the photosensitive resin is on the same horizontal plane. In other embodiments, neither the surface of the release film 100 that contacts the photosensitive resin nor the surface facing away from the photosensitive resin is on the same horizontal plane. That is to say, the surface of the thin film structure 10 in contact with the molded object can be a flat surface or an uneven surface. The thickness of the release film 100 in the preset area 110 is different from the thickness of the release film 100 in the non-preset area 120, so that a non-uniform release force distribution can be presented, enabling the thin film structure 10 to be subjected to different release forces in different areas, thereby facilitating the improvement of the peeling speed of the molded object and the speed of photocuring 3D printing.

[0056] Further, the area of the release film 100 in the preset area 110 can be different from the area of the release film 100 in the non-preset area 120. The area of the release film 100 in the preset area 110 can be larger than or smaller than the area of the release film 100 in the non-preset area 120. The area of the release film 100 in the preset area 110 can also be equal to the area of the release film 100 in the non-preset area 120. The areas of the respective sub-preset areas in the preset area 110 of the release film 100 can also be different. That is to say, on the premise that the thickness of the release film 100 in the preset area 110 is different from the thickness of the release film 100 in the non-preset area 120, the area of the non-preset area 120 and the areas of the respective sub-preset areas in the preset area 110 can be set according to requirements to suit different usage scenarios.

[0057] Please also refer to Figure 5 and Figure 6, at least one release film 100 may also include: at least two release films 100. Among them, the release films 100 of at least two layers are stacked in sequence. In two adjacent release films 100, a preset connection area 130 on one side surface of one release film 100 is connected to a preset connection area 130 on one side surface of the other release film 100. For example, at least two release films 100 include a first release film 100 and a second release film 100, and the preset connection area 130 on one side surface of the first release film 100 is connected to the preset connection area 130 on one side surface of the second release film 100. Another example is that at least two release films 100 include a first release film 100, a second release film 100 and a third release film 100. The preset connection area 130 on one side surface of the first release film 100 is connected to the preset connection area 130 on one side surface of the second release film 100, and the preset connection area 130 on one side surface of the second release film 100 is connected to the preset connection area 130 on one side surface of the third release film 100.

[0058] Among them, the preset connection area 130 on one side surface of one release film 100 can be welded, adhered or heat-melt connected to the preset connection area 130 on one side surface of the other release film 100, etc., to ensure the firmness of the connection. Among them, the shape of the preset connection area 130 of the release film 100 can be a matrix, a triangle or other irregular shapes.

[0059] Among them, the outermost release film 100 of at least two release films 100 can be in contact with the photosensitive resin. After the photosensitive resin is cured, during the process of the molded article being peeled off from the surface of this layer of release film 100, the release force per unit area of this layer of release film 100 within the preset connection area 130 is not equal to that within the non-preset connection area 140. It bears one release force within the preset connection area 130 and another release force within the non-preset connection area 140, thereby dispersing the overall release force borne by the surface of this layer of release film 100, and this layer of release film 100 surface will bear a gradient release force (or called non-uniform release force).

[0060] During the process of the molded object being peeled off from the surface of the outermost release film 100 of the film structure 10, the preset connection area 130 of the outermost release film 100 is subjected to the bonding force (the pulling force generated due to connection) of the adjacent release film 100. Therefore, the release force received by the preset connection area 130 of this layer of release film 100 is the largest, and the preset connection area 130 of this layer of release film 100 is the first to be peeled off from the surface of the molded object. The non-preset connection area 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 corresponding bonding force on the non-preset connection area 140. Therefore, the release force received by the surface of the non-preset connection area 140 of the outermost release film 100 is small, and the surface of the non-preset connection area 140 of the outermost release film 100 closely adheres to the surface of the molded object. When the preset connection area 130 of the outermost release film 100 is peeled off from the surface of the molded object, the non-preset connection area 140 of the outermost release film 100 is then peeled off from the surface of the molded object.

[0061] Furthermore, in one embodiment, at least two preset connection areas 130 are provided on one side surface of the release film 100, and the at least two preset connection areas 130 are distributed on one side surface of the release film 100 according to a preset distribution rule; each preset connection area 130 on one side surface of one release film 100 is correspondingly connected to a preset connection area 130 on one side surface of another release film 100. In this way, there will be multiple release points distributed on the surface of the release film 100 in contact with the molded object, and each preset connection area 130 of this layer of release film 100 will be peeled off from the surface of the molded object simultaneously. Then, each non-preset connection area 140 of this layer of release film 100 will be peeled off from the surface of the molded object simultaneously.

[0062] Furthermore, in one embodiment, the thickness of the outermost release film 100 among at least two layers of release films 100 is different in the preset area 110 and the non-preset area 120. In this way, it further makes the overall film structure 10 macroscopically inhomogeneous, so that when the molded object is peeled off from the film structure 10, the surface of the film structure 10 presents a non-uniform release force distribution, which can significantly improve the speed of photocuring 3D printing, and at the same time improve the printing stability and success rate.

[0063] Furthermore, in one embodiment, among at least two layers of release films 100, the release film 100 away from the photosensitive resin can be a rigid structural flat plate 101. Please refer to Figure 7, for example, at least two release films 100 include two release films 100, and a preset connection area 130 on one side surface of one release film 100 is connected to a preset connection area 130 on one side surface of the other release film 100. Among them, one release film 100 is used to contact the photosensitive resin, and the other release film 100 is a rigid structural flat plate 101. The rigid structural flat plate 101 can be a glass panel. In this way, during the peeling process of the molded object, under the connection action of the rigid structural flat plate 101, the preset connection area 130 of the release film 100 will not be pulled and deformed, and the preset connection area 130 of the release film 100 in contact with the molded object is subjected to the greatest force, so that the molded object is first peeled off from the preset connection area 130 of the release film 100, realizing a non-uniform release force distribution on the surface of the release film 100, thereby facilitating the improvement of the speed of photocuring 3D printing.

[0064] Corresponding to the foregoing embodiments, the present application also provides an embodiment of a method for manufacturing a thin film structure for photocuring 3D printing.

[0065] Figure 8 It is a schematic flowchart of a method for manufacturing a thin film structure for photocuring 3D printing shown in the embodiments of the present application.

[0066] See Figure 8 , and the manufacturing method includes:

[0067] Step S801, prepare at least one release film.

[0068] Step S802, when at least one release film includes one release film, thin or thicken the preset area of the release film.

[0069] In this step, the specific methods for thinning or thickening the preset area of the release film include: mechanically thinning the preset area of the release film; or, laser thinning the preset area of the release film; or, chemically thinning the preset area of the release film; or, loading a pattern on the preset area of the release film, so that the thickness of the preset area of the release film is different from that of the non-preset area.

[0070] Further, in this step, different areas in the preset area of the release film can be thinned or thickened to different thicknesses respectively. For example, the preset area can be divided into several sub-preset areas, and by means of mechanical thinning, laser thinning, chemical thinning or pattern loading, the thickness of the release film in each sub-preset area is made different.

[0071] Further, in this step, the surface of the release film that contacts the photosensitive resin is on the same horizontal plane; or, the surface of the release film that faces away from the photosensitive resin is on the same horizontal plane; or, neither the surface of the release film that contacts the photosensitive resin nor the surface that faces away from the photosensitive resin is on the same horizontal plane. Further, the area within the preset region of the release film can be different from the area within the non-preset region of the release film, and the areas of the respective sub-preset regions within the preset region of the release film can also be different.

[0072] Step S803: When at least one release film includes at least two release films, stack the release films in sequence.

[0073] Among them, the outermost layer of the release films stacked in sequence is used to contact the photosensitive resin.

[0074] Step S804: Connect the preset connection region of one release film to the preset connection region of another release film among two adjacent release films.

[0075] In this step, one side surface of the release film can 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 connection region on one side surface of one release film is correspondingly connected to a preset connection region on one side surface of another release film.

[0076] In this step, the preset connection region of one release film can be welded, bonded, or heat-melted to the preset connection region of another release film.

[0077] After performing step S804, step S805 can be optionally performed.

[0078] Step S805: Thin or thicken the preset region of the outermost release film among at least two release films.

[0079] In this step, the preset region of the outermost release film is thinned or thickened, so that the release film has macroscopic non-uniformity. Further, when the formed object is peeled off from the thin film structure, the surface of the thin film structure presents a non-uniform release force distribution, thereby significantly improving the speed of photocuring 3D printing, and at the same time improving the printing stability and success rate.

[0080] The method provided by the embodiments of the present application prepares at least one release film to fabricate a film structure for photocuring 3D printing. When at least one release film includes one release film, a preset area of the release film is thinned or thickened, thereby obtaining a film structure with unequal release forces per unit area in different thickness regions. When at least one release film includes at least two release films, the release films are stacked in sequence, and then a preset connection area of one release film between two adjacent release films is connected to a preset connection area of the other release film, thereby obtaining a film structure with unequal release forces per unit area in the preset connection area and the non-preset connection area. During the photocuring 3D printing process, this film structure can be used to contact the photosensitive resin. When the formed object (cured photosensitive resin) is peeled off from the surface of the film structure, the overall release force received by the surface of the film structure in contact with the photosensitive resin will be dispersed, and different release forces will act on different regions of the film structure. Since the magnitude of the release force is proportional to the contact area, the release force received by each region of the film structure will be smaller than the above-mentioned overall release force. When the force on one region of the film structure reaches the release force corresponding to that region, the corresponding part of the formed object will be peeled off. In this way, during the peeling movement of the formed object, the formed object will be peeled off from different regions of the surface of the film structure in sequence. Thus, even if the cross-sectional area of the formed object increases, it is not necessary to increase the peeling tension and the release stroke to complete the peeling action, as long as the peeling tension is greater than the release force of each region in the film structure. That is to say, it is possible to complete the peeling action by applying a smaller peeling tension and performing a shorter release stroke, which is conducive to accelerating the peeling speed of the formed object and improving the photocuring 3D printing speed.

[0081] The above embodiments introduce the film structure for photocuring 3D printing provided by the embodiments of the present application. Correspondingly, the present application also provides a photocuring 3D printer, and the photocuring 3D printer provided by this embodiment includes the film structure described in any of the above embodiments.

[0082] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the disclosed embodiments.

Claims

1. A film structure for photocuring 3D printing, characterized in that, The release force per unit area of the thin film structure is not equal in different regions; The surface of the thin film structure for contacting the photosensitive resin is on the same horizontal plane; The thin film structure includes: at least one release film; the at least one release film includes: one release film; wherein, the thickness of the release film in the preset region is different from the thickness of the release film in the non-preset region; wherein, the preset region of the release film is divided into several sub-preset regions, and the thicknesses of the respective sub-preset regions of the release film are different; Alternatively, the at least one release film includes: at least two release films; wherein, the respective release films in the at least two release films are stacked in sequence; in two adjacent release films, a preset connection region on one side surface of one release film is connected to a preset connection region on one side surface of the other release film; wherein, it includes: at least two preset connection regions are provided on one side surface of the release film, 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 connection region on one side surface of one release film is correspondingly connected to a preset connection region on one side surface of the other release film.

2. A manufacturing method of a film structure for photocuring 3D printing, which is applied to manufacture the film structure according to claim 1, characterized in that, It includes: Prepare at least one release film; When the at least one release film includes one release film, thin or thicken the preset region of the release film; Wherein, it includes: Thin or thicken different regions in the preset region of the release film to different thicknesses; When the at least one release film includes at least two release films, stack the respective release films in sequence; connect the preset connection region of one release film in two adjacent release films to the preset connection region of the other release film; wherein, it includes: weld or bond the preset connection region of one release film in two adjacent release films to the preset connection region of the other release film. The surface of the release film for contacting the photosensitive resin is on the same horizontal plane.

3. According to the method described in claim 2, characterized in that, The step of thinning or thickening the preset region of the release film includes: Mechanically thin the preset region of the release film; or, Laser thin the preset region of the release film; or, Chemically thin the preset region of the release film; or, Perform pattern loading on the preset region of the release film.

4. According to the method described in claim 2, characterized in that, After connecting the preset connection region of one release film in two adjacent release films to the preset connection region of the other release film, it includes: Thin or thicken the preset region of the outermost release film in the at least two release films.

5. A photocuring 3D printer, characterized in that: It includes the thin film structure according to any one of claim 1.

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