Pulse peel module, pulse peel tray, 3D printing apparatus and printing method

Abstract

This disclosure relates to a pulsed release module, a pulsed release tray, a 3D printing apparatus and a printing method, wherein the pulsed release module includes a tray assembly, a support assembly and a pulsed gas supply assembly, the tray assembly having a release film, the support assembly being located below the tray assembly and the support assembly having a support member, the support member and the release film being separated by a first predetermined distance in the height direction to form a gas chamber between the support member and the release film, the support member being provided with an intake port and an exhaust port communicating with the gas chamber, the pulsed gas supply assembly including a gas oscillation assembly and a gas supply line, the gas oscillation assembly being located in the gas supply line and the gas supply line being connected to the intake port.

Description

Cross-reference to Related Applications

[0001] This disclosure claims priority to a Chinese patent application filed with the China National Intellectual Property Administration on November 30, 2023, with application number 202311643769.0 and title of invention "Pulse Peeling Module, Pulse Peeling Tray, 3D Printing Device and Printing Method", the entire content of which is incorporated herein by reference.

Technical Field

[0002] This disclosure relates to the technical field of 3D printing, and particularly to a pulse peeling module, a pulse peeling tray, a 3D printing device and a printing method.

Background Art

[0003] In photo-curing 3D printing technology (e.g., DLP technology, LCD technology), a light source is used to irradiate a liquid photosensitive resin to cure it and form it on a forming platform, so as to cure and form the photosensitive material layer by layer to form a three-dimensional object. When photo-curing 3D printing uses a bottom-up forming method, the model of each layer is cured between the rigid surface of the tray and the forming platform. After curing, the printed model adheres to the rigid surface of the tray. Therefore, in order to perform the printing of the next layer, it is necessary to peel them off. During peeling, a large peeling force and noise are generated. When printing with a specific material (e.g., elastic material) or a specific model (e.g., a model with an overhanging arm), if the peeling force is large, there may be risks such as dropping and warping, which may lead to printing failure and, in turn, damage to the printing device.

[0004] In order to reduce the peeling force when removing the printed model, conventional technology uses a flexible release film instead of a rigid surface on the tray. Because the release film has a certain degree of ductility, the peeling between the cured printed model and the tray can be changed from surface separation to line separation, thereby reducing the peeling force to some extent. When a molding platform separates the printed model from the flexible release film, separation can only be achieved when the angle between the flexible release film and the bottom surface of the printed model reaches the critical value θ of the peeling angle. As shown in Figure 4, because the flexible release film has a certain degree of ductility, some elastic deformation occurs under the tensile force from the printed model, which can lengthen the peeling stroke and reduce peeling efficiency. In addition, a rigid support member is usually provided below the flexible release film to maintain the rigidity required for the tray. When the molding platform lowers the printed model, the bottom surface of the flexible release film and the top surface of the rigid support member adhere to each other. Therefore, when peeling, it is necessary to first separate the flexible release film from the rigid support member, and then separate the flexible release film from the printed model. The strong vacuum suction force exerted by the rigid support member on the flexible release film also increases the peeling force, and as a result, the conversion effect from surface separation to line separation is not fully realized. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] This disclosure provides a pulse peeling module, a pulse peeling tray, a 3D printing apparatus, and a printing method to solve the technical problems of high peeling force and long peeling stroke during the peeling of 3D printed models in the prior art. [Means for solving the problem]

[0006] In the first aspect, this disclosure is: A tray assembly comprising a tray assembly having a release film, A support assembly, wherein the support assembly is provided below the tray assembly, and the support assembly has a support member, and in order to form a gas chamber between the support member and the release film, the support member and the release film are separated by a first predetermined distance in the height direction, and the support member is provided with an intake port and an exhaust port communicating with the gas chamber, respectively. A pulsed gas supply assembly is provided, the pulsed gas supply assembly comprising a gas oscillation assembly and a supply line, wherein the gas oscillation assembly is provided in the supply line, and the supply line is connected to the intake port of the pulsed gas supply assembly.

[0007] Preferably, a sealing member is provided along the circumferential direction of the support member, and the sealing member is connected to the tray assembly.

[0008] Preferably, the sealing member is provided with a flow port that communicates with the gas chamber.

[0009] Preferably, an auxiliary member is provided on the side of the support member facing the release film, so that when the release film adheres closely to the support member and tends to move away from the support member, there is a peeling angle between the release film and the support member.

[0010] Preferably, the number of auxiliary members is at least two, and they are provided distributed along the circumferential direction of the support member so as to form a gas chamber with a height equal to that between the support member and the release film.

[0011] Preferably, there are four auxiliary members, each corresponding to one of the four corners of the support member, and / or, there are four auxiliary members, each corresponding to one of the four edges of the support member.

[0012] Preferably, the auxiliary member is one or a combination of any one of the following: tape, plastic plate, metal gasket, urethane foam, wooden board, or fiber cloth.

[0013] Preferably, the pulse gas supply assembly further includes a control valve that controls the flow of gas into the gas chamber according to a predetermined requirement.

[0014] Preferably, the support member is a transparent rigid support member or a transparent flexible support member.

[0015] Preferably, if the support assembly is a transparent flexible support member, it further includes a rigid substrate provided below the transparent flexible support member.

[0016] Preferably, the support member is one or a combination of several types from among fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, heat-sensitive resin, glass, and screen.

[0017] In a second aspect, the present disclosure relates to a pulsed release tray, the pulsed release tray comprising a release film and a support member, wherein the support member and the release film are separated by a second predetermined distance in the height direction in order to form a gas chamber between the support member and the release film, and the support member is provided with an intake port and an exhaust port, respectively, that communicate with the gas chamber. The intake and exhaust ports provide a pulsed peeling tray that is connected to a pulsed gas supply assembly.

[0018] Preferably, the support member is a transparent, flexible support member.

[0019] Preferably, the transparent flexible support member is one or a combination of several of the following: fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and heat-sensitive resin.

[0020] Preferably, the support assembly further includes a rigid substrate provided below the transparent flexible support member.

[0021] Preferably, an auxiliary member is provided on the side of the support member facing the release film, so that when the release film has a tendency to move away from the support member while being in close contact with the support member, there is a peeling angle between the release film and the support member.

[0022] Preferably, the number of auxiliary members is at least two, and they are dispersedly provided along the circumferential direction of the support member so as to form a gas chamber with a consistent height between the support member and the release film.

[0023] Preferably, the number of auxiliary members is four, and they are provided corresponding to the four corners of the support member respectively, and / or the number of auxiliary members is four, and they are provided corresponding to the four edges of the support member respectively.

[0024] Preferably, the auxiliary member is one or more combinations of a tape, a plastic plate, a metal gasket, a urethane foam, a thin wooden board, and a fiber cloth.

[0025] Preferably, a position sensor for detecting the position data of the release film is provided on the tray body.

[0026] On a third side, the present disclosure provides a 3D printing apparatus including a pulse peeling module provided by the first side of the present disclosure or a pulse peeling tray provided by the second side of the present disclosure, further including a forming platform, a radiation device, and a control system. The forming platform is provided above the tray assembly, the radiation device is provided below the support assembly, and the control system is associated with the forming platform, the radiation device, and the pulse gas supply assembly respectively.

[0027] Preferably, the control system communicates with the pulsed gas supply assembly to generate control commands based on a predetermined control policy and transmit them to the pulsed gas supply assembly.

[0028] Preferably, the control policy is set to generate and transmit a first control command when one or more of the following are detected: the release film of the 3D printing device is higher than a predetermined calibration position, the gas pressure in the 3D printing device is higher than a predetermined pressure range, the gas flow in the 3D printing device is higher than a predetermined range, the gas concentration in the 3D printing device is higher than a predetermined concentration range, and the force received by the lower surface of the release film of the 3D printing device is greater than the force received by the upper surface. The first control command includes controlling the pulsed gas supply assembly to reduce the gas supplied, or When one or more of the following are detected: the release film of the 3D printing device is lower than a predetermined calibration position, the gas pressure in the 3D printing device is lower than a predetermined pressure range, the gas flow in the 3D printing device is lower than a predetermined range, the gas concentration in the 3D printing device is lower than a predetermined concentration range, and the force received by the upper surface of the release film of the 3D printing device is smaller than the force received by the lower surface, it is set to generate and transmit a second control command. The second control command includes controlling the pulsed gas supply assembly to increase the gas supplied.

[0029] Preferably, the forming platform has a relief design for the auxiliary member to escape.

[0030] Preferably, the relief design is at least one of relief chamfering and relief grooves.

[0031] In a fourth aspect, the present disclosure is a 3D printing method using the 3D printing device provided by the third aspect of the present disclosure, comprising: acquiring a set of slice images corresponding to a three-dimensional model of a printing object and calculating the printing difficulty corresponding to each layer of slice images; The steps include determining the printing parameters and pulsed airflow parameters corresponding to the sliced ​​image of each layer based on the printing difficulty, The present invention provides a 3D printing method that includes the steps of determining a model printing operation corresponding to a slice image of each layer based on printing parameters, and determining a model peeling operation corresponding to a slice image of each layer based on pulsed airflow parameters.

[0032] Preferably, the pulse airflow parameters include the pulse frequency, and there is a proportional relationship between the pulse frequency and the printing difficulty.

[0033] Preferably, the model peeling operation includes introducing a pulsed airflow into the intake port at a pulse frequency during model peeling, thereby periodically changing the volume of the gas chamber and generating periodic oscillations in the release film.

[0034] This disclosure further provides a three-dimensional printing system comprising: a tray assembly having a release film; a support assembly, the support assembly having a support member, a gas chamber formed between the support member and the release film, the gas chamber communicating with an intake port and an exhaust port; and a gas supply assembly configured to supply gas to the gas chamber and periodically change the volume of the gas chamber.

[0035] In some embodiments, the gas supply assembly is configured to intermittently supply gas to the gas chamber.

[0036] In some embodiments, the gas supply assembly supplies gas to the gas chamber at different flow rates, and the gas in the gas chamber is discharged through the exhaust port at the same flow rate. [Effects of the Invention]

[0037] The technical means according to the embodiments of this disclosure have the following advantages compared to the prior art.

[0038] In the pulsed release module according to the embodiment of this disclosure, when peeling a printed material from the release film, the pulsed gas supply assembly introduces a pulsed airflow into the gas chamber through the intake port, thereby periodically changing the gas volume in the gas chamber and causing periodic oscillations in the release film. This enables the release film to oscillate in a wave-like manner during peeling, allowing the vacuum adsorption state between the release film and the support member to be quickly released, and the peeling angle between the bottom surface of the printed material and the release film to reach a critical value within a short peeling stroke. This is advantageous in shortening the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping.

[0039] In the pulsed release tray according to the embodiment of the present disclosure, the support member and the release film are separated by a second predetermined distance in the height direction to form a gas chamber. The support member is provided with an intake port and an exhaust port, respectively, that communicate with the gas chamber. The pulsed gas supply assembly introduces a pulsed airflow into the gas chamber through the intake port, thereby periodically changing the gas volume in the gas chamber and causing periodic oscillation in the release film. This enables the release film to oscillate in a wave-like manner during peeling of the printed material, allowing the vacuum adsorption state between the release film and the support member to be quickly released. Furthermore, the peeling angle between the bottom surface of the printed material and the release film can reach a critical value within a short peeling stroke, which is advantageous in shortening the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping the printed material. [Brief explanation of the drawing]

[0040] The accompanying drawings, incorporated herein and forming part of herein, illustrate embodiments conforming to this disclosure and, together with the specification, serve to illustrate the principles of this disclosure. To more clearly describe the embodiments of this disclosure or the technical means in the prior art, the following briefly introduces the drawings necessary for describing the embodiments or the prior art, and it is clear that those skilled in the art can obtain other drawings based on these drawings without any creative work. One or more embodiments are illustrated by corresponding pictures in the drawings, but these illustrative descriptions are not limiting to embodiments. In the drawings, elements having the same reference numeral are shown as similar elements, and unless otherwise stated, the figures in the drawings do not constitute a limitation on proportions. [Figure 1] This is a schematic diagram of the structure of a pulsed peeling module according to an embodiment of the present disclosure. [Figure 2] This is a schematic diagram of the connection between the tray assembly and the support assembly according to an embodiment of the present disclosure. [Figure 3] This is a schematic diagram of the connection between the printed material and the pulse peeling module according to an embodiment of the present disclosure. [Figure 4] This is a schematic diagram of the release film peeling process in conventional technology. [Figure 5] This is a schematic diagram of the peeling process of a pulse peeling module according to an embodiment of the present disclosure. [Figure 6] This is a plan view of a pulse peeling tray according to an embodiment of the present disclosure. [Figure 7] This is a cross-sectional view of Figure 6 AA according to an embodiment of the present disclosure. [Figure 8] This is a cross-sectional view of a pulse peeling tray according to an embodiment of the present disclosure. [Figure 9] This is a schematic diagram of a partial structure of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 10] This is a plan view of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 11] This is a partial structural diagram of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 12] This is a partial structural diagram of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 13] This is a schematic diagram of a partial structure of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 14]This is a plan view of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 15] This is a partial structural diagram of a support assembly, pulse peel tray, and molding platform according to an embodiment of the present disclosure. [Figure 16] This is a schematic diagram of the structure of a 3D printing apparatus according to an embodiment of the present disclosure. [Figure 17] This is a schematic control diagram of a 3D printing apparatus according to an embodiment of the present disclosure. [Figure 18] This is a flowchart of the 3D printing method according to the embodiment of the present disclosure. In Figures 2, 3, and 16, the dashed lines indicate the initial position of the release film, and in Figure 16, the dashed-dotted line indicates the irradiation range of the radiation device. [Modes for carrying out the invention]

[0041] To further clarify the purpose, technical solutions, and advantages of the embodiments of this disclosure, the technical solutions in the embodiments of this disclosure will be described clearly and completely below with reference to the drawings of the embodiments of this disclosure, of course, the embodiments described are only a selection of the embodiments of this disclosure, not all of them. All other embodiments obtained based on the embodiments of this disclosure, without creative work by a person skilled in the art, are all within the scope of protection of this disclosure.

[0042] The following disclosures are used to realize different configurations of this disclosure by providing many different embodiments or examples. For the sake of brevity of the disclosure, the components and setups of specific examples are described below. Naturally, these are illustrative only and are not intended to limit this disclosure. Furthermore, this disclosure may repeatedly refer to numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate relationships between the various embodiments and / or setups discussed.

[0043] Spatially relative terms such as “inside,” “outside,” “inside,” “outside,” “bottom,” “downward,” “top,” “upward,” “front,” and “back” are used here to facilitate descriptions of the relationship between one element or feature and other elements or features, as illustrated. Such spatially relative terms may be intended to include different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawing undergoes a reversal of position, a change in orientation, or a change in motion, these orientation indications will change accordingly. For example, an element described as “below another element or feature” or “below another element or feature” will subsequently be “above another element or feature” or “above another element or feature.” Thus, the exemplified term “below…” may include both upward and downward directions. The device may be oriented in other directions (it may be rotated 90 degrees or in other directions), and the spatially relative descriptors used herein will be interpreted accordingly.

[0044] As shown in Figure 16, the present disclosure provides a 3D printing apparatus. In one embodiment, the 3D printing apparatus may include a molding platform 4, a tray assembly 1, and a support assembly 2, etc.

[0045] The tray assembly 1 contains the printing material, and the molding platform 4 may be provided on the side of the tray assembly 1 that contains the printing material. In this embodiment, the molding platform 4 may have a molding surface 82, and during printing, the printed material hardens layer by layer on the molding surface 82, and the printing material is molded into the desired printed material.

[0046] The 3D printing technologies applicable to this disclosure may include, but are not limited to, photocuring 3D printing technologies such as DLP, LCD, Micro-LED, and Mini-LED, as well as other pattern exposure 3D printing technologies.

[0047] In 3D printing equipment, when using a tension film tray, as the molding platform descends during printing, the bottom of the print is more likely to come into contact with the liquid photosensitive material. At this time, a liquid discharge force is generated on the upper surface of the flexible release film, and the rigid support member below the flexible release film generates an electrostatic force on the lower surface of the flexible release film. Due to the dual action of the liquid discharge force and electrostatic force, the flexible release film elastically deforms and is pulled downward until it adheres tightly to the rigid support member, creating a vacuum between a portion of the release film and the rigid support member, and after the bottom layer print model has hardened... Surface delamination is required between the flexible release film and the rigid support member. During surface delamination, the delamination force increases, and the delamination force value may change abruptly as the adhesion is released during delamination. This can lead to printing failures or abnormalities in the delamination surface of the layer. After surface delamination between the flexible release film and the rigid support member is completed, the molding platform further raises the printed material, and linear delamination becomes possible only when the delamination angle between the bottom surface of the printed material and the flexible release film reaches a critical value θ. Because the flexible release film has a certain ductility, the delamination stroke d becomes longer, as shown in Figure 4.

[0048] To address the challenges of high peeling force and long peeling strokes during the delamination of 3D printed models, this disclosure provides a pulsed delamination module, a 3D printing apparatus, and a printing method. By forming a gas chamber 100 with a release film 11 and a support member 21, and introducing a pulsed airflow into the gas chamber by a gas oscillation assembly 31 of a pulsed gas supply assembly, the gas volume in the gas chamber 100 is changed, generating periodic oscillations in the release film 11. This allows for the rapid release of the vacuum adsorption state between the release film 11 and the support member 21, avoiding the influence of surface delamination between the release film 11 and the support member 21 on the magnitude of the peeling force, significantly reducing the peeling force, allowing the release film 11 to reach the critical value of the peeling angle more quickly during oscillation, shortening the peeling stroke, thereby improving printing efficiency and success rate, and reducing the risk of dropping.

[0049] As shown in Figures 1 to 18, an embodiment of the present disclosure provides a pulsed release module comprising a tray assembly 1, a support assembly 2, and a pulsed gas supply assembly 3, wherein the tray assembly 1 has a release film 11 and, in combination with a tray body 12, forms a tank for containing a liquid photosensitive material (e.g., a photosensitive resin); the support assembly 2 is connected below the tray assembly 1 and has a support member 21 that supports the release film 11 during pressing on the molding platform 4, and the support member 21 and the release film 11 have a first predetermined distance in the height direction, where the first predetermined distance is the thickness of the gas chamber, in order to form a gas chamber 100 between the support member 21 and the release film 11, and in the initial state the lower surface of the release film 11 and the upper surface of the support member 21 are provided to prevent them from being in close contact; as shown in Figure 1, the support member 21 is provided with an intake port 211 and an exhaust port 212, respectively, which communicate with the gas chamber 100 The pulse gas supply assembly 3 facilitates the inflow and outflow of airflow into the gas chamber 100. The pulse gas supply assembly 3 includes a gas oscillation assembly 31 and an air supply pipe 32. The gas oscillation assembly 31 is provided in the air supply pipe 32 and changes the airflow in the air supply pipe 32 into a pulsed airflow. When peeling the printed material 7 from the release film 11, the pulse gas supply assembly 3 introduces the pulsed airflow into the gas chamber 100 via the intake port 211, thereby periodically changing the gas volume in the gas chamber 100 and causing periodic oscillation in the release film 11. This allows the release film 11 to oscillate in a wave-like pattern during peeling, quickly releasing the vacuum adsorption state between the release film 11 and the support member 21. Furthermore, the peeling angle between the bottom surface of the printed material 7 and the release film 11 can reach a critical value θ within a short peeling stroke d. As shown in Figure 5, this shortens the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping the printed material.

[0050] The release film 11 may also be connected to the tray body 12 using a tension membrane mechanism in the prior art. This ensures that the release film 11 is initially horizontal, making it easier to control the thickness of each layer of the printed material 7 and avoiding thickness inconsistencies. Because the release film 11 has an elastic structure, the volume of the internal space of the gas chamber changes slightly due to changes in air pressure at the intake port 211. As shown in Figure 2, the magnitude of this change is represented by the magnitude of the change in air pressure at the exhaust port 212.

[0051] The first predetermined distance may be set as needed, and in some embodiments of this disclosure, the first predetermined distance is 0.01 mm to 10 mm, for example, 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, or any value between two points. This is because, during exposure curing, if the support member 21 does not tightly support the bottom of the release film 11, a stable molding surface cannot be provided for molding. If the thickness of the gas chamber 100 is too large, when printing a model with a small cross-sectional area, the bottom of the printed material 7 cannot provide sufficient liquid discharge force to the release film 11, making it difficult to tightly adhere to the support member 21. As a result, the molding surface becomes unstable, and if the cross-section changes between different layers of the printed material 7, the printing thickness between layers may become uneven. In this disclosure, when the release film 11 oscillates due to the pulsed airflow, the vacuum adsorption effect formed by the close contact between the release film 11 and the lower support member 21 is quickly released during peeling after exposure curing. As a result, the entire gas chamber 100 can quickly return to its initial gas chamber state, and the peeling force after vacuum release remains the same as in the gas chamber state when there is no contact. Therefore, it is not necessary to increase the thickness of the gas chamber 100 to achieve this effect. When the first predetermined distance is 0.01 mm to 10 mm, the thickness of the gas chamber is thin, making it easier for the support member 21 to tightly support the bottom of the release film 11 during molding, providing a stable molding surface for molding. This improves the curing accuracy of each layer and the molding consistency of the cured area, as well as reducing the risk of abnormal zero point setting for the first layer in photocuring printing.

[0052] The gas oscillation assembly 31 can use a conventional gas oscillator, and the pulse gas supply assembly 3 further includes a gas source 33 connected to the gas oscillation assembly 31 to supply an initial airflow. The gas source 33 can be nitrogen gas, oxygen gas, air, or an inert gas. The air supply pipeline 32 may be provided with a pressure detection member and a valve member to facilitate detection of the pulse airflow in the air supply pipeline 32.

[0053] In some embodiments, the pulsed gas supply assembly 3 includes a control valve 34 that controls the flow of gas into the gas chamber 100 according to predetermined requirements. Specifically, depending on the requirements of the printed material 7, the gas may be supplied continuously, intermittently, continuously within a certain period, or intermittently within a certain period, but is not limited thereto, and can be set according to experimental requirements, process policies, etc., as those skilled in the art would like.

[0054] In some embodiments of this disclosure, a sealing member 22 is provided along the circumferential direction of the support member 21 to allow airflow to enter and exit the gas chamber only through the intake port 211 and the exhaust port 212, and the sealing member 22 is connected to the tray assembly 1 to seal the space between the support member and the tray assembly. Specifically, the sealing member 22 may be connected between the tray body 12 and the support member 21, as shown by the first sealing member 22a in Figure 2, or it may be directly connected between the release film 11 and the support member 21, as shown by the second sealing member 22b in Figure 7. The sealing member 22 is also an auxiliary member 84 provided between the release film 11 and the support member 21, as shown by the auxiliary member 84 in Figure 8.

[0055] If the sealing member 22 is directly connected between the release film 11 and the support member 21, and the intake port 211 and exhaust port 212 are located on the outer circumference of the sealing member 22, the pulsed airflow cannot flow into the gas chamber 100 formed by the release film 11, the sealing member 22, and the support member 21. Therefore, in some embodiments of this disclosure, as shown in Figure 6, the sealing member 22 is provided with a flow port 221 that communicates with the gas chamber.

[0056] The exhaust port 212 may be provided on the support member 21, or it may be provided in the unsealed area of ​​the sealing member 22.

[0057] Since it is necessary to provide a stable molding surface to the release film 11 when the support member 21 is in close contact with the release film 11, in some embodiments of this disclosure the support member 21 is a transparent rigid support member 21a, and as shown in Figures 1 to 3, when the molding platform 4 and the printed material 7 are pressed against the release film 11, the upper surface of the transparent rigid support member 21a is in close contact with the bottom of the release film 11, so that the support member can provide a supporting function and a stable molding surface for exposure curing.

[0058] In some embodiments, as shown in Figures 7-15, the support assembly 2 may include a support member 21 and an auxiliary member 84 to ensure that the support surface of the support member 21 facing the release film 11 is lower than the release film 11, and to better ensure controllability of the height (thickness) of the gas chamber 100. The support member 21 may be provided on one side of the tray assembly 1, specifically on the side of the tray assembly 1 away from the molding platform 4. The auxiliary member 84 may be provided on the side of the support member 21 facing the release film 11, so that there is a peel angle between the release film 11 and the support member 21 when the release film 11 tends to move in a direction away from the support member 21 while adhering closely to it. The auxiliary member 84 also prevents the release film 11 from collapsing and ensures that the gas chamber 100 maintains a predetermined height.

[0059] The tray assembly 1 in this embodiment may be a tray assembly 1 with a tension film structure. Specifically, the tray assembly 1 may further include a tray body 12 provided connected to the outer circumference of the release film 11, and the release film 11 is connected to the tray body 12 in a tightly stretched state, thereby closing one end of the tray body 12, and the tray assembly 1 can contain the printing material.

[0060] Furthermore, the support member 21 plays a role in supporting the release film 11 of the tray assembly 1 during 3D printing, and also provides a flat support surface for the printing material located between the release film 11 and the molding surface 82 of the molding platform 4 during 3D printing, thereby improving the flatness of the cured layer. Specifically, the support member 21 may be made of a light-transmitting material or a material that is at least partially light-transmitting in order to allow light to pass through the support member 21, through the release film 11, and then cure the printing material in the tray assembly 1.

[0061] The auxiliary members 84 further play a role in supporting the release film 11, thereby creating a certain gap between the release film 11 and the support member 21, i.e., a gas chamber 100. Specifically, the number of auxiliary members 84 may be one or more, and if there are multiple auxiliary members 84, they may be spaced apart from each other and provided on one side of the support member 21. Furthermore, the auxiliary members 84 may be provided on the peripheral portion of the support member 21, and of course, in some embodiments, they may be provided on the intermediate portion of the support member 21, or part of them may be provided on the peripheral portion and part of them on the intermediate portion, and specifically, they may be provided according to the actual needs, and are not specifically limited here.

[0062] Furthermore, during 3D printing, the molding process of each cured layer may include resin discharge by pressing the molding platform 4, curing of the printing material by exposure to a light source, and separation of the cured layer from the release film 11 as the molding platform 4 rises. After the molding platform 4 descends, the release film 11 tends to adhere closely to the support surface of the support member 21 on the side facing the release film 11, resulting in vacuum suction and making separation difficult. Thus, in the process of separating the printed material from the release film 11 as the molding platform 4 rises, the release film 11 exerts excessive tensile force on the printed material, which may result in printing failure or problems such as poor surface quality of the printed material.

[0063] In this embodiment, by further providing an auxiliary member 84 to the support member 21, a gas chamber 100 is formed between the release film 11 and the support member 21. Even when the molding platform 4 descends and vacuum suction is formed between the release film 11 and the support member 21, creating a tight seal, the auxiliary member 84 maintains the gas chamber 100 between the support member 21 and the release film 11. As the molding platform 4 rises and peels the printed material 7 from the release film 11, the release film 11 moves away from the support member 21. At this time, the presence of the gas chamber between the release film 11 and the support member 21 creates a peeling angle α as shown in Figure 12. Furthermore, the presence of the peel angle α reduces the difficulty of releasing the vacuum environment between the release film 11 and the support member 21 when the release film 11 is stretched, that is, it makes it easier to separate the release film 11 and the support member 21. In addition, it significantly reduces the peeling force between the release film 11 and the printed material 7 during the upward peeling of the molding platform 4, making it easier to peel the printed material 7 from the release film 11, improving the printing success rate and printing efficiency, reducing the risk of the printed material 7 falling from the molding platform 4 during the upward peeling of the molding platform 4, and improving the quality of the printed material 7.

[0064] In one embodiment, the number of auxiliary members 84 is at least two, and they are distributed along the circumferential direction of the release film 11. Specifically, the number of auxiliary members 84 may be two, three, five, ten, etc., and they may be uniformly distributed around the gas chamber 100 or randomly distributed.

[0065] In one embodiment, the auxiliary member 84 is configured to form a gas chamber 100 whose height matches that of the support member 21 and the release film 11. This refers to the case when the molding platform 4 is not pressing down on the release film 11.

[0066] Furthermore, the height of the gas chamber 100 may be 0.2 to 0.3 mm, specifically 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. This height control can effectively reduce the peeling force between the printed material and the release film 11.

[0067] In one application scenario, supplying gas to the gas chamber 100 helps to release the vacuum suction between the release film 11 and the support member 21 during the rising of the molding platform 4, making it easier to separate the release film 11 and the support member 21.

[0068] It should be noted that "height matching" as used herein is not limited to strict matching, but may mean matching within a predetermined margin of error. Of course, in other embodiments, a gas chamber may be formed between the support member 21 and the release film 11 in which the heights do not match, as long as the requirement for easy peeling is met, and the invention is not limited thereto.

[0069] In one embodiment, as shown in Figures 8 to 11, the number of auxiliary members 84 may be four, each corresponding to one of the four corners of the support member 21.

[0070] In one embodiment, as shown in Figures 13 to 15, the number of auxiliary members 84 may be four, each corresponding to one of the four edges of the support member 21. The auxiliary members 84 may be located at the center of their respective edges or at other positions.

[0071] In one embodiment, the auxiliary member 84 may be installed according to the shape of the support member 21, for example, it may be circular, polygonal, or irregular in shape. In one application scenario, the shape may be circular, in which case the auxiliary member 84 may be provided along the circumferential direction of the support member 21. In another application scenario, the shape may be polygonal, in which case the auxiliary member 84 may be installed corresponding to the corners of the polygon or corresponding to the edges of the polygon, and is not specifically limited here.

[0072] In one embodiment, the auxiliary member 84 may be one or more of the following: tape, plastic plate, metal gasket, urethane foam, wooden board, fiber cloth, etc., or it may be any other suitable material.

[0073] In one embodiment, the auxiliary member 84 is selected to be adhered to the support member 21 by selecting a tape. The thickness of the tape is 0.1 to 0.3 mm, specifically 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape may be adhered to the release film 11.

[0074] Furthermore, the tape may consist of a base material and a backing adhesive, may be a single-sided tape, a double-sided tape, or may not have a backing adhesive. The base material of the tape may be cast polypropylene film (CPP), oriented polypropylene film (OPP), biaxially oriented polypropylene film (BOPP), polyethylene (PE), uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon-coated glass fiber cloth, acetate cloth, fabric base material, foam, metal foil, masking tape, etc. The backing adhesive may be water-based adhesive, oil-based adhesive, hot melt adhesive, natural rubber, synthetic rubber, etc., and is not particularly limited thereto.

[0075] In some embodiments, the pulse gas supply assembly 3 further includes a control valve that controls the intermittent flow of gas into the gas chamber 100. By providing the control valve, the gas flow into the gas chamber can be easily controlled, and gas, for example, an oscillating gas, can be supplied intermittently as needed. Of course, the gas may be supplied continuously, or, as needed, the gas may be supplied continuously for a certain period and intermittently for a certain period, and is not limited thereto, and those skilled in the art can set it appropriately based on process policies, etc.

[0076] In some embodiments, the support member is a transparent rigid support member 21a or a transparent flexible support member 21b. When the support member 21 is a transparent flexible support member 21b, a gas chamber 100 is formed between the release film 11 and the transparent flexible support member 21b. As shown in Figure 8, the auxiliary member is provided on the flexible support member 21b and contacts the release film 11 to better maintain the height (thickness) of the gas chamber 100 at a predetermined value. The auxiliary member 84 may also be provided on the side of the support member 21 facing the release film 11, thereby creating a peel angle between the release film 11 and the support member 21 when the release film 11 tends to move away from the support member 21 due to its close contact with the support member 21.

[0077] In some embodiments, as shown in Figure 7, the support assembly 2 further includes a rigid substrate 23 located below the transparent flexible support member 21b, providing support to ensure consistency during printing of the release film 11 and providing a stable molded surface. The rigid substrate may be a glass support plate, a plastic support plate, or a display screen, such as an LCD screen, Micro-LED screen, Mini-LED screen, or OLED screen, and is not specifically limited herein.

[0078] In some embodiments, the support member 21 and the rigid substrate 23 have a third predetermined distance in the height direction, and in the initial state, the release film 11, the transparent flexible support member 21b, and the transparent rigid substrate 23 are all separated. When the molding platform 4 and the printed material 7 are pressed against the release film 11, the bottom surface of the release film 11 adheres closely to the top surface of the transparent flexible support member 21b, and the bottom surface of the transparent flexible support member 21b adheres closely to the top surface of the rigid substrate 23. As a result, the transparent rigid substrate 23 can provide a stable molding surface for exposure curing. During peeling, a pulsed airflow flows between the release film 11 and the transparent flexible support member 21b, causing both the release film 11 and the transparent flexible support member 21b to generate high-frequency oscillations. Since the oscillation directions of both are opposite, this promotes the change in gas volume in the gas chamber 100, reduces the magnitude of the suction pressure, and mitigates the impact on the molding quality of the peeled surface of the solid polymer (i.e., the printed material 7) due to excessive amplitude of oscillations from the release film 11. The vacuum adsorption effect caused by the adhesion between the release film 11 and the transparent flexible support member 21b below can be quickly released, and the transparent flexible support member 21b and the transparent rigid substrate 23 are also separated by the oscillations, thus not affecting the peeling of the printed material 7.

[0079] Furthermore, the third predetermined distance is smaller than the first predetermined distance. This prevents the gap between the release film 11 and the rigid substrate 23 from becoming too large, which would affect the molding accuracy. As shown in Figure 7, a connecting member 24 having thickness along the circumferential direction of the transparent rigid substrate 23 is provided to ensure the third predetermined distance between the transparent flexible support member 21b and the rigid substrate 23.

[0080] Since the release film 11 and the transparent flexible support member 21b need to withstand repeated pressing and peeling, in some embodiments of this disclosure, the release film 11 and the transparent flexible support member 21b are fluorine-containing polymer films. Because fluorine-containing polymer films have excellent mechanical strength, they can withstand repeated pressing and peeling by the molding platform 4. In addition, fluorine-containing polymer films have advantages such as excellent chemical stability and excellent thermal stability, making them suitable for 3D printing. In some embodiments, the fluorine-containing polymer films include types such as FEP (tetrafluoroethylene-hexafluoropropylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (film manufactured by combining FEP resin and PTFE resin copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) film, PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride film) film, and ETFE (ethylene-tetrafluoroethylene copolymer) film.

[0081] In some embodiments, the transparent flexible support member 21b may be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film. Both have the advantage of high transparency and do not affect the exposure and curing of the printed material 7. The PDMS film has high elasticity and resilience, as well as excellent weather and heat resistance (-60 to 200°C). The PMP film has extremely low surface tension, only 24 mN / m, which is lower than some fluororesins. Compared to other materials, it has excellent peelability, making it easy to separate the release film 11 from the transparent flexible support member 21b.

[0082] In one embodiment, the support member 21 may be a rigid support plate, for example. Specifically, it may be a glass support plate, a plastic support plate, etc., or a display screen, for example, an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, etc., and is not specifically limited herein.

[0083] In some embodiments, the support member 21 is one or a combination of several of the following: fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, heat-sensitive resin, glass, and screen.

[0084] In the above embodiment, the Pulsing Release Module (PRM) according to the present disclosure introduces a pulsed airflow (PA) into the gas chamber at the bottom of the tray to form pulsed release when peeling off the printed material 7. When the bottom layer of the printed material 7 is peeled from the release film 11, high-frequency oscillation occurs in the release film 11 under the action of the pulsed airflow, which quickly releases the vacuum adsorption state between the release film 11 and the support member 21, removing the vacuum adsorption force and reducing the peeling force during demolding. It also avoids abrupt changes in peeling force when the release film 11 and the support member 21 are separated. After the release film 11 and the support member 21 are separated, the release film 11 generates a sustained physical oscillation motion under the action of the pulsed airflow, achieving linear peeling from the edge to the center during demolding, realizing a side peeling effect, significantly reducing the peeling force value, improving the success rate of demolding the printed material 7 of that layer, improving printing efficiency and success rate, and reducing the risk of dropping.

[0085] As shown in Figures 1 to 18, a second aspect of an embodiment of the present disclosure provides a pulse peel tray having a release film 11 and a support member 21, wherein the support member 21 and the release film 11 are separated by a second predetermined distance in the height direction in order to form a gas chamber 100 between the support member 21 and the release film 11, and the support member 21 is provided with an intake port 211 and an exhaust port 212 communicating with the gas chamber 100, and the intake port 211 and the exhaust port 212 are connected to a pulse gas supply assembly 3. The pulsed gas supply assembly 3 introduces a pulsed airflow into the gas chamber through the intake port 211, periodically changing the gas volume in the gas chamber 100 and generating periodic oscillations in the release film 11. This allows the release film 11 to oscillate in a wave-like pattern during peeling of the printed material 7, quickly releasing the vacuum adsorption between the release film 11 and the support member 21. Furthermore, the peeling angle between the bottom surface of the printed material 7 and the release film 11 reaches a critical value within a short peeling stroke, thus shortening the peeling force and peeling stroke, which is advantageous for improving printing efficiency and success rate, and reducing the risk of dropping.

[0086] In some embodiments, the pulse peel tray may be the tray assembly in the first side view of the embodiment of the present disclosure, and the second predetermined distance may be equal to the first predetermined distance.

[0087] In some embodiments, the support assembly 2 may include a support member 21 and an auxiliary member 84. The support member 21 may be provided on one side of the tray assembly 1, specifically on the side away from the molding platform 4. The auxiliary member 84 may be provided on the side of the support member 21 facing the release film 11, so that there is a peel angle between the release film 11 and the support member 21 when the release film 11 tends to move away from the support member 21 in close contact with it.

[0088] The tray assembly 1 in this embodiment may be a tray assembly 1 with a tension film structure. Specifically, the tray assembly 1 may further include a tray body 12 provided connected to the outer circumference of the release film 11, and the release film 11 is connected to the tray body 12 in a tightly stretched state, thereby closing one end of the tray body 12, and the tray assembly 1 can contain the printing material.

[0089] Furthermore, the support member 21 plays a role in supporting the release film 11 of the tray assembly 1 during 3D printing, and also provides a flat support surface for the printing material located between the release film 11 and the molding surface 82 of the molding platform 4 during 3D printing, thereby improving the flatness of the cured layer. Specifically, the support member 21 may be made of a light-transmitting material or a material that is at least partially light-transmitting in order to allow light to pass through the support member 21, through the release film 11, and then cure the printing material in the tray assembly 1.

[0090] The auxiliary members 84 further play a role in supporting the release film 11, thereby creating a certain gap between the release film 11 and the support member 21, i.e., a gas chamber 100. Specifically, the number of auxiliary members 84 may be one or more, and if there are multiple auxiliary members 84, they may be spaced apart from each other and provided on one side of the support member 21. Furthermore, the auxiliary members 84 may be provided on the peripheral portion of the support member 21, and of course, in some embodiments, they may be provided on the intermediate portion of the support member 21, or part of them may be provided on the peripheral portion and part of them on the intermediate portion, and specifically, they may be provided according to the actual needs, and are not specifically limited here.

[0091] Furthermore, during 3D printing, the molding process of each cured layer may include resin discharge by pressing the molding platform 4, curing of the printing material by exposure to a light source, and separation of the cured layer from the release film 11 as the molding platform 4 rises. After the molding platform 4 descends, the release film 11 tends to adhere closely to the support surface of the support member 21 on the side facing the release film 11, resulting in vacuum suction and making separation difficult. Thus, in the process of separating the printed material from the release film 11 as the molding platform 4 rises, the release film 11 exerts excessive tensile force on the printed material, which may result in printing failure or problems such as poor surface quality of the printed material.

[0092] In this embodiment, by further providing an auxiliary member 84 to the support member 21, a gas chamber 100 is formed between the release film 11 and the support member 21. Even when the molding platform 4 descends and vacuum suction is formed between the release film 11 and the support member 21, creating a tight seal, the auxiliary member 84 maintains the gas chamber 100 between the support member 21 and the release film 11. As the molding platform 4 rises and peels the printed material 7 from the release film 11, the release film 11 moves away from the support member 21. At this time, the presence of the gas chamber 100 between the release film 11 and the support member 21 creates a peel angle α as shown in Figure 12. Furthermore, the presence of the peel angle α reduces the difficulty of releasing the vacuum environment between the release film 11 and the support member 21 when the release film 11 is stretched, that is, it makes it easier to separate the release film 11 and the support member 21. In addition, it significantly reduces the peeling force between the release film 11 and the printed material 7 during the upward peeling of the molding platform 4, making it easier to peel the printed material 7 from the release film 11, improving the printing success rate and printing efficiency, reducing the risk of the printed material 7 falling from the molding platform 4 during the upward peeling of the molding platform 4, and improving the quality of the printed material 7.

[0093] In one embodiment, the number of auxiliary members 84 is at least two, and they are distributed along the circumferential direction of the release film 11. Specifically, the number of auxiliary members 84 may be two, three, five, ten, etc., and they may be uniformly distributed in the fixed gas chamber 100 or randomly distributed.

[0094] In one embodiment, the auxiliary member 84 is configured to form a gas chamber 100 whose height matches that of the support member 21 and the release film 11. This refers to the case when the molding platform 4 is not pressing down on the release film 11.

[0095] Furthermore, the height of the gas chamber 100 may be 0.2 to 0.3 mm, specifically 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, etc. This height control can effectively reduce the peeling force between the printed material and the release film 11.

[0096] In this way, the ventilation design can be further optimized to supply at least one of the following gases between the release film 11 and the support member 21, such as oxygen gas, nitrogen gas, or an inert gas, according to the actual needs.

[0097] In one application scenario, supplying gas to the gas chamber 100 helps to release the vacuum suction between the release film 11 and the support member 21 during the rising of the molding platform 4, making it easier to separate the release film 11 and the support member 21.

[0098] It should be noted that "height matching" as used herein is not limited to strict matching, but may mean matching within a predetermined margin of error. Of course, in other embodiments, a gas chamber may be formed between the support member 21 and the release film 11 in which the heights do not match, as long as the requirement for easy peeling is met, and the invention is not limited thereto.

[0099] In one embodiment, as shown in Figures 7 to 11, the number of auxiliary members 84 may be four, each corresponding to one of the four corners of the support member 21.

[0100] In one embodiment, as shown in Figures 13 to 15, the number of auxiliary members 84 may be four, each corresponding to one of the four edges of the support member 21. The auxiliary members 84 may be located at the center of their respective edges or at other positions.

[0101] In one embodiment, the auxiliary member 84 may be installed according to the shape of the support member 21, for example, it may be circular, polygonal, or irregular in shape. In one application scenario, the shape may be circular, in which case the auxiliary member 84 may be provided along the circumferential direction of the support member 21. In another application scenario, the shape may be polygonal, in which case the auxiliary member 84 may be installed corresponding to the corners of the polygon or corresponding to the edges of the polygon, and is not specifically limited here.

[0102] In one embodiment, the auxiliary member 84 may be one or more of the following: tape, plastic plate, metal gasket, urethane foam, wooden board, fiber cloth, etc., or it may be any other suitable material.

[0103] In one embodiment, the auxiliary member 84 is selected to be adhered to the support member 21 by selecting a tape. The thickness of the tape is 0.1 to 0.3 mm, specifically 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, in some application scenarios, the tape may be adhered to the release film 11.

[0104] Furthermore, the tape may consist of a base material and a backing adhesive, may be a single-sided tape, a double-sided tape, or may not have a backing adhesive. The base material of the tape may be cast polypropylene film (CPP), oriented polypropylene film (OPP), biaxially oriented polypropylene film (BOPP), polyethylene (PE), uniaxially oriented polypropylene film (MOPP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), Teflon, Teflon-coated glass fiber cloth, acetate cloth, fabric base material, foam, metal foil, masking tape, etc. The backing adhesive may be water-based adhesive, oil-based adhesive, hot melt adhesive, natural rubber, synthetic rubber, etc., and is not particularly limited thereto.

[0105] In some embodiments, the support assembly 2 further includes a rigid substrate 23 provided below the transparent flexible support member 21b, the rigid substrate may be a glass support plate, a plastic support plate, a display screen, such as an LCD screen, a Micro-LED screen, a Mini-LED screen, an OLED screen, or other rigid material, and is not particularly limited herein. It provides support, ensures consistency during printing of the release film (11), and provides a stable molded surface.

[0106] In some embodiments, the transparent flexible support member 21b is a fluorine-containing polymer film, a polydimethylsiloxane film, or a polymethylpentene film. In some embodiments, the fluorine-containing polymer film includes types such as FEP (tetrafluoroethylene-hexafluoropropylene copolymer) film, PTFE (polytetrafluoroethylene) film, nFEP film (a film manufactured by combining FEP resin and PTFE resin copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) film, PVDF (polyvinylidene fluoride) film, PVF (polyvinyl fluoride film) film, and ETFE (ethylene-tetrafluoroethylene copolymer) film.

[0107] In some embodiments, the transparent flexible support member 21b may be a polydimethylsiloxane (PDMS) film or a polymethylpentene (PMP) film. Both have the advantage of high transparency and do not affect the exposure and curing of the printed material 7. The PDMS film has high elasticity and resilience, as well as excellent weather and heat resistance (-60 to 200°C). The PMP film has an extremely low surface tension of only 24 mN / m, which is lower than some fluororesins, and has excellent peelability compared to other materials, making it easy to separate the release film 11 from the transparent flexible support member 21b.

[0108] In some embodiments, the transparent flexible support member 21b is one or a combination of one of the following: fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and heat-sensitive resin.

[0109] In the above embodiment, in the Pulsing Release Resin Tank (PRRT) according to the present disclosure, the pulse gas supply assembly 3 introduces a pulsed airflow into the gas chamber via the intake port 211, thereby periodically changing the gas volume in the gas chamber 100 and generating periodic oscillations in the release film 11. This allows the release film 11 to oscillate in a wave-like manner during peeling when the printed material 7 is peeled from the release film 11, enabling the vacuum adsorption state between the release film 11 and the support member 21 to be quickly released. Furthermore, the peeling angle between the bottom surface of the printed material 7 and the release film 11 can reach a critical value within a short peeling stroke d, which is advantageous in shortening the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping.

[0110] A third aspect of the embodiments of the present disclosure provides a 3D printing apparatus, as shown in Figures 1 to 18, comprising a pulse peel module in the above embodiments or a pulse peel tray provided in the second aspect of the present disclosure, and further comprising a molding platform 4, a radiation device 5, and a control system 6, wherein the molding platform 4 is located above the tray assembly 1 and moves the print 7 vertically to achieve molding and peeling of the print 7; the radiation device 5 is located below the support assembly 2 and exposes and hardens the bottom layer of the print 7 by transmitting light rays through the support member 21; and the control system 6 is associated with the molding platform 4, the radiation device 5, and the pulse gas supply assembly 3, respectively, and transmits control signals to each component. The association of the control system 6 with the molding platform 4, the radiation device 5, and the pulse gas supply assembly 3 in this embodiment includes, but is not limited to, connections, physical connections, and communication connections, as long as data exchange, communication, and transmission and reception of data information are possible between each component.

[0111] In some embodiments of this disclosure, the control system 6 communicates with the pulse gas supply assembly 3 to generate and transmit control commands to the pulse gas supply assembly 3 based on a predetermined control policy.

[0112] In embodiments of the present invention, the control system 6 generates control commands based on a predetermined control policy, which can further control the increase or decrease of gas supplied by the pulse gas supply assembly 3. For example, if one or more of the following are detected—that the release film of the 3D printer is higher than a predetermined calibration position, that the gas pressure inside the 3D printer is higher than a predetermined pressure range, that the gas airflow inside the 3D printer is higher than a predetermined range, that the gas concentration inside the 3D printer is higher than a predetermined concentration range, and that the force acting on the lower surface of the release film of the 3D printer is greater than the force acting on the upper surface—this indicates that the pulse gas supply assembly 3 has already supplied too much gas to the 3D printer and that the pressure and concentration inside the 3D printer need to be adjusted. In this case, the control policy is set to generate and transmit a first control command, which includes controlling the gas supplied by the pulse gas supply assembly 3 to decrease, or If one or more of the following are detected—the release film of the 3D printer being lower than a predetermined calibration position, the gas pressure inside the 3D printer being lower than a predetermined pressure range, the gas airflow inside the 3D printer being lower than a predetermined range, the gas concentration inside the 3D printer being lower than a predetermined concentration range, and the force acting on the upper surface of the release film of the 3D printer being less than the force acting on the lower surface—this indicates that the pulse gas supply assembly 3 has supplied too little gas to the 3D printer, which may affect the curing effect of the resin material and make it difficult to peel it off the tray, and therefore the pressure and concentration inside the 3D printer need to be adjusted. In this case, the control policy is set to generate and transmit a second control command, which includes controlling the pulse gas supply assembly 3 to increase the amount of gas it supplies.

[0113] The height of the release film 11, the gas pressure, airflow, concentration, and the force acting on the lower surface of the release film 11 may all be collected directly based on the corresponding sensors, or they may be obtained by processing data collected by the sensors. For example, when obtaining the force acting on the upper surface of the release film 11 of a 3D printing apparatus, the force acting on the surface of the release film 11 can be determined by detecting the volume of the printing material and converting it to weight, and the force acting on the surface of the release film 11, that is, the balance of the force acting on the upper and lower surfaces of the film, can be determined by installing a weight sensor at the bottom of the tray and detecting the total weight of the tray and printing material.

[0114] In response to this, in one embodiment, the molding platform 4 has a relief design 83 to accommodate the auxiliary member 84. This relief design 83 prevents the molding platform 4 from being pressed against the auxiliary member 84 when it descends during 3D printing. If the molding platform 4 is pressed against the auxiliary member 84, the first layer of printing will become thicker because the auxiliary member 84 has a certain thickness, which could lead to printing failures such as the printed material falling off the molding platform 4.

[0115] In one embodiment, the relief design 83 is at least one of relief chamfers, relief grooves, etc. Specifically, the position of the molding platform 4 corresponding to the auxiliary member 84 may be directly cut out, or a concave structure may be provided at the position of the molding platform 4 corresponding to the auxiliary member 84 so that the corresponding auxiliary member 84 can be accommodated.

[0116] Specifically, as shown in the embodiments in Figures 7 to 11, relief chamfers are formed on the molding platform 4 at positions corresponding to the auxiliary members 84. In the embodiments shown in Figures 13 to 15, corresponding relief grooves are provided on the periphery of the molding platform 4 so as to shift away from the auxiliary members 84 when the molding platform 4 descends. Similarly, the same relief design can be applied to the embodiments shown in Figures 6 to 8 of this embodiment.

[0117] In the 3D printing apparatus according to the embodiments of this disclosure, the pulsed peeling module may be configured as an independently controllable module. When pulsed peeling is required, the control system 6 simply transmits an operation signal to the gas oscillation assembly 31, causing the air supply pipeline 32 to output a pulsed airflow with a predetermined pulse frequency and output pressure, thereby forming a closed-loop control system. The installation and control methods of the airflow pipeline are simple. The pulsed peeling module may also be controlled by the control system of the 3D printer as part of the 3D printing apparatus.

[0118] In some embodiments, the support assembly 2 is provided on a base 81 which is part of the housing of the 3D printing apparatus.

[0119] In a fourth aspect of the embodiments of this disclosure, a 3D printing method is provided, which, as shown in Figure 10, uses the 3D printing apparatus according to the above embodiment and includes the following steps 1 to 3.

[0120] Step 1 involves obtaining a set of slice images corresponding to the 3D model to be printed, and calculating the printing difficulty corresponding to each layer of slice images.

[0121] Specifically, a 3D model of the printed material 7 is input into a computer, a control system 6 installed on the computer obtains a set of slice images corresponding to the printed material 7, and the printing difficulty corresponding to each layer of slice image is calculated based on the cross-sectional information corresponding to the slice images. For the method of determining the printing difficulty, refer to the patent document in Chinese Patent Application No. 202310235431.5.

[0122] In step 2, the printing parameters and pulsed airflow parameters corresponding to the sliced ​​image of each layer are determined based on the printing difficulty.

[0123] Specifically, the determination of printing parameters can be found in the patent document of Chinese Patent Application No. 202310235431.5. The pulse airflow parameters include pulse frequency and output pressure. There is a proportional relationship between pulse frequency and printing difficulty. The higher the printing difficulty, the higher the pulse frequency. This indicates that when the printing difficulty is high, there are generally situations such as a large number of cross-sections in the printed material 7 or a small minimum spacing between cross-sections, requiring precise printing and peeling. A higher pulse frequency results in faster oscillation and larger amplitude of the release film 11, allowing the peeling angle between the release film 11 and the bottom layer of the printed material 7 to reach the critical value θ more quickly, thereby reducing peeling force and improving peeling efficiency. Preferably, the pulse frequency range is 0.1 Hz to 50000 Hz.

[0124] The output pressure and the volume of the gas chamber are proportional. If the gas chamber volume is small and the output pressure is too high, the release film 11 will curl up, which is unfavorable for the oscillation of the release film 11. If the gas chamber volume is large and the output pressure is too low, the oscillation of the release film 11 will not be noticeable. Preferably, the range of the output pressure value is 0.1 Pa to 100,000 Pa.

[0125] In step 3, the model printing operation corresponding to the sliced ​​image of each layer is determined based on the printing parameters, and the model peeling operation corresponding to the sliced ​​image of each layer is determined based on the pulsed airflow parameters.

[0126] Specifically, a liquid photosensitive resin material is filled into a tank surrounded by a release film 11 and a tray body 12. After printing starts, the molding platform 4 is raised and lowered to print one layer at a time of the printed material 7. When printing the nth layer, the molding platform 4 is lowered, bringing the bottom of the printed material 7 into contact with the liquid photosensitive resin material in the tray. The radiation device 5 performs exposure curing based on the cross-sectional shape of the slice image corresponding to that layer. After exposure is complete, the control system 6 communicates with the gas oscillation assembly to supply a pulsed airflow into the gas chamber, releasing the vacuum adsorption state between the release film 11 and the support member 21. After the release film 11 and the support member 21 are separated... The pulsed airflow causes the release film 11 to oscillate, the molding platform 4 rises, and the peeling operation between the printed material 7 and the release film 11 begins. During model peeling, a pulsed airflow is introduced into the intake port 211 at a pulse frequency to periodically change the volume of the gas chamber, the frequency of which the change approximates the pulse frequency, causing periodic oscillation in the release film 11. The frequency and width of this oscillation effect are related to the control signal transmitted by the control system 6 to the gas oscillation assembly 31, thereby allowing the peeling angle between the release film 11 and the bottom layer of the printed material 7 to reach a critical value θ more quickly, and significantly shortening the peeling force and peeling stroke, as shown in Figure 5.

[0127] Once peeling is complete, the molding platform 4 returns to its origin position, the pulsed airflow stops or decreases, and the oscillation of the release film 11 stops or decreases. At this point, printing of the next layer (i.e., n+1 layers) can be performed.

[0128] To verify the peeling effect of the pulse peeling module according to the embodiments of this disclosure, the inventors applied the pulse peeling module according to this disclosure to HeyGears' Reflex printer and performed 3D printing using HeyGears' PAU10 material, providing the following verification embodiments.

[0129] Verification Example 1: Printing of cantilever beam models and bridge models evaluates the effectiveness of pulsed delamination and its effect on the reduction of support density. In the cantilever beam model, since the cantilever beam extends to one side, if the delamination force is too large during delamination, the cantilever beam will bend, limiting the span of the cantilever beam. When printing using conventional 3D printing equipment, the molded span is usually 1.2 mm. On the other hand, in the bridge model, if there is a large span between the two support points, if the delamination force is too large, the intermediate beam will bend. To avoid this problem, it is often necessary to improve the support density. When printing PAU10 material using conventional 3D printing equipment, the span between the two support points is limited to only 2.6 mm.

[0130] When printing using a Reflex printer equipped with a pulsed peel module, the peeling force is reduced, improving the effectiveness of peeling in pulsed peel mode, increasing the cantilever beam forming span from 1.2 mm to 1.6 mm, the bridge model forming span from 2.6 mm to 3.4 mm, and reducing the support density by 20% based on equivalent calculations.

[0131] Verification Example 2: For miniature printing, the improvement in the success rate of printing fine parts by pulse peeling, as well as the optimization effect of peeling force and printing time, were evaluated. Due to the small size of the miniatures, both the difficulty of printing and peeling are high, and when printing using conventional 3D printing equipment, it is possible that some details cannot be printed completely.

[0132] When printing using a Reflex printer equipped with a pulsed peel module, perfect printing can be achieved on miniatures, and the peel force value during printing is reduced by 20% to 50%, while the printing time is shortened by 40%.

[0133] Verification Example 3: Printing a test model of a detail molded part evaluates the optimization of detail molding by pulsed delamination. Because the cross-section of the test model of the detail molded part is small, when printing using a conventional 3D printing device, a cylinder with a diameter of 0.6 mm and a height of 10 mm can be fully molded in the delamination state, but incomplete molding occurs for details with an accuracy of 0.1 mm.

[0134] When printing using a Reflex printer equipped with a pulsed peel module, a cylinder with a diameter of 0.3 mm and a height of 10 mm can be perfectly formed, and the minimum formed detail can be within 0.08 mm.

[0135] Verification Example 4: Printing of long-run test parts for life evaluation evaluates the optimization of tray life through pulsed peeling.

[0136] When printing using a Reflex printer equipped with a pulsed release module, there are no abnormalities in the surface quality of the released print 7, and the release force of the release film 11 in this disclosure is significantly reduced compared to conventional trays, thus improving the lifespan of the release film 11 by 27% to 38%.

[0137] Verification Example 5: Printing of test parts for peel stroke evaluation evaluates the optimization of the peel stroke by pulse peeling. As shown in Figures 4 and 5, when printing using a conventional 3D printing apparatus, the release film 11 in the tray assembly 1 undergoes elastic deformation due to the tensile force from the bottom layer of the printed material 7 until the peel angle between the bottom layer of the printed material 7 and the release film 11 reaches a critical value θ, resulting in a long peel stroke as shown in Figure 4.

[0138] When printing using a Reflex printer equipped with a pulsed release module, the release film 11 can generate high-frequency oscillations under the action of a pulsed airflow. As a result, the peel angle between the bottom layer of the printed material 7 and the release film 11 can reach a critical value θ more quickly. This allows the peel stroke to be shortened by 32% to 47%, as shown in Figure 5, which is advantageous for improving peel efficiency.

[0139] As can be seen from the above embodiments, the pulsed peel module and pulsed peel tray according to the embodiments of this disclosure can significantly reduce the peeling force during peeling, which is advantageous for improving the molding accuracy of the model, improving the effectiveness of pulsed peeling, and improving the lifespan of the release film 11. After shortening the peeling stroke, the peeling time can be significantly reduced, improving peeling efficiency and reducing printing time.

[0140] This disclosure provides a three-dimensional printing system comprising: a tray assembly having at least partially transparent release film; a support assembly having at least partially transparent support members, a gas chamber formed between the support members and the release film, the gas chamber communicating with an intake port and an exhaust port; and a gas supply assembly configured to supply gas to the gas chamber and periodically change the volume of the gas chamber.

[0141] In some embodiments, the support member and the release film define the gas chamber. In other embodiments, the support member, the release film, and the sealing member define the gas chamber. When the molding platform drives the release film toward the support member, a vacuum is created between the release film and the support member, which is unfavorable for the subsequent separation of the molding platform (and the release film adhering to the molding platform) from the support member. Gas supplied by the gas supply assembly is introduced into the gas chamber to at least partially relieve the vacuum, thereby facilitating the separation of the release film from the support member.

[0142] To facilitate the separation of the molding platform (or the cured object thereon) from the release film, the gas chamber of the present disclosure has a volume or capacity that changes during the delamination process (i.e., the process in which the molding platform moves away from the release film or away from the support member). As the volume or capacity of the gas chamber changes continuously or periodically, the air pressure inside the gas chamber increases or decreases. During the process in which the air pressure decreases, the release film is subjected to a force that tends to move it closer to the support member, while the cured object on the molding platform continues to be subjected to a force that tends to move it away from the support member, so that the cured object on the molding platform is more easily separated from the release film.

[0143] During delamination, the degree of stretching of the release film increases as the molding platform moves away from the release film or the support member. After a predetermined delamination stroke, the delamination force between the cured object on the molding platform and the release film reaches a predetermined delamination force, thereby separating the cured object on the molding platform from the release film. Because a pulsed airflow is provided (or the volume or capacity of the gas chamber changes continuously or periodically), the delamination force between the cured object on the molding platform and the release film reaches a predetermined delamination force at a distance smaller than the predetermined delamination stroke, thereby separating the cured object on the molding platform from the release film. This shortens the overall delamination stroke and allows the molding platform to move at a faster speed after delamination is complete, thus reducing the overall time required for the printing process.

[0144] In some embodiments, the gas supply assembly intermittently supplies gas to the gas chamber, i.e., it repeatedly operates by starting up for a certain period of time and then stopping for a certain period of time. For example, it starts up for 1 second and stops for 0.5 seconds.

[0145] In some embodiments, the gas supply assembly supplies gas to the gas chamber at different flow rates, and the gas in the gas chamber is discharged through the exhaust port at the same flow velocity. For example, let a be the flow velocity of the gas discharged from the exhaust port, the intake flow velocity in the first period be 1.2a, the intake flow velocity in the subsequent second period be 1.5a, and the intake flow velocity in the subsequent third period be 0.8a.

[0146] The terms used herein are intended solely to describe specific embodiments and are not intended to be limiting. Where the singular forms “one,” “one,” and “the said” are used, they are also intended to include the plural form unless the context explicitly indicates otherwise. The terms “include,” “equip,” “contain,” and “have” are inclusive and can identify the presence of the described features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations of the methods described herein should not necessarily be construed as requiring a specific order unless specifically identified as such. It should also be understood that additional or alternative steps may be used.

[0147] Terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers, and / or compartments, but these elements, components, regions, layers, and / or compartments should not be limited by these terms. These terms may be used solely to distinguish one element, component, region, layer, or compartment from other elements, components, regions, layers, or compartments. Where used herein, terms such as "first," "second," and other numerical terms do not mean procedures or sequences unless expressly indicated by the context. Accordingly, the first "element, component, region, layer, or compartment" described below may be referred to as the second "element, component, region, layer, or compartment" without departing from the teaching of the exemplary embodiments.

[0148] The foregoing describes only specific embodiments of the Disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the Disclosure. Therefore, the Disclosure should not be limited to these embodiments shown herein, but should encompass the broadest scope that is consistent with the principles and novel features disclosed herein. [Industrial applicability]

[0149] The technical means according to the embodiments of the present disclosure can be applied to the technical field of 3D printing. In the embodiments of the present disclosure, the provided pulsed release module includes a tray assembly, a support assembly, and a pulsed gas supply assembly, which introduces a pulsed airflow into the gas chamber, thereby periodically changing the gas volume in the gas chamber, generating periodic oscillations in the release film, and further enabling the rapid release of the vacuum adsorption state between the release film and the support member, which is advantageous in shortening the release force and release stroke, improving printing efficiency and success rate, and reducing the risk of dropping. In the embodiments of the present disclosure, the provided pulsed release tray includes a release film and a support member, a gas chamber formed between the support member and the release film, and the support member is provided with an intake port and an exhaust port communicating with the gas chamber for connection to the pulsed gas supply assembly. In the embodiments of the present disclosure, the provided 3D printing apparatus includes the pulsed release module and the pulsed release tray. In embodiments of the present disclosure, the provided 3D printing method includes a step of controlling a pulsed airflow, thereby generating periodic oscillations in the release film and further enabling rapid release of the vacuum adsorption state between the release film and the support member, which is advantageous in shortening the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping. In embodiments of the present disclosure, the provided 3D printing system includes a tray assembly, a support assembly, and a gas supply assembly, which generates periodic oscillations in the release film and further enables rapid release of the vacuum adsorption state between the release film and the support member, which is advantageous in shortening the peeling force and peeling stroke, improving printing efficiency and success rate, and reducing the risk of dropping. As can be seen therein, the pulsed peeling module according to embodiments of the present disclosure can improve printing efficiency and success rate and reduce the risk of dropping. [Explanation of symbols]

[0150] d, peeling stroke, 1. Tray assembly, 11. Release film, 12. Tray body, 13. Position sensor, 2. Support assembly, 21. Support member, 21a. Transparent rigid support member, 21b. Transparent flexible support member, 211. Intake port, 212. Exhaust port, 22. Sealing member, 22a. First sealing member, 22b. Second sealing member, 221. Flow port, 23. Rigid substrate, 24. Connecting member, 3. Pulse gas supply assembly, 31. Gas oscillation assembly, 32. Air supply pipeline, 33. Gas source, 34. Control valve, 4. Molding platform, 5. Radiation device, 6. Control system, 7. Printed material, 81. Base, 82. Molding surface, 83. Relief design, 84. Auxiliary member, 100, Gas Chamber

Claims

1. A tray assembly (1), wherein the tray assembly (1) comprises a tray assembly (1) having a release film (11), A support assembly (2) is provided below the tray assembly (1), and the support assembly (2) has a support member (21), and in order to form a gas chamber (100) between the support member (21) and the release film (11), the support member (21) and the release film (11) are separated by a first predetermined distance in the height direction, and the support member (21) is provided with an intake port (211) and an exhaust port (212) that communicate with the gas chamber (100), A pulsed gas supply assembly (3), the pulsed gas supply assembly (3) comprising a gas oscillation assembly (31) and an air supply line (32), wherein the gas oscillation assembly (31) is provided in the air supply line (32), and the air supply line (32) is connected to the air intake port (211), and the pulsed gas supply assembly (3) is characterized by comprising the pulsed gas supply assembly (3).

2. The pulse peel module according to claim 1, characterized in that a sealing member (22) is provided along the circumferential direction of the support member (21), and the sealing member (22) is connected to the tray assembly (1).

3. The pulse peeling module according to claim 2, characterized in that the sealing member (22) is provided with a flow port (221) that communicates with the gas chamber (100).

4. An auxiliary member (84) is provided on the side of the support member (21) facing the release film (11), and as a result, when the release film (11) is in close contact with the support member (21) and tends to move away from the support member (21), there is a peel angle between the release film (11) and the support member (21), as described in claim 1.

5. The pulse peel module according to claim 4, characterized in that the number of auxiliary members (84) is at least two, and they are provided dispersed along the circumferential direction of the support member (21) so as to form the gas chamber (100) whose height matches that of the support member (21) and the release film (11).

6. The pulse peeling module according to claim 5, characterized in that the number of auxiliary members (84) is four, each provided corresponding to one of the four corners of the support member (21), and / or the number of auxiliary members (84) is four, each provided corresponding to one of the four edges of the support member (21).

7. The pulse peeling module according to claim 4, characterized in that the auxiliary member (84) is a combination of one or more of the following: tape, plastic plate, metal gasket, urethane foam, wooden plate, and fiber cloth.

8. The pulsed separation module according to claim 1, further comprising a control valve (34) that controls the flow of gas into the gas chamber (100) according to a predetermined requirement, wherein the pulsed gas supply assembly (3) further includes a control valve (34) that controls the flow of gas into the gas chamber (100) according to a predetermined requirement.

9. The pulse peeling module according to any one of claims 1 to 8, characterized in that the support member (21) is a transparent rigid support member (21a) or a transparent flexible support member (21b).

10. The pulse peeling module according to claim 9, characterized in that, if the support assembly (2) is a transparent flexible support member (21b), the support assembly (2) further includes a rigid substrate (23) provided below the transparent flexible support member (21b).

11. The pulse peel module according to claim 1, characterized in that the support member (21) is one or more combinations of the following: fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, heat-sensitive resin, glass, and screen.

12. A pulsed release tray, the pulsed release tray having a release film (11) and a support member (21), wherein the support member (21) and the release film (11) have a second predetermined distance in the height direction in order to form a gas chamber (100) between the support member (21) and the release film (11), and the support member (21) is provided with an intake port (211) and an exhaust port (212) communicating with the gas chamber, respectively. A pulse peel tray characterized in that the intake port (211) and the exhaust port (212) are connected to a pulse gas supply assembly (3).

13. The pulse peel tray according to claim 12, characterized in that the support member (21) is a transparent flexible support member (21b).

14. The pulse peel tray according to claim 13, characterized in that the transparent flexible support member (21b) is one or more of the following: fluorine-containing polymer film, polydimethylsiloxane film, polymethylpentene film, acrylic adhesive, polymethyl methacrylate, polytetrafluoroethylene, polyethylene terephthalate, fluoroethylene-ethylene copolymer, polyethylene, polypropylene, polyvinyl chloride, photosensitive resin, and heat-sensitive resin.

15. The pulse peel tray according to claim 13, characterized in that the support member (21) further includes a rigid substrate (23) provided below the transparent flexible support member (21b).

16. An auxiliary member (84) is provided on the side of the support member (21) facing the release film (11), thereby creating a gap between the release film (11) and the support member (21) when the release film (11) is in close contact with the support member (21) and tends to move away from the support member (21), as described in claim 12.

17. The pulse peel tray according to claim 16, wherein the number of auxiliary members (84) is at least two, and they are provided dispersed along the circumferential direction of the support member (21) so as to form the gas chamber (100) whose height matches that of the support member (21) and the release film (11).

18. The pulse peel tray according to claim 17, characterized in that the number of auxiliary members (84) is four, each provided corresponding to one of the four corners of the support member (21), and / or the number of auxiliary members (84) is four, each provided corresponding to one of the four edges of the support member (21).

19. The pulse peel tray according to claim 18, characterized in that the auxiliary member (84) is a combination of one or more of the following: tape, plastic plate, metal gasket, urethane foam, wooden board, and fiber cloth.

20. The pulse release tray according to claim 12, further comprising a tray body (12), wherein the tray body (12) is provided with a position sensor (13) for detecting position data of the release film (11).

21. A 3D printing apparatus comprising a pulse peel module according to any one of claims 1 to 11 or a pulse peel tray according to any one of claims 12 to 20, further comprising a molding platform (4), a radiation device (5), and a control system (6), wherein the molding platform (4) is provided above the tray assembly (1), the radiation device (5) is provided below the support assembly (2), and the control system (6) is associated with the molding platform (4), the radiation device (5), and the pulse gas supply assembly (3), respectively.

22. The 3D printing apparatus according to claim 21, characterized in that the control system (6) communicates with the pulse gas supply assembly (3) to generate control commands based on a predetermined control policy and transmit them to the pulse gas supply assembly (3).

23. The aforementioned control policy is: The system is configured to generate and transmit a first control command if one or more of the following are detected: the release film (11) of the 3D printer is higher than a predetermined calibration position; the gas pressure inside the 3D printer is higher than a predetermined pressure range; the gas airflow inside the 3D printer is higher than a predetermined range; the gas concentration inside the 3D printer is higher than a predetermined concentration range; and the force acting on the lower surface of the release film (11) of the 3D printer is greater than the force acting on the upper surface, and the first control command includes controlling the pulse gas supply assembly (3) to reduce the amount of gas it supplies, or The 3D printing apparatus according to claim 22, characterized in that when one or more of the following are detected: the release film (11) of the 3D printing apparatus is lower than a predetermined calibration position; the gas pressure inside the 3D printing apparatus is lower than a predetermined pressure range; the gas airflow inside the 3D printing apparatus is lower than a predetermined range; the gas concentration inside the 3D printing apparatus is lower than a predetermined concentration range; and the force acting on the upper surface of the release film (11) of the 3D printing apparatus is less than the force acting on the lower surface, the apparatus is configured to generate and transmit a second control command, the second control command includes controlling the pulse gas supply assembly (3) to increase the amount of gas supplied.

24. The 3D printing apparatus according to claim 21, characterized in that the molding platform (4) has a relief design (83) for accommodating an auxiliary member (84).

25. The 3D printing apparatus according to claim 24, characterized in that the relief design (83) is at least one of relief chamfers and relief grooves.

26. A 3D printing method using a 3D printing apparatus according to any one of claims 21 to 25, The steps include obtaining a set of slice images corresponding to a 3D model to be printed, and calculating the printing difficulty corresponding to each slice image of each layer, The steps include determining the printing parameters and pulsed airflow parameters corresponding to the sliced ​​image of each layer based on the printing difficulty, A 3D printing method characterized by comprising the steps of: determining a model printing operation corresponding to the slice image of each layer based on the printing parameters; and determining a model peeling operation corresponding to the slice image of each layer based on the pulsed airflow parameters.

27. The 3D printing method according to claim 26, characterized in that the pulse airflow parameter includes a pulse frequency, and the pulse frequency and the printing difficulty are in a proportional relationship.

28. The 3D printing method according to claim 27, characterized in that the model peeling operation includes introducing a pulsed airflow into the intake port (211) at the pulse frequency during model peeling to periodically change the volume of the gas chamber (100) and generate periodic oscillations in the release film (11).

29. A tray assembly (1) having a release film (11), A support assembly (2) comprising a support member (21), wherein a gas chamber (100) is formed between the support member (21) and the release film (11), and the gas chamber (100) is in communication with an intake port (211) and an exhaust port (212). A three-dimensional printing system characterized by including a gas supply assembly configured to supply gas to the gas chamber 100 and periodically change the volume of the gas chamber.

30. The three-dimensional printing system according to claim 29, characterized in that the gas supply assembly is configured to intermittently supply gas to the gas chamber (100).

31. The three-dimensional printing system according to claim 29, characterized in that the gas supply assembly supplies gas to the gas chamber (100) at different flow rates, and the gas in the gas chamber (100) is discharged through the exhaust port (212) at the same flow rate.

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