Three-dimensional composite film, material box and 3D printer

Abstract

The utility model discloses a three-dimensional composite film, a material box and a 3D printer, the three-dimensional composite film comprises a release layer, the release layer comprises a release film, the first surface of the release film is provided with a coarsening part, and the light transmittance of the release film is greater than 90%; the soft rubber layer comprises at least one layer of soft rubber film, and the light transmittance of the soft rubber film is greater than 90%; the bonding layer is connected between the release layer and the soft rubber layer, the viscosity of the bonding layer is larger than 1000 cps, and the light transmittance of the bonding layer is larger than 90%. According to the three-dimensional composite film, the material box and the 3D printer disclosed by the utility model, the adhesive force is reduced, the separation is easy, the printing success rate is improved, and the service life of the release film is prolonged while the low adhesive force of the release film is maintained.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing additive manufacturing, and in particular to a three-dimensional composite film, a material box and a 3D printer. Background Art

[0002] According to the molding method, light-curing 3D printers can be divided into two types: lift-up type and sinking type. During the printing process of the lift-up type, the curing part and the projection window need to be continuously separated. The force required for separation is the 3D printing release force.

[0003] The release force mainly consists of three parts: viscous resistance, vacuum negative pressure and adhesion.

[0004] When the printing platform moves upward, it needs to overcome the shearing effect of the liquid resin, which generates viscous resistance. The viscous resistance is related to the size of the printing platform, the viscosity of the resin, and the lifting speed of the platform. Since the size of the printed parts is generally not large, the lifting speed of the platform and the viscosity of the resin are within a certain range, so this force is usually not large;

[0005] When the printing device and the projection window are separated, a gap will be generated because the resin cannot be replenished in time, forming a vacuum negative pressure area, which generates a vacuum negative pressure that needs to be overcome during release. At the rigid curing interface, the vacuum negative pressure plays a dominant role.

[0006] Adhesion is the ability of a material to adhere to the surface of other materials. Photosensitive resin is essentially an adhesive that adheres to the projection window when it is cured. When the curing interface is a flexible material, the interface deformation causes the separation process to proceed in a gradual manner of crack expansion, and resin replenishment becomes easier, and the negative pressure decreases. At this time, adhesion plays a dominant role.

[0007] The release film with low surface energy can reduce the adhesion of the resin after curing. This is achieved by fixing a layer of release film between the resin and the projection window as a light curing interface.

[0008] In the current photocuring 3D printing process, in order to facilitate the peeling of photosensitive resin parts, a release film is covered on the bottom of the resin tank. This type of release film is generally made of transparent perfluoroethylene propylene copolymer (FEP) material. Perfluoroethylene propylene copolymer is a polymer with low surface energy and high thermal stability. This adhesion is conducive to the peeling of resin molded parts and reduces damage to the peeled parts.

[0009] For example, the Chinese utility model patent with application number 201920232004.0, application date February 20, 2019, and authorization date October 18, 2019 provides a 3D printing material tray, including a base, a release film, a light-transmitting glass, and a splint. The release film is arranged on the top surface of the base and pressed between the base and the splint. The light-transmitting glass is arranged between the base and the release film. The release film, the inner wall of the first groove, and the light-transmitting glass are arranged to form a first chamber. The release film and the inner wall of the second groove are arranged to form a second chamber. The utility model easily realizes the bonding or separation of the release film and the light-transmitting glass by adjusting the pressure of the gas in the first chamber and the second chamber, thereby realizing precise printing.

[0010] However, when the photosensitive resin is converted from liquid to solid, it will adhere to the release film. During the process of repeated stretching and peeling of the resin molded part in the Z-axis direction, the single-layer release film still has a large release force as a photocuring interface, which often makes it impossible to separate the printed part from the release film. The printed part itself is subjected to greater stress and its structure is damaged, resulting in a low success rate of the printing process.

[0011] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0012] The utility model aims to provide a three-dimensional composite film, a material box and a 3D printer, so that the printed part and the release film can be separated more easily and the success rate of printing can be improved.

[0013] In order to solve the above technical problems, the utility model provides a three-dimensional composite film, including:

[0014] A release layer, comprising a release film, a roughened portion being provided on a first surface of the release film, and a light transmittance of the release film being greater than 90%;

[0015] The soft adhesive layer comprises at least one layer of soft adhesive film, wherein the light transmittance of the soft adhesive film is greater than 90%;

[0016] The connecting layer is connected between the release layer and the soft adhesive layer, the viscosity of the connecting layer is greater than 1000 cps, and the light transmittance of the connecting layer is greater than 90%.

[0017] Preferably, the release film has a thickness of 0.01 mm-0.3 mm, the soft adhesive film has a thickness of 0.1 mm-30 mm, the three-dimensional composite film has a thickness of 0.05 mm-30 mm, and the light transmittance of the three-dimensional composite film is greater than 90%.

[0018] Preferably, the release layer material includes one or more of fluorinated ethylene propylene, polyvinylidene fluoride, polytetrafluoroethylene, polymethylpentene, ethylene-tetrafluoroethylene copolymer, soluble polytetrafluoroethylene, polyimide, polyethylene terephthalate, biaxially oriented polypropylene, and polycarbonate.

[0019] Preferably, the soft rubber layer material includes one or more of thermoplastic polyurethane, silicone, rubber, silicone rubber, and polydimethylsiloxane.

[0020] Preferably, the bonding layer material includes one or more of acrylic acid, silicone glue, and OCA optical glue.

[0021] In a second aspect, the utility model further provides a material box, comprising:

[0022] A box body having a cavity with openings at both ends;

[0023] A clamping assembly having an annular opening and disposed on an opening at one end of the box body;

[0024] The three-dimensional composite film is tightened by the clamping assembly and covers the opening at one end of the box body, and the release layer is arranged toward the cavity.

[0025] Preferably, the clamping assembly comprises a first clamping piece and a second clamping piece which are overlapped, and the three-dimensional composite film is clamped between the first clamping piece and the second clamping piece and covers the annular opening.

[0026] Preferably, the box body is provided with a mounting groove on the opening end surface where the clamping assembly is provided, and the clamping assembly is provided in the mounting groove.

[0027] Preferably, the mounting groove has a first side wall and a second side wall that are arranged opposite to each other, the first side wall is arranged close to the cavity, and the height of the first side wall is greater than the total thickness of the first clip / the second clip and the three-dimensional composite film.

[0028] In a third aspect, the utility model further provides a 3D printer, comprising the above-mentioned three-dimensional composite film or the above-mentioned material box.

[0029] Compared with the prior art, the utility model has the following advantages:

[0030] The three-dimensional composite film of the utility model is composited with a release film and a soft adhesive film so that the three-dimensional composite film has a two-layer structure of a release layer and a soft adhesive layer. While maintaining the low adhesion of the release film, the three-dimensional composite film can produce a certain recoverable deformation in the process of adhesion-separation. This deformation can solidify the interface in the form of crack expansion, thereby reducing adhesion, making separation easier, greatly improving the success rate of printing, and increasing the service life of the release film. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances. In the drawings:

[0032] Figure 1 It is a flow chart of the method for preparing the three-dimensional composite film in the utility model;

[0033] Figure 2 It is a schematic diagram of the structure of the three-dimensional composite film in the utility model;

[0034] Figure 3 yes Figure 2 A magnified schematic diagram of the middle part;

[0035] Figure 4 It is a cross-sectional view of the material box in the utility model;

[0036] Figure 5 It is a structural schematic diagram of the clamping assembly in the utility model;

[0037] Figure 6 It is a structural schematic diagram of the first clamp in the utility model;

[0038] Figure 7 It is a structural schematic diagram of the second clamp in the utility model;

[0039] Figure 8 It is a structural schematic diagram of the bottom of the box body in the utility model. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] like Figure 1 As shown, a method for preparing a three-dimensional composite film according to a preferred embodiment of the present invention comprises the following steps:

[0044] S1: Prepare release layer 11: Select a release film with a thickness of 0.01mm-0.3mm. Before the composite processing, use a precision laminating machine to laminate a layer of single-sided protective film on the second surface of the release film to prevent the release layer 11 from being scratched or torn during the processing, which may affect the subsequent performance. Preferably, in this embodiment, the single-sided protective film is made of silicone.

[0045] The first surface 111 of the release film is roughened to activate the surface functional groups of the release layer 11 to achieve a roughening effect, thereby enhancing the adhesive force. Further, even after the roughening treatment, the light transmittance of the release film is still greater than 90%, which can meet the subsequent printing requirements.

[0046] In this embodiment, the release layer 11 material includes one or more combinations of fluorinated ethylene propylene (FEP), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polymethylpentene (TPX), ethylene-tetrafluoroethylene copolymer (ETFE), soluble polytetrafluoroethylene (PFA), polyimide (PI), polyethylene terephthalate (PET), biaxially oriented polypropylene (BOPP), and polycarbonate (PC).

[0047] S2: Preparation of soft adhesive layer 12: It should be explained that in the three-dimensional composite film, the role of the soft adhesive layer 12 is to produce a certain recoverable deformation when the release layer 11 is separated from the photosensitive resin material, so that the separation is easier to achieve. The soft adhesive layer 12 can not only bear the buffering force and reduce the stress, but also prevent adhesion with the bottom light source mask layer. At the same time, in order to ensure the printing effect, the light transmittance of the soft adhesive film is greater than 90%.

[0048] Preferably, the material of the soft rubber layer 12 includes one or more combinations of thermoplastic polyurethane, silicone, rubber, silicone rubber, and polydimethylsiloxane.

[0049] The specific preparation of the soft adhesive layer 12 includes: weighing suitable material proportions, adding various platinum catalysts, hydrogen-containing silicone oil, delay agents, internal coupling agents, preparing soft adhesive raw materials, and calendering to form a soft adhesive film. Preferably, the thickness of the soft adhesive film is 0.1mm-30mm.

[0050] S3: Coating a coupling agent on the first surface 111 of the release film and pasting it on the soft adhesive film, after curing, forming a coupling layer 13 composite release layer 11 and soft adhesive layer 12, which is responsible for the physical connection between the release layer 11 and the soft adhesive layer 12. In order to ensure that there is no delamination during repeated pulling during the printing process, the viscosity of the selected coupling layer 13 is greater than 1000cps. Further, in order to ensure the subsequent printing quality, the light transmittance of the coupling layer is greater than 90%. Specifically, the material of the coupling layer 13 can be one or more of acrylic acid, silicone glue, and OCA optical glue.

[0051] In the composite process, it is preferred to use a precision calender, set the corresponding thickness, pressure, tension, and surface temperature of the calender roller, and press the release film, soft film, and coupling agent; use a specific surface smoothing agent to spray evenly onto the material sheet through a spraying device; after the treatment is completed, send it into an oven set with a temperature parameter of 120-180 degrees for curing and curing for 3-10 minutes. After curing, a three-dimensional composite film is obtained. In this embodiment, the thickness of the three-dimensional composite film is 0.05mm-0.8mm.

[0052] The utility model also proposes a three-dimensional composite film, which is prepared by the above-mentioned three-dimensional composite film preparation method. The three-dimensional composite film can be referred to as ACF film due to its materials and processes. Its structure includes a release layer 11, a soft glue layer 12 and a connecting layer 13 connected between the release layer 11 and the soft glue layer 12.

[0053] The release layer 11 includes a release film, a single-sided protective film is provided on the second surface of the release film to prevent damage to the surface properties, and a roughened portion 112 is provided on the first surface 111 of the release film to enhance the adhesive force. Preferably, under the influence of the roughened portion 112, the light transmittance of the release film is still greater than 90% to meet the subsequent printing requirements. In this embodiment, the release layer 11 material includes a combination of one or more of fluorinated ethylene propylene (FEP), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polymethylpentene (TPX), ethylene-tetrafluoroethylene copolymer (ETFE), soluble polytetrafluoroethylene (PFA), polyimide (PI), polyethylene terephthalate (PET), biaxially oriented polypropylene (BOPP), and polycarbonate (PC).

[0054] The soft adhesive layer 12 includes at least one layer of soft adhesive film, which has a certain deformation ability, making separation easier to achieve, and can not only bear the buffering force to reduce stress, but also prevent adhesion with the bottom light source mask layer. At the same time, in order to ensure the printing effect, the light transmittance of the soft adhesive film is greater than 90%. The material of the soft adhesive layer 12 includes one or more combinations of thermoplastic polyurethane, silicone, rubber, silicone rubber, and polydimethylsiloxane.

[0055] The bonding layer 13 is formed by curing the bonding agent, and is responsible for the physical connection between the release layer 11 and the soft adhesive layer 12. In order to ensure that there is no delamination during repeated pulling during the printing process, the viscosity of the selected bonding layer is greater than 1000cps. Furthermore, in order to ensure the subsequent printing quality, the light transmittance of the bonding layer is greater than 90%. Specifically, the bonding layer material can be one or more of acrylic acid, silicone glue, and OCA optical glue.

[0056] The thickness of the three-dimensional composite film of this embodiment after compounding is between 0.05mm and 30mm, and the transmittance after compounding is greater than 90%. While maintaining the low adhesion of the release film, the three-dimensional composite film can produce a certain recoverable deformation during the adhesion-separation process. This deformation can solidify the interface in the form of crack expansion, thereby reducing adhesion and making separation easier, greatly improving the success rate of printing and increasing the service life of the release film.

[0057] The utility model further provides a material box, comprising a box body 4, a clamping assembly 5 and the above-mentioned three-dimensional composite film 1.

[0058] The box body 4 has a cavity 41 with two ends open, and its cross-sectional shape is not limited, and can be square, circular or other polygonal, etc. The figure shows an example in which the cross-sectional shape of the box body is square. The cavity 41 is used to hold the resin material for 3D printing.

[0059] The three-dimensional composite film 1 completely covers the opening at one end of the box body 4 and is tightened and fixed by the clamping assembly 5. The three-dimensional composite film includes a release layer 11, a soft glue layer 12, and a connecting layer 13 connected between the release layer 11 and the soft glue layer 12. The release layer 11 is arranged toward the cavity 41. The three-dimensional composite film 1 is used as a release film in the material box. While maintaining the low adhesion of the release layer, the soft glue layer 12 can make the three-dimensional composite film produce a certain recoverable deformation during the adhesion-separation process. This deformation can solidify the interface in the form of crack expansion, reduce the adhesion, and make separation easier. On the other hand, it is used as the bottom of the material box to support the resin material.

[0060] The clamping assembly 5 has an annular opening 51, which is arranged on an opening at one end of the box body 4, and the shape of the clamping assembly is arranged corresponding to the cross-sectional shape of the box body 4. Preferably, the clamping assembly 5 includes a first clamp 52 and a second clamp 53 which are overlapped, and the three-dimensional composite film 1 is sandwiched between the first clamp 52 and the second clamp 53, and covers the annular opening 51. The first clamp 52 includes one or more first bodies 521. When the number of the first body 521 is one, the first clamp 52 is an annular integrated structure; when the number of the first body 521 is multiple, the first clamp 52 is a split structure, and multiple first bodies 521 surround to form the annular opening 51; similarly, the second clamp 53 includes one or more second bodies 531. When the number of the second body 531 is one, the second clamp 53 is an annular integrated structure; when the number of the second body 531 is multiple, the second clamp 53 is a strip-shaped or block-shaped split structure, and multiple second bodies 531 surround to form the annular opening 51. The first clip 52 and the second clip 53 may be in the same or different form, which is not further limited here. As shown in the figure, the first clip 52 and the second clip 53 are both annular integral structures, which is convenient for subsequent fixed installation.

[0061] The first clamp 52 is provided with a plurality of first threaded through holes 522, and the second clamp 53 is provided with a plurality of second threaded through holes 532. The first threaded through holes 522 and the second threaded through holes 532 are arranged correspondingly, and the three-dimensional composite film 1 is clamped between the first clamp 52 and the second clamp 53, and is tightened and fixed by screws cooperating with the first threaded through holes 522 and the second threaded through holes 532.

[0062] The box body 4 is provided with a mounting groove 42 on the open end face where the clamping assembly 5 is provided, and the clamping assembly 5 is provided in the mounting groove 42. The mounting groove 42 has a first side wall 421 and a second side wall 422 which are arranged opposite to each other. The first side wall 421 is arranged close to the cavity 41, and the height of the first side wall is greater than the total thickness of the first clip 52 / the second clip 53 and the three-dimensional composite film 1. When the clamping assembly 5 is installed, when the first clip 52 / the second clip 53 is placed in the mounting groove 42, the first side wall 421 will abut against and push the three-dimensional composite film 1, so that the three-dimensional composite film 1 is in a taut state, which can make the bottom wall of the cavity 41 sealed to support the resin material on the one hand, and can make the release layer 11 ready for printing on the other hand. Preferably, a plurality of third threaded through holes 54 are provided on the clamping assembly 5, and a plurality of fourth threaded through holes 43 are provided in the mounting groove 42, which are tightened and fixed by the cooperation of the screws with the third threaded through holes 54 and the fourth threaded through holes 43.

[0063] The material box in this embodiment uses a three-dimensional composite film as the bottom of the material box. On the one hand, it is used as a release film. While maintaining low adhesion of the release layer, it facilitates the separation of the release film and the projection plane, thereby improving the success rate of printing, increasing the service life of the release film, and reducing printing costs. On the other hand, it is used as the bottom of the material box to support the resin material. It is easy to use and facilitates the replacement of consumables in the later stage.

[0064] This embodiment also provides a 3D printer, which should have the above-mentioned material box. It should be noted that the 3D printer provided in this embodiment and the embodiment of the material box or the three-dimensional composite film belong to the same concept, that is, the 3D printer is based on the material box or the three-dimensional composite film, and its specific implementation process is detailed in the embodiment of the three-dimensional composite film or the material box, which will not be repeated here.

[0065] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of the subject matter, nor should it be considered that the applicant has not considered the subject matter as part of the disclosed utility model subject matter.

Claims

1. A three-dimensional composite film, characterized in that: include: A release layer, comprising a release film, a roughened portion being provided on a first surface of the release film, and a light transmittance of the release film being greater than 90%; The soft adhesive layer comprises at least one layer of soft adhesive film, wherein the light transmittance of the soft adhesive film is greater than 90%; The connecting layer is connected between the release layer and the soft adhesive layer, the viscosity of the connecting layer is greater than 1000 cps, and the light transmittance of the connecting layer is greater than 90%.

2. The three-dimensional composite film according to claim 1, characterized in that: The thickness of the release film is 0.01 mm-0.3 mm, the thickness of the soft adhesive film is 0.1 mm-30 mm, the thickness of the three-dimensional composite film is 0.05 mm-30 mm, and the light transmittance of the three-dimensional composite film is greater than 90%.

3. A material box, characterized in that: include: A box body having a cavity with openings at both ends; A clamping assembly having an annular opening and disposed on an opening at one end of the box body; The three-dimensional composite film according to any one of claims 1 to 2 is tightened by the clamping assembly and covers the opening at one end of the box body, and the release layer is arranged toward the cavity.

4. The material box according to claim 3, characterized in that: The clamping assembly comprises a first clamping piece and a second clamping piece which are overlapped, and the three-dimensional composite film is sandwiched between the first clamping piece and the second clamping piece and covers the annular opening.

5. The material box according to claim 4, characterized in that: The box body is provided with a mounting groove on the opening end surface where the clamping assembly is arranged, and the clamping assembly is arranged in the mounting groove.

6. The material box according to claim 5, characterized in that: The mounting groove comprises a first side wall and a second side wall which are arranged opposite to each other, the first side wall is arranged close to the cavity, and the height of the first side wall is greater than the total thickness of the first clip / the second clip and the three-dimensional composite film.

7. A 3D printer, characterized in that: It comprises the three-dimensional composite film as described in any one of claims 1 to 3 or the material box as described in any one of claims 3 to 6.

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