A LED light strip silicone co-extrusion method, mold and LED light strip

Abstract

The present disclosure provides a method for co-extrusion of silicone rubber for LED light strips, a mold and an LED light strip thereof, and relates to the field of light strip packaging technology. The method comprises: obtaining a long strip of rubber, wherein the long strip of rubber comprises a light-blocking rubber and a diffusion rubber; feeding the light-blocking rubber, the diffusion rubber and the circuit board with lamp beads into the light-blocking rubber channel, the diffusion rubber channel and the circuit board channel in the mold respectively, and extruding the fed light-blocking rubber and the diffusion rubber to the silicone light strip outlet by means of silicone co-extrusion, so as to realize forming the light-blocking rubber and the diffusion rubber on the circuit board to obtain the silicone light strip; heating and shaping the silicone light strip extruded by the mold to obtain the LED light strip, wherein the light-blocking rubber channel, the diffusion rubber channel and the circuit board channel are connected to the silicone light strip outlet. The mold in the present disclosure is used to implement the above method, and the obtained LED light strip has good luminous uniformity.

Description

Technical Field

[0001] The present disclosure relates to the technical field of light strip packaging, and in particular to a method for co-extrusion of silicone rubber for an LED light strip, a mold and an LED light strip thereof. Background Art

[0002] At present, the production process of LED light strip packaging on the market usually adopts dispensing, and epoxy resin is used to protect the LED tube core and welding wire. The shape of the colloid after curing directly affects the brightness, luminous efficiency and luminous uniformity of the finished light source. The flexible light strip using COB or CSP flip-chip LED has the problems of low luminous efficiency, general uniformity, and cannot be used in extremely narrow spaces or spaces with strong weather resistance. The curing process of the surface mount device (SMD, Surface Mounted Devices) in the prior art takes a long time, and the uniformity is difficult to guarantee, and the production length is also limited. Summary of the invention

[0003] In view of this, the present disclosure provides a LED light strip silicone co-extrusion method, a mold and a technical solution for the LED light strip.

[0004] In a first aspect, the present disclosure provides a method for co-extruding silicone rubber of an LED light strip, comprising the following steps:

[0005] Obtaining a long strip of adhesive material, wherein the long strip of adhesive material includes a light-blocking adhesive material and a diffusion adhesive material;

[0006] Feeding the light-blocking rubber material, the diffusion rubber material and the circuit board with lamp beads into the light-blocking rubber material channel, the diffusion rubber material channel and the circuit board channel in the mold respectively, and extruding the fed light-blocking rubber material and the diffusion rubber material to the silicone light strip outlet by silicone co-extrusion, so as to realize that the light-blocking rubber material and the diffusion rubber material are formed on the circuit board to obtain the silicone light strip;

[0007] The silicone light strip extruded by the mold is heated and shaped to obtain an LED light strip, wherein the mold has a light-blocking rubber channel, a diffusion rubber channel, a circuit board channel and a silicone light strip outlet, and the light-blocking rubber channel, the diffusion rubber channel, the circuit board channel are connected to the silicone light strip outlet.

[0008] Preferably, obtaining the long strip rubber material comprises: fully mixing the vulcanizing agent with the silica gel raw material to obtain refined rubber; and cutting the refined rubber into long strips to form the long strip rubber material.

[0009] Preferably, the silicone light strip extruded from the mold is heated and shaped to obtain an LED light strip, comprising:

[0010] The silicone light strip is input into the tunnel furnace for heating to achieve vulcanization and shaping to obtain the LED light strip.

[0011] Preferably, while feeding the light-blocking adhesive, diffusion adhesive and circuit board with lamp beads into the light-blocking adhesive channel, diffusion adhesive channel and circuit board channel in the mold respectively, it also includes: feeding transparent cutting line adhesive into the cutting line adhesive channel in the mold, so that the transparent cutting line adhesive is formed at the bottom of the circuit board to facilitate seeing the cutting line at the bottom of the circuit board.

[0012] In the second aspect, the present disclosure provides a silicone co-extrusion mold for an LED light strip, comprising a co-extrusion part and a circuit board feeding part, wherein the co-extrusion part is provided with a light-blocking rubber channel, a diffusion rubber channel and a silicone light strip outlet; the light-blocking rubber channel and the diffusion rubber channel are arranged on the mounting surface of the co-extrusion part, and the silicone light strip outlet is arranged on the output surface of the co-extrusion part; the circuit board feeding part is vertically connected to the mounting surface of the co-extrusion part, and the circuit board feeding part and the co-extrusion part are provided with a circuit board channel, the circuit board channel is perpendicular to the mounting surface and passes through the circuit board feeding part and the co-extrusion part; the light-blocking rubber channel, the diffusion rubber channel and the circuit board channel are all in the installation position before reaching the silicone light strip outlet, and the light-blocking rubber, the diffusion rubber and the circuit board are respectively co-extruded at the silicone light strip outlet to form a silicone light strip.

[0013] Preferably, the circuit board feeding portion also has an air inlet hole connected to the silicone light strip outlet.

[0014] Preferably, an end of the circuit board feeding portion away from the co-extrusion portion is provided with an external thread.

[0015] Preferably, an insertion structure is provided at one end of the circuit board feeding portion close to the co-extrusion portion, which is inserted into the co-extrusion portion and reaches the outlet of the silicone light strip;

[0016] And / or, the mounting surface of the co-extrusion portion is also provided with threaded holes penetrating through the output surface for fixing the co-extrusion portion;

[0017] And / or, a cutting line glue inlet is further provided on the installation surface of the co-extrusion portion, and the cutting line glue inlet is connected to the installation position to achieve installation on the bottom of the circuit board during co-extrusion.

[0018] Preferably, the light-blocking rubber channel is distributed on both sides of the circuit board channel, and the diffusion rubber channel is distributed above the circuit board channel, and the light-blocking rubber channel is respectively located on both sides of the circuit board channel when reaching the installation position, so that the light-blocking rubber in the light-blocking rubber channel can block the light when the lamp beads are emitting light, and the diffusion rubber channel is located above the circuit board channel, wherein the top of the circuit board channel is above the position of the lamp beads of the circuit board, so that the diffusion rubber in the diffusion rubber channel can scatter the light when the lamp beads are emitting light.

[0019] In a third aspect, the present disclosure provides an LED light strip, comprising: being prepared by the above-mentioned LED light strip silicone co-extrusion method; or being prepared by the above-mentioned LED light strip silicone co-extrusion mold.

[0020] Compared with the prior art, the present disclosure has at least the following beneficial effects:

[0021] 1) The light-blocking rubber and the diffusion rubber fed are formed on the circuit board by means of silicone co-extrusion to obtain silicone light strips, and the silicone light strips extruded by the mold are heated and formed to obtain LED light strips, which can reduce the time for curing the colloid and improve the uniformity of the light emission of the LED light strips;

[0022] 2) Due to the use of silicone co-extrusion, the length of the LED light strip has also been greatly improved;

[0023] 3) The mold in the embodiment of the present disclosure has a vertically arranged co-extrusion part and a circuit board feeding part, which can ensure the stability of the circuit board feeding, and can make the silicone rubber stably formed on the circuit board during the silicone rubber co-extrusion process;

[0024] 4) The air inlet holes on the circuit board feed part can prevent inflation during the co-extrusion process to avoid the collapse of possible hollow positions in the silicone light strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0026] Figure 1 is a flow chart of the LED light strip silicone co-extrusion method in the embodiment of the present disclosure;

[0027] Figure 2 It is a schematic diagram of the output surface structure of the silicone co-extrusion mold for LED light strips in the embodiment of the present disclosure;

[0028] Figure 3 This is a schematic diagram of the mounting surface structure of the silicone co-extrusion mold for the LED light strip in the embodiment of the present disclosure;

[0029] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the silicone co-extrusion mold for the LED light strip in the embodiment of the present disclosure;

[0030] Figure 5 It is a schematic diagram of a second cross-sectional structure of the LED light strip silicone co-extrusion die in the embodiment of the present disclosure, regarding the connection of the cutting line rubber inlet;

[0031] Figure 6It is a third cross-sectional structural schematic diagram of the LED light strip silicone co-extrusion mold in the embodiment of the present disclosure regarding the light-blocking rubber channel and the diffusion rubber channel. DETAILED DESCRIPTION

[0032] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts that are not described in detail, those skilled in the art can also fully understand the present disclosure.

[0033] In addition, those skilled in the art should understand that the drawings are only provided to illustrate the purpose, features and advantages of the present disclosure, and the drawings are not actually drawn to scale.

[0034] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0035] like Figure 1 As shown, the embodiment of the present disclosure provides a method for co-extruding silicone rubber of an LED light strip, comprising the following steps:

[0036] S1, obtaining a long strip of adhesive material, wherein the long strip of adhesive material includes a light-blocking adhesive material and a diffusion adhesive material;

[0037] S2, feeding the light-blocking rubber material, the diffusion rubber material and the circuit board with lamp beads into the light-blocking rubber material channel 101, the diffusion rubber material channel 102 and the circuit board channel 201 in the mold respectively, and extruding the fed light-blocking rubber material and the diffusion rubber material to the silicone light strip outlet 103 by silicone co-extrusion, so as to form the light-blocking rubber material and the diffusion rubber material on the circuit board to obtain the silicone light strip;

[0038] S3. Heat and shape the silicone light strip extruded by the mold to obtain an LED light strip, wherein the mold has a light-blocking rubber channel 101, a diffusion rubber channel 102, a circuit board channel 201 and a silicone light strip outlet 103, and the light-blocking rubber channel 101, the diffusion rubber channel 102, the circuit board channel 201 are connected to the silicone light strip outlet 103.

[0039] The light-blocking rubber in S1 can be made of opaque silicone material, for example, materials with fire-resistant properties of UL94V0, V1, V2 or UL94HB, and hardness of Shore A30-90 to meet different mechanical strength and deformation requirements; the flame retardant properties can be defined as follows: for samples with a thickness of 3 to 13 mm, the burning speed is less than 40 mm per minute; for samples with a thickness of less than 3 mm, the burning speed is less than 70 mm per minute. This makes the light-blocking rubber have better weather resistance and safety protection properties.

[0040] The diffusion glue in S1 is a light-transmitting silicone material, for example, transparent silicone or colored translucent silicone with a refractive index of 83-98% can be selected to achieve better light output.

[0041] As one of the embodiments, obtaining the long strip rubber material includes: fully mixing the vulcanizing agent with the silica gel raw material to obtain the refined rubber; cutting the refined rubber into long strips to form the long strip rubber material;

[0042] Preferably, the diffusion rubber material is obtained by mixing transparent silicone and colored additives to achieve different color combinations. Different color combinations can be achieved in combination with the color of the light-blocking silicone material, for example, a combination of white opaque light-blocking silicone material and transparent diffusion silicone rubber, a combination of white opaque light-blocking silicone material and milky white translucent diffusion silicone rubber, a combination of black opaque light-blocking silicone material, milky white silicone rubber and gray translucent diffusion silicone rubber, a combination of brown opaque light-blocking silicone material and brown translucent diffusion silicone rubber, etc., to present a variety of LED light strip combinations, which can be integrated with the corresponding space in applications such as homes, furniture, and props.

[0043] As an optional implementation manner, the step of heating and shaping the silicone light strip extruded from the mold to obtain the LED light strip in S3 includes:

[0044] The silicone light strip is input into the tunnel furnace for heating to achieve vulcanization and shaping to obtain an LED light strip. The length and temperature of the tunnel furnace can be adjusted according to the actual situation. For example, a 20-meter length and a heating temperature of 170 degrees Celsius can be used to achieve better vulcanization and shaping, which can reduce the time for curing the colloid, and the LED light strip has good light uniformity, good heat resistance and cold resistance. The silicone in the LED light strip can be used in an environment with a temperature range of -50℃ to 250℃.

[0045] As an optional implementation, while feeding the light-blocking adhesive, diffusion adhesive and circuit board with lamp beads into the light-blocking adhesive channel 101, diffusion adhesive channel 102 and circuit board channel 201 in the mold respectively, in order to facilitate the cutting of the LED light strip, the cutting line at the bottom of the circuit board needs to be exposed, so it can be achieved in the following way: feed transparent cutting line adhesive (such as transparent latex) into the cutting line adhesive channel 108 in the mold, so that the transparent cutting line adhesive is formed at the bottom of the circuit board to facilitate the viewing of the cutting line at the bottom of the circuit board. In the subsequent steps, the LED light strip can be cut to the length required by the customer.

[0046] As an optional implementation, the light-blocking rubber and diffusion rubber fed into S2 are extruded to the silicone light strip outlet 103 by silicone co-extrusion, wherein the silicone light strip outlet 103 has been able to enter the installation position before, and the silicone light strip outlet 103 is extruded together with the input circuit board under the extrusion of co-extrusion in the installation position to form a silicone light strip. Since the silicone light strips are all made of full silicone wire, they are softer, more corrosion-resistant, and UV-resistant compared to other materials, and can reach the IP68 waterproof level, and can be used in swimming pools and other usage scenarios.

[0047] As another aspect of the embodiments of the present disclosure, a silicone co-extrusion mold for an LED light strip is also provided. Figure 2 and Figure 3 As shown, it includes a co-extrusion part 10 and a circuit board feeding part 20, and the co-extrusion part 10 is provided with a light-blocking glue channel 101, a diffusion glue channel 102 and a silicone light strip outlet 103; the light-blocking glue channel 101 and the diffusion glue channel 102 are arranged on the mounting surface 105 of the co-extrusion part 10, and the silicone light strip outlet 103 is arranged on the output surface 104 of the co-extrusion part 10; the circuit board feeding part 20 is vertically connected to the mounting surface 105 of the co-extrusion part 10, and ... A circuit board channel 201 is provided inside the part 20 and the co-extrusion part 10, and the circuit board channel 201 is perpendicular to the installation surface 105 and passes through the circuit board feeding part 20 and the co-extrusion part 10; the light-blocking rubber channel 101, the diffusion rubber channel 102, and the circuit board channel 201 all arrive at the same installation position before reaching the silicone light strip outlet 103, and the light-blocking rubber, the diffusion rubber, and the circuit board are co-extruded at the silicone light strip outlet 103 to form a silicone light strip.

[0048] The mold in the disclosed embodiment adopts the method of silicone co-extrusion, so the length of the LED light strip obtained is greatly improved, the light uniformity of the LED light strip is better, the thickness of the LED light strip obtained by the above method can reach 1.5±0.3mm, and the light transmittance can reach 90%. The mold has a vertically arranged co-extrusion part 10 and a circuit board feeding part 20, which can ensure the stability of the circuit board feeding, and can make the silicone stably formed on the circuit board during the silicone co-extrusion process.

[0049] As a preferred embodiment, the circuit board feed part 20 also has an air inlet hole 203 connected to the silicone light strip outlet 103. The setting of the air inlet hole 203 can prevent inflation during the co-extrusion process to avoid the possible collapse of the hollow position in the silicone light strip, wherein the air inlet hole 203 can be together with the circuit board channel 201, or can be set separately.

[0050] As a preferred embodiment, the circuit board feeding portion 20 is provided with an external thread 202 at one end away from the co-extrusion portion 10, and the external thread 202 can be used to connect a machine head for feeding rubber (not shown in the figure), and the other end of the machine head is connected to a rubber mixing equipment (not shown in the figure), wherein the light-blocking rubber and the diffusion rubber can both be obtained by the rubber mixing equipment.

[0051] As a preferred embodiment, an insertion structure 204 is provided at one end of the circuit board feeding portion 20 close to the co-extrusion portion 10, which is inserted into the co-extrusion portion 10 and reaches the silicone light strip outlet 103;

[0052] As a preferred embodiment, threaded holes 106 penetrating the output surface 104 for fixing the coextrusion part 10 are distributed on the installation surface 105 of the coextrusion part 10, so as to facilitate the installation of the coextrusion part 10 on the production line frame or at the entrance of the tunnel furnace.

[0053] As a preferred embodiment, Figure 5 As shown, it is a second cross-sectional structural diagram regarding the connection of the cutting line glue inlet 107 in the embodiment of the present disclosure. The second cross-sectional structural diagram is a cross-sectional diagram of the extrusion portion in the plane where the cutting line glue channel 108 is located, so the cutting line glue channel 108 can be seen. A cutting line glue inlet 107 is also provided on the mounting surface 105 of the co-extrusion portion 10. The cutting line glue inlet 107 is connected to the mounting position to achieve installation at the bottom of the circuit board during co-extrusion. The transparent cutting line glue can enter the mounting position through the cutting line glue inlet 107 and then be installed at the bottom of the circuit board. The cutting line at the bottom of the circuit board can be seen through the transparent cutting line glue to facilitate the subsequent cutting of the light strip. Figure 4The arrows shown indicate the path of the cutting line glue channel 108. After the transparent cutting line glue enters from the cutting line glue inlet 107 and rises to a certain height, it rises through an inclined plane and passes to the bottom surface of the circuit board channel 201 to facilitate mounting on the bottom surface of the circuit board.

[0054] As a preferred embodiment, Figure 6 As shown, it is a third cross-sectional structural schematic diagram of the light-blocking rubber material channel 101 and the diffusion rubber material channel 102 in the embodiment of the present disclosure, and the third cross-sectional structural schematic diagram is a cross-sectional view of the extrusion portion of the plane where the light-blocking rubber material channel 101 and the diffusion rubber material channel 102 are located. Among them, the light-blocking rubber material channel 101 is distributed on both sides of the circuit board channel 201, and when the light-blocking rubber material channel 101 reaches the installation position, it is respectively located on both sides of the circuit board channel 201, so that the light-blocking rubber material in the light-blocking rubber material channel 101 can block the light when the lamp beads are emitting light, and the diffusion rubber material channel 102 is located above the circuit board channel 201, wherein the upper part of the circuit board channel 201 is above the position where the lamp beads of the circuit board are located, so that the diffusion rubber material in the diffusion rubber material channel 102 can scatter and propagate the light when the lamp beads are emitting light.

[0055] As a preferred embodiment, Figure 6 As shown by the middle arrow, the light-blocking glue channel 101 transmits the light-blocking glue and eventually leads to the lower side or both sides of the circuit board channel 201, while the diffusion glue channel 102 transmits the diffusion glue and eventually leads to the upper side of the circuit board channel 201 to realize the extrusion packaging of the circuit board.

[0056] As another aspect of the embodiments of the present disclosure, the embodiments of the present disclosure also provide an LED light strip, including: prepared using the LED light strip silicone co-extrusion mold as in the above embodiments, or prepared using the LED light strip silicone co-extrusion method in the above embodiments.

[0057] The above-described embodiments are only embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present disclosure. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present disclosure, several variations, equivalent substitutions, improvements, etc. may be made, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the attached claims.

Claims

1. A method for co-extruding silicone rubber with LED lights, characterized in that: The steps include: Obtaining a long strip of adhesive material, wherein the long strip of adhesive material includes a light-blocking adhesive material and a diffusion adhesive material; Feeding the light-blocking rubber material, the diffusion rubber material and the circuit board with lamp beads into the light-blocking rubber material channel, the diffusion rubber material channel and the circuit board channel in the mold respectively, and extruding the fed light-blocking rubber material and the diffusion rubber material to the silicone light strip outlet by silicone co-extrusion, so as to realize that the light-blocking rubber material and the diffusion rubber material are formed on the circuit board to obtain the silicone light strip; The silicone light strip extruded by the mold is heated and shaped to obtain an LED light strip, wherein the mold has a light-blocking rubber channel, a diffusion rubber channel, a circuit board channel and a silicone light strip outlet, and the light-blocking rubber channel, the diffusion rubber channel, the circuit board channel are connected to the silicone light strip outlet.

2. The LED light strip silicone co-extrusion method according to claim 1, characterized in that: The method for obtaining the long strip rubber material comprises: fully mixing the vulcanizing agent with the silica gel raw material to obtain the refined rubber; and cutting the refined rubber into long strips to form the long strip rubber material.

3. The LED light strip silicone co-extrusion method according to any one of claims 1-2, characterized in that: The silicone light strip extruded from the mold is heated and shaped to obtain an LED light strip, including: The silicone light strip is input into the tunnel furnace for heating to achieve vulcanization and shaping to obtain the LED light strip.

4. The LED light strip silicone co-extrusion method according to any one of claims 1-2, characterized in that: The light-blocking glue, diffusion glue and circuit board with lamp beads are respectively fed into the light-blocking glue channel, diffusion glue channel and circuit board channel in the mold, and the method also includes: feeding transparent cutting line glue into the cutting line glue channel in the mold, so that the transparent cutting line glue is formed at the bottom of the circuit board to facilitate seeing the cutting line at the bottom of the circuit board.

5. A silicone co-extrusion mold for LED light strips, characterized in that: It includes a co-extrusion part and a circuit board feeding part, and the co-extrusion part is provided with a light-blocking rubber channel, a diffusion rubber channel and a silicone light strip outlet; the light-blocking rubber channel and the diffusion rubber channel are arranged on the installation surface of the co-extrusion part, and the silicone light strip outlet is arranged on the output surface of the co-extrusion part; the circuit board feeding part is vertically connected to the installation surface of the co-extrusion part, and the circuit board feeding part and the co-extrusion part are provided with a circuit board channel, and the circuit board channel is perpendicular to the installation surface and passes through the circuit board feeding part and the co-extrusion part; the light-blocking rubber channel, the diffusion rubber channel and the circuit board channel are all in the installation position before reaching the silicone light strip outlet, and the light-blocking rubber, the diffusion rubber and the circuit board are respectively co-extruded at the silicone light strip outlet to form a silicone light strip.

6. The LED light strip silicone co-extrusion mold according to claim 5, characterized in that: The circuit board feeding part also has an air inlet hole connected with the silica gel light strip outlet.

7. The LED light strip silicone co-extrusion mold according to claim 5, characterized in that: An end of the circuit board feeding portion away from the co-extrusion portion is provided with an external thread.

8. The LED light strip silicone co-extrusion mold according to claim 5 or 6, characterized in that: An insertion structure is provided at one end of the circuit board feeding portion close to the co-extrusion portion, which is inserted into the co-extrusion portion and reaches the outlet of the silicone light strip; And / or, the mounting surface of the co-extrusion portion is also provided with threaded holes penetrating through the output surface for fixing the co-extrusion portion; And / or, a cutting line glue inlet is further provided on the installation surface of the co-extrusion portion, and the cutting line glue inlet is connected to the installation position to achieve installation on the bottom of the circuit board during co-extrusion.

9. The LED light strip silicone co-extrusion mold according to any one of claims 5 to 7, characterized in that: The light-blocking rubber channel is distributed on both sides of the circuit board channel, and the diffusion rubber channel is distributed above the circuit board channel. When the light-blocking rubber channel reaches the installation position, they are respectively located on both sides of the circuit board channel, so that the light-blocking rubber in the light-blocking rubber channel can block light when the lamp beads are emitting light. The diffusion rubber channel is located above the circuit board channel, wherein the top of the circuit board channel is above the position of the lamp beads of the circuit board, so that the diffusion rubber in the diffusion rubber channel can scatter light when the lamp beads are emitting light.

10. An LED light strip, characterized in that: The LED light strip is prepared by the LED light strip silicone co-extrusion method as described in any one of claims 1-4; or, the LED light strip is prepared by the LED light strip silicone co-extrusion mold as described in any one of claims 5-9.

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