A copper foil peeling strength testing device and testing method for copper clad laminates

Abstract

A copper foil peel strength test device and method for copper clad laminates (CCLs) belongs to the technical field of CCL testing. The CCL copper foil peel strength test device comprises: a horizontally arranged track with a limiter disposed above the track; a pushing assembly disposed at the front end of the track; a slotting assembly disposed above the track; a traction assembly disposed at the rear end of the track, the traction assembly comprising a connecting rod movable in a vertical direction, a dynamometer disposed at the upper end of the connecting rod, and a mounting bracket disposed on top of the dynamometer; a clamping assembly comprising a rectangular tube with a latch vertically extending through the top plate of the tube, a spring disposed at the top of the latch, the tube being rotatably mounted on the mounting bracket via a side connecting shaft, and a sensor disposed on the rectangular tube for detecting the position of the latch. This solution has a higher degree of automation, helps improve testing efficiency, and can effectively prevent copper foil breakage caused by excessive clamping force.

Description

Technical Field

[0001] The invention belongs to the technical field of copper clad laminate testing, and in particular relates to a copper clad laminate copper foil peeling strength testing device and a testing method. Background Art

[0002] Copper-clad laminates (CCLs) are typically made by bonding copper foil to a substrate using prepreg. They are primarily used in the production of printed circuit boards (PCBs). During the production process, the peel strength of the copper foil must be tested, as this strength directly impacts the quality and lifespan of the PCB.

[0003] The existing testing device mainly includes the following steps when testing the peel strength of copper foil:

[0004] To make the sample, the operator needs to use a blade to peel off a section of the copper foil at one end of the copper clad laminate sample to facilitate the fixture to clamp the copper foil;

[0005] Fix the sample by using double-sided tape or adhesive to stick the copper clad laminate to the fixed table on the test device, with the copper foil facing up. This process is also done manually. The copper clad laminate sample fixed in this way is generally not stable. There is a risk of sample displacement and falling off during the test. In addition, the residual glue on the table needs to be cleaned after each test, which increases the auxiliary workload of the test.

[0006] To clamp the copper foil, the operator manually inserts the pre-peeled copper foil from the sample end into the fixture and clamps it. Most existing fixtures use two clamping surfaces to directly press the two sides of the copper foil. This clamping method requires sufficient pressure on the copper foil to ensure clamping stability. Furthermore, the fixture usually makes rigid contact with the copper foil. Excessive clamping force can easily cause the copper foil to become thinner, leading to breakage at the edge of the fixture during testing. Reducing the clamping force can easily cause the copper foil to slip off the fixture.

[0007] In the above process, there is a lot of manual participation and auxiliary operations, and the degree of automation of the test device is low, which has a certain impact on the test efficiency. In addition, there is a risk of the copper foil breaking or slipping during the test. Summary of the Invention

[0008] To address the deficiencies in the prior art, the present invention provides a copper foil peel strength testing device and method for copper clad laminates, which have a higher degree of automation, help improve test efficiency, and can effectively prevent copper foil breakage caused by excessive clamping force.

[0009] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0010] A copper foil peeling strength testing device for a copper clad laminate, comprising:

[0011] The horizontal track is used to place the sample board, with the copper foil facing down and the substrate facing up. A limit piece is provided above the track corresponding to the sample board.

[0012] The pushing component is located at the front end of the track and is used to push the template toward the rear end of the track;

[0013] The cutting assembly is provided above the track and is used to cut the substrate into two sections, a front section and a rear section, with a cutting groove perpendicular to the line connecting the front and rear ends of the track formed between the two sections;

[0014] The traction assembly is arranged at the rear end of the track. The traction assembly includes a connecting rod that is movable in the vertical direction. The upper end of the connecting rod is provided with a tensile gauge, and the top of the tensile gauge is provided with a mounting bracket;

[0015] The clamping assembly includes a rectangular tube, the width of whose inner hole is greater than the width of the template, the height of the inner hole is greater than the thickness of the template, the width direction of the rectangular tube is consistent with the width direction of the track, and a pin is vertically passed through the top plate of the rectangular tube. The lower end of the pin is located in the inner hole of the rectangular tube, and the side of the lower end of the pin facing the front end of the rectangular tube is an inclined surface. A spring is provided on the top of the pin for applying downward pressure to the pin. A connecting shaft parallel to the width direction of the track is provided on the side of the rectangular tube, and the connecting shaft is rotatably connected to the mounting bracket. A sensor for detecting the position of the pin is provided on the rectangular tube.

[0016] The copper foil peel strength test method of the copper clad laminate is implemented using the copper foil peel strength test device of the copper clad laminate, and the test method comprises the following steps:

[0017] Step 1: Place the copper clad laminate sample of predetermined width on the track, rotate the rectangular tube around the connecting axis so that the front end of the rectangular tube faces the track, and adjust the height of the connecting rod so that the inner hole of the rectangular tube is aligned with the sample;

[0018] Step 2: Use the pushing component to push the template toward the rear end of the track so that the rear end of the template is inserted into the rectangular tube. The upper edge of the rear end of the template contacts the inclined surface of the lower end of the latch, which then pushes the latch upward until the lower end of the latch is pressed against the top surface of the template. The pushing component stops pushing, and the sensor detects the upper end position of the latch, and the sensor signal is turned on.

[0019] Step 3: The cutting assembly cuts the substrate of the sample into a front-end substrate and a rear-end substrate, and a cutting groove is formed at the cutting position of the substrate;

[0020] Step 4: After the substrate is cut, use the pushing assembly to continue pushing the sample backward. When the cutting groove moves below the latch, the latch will drop and insert into the cutting groove. The upper end of the latch moves out of the sensing range of the sensor, the sensor signal is disconnected, and the pushing assembly stops pushing.

[0021] Step 5: Flip the rectangular tube around the connecting axis, swing the rear end of the rectangular tube downward 90 degrees, so that the rectangular tube is in a vertical state, and press the latch toward the side of the rear end of the rectangular tube against the front end surface of the rear section base plate;

[0022] Step 6: Move the connecting rod downward and use the rectangular tube clamping assembly to pull the rear substrate downward. During the downward movement of the rear substrate, the copper foil on the bottom surface of the front substrate will be separated from the front substrate. The data of the tensile gauge during the descent of the connecting rod is collected as a reference for the peel strength of the copper foil.

[0023] The beneficial effects of the present invention are as follows: the substrate is separated into two sections, front and back, by cutting, and the copper foil at the rear end of the substrate is separated from the substrate by using a clamping assembly during the flipping process, and the operator does not need to use a blade to manually separate the copper foil for connecting the clamp; this solution uses the clamping assembly to clamp the rear section of the substrate while separating the copper foil in the initial stage, thereby achieving a fixed connection between the end of the copper foil and the clamping assembly, so that the copper foil can be pulled during the peeling process without directly clamping the copper foil, thereby avoiding the breakage of the copper foil due to excessive clamping force, and preventing the copper foil from slipping due to insufficient clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0025] Figure 1 It shows a schematic diagram of the overall structure of the present application when the rectangular tube is in a horizontal state.

[0026] Figure 2 Shown Figure 1 A partial enlarged view of point A in the middle.

[0027] Figure 3 A partial cross-sectional view of the present application is shown when the substrate is cut.

[0028] Figure 4 Shown Figure 3 A partial enlarged view of point B in the middle.

[0029] Figure 5 A partial cross-sectional view of the present application is shown when the pin is inserted into the cutting groove.

[0030] Figure 6 Shown Figure 5 A partial enlarged view of point C in the middle.

[0031] Figure 7 A schematic diagram of a partial structure of a preferred embodiment of the present application is shown.

[0032] Figure 8 Shown Figure 7 A partial enlarged view of point D in the middle.

[0033] Figure 9 A partial cross-sectional view of the present application is shown when the rectangular tube is in a vertical state.

[0034] Figure 10 Shown Figure 9 A partial enlarged view of point E in the middle.

[0035] Figure 11 A partial schematic diagram is shown when the arc-shaped teeth are separated from the rack.

[0036] Figure 12 A partial cross-sectional view of the present application is shown when the copper foil is peeled off.

[0037] Figure 13 A schematic structural diagram of the clamping assembly and the traction assembly is shown.

[0038] Markings in the figure: track-1, limiter-11, extension section-12, guide rail-13, rack-131, pushing assembly-2, telescopic cylinder-21, push plate-22, grooving assembly-3, drive motor-31, cylindrical milling cutter-32, slide rail-33, telescopic device-34, traction assembly-4, connecting rod-41, dynamometer-42, mounting bracket-43, clamping assembly-5, rectangular tube-51, connecting shaft-511, pin-52, spring-53, sensor-54, gantry-55, rectangular block-56, first side surface-561, second side surface-562, arc-shaped tooth-563. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] Example 1, as Figures 1 to 13 As shown, a copper foil peeling strength testing device for a copper clad laminate comprises: a track 1, a pushing assembly 2, a grooving assembly 3, a pulling assembly 4 and a clamping assembly 5.

[0041] The track 1 is arranged horizontally and is used to place the sample of the copper clad laminate to be tested. When placed, the copper foil of the copper clad laminate faces downward and the substrate faces upward. A limiter 11 is provided above the track 1 corresponding to the sample to prevent the sample from moving upward or warping. As a preferred structure, the limiter 11 is a roller structure. When the rear end of the sample box track 1 moves, the limiter 11 rolls in contact with the top surface of the sample to reduce friction; the structure of the track 1 used to support the sample is a smooth plane structure, or a row of cylindrical rollers is provided along the length direction of the track 1 to support and transport the sample to reduce the friction between the sample and the track 1.

[0042] The pushing component 2 is arranged at the front end of the track 1, and is used to push the template toward the rear end of the track 1; specifically, the pushing component 2 includes a telescopic cylinder 21 arranged at the front end of the track 1, and a push plate 22 is provided at the end of the telescopic rod of the telescopic cylinder 21, which is used to push the template to move; the telescopic cylinder 21 can also be replaced by a linear motor.

[0043] The cutting assembly 3 is arranged above the track 1 and is used to cut the substrate into two sections, the front and rear sections. The cutting groove between the front and rear sections of the substrate is perpendicular to the line connecting the front and rear ends of the track 1.

[0044] The traction assembly 4 is arranged at the rear end of the track 1. The traction assembly 4 includes a connecting rod 41 that is movable in the vertical direction. A dynamometer 42 is provided at the upper end of the connecting rod 41. A mounting bracket 43 is provided on the top of the dynamometer 42. The dynamometer 42 is a flange-type push-pull dynamometer so that the mounting bracket 43 can be stably connected to the connecting rod 41 so that the mounting bracket 43 moves up and down with the connecting rod 41. In a specific embodiment, the traction assembly 4 also includes a traction device for driving the connecting rod 41 to move. The traction device is a cylinder or a hydraulic cylinder.

[0045] The clamping assembly 5 includes a rectangular tube 51, the width of whose inner hole is greater than the width of the template, and the height of the inner hole is greater than the thickness of the template. The width direction of the rectangular tube 51 is consistent with the width direction of the track 1. A pin 52 is vertically passed through the top plate of the rectangular tube 51, and the lower end of the pin 52 is located in the inner hole of the rectangular tube 51, and the side of the lower end of the pin 52 facing the front end of the rectangular tube 51 is an inclined surface, and a spring 53 is provided on the top of the pin 52 for applying downward pressure to the pin 52. A connecting shaft 511 parallel to the width direction of the track 1 is provided on the side of the rectangular tube 51, and the connecting shaft 511 is rotatably connected to the mounting bracket 43. Specifically, the mounting bracket 43 is designed as a U-shaped structure. Connecting shafts 511 are coaxially provided on both sides of the rectangular tube 51, and the connecting shafts 511 on both sides are rotatably connected to the two side walls of the U-shaped structure of the mounting bracket 43, so as to ensure the stability of the installation of the rectangular tube 51. A sensor 54 for detecting the position of the pin 52 is provided on the rectangular tube 51.

[0046] Example 2, a method for testing the peel strength of copper foil of a copper clad laminate, is implemented using the above-mentioned copper foil peel strength testing device for copper clad laminates, and the testing method comprises the following steps:

[0047] Step 1: Place the template and adjust the rectangular tube 51. The specific steps include: placing a copper-clad laminate template of a predetermined width on the track 1, rotating the rectangular tube 51 around the connecting shaft 511 so that the front end of the rectangular tube 51 faces the track 1, and adjusting the height of the connecting rod 41 so that the inner hole of the rectangular tube 51 is aligned with the template.

[0048] Step 2: Use the pushing assembly 2 to push the template toward the rear end of the track 1 so that the rear end of the template is inserted into the rectangular tube 51. The upper edge of the rear end of the template slides along the inclined surface of the lower end of the latch 52 to push the latch 52 upward. When the lower end of the latch 52 is pressed against the top surface of the template, the pushing assembly 2 stops pushing. At this time, the sensor 54 detects the upper end position of the latch 52, and the sensor 54 signal is turned on.

[0049] Step 3: The cutting assembly 3 cuts the substrate of the template into a front substrate and a rear substrate, wherein the front substrate refers to the substrate located at one end of the track 1, and the rear substrate refers to the substrate located at one end of the rectangular tube 51. A cutting groove is formed at the cutting position of the substrate, and the cutting tool is separated from the template after cutting. In a specific embodiment, the substrate is cut using a cylindrical milling cutter 32, and after cutting, the cylindrical milling cutter 32 is moved to the outside of the template;

[0050] Step 4: After the substrate is cut, the pushing component 2 is used to continue to push the template backward. When the cutting groove moves to the bottom of the latch 52, the latch 52 will drop and insert into the cutting groove. After the latch 52 drops, the upper part of the latch 52 moves out of the sensing range of the sensor 54. The signal of the sensor 54 is disconnected, and the pushing component 2 stops pushing. This solution uses the work completion signal of the grooving component 3 or the reset signal of the grooving tool as the judgment basis for restarting the pushing component 2, and uses the connection and disconnection of the sensor 54 signal as the judgment basis for stopping the pushing component 2.

[0051] Step 5: The rectangular tube 51 is flipped around the connecting shaft 511, and the rear end of the rectangular tube 51 is swung downward 90°, so that the rectangular tube 51 is in a vertical position. The latch 52 is pressed against the front end surface of the rear base plate toward the rear end of the rectangular tube 51. The front end surface here specifically refers to the end surface of the rear base plate toward the end of the track 1.

[0052] Step 6: Move the connecting rod 41 downward, and use the clamping assembly 5 to pull the rear substrate downward. During the downward movement of the rear substrate, the copper foil on the bottom surface of the front substrate will be separated from the front substrate, and the front substrate will automatically move to the rear end of the track 1. Collect the data of the dynamometer 42 during the descent of the connecting rod 41 as a reference for the peeling strength of the copper foil. During the peeling process, the clamping assembly 5 uses the latch 52 to clamp the front end of the rear substrate to fix the rear end of the copper foil, avoiding direct compression and clamping of the copper foil. This can effectively prevent the copper foil from becoming thinner due to extrusion and then being pulled apart. In addition, there is sufficient bonding area between the rear substrate and the corresponding copper foil, and the force direction is parallel to the copper foil, so that the rear substrate and the copper foil have sufficient connection strength, which can effectively prevent the rear substrate from separating from the corresponding copper foil when peeling the copper foil of the front substrate.

[0053] Preferably, Figure 1 、 Figure 12 As shown, an extension section 12 of the track 1 is provided at the rear of the track 1, and the clamping assembly 5 is located between the track 1 and the extension section 12. The extension section 12 is used to support the rear end of the front substrate after the copper foil is peeled off, thereby reducing the deformation of the end of the substrate during the test, thereby reducing the error of the test result.

[0054] Preferably, Figure 1 、 Figure 3 、 Figure 4 and Figure 7 As shown, the grooving assembly 3 includes a drive motor 31 disposed above the track 1 and movable along the width direction of the track 1. The main shaft of the drive motor 31 is coaxially provided with a cylindrical milling cutter 32. The cylindrical milling cutter 32 faces vertically downward, and the height of its lower end is in the same plane as the bottom surface of the substrate. In actual application, the drive motor 31 can be driven to move back and forth along the width direction of the track 1 by a cylinder or a screw motor. During the movement, the drive motor 31 drives the cylindrical milling cutter 32 to rotate, thereby using the cylindrical milling cutter 32 to cut the template from one side to the other in the width direction of the template until the template is cut into a front and rear section structure, and the copper foil remains intact. The width of the cutting groove is controlled by the outer diameter of the cylindrical milling cutter 32. As a preferred solution, the outer diameter of the cylindrical milling cutter 32 is greater than or equal to 2 mm, thereby ensuring that the width of the cutting groove is greater than or equal to 2 mm, facilitating smooth insertion of the lower end of the latch 52. It is understood that a wider cutting groove facilitates insertion of the latch 52 and helps increase the rear end of the latch 52 to ensure sufficient bending strength. Therefore, the outer diameter of the cylindrical milling cutter 32 can also be selected to be 4 mm, 5 mm, 6 mm, or even larger. In actual manufacturing and installation, it is not possible to ensure that the height of the lower end of the cylindrical milling cutter 32 is absolutely level with the bottom surface of the substrate. Therefore, the thickness of the adhesive layer between the copper foil and the substrate can be used to provide a position fluctuation margin for the lower end of the cylindrical milling cutter 32 to ensure that the substrate is completely cut through without damaging the copper foil.

[0055] More preferably, Figure 1 、 Figure 7 As shown, a pair of parallel slide rails 33 are set up at the top of the track 1 along the width direction, and the drive motor 31 is slidably set on the slide rails 33. A telescopic device 34 is provided at one end of the slide rail 33. The movable rod of the telescopic device 34 is connected to the drive motor 31. The telescopic device 34 is used to control the drive motor 31 to move back and forth along the slide rail 33. The telescopic device 34 is a component composed of a cylinder, a linear motor or a motor screw. The provision of the slide rail 33 helps to improve the stability of the drive motor 31 during movement, thereby ensuring the constant height position of the lower end face of the cylindrical milling cutter 32, reducing the longitudinal runout of the cylindrical milling cutter 32, thereby improving the processing accuracy, preventing damage to the copper foil and avoiding local leakage of the substrate, and ensuring that the substrate is completely cut.

[0056] Preferably, Figure 4 、 Figure 6 、 Figure 9 As shown, the top surface of the front end of the bottom plate of the rectangular tube 51 is a chamfered structure, and the axis of the connecting shaft 511 coincides with the center of the chamfered structure. The latch 52 is located above the axis of the connecting shaft 511. This not only supports the bottom surface of the end of the template when the latch 52 presses the template, but also improves the stability of the template during the slitting process. Before the rectangular tube 51 is turned over, the latch 52 can also be used to position the cutting groove above the connecting shaft 511. When the rear end of the rectangular tube 51 rotates downward, the copper foil below the cutting groove can be pressed against the surface of the chamfered structure and rotated, so that the copper foil can achieve the purpose of arc bending. Moreover, the center of the chamfered structure coincides with the axis of the connecting shaft 511, which can effectively prevent the copper foil from breaking at the edge of the bottom plate of the rectangular tube 51. This structure also brings the center of rotation of the rectangular tube 51, i.e., the axis of the connecting shaft 511, closer to the end of the track 1, shortening the distance between the bottom plate of the rectangular tube 51 and the end of the track 1 after flipping, and making the angle between the peeled copper foil and the front substrate closer to 90 degrees, thereby obtaining more accurate test data.

[0057] Preferably, there is a predetermined spacing between the clamping assembly 5 and the rear end of the track 1 and the grooving assembly 3. The purpose of this structural design is not only to provide sufficient turning space for the clamping assembly 5, but also to space the cylindrical milling cutter 32 and the pin 52. This structure can ensure that the substrate at the rear end of the cutting groove has a sufficient length so that there is a sufficiently large contact surface between the rear-end substrate and the copper foil, thereby ensuring sufficient connection strength between the copper foil and the rear-end substrate, preventing the copper foil on the rear-end substrate from peeling off during the test; in the specific design, the distance between the cylindrical milling cutter 32 and the pin 52 can be greater than 20 mm.

[0058] Preferably, Figure 4 、 Figure 6 、 Figure 10 and Figure 13 As shown, multiple latches 52 are provided at intervals along the width direction of the rectangular tube 51, and a gantry 55 is provided above the top plate of the rectangular tube 51. The tops of the springs 53 are in contact with the bottom surface of the crossbeam of the gantry 55. The crossbeam of the gantry 55 can simultaneously limit the upper end positions of all springs 53, simplifying the limiting structure of the spring 53. Countersunk holes are provided on the tops of the latches 52 to accommodate the springs 53, so as to reduce the space size used after the springs 53 are compressed, thereby reducing the height of the gantry 55, thereby shortening the distance between the extension section 12 and the clamping assembly 5, so that the substrate after the copper foil is stripped can contact the extension section 12 as soon as possible. A convex edge is provided on the upper end of the latch 52, and the convex edge is located on the outside of the rectangular tube 51 to prevent the latch 52 from falling. The sensor 54 is provided on the side rod of the gantry 55.

[0059] Preferably, Figure 11 、 Figure 13 As shown, coaxially arranged connecting shafts 511 are provided on both sides of the rectangular tube 51, and the connecting shafts 511 are rotatably arranged on the mounting bracket 43. Rectangular blocks 56 are provided on the outer ends of the connecting shafts 511. The rectangular blocks 56 have a first side surface 561 and a second side surface 562 that are perpendicular to and adjacent to each other. The first side surface 561 is parallel to the front end surface of the rectangular tube 51, and the second side surface 562 is parallel to the bottom plate of the rectangular tube 51. An arc-shaped tooth 563 with a quarter arc length is provided at the intersection of the first side surface 561 and the second side surface 562. The axis of the arc-shaped tooth 563 is coaxial with the connecting shaft 511. A longitudinally arranged guide rail 13 is provided on both sides of the rear end of the track 1, and a protruding rack 131 is provided on the rear wall of the guide rail 13. The rear wall here refers to the side of the guide rail 13 facing the rear of the track 1, and the rack 131 is located in the middle section of the guide rail 13. The middle section here is not the midpoint position of the guide rail 13, but means that the body of the guide rail 13 is retained above and below the rack 131.

[0060] like Figure 1 、 Figure 2 As shown, when the first side surface 561 contacts the rear wall of the guide rail 13 above the rack 131, the arcuate tooth 563 engages with the rack 131 to prevent the rectangular block 56 from continuing to move upward relative to the guide rail 13. In a specific embodiment, the tooth groove of the arcuate tooth 563 close to the first side surface 561 engages with the uppermost tooth of the rack 131, and at this time the horizontal front end of the rectangular tube 51 faces the track 1, so that the inner hole of the rectangular tube 51 is aligned with the template on the track 1. This structure utilizes the coordination between the rack 131 and the arcuate tooth 563 to limit the upward movement of the rectangular block 56, and at the same time utilizes the contact between the first side surface 561 and the rear wall of the guide rail 13 to limit the rotation angle of the rectangular tube 51, so that the rectangular tube 51 is horizontal.

[0061] like Figure 7 、 Figure 8 and Figure 11As shown, when the second side surface 562 contacts the rear wall of the guide rail 13 below the rack 131, the arcuate tooth 563 separates from the rack 131, and the rectangular tube 51 is in a vertical position with the front end facing upward. Specifically, as a preferred structural design, in order to ensure that the arcuate tooth 563 is separated from the rack 131, the number of tooth grooves of the arcuate tooth 563 can be set to be greater than the number of teeth of the rack 131, for example, the number of tooth grooves of the arcuate tooth 563 is set to 5, and the number of teeth of the rack 131 is set to 4; wherein, the first tooth groove of the arcuate tooth 563 near the second side surface 562 does not mesh with the teeth of the rack 131. In this way, when the second side surface 562 contacts the rear wall of the guide rail 13, the distance between the second tooth of the arcuate tooth 563 near one end of the second side surface 562 and the rear wall of the guide rail 13 is greater than the tooth height of the rack 131, thereby achieving the purpose of separating the arcuate tooth 563 from the rack 131. After the arc-shaped teeth 563 separate from the rack 131, the clamping assembly 5 moves downward under the drive of the connecting rod 41, and the rectangular block 56 also slides downward along the guide rail 13. Because the second side surface 562 contacts the rear wall of the guide rail 13, it can prevent the rectangular tube 51 from rotating around the connecting axis 511. During the process of descending, the rectangular tube 51 will pull the copper foil and the substrate apart. Valid data of the test structure can be recorded starting from the time the second side surface 562 contacts the rear wall of the guide rail 13.

[0062] After the first side surface 561 contacts the rear wall of the guide rail 13 above the rack 131, the connecting rod 41 is moved downward, which can drive the rectangular tube 51 to descend together. During the descending process of the rectangular tube 51, the arc-shaped teeth 563 begin to roll on the rack 131, thereby causing the rear end of the rectangular tube 51 to flip downward around the connecting shaft 511 until the second side surface 562 contacts the rear wall of the guide rail 13. Because the first side surface 561 and the second side surface 562 are perpendicular to each other, when the rectangular tube 51 rotates from the state where the first side surface 561 contacts the rear wall of the guide rail 13 to the state where the second side surface 562 contacts the rear wall of the guide rail 13, the rectangular tube 51 just flips 90°; this scheme uses the traction component 4 to pull the copper foil downward to automatically flip the rectangular tube 51, reducing the driving components used to independently drive the rectangular tube 51 to rotate, making the structure of the device simpler and easier to arrange.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to be the only one or to limit the present invention. It should be understood by those skilled in the art that various changes or equivalent replacements made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A copper foil peeling strength testing device for copper clad laminates, characterized in that: include: A horizontally arranged track (1) is used to place the sample, with the copper foil facing downward and the substrate facing upward when placed, and a limiter (11) is provided above the track (1) corresponding to the sample; A pushing component (2) is provided at the front end of the track (1) and is used to push the sample toward the rear end of the track (1); A cutting groove assembly (3) is provided above the track (1) and is used to cut the substrate into two sections, a front section and a rear section, wherein a cutting groove perpendicular to the track (1) is formed between the front section and the rear section of the substrate; A traction assembly (4) is provided at the rear end of the track (1), the traction assembly (4) comprising a connecting rod (41) movable in a vertical direction, a dynamometer (42) being provided at the upper end of the connecting rod (41), and a mounting bracket (43) being provided at the top of the dynamometer (42); The clamping assembly (5) comprises a rectangular tube (51), the width of the inner hole of which is greater than the width of the template, the height of the inner hole is greater than the thickness of the template, the width direction of the rectangular tube (51) is consistent with the width direction of the track (1), a latch (52) is vertically penetrated through the top plate of the rectangular tube (51), the lower end of the latch (52) is located in the inner hole of the rectangular tube (51), and the side of the lower end of the latch (52) facing the front end of the rectangular tube (51) is an inclined surface, a spring (53) is provided on the top of the latch (52) for applying downward pressure to the latch (52), a connecting shaft (511) parallel to the width direction of the track (1) is provided on the side of the rectangular tube (51), the connecting shaft (511) is rotatably connected to the mounting bracket (43), and a sensor (54) for detecting the position of the latch (52) is provided on the rectangular tube (51).

2. A copper foil peeling strength testing device for copper clad laminates according to claim 1, characterized in that: An extension section (12) of the track (1) is provided at the rear of the track (1), and the clamping assembly (5) is located between the track (1) and the extension section (12).

3. The copper foil peeling strength testing device of a copper clad laminate according to claim 1, characterized in that: The grooving assembly (3) includes a driving motor (31) disposed above the track (1) and movable along the width direction of the track (1). A cylindrical milling cutter (32) is coaxially provided on the main shaft of the driving motor (31). The cylindrical milling cutter (32) faces vertically downward, and the height of the lower end thereof is in the same plane as the bottom surface of the base plate.

4. The copper foil peeling strength testing device of a copper clad laminate according to claim 1, characterized in that: A pair of parallel slide rails (33) are provided on the top of the track (1) along the width direction, a drive motor (31) is slidably provided on the slide rails (33), a telescopic device (34) is provided at one end of the slide rail (33), and a movable rod of the telescopic device (34) is connected to the drive motor (31).

5. The copper foil peeling strength testing device of a copper clad laminate according to claim 1, characterized in that: The top surface of the front end of the bottom plate of the rectangular tube (51) is a chamfered structure, and the axis of the connecting shaft (511) coincides with the center of the chamfered structure, and the latch (52) is located above the axis of the connecting shaft (511).

6. The copper foil peeling strength testing device of a copper clad laminate according to claim 5, characterized in that: There is a predetermined distance between the clamping assembly (5), the rear end of the track (1), and the groove assembly (3).

7. The copper foil peeling strength testing device of a copper clad laminate according to claim 1, characterized in that: A plurality of latches (52) are provided at intervals along the width direction of the rectangular tube (51), a gantry (55) is provided above the top plate of the rectangular tube (51), the tops of the springs (53) are in contact with the bottom surface of the crossbeam of the gantry (55), the tops of the latches (52) are provided with countersunk holes for accommodating the springs (53), the upper ends of the latches (52) are provided with convex edges, and the convex edges are located outside the rectangular tube (51), and the sensors (54) are provided on the side rods of the gantry (55).

8. The copper foil peeling strength testing device of a copper clad laminate according to claim 1, characterized in that: Coaxially arranged connecting shafts (511) are provided on both sides of the rectangular tube (51), and the connecting shafts (511) are rotatably arranged on the mounting bracket (43). A rectangular block (56) is provided on the outer end of the connecting shaft (511), and the rectangular block (56) has a first side surface (561) and a second side surface (562) that are perpendicular to and adjacent to each other. The first side surface (561) is parallel to the front end surface of the rectangular tube (51), and the second side surface (562) is parallel to the bottom plate of the rectangular tube (51). An arc-shaped tooth (563) having a quarter arc length is provided at the intersection of the first side surface (561) and the second side surface (562), and the axis of the arc-shaped tooth (563) is coaxial with the connecting shaft (511). A longitudinally arranged guide rail (13) is provided on both sides of the rear end of the track (1), and a protruding rack (131) is provided on the rear wall of the guide rail (13). The rack (131) is located in the middle section of the guide rail (13); When the first side surface (561) contacts the rear wall of the guide rail (13) above the rack (131), the arcuate teeth (563) engage with the rack (131), and the front end of the rectangular tube (51) is horizontally directed toward the track (1); When the second side surface (562) contacts the rear wall of the guide rail (13) below the rack (131), the arc-shaped teeth (563) separate from the rack (131), and the rectangular tube (51) is in a vertical state with the front end facing upward.

9. A method for testing the peel strength of copper foil of a copper clad laminate, characterized in that: The method is implemented using the copper foil peeling strength testing device of any one of claims 1 to 8, and the testing method comprises the following steps: Step 1: Place a copper-clad laminate sample of a predetermined width on the track (1), rotate the rectangular tube (51) around the connecting shaft (511) so that the front end of the rectangular tube (51) faces the track (1), and adjust the height of the connecting rod (41) so that the inner hole of the rectangular tube (51) is aligned with the sample; Step 2: Use the pushing assembly (2) to push the template toward the rear end of the track (1), so that the rear end of the template is inserted into the rectangular tube (51), and the upper edge of the rear end of the template slides in contact with the inclined surface of the lower end of the latch (52), so as to push the latch (52) upward. When the lower end of the latch (52) is pressed against the top surface of the template, the pushing assembly (2) stops pushing, and at this time the sensor (54) detects the upper end position of the latch (52), and the sensor (54) signal is turned on; Step 3: The cutting component (3) cuts the substrate of the sample into a front-end substrate and a rear-end substrate, and a cutting groove is formed at the cutting position of the substrate; Step 4: After the substrate is cut, the push assembly (2) continues to push the sample backward. When the cutting groove moves to below the latch (52), the latch (52) will drop and insert into the cutting groove. The upper end of the latch (52) moves out of the sensing range of the sensor (54), the signal of the sensor (54) is disconnected, and the pushing assembly (2) stops pushing. Step 5: The rectangular tube (51) is flipped around the connecting shaft (511), and the rear end of the rectangular tube (51) is swung downward by 90 degrees, so that the rectangular tube (51) is in a vertical state, and the latch (52) is pressed against the front end surface of the rear section substrate toward one side of the rear end of the rectangular tube (51); Step 6: Move the connecting rod (41) downward, and use the clamping assembly (5) to pull the rear substrate downward. During the downward movement of the rear substrate, the copper foil on the bottom surface of the front substrate will be separated from the front substrate. The data of the tensile gauge (42) during the descent of the connecting rod (41) is collected as a reference for the peeling strength of the copper foil.

Images