Discharging structure of furniture packaging line

Abstract

The invention discloses a discharging structure of a furniture packaging line, and relates to the technical field of packaging lines, and the discharging structure comprises a frame body, a conveying device and a glue pressing device; a discharging channel is arranged in the frame body. The conveying device comprises a plurality of conveying rollers and a first driving part; the conveying rollers are rotationally connected with the frame body; the conveying rollers are located at the bottom of the discharging channel. The first driving part is used for driving the plurality of conveying rollers to synchronously rotate in the same direction; the glue pressing device comprises a movable frame, a plurality of glue pressing pieces and a second driving piece; the movable frame is located at the top of the discharging channel, and the glue pressing piece is arranged on the movable frame and used for making contact with and abutting against a product; the movable frame is movably connected with the frame body, and the second driving piece is used for driving the movable frame to move. According to the application, the bonding effect of the packaged product can be effectively improved, and meanwhile, the probability of degumming in the process of moving and stacking the packaged product can be effectively reduced, so that the packaging quality of the product is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of packaging lines, and in particular to a material unloading structure of a furniture packaging line. Background Art

[0002] The packaging line is an automated production line for product packaging, which is widely used in food, medicine, chemical, electronics and other industries. Its main functions include product conveying, sorting, packaging, sealing, labeling, palletizing, etc., aiming to improve production efficiency, reduce labor costs and ensure packaging quality.

[0003] At present, in the production process of some furniture, packaging lines are also needed for product packaging, such as folding tables and chairs, bed frames, bar chairs, etc. In the common packaging lines for packaging folding chairs, it is usually necessary to first assemble and glue the packaging box into shape, then put the folding chair into the packaging box in a folded state, then glue and seal the packaging box, and finally unload and stack it through the unloading structure.

[0004] Among them, the quality of the bonding and sealing of the packaging box is crucial to the packaging quality of the product. However, in the existing packaging line, the staff usually use glue-spraying equipment to glue the sealing part of the packaging box, and then cover the sealing piece of the packaging box with glue to the main body of the box. The bonding effect is difficult to ensure, which easily leads to the subsequent debonding of the packaging box during the moving and stacking process, thus affecting the packaging quality of the product. Summary of the invention

[0005] The present application provides a material unloading structure for a furniture packaging line, which can effectively improve the bonding effect of the product after packaging, and can also effectively reduce the probability of debonding during the process of moving and stacking the product after packaging, thereby effectively improving the packaging quality of the product.

[0006] The present application provides a material unloading structure for a furniture packaging line, which adopts the following technical solution: A material unloading structure of a furniture packaging line, comprising a frame, a transport device and a glue pressing device; The frame body has a material discharge channel for the product to be discharged through, and the glue application equipment and the stacking platform are respectively close to the inlet end and the outlet end of the material discharge channel; The transport device comprises a plurality of transport rollers and a first driving member; the transport rollers are rotatably connected to the frame, and the rotation axis thereof is horizontal and perpendicular to the extension direction of the material discharge channel; the transport rollers are located at the bottom of the material discharge channel, and the plurality of transport rollers are evenly spaced along the extension direction of the material discharge channel; the first driving member is disposed on the frame, and is used to drive the plurality of transport rollers to rotate synchronously and in the same direction; The glue pressing device includes a movable frame, a plurality of glue pressing parts and a second driving part; the movable frame is arranged in the material discharge channel and is located at the top of the material discharge channel, the glue pressing parts are arranged on the movable frame, and are used to contact and abut against the sealing position of the product, and a plurality of the glue pressing parts are distributed on the movable frame at equal intervals along the extension direction of the material discharge channel; the movable frame is movably connected to the frame body in the vertical direction, and the second driving part is arranged on the frame body, and is used to drive the movable frame to move.

[0007] By adopting the above technical scheme, after the packaging box is glued and packaged, it is sent to the unloading channel with the seal facing upward. During the movement of the packaged product by the transportation device, the multiple glue pressing parts located above the product can exert a downward force on the product, so that the sealing piece and the box body are tightly attached to each other to ensure the glue bonding effect; at the same time, the packaging box is transported with the seal facing upward and under the action of the glue pressing device, the glue can be further evenly applied to the seal, and the probability of the glue flowing out under the action of gravity can be reduced; and the glue pressing device can be adjusted according to packaging boxes of different specifications and sizes, has high universality, and can achieve the glue pressing effect for packaging boxes of different specifications and sizes.

[0008] Optionally, the glue pressing piece is in a roller-shaped structure, which is rotatably connected to the movable frame, and its rotation axis is parallel to the rotation axis of the transport roller.

[0009] By adopting the above technical solution, while ensuring that the gluing device has a gluing effect on the packaging box, the damage to the packaging box caused by the gluing device can be effectively reduced, and the packaging box can be easily moved through the unloading channel under the transportation of the transportation device.

[0010] Optionally, the glue pressing device further includes a heater; the heater is disposed on the movable frame and is used to heat the plurality of glue pressing parts.

[0011] By adopting the above technical solution, the heat generated by the heater can be transferred to the glue at the sealing of the packaging box through the glue pressing part, accelerating the solidification of the glue, so that the glue can be solidified during the transportation of the packaging box through the unloading channel, thereby further reducing the probability of degumming during the process of moving and stacking the product after packaging.

[0012] Optionally, a heating chamber is provided inside the movable frame, a ventilation chamber is provided inside the pressed rubber part, and one end of the ventilation chamber is communicated with the heating chamber; the heater is arranged at a position of the movable frame close to the heating chamber to heat the air in the heating chamber.

[0013] By adopting the above technical solution, it can be ensured that the heater transfers heat by heating the air to achieve a baking effect on the glue, while reducing the probability that the packaging box is damaged due to excessive heat of the glue pressing parts, affecting the product packaging quality.

[0014] Optionally, a condensation chamber is further provided inside the movable frame, and ends of the plurality of ventilation chambers away from the heating chamber are all in communication with the condensation chamber; The movable frame is also externally connected with a drain pipe, and one end of the drain pipe is communicated with the condensation chamber.

[0015] By adopting the above technical solution, the water condensed from the air heated by the heater can be discharged in time, thereby effectively reducing the influence of the condensed water on the glue baking effect of the glue pressing device.

[0016] Optionally, the rubber pressing part is provided with a spiral blade in the ventilation cavity, and when the rubber pressing part rotates with the product being discharged, the spiral blade forms an airflow in the ventilation cavity that moves toward the condensation cavity.

[0017] By adopting the above technical scheme, when a product is discharged through the discharge channel, the glue pressing part rotates with the movement of the product, and the spiral blades inside it can drive the air heated by the heater in the heating chamber to enter the condensation chamber through the ventilation chamber, thereby making the glue baking effect of the glue pressing device on the product more stable and reliable; and, when there is condensed water in the ventilation chamber, the spiral blades can also drive the condensed water to flow into the condensation chamber by rotating with the glue pressing part, further reducing the influence of the condensed water on the glue baking effect of the glue pressing device.

[0018] Optionally, the glue pressing part is composed of a plurality of glue pressing units which are rotatably connected to each other, and an independent spiral sheet is arranged inside each of the glue pressing units.

[0019] By adopting the above technical solution, when the product is discharged through the discharge channel, only the glue pressing unit in contact with the product rotates accordingly, so that the air with higher heat close to the heating chamber can enter the ventilation cavity inside the glue pressing unit where the product needs to be glued, thereby ensuring the glue baking effect of the glue pressing device while improving the utilization rate of the air heated by the heater.

[0020] Optionally, the heater heats a position of the heating chamber close to an inlet end of the feeding channel.

[0021] By adopting the above technical solution, the baking temperature of the product will gradually decrease when passing through the feeding channel, thereby improving the drying effect of the glue pressing device on the glue, which is conducive to the uniform curing of the glue, reducing defects, and ensuring the final performance of the glue after solidification.

[0022] Optionally, the cross-sectional area of ​​the ventilation cavity in the plurality of the pressed rubber parts gradually decreases along the cutting direction of the product.

[0023] By adopting the above technical solution, the baking temperature of the product when passing through the feeding channel can be gradually reduced, thereby further improving the drying effect of the glue pressing device on the glue, further improving the glue bonding effect, and further improving the packaging quality of the product.

[0024] Optionally, radial dimensions of the plurality of glue pressing parts gradually increase along a material feeding direction of the product.

[0025] By adopting the above technical solution, the force exerted by the glue pressing parts on the product when passing through the feeding channel can be gradually increased, so that the gluing effect of the gluing device on the packaging box can be gradually improved, reducing the probability of the packaging box being damaged in this process, and further facilitating the packaging box to pass through the feeding channel when transported by the transportation device.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. It can effectively improve the bonding effect of the product after packaging, and at the same time effectively reduce the probability of debonding during the process of moving and stacking the product after packaging, thereby effectively improving the packaging quality of the product; 2. It can play the role of pressing and baking glue on the sealing part of the product during the process of product unloading, thus improving the quality of product bonding and packaging; 3. During the process of product feeding, the glue pressing effect is gradually enhanced and the glue baking temperature is gradually reduced, which can effectively improve the glue pressing and glue baking effects, thereby further improving the packaging quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of one side of a material unloading structure of a furniture packaging line according to an embodiment of the present application; Figure 2 It is a structural schematic diagram of the other side of a material unloading structure of a furniture packaging line according to an embodiment of the present application; Figure 3 is a cross-sectional view of a material unloading structure of a furniture packaging line according to an embodiment of the present application; Figure 4 It is a cross-sectional view of the glue pressing device in the embodiment of the present application.

[0028] Explanation of the reference numerals: 1. frame; 11. material discharge channel; 2. transport device; 21. transport roller; 22. first driving member; 3. glue pressing device; 31. movable frame; 311. heating chamber; 312. condensing chamber; 32. second driving member; 33. glue pressing member; 331. glue pressing unit; 332. ventilation chamber; 34. heater; 35. drain pipe; 36. spiral blade. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses a material unloading structure of a furniture packaging line, which is used to transport and move packaging boxes to a stacking table for temporary stacking after the furniture is glued and packaged, and then transfer and transport multiple packaging boxes to a designated location for unified stacking.

[0031] Reference Figure 1 and Figure 2 The material discharging structure includes a frame 1, a transport device 2 and a glue pressing device 3. The frame 1 is used as a mounting carrier for the transport device 2 and the glue pressing device 3; the transport device 2 is used to transport the packaged product; and the glue pressing device 3 is used to improve the bonding and sealing effect of the product.

[0032] The frame 1 is a rectangular frame structure as a whole, and has a feeding channel 11 inside for the packaged products to be fed and moved. The feeding channel 11 extends along the length direction of the frame 1. During the feeding process, the products can pass through the inside of the frame 1 along the extension direction of the feeding channel 11.

[0033] The transport device 2 is installed at the bottom of the frame 1 to support the product and drive the product to move along the feeding channel 11 .

[0034] The transport device 2 includes a plurality of transport rollers 21 and a first driving member 22 .

[0035] The transport roller 21 is an overall cylindrical structure, and both ends of the transport roller 21 in the axial direction are rotatably connected to the frame 1, and its rotation axis coincides with its own axis and is parallel to the width direction of the frame 1; multiple transport rollers 21 are evenly distributed on the frame 1 along the length direction of the frame 1, and the spacing between adjacent transport rollers 21 is sufficient to ensure that the product can stably pass through the discharge channel 11 along the extension direction of the discharge channel 11 under the support and transportation of multiple transport rollers 21.

[0036] The first driving member 22 is fixedly installed on one side of the frame 1 in the width direction, and is used to drive the multiple transport rollers 21 to rotate synchronously and in the same direction relative to the frame 1. In this embodiment, the first driving member 22 is preferably a servo motor, and its output end is fixedly connected to a transport roller 21, directly driving the transport roller 21 to rotate relative to the frame 1; and preferably, the multiple transport rollers 21 are synchronously and in the same direction through a synchronous belt; since the servo motor and the synchronous belt are both common existing technologies, they are not described here in detail, and the first driving member 22 is only briefly indicated in the drawings, and the synchronous belt is omitted.

[0037] The glue pressing device 3 comprises a movable frame 31 , a plurality of glue pressing members 33 and a second driving member 32 .

[0038] The movable frame 31 is a rectangular frame structure as a whole, which is installed on the frame 1 and located at the top of the feeding channel 11, and its length and width directions are respectively parallel to the length and width directions of the frame 1; the movable frame 31 can move in the vertical direction relative to the frame 1 at the top of the feeding channel 11, and when the product is unloaded and moved through the feeding channel 11, the movable frame 31 remains above the product.

[0039] The second driving member 32 is fixedly mounted on the top of the frame 1, and is used to drive the movable frame 31 to move relative to the frame 1. In this embodiment, the second driving member 32 preferably drives the movable frame 31 to move by screw transmission, so that the staff can fine-tune the height position of the movable frame 31 in the feeding channel 11; in this embodiment, since screw transmission is a common prior art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0040] The rubber pressing piece 33 is a cylindrical structure as a whole, which is installed in the hollow position in the middle of the movable frame 31. Its axis direction is parallel to the width direction of the movable frame 31, and multiple rubber pressing pieces 33 are evenly distributed on the movable frame 31 along the length direction of the movable frame 31.

[0041] During the process of the product being unloaded and moved through the unloading channel 11, after the staff adjusts the height position of the movable frame 31 in the unloading channel 11, the multiple glue pressing parts 33 can all contact and resist the sealing piece located on the top of the product and exert a downward force thereon to drive it to keep in contact with the box body, while making the glue distribution between the sealing piece and the box body more even, thereby improving the glue bonding effect.

[0042] Reference Figure 3 and Figure 4 The glue pressing device 3 also includes a heater 34 and a drain pipe 35, so that the glue pressing device 3 can accelerate the solidification of the glue while pressing the glue at the sealing position of the product, so that the glue solidifies when the product is being fed and moved through the feeding channel 11.

[0043] A heating chamber 311 and a condensing chamber 312 are respectively provided inside the movable frame 31 on both sides in the width direction, and a ventilation chamber 332 is provided inside the pressed rubber part 33 along its own axial direction, and the two ends of the ventilation chamber 332 are respectively connected to the heating chamber 311 and the condensing chamber 312.

[0044] The heater 34 is fixedly mounted on one side of the movable frame 31 close to the heating chamber 311, and is located at a position of the movable frame 31 close to the inlet end of the material discharge channel 11, and can heat the air in the heating chamber 311 close to the inlet end of the material discharge channel 11. In this embodiment, since the heater 34 with the above functions is a common prior art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0045] The drain pipe 35 is fixedly installed on one side of the movable frame 31 close to the condensation chamber 312, and one end of its top is connected to the position of the condensation chamber 312 close to the outlet end of the feeding channel 11, and one end of its bottom is vertical to the ground and a container is correspondingly provided to collect condensed water. In this embodiment, it is preferred that the cavity wall at the bottom of the condensation chamber 312 is designed to be inclined downward toward the direction close to the drain pipe 35, so that the condensed water in the condensation chamber 312 can be drained in time through the drain pipe 35; since the drain pipe 35 with the above-mentioned function is a common prior art, it will not be described in detail here, and the drain pipe 35 is only briefly indicated in the drawings and the container for collecting condensed water is omitted.

[0046] At this time, after the heater 34 heats the air in the heating chamber 311, the heated air can enter the condensation chamber 312 through multiple ventilation chambers 332; the heated air in the ventilation chamber 332 can transfer the heat through the glue pressing piece 33 to the sealing position of the product at the top that contacts and abuts against the glue pressing piece 33, thereby accelerating the solidification speed of the glue and ensuring the bonding strength of the glue after solidification; the heated air entering the condensation chamber 312 will form condensed water after the temperature drops, and finally the condensed water in the condensation chamber 312 will be discharged through the drain pipe 35.

[0047] Among them, the heater 34 directly heats the air in the heating chamber 311 located near the inlet end of the discharge channel 11, which can gradually reduce the temperature of the heated air in the heating chamber 311 along the length direction of the movable frame 31, thereby gradually weakening the baking effect of the multiple glue pressing parts 33 on the product sealing position, which is beneficial to the uniform curing of the glue, reduces defects, and ensures the final performance of the glue after solidification.

[0048] Reference Figure 1 and Figure 3 Furthermore, it is preferred that the radial dimensions of the plurality of rubber pressing parts 33 are different, and the radial dimensions of the plurality of rubber pressing parts 33 gradually increase along the direction of the product feeding movement.

[0049] At this time, as the product is being fed and moved through the feeding channel 11, the gluing effects of different gluing parts 33 on the product sealing positions will gradually increase, making the gluing effect of the gluing device 3 on the product more gradual, reducing the probability of the product being damaged after being subjected to the force of the gluing parts 33, while ensuring the gluing effect of the gluing device 3 on the product.

[0050] Reference Figure 3 and Figure 4 Furthermore, it is preferred that the cross-sectional areas of the ventilation cavities 332 of the plurality of rubber pressing parts 33 are different, and the cross-sectional areas of the ventilation cavities 332 of the plurality of rubber pressing parts 33 gradually decrease along the direction of product feeding and movement.

[0051] At this time, the amount of heated air flowing in the ventilation cavity 332 of different glue pressing parts 33 is different, so that the temperature that can be transmitted to the sealing position of the product by different glue pressing parts 33 is also different. In the process of the product being unloaded and moved through the unloading channel 11, the baking effect on the sealing position of the product will gradually weaken, which is further conducive to the uniform curing of the glue, reduces defects, and ensures the final performance of the glue after solidification.

[0052] Reference Figure 2 and Figure 4 Furthermore, it is preferred that the glue pressing part 33 is formed as a whole by splicing a plurality of glue pressing units 331 that are rotatably connected to each other, and the internal spaces of the plurality of glue pressing units 331 are connected to form a ventilation cavity 332 .

[0053] A spiral blade 36 is fixedly installed inside each glue pressing unit 331, and the spiral blade 36 is located in the ventilation cavity 332, and the axis of the spiral blade 36 coincides with the axis of the glue pressing unit 331; in the process of the heated air in the heating cavity 311 entering the condensation cavity 312 through the ventilation cavity 332, the heated air will move along a spiral trajectory in the ventilation cavity 332 under the guidance of the spiral blade 36, thereby extending the time that the heated air stays in the ventilation cavity 332 to fully utilize the heat of the heated air.

[0054] During the process of the product being unloaded and moving through the unloading channel 11, one or more glue pressing units 331 in contact with the top of the product will rotate relative to the movable frame 31 as the product moves; during the rotation of the glue pressing unit 331, the spiral blade 36 inside it will drive the heated air in the corresponding ventilation cavity 332 to flow in the direction close to the condensation cavity 312, so that the heated air in the heating cavity 311 can flow toward the space inside the glue pressing unit 331, so as to facilitate the subsequent part of the product sealing position to achieve the baking effect; and, when the heated air forms condensed water in the ventilation cavity 332 due to the decrease in temperature, the glue pressing unit 331 can also drive the condensed water inside it to flow in the direction close to the condensation cavity 312 during its rotation, thereby effectively reducing the probability of condensed water remaining in the ventilation cavity 332 and affecting the baking effect of the glue pressing device 3 on the product.

[0055] The implementation principle of the unloading structure of a furniture packaging line in the embodiment of the present application is as follows: After the staff has finished gluing and sealing the product, they will put the product into the unloading channel 11 with the sealing position facing upwards. The transport device 2 will drive the product to move through the unloading channel 11 and then temporarily park it on the stacking platform. When the product passes through the feeding channel 11, the sealing position on the top of the product will be successively subjected to the pressure of the multiple glue pressing parts 33, so that the sealing piece on the top of the product and the box body are kept in close contact with each other and the degree of close contact increases gradually, so that the glue at the sealing position of the product is more evenly distributed after being pressed, and the bonding effect of the glue can be improved; At the same time, the air heated by the heater 34 in the heating chamber 311 can be driven by the rotating spiral blade 36 to flow through the ventilation chamber 332 toward the inner space of the corresponding glue pressing unit 331 when the part of the glue pressing unit 331 rotates with the product unloading movement. The heated air transfers heat to the glue at the sealing position of the product through the glue pressing part 33, thereby accelerating the solidification speed of the glue and improving the quality of the glue after solidification. The condensed water formed after the temperature of the heated air is reduced can enter the condensation chamber 312 and be discharged through the drain pipe 35. After the product is unloaded and moves out of the unloading channel 11, the glue at the sealing position of the product solidifies, completing high-quality packaging of the product at the sealing position, thereby improving the packaging quality of the product.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A material unloading structure for a furniture packaging line, characterized in that: It comprises a frame (1), a transport device (2) and a glue pressing device (3); The frame (1) has a material discharge channel (11) inside for the product to be discharged, and the glue application equipment and the stacking platform are respectively close to the inlet end and the outlet end of the material discharge channel (11); The transport device (2) comprises a plurality of transport rollers (21) and a first driving member (22); the transport rollers (21) are rotatably connected to the frame (1), and the rotation axis thereof is horizontal and perpendicular to the extension direction of the material discharge channel (11); the transport rollers (21) are located at the bottom of the material discharge channel (11), and the plurality of transport rollers (21) are distributed at equal intervals along the extension direction of the material discharge channel (11); the first driving member (22) is arranged on the frame (1) and is used to drive the plurality of transport rollers (21) to rotate synchronously and in the same direction; The glue pressing device (3) comprises a movable frame (31), a plurality of glue pressing parts (33) and a second driving part (32); the movable frame (31) is arranged in the material discharge channel (11) and is located at the top of the material discharge channel (11); the glue pressing parts (33) are arranged on the movable frame (31) and are used to contact and abut against the sealing position of the product, and the plurality of glue pressing parts (33) are evenly spaced on the movable frame (31) along the extension direction of the material discharge channel (11); the movable frame (31) is movably connected to the frame body (1) in the vertical direction; the second driving part (32) is arranged on the frame body (1) and is used to drive the movable frame (31) to move.

2. The unloading structure of a furniture packaging line according to claim 1 is characterized in that: The glue pressing piece (33) is in a roller-shaped structure, is rotatably connected to the movable frame (31), and its rotation axis is parallel to the rotation axis of the transport roller (21).

3. The unloading structure of the furniture packaging line according to claim 2 is characterized in that: The glue pressing device (3) further comprises a heater (34); the heater (34) is arranged on the movable frame (31) and is used to heat the plurality of glue pressing parts (33).

4. The unloading structure of the furniture packaging line according to claim 3 is characterized in that: A heating chamber (311) is provided inside the movable frame (31), a ventilation chamber (332) is provided inside the pressed rubber part (33), and one end of the ventilation chamber (332) is communicated with the heating chamber (311); the heater (34) is arranged at a position of the movable frame (31) close to the heating chamber (311) and is used to heat the air in the heating chamber (311).

5. The unloading structure of the furniture packaging line according to claim 4 is characterized in that: A condensation chamber (312) is also provided inside the movable frame (31), and ends of the plurality of ventilation chambers (332) away from the heating chamber (311) are all in communication with the condensation chamber (312); The movable frame (31) is also externally connected to a drainage pipe (35), and one end of the drainage pipe (35) is in communication with the condensation chamber (312).

6. The unloading structure of the furniture packaging line according to claim 5 is characterized in that: The rubber pressing part (33) is provided with a spiral blade (36) in the ventilation cavity (332); when the rubber pressing part (33) rotates with the discharge of the product, the spiral blade (36) forms an airflow in the ventilation cavity (332) that moves toward the condensation cavity (312).

7. The unloading structure of the furniture packaging line according to claim 6 is characterized in that: The glue pressing member (33) is composed of a plurality of glue pressing units (331) that are rotatably connected to each other, and each of the glue pressing units (331) is provided with an independent spiral sheet (36) inside.

8. The unloading structure of the furniture packaging line according to claim 4 is characterized in that: The heater (34) heats a position of the heating chamber (311) close to an inlet end of the material discharge channel (11).

9. The unloading structure of the furniture packaging line according to claim 8, characterized in that: The cross-sectional area of ​​the ventilation cavity (332) in the plurality of the pressed rubber parts (33) gradually decreases along the feeding direction of the product.

10. The unloading structure of the furniture packaging line according to claim 2, characterized in that: The radial dimensions of the plurality of glue pressing parts (33) gradually increase along the cutting direction of the product.

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