A method for preventing delamination of the edge of a sound insulation pad
By pre-edge the edges during the production process of sound insulation pads, the problem of edges of sound insulation pads is solved, the post-processing process is simplified, and the production cost is reduced.
Patent Information
- Application Number
- CN202411320293.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-04-04
AI Technical Summary
In the existing sound insulation pad production process, the cutting edge of the punching mold causes the edge of the sound insulation pad to be easily layered, resulting in uneven edges, which increases the complexity and cost of edge sealing and coloring processing.
By pre-editing the edges of the sound insulation pad during the mold depressing process, the pre-editing area is located at 10mm-20mm of the blade edge, and the thickness is 12-24% of the finished product thickness of the sound insulation pad, so as to evenly distribute the tensile force to avoid the tensile force concentration on the mold cutting edge and edge.
Effectively prevent the edge layering of sound insulation pads, simplify the later edge sealing and coloring process, reduce production costs, and improve production efficiency.
Smart Images
Figure CN119748566A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of sound insulation pad manufacturing, and in particular to a method for preventing delamination of edges of sound insulation pads. Background Art
[0002] With the development of automobile industry technology, in an era of pursuing high performance, environmental protection and comfort, the sound insulation effect of automobiles, like the performance of automobiles, has received more and more attention. The higher the quality of the car, the better the sound insulation effect. Therefore, the automobile industry has higher and higher requirements for automobile sound insulation pads. Sound insulation pads are usually used to reduce the noise of automobile engines and mechanical components, block the heat conducted by the engine, and protect the car paint from damage. At present, the common production process of sound insulation pads is hot pressing integrated punching and forming. Its working principle is to soften the resin or rubber powder through high temperature after mold closing, and bond the surface cloth, base cloth and glass wool or lightweight PU together. The material is cut with high pressure using the direct pressure mold blade, and then the edge is sealed and colored after cutting.
[0003] However, there are some problems with the existing production process of sound insulation pads. The cutting edge of the punching die is usually in the shape of a figure 7. During the pressing process of the die, the tensile force is mainly concentrated on the cutting edge. When the sound insulation pad is punched and cut after hot pressing, the sound insulation pad is affected by the tensile force. After the punching is completed, the edge near the cutting edge is prone to stratification, resulting in uneven edges of the sound insulation pad. This leads to the fact that when the sound insulation pad is edge-sealed and colored in the later stage of production, the processing method is more complicated than the conventional process, the operation is more difficult, and the production cost of the enterprise is increased. Summary of the invention
[0004] In order to solve the technical problem in the prior art that the edges of the sound insulation pads are prone to delamination after punching, resulting in uneven edges of the sound insulation pads, which leads to the edge sealing and coloring of the products in the later stage of production of the sound insulation pads being more complicated than conventional processes, difficult to operate, and increased production costs for enterprises, the present invention provides the following technical solutions.
[0005] The present invention provides a method for preventing the edge of a sound insulation pad from being delaminated, comprising the following steps: S1: setting working parameters, and waiting for the mold temperature to reach the set parameters; S2: laying a bottom layer, a middle layer, and a surface layer in sequence from bottom to top, and sending the laid and stacked materials into the mold and placing them in the center; S3: starting the equipment mold to press it down to a slow-down point and decelerate; S4: pre-sealing the edge of the sound insulation pad, and simultaneously performing hot pressing molding and punching and splitting on the sound insulation pad material.
[0006] As a further technical solution, in step S4, when pre-sealing the edge of the sound insulation pad, the mold blade first contacts the surface layer and gradually stretches the surface layer, middle layer and bottom layer, and then the pre-sealing part of the mold pre-seales the surface layer, middle layer and bottom layer.
[0007] As a further technical solution, in step S4, when pre-sealing the edge of the sound insulation pad, the mold blade and the mold edge simultaneously stretch and pre-seal the surface layer, middle layer and bottom layer respectively. After the pre-sealing part of the mold meets the pre-sealing requirements for the edge of the sound insulation pad, the mold blade continues the punching operation.
[0008] As a further technical solution, in step S4, the pre-sealing treatment of the surface layer, middle layer and bottom layer means that the pre-sealing parts of the upper and lower molds of the mold simultaneously extrude the surface layer, middle layer and bottom layer to form a pre-sealed area at the edge of the sound insulation pad.
[0009] As a further technical solution, the pre-sealed edge area of the edge of the sound insulation pad is located in the middle position of the sound insulation pad in the horizontal direction.
[0010] As a further technical solution, in step S4, the sound insulation pad material is compacted while pre-sealing the edge, and after high-temperature thermoplastic bonding and shaping by a mold, the tensile force in the pre-sealed edge area is evenly distributed.
[0011] As a further technical solution, in step S4, the thickness of the pre-sealed edge area is 12-24% of the thickness of the finished sound insulation pad.
[0012] As a further technical solution, in step S4, the thickness of the pre-sealed edge area is 18% of the thickness of the finished sound insulation pad.
[0013] As a further technical solution, in step S4, the edge of the sound insulation pad is pre-sealed in a stepped manner.
[0014] As a further technical solution, in step S4, the pre-sealed edge area is located 10 mm to 20 mm from the blade edge.
[0015] The beneficial effects of the present invention are as follows: the method for preventing the edge of the sound insulation pad from being delaminated can concentrate the stress points in the pre-sealed edge area when the mold is pressed down, and compact the surface layer, the middle layer and the bottom layer and bond them after high-temperature thermoplasticization. The tensile force near the pre-sealed edge area is evenly distributed, avoiding the tensile force from being concentrated on the mold blade and the edge of the sound insulation pad, reducing the tensile force of the mold blade on the sound insulation pad, and preventing the edge of the sound insulation pad from being delaminated. In this way, the edge sealing and coloring processes of the sound insulation pad after the pre-sealing are simple and easy to operate in the later production stages, which reduces the production cost while improving the production efficiency of the sound insulation pad. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is the shape of the sound insulation pad in the method for preventing the edge of the sound insulation pad from delamination of the present invention;
[0017] In the figure: 1-sound insulation pad; 2-surface layer; 3-bottom layer; 4-middle layer; 5-rubber layer; 6-pre-sealed edge area. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0019] The present invention provides a method for preventing the edge of a sound insulation pad from delaminating, comprising the following steps:
[0020] S1: setting working parameters and waiting for the mold temperature to reach the set parameters. In this step, the working parameters of the mold adopt the existing technology and will not be described in detail;
[0021] S2: Lay the bottom layer 3, middle layer 4 and surface layer 2 in sequence from bottom to top, and send the laid and stacked materials into the mold and place them in the center. The materials used for the bottom layer 3, middle layer 4 and surface layer 2 are existing technologies and will not be described in detail.
[0022] S3: Start the equipment and press the mold down to the slow-down point to decelerate. The deceleration operation adopts the existing downward method, which will not be described in detail.
[0023] S4: Pre-seal the edge of the sound insulation pad, and at the same time, perform hot pressing and punching on the sound insulation pad material.
[0024] In step S4, when the edge of the sound insulation pad is pre-sealed, it can be divided into two methods. The first pre-sealing method: the mold blade first contacts the surface layer 2 and gradually stretches the surface layer 2, the middle layer 4 and the bottom layer 3, and then the pre-sealing part of the mold performs pre-sealing treatment on the surface layer 2, the middle layer 4 and the bottom layer 3. The second pre-sealing method: the mold blade and the mold edge simultaneously stretch and pre-seale the surface layer 2, the middle layer 4 and the bottom layer 3, respectively. After the pre-sealing part of the mold meets the pre-sealing requirements of the edge of the sound insulation pad, the mold blade continues the punching operation.
[0025] It should be known that the pre-sealing treatment of the surface layer 2, the middle layer 4 and the bottom layer 3 means that the pre-sealing parts of the upper and lower molds of the mold simultaneously extrude the surface layer 2, the middle layer 4 and the bottom layer 3, so that the edge of the sound insulation pad forms a pre-sealed area 6, thereby the subsequent edge sealing and coloring processes after the sound insulation pad is formed are simple and easy to operate.
[0026] Preferably, the pre-sealed edge area 6 of the sound insulation pad is located in the middle of the sound insulation pad in the horizontal direction. The sound insulation pad material is compacted while pre-sealing, and the tensile force of the pre-sealed edge area 6 is evenly distributed after high-temperature thermoplastic bonding and shaping by the mold.
[0027] In step S4, the horizontal length of the pre-sealed edge area 6 is consistent with the edge length of the finished sound insulation pad, or is greater than the edge length of the finished sound insulation pad, and there is no special limitation on it. The present invention has certain requirements on the thickness of the pre-sealed edge area 6. Preferably, the thickness of the pre-sealed edge area 6 is 12%-24% of the thickness of the finished sound insulation pad. The thickness of the pre-sealed edge area 6 within this range can further make the tensile force of the pre-sealed edge area 6 evenly distributed, and prevent the edge of the sound insulation pad from being delaminated when the mold blade is punched. More preferably, the thickness of the pre-sealed edge area 6 is 18% of the thickness of the finished sound insulation pad.
[0028] Of course, although the thickness of the pre-sealed edge area 6 is preferably 12%-24% of the thickness of the finished sound insulation pad, a more approximate value such as 11.9% or 24.1% of the thickness of the finished sound insulation pad is also acceptable, which also has a certain effect on preventing the edge of the sound insulation pad from delamination.
[0029] The pre-sealing method of the edge of the sound insulation pad can be a step-type pre-sealing or a one-time pre-sealing, and there is no special limitation on it. It should be known that the pre-sealing area 6 is located 10mm-20mm from the mold edge, thereby reducing the waste of sound insulation pad materials and making the tensile force of the mold edge on the pre-sealing area 6 evenly distributed.
[0030] The above-mentioned method for preventing delamination of the edge of the sound insulation pad is now further described in conjunction with embodiments. The raw materials and processes used in the following embodiments, unless otherwise specified, are conventional materials and processes known to ordinary technicians in the field.
[0031] Embodiment 1:
[0032] Set the working parameters and wait for the mold temperature to reach the set parameters. The mold adopts the hot mold and cold material form. The upper and lower molds of the mold are set to target temperatures of 160℃-200℃ respectively, the pressure is set to 11-15Mpa, the pressure is maintained for 85-95s, and the press stroke and fast-turn and slow-down parameters are set according to the mold height.
[0033] From bottom to top, lay the bottom layer 3, middle layer 4 and surface layer 2 in sequence, where the surface layer 2 is a high-weight non-woven fabric, the rubber layer 5 is a PE film or rubber powder, the bottom layer 3 is a low-weight non-woven fabric, and the middle layer 4 is a cotton layer or PU layer. Put the laid and stacked materials into the mold and place them in the center, start the equipment, press the mold down to the slow-down point, and decelerate.
[0034] In the first pre-sealing method, the mold blade first contacts the surface layer 2 and gradually stretches the surface layer 2, the middle layer 4 and the bottom layer 3. Then, the pre-sealing part of the mold pre-seales the surface layer 2, the middle layer 4 and the bottom layer 3. The pre-sealing area 6 is located 10mm-20mm from the mold blade, and the thickness of the pre-sealing area 6 is 12% of the thickness of the finished sound insulation pad. While pre-sealing, the sound insulation pad material is hot-pressed and punched.
[0035] Embodiment 2:
[0036] Set the working parameters and wait for the mold temperature to reach the set parameters. The mold adopts the hot mold and cold material form. The upper and lower molds of the mold are set to target temperatures of 160℃-200℃ respectively, the pressure is set to 11-15Mpa, the pressure is maintained for 85-95s, and the press stroke and fast-turn and slow-down parameters are set according to the mold height.
[0037] From bottom to top, lay the bottom layer 3, middle layer 4 and surface layer 2 in sequence, where the surface layer 2 is a high-weight non-woven fabric, the rubber layer 5 is a PE film or rubber powder, the bottom layer 3 is a low-weight non-woven fabric, and the middle layer 4 is a cotton layer or PU layer. Put the laid and stacked materials into the mold and place them in the center, start the equipment, press the mold down to the slow-down point, and decelerate.
[0038] In the first pre-sealing method, the mold blade first contacts the surface layer 2 and gradually stretches the surface layer 2, the middle layer 4 and the bottom layer 3. Then, the pre-sealing part of the mold pre-seales the surface layer 2, the middle layer 4 and the bottom layer 3. The pre-sealing area 6 is located 10mm-20mm from the mold blade, and the thickness of the pre-sealing area 6 is 18% of the thickness of the finished sound insulation pad. While pre-sealing, the sound insulation pad material is hot-pressed and punched.
[0039] Embodiment 3:
[0040] Set the working parameters and wait for the mold temperature to reach the set parameters. The mold adopts the hot mold and cold material form. The upper and lower molds of the mold are set to target temperatures of 160℃-200℃ respectively, the pressure is set to 11-15Mpa, the pressure is maintained for 85-95s, and the press stroke and fast-turn and slow-down parameters are set according to the mold height.
[0041] From bottom to top, lay the bottom layer 3, middle layer 4 and surface layer 2 in sequence, where the surface layer 2 is a high-weight non-woven fabric, the rubber layer 5 is a PE film or rubber powder, the bottom layer 3 is a low-weight non-woven fabric, and the middle layer 4 is a cotton layer or PU layer. Put the laid and stacked materials into the mold and place them in the center, start the equipment, press the mold down to the slow-down point, and decelerate.
[0042] In the first pre-sealing method, the mold blade first contacts the surface layer 2 and gradually stretches the surface layer 2, the middle layer 4 and the bottom layer 3. Then, the pre-sealing part of the mold pre-seales the surface layer 2, the middle layer 4 and the bottom layer 3. The pre-sealing area 6 is located 10mm-20mm from the mold blade, and the thickness of the pre-sealing area 6 is 24% of the thickness of the finished sound insulation pad. While pre-sealing, the sound insulation pad material is hot-pressed and punched.
[0043] Embodiment 4:
[0044] Compared with Example 1, Example 4 differs in that Example 4 adopts the second pre-edge sealing method, and the other steps of Example 4 are consistent with those of Example 1.
[0045] Embodiment 5:
[0046] Compared with Example 2, Example 5 differs in that Example 5 adopts the second pre-edge sealing method, and the other steps of Example 5 are consistent with those of Example 2.
[0047] Embodiment 6:
[0048] Compared with Example 3, Example 6 differs in that Example 6 adopts the second pre-edge sealing method, and the other steps of Example 6 are consistent with those of Example 3.
[0049] Comparative Example 1:
[0050] Comparative Example 1 does not adopt the step of pre-sealing the edge of the sound insulation pad in Example 1, and the other steps are the same as Example 1.
[0051] Comparative Example 2:
[0052] The thickness of the pre-sealed edge area in Comparative Example 2 is 10% of the thickness of the finished sound insulation pad, and the other steps are the same as those in Example 1.
[0053] Comparative Example 3:
[0054] The thickness of the pre-sealed edge area in Comparative Example 3 is 30% of the thickness of the finished sound insulation pad, and the other steps are the same as those in Example 1.
[0055] The edges of the sound insulation pads prepared in the above-mentioned Examples 1-6 and Comparative Examples 1-3 were observed and compared. The edges of the sound insulation pads prepared in Examples 1-6 had no stratification or no obvious stratification, which was convenient for the later edge sealing and coloring of the sound insulation pads. The edges of the sound insulation pads prepared in Comparative Examples 1-3 had obvious stratification of different sizes, which was not convenient for the later edge sealing and coloring of the sound insulation pads.
[0056] The edge delamination of the sound insulation pads prepared in the above Examples 1-6 and Comparative Examples 1-3 is as follows:
[0057] Layering Eligibility Example 1 No obvious stratification qualified Example 2 No stratification qualified Example 3 No obvious stratification qualified Example 4 No stratification qualified Example 5 No stratification qualified Example 6 No stratification qualified Comparative Example 1 Obvious stratification Failure Comparative Example 2 Obvious stratification Failure Comparative Example 3 Obvious stratification Failure
[0058] From the analysis of the above-mentioned Examples 1-6 and Comparative Examples 1-3, it can be seen that the edges of the sound insulation pads prepared by the method for preventing the stratification of the edges of the sound insulation pads of the present invention have no stratification or no obvious stratification, and the edge sealing and coloring processes of the sound insulation pads after pre-sealing are simple and easy to operate in the later production stages, which reduces the production cost and improves the production efficiency of the sound insulation pads.
[0059] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments. Various changes or equivalent substitutions can be made within the knowledge scope of those skilled in the art without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.
Claims
1. A method for preventing the edge of a sound insulation pad from delaminating, characterized in that: The steps include: S1: Set working parameters and wait for the mold temperature to reach the set parameters; S2: Laying the bottom layer (3), the middle layer (4) and the surface layer (2) in order from bottom to top, and sending the laid and stacked materials into the mold and placing them in the center; S3: Start the equipment and press the mold down to the slow point to decelerate; S4: Pre-seal the edge of the sound insulation pad, and at the same time, perform hot pressing and punching on the sound insulation pad material.
2. The method for preventing edge delamination of a sound insulation pad according to claim 1, characterized in that: In step S4, when pre-sealing the edge of the sound insulation pad, the mold blade first contacts the surface layer (2) and gradually stretches the surface layer (2), the middle layer (4) and the bottom layer (3), and then the pre-sealing part of the mold performs pre-sealing treatment on the surface layer (2), the middle layer (4) and the bottom layer (3).
3. The method for preventing edge delamination of a sound insulation pad according to claim 1, characterized in that: In step S4, when the edge of the sound insulation pad is pre-sealed, the mold blade and the pre-sealing part of the mold simultaneously stretch and pre-seal the surface layer (2), the middle layer (4) and the bottom layer (3), respectively. After the pre-sealing part of the mold meets the pre-sealing requirements for the edge of the sound insulation pad, the mold blade continues the punching operation.
4. The method for preventing edge delamination of a sound insulation pad according to claim 2 or 3, characterized in that: In step S4, the pre-sealing treatment of the surface layer (2), the middle layer (4) and the bottom layer (3) means that the pre-sealing parts of the upper and lower molds of the mold simultaneously extrude the surface layer (2), the middle layer (4) and the bottom layer (3) so that the edge of the sound insulation pad forms a pre-sealed area (6).
5. The method for preventing edge delamination of a sound insulation pad according to claim 4, characterized in that: The pre-sealed edge area (6) of the edge of the sound insulation pad is located in the middle of the sound insulation pad in the horizontal direction.
6. The method for preventing edge delamination of a sound insulation pad according to claim 4, characterized in that: In the step S4, the sound insulation pad material is compacted while the edge is pre-sealed, and after being molded by high-temperature thermoplastic bonding, the tensile force in the pre-sealed area (6) is evenly distributed.
7. The method for preventing edge delamination of a sound insulation pad according to claim 1, characterized in that: In the step S4, the thickness of the pre-sealed edge area (6) is 12-24% of the thickness of the finished sound insulation pad.
8. The method for preventing edge delamination of a sound insulation pad according to claim 7, characterized in that: In step S4, the thickness of the pre-sealed edge area (6) is 18% of the thickness of the finished sound insulation pad.
9. The method for preventing edge delamination of a sound insulation pad according to claim 1, characterized in that: In the step S4, the edge of the sound insulation pad is pre-sealed in a stepped manner.
10. The method for preventing edge delamination of a sound insulation pad according to claim 1, characterized in that: In step S4, the pre-sealed edge area (6) is located at 10 mm to 20 mm from the knife edge.