Automobile Weather Strip Liquid Slip Agent Coating
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Solution Overview
Problem
Conventional automobile weather strips face issues with surface fracture due to high compressive loads, dust contamination from static electricity, and difficulty in controlling multiple extrusions, leading to poor durability and emotional quality.
Innovation Solution
A method involving the application of a liquid-phase slip agent made from silicone and polyurethane to the surface of a thermoplastic elastomer weather strip, combined with pretreatment and curing using infrared or heat, to enhance durability and reduce frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic slip agent is extruded and co-extruded on the surface of the seal part, then durability is improved, but compressive load becomes high causing surface fracture
Solution Approach 1:
The patent changes the physical state of the slip agent from solid (conventional plastic slip agent) to liquid (silicone-based liquid slip agent). This parameter change reduces the compressive load on the surface while maintaining the slip function, thereby preventing surface fracture while improving durability
Solution Approach 2:
The patent utilizes the liquid phase of the silicone-based slip agent instead of the solid phase used in conventional plastic slip agents. This phase transition allows the slip agent to be applied as a coating that cures to form a flexible protective layer, reducing surface fracture risk while maintaining durability
2Reliability
If a super high hardness surface layer is provided, then durability is improved, but permanent deformation increases and multiple extrusion becomes difficult to control
Solution Approach 1:
The patent changes the hardness parameter of the surface layer from super high hardness to moderate hardness by using a cured silicone-based coating. This allows the surface to be durable while remaining flexible enough to control extrusion processes and resist permanent deformation
Solution Approach 2:
The patent applies the slip agent coating and cures it before the extrusion process. This preliminary action creates a prepared surface that guides the extrusion process, making it easier to control and reducing permanent deformation while maintaining durability
3Reliability
If a conventional weather strip is used, then sealing function is provided, but dust contamination from static electricity becomes serious
Solution Approach 1:
The patent changes the surface electrical properties by applying a silicone-based slip agent coating that reduces static electricity generation. This parameter change decreases dust attraction while maintaining the sealing function of the weather strip
Solution Approach 2:
The silicone-based slip agent coating acts as an intermediary layer between the weather strip surface and the environment. This intermediate layer reduces static electricity and dust contamination while allowing the underlying sealing structure to maintain its sealing function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves emotional quality, compression set performance, and durability of the weather strip while preventing dust contamination, meeting standards for long-term load loss and tensile strength.
Implementation Method 1
the pretreatment step (b) is carried out through any one of a primer applying method and an electrical plasma radiation method
Implementation Method 2
the weather strip is cured through any one or combination of infrared (IR) light, near infrared (NIR) light, and heat at a given temperature of 50 to 160°C
Implementation Method 3
the weather strip is cured through any one or combination of infrared (IR) light, near infrared (NIR) light, and heat at a given temperature of 50 to 160°C for a given period of time
Data Source
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AI summary
The present invention relates to a method for manufacturing an automobile weather strip having a seal part having a sectional shape of U and a sealing function, a coupling member formed unitarily with the seal part in such a manner as to be coupled to a flange portion of an automobile, and a seam material insertedly disposed inside the coupling member, the method including: (a) weather strip manufacturing step wherein the seam material and a thermoplastic elastomer are extruded and molded; (b) pretreatment step wherein the surface of the weather strip manufactured is pretreated; (c) slip agent applying step wherein a slip agent made by mixing silicone and polyurethane is applied to the surface of the weather strip pretreated through the pretreatment step; and (d) curing step wherein the slip agent coating layer formed through the slip agent applying step is cured. According to the present invention, the automobile weather strip and the method for manufacturing the same can improve emotional quality, compression set performance, reinforcement, and durability thereof.