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Recently, one of major problems in automotive industry is squeak noise between two different materials. It is the most severe case that the noise between automobile seat and other relative parts (or within seat parts). Especially, seat covering is generated to unfavorable sound by friction of other parts. The purpose of this research is to verify and suggest a way to reduce squeak noise between seat covering and plastic at relative parts. Test results were reported with 1 to 10 Risk Priority Number (RPN) which was proposed by VDA (Verband der Automotilindustrie). It was conducted as a test with two different types of seat trim cover (knit) and plastics (PC+ABS) applied at arm rest in automotive interior. Through the principle test, the knit were more advantageous for squeak noise than other fabrics around relative part of seat particularly with suede, tricot and PC+ABS. We also optimized the concentration of soft agent in knit for slipping through stick-slip test to moderate noise.

Recently, it is one of a major problems in automotive industry that wrinkles on seat interior occur at detaching between seat covering and padding foam. The purpose of this research is the way to improve heat resistance and adhesion using polyurethane reactive (PUR) of thermosetting plastic material. We compose PUR that makes thin film and non-tacky characteristic on padding foam. We find optimum situation (method and amount) for leather and padding foam. Viscosity and melting temperature are adjusted to coat with amount. 25~30g/m2 are suitable on padding foam unlike traditional method to coat leather above 100g/ m2. We also verified performances of PUR lamination compared to others. As result, peel strength is strongest at 15.4N/30mm. Heat resistance is also excellent with various padding foams. Furthermore we advance an additional jig to match leather and padding foam by low tacky characteristic of PUR. This jig can increase productivity in seat manufacturing process.

Recently, it is one of the major problems in the automotive industry that grating is occurred form the place that more than two different materials combined. It is the most severe case that the noise generates between automobile seats and other relative parts (or within seat parts). The purpose of this research verifies and suggests the way to reduce squeak noise between two different parts through the stick-slip test which is regulated by VDA. The two materials - the seat trim cover and the plastic - were selected as major factors. We conducted the test with two different types of seat trim cover (authentic and artificial leather) and plastics (PP and ABS) with 4 levels of embossing size (0 to 3, level ‘0’ is non-embossing. Level 1 is the biggest embossing and it goes through smaller. Level 3 is the smallest embossing size). Test results were reported with 1 to 10 Risk Priority Number (RPN) which was proposed by VDA (Verband der Automotilindustrie).

Seat covering problem is the No.1 Fail-course of seat entry and exit durability test. Seat ingress and egress durability test takes about 100 hours of test time and test samples to be used as a seat module. This paper is drawn the test method which can be reproduced and verified the result of seat ingress and egress durability test about Seat covering by using flat friction test. This test method can reduce test time because to conduct an accelerated test. Using a covering material to the test sample instead of seat module so can save the cost.