Slip tape for automotive weatherstrips

Abstract

The present invention relates to a slip tape for automotive weatherstrips that improves slipperiness while lowering the coefficient of friction and appropriately preventing or minimizing the generation of abnormal noise by forming a ring in the shape of a smooth circular loop on the outer surface, and fundamentally prevents the ring from coming off by knitting so that the loop-shaped ring is attached. The slip tape of the present invention is attached to the outer surface of the door belt weatherstrip and door glass weatherstrip of an automobile and includes a base film made of an olefin resin, an adhesive layer formed by applying an adhesive to the upper surface of the base film, and a ring knitted layer formed by attaching the lower surface to the upper surface of the adhesive layer and being made of multifilament yarn of polyester or nylon material, with a number of upper rings in the shape of a circular loop knitted on the upper surface so as to adhere closely to the outer surface of the automobile glass and protruding upward, and a lower ring knitted flat on the lower surface so as to attach to and support the upper ring.

Description

Technical Field

[0005] ,

[0004] , ,

[0001] The present invention relates to a slip tape for an automotive weatherstrip, and more particularly, by forming a ring in a circular loop shape with a smooth outer surface, it reduces the coefficient of friction, appropriately prevents or minimizes the generation of abnormal noises while improving the slipperiness, and relates to a slip tape for an automotive weatherstrip that is knitted so that a loop-shaped ring is formed thereon to fundamentally prevent the ring from coming off.

Background Art

[0002] Generally, at the part where the door glass of an automobile moves up and down, in order to prevent dust, water, wind, etc. from flowing into the inner space of the door that houses the door glass and to guide the up and down movement of the door glass, as shown in FIGS. 9 to 11, a door belt weatherstrip 2 and a door glass weatherstrip 4 are applied.

[0003] As shown in FIGS. 9 to 11, conventional door belt weatherstrips 2 and door glass weatherstrips 4 include an elastic body 12 fixed to a door trim 6, a door frame 8, a door panel 10, etc., a pressing portion 16 protruding from the elastic body 12 toward the glass 14 side and elastically contacting the glass 14, and a slip tape 18 disposed at the glass 14 contact portion between the pressing portion 16 and the elastic body 12 to prevent wear of the pressing portion 16 and the elastic body 12 and to enable the natural up and down movement of the glass 14.

[0004] Thereby, it is fixed to the vehicle body by the elastic body 12, and the pressing portion 16 contacts both surfaces or the edge surface of the glass 14, so as to prevent dust, water, wind, etc. from flowing into the inner space of the door that houses the door glass 14 and to guide the up and down movement of the door glass 14.

[0005] Here, two types of slip tapes have been proposed: a flocking slip tape manufactured using the flocking method, which is a fiber manufacturing method in which short fiber piles are fixed upright in an adhesive layer using an electrostatic flocking method; and a velvet slip tape in which the flocking surface is replaced with a velvet knit fabric made using a velvet knitting method.

[0006] As shown in Figure 12, this type of flocking slip tape is manufactured by bonding a large number of fiber piles, each cut to a certain length, to the upper surface of a base film with an adhesive. This results in a structure where short fiber piles with rough cut surfaces protrude upright from the upper surface of the base film, and this upright structure comes into contact with the car's glass at a right angle.

[0007] However, the conventional technologies described above had the following problems.

[0008] Conventional slip tapes, whether manufactured using the flocking or velvet method, form a structure in which short fiber piles stand upright on the upper surface of the base film. When the cut ends of the fiber piles come into contact with the glass, during the raising and lowering of the car's glass, the upright fiber piles are suddenly laid horizontally upwards, and then flipped over to the opposite side and pulled down during the lowering of the glass. In this process, the cut ends of the fiber piles are not smooth, increasing the coefficient of friction with the glass. As a result, the fiber piles adhered to the base film come loose from the adhesive layer, reducing durability and abrasion resistance. In addition, abnormal noises (noises) are generated at the friction surface between the fiber piles and the glass.

[0009] In particular, when the slip tape absorbs moisture, such as during rainy weather, there is a very high possibility of the fiber pile detaching and abnormal noises occurring.

[0010] Furthermore, conventional slip tapes have a problem in that the base film is made of an olefin resin layer, resulting in low tensile strength and melting temperature. When the slip tape is supplied during the extrusion molding of weatherstrips, the base film can easily break due to the high extrusion force and high temperature environment. [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the present invention was devised to solve the various problems of the conventional invention as described above, and the object of the present invention is to provide an automotive weatherstrip slip tape that improves slipability while lowering the coefficient of friction and appropriately preventing or minimizing the generation of abnormal noise by forming a ring in the shape of a smooth circular loop on the outer surface, and fundamentally prevents the ring from coming off by weaving so that the loop-shaped ring is attached.

[0012] Another object of the present invention is to provide a slip tape for automotive weatherstrips that smoothly prevents tearing of the base film during the extrusion molding of the weatherstrip by adhering a separate nylon film to the base film. [Means for solving the problem]

[0013] To achieve the above objectives, the "automobile weatherstrip slip tape" according to the present invention is characterized by comprising: a base film made of an olefin resin that is attached to the outer surface of an automobile door belt weatherstrip and door glass weatherstrip; an adhesive layer formed by applying an adhesive to the upper surface of the base film; and a ring knitted layer formed of a multifilament yarn of polyester or nylon material, with its lower surface attached to the upper surface of the adhesive layer, having a number of upper rings in the shape of circular loops knitted on its upper surface to protrude upward so as to adhere closely to the outer surface of the automobile glass, and lower rings knitted flat on its lower surface to support the upper rings.

[0014] Furthermore, the upper ring of the "slip tape for automotive weatherstrips" according to the present invention is characterized by being a knitted sink loop type ring formed by knitting multifilament yarn of polyester or nylon material.

[0015] Furthermore, the ring knitted layer of the "slip tape for automotive weatherstrips" according to the present invention is characterized in that spandex yarn is mixed with the multifilament yarn of polyester or nylon material in a weight ratio of 10% to 30% of the total weight of the multifilament yarn.

[0016] Furthermore, the ring knitted layer of the "slip tape for automotive weatherstrips" according to the present invention is characterized by further including recessed rings formed between the upper rings at irregular intervals so as to form irregular valleys and recessed below the upper rings.

[0017] Furthermore, the ring knitted layer of the "automotive weatherstrip slip tape" according to the present invention is characterized in that it further includes a softening treatment layer formed by impregnating the outer surface of the ring knitted layer with an amino-modified silicone softener emulsion.

[0018] Furthermore, the flexible treatment layer of the "automotive weatherstrip slip tape" according to the present invention is characterized in that the solid content of residual silicone after drying is 1 g to 3 g per square meter.

[0019] Furthermore, the ring knitted layer of the "automotive weatherstrip slip tape" according to the present invention has a thickness of 0.4 mm to 0.6 mm and is manufactured by blending 50 denier to 75 denier DTY yarn with 15 denier to 30 denier spandex yarn in a blending ratio of 10% to 30% by weight.

[0020] Furthermore, the ring knitted layer of the "slip tape for automotive weatherstrips" according to the present invention has a thickness of 0.4 mm to 0.6 mm and is manufactured by blending spandex yarn with a polyester or nylon component 50d / 36fDTY yarn or 50d / 48fDTY yarn in a blending ratio of 10% to 15% by weight.

[0021] In addition, the upper ring of the "slip tape for automotive weatherstrip" according to the present invention is formed at a density of 6,000 to 7,000 per square inch area and has a height of 0.4 mm to 0.6 mm.

[0022] In addition, the base film of the "slip tape for automotive weatherstrip" according to the present invention has an upper and lower thickness of 30 μm to 60 μm, and further includes a nylon film layer formed of a nylon material film adhered to the upper surface of the base film, and the nylon film layer has an upper and lower thickness of 10 μm to 15 μm.

Effect of the Invention

[0023] The present invention as described above forms a circular loop-shaped ring with a smooth outer surface, thereby reducing the coefficient of friction, appropriately preventing or minimizing the generation of abnormal noises, improving the slipperiness, and knitting the loop-shaped ring so that it is applied, thereby fundamentally preventing the ring from coming off. Therefore, the quality of use is significantly improved by noise prevention, and the durability and abrasion resistance are significantly improved by preventing detachment, ensuring a long lifespan.

[0024] In addition, the present invention has the effect of smoothly preventing the base film from being cut during the extrusion molding of the weatherstrip by adhering a separate nylon film to the base film, thereby improving the durability and workability.

Brief Description of the Drawings

[0025] [Figure 1] It is a schematic longitudinal sectional view of the slip tape according to the present invention. [Figure 2] It is a schematic longitudinal sectional view showing the ring knitted layer of the slip tape according to the present invention. [Figure 3] It is an exemplary view showing the upper surface of the knitted state of the ring knitted layer according to the present invention. [Figure 4] It is an exemplary view showing the lower surface of the knitted state of the ring knitted layer according to the present invention. [Figure 5]This is a schematic longitudinal cross-sectional view showing the ring knitted layer of a slip tape according to another embodiment of the present invention. [Figure 6] This is a photograph showing the planar surface of the slip tape according to the embodiment in Figure 5. [Figure 7] This is a photograph showing a cross-section of a weatherstrip with the slip tape according to the example in Figure 5. [Figure 8] This is a schematic longitudinal cross-sectional view showing a slip tape according to yet another embodiment of the present invention. [Figure 9] This is a side view of a vehicle equipped with conventional flocking-type slip tape. [Figure 10] This is a schematic cross-sectional view of line AA in Figure 9. [Figure 11] Figure 9 is a schematic cross-sectional view of the BB line. [Figure 12] This is a photograph showing conventional slip tape. [Modes for carrying out the invention]

[0026] The present invention will be described in more detail below with reference to the accompanying drawings illustrating preferred embodiments. However, it should be understood that the present invention can be embodied in a number of diverse forms and is not limited to the embodiments disclosed.

[0027] Figures 1 to 6 are schematic diagrams and photographs of the slip tape according to the present invention. As shown in these figures, the slip tape for automotive weatherstrips according to the present invention includes a base film 100, an adhesive layer 200 formed by being applied to the upper surface of the base film 100, and a ring knitted layer 300 attached to the adhesive layer 200, with a number of upper rings 301 protruding upward.

[0028] The base film 100 is attached to the outer surface of the door belt weatherstrip and door glass weatherstrip of an automobile, and is made of an olefin resin. It serves to provide a place for heat bonding to the outer surface of the door belt weatherstrip and door glass weatherstrip, as well as a place for adhesive to be applied.

[0029] Typically, when manufacturing weatherstrips by extruding materials such as TPE or EPDM, which are used for automotive weatherstrips, the base film 100 is heat-bonded to the weatherstrip by the heat generated during extrusion. Here, an olefin-based resin is used as the base film 100, which is compatible with materials such as TPE or EPDM and facilitates heat bonding.

[0030] Furthermore, the olefin resin is preferably a copolymer resin of polyethylene or polypropylene.

[0031] The base film 100 is manufactured using a T-die extrusion method, and then a corona discharge surface treatment is performed on one side of the film. This is to ensure that the adhesive layer 200 is applied smoothly later and that the ring knitted layer 300 is properly bonded.

[0032] The base film 100 preferably has a thickness of 30 μm to 60 μm (microns) on its upper and lower sides. This is because if it is thinner than 30 μm, bonding with the ring knitted layer 300 becomes complicated, and if it is too thin, the adhesive strength with the weatherstrip decreases. If it is thicker than 60 μm, the total thickness of the slip tape becomes too thick and rigid, and the adhesive strength to the bent portion formed on the weatherstrip may drop sharply.

[0033] The adhesive layer 200 is formed by applying an adhesive to the upper surface of the base film 100, so that the ring knitted layer 300 can be adhered to the outer surface of the base film 100. The adhesive for such an adhesive layer 200 is preferably a two-component urethane adhesive with good heat resistance.

[0034] The ring knitted layer 300 has its lower surface attached to the upper surface of the adhesive layer 200 and is formed of multifilament yarn of polyester or nylon material. Numerous upper rings 301 in the shape of circular loops are knitted on the upper surface and protrude upward so as to adhere closely to the outer surface of the car's glass, and lower rings 302 are knitted flat on the lower surface to support the upper rings 301. The upper rings 301, which have no cut surfaces and are in the shape of circular loops, reduce the coefficient of friction with the outer surface of the car's glass, thereby preventing the generation of abnormal noise.

[0035] The upper ring 301 is formed in a circular loop shape, thereby reducing frictional force against the outer surface of the car's glass and preventing or minimizing the generation of abnormal noise. The upper ring 301 is made of multifilament yarn, with multiple loops formed on a single yarn.

[0036] The upper ring 301 is formed as a sink-loop type ring of knitted fabric, which is made by knitting multifilament yarn of polyester or nylon material, so that the upper ring 301 is arranged on the upper surface. The sink-loop surface formed by such sink-loop type rings is where the upper ring 301 are densely packed and form the back surface of the knitted fabric, and this form is shown in Figure 3 as a planar representation, for example.

[0037] The upper ring 301 is formed with a density of 6,000 to 7,000 particles per square inch and has a circular loop structure with a height of 0.4 mm to 0.6 mm, thereby providing high density, excellent wear resistance, stable slipability, and low friction.

[0038] The lower ring 302 is formed by knitting the multifilament yarn flat, i.e., flat, and together with the upper ring 301 to form a needle loop ring. It serves to support the upper ring 301 while also providing a portion to be bonded to the adhesive layer 200. The needle loop surface formed by such a needle loop ring is formed by the dense clustering of the lower rings 302, and its form is shown in Figure 4, for example, as a planar representation.

[0039] The ring knitted layer 300, composed of the upper ring 301 and the lower ring 302, is a knitted fabric, and is preferably a flat structure of a weft knitted fabric that is advantageous for forming loop shapes. Such a flat structure of a weft knitted fabric refers to a knitted fabric in which loops are pulled from the back to the front using a set of needles. Such a flat knitted fabric is mainly produced using a circular knitting machine.

[0040] The flat surface of the flat knitted fabric forms needle loops in V-shaped rows, with valleys between the rows (see Figure 4). The reverse side of the flat knitted fabric forms semi-cylindrical sink loops, with these columns forming rows, and valleys between the rows (see Figure 3).

[0041] Preferably, the ring knitted layer 300 is formed by mixing spandex yarn with the multifilament yarn of polyester or nylon material in a weight ratio of 10% to 30% of the total weight of the multifilament yarn. When a knitted fabric with spandex yarn mixed in in this way is manufactured using yarn configured to have great elasticity and is greatly reduced (shrunk), the sink loops bulge upward, and a circular loop shape can be appropriately formed.

[0042] If the spandex yarn is mixed in at a weight of less than 10%, the elasticity decreases sharply, making it difficult to form a circular ring shape. If the spandex yarn is mixed in at a weight of more than 30%, the elasticity becomes too great, making it difficult to adjust the height of the ring shape.

[0043] Here, spandex yarn is a general term for synthetic fibers made from polyurethane fibers, and refers to fiber yarn with excellent elasticity.

[0044] The ring knitted layer 300 preferably has a thickness of 0.4 mm to 0.6 mm. This is because it is the optimal thickness for the slip layer of the weatherstrip.

[0045] Such a ring-knitted layer 300 can be manufactured by blending 50-denier to 75-denier DTY yarn with 15-denier to 30-denier spandex yarn in a blending ratio of 10% to 30% by weight. The ring-knitted layer 300 formed in this way forms a high-density circular ring layer and has high slip properties.

[0046] Furthermore, the ring-knitted layer 300 can be knitted by blending a 50d / 36fDTY yarn or 50d / 48fDTY yarn of polyester or nylon components with spandex yarn in a blending ratio of 10 to 15% by weight. This also forms a high-density circular ring layer, resulting in high slip properties.

[0047] Here, polyester or nylon DTY (Draw Textured Yarn) refers to a twisted multifilament synthetic fiber yarn, 50d / 36f means that 36 monofilament yarns are bundled together to form a thickness of 50 denier, and 50d / 48f means that 48 monofilament yarns are bundled together to form a thickness of 50 denier. Spandex yarn plays a role in adding elasticity and easily forming a circular ring shape, and it is preferable to use a spandex yarn that is thinner than the DTY yarn.

[0048] The slip tape according to the present invention, configured in this manner, is a groundbreaking invention that improves slipperiness while lowering the coefficient of friction and appropriately preventing or minimizing the generation of abnormal noise by forming the upper ring 301 in the shape of a smooth circular loop on its outer surface, and fundamentally prevents the upper ring 301 from detaching by weaving the loop-shaped upper ring 301 over the lower ring 302.

[0049] Figures 5 to 7 are schematic diagrams and photographs showing the ring knitted layer of a slip tape according to another embodiment of the present invention. As shown in the figures, the ring knitted layer 300 of the slip tape for automotive weatherstrips according to another embodiment of the present invention further includes recessed rings 303 formed at irregular intervals between the upper rings 301 and the upper rings 301 so as to form irregular valleys, and recessed below the upper rings 301.

[0050] The recessed ring 303 is formed lower than the upper ring 301 and is irregularly distributed between the upper rings 301, so that valleys are irregularly formed by the continuous arrangement of a large number of the upper rings 301.

[0051] Here, the regular grooves formed by the upper ring 301 provide a consistent contact area with the outer surface of the car's glass, which increases the coefficient of friction.

[0052] In this way, the recessed ring 303 creates irregular grooves formed by the continuous arrangement of the upper rings 301, which relatively lowers the coefficient of friction with the car's glass and improves slip resistance.

[0053] Figure 6 shows a photograph of the upper ring 301 and recessed ring 303 of the ring knitted layer 300 manufactured using this method, and Figure 7 shows a photograph of a cross-section of it attached to a weatherstrip.

[0054] Figure 8 is a schematic longitudinal cross-sectional view showing a slip tape according to yet another embodiment of the present invention. As shown in the figure, the ring knitted layer 300 of the slip tape for automotive weatherstrips according to yet another embodiment of the present invention further includes a softening layer 304 formed by impregnating its outer surface with an amino-modified silicone softener emulsion.

[0055] The flexible treatment layer 304 makes the upper ring 301 of the ring knitted layer 300 more flexible, thereby improving slipperiness while maintaining a lower coefficient of friction.

[0056] Preferably, the residual silicone solid content of the flexible treatment layer 304 after drying is 1 g to 3 g per square meter. This is because if the residual solid content is less than 1 g, the improvement in slipperiness is minimal, and if it is more than 3 g, the silicone solids will separate and adhere to the glass surface of the automobile.

[0057] Experimentally calculated results show that the coefficient of friction between the surface of conventional slip tape formed by a general flocking method and the glass surface of an automobile is 0.32 to 0.38 (at room temperature and 40% to 50% humidity). The coefficient of friction of the slip tape according to the present invention is 0.21 to 0.30, indicating improved slipperiness. Furthermore, in other embodiments of the present invention, the recessed rings are arranged irregularly to suppress the formation of regular valleys, and the slip tape treated with an amino-modified silicone softener has a coefficient of friction measured at 0.18 to 0.26, confirming a further improvement in slipperiness.

[0058] The base film 100 of the slip tape of the present invention further includes a nylon film layer 101, which is adhered to its upper surface and is formed of a nylon film. The nylon film layer 101 serves to prevent the base film 100 from tearing due to high temperature and pressure during the extrusion molding of the weatherstrip.

[0059] The nylon film layer 101 is preferably made with a thickness of 10 μm to 15 μm. This is because if the nylon film layer 101 is thinner than 10 μm, its durability will be too low, making it impossible to properly prevent the base film 100 from tearing, and if it is thicker than 15 μm, it may be made unnecessarily thick, causing the base film 100 to become excessively thick overall.

[0060] While preferred embodiments of the present invention have been described above, the present invention can be adapted to a wide range of variations, modifications, and equivalents. It is clear that the present invention can be adapted to the above embodiments and applied in an equivalent manner. Therefore, the above disclosure does not limit the scope of the present invention as determined by the following claims.

[0061] On the other hand, while specific examples have been described in the detailed description of the present invention, it is obvious to those with ordinary skill in the art that various modifications are possible without departing from the scope of the present invention.

Claims

1. A base film (100) made of an olefin resin is attached to the outer surface of the door belt weatherstrip and door glass weatherstrip of an automobile, An adhesive layer (200) is formed by applying an adhesive to the upper surface of the base film (100), The lower surface is attached to the upper surface of the adhesive layer (200), and the ring knitted layer (300) is formed from multifilament yarn of polyester or nylon material, with a number of upper rings (301) in the shape of circular loops knitted on the upper surface and protruding upward so as to adhere closely to the outer surface of the car glass, and the lower rings (302) are knitted flat on the lower surface so as to support the upper rings (301), A slip tape for automotive weatherstrips, characterized by containing the following:

2. The slip tape for automotive weatherstrips according to claim 1, characterized in that the upper ring (301) is a knitted sink loop type ring formed by knitting multifilament yarn of polyester or nylon material.

3. The slip tape for automotive weatherstrips according to claim 1, characterized in that the ring knitted layer (300) is formed by mixing spandex yarn with the multifilament yarn of polyester or nylon material in a weight ratio of 10% to 30% of the total weight of the multifilament yarn.

4. The slip tape for automotive weatherstrips according to claim 1, wherein the ring knitted layer (300) further includes recessed rings (303) formed at irregular intervals between the upper rings (301) so as to form irregular valleys and recessed below the upper rings (301).

5. The slip tape for automotive weatherstrips according to claim 1, characterized in that the ring knitted layer (300) further comprises a softening treatment layer (304) formed by impregnating the outer surface of the ring knitted layer (300) with an amino-modified silicone softener emulsion.

6. The slip tape for automotive weatherstrips according to claim 5, characterized in that the flexible treatment layer (304) has a residual silicone solid content of 1 g to 3 g per square meter after drying.

7. The slip tape for automotive weatherstrips according to claim 1, characterized in that the ring knitted layer (300) has a vertical thickness of 0.4 mm to 0.6 mm and is manufactured by mixing 50 denier to 75 denier DTY yarn with 15 denier to 30 denier spandex yarn in a mixing ratio of 10% to 30% by weight.

8. The slip tape for automotive weatherstrips according to claim 1, characterized in that the ring knitted layer (300) has a vertical thickness of 0.4 mm to 0.6 mm and is manufactured by blending spandex yarn with a polyester or nylon component 50d / 36fDTY yarn or 50d / 48fDTY yarn in a blending ratio of 10% to 15% by weight.

9. The slip tape for automotive weatherstrips according to claim 1, characterized in that the upper ring (301) is formed at a density of 6,000 to 7,000 per square inch and has a height of 0.4 mm to 0.6 mm.

10. The base film (100) has a vertical thickness of 30 μm to 60 μm and further includes a nylon film layer (101) formed of a nylon material film, which is adhered to the upper surface of the base film (100). The slip tape for automotive weatherstrips according to claim 1, characterized in that the nylon film layer (101) has a thickness of 10 μm to 15 μm.

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