JP4201266B2 - Method for producing weather strip for vehicle without flocking - Google Patents

Description

【００２６】
【表２】

【００２７】
【表３】

【００２８】
表２に示した試験結果は、下記の試験方法によって得られたものである。
（Ａ）摩擦係数の測定は、摩擦試験機（新東科学社、ヘイドン１４−Ｄ−ＡＮＬ型）を用いて行った。
１）製品から切り出した長さ５０ｍｍの試験片を測定に使用した。
２）試験荷重は２００ｇとした。
３）試験スピード（引取り速度）を１００ｍｍ／分として測定した。
（Ｂ）摩耗耐久性の評価は、グラスランチャンネル品のリップの摩耗試験法として提案されている簡易摩耗試験法で行った。
１）製品から切り取った長さ２００ｍｍの試験片を使用した。
２）試験荷重は３０００ｇ/５ｃｍ角の摩擦子に対応する。
３）試験スピードについては、６０ないし６６回／分の範囲で変化させた周期で水平方向に１４０ｍｍの移動距離で摩擦子を往復摺動させた。
【００２９】
耐久性は、５００回、１０００回、２０００回、５０００回、１００００回の往復摺動後の凹凸形状の摩耗状態によって下記3段階の基準で評価した。
Ａ： 摩耗が認められない。
Ｂ： わずかな摩耗が認められる。
Ｃ： 摩耗が明らかに認められる。
（Ｃ）ガラス面傷付き性の評価は、自動車メーカーで採用されている耐摩耗試験方法に従い、上記の摩耗耐久試験を行う際に、粒径２０ないし３０μｍのけい砂粒子と粒径１８５ないし２００μｍのけい砂粒子をリップ表層部と試験面の間に噛み込ませ、１０００回の往復摺動後に傷付き状態を下記３段階の基準で記録した。
Ａ： 傷が認められない。
Ｂ： わずかな傷が認められる。
Ｃ： 明らかに傷が認められる。
【００３０】
（Ｄ）ゴミ取り性は、摩擦試験機（新東科学社、ヘイドン１４−Ｄ−ＡＮＬ型）を用いて行った測定の結果によって下記３段階の基準で評価した。
１）製品から切り取った長さ５０ｍｍの試験片を使用した。
２）試験荷重を、１００ｇ、２００ｇ、３００ｇの３段階として測定した。
３）試験スピードは１００ｍｍ／分とした。
４）粒径２０ないし３０μｍおよび粒径１８５ないし２００μｍの2種類のけい砂粒子を使用し、リップの１回の運動でけい砂粒子がリップ部に引き込まれる度合いによってゴミ取り性を評価した。
Ａ： 砂粒の引き込みが認められない。
Ｂ： わずかながら砂粒の引き込みが認められる。
Ｃ： 砂粒の引き込みが明らかに認められる。
【００３１】
（Ｅ）シール性（水切り性）は、摩擦試験機（新東科学社、ヘイドン１４−Ｄ−ＡＮＬ型）を用いる測定の結果によって下記３段階の基準で評価した。
１）製品から切り取った長さ５０ｍｍの試験片を使用した。
２）試験荷重は、１００ｇ、２００ｇ、３００ｇの３段階とした。
３）試験スピードは１００ｍｍ／分とした。
４）０．３ミリリットルの水をガラス面の上に滴下し、リップ部を１回だけ移動させたときのリップ部による水滴の拭き取り状態によって評価した。
Ａ： 水滴の拭き取り状態が良好。
Ｂ： わずかな拭き取り残しの水がある。
Ｃ： 顕著に拭き取り残しの水がある。
【００３２】
表２および表３から以下の結論が得られる。すなわち、
１）表２からわかるように、リップ表層部の凹凸形状の１０点平均粗さ（Ｒｚ）が３００μｍ未満であると所望の製品性能がほとんど期待されず、他方、Ｒｚが５００μｍを超えると、耐摩耗性やガラス面キズ付性は満足されるものの、ゴミ取り性やシール性が劣るようになる。Ｒｚが３００μｍ以上、５００μｍ以下でないとすべての試験項目について製品に要求される性能を満足しない。
２）表３からわかるように、ダイ・ディメンジョンにおけるＬ／ｔの値と凹凸形状の関係については、架橋粒子の含有率の異なる２種類の表層部形成材料組成物を用いて３００μｍ以上のＲｚ値が得られるＬ／ｔの値は１００ないし１５０であり、Ｌ／ｔの値が２５０では山頂部が潰れて鋭くとがった形状の突起が得られない。
【産業上の利用可能性】
【００３３】
本発明は植毛のない車両用ウェザーストリップの製造方法に関するものであって、植毛加工のような複雑煩雑で高コストの工程を必要とせずに植毛タイプのウェザーストリップと同等の性能、たとえば摺動性、ゴミ取り性、低ガラス面傷付き性、摩耗耐久性、柔軟性、シール性をを発揮するウェザーストリップが提供される。しかも、成形性に優れた熱可塑性樹脂組成物または熱可塑性エラストマー組成物を使用して効率よく製造できるので、自動車などに使用される高性能で安価なウェザーストリップ、特には植毛のない窓ガラス外面用ウェザーストリップが提供されるので、本発明の産業上の有用性は大きい。
【図面の簡単な説明】
【００３４】
【図１】 本発明による植毛なしのウェザーストリップの模式的断面図である。
【図２】 第１図と同じ本発明によるウェザーストリップをドア窓ガラスに取り付けた状態を示す説明図である。
【図３】 本発明による植毛なしのウェザーストリップを製造する場合に使用される二色ダイを示す模式図で、（ａ）は二色押出成形ダイの、押出軸に垂直な模式的部分断面図であり、（ｂ）は二色押出成形ダイの、押出軸を含む面で表した模式的断面図である。
【図４】 従来の植毛タイプのウェザーストリップの模式的断面図である。
【符号の説明】
【００３５】
１：ウェザーストリップ
２：芯材
３：（ウェザーストリップ１の）本体部
４：リップ部
５：（ナイロン）パイル
６：リップ表層部
７：（車両のドア）窓ガラス [TechnologyOperationfield】
[0001]
  The present invention relates to a weather strip that is used in contact with a window glass that is fitted in a door of a vehicle such as an automobile and opened and closed. In particular, weatherstripping without flocking piles for exterior facing door windows.In the manufacturing methodRelated.
[BackScenic artSkill]
[0002]
SelfA weather strip is attached around the window glass that is fitted in the door of a vehicle such as a moving vehicle to prevent rainwater, dust, sand particles, etc. from being drawn in when the window glass is slid and opened. There are many cases.
  Conventionally used weatherstrip products for vehicles, as shown in an example of a cross-sectional view in FIG. 4, a main body part 3 having a core material 2 made of a metal material such as stainless steel and a lip part 4 are made of soft vinyl chloride. An elastic polymer material such as a resin composition or a vulcanized type EPDM rubber is integrally formed by an extrusion molding method, and an adhesive is used on the surface of the lip portion 4 that contacts the window glass. It has a structure in which the pile 5 is electrostatically flocked. With this configuration, the weather strip 1 exhibits performance such as slidability, dust removal, glass surface scratch resistance, wear durability, and flexibility.The
[0003]
WeThe lip portion 4 of the zerstrip 1 is pressed against the glass surface by utilizing the elasticity of the material to prevent foreign substances such as rainwater and sand particles from entering. However, particularly on the outer side, foreign matters such as sand particles blown off by the wind may remain sandwiched between the window glass and the lip portion 4 of the weather strip 1, and the glass surface is likely to be damaged. The glass surface is scratched because the foreign matter stays in one place on the lip portion and repeatedly rubs the glass surface. Once the foreign matter is sandwiched between the glass surface and the weather strip, the lip portion 4 If it moves sequentially along the space of the recesses and is discharged out of the lip part 4, the extent of damaging the glass surface should be reduced.
  A pile 5 such as a nylon single fiber to be planted in the lip portion 4 of the weather strip 1 can move the sandwiched foreign matters sequentially in one direction if the thickness and flexibility of the single fiber are appropriately selected. Since it can be removed from the lip without being limited to one place on the lip,The
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
[0004]
ShiHowever, the flocking process for filing piles such as nylon monofilament has many processes such as primer application, drying, adhesive application, electrostatic load of pile fiber, pile flocking, drying. In addition to being cumbersome to include, there are problems such as scattering of nylon single fibers, products and equipment due to primers and adhesives, environmental pollution and difficulty in recycling, simplifying the process and improving product yield Is desired. As a countermeasure, development of a weatherstrip that does not require pile flocking is desired.The
[0005]
NaA product intended to replace weathered strips with Iron flocking, kneading rubber or resin particles into the molding material to form an uneven shape on the surface of the lip, or pre-kneading two types of thermoplastic resins with different melting points A weather strip without flocking, which is manufactured by a method such as extrusion molding to form a concavo-convex shape on the surface, has been put on the market. However, all of these products have a surface roughness due to unevenness of only 100 μm or less, and the shape of the unevenness is not necessarily appropriate, so the dust removal performance required for the weather strip for the door outer surface, and scratches on the low glass surface It cannot be said that it has excellent properties and sealing properties. Therefore, the use of such weatherstrip products is limited to the use of weatherstrips for the interior surfaces of doors that do not require such high performance. Under these circumstances, there is a demand for the development of products that have low sliding resistance without flocking, and that are superior in dust removal, glass surface scratch resistance, and sealability as much as or better than pile flocked products.It was.
[0006]
ShiTherefore, the object of the present invention does not require a complicated and complicated process such as flocking processing, and furthermore, sliding property equivalent to the product by flocking, dust removal, low and low glass surface scratch resistance, Plants used in vehicles such as automobiles, which can be formed of a thermoplastic resin composition or a thermoplastic elastomer composition having wear durability, flexibility, sealing properties and excellent moldability.Wee without hairWeather strips, especially weather strips for non-flocked door exteriorsManufacturing methodTo provideThe
[Means for Solving the Problems]
[0007]
BookinventionThe vehicle weave without flockingSaastriThe manufacturing method of, Body part attached to the vehicle, and lip part that contacts the door window glassIs a weather strip for a vehicle without flocking, in which a lip surface layer portion made of a thermoplastic resin composition or a thermoplastic elastomer composition is formed on the surface of the lip portion that comes into contact with the glass surface, The surface of the surface layer portion has a concavo-convex shape with a 10-point average surface roughness Rz of 300 to 500 μm, and the concavo-convex shape is in a valley portion in the measurement range of the virtual plane at a level 0.6 Rz below the peak line. A vehicle without flocking in which the ratio Sz / So of the area Sz of the facing portion to the total area So of the measurement range is 0.4 or more, and the coefficient of dynamic friction with respect to the glass surface of the surface of the lip surface does not exceed 0.35 In the method of manufacturing a weatherstrip for use,The first molding composition for forming the main body portion and the lip portion is supplied to one extrusion molding machine, and the second molding composition for forming the lip surface layer portion is supplied to the second extrusion molding machine to perform coextrusion molding. Two-color coextrusion molding by the method2The shape of the color extrusion die is the die land length L and the thickness of the lip surface layer.with tThe ratio L / t is a shape in the range of 20 to 200.The
【The invention's effect】
[0008]
BookMethod of manufacturing a weather strip for a vehicle without flocking according to the inventionAccording to the prior art,IroSuch asIrregularity can be easily imparted by multicolor extrusion without planting the il, and performance comparable to the planted product can be obtained, simplifying the manufacturing process and eliminating nylon fiber scattering and adhesive contamination, The working environment has been greatly improvedThe
BEST MODE FOR CARRYING OUT THE INVENTION
[0009]
BookIn the invention, when the surface roughness of the lip surface layer portion provided on the surface of the lip portion of the weatherstrip is within a specific range, and there are many independent convex portions constituting the irregularities, it is between the glass surface. Based on the knowledge that the drawn foreign matter gradually moves along the concave portion surrounding the convex portion and is removed outside the lip portion, the concave and convex shape is required.The conditionsAs a result of earnest research on the manufacturing method to realize, it has been completed.
  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
  In the present inventionObtained byPlantingWee without hairAs shown in the schematic cross-sectional view of FIG. 1, the structure of the weather strip is composed of the main body portion 3 and the lip portion 4 of the weather strip 1 having the core material 2, which is different from the conventional product shown in FIG. There is no fundamental difference. Main departureWe obtained by MingThe zerstrip is characterized by forming a lip surface layer portion 6 having specific properties in contact with the glass surface, instead of flocking the conventional nylon pile 5. As shown in FIG. 2, the weather strip 1 is attached along the lip portions 4 on both the inside and outside of the window glass 7, particularly the door window glass 7 of the vehicle.
[0010]
  The material of the core material 2, the main body part 3, and the lip part 4 of the weatherstrip 1 may be any conventionally used material, and there is no particular limitation.
  The material of the core material 2 is the design standard of each vehicle manufacturer and the size of the vehicle.SaAny synthetic resin composition selected in consideration of the type and reinforced with a metal material such as stainless steel, fiber, or talc may be used. In consideration of the fact that it becomes more difficult to recycle if different materials are mixed, the core material 2 can be made of a single kind of resin composition without using a metal material.
  The material of the body portion 3 and the lip portion 4 of the weather strip 1 may be any of a thermoplastic resin composition such as a soft polyvinyl chloride resin composition and a thermoplastic elastomer composition, but the core material 2 is made of a synthetic resin. In some cases, it is more preferable to select a material having compatibility therewith in that integrated recycling is possible.
[0011]
  The concavo-convex shape forming material constituting the lip surface layer portion 6 needs to be a material that can be co-extruded with the lip portion 4, and is preferably a material having good slidability with the glass surface.
  The uneven shape of the surface of the lip surface layer 6 is drawn into the lip 4WaterAnd a function of holding foreign matter such as dust and the like and a function of discharging foreign matter such as water and dust to the outside by utilizing deformation and vibration of the lip portion 4 accompanying opening and closing of the window glass.
  In the conventional flocking process of nylon flocking weatherstrip, a nylon single fiber having a flocking length of 500 μm to 800 μm is electrostatically charged and sucked by electrostatic attraction so as to pierce the adhesive layer applied to the lip surface. The Therefore, the effective fluff length of the pile planted is 300 μm to 600 μm. However, when the implanted nylon pile is pressed against the door window glass with a predetermined load, the pile is pushed down, so that the apparent pile length is further reduced.
[0012]
  The sealing performance of the flocked type weather strip and the performance of preventing foreign particles such as dust particles from being drawn in depend on the effective length of the pile and the degree of collapse. In other words, the performance of a flocked-type weatherstrip is not determined by the pile length as it is planted, but the apparent fluff length depending on the set conditions mounted on the vehicle, dust removal and window glass damage Performance evaluation such as sealing performance is affected. A typical set load is 300 g to a maximum of 500 g per 100 mm length of one lip, and the deformation due to the set load is 250 μm to 320 μm, which is about 35% of the pile length before setting. It corresponds to 50%.
  Therefore, a weather strip having the same performance as a flocking type weather strip.That you can getIn the present invention,Wee without hairThe roughness of the surface of the lip surface layer portion 6 provided on the lip portion 4 of the zerstrip is expressed as a 10-point average roughness (Rz) in the range of 300 μm to 500 μm, preferably in the range of 300 μm to 400 μm. This ensures the same level of dust removal performance, glass surface scratch resistance, and sealing performance as or better than nylon pile flocking products.The
[0013]
ConcaveWhen the roughness Rz of the convex shape exceeds 500 μm, the drainage performance is inferior and the result of the abrasion resistance test required by the exterior parts standard of each vehicle manufacturer, that is, test sand (with an average particle size of 30 to 200 μm). The requirement that sand particles having a particle size of 180 to 200 μm, which is considered to be particularly inconvenient among (silica sand), should not be drawn.
  On the other hand, when the roughness Rz of the concavo-convex shape is smaller than 300 μm, the glass surface is likely to be scratched in the evaluation test of the scratching property of the glass surface by repeatedly opening and closing the window glass in a state in which the test sand particles are drawn, that is, drawn. It tends to be difficult to move test sand particles sequentially and remove them from the lip.The
[0014]
PlantingThe coefficient of friction with respect to the glass surface of the lip surface layer portion 6 of the weather strip having no hair is one of the important factors affecting the opening / closing performance of the window glass. That is, when the friction coefficient is large, a large starting torque is required for a window motor (not shown) that drives opening and closing of the window glass, resulting in a disadvantage that the motor becomes large and heavy. In this case, it is important not to increase the apparent static friction coefficient due to adhesion or adhesion between the glass surface and the lip surface layer.
  Although the dynamic friction coefficient is often defined in the standard of this type of component, it is preferable that the difference between the static friction coefficient and the dynamic friction coefficient is small. To ensure slidability comparable to nylon pile flocksIsIt is important that the coefficient of dynamic friction with respect to the lath surface is 0.35 or less, preferably 0.30 or less.The
[0015]
ReAbout the uneven shape on the surface of the surfaceIsIn order to reduce the dynamic resistance, it is important to make the contact area with the glass surface as small as possible. Sliding resistance is reduced by making the shape of the protrusions and recesses of irregularities indeterminate than hemispherical and making the contact between the protrusions and the glass surface point contact, in addition to dust removal, glass surface scratches It is also advantageous in terms of sex.
  In this regard, it is preferable that the uneven shape on the surface satisfies the following conditions. That is, the area (Sz) of the portion facing the valley in a certain measurement range and the total area of the measurement range (Sz) of the virtual plane at a depth of 0.6 Rz from the peak line of the roughness (Rz) of the concavo-convex shape ( It is desirable that the area ratio (A = Sz / So) with respect to So) is 0.4 or more.Yes.
[0016]
AIf the value is less than 0.4, the ability to hold large dust particles and foreign particles having a particle diameter of 180 μm to 200 μm is insufficient, and the glass surface scratchability and dust foreign matter removal properties are poor.
  Furthermore, if the shape of each mountain that forms the unevenness is a spline or mountain range, the discharge performance of foreign particles is inferior.And laA shape having a mountain-shaped protrusion isolated in a random manner is preferable.
  In the present invention, the 10-point average roughness (Rz), the cross-sectional area (Sz) within a certain measurement range of the cross section from the peak line of Rz to the valley depth 0.6Rz, the total cross-sectional area (So) of the measurement range ), The cross-sectional area (Sa) of the mountain when cut along the Rz peak line, and the valley depth from the Rz peak line0.6For the cross-sectional area (Sm) of the peak height when cut at the level of Rz, for example, a value obtained by measurement processing with a confocal laser microscope such as VK8500 manufactured by Keyence Corporation may be adopted.Yes.
[0017]
DoThe force required to open and close the window glass depends on the area where the concavo-convex surface of the lip surface layer portion 6 is in contact with the glass surface and the friction coefficient with respect to the glass surface of the material constituting the concavo-convex surface in contact with the glass surface. Therefore, it is advantageous to reduce the contact area of the concavo-convex shape in contact with the glass surface of the lip surface layer portion as a sharp protrusion. In this case, it is preferable that the molding material for forming the irregular shape on the surface of the lip surface layer portion 6 is a composition containing irregularly shaped particles that are not melted or deformed by an extrusion molding temperature or pressure. It is preferable that the irregular-shaped particles have a size of 300 μm or more, have a weldability with the matrix polymer of the molding material composition, and do not fall off from the matrix due to shear stress. Examples of such materials include crosslinked particles of thermoplastic resins and thermoplastic elastomers, particulate pulverized products of thermoplastic resins, or thermosetting resins.Crushed grainsChild can be usedThe
[0018]
ThisThese particulate materials are pre-kneaded with a thermoplastic resin or thermoplastic elastomer to be a binder using a kneader, and the resulting mixture is heated as a molding material for the body portion 3 and the lip portion 4 of the weather strip 1. A lip surface layer portion 6 having a required concavo-convex shape is formed on the surface of the lip portion 4 by co-extrusion molding with a plastic resin or a thermoplastic elastomer.
  The body portion 3 and the lip portion 4 of the weather strip 1 are formed of a soft polyvinyl chloride resin composition or a thermoplastic elastomer composition based on a polyolefin-based or polystyrene-based thermoplastic elastomer. On the other hand, the lip surface layer portion 6 that contacts the window glass surface is preferably formed of a thermoplastic elastomer molding material composition having good slidability, but in order to impart a desired uneven shape to the surface of the formed surface layer portion 6. In the molding material composition, cross-linked particles having good slidability are blended. At the same time, a desired uneven shape can be imparted to the lip surface layer portion 6 by co-extrusion molding using a two-color co-extrusion die having a specific die dimension.The
[0019]
PlaceThe overall structure of the two-color or multi-color extrusion die required for forming the desired uneven shape is the same as the basic structure and the structure of a molding die for profile extrusion of a normal thermoplastic resin or thermoplastic elastomer. Is not different. However, in addition to containing a large amount of cross-linked particles that do not melt at the molding temperature, the uneven shape forming material is slidable with the die wall surface even at a temperature at which the matrix polymer component is in a molten state. Whereas the dimension ratio L / t of a molding die for a typical thermoplastic resin or thermoplastic elastomer composition is 5 to 30, it is preferable to use a die having a large value.Yes.
[0020]
BookIn the die for two-color extrusion molding of the forming material of the lip portion surface layer portion 6 in the weather strip of the invention, the condition that the ratio L / t of the die land length (L) to the thickness (t) through which the surface layer portion forming material flows is less than 20 If the molding is performed with, the uneven shape becomes too fine and the desired uneven shape cannot be obtained, so that the effects of dust removal, abrasion resistance, and low glass surface scratch resistance of the weather strip cannot be sufficiently obtained. Also, if the value of L / t exceeds 200, an uneven shape with a desired roughness can be obtained, but the tip of the protrusion is crushed and does not become a protrusion-like uneven shape with a sharp tip.ToThe picking and sealing properties will deteriorate. In order to obtain excellent performance, the L / t ratio of the die dimension needs to be 20 to 200, and preferably L / t is 50 to 150.
[0021]
BookPlanting according to the inventionCar without hairFIGS. 3 (a) and 3 (b) show the main part of a two-color extrusion die used for the manufacture of a dual-purpose weatherstrip. FIG. 3 (a) is a schematic partial sectional view of the two-color extrusion die perpendicular to the extrusion axis, and FIG. 3 (b) shows a section of the two-color extrusion die including the extrusion shaft. FIG.
  In FIG. 3 (b), the lip portion of the weather strip is extruded from the right side to the left side along the arrow I, and a molding composition for forming the lip surface layer portion from the upper side along the arrow II is formed on the way. Supplied and co-extruded. In FIG. 3 (b), t indicates the thickness of the lip surface layer 6, and L indicates the die land length.The
【Example】
[0022]
[ActualExamples and comparisonExample]
  Although not shown, it should be understood that two extruders were used for two-color extrusion. In this embodiment, the main body portion and the lip portion of the weather strip are extruded along the arrow II in FIG. 3B by a first single-screw extruder having a 30 mm diameter screw, and a die for two-color extrusion molding (land length) In the middle of L), the material for forming the lip surface layer portion is formed under the conditions shown in Table 1 using a second single-screw extruder having a 20 mm diameter screw so that the surface layer portion 6 having a thickness t is formed on the surface of the lip portion 4. Extrusion was performed along the arrow I in FIG. Olefin-based thermoplastic elastomer (trade name: TSE-7650, manufactured by Shin-Etsu Polymer Co., Ltd.) is used as the material for the body portion 3 and the lip portion 4 of the weather strip, and 30% by weight is used as the material for the lip surface layer portion 6 in the examples. Using an olefinic thermoplastic elastomer composition (trade name of Shin-Etsu Polymer Co., Ltd .: TSE-4605X) containing particlesIt was.
[0023]
DaA two-color co-extruded product for simulation test was molded using an extrusion die having an L / t value of 125 in a dimension. About the lip surface layer at this time, the appearance of the uneven shape, the slidability (static friction coefficient and dynamic friction coefficient with respect to the glass surface), dust removal, wear resistance, scratch resistance on the glass surface, and sealability evaluation (load 200 g) The results are shown in Table 2. In Comparative Examples 1 and 2 shown in the table, the material for forming the lip surface layer portion is the same as TSE-7650 or the body portion, respectively.60% by massExcept for the olefinic thermoplastic elastomer composition (trade name of Shin-Etsu Polymer Co., Ltd .: TSE-4602X) containing the crosslinked particles, a product prepared under the same molding conditions as in the examples was used as a test specimen. As a reference example, the table shows the test results of a conventional weatherpile of nylon pile type.It was.
[0024]
GaSince it was predicted that the scratch surface scratchability was strongly related to the Rz value of the concavo-convex shape, the TSE-4605X or TSE-4602X described above was used as the surface layer forming material in the evaluation, and the rotational speed of the 20 mm extruder was used. A lip portion having a surface layer thickness t of 0.40 mm was simply formed using four types of dies having a die dimension ratio L / t of 15, 100, 150 and 250 under the same conditions as in the example except that the rotation speed was 30 rpm. Extruded with a layer lip die. With respect to the lip surface layer portion at this time, the appearance evaluation of the concavo-convex shape was visually performed, and the result and the value of Rz are shown in Table 3. In the same table, A of the result of visual evaluation of the shape of the protrusion was a good shape, and B represents that the peak was a slightly bad shape.The
[0025]
[Table 1]

[0026]
[Table 2]

[0027]
[Table 3]

[0028]
tableThe test results shown in 2 were obtained by the following test method.
(A) The friction coefficient was measured using a friction tester (Shinto Kagakusha, Haydon 14-D-ANL type).
1) A test piece having a length of 50 mm cut out from the product was used for measurement.
2) The test load was 200 g.
3) The test speed (take-off speed) was measured at 100 mm / min.
(B) The wear durability was evaluated by a simple wear test method proposed as a lip wear test method for glass run channel products.
1) A test piece having a length of 200 mm cut from the product was used.
2) The test load corresponds to a 3000 g / 5 cm square friction element.
3) As for the test speed, the friction element is slid back and forth at a moving distance of 140 mm in the horizontal direction at a cycle changed in the range of 60 to 66 times / minute.It was.
[0029]
ResistanceThe durability was evaluated according to the following three-stage criteria according to the wear state of the concavo-convex shape after 500, 1000, 2000, 5000, and 10,000 reciprocating slides.
A: No wear is observed.
B: Slight wear is observed.
C: Wear is clearly observed.
(C) Glass surface scratch resistance is evaluated according to the abrasion resistance test method adopted by automobile manufacturers, when the above-mentioned wear durability test is performed, silica sand particles having a particle diameter of 20 to 30 μm and particle diameters of 185 to 200 μm. Silica sand particles were caught between the lip surface layer portion and the test surface, and the scratched state was recorded on the basis of the following three steps after 1000 reciprocating slides.
A: No scratches are observed.
B: Slight scratches are observed.
C: Clearly scratchedThe
[0030]
(D)The dust removal property was evaluated according to the following three-stage criteria based on the results of measurements performed using a friction tester (Shinto Kagakusha, Haydon 14-D-ANL type).
1) A test piece having a length of 50 mm cut out from the product was used.
2) The test load was measured as three stages of 100 g, 200 g, and 300 g.
3) The test speed was 100 mm / min.
4) Two types of silica sand particles having a particle diameter of 20 to 30 μm and a particle diameter of 185 to 200 μm were used, and dust removal performance was evaluated by the degree of the silica sand particles being drawn into the lip portion by one movement of the lip.
A: No sand particles are drawn.
B: A slight amount of sand particles is observed.
C: Sand particles are clearly drawnThe
[0031]
(E)Sealability (drainage) was evaluated according to the following three-stage criteria based on the results of measurement using a friction tester (Shinto Kagakusha, Haydon 14-D-ANL type).
1) A test piece having a length of 50 mm cut out from the product was used.
2) The test load was set in three stages of 100 g, 200 g, and 300 g.
3) The test speed was 100 mm / min.
4) 0.3 ml of water was dropped on the glass surface, and the lip portion was moved only once and evaluated by wiping off water droplets by the lip portion.
A: The state of wiping off water droplets is good.
B: There is a little water left unwiped.
C: There is noticeable water left by wipingThe
[0032]
tableThe following conclusions can be drawn from Table 2 and Table 3. That is,
1) As can be seen from Table 2, almost no desired product performance is expected when the 10-point average roughness (Rz) of the concavo-convex shape of the lip surface layer portion is less than 300 μm, and on the other hand, when Rz exceeds 500 μm, Although wearability and scratching on the glass surface are satisfied, dust removal and sealing properties are inferior. Unless Rz is 300 μm or more and 500 μm or less, the performance required for the product is not satisfied for all test items.
2) As can be seen from Table 3, regarding the relationship between the L / t value and the uneven shape in the die dimension, the Rz value of 300 μm or more was obtained using two types of surface layer forming material compositions having different cross-linking particle contents. The value of L / t is 100 to 150, and when the value of L / t is 250, the top of the mountain is crushed and a sharply sharpened protrusion cannot be obtained.Yes.
[ProductIndustrial usesex】
[0033]
BookThe invention is a weather strip for vehicles without flocking.OfIt relates to a manufacturing method, and does not require complicated and expensive processes such as flocking processing, and has the same performance as a flocking type weatherstrip, such as slidability, dust removal, and low glass surface scratch resistance. A weather strip that provides wear resistance, flexibility, and sealability is provided. In addition, since it can be efficiently produced using a thermoplastic resin composition or a thermoplastic elastomer composition having excellent moldability, it is possible to use a high-performance and inexpensive weather strip used for automobiles, especially planting.Hairless windowSince the weather strip for the glass outer surface is provided, the industrial utility of the present invention is great.
[Brief description of the drawings]
[0034]
[Figure 1] BookFIG. 2 is a schematic cross-sectional view of a non-flocked weatherstrip according to the invention.The
[Figure 2]It is explanatory drawing which shows the state which attached the weather strip by this invention same as FIG. 1 to the door window glass.The
[Figure 3] BookSchematic showing a two-color die used when manufacturing a non-flocked weatherstrip according to the invention(A)Is a schematic partial cross-sectional view of a two-color extrusion die perpendicular to the extrusion axis.(B)Is a schematic cross-sectional view of the two-color extrusion die represented by the surface including the extrusion axis.The
[Figure 4]FIG. 6 is a schematic cross-sectional view of a conventional flocking type weatherstrip.The
[Explanation of symbols]
[0035]
1: Weather strip
2: Core material
3: Body part (of weatherstrip 1)
4: Lip part
5: (Nylon) pile
6: Lip surface layer
7: (Vehicle door) Window glass

Claims (1)

A weather strip for a vehicle without flocking, in which a main body portion attached to a vehicle and at least one lip portion that comes into contact with a door window glass surface are integrated, and a surface that contacts the glass surface of the lip portion, A lip surface layer portion made of a thermoplastic resin composition or a thermoplastic elastomer composition is formed, and the surface of the surface layer portion has an uneven shape with a 10-point average surface roughness Rz of 300 to 500 μm, and the uneven shape is The ratio Sz / So between the area Sz of the portion facing the valley in the measurement range of the virtual plane at a level 0.6 Rz below the peak line and the total area So of the measurement range is 0.4 or more, and the lip in the manufacturing method of flocking without weatherstrip for a vehicle dynamic friction coefficient to the glass surface of the surface layer portion surface does not exceed 0.35, Oyo body portion to the first extruder Upon supplying the first molding composition to form a lip, extruding dichroic both by supplying coextrusion the second molding composition for forming the lip surface portion to a second extruder , the shape of the two-color extrusion die, auto dual without flocking you and the ratio L / t of the die land length L and the thickness t of the lip surface portion has a shape in the range to the 200 20 Weatherstrip manufacturing method.

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