JP2548315Y2 - Automotive plastic parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a synthetic resin member for an automobile attached to a body, a window frame or a bumper of an automobile.
The present invention relates to a member of a type in which a long molded product is cut to a predetermined length and used, wherein a shrinkage rate is reduced.

(Prior Art) Conventionally, as a synthetic resin member for an automobile, for example,
Weather strip, side molding, bumper molding,
2. Description of the Related Art Various types of members, such as flash mounts and headlining trims, which are used to cut and attach a long molded product to a predetermined length are used in various places.

Since this type of member is of the type in which a long molded product is cut into a predetermined length and attached as described above, when the attached member contracts in the longitudinal direction due to an external temperature change, a gap is generated at an end portion. Not only is it not desirable from the viewpoint of appearance, but also the members intended for sealing impair the air-tightness and water-tightness of the ends.Therefore, each automobile manufacturer assumes a temperature difference between severe cold and hot summer. Therefore, it is required that the shrinkage at a certain temperature is within a certain range.

For this reason, conventionally, depending on the cross-sectional shape and size of the molded article, the allowable shrinkage rate range, etc., the formed long molded article is annealed at a high temperature to stabilize the shrinkage rate, or a member such as a weather strip is used. With respect to (1), one piece of iron aggregate or metal wire made of a strip of iron or stainless steel or the like is provided inside to suppress heat shrinkage.

(Problems to be Solved by the Invention) In the conventional means for annealing a long molded article, it is necessary to repeat annealing until the shrinkage of the molded article is stabilized within an allowable range. For this reason, the number of manufacturing steps increases, and it takes time, resulting in an increase in cost. In addition, there is a drawback that sufficient results cannot be obtained.

On the other hand, in the case where the conventional iron aggregate or the like is installed, the strength and shape retention of the mounting portion are excellent in that the overall shrinkage in the longitudinal direction is small, but the mounting portion is generally It becomes thicker and heavier because the aggregate is made of iron, which makes it difficult to cut, and when the aggregate is iron, etc., rust occurs at the terminal, so that the terminal treatment is troublesome, while stainless steel Aggregates have disadvantages such as an increase in cost.

Conventionally, there is a soft synthetic resin molded product in which glass fiber is disposed as a core material inside, but the purpose of this glass fiber core material is to increase the tensile strength of a soft synthetic resin molded product such as a string, a belt, or the like. Was for.

The present inventor has studied various types of core materials for suppressing thermal shrinkage of a rigid synthetic resin molded product having rigidity, and cannot control rigidity with stiffness rather than rigidity with rigidity. Based on the idea, various types of fiber cores were installed inside a hard synthetic resin molded product, and various experiments were performed. It has been found that when arranged in a well-balanced manner, heat shrinkage does not occur at all or becomes extremely small.

Accordingly, an object of the present invention is to solve the above-mentioned conventional disadvantages, to simplify the manufacture, to significantly reduce the longitudinal shrinkage due to temperature change, and to reduce the cost, and to reduce the cost. It is to provide a member.

(Means for Solving the Problems) The synthetic resin member for a vehicle according to the present invention is a member for a vehicle in which a long molded product is cut into a predetermined length and attached to a vehicle body, a window frame, a bumper, or the like. In the synthetic resin member, the long molded product is formed by a composite extrusion, a part of which is a mounting part is extruded with a hard synthetic resin material, and the other part is molded with a soft synthetic resin. And a core yarn of a plurality of twisted glass fiber yarns embedded inside the portion, and the core yarns are arranged at equal intervals in parallel with each other along the longitudinal direction of the main body.

(Function) As a member for an automobile, a main body is formed by extruding a part of a mounting portion with a hard synthetic resin material by composite extrusion and extruding another portion with a soft synthetic resin. At this time, a plurality of twisted glass fiber yarns are inserted into the molding die portion where the hard synthetic resin portion is molded at a predetermined interval by a suitable means, and the glass fiber twisted yarn is fed in synchronization with the molding speed. As a result, a plurality of glass fiber core yarns are provided in parallel in the longitudinal direction in the molded portion made of the hard synthetic resin material. The number of glass fiber twisted yarns, the spacing between twisted yarns, and the like differ depending on the molded product to be molded.

A sample in which a glass fiber core yarn is provided in parallel in a hard synthetic resin part in this way is prepared, and cut into a predetermined length, and the heat shrinkage in the longitudinal direction is measured. As described above, no heat shrinkage was observed even at the high temperature conditions required by automobile manufacturers, and an excellent effect of preventing heat shrinkage was obtained.

This result is considered to be due to the fact that the thermally stable glass fiber is twisted and the binding property with the hard synthetic resin is enhanced. It is expected that heat shrinkage will be extremely small even in a synthetic resin member for automobiles.

In the synthetic resin member for automobiles configured as described above, the repetition of annealing at high temperature is unnecessary, and the cost can be significantly reduced. In addition, the structure is simple and it is easy to cut it to a predetermined length, and the portion in which the glass fiber core yarn is provided does not become particularly thick.

(Example) The first example of the automotive synthetic resin member according to the present invention will be described.
FIGS. 1 to 4 show an example in which the present invention is applied to a weather strip having a complicated cross-sectional shape, FIG. 1 is a cross-sectional view, and FIG. FIGS. 3 and 4 are cross-sectional views showing other configuration examples. FIG. 5 is a cross-sectional view of a sample in which the whole is formed of a hard synthetic resin material into a band shape as a basic form of various members.

In the drawing, reference numeral 1 denotes the entire weatherstrip, and there are various cross-sectional shapes depending on a place to be used, a vehicle type, an automobile manufacturer, and the like. In the example of FIG. 1, as shown in FIG. A vertical mounting portion 2 fixed to the outer plate 11 via a clip member 13 and flexible sealing pieces 3, 4, 5 extending from the mounting portion 2 are provided.

The mounting part 2 is made of a hard synthetic resin material such as hard vinyl chloride, and the seal pieces 3, 4, and 5 are made of a soft synthetic resin material such as soft vinyl chloride. Is done. In the present invention, when a hard synthetic resin is used, it does not necessarily mean that the rubber must have a hardness of 100 ° or more according to the JIS standard, and is used in a general concept within a rubber hardness of 90 ° to 100 °. There is no problem even if it is so-called semi-rigid.

At the time of integrally molding the mounting portion 2 and the seal pieces 3, 4, 5 as described above, a plurality of twisted glass fiber yarns are inserted into the mold portion on which the mounting portion 2 is to be formed by an appropriate means, and in the embodiment, five twisted yarns are inserted. Then, it is continuously fed in synchronization with the extrusion speed.
In this manner, core threads 6 made of five glass fibers are provided in parallel in a well-balanced manner along the longitudinal direction in the mounting portion 2 of the weather strip 1 thus formed. The number of glass fiber twisted yarns to be inserted and the spacing between the twisted yarns, etc., should be determined according to the molded product to be formed. Can be inserted. When such a means is used, the heat shrinkage effect is further enhanced by the fact that the glass fibers are twisted and the binding property by an adhesive or the like is enhanced.

In the example shown in FIG. 1, the outer surface of the seal piece 3, which is to be in contact with the door glass 12, of the seal pieces 3, 4, and 5 is subjected to flocking in a later step, but is used as described above. The cross-sectional shape differs depending on the location, vehicle type, and the like. For example, there is a cross-sectional shape as shown in FIGS. 3 and 4.

In the sample A shown in FIG. 5, various members are formed into a belt-like body 10 having a width of 15 mm and a thickness of 1.5 mm by using a hard synthetic resin as a basic form. In this sample, there are four core yarns 6.

Next, a sample A shown in FIG. 5 and a comparative sample B consisting of a simple hard synthetic resin having the same size and cross-sectional shape as the sample A
As a result of comparative measurement of the heat shrinkage ratios of the and, the results are as shown in the table below.

The heating conditions were 105 ± 5 ° C for 1 hour.
The change in length before and after the heating was measured. The cooling was performed by natural cooling, and after a lapse of time, it was taken out of the furnace and left at room temperature.

In the table, the numbers in the left column are sample numbers. L1 is the length before heating, L2 is the length after heating, the shrinkage R is L1-L2, As is clear from the above comparative measurement results, it is recognized that the sample having the structure according to the present invention has no heat shrinkage and is extremely stable. Therefore, it turns out that a member made of a synthetic resin for automobiles having the same structure as the sample has no heat shrinkage or a very small heat shrinkage rate even if the external shape is different.

(Effects of the Invention) According to the synthetic resin member for automobiles according to the present invention, a part of the mounting part is extruded with a hard synthetic resin material by composite extrusion, and the other part is molded with a soft synthetic resin. It is composed of a main body and a plurality of glass fiber twisted cores embedded in the main body, and a plurality of glass fiber cores are longitudinally mounted on a mounting portion formed of a hard synthetic resin. The heat shrinkage of the rigid synthetic resin part having rigidity can be controlled by a flexible core material, and the heat shrinkage can be extremely reduced as can be seen from the comparative test data. it can. Therefore, it is not necessary to repeat annealing at high temperature,
The cost can be significantly reduced, the structure is simple, and it is easy to cut it to a predetermined length, and the portion in which the glass fiber core yarn is provided may be particularly thick. It is most suitable as a synthetic resin member for automobiles.

[Brief description of the drawings]

The drawings show an embodiment of a synthetic resin member for automobiles according to the present invention, FIGS. 1 to 4 show examples in which the present invention is applied to a weather strip having a complicated sectional shape, FIG. 1 is a sectional view, and FIG. FIG. 3 is a cross-sectional view showing an attached state, and FIGS. 3 and 4 are cross-sectional views showing other configuration examples. FIG. 5 is a cross-sectional view of a sample in which the whole is formed of a hard synthetic resin material into a band shape as a basic form of various members. 1: Weather strip, 2: Mounting part, 3, 4, 5: Seal piece,
6: core yarn

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-73962 (JP, A) JP-A-59-177463 (JP, A) JP-A-52-32045 (JP, A) 25688 (JP, A) Japanese Utility Model Showa 58-537 (JP, U) Japanese Utility Model Showa 60-150023 (JP, U) Japanese Patent Publication No. 52-22858 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A synthetic resin member for automobiles, wherein a long molded product is cut to a predetermined length and attached to an automobile body, a window frame, a bumper, or the like, wherein the long molded product is attached by composite extrusion. A part of the body is extruded with a hard synthetic resin material and the other part is molded with a soft synthetic resin, and a core yarn of a plurality of twisted glass fiber yarns embedded inside the main body. Wherein the core yarns are arranged at equal intervals in parallel with each other along the longitudinal direction of the main body portion.