JP2007196493A - Part bonding structure for blow-molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a part bonding structure for a blow-molded article by which a bonding of a high strength can be performed without requiring a temperature setting or a temperature control. <P>SOLUTION: For a part 2 which is joined to a parison 1, at least a jacket 22 which is the joining section to the parison 1 is covered with a resin material, and in addition, a recess section 22a and/or a protruding section are provided on the jacket 22. Thus, at the time of blow-molding, the parison 1 wraps around along the recess section 22a and/or the protruding section, and a fastening in which "slipping off" and "turning" are prevented from occurring is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a component joining structure of a blow molded article obtained by joining a parison and a component.

  Conventionally, by extruding the plasticized plastic with an extruder as a cylindrical parison, sandwiching the parison between a pair of molds m1 and m2, the top and bottom of the parison are closed, and air is blown into the parison to design the mold. There is a blow molding device that swells and forms a shape along a surface (see, for example, Patent Document 1).

  A blow molded body is formed by the blow molding apparatus as described above, and some of the blow molded bodies have a parison and a part joined together. For example, a resin tank or a resin fuel pump (housing portion) in which a nut to be attached to another constituent member is embedded may be used.

  The part joining structure in such a blow molded body in which the nut is embedded is an insert product in which the nut is directly joined to the parison during blow molding or the nut is wrapped and solidified with a molten resin. It is common to weld an insert with a parison.

Japanese Patent Laid-Open No. 5-200844 (page 3, FIG. 1)

The former component joining structure described above connects a metal nut and resin by blow molding, but the joining strength is limited.
In addition, the latter component joining structure requires preheating the insert product in order to weld the insert product to the parison by blow molding.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the component joining structure of the blow molded body in which high intensity | strength joining is possible, without requiring temperature setting and temperature control. .

In order to achieve the above technical problem, the blow molded article joining structure according to the present invention employs the following technical means.
In other words, the blow molded body part joining structure according to claim 1 is a blow molded body part joining structure formed by joining a parison and a part, and the part of the part is made of a resin material. In addition to being covered, the resin material is provided with a concave portion or / and a convex portion, and the parison and the resin material are welded together by blow molding.
According to a second aspect of the present invention, there is provided the blow molded article joining structure according to the first aspect, wherein the part is a nut.

  According to the present invention, a part to be bonded to a parison is covered with a resin material at least at a bonding portion with the parison, and further, a concave portion or / and a convex portion are provided in the resin material. Since the parison goes around along the concave part and / or convex part and becomes a locked state, high-strength joining can be performed without requiring temperature setting or temperature management.

  Next, a description will be given of an embodiment of a component bonding structure of a blow molded body according to the present invention. The embodiment of the component joining structure for blow molded bodies according to the present invention is applied to a fuel tank of an off-road motorcycle.

  As shown in FIG. 1, the component joining structure of the blow molded body A according to the present embodiment is such that a component 2 formed by wrapping a nut 21 with a molten resin and solidifying it is integrated with the parison 1 by blow molding. It is welded to.

  That is, as shown in FIG. 1 and FIG. 2, the component 2 has three grooves 21a extending from approximately half to the upper part of a metal rod-shaped member, and a female screw is formed at the center of the rod-shaped member. The nut 21 is an insert product, and the outer cover 22 is insert-molded with a resin material so that the female screw entrance side of the nut 21 is exposed. The outer cover 22 and the parison 1 are preferably made of the same resin material.

  The groove 21a increases the surface area of the nut 21 to increase the bonding surface with the resin material and increase the bonding force, and at the same time, prevents the "disengagement". As is well known, this insert molding is a method in which an insert is wrapped with a molten resin and solidified, and its bonding strength is high.

  The outer cover 22 is formed of a resin material in a substantially truncated cone shape, and a concave portion 22a having a substantially U-shape is provided in the middle of the conical surface so as to be opposed to each other, as shown in FIG. As described above, the parison 1 goes around the recess 22a to prevent "detachment" and "rotation".

  In the present embodiment, as described above, the concave portion 22a having a substantially U-shape is provided on the outer cover 22 so as to be opposed thereto. However, the present invention is not limited to this. For example, the convex portion is opposed to the concave portion 22a. These concave portions 22a and convex portions may be provided at one place or at several places.

  In the present embodiment, the outer cover 22 is formed in a substantially truncated cone shape. However, the present invention is not limited to this, and the outer cover 22 is formed in a rectangular shape having a draft, and the above-mentioned is described in the middle thereof. A concave portion 22a or a convex portion may be provided. In other words, the shape is not particularly limited as long as it can prevent “dropping” and “turning”.

  The fuel tank according to the present embodiment is applied to the fuel tank of an off-road motorcycle as described above, and the nut 21 described above includes a cover, a seat mounting stay, a tank mounting rubber stay (all of them). Used to attach (not shown).

  Next, the manufacturing procedure of the blow molded article A according to the present embodiment will be described in order with reference to FIGS.

  First, the component 2 molded by insert molding is set in the pair of molds m1 and m2. And the resin plasticized with the extruder which is not shown in figure is extruded between a pair of metal mold | dies m1 and m2 as a cylindrical parison 1 through a die | dye (refer FIG. 3).

  Next, the parison 1 is sandwiched by closing the pair of molds m1 and m2 (see FIG. 4: the middle of mold closing is shown).

  When the mold closing of the pair of molds m1 and m2 is completed, the top and bottom of the parison 1 are closed, and air is blown into the parison 1 through an air blowing port provided at an arbitrary position such as the center of the die. 1 is inflated and pressed against the inner surface of the mold. At this time, the parison 1 goes around the recess 22 a of the outer cover 22.

  Then, the parison 1 pressed and stretched in the mold is solidified as it is (see FIG. 5). When solidification is completed, the air is evacuated, the mold is opened, and the product fuel tank is taken out.

  As described above, in the component bonding structure of the blow molded body A according to the present embodiment, the component 2 to be bonded to the parison 1 is covered with the resin material at least the outer cover 22 that is a bonding portion with the parison 1, By providing the concave portion 22a and / or the convex portion on the outer cover 22, the parison 1 goes around along the concave portion 22a and / or the convex portion at the time of blow molding, and “disconnect” and “rotate” ”Is prevented.

  In other words, the component joint structure of the blow molded body A according to the present embodiment can perform high-strength joining, and does not require temperature setting and temperature management as in the past, so that productivity can be improved. Can do.

  As mentioned above, although the component joining structure of the blow molded body concerning this Embodiment was demonstrated, embodiment mentioned above shows an example of the suitable embodiment of this invention, and this invention is limited to it. However, various modifications may be made without departing from the scope of the invention.

The longitudinal cross-sectional view of the fuel tank to which the component joining structure concerning this Embodiment is applied. The perspective view of components. Explanatory drawing which shows the manufacturing procedure of a blow molded object. Explanatory drawing following FIG. Explanatory drawing following FIG.

Explanation of symbols

A ... Blow molding 1 ... Parison 2 ... Part 21 ... Nut 21a ... Groove 22 ... Sheath 22a ... Recess

Claims (2)

It is a blown molded part joining structure in which a parison and parts are joined,
The part has a joint with the parison covered with a resin material, and the resin material includes a recess or / and a protrusion,
A blow molded article joining structure in which the parison and the resin material are welded together by blow molding. 2. The component joining structure of a blow molded body according to claim 1, wherein the component is a nut.

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