JPH02233227A - Manufacturing method for blow molded products - Google Patents

Abstract

PURPOSE:To enable the fixing performance of a resin-molded material and a pole material to be sufficiently secured without increasing a manufacturing cost by a method wherein the embedding fixing part of the pole material is heated to melt a powdered resinous material, the resultant molten resinous material is made to adhere to the embedding fixing part to form an adhesion layer thereon, and its adhesion layer is joined with a resinous material in a semi-molten state, which is injected from a die side. CONSTITUTION:The embedding fixing part 31 of a pole material 3 in the state of a single substance is first heated locally to be embedded into a powdered resinous material 4. As a result, the powdered resinous material 4 in the periphery of the embedding fixing part 31 is melted due to heat thereof, and the resultant molten resinous material is made to adhere to the circumference of the embedding fixing part 31 to form a fusion deposition layer 5 with a predetermined thickness. Then, the pole material 3 having the deposition layer 5 formed on the embedding fixing part 31 thereof is set on a predetermined position in a blow molding die, and a semi-molten resinous material for blow molding is injected from the die side so as to position the pole material 3 on the predetermined position in the blow molding die. In such a state, the blow molding die is clamped to perform blow molding, and the semimolten resinous material and the adhesion layer 5 of the pole material 3 are closely contacted to each other by the clamping force of the blow molding die to fusion weld both of them integrally. Thereafter, the blow molding die is opened to remove a blow- molded product 1 from the interior of the die.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in Industry) The present invention relates to a method for manufacturing a blow-molded product in which a metal ball material is embedded and fixed in a resin molded body during blow-molding. be.

(Prior art) Fig. 4 shows a resin molded body 52 obtained by blow molding a resin material, and two metal pieces with one end embedded and fixed inside the resin molded body 52 during flow molding of the tree molded body 52. Ball + A'
5 3. A blow molded product 51 (specifically (J, core body of an automobile headrest) is shown) consisting of 5. As shown in the figure, a common method was to encapsulate and secure an embedded fixed part 53a of a ball 53 formed into a straight rod shape with a part of a resin molded body 52.

By the way, when blow molding, η・
1. Need to maintain the shape of the cylindrical resin material to be dispensed. 2.
Since it is difficult to increase the melting degree of the resin], it is usually used in a semi-molten state.

On the other hand, it is well known that the adhesion between a resin material and a metal ball can be further improved if the melting degree of the resin material is higher (the lower the viscosity), the better the compatibility between the two will be. It is a fact.

Therefore, the ball material 53 is embedded and fixed in the resin molded body 52 at the blow molding +1'j.'' According to the conventional method, since the resin is in a thin or semi-molten state during blow molding, it is natural that the resin In order to secure the adhesion force between the molding hole 52 and the ball hole 53 (there is a J limit, it is difficult to obtain a very strong adhesion force.

For this reason, the blow molded product 51 manufactured by the conventional method
In case of 1F of long jυI, or if an excessive load is applied between the two (1), peeling occurs at the bonded part, Visit 5
There was a fear that 3 would fall out of the resin molding 52.

In view of these circumstances, for example,
Disclosed in Publication No. 254, ] Ichi, Ball Shrine 53
A part of the buried fixing part is pressed down to form an odd-shaped part, or two ball holes 53 are continuously opened in a substantially U-shape and integrated, and this continuous part is buried and fixed in the resin molded body 52. Therefore, a method has already been proposed for preventing the ball cage 53 from coming off the resin molded hole 52.

(4" problem to be solved by the invention) However, as in the publicly known example, the balls 4, 15 are hollowed out on 3 sides {-j stop 1 []".
t + r + processing equipment is required, but there is a problem that the manufacturing cost increases by 100% due to the increase in the number of man-hours.

Therefore, the present invention proposes a method for producing a no-molded product that can ensure sufficient adhesion performance between the resin molded body and the ball holder without causing such an increase in manufacturing costs. This is the case of Party B.

(Technical background of the invention) Book [? As the inventor of Ji (J), as a result of his efforts to develop such a manufacturing method, he came up with the following technical idea.
Therefore, the adhesive force between the resin IA and the metal ball plate is determined by the fact that the melting degree of the resin is particularly strong, and that the adhesive force between the resin materials is very strong. We focused on the following two points: If the melting degrees of both resins are the same, it will not be affected much by the fluctuation of the melting degree itself, and a fairly uniform adhesion force can be obtained.And, First, from the perspective of ensuring sufficient adhesion between the resin and the ball,
Separately from no-molding, the ball is heated for about 1 hour and embedded in the powdered resin, and the heat sufficiently melts the powdered resin around the ball and fuses it to the surface of the ball. to form a fusion layer. Next, from the viewpoint of ensuring sufficient hardening force between the welding layer and the semi-molten resin +2 to be blow molded, the welding layer has a semi-molten shape. Perform blow molding while holding.

As a result, we were able to secure sufficient adhesion between the flow-molded resin molding and the ball IA without performing any other machining on the ball 1). The present invention is based on this technical idea, and is a concrete means for solving the problem. As a means,
A block consisting of a resin molded body obtained by flow molding using a semi-molten resin produced from Thailand and a metal ball embedded and fixed in the resin molded body. After heating the embedded fixing part of A in the resin molded body to a predetermined temperature, it is brought into contact with a powdered resin material, and the powdered resin is melted on the surface of the embedded fixing part.
: ] A fusion layer is formed on the surface of the buried fixing part by attaching the ball material, and after 7, while the fusion layer is maintained in a semi-molten state, the ball material described in -1- is buried and fixed. Place the part in a blow molding mold and perform blow molding, and by closely joining the semi-molten resin layer and the fusion layer on the ball IA side to each other, the ball side It is characterized in that it is embedded and fixed in the resin molded article 7 at a U° angle.

(Function) By changing the structure of the present invention, (1) the buried fixing part of the ball is fused with a powder resin material to the surface of the buried fixing part. Forming a fusion layer - Due to the process, the bonding force between the buried fixing part and the fusion layer can be sufficiently increased. (2) During blow molding, there is a By joining the adhesive layer together in a semi-molten state, the adhesive layer and the resin material on the goose side are temporarily suspended, and the adhesion strength between the two can be sufficiently increased. (3) As a result, the following effects can be obtained: the adhesion force between the molded tree molded body and the ball shrine embedded and fixed therein can be sufficiently increased.

(Effect of the invention) Therefore, according to the method for manufacturing a no-molded product of the present invention,
Since the hardness between the resin molded body and the ball can be sufficiently increased, there is no need to apply special processing to the ball phase to prevent it from being pulled out, as is the case with conventional manufacturing methods. 171, which is inexpensive and has sufficient adhesion force.
This has the effect of making it possible to manufacture a single molded product.

(Example) Hereinafter, preferred embodiments of the present invention will be described with reference to Figures 1 to 3. Figure 1 shows a blow molded product manufactured by applying the method for manufacturing a blow molded product of the present invention. Is there a vertical cross-sectional view of a blow-molded product I that will become the core of an automobile headrest?

This blow molded product 1 consists of a resin molded product 2 obtained by blow molding a cliff-molten resin material injected into a cylinder from a tie using a blow mold (not shown) as described above, and Ball material 3 whose embedded fixing part 3I on the - end 1 side was embedded and fixed in the resin molded body 2 during blow molding in step 2
It is composed of.

In order to sufficiently secure the adhesion force between the blow molded product 1, the resin molded body 2, and the ball hole 3, the present invention is applied to bury the pole hole 3 as a pre-step of blow molding. A welding IE 5, which will be described later, is formed on the fixing portion 31.

The manufacturing method from the formation of the fusion layer 5 to the completion of blow molding will be described below with reference to the work steps shown in FIG.

During the production of the blow molded product 1, the buried fixing part 31 of the ball cage 3 which is in a resting state is locally heated (Step S1 in Figure 3). The heating temperature of the buried fixing part 3l (J, powder resin I to be used in the next step (second step S2)) is set based on the abrasive quality of 4 (2nd section 1 reference 1 ft), In this example, powdered polyethylene is used as the powdered resin + A4, and correspondingly, the IJ [1 heat l1 x 11, 240°C
〜28(]'C is set to 3, Incidentally, the semi-molten resin IA that is injected from Thailand and is not suitable for molding has its phase as its density polyamide, and is injected from Thailand. Within l 8 0°C - 1 90°C!j
+: Maintains + degree.

Next, the embedded fixing part 31 of the ball +A3 heated in the IT step S1 is buried in powder resin +A'/1 to a thickness of 1" as shown in FIG. 2, and the heat of the embedded fixing part 31 causes the surrounding The powdered resin material 4 is melted and fused around the buried fixing part 3 to form a fused layer 5 having a predetermined thickness.

Next, the ball o A3 with the fusion layer 5 formed in the embedded fixing part 31 is mounted at a predetermined position in the flow molding mold (third
Wang Cheng S,,). ``Installation work on no-molding mold + [
During JI, heat is gradually radiated and the temperature drops to about 170° C., and the welding layer 5 is in a semi-molten state.

Next, the process moves to blow molding (fourth upper step S4). That is, the semi-molten resin +2 for flow molding is injected from the tie side and positioned at a predetermined position in the no-molding mold. The temperature has decreased to about 150°C, and the heat is further radiated from the fusion layer 5 on the side of the ball 3 above the manoko, resulting in a temperature of about 150°C. 3. In this state, blow The molding mold is closed and blow molding is performed, and the closing force of the blow molding mold is used to make the fusion layer 5 of the paulownia ball 3
4. Temporarily fusion weld the two together.

After that, a molded metal is formed. Open 111 and take out the no-molded product 1 from inside (5th upper step, S.),
This completes the molding operation of the no-molded product I.

By chanting in this way, as shown in FIG. i'R power should be maintained sufficiently. Accordingly, even if the embedded fixing portion 31 of the ball material 3 is made into a straight rod shape without any special processing, the ball material 3 will not fall off from the resin molded body 2.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of a blow-molded product produced by the blow-molded product manufacturing method of the present invention, and FIG. 2 shows the state of fusion of the powdered resin material to the ball cage shown in FIG. 1. 3 is a working process diagram of blow molding by the blow molding method of the present invention, FIG. 4 is an external perspective view of a conventional general blow molded product, and FIG. V=V is an enlarged vertical cross-sectional view. 1... Blow molded product 2... Resin molded body 3... Ball material 4... Powder resin edition 5...・Fusion layer - 18310 pieces

Claims (1)

[Claims] 1. When manufacturing a blow molded product consisting of a resin molded body obtained by blow molding using a semi-molten resin material injected from a die and a metal pole material embedded and fixed in the resin molded body, the above-mentioned pole After heating the embedded fixing part of the material to the resin molded body to a predetermined temperature, it is brought into contact with a powdered resin material and the powdered resin material is melted and adhered to the surface of the embedded fixing part, thereby reducing the surface of the embedded fixing part. Then, while the welding layer is maintained in a semi-molten state, the embedded fixing part of the pole material is placed in a blow molding die and blow molding is performed to form the above half. A method for manufacturing a blow molded product, characterized in that the pole material is embedded and fixed in the resin molded body by closely bonding the molten resin material and the fusion layer on the pole material side.