JPS61112614A - Resin molded product and molding device thereof - Google Patents

Abstract

PURPOSE:To contrive to achieve the process molding on outer surface part, the process arranging a core part in the outer surface part and the process packing a foam in between the outer surface part and a core part by the same device by filling the hollow part with the foam through a hollow stay from a pouring head. CONSTITUTION:When a foam is poured into a stay 7 from a pipe 37, it is poured into the hollow space 40 between the outer surface part 2 stuck on the wall surface of the molding recesses 20, 21 of molds 18, 19 and a core part 4 from the opening tip of the stay, and then the space is filled with the foam being foamed. Then, the molds 18, 19 are opened, and the pipes 33, 37 are removed from the base end of the stay 7. The molded product is taken out, removing the stay 7 from a fixing device 26. Consequently the process for molding the outer surface part, the process providing the core part in the outer surface part and the process for packing the foam in between the outer surface part and the core part may be achieved by a same device, thereby reducing operating time and the investment for the device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resin molded product such as a headrest provided on a seat used in a vehicle, etc., and a molding apparatus therefor.

(Prior art) As a conventional resin molded product, for example,
The one described in Japanese Patent No. 8437 and the one shown in FIG. 6 are known.

First, the headrest as a resin molded product described in Japanese Patent Application No. 59-118437 is first formed by molding a hollow molded product using a molding device, and then forming an injection port for injecting the foam raw material into this hollow molded product. Next, a core having two stays is provided inside the hollow molded product from the injection port, and a blocking material made of nonwoven fabric or the like is attached to the back side of the injection port, and then the injection port and the blocking material are attached to the back side of the injection port. The foam material was injected and foamed into the hollow molded product from between the molded material and the molded material.

Next, the headless 100 shown in FIG. 6 is manufactured by molding a hollow outer surface lO1 with an injection port 106 and a core 102 to which two wooden stays 103 and 104 are attached in separate steps. Then, from the injection port 106 to the core 102
is placed inside the outer surface portion 101, and then the injection port 10 is placed inside the outer surface portion 101.
6, urethane 105 is injected and foamed into the outer surface portion 101, and finally, a plate 107 is inserted through the stay insertion holes 108, 109 into the stays 103, 104, and the injection port 106 is closed by the plate 107. It was molded by

(Problems to be Solved by the Invention) However, in such a conventional headrest, the process of molding a hollow molded product (outer surface portion 101),
A process of arranging a core having two stays inside the hollow molded product, and a step of placing a foam raw material (urethane 105
) was a separate process, and the blow molded product needed to be provided with an injection port for injecting the foam raw material (urethane 105) and a closing material to block the injection port. There were problems as listed below.

1) The number of molding steps increases.

2) Manufacturing time increases.

3) Mold jig costs increase.

0 Equipment costs will increase.

5) Logistics costs between factories will increase.

B) Accessory parts such as occluders and plates are required, increasing the number of parts.

(Means for Solving the Problems) Therefore, the present invention has been made for the purpose of solving the above-mentioned problems, and in order to achieve this purpose, the first
The resin molded article of the invention has an outer surface, a core, and a hollow stay, and the stay penetrates one side of the outer surface and the core, and the stay penetrates through one side of the outer surface and the core. In the apparatus for manufacturing a resin molded product of the second invention, the means extends between an outer surface part and the core part, and a foam is filled between the outer surface part and the core part. means having a hollow stay with a tip opening in a hollow part between the stay and a resin injection head connected to a base end of the stay located outside the mold and filling the hollow part with a foam; did.

(Function) Therefore, in the molding apparatus for a resin molded product of the present invention, by using the hollow stay of the resin molded product as a resin injection member in the molding apparatus, foaming is carried out from the resin injection head into the hollow part through the hollow stay. In order to be able to fill the body, in the manufacturing process of resin molded products, there are two steps: molding the outer surface, placing a core with a hollow stay inside the outer surface, and forming the outer surface and the core. and the step of filling the foam between the two can be performed by the same device.

Further, in the resin molded product of the present invention, when the outer surface portion is molded, the core portion having the stay is already placed inside, and the foam filling is also performed in the same device as the outer surface portion molding device. In this case, the resin injection port is not opened to the outer surface as in the conventional case, and furthermore, a closing member for closing the opening can be omitted.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In describing this embodiment, a headrest molded by blow molding and a blow molding apparatus therefor will be described.

First, the structure of the headrest of the embodiment shown in FIG. 1 will be explained.

Reference numeral 1 denotes a headrest, which is molded by blow molding, and this headrest 1 has an outer surface 2, a core material 3, and urethane 15.

The core material 3 is molded by blow molding, which is different from the blow molding used to mold the headrest 1, and includes a hollow core portion 4 and a hollow core portion 4 with locking grooves 5 and 6 provided at the base end thereof. It is composed of stays 7 and 8.

Further, both stays 7.8 of the core member 3 are provided so as to penetrate the upper surface and the lower surface of the core portion 4 (through-hole 9°lO and through-hole 11.12), and further extend through the closed opening of the outer surface portion 2. 13
．． 14 are provided in a penetrating state.

The open tips of both stays 7.8 are disposed between the outer surface portion 2 and the core portion 4, and the base ends thereof protrude from the outer surface portion 2.

15 is urethane, and the outer surface portion 2 and the core portion 4
This urethane 15 is filled between the headrest 1 and the headrest 1 after the blow molding of the outer surface portion 2 is performed, and is filled with the molding device to maintain the shape of the headrest 1 and provide cushioning properties.

Next, regarding the headrest molding apparatus of the example, the second
The configuration will be explained with reference to FIG. 3 and FIG.

Reference numeral 16 denotes a deriving device, which is provided with a nozzle 17. This deriving device 16 converts the softened thermoplastic resin A into a continuous cylinder (referred to as a parison) from the nozzle 17. This is what is derived.

Reference numeral 18.19 denotes a mold, which is used to mold resin into the shape of the molding recesses 20 and 21 by closing them from the left and right sides. Relief hole 22.2 with a predetermined interval between the stay 7.8
3 relief grooves 24 and 25 are provided.

26 and 27 are a stay fixing device that also serves as an air vent pipe and a stay fixing device that serves as an injection pipe, respectively, and the core material 3
stay 7 and stay 8.

Each has a fixing hole 28.29 for fixing.
is formed and mounted on a base 30 disposed below the molds 18 and 19.

In addition, both the stays 7.8 are connected to the respective fixing holes 28 of the re-fixing device 26.27 by the respective locking grooves 5.6.
．． 29 in a downwardly protruding state, the blown rubber tube 3 during blow molding, which will be described later,
3 can be connected to the stay 7, and a foam injection rubber tube 37, which will be described later, can be connected to the stay 8.

31 is an air blowing device, and the stay fixing device 2
6, and blows air into the resin cylinder A1 from the stay 7. This air blowing device 31 connects an air tube 34 from an air supply device and a valve 32 from the air tube 34. and a blown rubber tube 33 connected to the stay 7.
connected to.

The valve 31 is provided with an air release hose 35, and by communicating the air release hose 35 and the blowing rubber pipe 33 by switching the valve, the air blown into the resin cylinder A1 is removed. can be released into the atmosphere.

Further, the blown rubber tube 33 is attached to the stay 7 with high fixity through the locking groove 5.

36 is a resin injection head, and the stay fixing device 2
7, and this resin injection head 36
An injection rubber tube 37 connected to the stay 8 is connected to one end, and two resin liquid tubes 38 and 39 are connected to the other end.

Incidentally, the resin injection pad 36 mixes the urethane stock solution (liquid A) injected from the resin liquid tube 38 and the urethane stock solution (liquid B) injected from the resin liquid tube 39. The liquid is filled from the tip of the stay 8 into the hollow part 40 between the outer surface part 2 and the core part 4 which are in close contact with the wall surface of the molding recess 20.21 of the mold 18.19.

Further, the injection rubber tube 37 is attached to the stay 8 with high fixity through the locking groove 6.

Next, the operation of the embodiment will be explained.

First, as shown in Fig. 2, the core material 3 is blow-molded in advance.
The stay 7 and stay 8 are each fixed by a stay fixing device 26.
and a stay fixing device 27.

In addition, in the fixed state, both stays 7.8 are connected to both stay fixing devices 26.
．． 27, in a position that protrudes downward from each of the fixing holes 28 and 29.

Next, connect the air blowing device 31 to the stay 7, and
Connect the rod 36 to the stay 8 for resin injection.

Next, as shown in FIG. 3, the heat-softened resin is drawn out from the nozzle 17 of the drawing device 16 in a cylindrical shape, and then the resin cylinder A1 is drawn out below the mold 18.19 (7). When finished, stop the ejection and remove the mold t as shown in Figure 4.
a, 19 are closed from the left and right, and both stays 7.8 are bonded and fixed inside the resin cylinder A1.

Then, when air is blown into the stay 7 from the blowing rubber tube 33 of the air blowing device 31 with the blowing rubber tube 33 and the air tube 34 communicating with each other through the valve 32, the air flows to the tip of the stay 7. The resin is blown into the inside of the resin cylinder A1.

Then, due to the blown air, the resin cylindrical body A1 is
As shown in Figure 4, the mold 18.19 is expanded.
The molded material is molded in pressure contact with the walls of the molded recesses 20 and 21, and in this molded state, the temperature gradually decreases and hardens, forming the outer surface portion 2 of the headrest 1.

Next, by switching the valve 32, the blowing rubber pipe 33 and the atmosphere release hose 35 are communicated, and the urethane stock solution (liquid A) is injected into the resin through the injection tube 38.
In addition, the urethane stock solution (B solution) is injected into the resin injection head 36 through the injection tube 39, and both urethane stock solutions (A solution, B solution) are mixed by the resin injection head 36.

Next, as shown in FIG. 5, when the mixed urethane stock solution is injected into the stay 8 from the injection rubber tube 37, it flows from the open end of the stay 8 into the molding recess 20 of the mold 18°19.
The air in the hollow part 40 is injected into the hollow part 40 between the outer surface part 2 and the core part 4 which are stuck to the wall surface of the 21, foams and is filled as urethane 15, and then the air in the hollow part 40 is released from the atmosphere opening hose 35. released into the atmosphere.

After that, open the mold 18.19, remove the blown rubber tube 33 from the base end of the stay 7, remove the injection rubber tube 37 from the base end of the stay 8, and fix both stays 7.8 to both stays. It is possible to remove the headrest 1 as a molded product by removing it from the devices 26 and 27, and to mold the headrest 1 as a resin molded product.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the resin molded product is not limited to a headrest, but may be a car seat, etc., and the molding device is not limited to a blow molding device, but may be another resin molded product molding device.

Further, the foam is not limited to urethane, and may be other foam materials, and the core is not limited to a hollow shape.

(Effects of the Invention) As explained above, according to the molding apparatus for a resin molded product of the present invention, when molding a resin molded product, the step of molding the outer surface part and the step of molding the core part having a hollow stay on the outer surface. The advantage is that the step of providing the foam inside the section and the step of filling the space between the outer surface and the core can be performed by the same molding device.

This effect can reduce molding man-hours, manufacturing time, mold jig costs, equipment costs, logistics costs between factories, and the like.

Furthermore, in the embodiment, in addition to the above-mentioned effects, one of the hollow stays can be used as an air blowing device during blow molding.

Further, in the resin molded product of the present invention, when the outer surface portion is molded, the core portion having the stay is already placed inside, and the foam filling is also performed in the same device as the outer surface portion molding device. This provides the advantage that the injection port is not opened to the outer surface as in the conventional case, and that the closing member that closes the opening can be omitted.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a headrest (resin molded product) according to an embodiment of the present invention, Fig. 2 is a sectional view showing a headrest molding apparatus according to an embodiment of the invention, and Fig. 3 is a state of the apparatus according to the embodiment before mold clamping. 4 is a sectional view showing the state of the embodiment device during mold clamping, FIG. 5 is a sectional view showing the state of the embodiment device during urethane injection, and FIG. 6 is a sectional view of the conventional headrest (resin FIG. 2 is a sectional view showing a molded product. 1... Headrest (resin molded product) 2... Outer surface portion 4... Core portions 7, 8... Stay 15... Urethane (foam) 18.19... Molding mold 36... Resin injection head 40...Hollow part patent application Nissan Shatai Co., Ltd.

Claims (1)

[Scope of Claims] 1) An outer surface portion, a core portion, and a hollow stay, the stay penetrating one side of the outer surface portion and the core portion, and between the outer surface portion and the core portion. 1. A resin molded product, characterized in that a foam is filled between the core and an outer surface of a surface other than the side surface through which the stay penetrates. 2) A hollow stay whose tip is opened in the hollow part between the mold and the core, and a resin that is connected to the base end of the stay located outside the mold and fills the hollow part with a foam. An apparatus for molding a resin molded product, comprising: an injection head.