JPS61120713A - Resin molded product and molding device thereof - Google Patents

Abstract

PURPOSE:To reduce the curing time of a foam, cooling said foam from a core part by providing the fixing device fixing the hollow stay whose tip is opened to a hollow core part, an air vent means provided in between a mold and the core part and the cooling tube connected to the stay. CONSTITUTION:A core part 17 is provided on stays 15, 16 by a partitioning part 17a with high fixing characteristics. The tips of the stays 15, 16 are opened into an upper chamber 17b, and their parts arranged in a lower chamber 17 have cooling holes 18, 19 opened. To fix the stays to stay fixing devices 23, 24, steps 20, 21 are formed at the lower parts thereof. The stay 16 has an air vent 22 at the part arranged in a hollow part 50. The cooling rubber tubes 44, 48 of a cooling device 40 are respectively connected to the steps 20, 21 of the stays 15, 16.

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 resin molding apparatus for molding the same.

(Prior Art) As a resin molded product and a molding apparatus therefor, the present applicant has proposed, for example, those shown in FIGS. 7 and 8.

In this prior art resin molded product, a hollow core portion 105 is provided inside the outer surface portion F1, and the outer surface portion F1 and the core portion 105 are provided inside the outer surface portion F1.
A hollow stay 106 and a steel 110 are provided, the tip of which penetrates one side of the core 105 and which is opened between the outer surface Fl and the core 105. The foam F2 was filled between the core portion 105 and the core portion 105.

The resin molding device includes a deriving device 101 that makes the thermoplastic resin into a cylindrical shape and brings it out from a nozzle 100, and an air blowing device 102 that is provided downward from the deriving device 101, and are provided facing each other. mold 103.
104, a core part 105 located inside the resin cylinder B in the mold 103, 104, and a hollow stay 106 and a stay 110 passing through the core part 105. It was equipped with a fixing device 108 for fixing the stay 106 of the core material 107, and a foam injection device 109 provided in the mold 104.

Therefore, when molding a resin molded product, the outer surface Fl of the resin molded product is molded by bringing the resin cylinder B into close contact with the recesses of the molds 103 and 104 by blow molding.

Then, the foam injection device 109 injects and foams the urethane foam F2 between the outer surface portion F1 and the core portion 105,
Blow molding and foam filling were performed in one molding device.

(Problems to be Solved by the Invention) However, in such conventional resin molded products, it is necessary to remove the foaming heat of the injected foam during molding, or to
It was impossible to send cooling air for cooling.

Further, in the resin molding apparatus, the following problems remain due to the foaming heat generated when the urethane foam injected into the hollow part foams.

■As the curing time of urethane foam increases, the molding cycle of resin molded products becomes longer.

■If the resin molded product is removed without sufficiently cooling the urethane foam, the outer surface of the resin molded product may be deformed.

(Means for Solving the Problems) Therefore, the present invention has been made with the aim of solving the above-mentioned problems, and in order to achieve this purpose, the first
The resin molded product of the invention has an outer surface, a hollow core, and a hollow stay, the core is located inside the outer surface, and the stay corresponds to one side of the outer surface. The means penetrates one side of the core, the tip of the stay is opened in the hollow part of the core, and an air release hole is opened between the outer surface part and the core, and the means is filled with foam, The resin molding device of the second invention includes a fixing device for fixing a hollow stay with an open tip to a hollow core portion located in a resin cylinder, a foam injection needle provided in a mold, and a foam injection needle provided in a mold. The means includes an air release means provided between the mold and the core, and a cooling pipe connected to the stay.

(Function) Therefore, in the resin molded article of the first aspect of the present invention, cooling air can be sent to the hollow core through the hollow stay and further removed, and the foaming heat can be cooled from the inside of the hollow core. can do. Moreover, in the resin molding apparatus of the second invention,
When the foam is injected from the foam injection needle between the mold and the core, the foam, which becomes hot due to the heat of foaming, can be cooled from the core through the hollow stay through the cooling pipe.

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

In describing this embodiment, the headrest molded by blow molding and the blow molding apparatus thereof will be mainly described with a focus on the molding apparatus.

First, the structure of the first embodiment shown in FIGS. 1 to 5 will be explained.

(2) is a deriving device, and since the nozzle 2 is provided, this deriving device 1 is equipped with the nozzle 2! The thermoplastic resin A is made into a continuous cylinder (referred to as a parison) and then extracted.

Reference numeral 3 denotes an air blowing device, which is provided in the nozzle 2. This air blowing device 3 blows air into the resin cylinder Al.

Reference numeral 4.5 denotes a mold, which is used to mold the outer surface E1 of the headrest E, which will be described later, in accordance with the shape of the molding recesses 6 and 7 by closing it from the left and right sides. A relief groove 9.9, which becomes a relief hole 8, is provided at a predetermined distance between the air blowing device 3 and the air blowing device 3 when they are facing each other. Relief grooves 12, 12 which serve as relief holes 10.11 at predetermined intervals between
．． 13.13 is provided.

Reference numeral 14 denotes a core material, which is composed of two hollow stays 15 and 16 and a hollow core part 17.
is molded by blow molding.

L7b and 17c are an upper chamber and a lower chamber, respectively, as a hollow portion of the core portion 17, which are divided into two upper and lower chambers by a partition portion 17a.

Incidentally, the core portion 17 is provided with a high degree of fixation to the stay 15.16 by the partition portion 17a.

Further, the stay 15.16 has a tip end that is connected to the upper chamber 17.
b, respectively, and the lower chamber 17c
Cooling holes 18 and 19 are drilled in the portions disposed in the cooling holes 18 and 19, respectively, and stepped portions 20 and 21 are formed at the lower ends for fixing to stay fixing devices 23 and 24, which will be described later. .

Further, the stay 16 has an air escape hole 22 formed in a portion disposed in a hollow portion 50, which will be described later.

Numerals 23 and 24 are stay fixing devices, respectively, for fixing the stays 15 and 16 of the core material 14, and these stay fixing devices 23 and 24 are as follows:
Fixing holes 25 and 26 into which the stepped portions 20 and 21 of the stays 15 and 16 are inserted are respectively opened and provided in the base 27.

Note that the stays 15 and 16 are connected to the stay fixing device 23.
24, the core portion 17 is located within the resin cylinder Al, and the stays 15, 16
The stepped portions 20 and 21 project below the stay fixing devices 23 and 24, respectively, for attaching cooling pipes 44 and 48, which will be described later.

Reference numeral 28 denotes a resin liquid injection needle, which has a conical tip and an injection port 30 that opens from a connecting portion 29 formed at the rear end toward the tip. The liquid injection needle 28 is provided in a hydraulic hole 31 formed in the molding recesses 6, 7 of the mold 4.5.

Reference numeral 32 denotes a resin injection head, one end of which is connected to two resin liquid tubes 33 and 34, and the other end inserted into an insertion port 35 provided in communication with the hydraulic hole 31, and connected to the connection portion. 29 is connected to an expandable rubber tube 36.

Note that the resin injection head 32 is connected to the resin liquid tube 3.
3, the urethane stock solution (liquid A) injected from the resin liquid tube 34, and the urethane stock solution (liquid B) injected from the resin liquid tube 34,
It is a mixture of

Reference numeral 37 denotes a pressure oil tube, which is inserted into an insertion port 38 provided in communication with the hydraulic hole 31, and this pressure oil tube 37 is connected to a pressure oil pipe 39.

The pressure oil tube 37 is used to force oil a fed from the pressure oil pipe 39 to the hydraulic hole 31 in order to advance the resin liquid injection needle 28.

Further, the resin liquid injection needle 28 can be moved forward by hydraulic pressure, so that when injecting the resin liquid E2, the resin liquid injection needle 28 can break the outer surface portion El and inject the resin liquid E2.

40 is a cooling device, which includes an air pressure feeding device 41 and two cooling pipes 42 and 43 connected to the air pressure feeding device 41.
a cooling rubber tube 44 connected to the cooling pipe 42; a cooling tube 46 connected to the cooling pipe 43 via a valve 45; and a switching valve 47 connected to the cooling tube 46.
The cooling rubber tubes 44 and 48 of this cooling device 40 are connected via a cooling rubber tube 48.
are connected to the stepped portions 20 and 21 of the stays 15 and 16, respectively.

Note that the valve 45 is provided with an air release hose 49.

Next, the operation of the molding apparatus of the first embodiment will be explained.

First, stays 15 and 16 of the core material 14 that have been blow-molded in advance
are fixed to each stay fixing device 2/3.24.

In addition, when fixing, each of the steps 20 and 21 of the stay 15.16 is inserted into each of the fixing holes 25 and 26 of the stay fixing devices 23 and 24. , 21 are respective stay fixing devices 23.2
It is in a state where it protrudes downward from the fixing holes 25 and 26 of No. 4.

Next, the cooling device 4 is attached to the steps 20 and 21 of the stays 15 and 16.
0 cooling rubber tubes 44 and 48 are attached respectively.

Next, as shown in FIG. 1, the heat-softened resin is drawn out from the nozzle 2 of the drawing device 1 in a cylindrical shape, and then, when the resin cylinder A1 is drawn out below the molds 4 and 5, The extraction is stopped, and as shown in FIG. 2, the molds 4 and 5 are closed from the left and right sides, and the stays 15 and 16 are bonded and fixed inside the resin cylinder Al.

Then, air is blown into the interior of the resin cylinder Al from the air blowing device 3, but the cooling device 40 is The switching valve 47 is closed and the cooling rubber pipe 48 and the cooling tube 46 are blown in a state where they are not communicated with each other.

As shown in FIG. 2, the blown air causes the resin cylindrical body A1 to expand and is molded in pressure contact with the walls of the molding recesses 6 and 7 of the mold 4.5, and in this molded state, the temperature gradually decreases and hardens, forming the outer surface El of the Heladless) H as a molded product.

Next, the switching valve 47 of the cooling device 40 is opened to connect the cooling rubber tube 48 and the cooling tube 46, and the valve 45 is opened to connect the cooling tube 46 and the atmosphere release hose 49.
communicate with.

Then, as shown in FIG. 3, oil a is force-fed from the pressure oil tube 37 to the hydraulic hole 31, the oil pressure in the hydraulic hole 31 is raised, and the resin liquid injection needle 28 is moved forward, and the resin liquid injection needle 28 is used to The portion El is broken so that the resin liquid injection needle 28 protrudes into the hollow portion 50 between the outer surface portion El and the core portion 17.

Then, the resin liquid E mixed by the resin injection head 32
When E 2 is injected into the hollow portion 50 through the injection port 30 of the resin liquid injection needle 28 and foamed, the foam E 3 gradually becomes hot due to the heat of foaming during foaming.

Moreover, the air in the hollow part 50 is removed from the air release hole 2 of the stay 16.
2 through the stay 16 and released into the atmosphere from an atmosphere release hose 49.

When the release to the atmosphere is completed, the valve 45 is switched again to connect the cooling tube 46 and the cooling vibe 43.

Next, when the air pumping device 41 of the cooling device 40 is operated, air is pumped to the air pumping device 41 → the cooling pipe 43 → the cooling tube 46 → the cooling rubber tube 48 → the stay 16.

The air fed to the stay 16 is then fed under pressure from the cooling hole 19 of the stay 16 to the lower chamber 17c of the core section 17, and is also forcedly sent from the tip of the stay 16 to the first chamber 17b of the core section 17 through the core section 17. This removes the foaming heat of the foam E3, which is transferred to the foam body E3.

The air in the lower chamber 17c of the core 17 is recovered from the cooling hole 18 of the stay 15, and the air in the upper chamber 17c of the core 17 is recovered from the cooling hole 18 of the stay 15.
7b is recovered from the tip of the stay 15, and the recovered air is force-fed to the stay 15=cooling rubber tube 44→cooling pipe 42→air pressure feeding device 41, and again from the air pressure feeding device 41 to the cooling vibe. 43→Cooling tube 46→
It is circulated under pressure from the cooling rubber tube 48 to the stay 16 to the core 17.

In this manner, by the circulation of air within the core portion 17 by the cooling device 40, the foaming heat of the foam E3 is gradually absorbed by the cooling air, and the foam E3 is hardened.

After the foam E3 has hardened, the cooling rubber pipe 44.4 of the cooling device 4o is connected to the steps 20, 21 of the stay 15.16.
8, open the mold 4.5, remove the stays 15.16 from the stay fixing devices 23.24, and take out the headrest E.

Next, a second embodiment shown in FIG. 6 will be described.

In this embodiment, an air vent tube 51 whose tip end is disposed in a hollow portion 50 and whose rear end protrudes from the mold 4.5 is attached to the core material 1.
This is an example in which it is provided on the stay 16 of No. 4.

Therefore, the resin liquid E is injected into the hollow part 50 from the resin liquid injection needle 28.
2, the air in the hollow part 50 is removed from the air vent pipe 5.
1, it can be released into the atmosphere.

Note that the other configurations and operations of the second embodiment are the same as those of the first embodiment, so their explanation will be omitted.

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 even if there are design changes within the scope of the gist of the present invention. included.

For example, the molding device is not limited to a blow molding device, but may be another resin molding device.

In addition to air, the material to be circulated within the core may be water, water vapor, or the like.

Furthermore, the foam is not limited to urethane foam.

Other foams may also be used.

In addition, the resin liquid injection needle may be configured to be movable back and forth.
In addition to the hydraulic method, a link mechanism, a cam mechanism, etc. may be used as the means for this purpose.

(Effects of the Invention) As explained above, according to the resin molded product and its molding apparatus of the present invention, the foam can be cooled from the core, so the curing time of the foam can be shortened, and Therefore, the molding cycle of resin molded products can be shortened, and also the mass production of resin molded products can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a blow molding device according to the first embodiment of the present invention, Fig. 2 is a sectional view showing the state of the embodiment device during mold clamping, and Fig. 3 is a sectional view showing the embodiment device during resin liquid injection. 4 is a sectional view taken along the line I-1 in FIG. 3, FIG. 5 is a sectional view showing a headrest manufactured by the apparatus of the embodiment, and FIG. 6 is a sectional view of the headrest according to the second embodiment of the present invention. FIG. 7 is a sectional view showing a blow molded product filed by the present applicant as a prior art, and FIG. 8 is a sectional view showing the same blow molding device. 4.5...Mold 15.16...Hollow stay 17...Core 22...Air release hole (air release means) 23.24...
・Stay fixing device (fixing device) 28... Resin liquid injection needle (foam injection needle) 44. 48... Cooling rubber tube (cooling tube) 51... Air relief tube (air relief means) AI...・Patent application for resin cylinder body Nissan Shatai Co., Ltd.

Claims (1)

[Claims] 1) It has an outer surface, a hollow core, and a hollow stay, the core is located inside the outer surface, and the stay corresponds to one side of the outer surface. It penetrates one side of the core, the tip of the stay is opened in the hollow part of the core, and an air release hole is opened between the outer surface and the core, and it is also filled with foam. Resin molded products. 2) A fixing device that fixes a hollow stay with an open tip to a hollow core located in a resin cylinder, a foam injection needle provided in a mold, and a space between the mold and the core. A resin molding apparatus comprising: an air release means provided in the stay; and a cooling pipe connected to the stay.