JPH0825394A - Beads foam molding method and mold used therein - Google Patents

Abstract

PURPOSE:To obtain a large-sized or long product without performing thermal fusion or adhesion after molding by molding a part of the inner surface of a mold demarcating a molded product cavity by a molded product and subsequently molding a separate molded product using the mold. CONSTITUTION:A part of a first molded product 11 being a preformed beads foamed molded product is inserted in the opening 2 of a mold 3. By this method, a part of the inner surface of the mold 3 demarcating molded product cavity 4 is molded by the first molded product 11. Beads are supplied into the molded product cavity 4 and steam is further sent into the cavity 4 to perform beads foam molding to mold a second molded product 12 and, at the same time, the first and second molded products 11, 12 are integrally fused and connected to obtain an integrally connected molded product 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead foam molding method suitable for obtaining a large or long molded product and a mold used for the method.

[0002]

2. Description of the Related Art Since bead foam molding is a method of molding a molded product by foaming in a mold, the size of the molded product to be obtained is limited by itself, and a large product or a long product can be directly processed. It has not been obtained by bead foam molding. In the case of obtaining a large or long product by bead foam molding, a plurality of molded products obtained by bead foam molding are integrated by heat fusion, adhesion, etc. after molding.

[0003]

However, if a plurality of molded products obtained by bead foam molding are integrated after molding by heat fusion, adhesion, etc., the number of steps is increased and the manufacturing cost is increased. However, there is an unavoidable problem of insufficient joint strength and deterioration of appearance due to joint marks.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to obtain a large-sized or long-sized product by bead foam molding without heat fusion or adhesion after molding. The purpose is to do.

[0005]

To this end, the invention according to claim 1 has an opening 2 for opening a part of a preformed first molded product 1 ₁ into a molded product cavity 4 outside the mold 3. After being inserted into the opening 2 of the mold 3 to form a part of the inner surface of the mold 3 that defines the molded product cavity 4 with the first molded product ₁₁ , the second molded product 1 is formed using the mold 3. by molding _2, in which is set to obtain first molded article 1 ₁ and the integral connecting moldings 5 of the second molded article 1 ₂ (see Figure 1).

Further, according to the invention of claim 6, the flat steam blowing plates 6a, 6b are attached to the front surfaces of both master frames 7a, 7b so that the front surfaces thereof are flush with each other, and one of the master frames is also installed. The side 7a or 7b is attached with an attachment plate 8 which is sandwiched between the vapor blowing plates 6a and 6b during mold clamping and which divides the side circumference of the molded product cavity 4, and a part of the attachment plate 8 is cut out, The molded product cavity 4 serves as an opening 2 that is opened to the outside of the mold 3 (see FIG. 10).

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, one embodiment of the invention of claim 1 will be described with reference to FIG.

The mold 3 used in the present invention will be described in detail later with reference to FIG. 10. However, as shown in particular in FIG. 1A, the molded product cavity 4 is placed outside the mold 3. It has an opening 2 for opening. In FIG. 1, 6
a and 6b are vapor blow-off plates through which vapor can pass, 7
Reference numerals a and 7b are master frames, reference numeral 8 is an attachment plate that is sandwiched between the steam blowing plates 6a and 6b and divides the side circumference of the molded product cavity 4, and 12a and 12b.
Is the back plate.

The bead foam molding is carried out using the mold 3 as described above. Prior to the molding, as shown in FIG. 1 (b), the first molded article 1 which is a bead foam molded article which has been preformed. Insert a part of ₁ into the opening 2 of the mold 3.

[0010] The first insertion of the molded article 1 ₁ of the opening 2 may be closed mold 3 after performing an open state of the mold 3, but may be performed from the outside after closing of the mold 3 , Mold 3
It is preferable to perform this in an open state because it is easier to adjust the insertion depth into the molded product cavity 4 side.

The first molded product 1 ₁ may be molded in advance with another mold, but when the molded product has the same shape as the second molded product 1 ₂ described later, it is indicated by a dotted line in FIG. As shown, this can be obtained by attaching a detachable closing member 9 to the opening 2 portion of the mold 3 and performing bead foam molding with the opening 2 closed.

The opening 2 is formed so as to correspond to the size and shape of the portion of the first molded product 1 ₁ to be inserted into the opening 2 so as not to cause excessive steam leakage during molding.
By inserting a part of the first molded product 1 ₁ into this opening 2,
A part of the inner surface of the mold 3 that defines the molded product cavity 4 is formed by the first molded product 1 ₁ . That is, the molded product cavity 4
Is formed by the inner surface of the mold 3 and a part of the first molded product 1 ₁ .

In the state shown in FIG. 1 (b), beads are supplied into the molded product cavity 4 and steam is further sent to carry out foaming and molding of beads. The molding conditions are the same as those for ordinary bead foam molding, but the first molded product 1 ₁ is prevented from being extruded by the vapor pressure applied in the mold 3.
It is preferable to hold ₁ .

When the above molding is carried out, as shown in FIG. 1 (c), the second molded product 1 ₂ is molded, and at the same time, the first molded product 1 ₁ and the second molded product 1 ₂ are melted together. Since they are attached, the integrally connected molded product 5 in which both are integrally connected can be obtained.

As shown in FIG. 3, the integrally connected molded product 5 may be composed of a first molded product 1 ₁ and a second molded product 1 ₂ having the same size and shape as shown in FIG. Alternatively, the first molded product 1 ₁ and the second molded product 1 ₂ having different sizes and shapes may be used. When forming an integrally connected molded product 5 consisting of a first molded product 1 ₁ and a second molded product 1 _{2 of} different sizes and shapes, the opening 2 is formed to match the first molded product 1 ₁ and the molded product cavity 1 ₂ May be formed according to the second molded product 1 ₂ .

In FIGS. 1 to 3, an integrally connected molded product 5 consisting of a first molded product 1 ₁ and a second molded product 1 ₂ respectively.
As described above, a part of the integrally connected molded product 5 is further inserted into the opening 2 of the mold 3 and the same molding is repeated, whereby the integrally connected molded product as shown in FIG. 4 and FIG. 5 can be obtained.

That is, the first molded product 1 ₁ to the n-th molded product 1 _n
By inserting a part of the integrally connected molded product 5 (n is an integer of 2 or more) into the opening 2 of the mold 3 to mold the n + 1th molded product 1 _{n + 1} , the first molded product 1 ₁ to n + 1 Article 1 _{n + 1}
Can be integrally connected to form an integrally connected molded product 5. In such molding, the first molded product 1 ₁ to the n + 1th molded product 1 _{n + 1} are made into similar plate- or rod-shaped molded products, and a long series of plate- or rod-shaped products as shown in FIG. It is effective when getting.

Further, the insertion portion of the integrally connected molded product 5 into the opening 2 and the (n + 1) th molded product 1 integrally connected to this portion.
By using the mold 3 in which the size and shape of the opening 2 and the molded product cavity 4 are changed according to _{n + 1} , as shown in FIG.
The molded product 1 _{n + 1} may be a product integrally connected.

As shown in FIG. 6, when the joint groove 10 is formed on the insertion side of the first molded product 1 _{1 into} the opening 2 (see FIG. 1), the strength of the joint can be improved. preferable. This is the integrally connected molded product 5 of the first molded product 1 ₁ to the n-th molded product 1 _n and the n + th molded product described in FIGS. 4 and 5.
The same applies to the joining between one molded product and 1 _{n + 1} .

In FIG. 1, the case where the opening 2 is provided at one place in the mold 3 has been described as an example, but the opening 2 can be provided at two or more places. The opening 2 is provided position is any at the position where the second molded article 1 ₂ to the (n + 1) molded article 1 _{n + 1} of the extraction taken out is integrated with the first molded article 1 ₁ or integrally connected moldings 5 is not prevented It may be provided, for example, in a direction along the opening / closing direction of the mold 3, or by notching the parting surface of the mold 3. The opening 2 shown in FIG. 1 is formed by notching the parting surface of the mold 3.

Next, with reference to FIG. 7, an embodiment in which the openings 2 are provided at two opposite positions of the mold 3 will be described. In FIG. 7, the same reference numerals as those in FIG. 1 indicate the same members.

As clearly shown in FIG. 7A, the mold 3
Have openings 2 at two locations facing each other.

First, the first molded product 1 ₁ is inserted into each opening 2 as shown in FIG. 7 (b). As described with reference to FIG. 1, a part of the inner surface of the mold 3 that defines the molded product cavity 4 is formed by each of the first molded products 1 ₁ by this insertion.

In the state of FIG. 7 (b), similarly to the description with reference to FIG. 1, beads are supplied into the molded product cavity 4 and steam is further sent to perform foam molding of beads.

When the above-mentioned molding is performed, as shown in FIG. 1 (c), the second molded product 1 ₂ is molded, and at the same time, the first molded product 1 ₁ and the second molded product 1 ₂ are integrally melted. It is possible to obtain an integrally connected molded product 5 in which the first molded product 1 ₁ is integrally bonded to both sides of the second molded product 1 ₂ attached.

As shown in FIG. 9, the integrally connected molded product 5 may be composed of a first molded product 1 ₁ and a second molded product 1 ₂ having the same size and shape as shown in FIG. Alternatively, the first molded product 1 ₁ and the second molded product 1 ₂ having different sizes and shapes may be used. Further, according to the description in FIGS. 4 and 5, a part of the integrally connected molded product 5 of the first molded product 1 ₁ to the n-th molded product 1 _n is inserted into both openings 2 of the mold 3 and the n +
By molding 1 molded product 1 _{n + 1} , the first molded product 1 ₁
~ The n-th molded product 1 _n can be an integrally connected molded product 5 that is continuous on both sides of the _{n + 1-th} molded product 1 _{n + 1} .

Next, an embodiment of the invention of claim 6 is shown in FIG.
Through FIG.

In FIG. 10, 7a and 7b are fixed side and moving side master frames, 11 is a raw material feeder, 1
Reference numerals 2a and 12b are back plates, 13 is an ejector pin, 14 is a sealing material, and 15 is a reinforcing support. These are the same as those of a conventional bead foam molding die.

Flat steam blowing plates 6a and 6b are attached to the front sides of the master frames 7a and 7b (the molded product cavity 4 side), respectively. The vapor blowing plates 6a and 6b have vapor permeability,
As shown in FIG. 11, the core vent 16 has a vent hole 17 driven therein.

The vapor blowing plates 6a and 6b in this embodiment are mounted so as to be fitted inside the master frames 7a and 7b, respectively. Further, as clearly shown in FIG. 11, the front surfaces of both steam blowing plates 6a and 6b are flush with the front end surfaces A and B of the master frames 7a and 7b, respectively. Therefore,
The front sides of both vapor blowing plates 6a and 6b are each flat.

An attachment plate 8 is further attached to the fixed master frame 7a. This attachment plate 8 is, as shown in FIG.
It has a U-shape with one side open. As shown in FIG. 10, the attachment plate 8 is sandwiched between the steam blowing plates 6a and 6b during mold clamping to define the side circumference of the molded product cavity 4, and the open side portion thereof is It becomes the opening 4.

The attachment plate 8 is preferably removable. In this way, by simply opening the mold 3 and exchanging the attachment plate 8, the molds 3 having different sizes of the openings 4 can be formed, and molded products having different shapes or thicknesses can be molded. . That is, by changing the attachment plate 8 with one having a different width of the opening 4 or one having a different inner contour and thickness, it is possible to change the width of the opening 4 or form a molded product having a different shape and thickness. You can

Although the attachment plate 8 in this embodiment is attached to the fixed side master frame 7a side, when the ejector pin 13 is projected from the moving side to the fixed side, the attachment plate 8 is attached to the moving side master frame 7b side. It can also be attached. Further, the attachment plate 8 may be divided into two or more, instead of the one plate notched as shown in FIG. Furthermore, it is also possible to attach the attachment plates 8 to both the fixed-side and moving-side master frames 7a and 7b, and align the two attachment plates 8 during mold clamping to form one molded product cavity 4.

The closing member 9 shown in FIG. 12 is the same as that shown in FIG.
However, as described above, it is used when the bead foam molding is performed with the opening 2 closed.

Next, another attachment state of the attachment plate 8 will be described with reference to FIG. In FIG. 13, the same reference numerals as those in FIGS. 10 to 12 indicate the same members.

The steam blowing plate 6 in this embodiment
The a and 6b are attached so as to cover the front end surfaces A and B of the master frames 7a and 7b, respectively, so that the front surfaces of both the steam blowing plates 6a and 6b are flush with each other.

In this way, the steam blowing plates 6a, 6
If b is attached, the front surface and both master frames 7a and 7b when attaching the steam blowing plates 6a and 6b.
There is an advantage that the front end faces A and B need not be aligned one by one.

[0038]

EFFECTS OF THE INVENTION The present invention is as described above, and by the bead foam molding, a large or long product can be obtained without heat fusion or adhesion after molding.
While increasing the manufacturing efficiency of these products,
Since it is close to integral molding, the strength and appearance can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a bead foam molding method according to the present invention.

FIG. 2 is a perspective view showing an example of an integrally connected molded product obtained by the method of FIG.

FIG. 3 is a perspective view showing another example of an integrally connected molded product obtained by the method of FIG.

FIG. 4 is a perspective view showing an example of an integrally connected molded product obtained by repeating the method of FIG.

FIG. 5 is a perspective view showing another example of an integrally connected molded product obtained by repeating the method of FIG.

FIG. 6 is a perspective view showing an example of a joining groove.

FIG. 7 is an explanatory view showing another embodiment of the bead foam molding method according to the present invention.

FIG. 8 is a perspective view showing an example of an integrally connected molded product obtained by the method of FIG.

9 is a perspective view showing another example of the integrally connected molded product obtained by the method of FIG. 7. FIG.

FIG. 10 is a cross-sectional view showing an embodiment of a bead foam molding die according to the present invention.

FIG. 11 is an enlarged cross-sectional view near the attachment portion of the attachment plate.

FIG. 12 is a perspective view of an attachment plate.

FIG. 13 is a cross-sectional view showing another attachment state of the attachment plate.

[Explanation of symbols]

1 ₁ to 1 _{n + 1} 1st molded product to n + 1th molded product 2 Opening 3 Mold 4 Molded product cavity 5 Integrated connection molded product 6a, 6b Steam blowing plate 7a, 7b Master plate 8 Attachment plate 9 Closing member 10 Joining groove 11 Raw material feeder 12a, 12b Rear plate 13 Ejector 14 Sealing material 15 Reinforcement support

Claims (8)

[Claims] 1. A part of a preformed first molded product is inserted into the opening of a mold having an opening for opening the molded product cavity to the outside of the mold, and the inner surface of the mold defining the molded product cavity is inserted. It is characterized in that an integrally connected molded product of the first molded product and the second molded product is obtained by molding a second molded product using the mold after forming a part of this first molded product. Bead foam molding method. 2. A first molded product to an n-th molded product (n is an integer of 2 or more), a part of an integrally connected molded product is inserted into an opening of a mold to mold an (n + 1) th molded product. The bead foam molding method according to claim 1, wherein an integrally connected molded product of a molded product to an (n + 1) th molded product is obtained. 3. A mold is provided with openings at two locations facing each other, and a second molded product is molded by inserting a part of a preformed first molded product into both openings of the mold. Due to
The bead foam molding method according to claim 1, wherein an integrally connected molded product is obtained by integrally connecting the first molded product to both sides of one second molded product. 4. An n + 1th foamed molded article is molded by inserting a part of an integrally connected molded article of a first molded article to an nth molded article into both openings of a mold to mold an n + 1th foamed molded article. The bead foam molding method according to claim 3, wherein an integrally connected molded product is obtained by integrally connecting the first molded product to the n-th molded product on both sides. 5. The first molded product to the (n + 1) th molded product are all similar plate- or rod-shaped molded products, and the integrally connected molded product is a series of plates or rods. Any bead foam molding method. 6. A flat steam blowing plate is attached to each of the front surfaces of both master frames so that the front surface thereof is flush with each other, and one of the master frames is equipped with both steam discharging plates at the time of mold clamping. An attachment plate that is sandwiched between them and divides the side circumference of the molded product cavity is attached, and a part of this attachment plate is cut out to form an opening that opens the molded product cavity to the outside of the mold. A mold for bead foam molding, which is characterized in that 7. The molded product cavity has a shape for molding a plate-shaped or rod-shaped molded product, and one side or one end of this molded product cavity is an opening. Mold for bead foam molding. 8. The molded product cavity has a shape for molding a plate-shaped or rod-shaped molded product, and the two opposite sides or both ends of the molded product cavity are openings. Item 6. A bead foaming mold of item 6.