KR101830259B1 - Shuttle forming apparatus for glazing surface of expanded material and method for forming of the same - Google Patents

Abstract

The present invention relates to a surface glazing forming apparatus (1) of an expandable material. The glazing forming apparatus (1) of the present invention comprises: a base frame (3); a mold base (5) which is mounted on one side surface of the base frame (3) so as to be movable in a lateral direction (A); a movable mold (7) which is mounted on one side surface of the mold base (5) and moved in a lateral direction along with the mold base (5) when the mold base (5) is moved in the lateral direction (A); a core mold (9) which is mounted on one side surface of the mold base (5) at a position spaced at a certain distance away from the movable mold (7) such that the core mold (9) is movable in the lateral direction (A); and a cavity mold (11) which is disposed at a position spaced apart from the mold base (5) of the base frame (3) such that the cavity mold (11) is moved forward and backward to be coupled to or separated from the movable mold (7), or coupled to or separated from the core mold (9), and into which a foaming agent raw material is injected to primarily mold the foaming agent raw material into a molded product (13) when the cavity mold (11) is coupled to the movable mold (7), and to perform a glazing treatment process on the molded product (13) when the cavity mold (11) is coupled to the core mold (9). Therefore, the glazing forming apparatus (1) according to the present invention has advantages that the process is simple and the manufacturing costs can be reduced by enabling one glazing forming apparatus to perform both a general expansion molding process and a glazing process.

Description

[0001] The present invention relates to a shuttle grazing forming apparatus and a method for forming a surface grazing of a foamable material using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for forming a surface grazing material of a foamable material, and more particularly, to a technique capable of forming both a foam molding process and a grazing process by means of a shuttle grazing molding apparatus.

Generally, lightweight materials are widely used as packaging materials for automobile parts and electronic parts, packaging materials for agricultural and marine products, household goods, thermal insulation materials, and insulating box. Expanded Poly-Propylene (EPP) and Expanded Polystyrene (EPS) are commonly used as these materials because they meet the required characteristics such as light weight, shock absorption, insulation, and thermal insulation.

In particular, EPP is an environmentally friendly plastic foam that is excellent in flexibility, cracking resistance, repellency and chemical resistance. It is mainly used in the automobile industry in various forms such as energy absorber, cushion, and packing And is also widely used as a packaging material for electronic products in the electronic industry.

Such EPP is usually produced by foam molding, for example, by filling the raw material with pressure, filling the mold, supplying steam, supplying cooling water, and taking out the product.

At this time, the raw material pressure filling process is a process of injecting beads of predetermined magnification into the bead at a predetermined pressure and time using a pressure tank facility.

The filling of the raw material in the mold can be proceeded by the foamed resin molding apparatus of the beads which have undergone the material pressure-filling process.

Such a foaming resin molding process can be carried out by various kinds of molding apparatuses. For example, the molding apparatus proposed in the Utility Model Registration Application No. 20-2007-0004761 (name: a mold for a foaming resin molding machine) .

That is, the foam resin molding apparatus comprises a fixed mold frame and a movable mold frame to which a foaming resin is supplied, a cooling water supply portion, a vapor supply portion, and a material supply portion.

At this time, the movable mold frame can be combined with or separated from the fixed mold frame by moving back and forth by the cylinder.

In this foamed resin molding apparatus, the raw material is filled in the cavity side of the mold with a feeder gun as a raw material supply port.

The steam is supplied by supplying steam at a predetermined pressure so as to fuse the raw material after the raw material is supplied, and the cavity side, the core side, and both sides are sequentially heated.

The cooling supply means cooling the inside of the mold for a predetermined time to cool the fused product. The cooling supply has a cooling form in which cooling water is sprayed directly from the back surface of the mold and directly through the back surface of the mold.

Thus, when the cooling is completed, the ejection of the product is released.

However, the conventional light weight material (EPP) manufactured in this manner has a problem in that the surface is not smooth as shown in FIG. 1 and therefore the merchantability is low.

Therefore, such lightweight materials are mainly used as inner packaging materials which do not concentrate on the appearance or lightweight materials (materials) which do not need to consider the appearance quality considerably.

In addition, the foamed foamed product produced by the above method is not used as a molded product of a building, i.e., a roof or a wall. The reason why the molded article is not used as a molded article of a building is that the molded article has small pores that are invisible so that external moisture penetrates through the pores in the thickness direction of the molded article and flows into the interior of the building .

In order to solve this problem, a method has been used in which a waterproof layer is applied or laminated on one side of a foamed foamed styrofoam formed by the above-mentioned method, and small pores exposed on one surface of the molded body are closed to prevent moisture from entering.

However, such a waterproofing operation is carried out by a separate process from the foamed styrofoam forming process, thereby increasing the manufacturing cost of the foamed foamed foamed article having a waterproof function.

Utility model registration application No. 20-2007-0004761 (Name: Molding mold for foaming resin molding machine)

It is an object of the present invention to provide a technique by which both a foam molding process and a grazing process can be performed by one shuttle grazing molding apparatus.

The present invention has been proposed in order to achieve the above-mentioned object,
A base frame (3);
A mold base 5 movably mounted on one side of the base frame 3 in the lateral direction A;
A moving mold 7 mounted on one side of the mold base 5 and moving in the lateral direction as the mold base 5 moves in the lateral direction A;
A core mold 9 mounted at a position a certain distance from the moving mold 7 on one side of the mold base 5 and movable in the lateral direction A; And
And is coupled to or separated from the moving mold 7 by engaging or disengaging with the moving mold 7 by being moved back and forth by being disposed at a position away from the mold base 5 of the base frame 3, (1) including a cavity mold (11) for injecting a foaming agent raw material to form a primary molded product (13) and to engage with the core mold (9) Lt; / RTI >

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In another embodiment of the present invention,

Positioning the mold base (5) in the lateral direction on the base frame (3) so as to be aligned with the cavity mold (11) and preparing for the foaming molding;

A step in which the cavity mold 11 advances to be hermetically sealed with the movable mold 25, and the foaming agent raw material is supplied, heated and cooled;

The cavity mold 11 is moved backward and separated from the movable mold 25, the mold base 5 is moved so that the core mold is aligned with the cavity mold 11;

The cavity mold 11 advances and is sealed with the core mold 9 to prepare for grazing;

Supplying a heating medium supplied from a boiler (19) to a flow path (17) formed between double molds (15) of the core mold (9) to heat the molded product (13);

Supplying the cooling medium supplied from the cooler (21) to the flow path (17) to cool the molded article (13); And

And withdrawing the molded product (13) by backing the cavity mold (11).

As described above, the present invention has the following advantages.

First, since the general foam molding process and the grazing process are both performed by a single grazing molding apparatus, the process is simple and the manufacturing cost can be reduced.

Second, the process can be divided to improve the quality of the primary foamed product before the grazing, and to produce a thicker grained product.

Third, it is safe to use low-pressure, high-temperature heating medium without using high-pressure steam, and it is effective in cost reduction by energy saving.

FIG. 1 is a perspective view showing a conventional molded product which has not been subjected to the graining treatment.
2 is a perspective view showing a molded product subjected to a graining treatment according to an embodiment of the present invention.
3 is a plan view schematically showing a structure of a shuttle grazing molding apparatus for performing the foaming and grazing processing of the molded article shown in Fig.
FIG. 4 is a plan view showing a process of injecting, heating, and cooling the foaming agent by the shuttle grazing molding apparatus shown in FIG.
FIG. 5 is a plan view showing a state in which the movement mold and the cavity mold of the shuttle grazing molding apparatus shown in FIG. 4 are separated.
FIG. 6 is a plan view showing a state in which the core mold moves laterally after the foam molding process of the shuttle grinding and molding apparatus shown in FIG. 5 is completed, and is arranged in line with the cavity mold to wait for the grazing process.
FIG. 7 is a plan view showing a process of heating and cooling the cavity mold of the shuttle grazing molding apparatus shown in FIG. 6 after the cavity mold is advanced and joined with the core mold.
8 is a plan view showing a state in which the cavity mold is separated from the core mold after the grazing process is completed by the shuttle grazing molding apparatus shown in FIG.
FIG. 9 is a plan view showing a state in which the moving mold moves laterally and is in the same line as the cavity mold for the general foam molding process after the grazing process is completed by the shuttle grinding and molding apparatus shown in FIG.
10 is a view showing the internal structure of the cavity mold and the core mold shown in FIG.
11 is a view showing a standby state before foaming by a general foam molding apparatus according to another embodiment of the present invention.
FIG. 12 is a view showing a state where the moving mold and the stationary mold of the general foam molding apparatus shown in FIG. 11 are integrally joined to inject, heat and cool the foaming agent raw material.
FIG. 13 is a view showing a state in which a movable mold and a fixed mold are separated from each other and a molded product is taken out after the foam molding process by the general foam molding apparatus shown in FIG. 12 is completed.
FIG. 14 is a view showing a state in which a molded article taken out after foam molding according to FIG. 13 is put into a cavity mold of a grazing molding apparatus.
Fig. 15 is a view showing a state in which the cavity mold of the grazing molding apparatus shown in Fig. 14 is integrally joined to the core mold and is heated and cooled.
16 is a view showing a state in which the cavity mold is separated from the core mold and the molded product is taken out after the grazing process is completed by the grazing molding apparatus shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a surface grinding apparatus and method of a foamable material according to an embodiment of the present invention will be described in detail.

The molding and grazing process of the foamable material, for example, the EPP molded article 13 used in the present embodiment can be carried out by a shuttle grazing molding apparatus.

That is, as shown in Figs. 2 to 10, the shuttle grinding and molding apparatus 1 includes a base frame 3; A mold base 5 movably mounted on one side of the base frame 3 in the lateral direction A; A moving mold 7 mounted on one side of the mold base 5 and moving in the lateral direction A as the mold base 5 moves in the lateral direction A; A core mold 9 mounted at a position a certain distance from the moving mold 7 on one side of the mold base 5 and movable in the lateral direction A; And is disposed at a position away from the mold base 5 of the base frame 3 and joined to or separated from the moving mold 7 by forward and backward movement or is engaged with or separated from the core mold 9, And a cavity mold 11 for injecting a foaming agent raw material into the molded article 13 to form a molded article 13 and to graze the molded article 13 when it is combined with the core mold 9.

In the shuttle grinding and molding apparatus 1 having such a structure, the mold base 5 is mounted movably in the lateral direction on one side of the base frame 3.

That is, the mold base 5 can be arranged to be movable laterally on one side of the base frame 3 by various methods. For example, a transfer device is connected to the mold base 5, (5) and the moving mold (7) move laterally along the rails on the base frame (3).

Therefore, when the conveying device is operated, the mold base 5 can move laterally along the base frame 3. [

At this time, various methods such as a hydraulic cylinder, a pneumatic cylinder and the like can be applied to the transfer device, and any transfer device that can move the mold base 5 in the lateral direction is included.

The movable mold 7 and the core mold 9 are mounted on the side surfaces of the mold base 5 to move laterally as the mold base 5 moves laterally.

The moving mold 7 may be coupled with the cavity mold 11 so that the primary molding process can proceed.

That is, the step of foaming the foaming agent raw material by the transfer mold 7 and the cavity mold to produce the molded product 13 is subjected to a four-step process such as filling, heating, cooling, and releasing as in the conventional foam molding process.

That is, as shown in FIGS. 3 to 10, the foaming agent raw material particles are injected into a mold, and then steam is supplied to fuse the expanded particles. The heated mold is cooled while being maintained at a predetermined temperature, And then the mold is demolded and dried.

Various types of blowing agents may be used as the blowing agent, for example, expanded polypropylene (EPP).

More specifically,

As shown in Fig. 3, first, the cavity mold 11 is moved to the standby position with respect to the moving mold 7. At this time, the core mold 9 is arranged at a position distant from the moving mold 7 by a certain distance.

Then, as shown in Fig. 4, the cavity mold 11 is advanced to engage with the movable mold 7 to seal it.

Then, EPP raw material particles are injected into the space between the cavity mold 11 and the movable mold 7. Preferably EPP is charged.

In this case, it is preferable to fill the raw material rapidly at a pressure of about 4 to 5 bar for 3 to 10 seconds, cracking is maintained at about 1 to 15 mm, and when the raw material supply is completed, the cracking is made zero, It is preferable to close it.

In this state, steam is injected into the mold for 2 to 3 seconds to perform preliminary heating. That is, by opening the steam supply valve, steam maintained at 140 to 150 DEG C, 3 to 4 bar supplied from the boiler 19 is supplied into the mold for 15 to 20 seconds to fuse the expanded particles.

After the molded article 13 is heated, a cooling water supply valve is opened in the cavity mold 11 and the movable mold 7 to cool the molded article 13.

At this time, the time required for the overall cooling is within a range of 80 to 120 seconds.

The one side surface of the molded product 13 closely contacting the inner surface of the cavity mold 11 in the heating step of the molded product 13 can be separated from the inner surface of the cavity mold 11 naturally .

Thus, when the cooling is completed, as shown in Fig. 5, the cavity mold 11 is moved backward, and the molding process is completed, so that the primary molded product 13 can be manufactured.

After the molded product 13 is primarily molded by the foam molding apparatus as described above, the molded product 13 is secondarily molded by the shuttle grazing molding apparatus 1 into the core mold 9 and the cavity mold 11 The grazing process is performed.

More specifically,

After the primary molding process is completed, as shown in Fig. 6, the cavity mold 11 is returned back to the original position with the molded article 13 remaining in the cavity, and the mold base 5 is moved in the lateral direction .

Then, when the core mold 9 reaches the position of the cavity mold 11, the movement is stopped and the grazing process proceeds.

That is, as shown in Fig. 7, the cavity mold 11 returned to the home position is moved forward to be coupled with the core mold 9, so that the mold is in a sealed state.

At this time, the inside of the core mold 9 is formed into a double structure. That is, a double mold 15 is further disposed inside the core mold 9, and a heating medium and a cooling medium are alternately supplied to the space (hereinafter referred to as the flow path) 17 between the double mold 15 and the core mold 9 The molded product 13 can be heated or cooled while flowing.

At this time, the space between the flow paths 17 is connected to the heating medium boiler 19 and the cooler 21, respectively.

Therefore, during heating, the heating medium is supplied from the heating medium boiler 19 and passes through the flow path 17 to heat the molded product 13 during the greasing forming process.

Further, at the time of cooling, the cooling medium supplied from the cooler 21 passes through the flow path 17, so that the molded article 13 can be cooled.

This graining process will be described in more detail. First, the heating process proceeds.

That is, as shown in Fig. 7, the mold is sealed by engaging with the core mold 9 in a state in which the molded article 13 remains in the cavity mold 11. Fig. Then, the heat medium supplied from the heat medium boiler 19 passes through the flow path 17.

The fusing layer, which can be uneven on the surface of the molded article 13 due to the foaming force in the primary foam molding step, is brought into close contact with the surface of the cavity mold 11 due to the heating medium passing through the flow path 17, It can be treated smoothly like a surface. At this time, since the micropores that can be formed on the surface of the molded product 13 are removed, the surface has a waterproof function.

The cavity mold 11 presses the molded article 13 at a constant pressure so that the surface of the molded article 13 can be smoothly formed by the pressure while the molded article 13 is heated.

When the heating process is completed in this manner, the cooling process can proceed.

That is, the cooling medium supplied from the cooler 21 to the flow path 17 of the core mold 9 passes through the flow path 17 to cool the molded article 13.

As described above, the cooled molded article 13 can be made into a product by going through a release process that is drawn out from the cavity mold 11, as shown in Fig.

When the mold-releasing process is completed, as shown in Fig. 9, the moving mold 7 is moved in the lateral direction again to be positioned on the same line as the cavity mold 11, and the primary foam molding process is performed.

By repeating this process, the foaming agent is foam-molded to produce the molded article 13, and the produced molded article 13 is subjected to the grazing treatment.

In the present invention, a double-side grinding process in which the grinding process is performed not only on one side of the molded product but also on the opposite side is also possible.

In the above description, both the foam molding process and the grazing process are performed by the single grazing molding apparatus 1. However, the present invention is not limited to this, The molded product 13 may be put into a grazing molding apparatus 1 to perform a grazing treatment.

That is, as shown in Figs. 11 to 16, the molded product 13 is firstly manufactured using the general foam molding machine 22.

At this time, the movable mold 25 and the stationary mold 23 have the same structure as a general mold, and the same process as the general foam molding process can be performed.

That is, as shown in FIGS. 11 and 12, the movable mold 25 is moved forward to be engaged with the stationary mold 23, and then the EPP particles are injected. Preferably EPP is charged.

In this state, the expanded particles are heated and fused by injecting steam into the mold.

After the molded article 13 is heated, a cooling water supply valve is opened in the movable mold 25 and the stationary mold 23 to supply cooling water to cool the molded article 13.

When the molded article 13 is cooled as described above, the molded article 13 is shrunk as a whole, so that the one side surface of the molded article 13 can be separated naturally in the heating step of the molded article 13.

Thus, when the cooling is completed, the molded product 13 is separated from the moving mold 25 and taken out as shown in Fig.

Then, as shown in Fig. 14, the molded product 13 is put into the grazing molding apparatus 1, and the graining process proceeds secondarily. At this time, the grazing process proceeds in the same manner as in the shuttle grinding and forming apparatus 1 described above.

That is, after the primary molding process is completed, the molded article 13 is inserted into the cavity mold 11.

As the cavity mold 11 advances, the mold is engaged with the core mold 9, and the mold is in a sealed state.

At this time, the inside of the core mold 9 is formed into a double structure. That is, a double mold 15 is further disposed inside the core mold 9, and a heating medium and a cooling medium are alternately supplied to the space (hereinafter referred to as the flow path) 17 between the double mold 15 and the core mold 9 The molded product 13 can be heated or cooled while flowing.

At this time, the space between the flow paths 17 is connected to the heating medium boiler 19 and the cooler 21, respectively.

Therefore, during heating, the heating medium is supplied from the heating medium boiler 19 and passes through the flow path 17 to heat the molded product 13 during the greasing forming process.

Further, at the time of cooling, the cooling medium supplied from the cooler 21 passes through the flow path 17, so that the molded article 13 can be cooled.

This graining process will be described in more detail. First, the heating process proceeds.

That is, as shown in Fig. 15, the mold is sealed by engaging with the core mold 9 in a state in which the molded article 13 remains in the cavity mold 11. Fig. Then, the heat medium supplied from the heat medium boiler 19 passes through the flow path 17.

The fusing layer which can cause the surface of the molded product 13 to be uneven due to the foaming force in the primary foam molding process can be closely adhered to the surface of the cavity mold 11 due to the heating medium passing through the flow path 17, . At this time, the fine pores that can be formed on the surface of the molded product 13 are removed, so that the surface has a waterproof function and the surface has a high strength.

The cavity mold 11 presses the molded article 13 at a constant pressure so that the surface of the molded article 13 can be smoothly formed by the pressure while the molded article 13 is heated.

When the heating process is completed in this manner, the cooling process can proceed.

That is, the cooling medium supplied from the cooler 21 to the flow path 17 of the core mold 9 passes through the flow path 17 to cool the molded article 13.

As described above, the cooled molded article 13 can be made into a product by going through a release process that is drawn out from the cavity mold 11, as shown in Fig.

On the other hand, the molded product 13 subjected to the graining treatment may form a pattern on the surface of the molded product 13. [

That is, by forming a pattern on the surface of the core mold 9, a pattern can be formed on the surface of the molded article 13 when the core mold 9 is pressed at a constant pressure on the surface of the heated molded article 13 Method.

By forming a predetermined pattern on the surface of the molded article 13 in this manner, the surface of the molded article 13 can be made more beautiful.

In the above description, the pattern is formed on the surface of the molded article 13 by the core mold 9. However, the present invention is not limited to this, and it is also possible to form the pattern by other methods.

For example, a pattern can be formed by drawing the molded product 13 surface-treated by the grazing molding apparatus 1 and then performing surface treatment by a method such as etching.

The formation of the pattern on the surface of the molded article 13 is possible in various ways.

Claims (6)

A base frame (3);
A mold base 5 movably mounted on one side of the base frame 3 in the lateral direction A;
A moving mold 7 mounted on one side of the mold base 5 and moving in the lateral direction as the mold base 5 moves in the lateral direction A;
A core mold 9 mounted at a position a certain distance from the moving mold 7 on one side of the mold base 5 and movable in the lateral direction A; And
And is coupled to or separated from the moving mold 7 by engaging or disengaging with the moving mold 7 by being moved back and forth by being disposed at a position away from the mold base 5 of the base frame 3, (1) including a cavity mold (11) for injecting a foaming agent raw material to form a primary molded product (13) and to engage with the core mold (9) . delete The method according to claim 1,
Characterized in that the mold base (5) is coupled along the rail to the base frame (3) and connected to the conveying device, thereby moving in the lateral direction (A) along the base frame (3) (1). The method according to claim 1,
The core mold (9) is provided with a double mold (15) in which a flow path (17) flows alternately with a heating medium and a cooling medium; A boiler 19 for supplying a heating medium to the flow path 17; And a cooler (21) for supplying a cooling medium to the flow path (17). The method according to claim 1,
Characterized in that a pattern is formed on the surface of the molded article (13) by forming a pattern on the surface of the core mold (9), or a pattern is formed by etching the surface of the molded article (13) (One). Positioning the mold base (5) in the lateral direction (A) on the base frame (3) so as to be aligned with the cavity mold (11) and preparing for the foaming molding;
A step in which the cavity mold 11 advances to be hermetically sealed with the movable mold 25, and the foaming agent raw material is supplied, heated and cooled;
The cavity mold 11 is moved backward and separated from the movable mold 25, the mold base 5 is moved so that the core mold is aligned with the cavity mold 11;
The cavity mold 11 advances and is sealed with the core mold 9 to prepare for grazing;
Supplying a heating medium supplied from a boiler (19) to a flow path (17) formed between double molds (15) of the core mold (9) to heat the molded product (13);
Supplying the cooling medium supplied from the cooler (21) to the flow path (17) to cool the molded article (13); And
And withdrawing the molded product (13) by the backward movement of the cavity mold (11).

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