KR101863001B1 - Injection foaming apparatus - Google Patents

Injection foaming apparatus Download PDF

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Publication number
KR101863001B1
KR101863001B1 KR1020170119742A KR20170119742A KR101863001B1 KR 101863001 B1 KR101863001 B1 KR 101863001B1 KR 1020170119742 A KR1020170119742 A KR 1020170119742A KR 20170119742 A KR20170119742 A KR 20170119742A KR 101863001 B1 KR101863001 B1 KR 101863001B1
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KR
South Korea
Prior art keywords
foamed
foaming
unit
foamed material
injection
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KR1020170119742A
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Korean (ko)
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이주용
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이주용
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Priority to KR1020170119742A priority Critical patent/KR101863001B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/422—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum by injecting by forward movement of the plastizising screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/424—Details of machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/60—Measuring, controlling or regulating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The present invention relates to an injection foam molding apparatus for injection molding a foam material containing EVA, PVC, PE, and PP by injection injection, and more particularly, to an injection foam molding apparatus in which one or more kinds of foaming materials selected from EVA, PVC, PE, A foaming material input part for inputting a material and a foaming agent; A foaming material injected from the foaming material injecting unit and a foaming agent are mixed and melted, and the foaming material injected into the foam molding die unit through the nozzle unit is injected to the inside of the nozzle unit, An injection section; A foam molding die for blowing and molding a mixed foamed material containing a foaming agent by heating the foamed foamed material from the foamed material injection part at a predetermined temperature, pressure and time; A first heating part for melting the foamed material including the foaming agent injected into the inside by heating the foamed material injection part; And a second heating unit for performing a foaming process on the molten mixed foamed material injected into the inside by heating the foamed molding die unit, wherein the foamed molding die unit comprises a foamed material injection unit, A first mold having a female or male first cavity forming part of a predetermined shape for forming a cavity for a molding space in which an inflow hole is formed; And a second metal mold corresponding to the first metal mold, wherein a second cavity forming portion of a male or female structure corresponding to the first cavity forming portion is formed to face the first cavity forming portion, The first cavity forming part and the second cavity forming part are provided as a block-shaped body separated from the first mold and the second mold, respectively, so that when the shape of the foamed molded product to be foamed by the mixed foamed material is changed, And the first cavity forming part and the second cavity forming part can be replaced and used.
According to the present invention, it is possible to prevent a mixture of the foamed material and the foaming agent from being partially foamed before molding, to supply a uniform mixed foamed material to the mold side, and to increase the efficiency in foam molding to produce a foamed molded article of good quality It is possible to provide a usefulness of selecting the timing of introduction of the blowing agent, if necessary.

Description

{INJECTION FOAMING APPARATUS}

The present invention relates to an injection foam molding apparatus and method, and more particularly, to an injection foam molding apparatus and method that prevent a mixture of a foam material and a foaming agent from being partially foamed before molding, In addition, it is possible to partially replace only the cavity side without replacing the entire mold when changing the shape of the foamed molded article by improving the structure of the cavity, which is a space for molding the foamed molded article, To a molding apparatus.

Generally, foam molding is a process for producing a foamed molded product by injection molding or extrusion molding of various plastic polymeric resin materials. In the process of performing injection molding or extrusion molding, foaming is performed to produce bubbles in a molding structure of a polymer resin, And the product is uniformly dispersed in the molding tissue of the mold.

As described above, the foamed molded product manufactured by the foam molding has a large volume of bubbles due to foaming, and thus can be reduced in weight as well as material cost, and can be made to have heat insulation and elasticity through bubble formation by foaming You can provide the advantages that you have.

In the foam molding, usually a chemical foaming agent or a physical foaming agent is used in accordance with the release mechanism of the gas used for forming the foam of the foaming agent. The chemical foaming agent is a form in which gas is released by thermal decomposition or chemical reaction, , Physical foaming agent is a form of gasification mainly in the form of evaporation, desorption, etc., without chemical change, and most of liquid substances are used in most cases.

Usually, foamed injection molding is performed by injecting a foamed material such as a resin, a foaming agent, and other additives in advance, injecting the foamed material into the foamed material under high pressure, injecting the foamed material into an appropriate position of a cylinder body for melting the foamed material, The mixture of the foaming material and the foaming agent thus injected is injected into a cavity, which is a molding space in the mold, and foam is generated while the generated gas expands.

The technique of using the physical foaming agent in the foaming injection molding may use a harmless gas such as carbon dioxide or nitrogen, distribute the bubbles evenly throughout the molding, and provide the advantage of reducing the size of the bubbles. A physical blowing agent (gas blowing agent) is supplied to the molten polymer resin and mixed, and the screw inside the cylinder body is rotated to push out the mixture of the polymer resin and the gas, thereby generating a pressure difference, .

In the foam injection molding using such a physical foaming agent, it is important to uniformly mix the molten foamed material and the physical foaming agent (gas foaming agent), and at the same time to maintain a uniformly mixed state so that foaming does not occur partially before molding .

US Patent No. 7,198,748 proposes and discloses an injection molding apparatus for mixing a molten resin and a gas blowing agent in a barrel. The injection molding apparatus includes a screw provided in the cylinder body and provided with a permeable portion on the outer circumferential surface, a blowing agent supply portion for supplying the blowing agent, And a cutting member and a mixing member connected to an end of the mixing member. In such an injection molding apparatus, the blowing agent is supplied to the permeable portion provided on the outer peripheral surface of the screw through the bore formed in the screw, the blowing agent supplied to the permeable portion is injected into the molten resin in the cylinder, mixed with the molten resin in the cylinder , The mixture in which the foamed material and the foaming agent are mixed is mixed while passing through the cutting member and the mixing member and injected into the mold.

However, in the conventional injection molding apparatus, the molten foamed material as the high viscosity fluid and the gas foaming agent having the low viscosity are mixed, and the state of the molten mixture is stabilized by maintaining the conditions such as pressure and temperature for a predetermined time It is necessary to keep the mixture in the molten state for a certain period of time before discharging the mixture to the outside. However, since the pressure loss due to the pressure difference occurring at the interface is generated even if the pressure is kept constant, To form a molten state mixture. If the resin is extruded or injected and filled in the cavity of the mold, the resin is foamed to the outer surface of the molded product, and thus the surface of the molded product is roughened and the strength is lowered.

Particularly, when a partially foamed molten mixture is injected, a part of the gas already foamed in the injection process leaks to the outside, making it difficult to produce a molded article having a uniform expansion ratio, and a partially foamed molten mixture is injected into the cavity The pressure required for filling becomes higher than the pressure required for filling the molten mixture which is partially unfoamed, and if the molten foam material is charged at a high pressure, the excessive molten foam material is filled, which lowers the expansion ratio .

In addition, since the partially foamed molten expanded material is uneven in the foaming state, there is a problem that it is difficult to continuously and stably maintain the production process, and the defective rate is high.

U.S. Patent No. 7,198,748 Korean Patent Registration No. 10-1664916

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the foregoing problems, and it is an object of the present invention to provide a method for manufacturing a foamed molded article, And it is an object of the present invention to provide an injection foam molding apparatus capable of preventing the strength from being lowered.

It is an object of the present invention to provide an injection foam molding apparatus capable of increasing the efficiency in foam molding to produce a foamed molded article of good quality and, when necessary, selecting the injection timing of the foaming agent.

The present invention improves the structure of a foam molding mold, which is a space for molding a foamed molded article, to a removable structure, so that only the cavity side can be partially used without replacing the mold as a whole when changing the shape of the foamed molded article, The present invention has been made in view of the above problems.

According to an aspect of the present invention, there is provided an injection foam molding apparatus for injecting and foaming a foamed material containing EVA, PVC, PE, PP, and a foaming agent, PE, and PP, and a foaming agent; A foaming material injected from the foaming material injecting unit and a foaming agent are mixed and melted, and the foaming material injected into the foam molding die unit through the nozzle unit is injected to the inside of the nozzle unit, An injection section; A foam molding die for blowing and molding a mixed foamed material containing a foaming agent by heating the foamed foamed material from the foamed material injection part at a predetermined temperature, pressure and time; A first heating part for melting the foamed material including the foaming agent injected into the inside by heating the foamed material injection part; And a second heating unit for heating the foamed molding die unit to perform a foaming process on the molten mixed foamed material injected into the cavity, wherein the foamed material injection unit has a spherical shape rotatably installed in the nozzle part of the cylinder, The spherical rotating body is a spherical body having an empty interior. The spherical rotating body is formed with a plurality of openings over the entire circumferential surface forming the spherical body, And the foaming agent pass through the through-hole.

Here, the foamed material injection portion is a cylindrical body connected to the foamed material input portion. The foamed material injection portion is a cylindrical body, which is used for mixing and melting the foamed material injected from the foamed material input portion and the foaming agent, and injecting the melted mixed foamed material A cylinder having a nozzle portion; And an extrusion screw which is installed in the cylinder and is coupled to the rotation driving motor so as to push the mixed foamed material toward the nozzle unit side, the cylinder having a first jacket portion having a double jacket structure with respect to the outer wall, Wherein the first jacket portion is positioned in an inner direction of an outer wall of the cylinder and the second jacket portion is disposed in close contact with an outer direction of the first jacket portion; The first heating unit may be configured to supply steam to the first jacket unit to heat the cylinder, and the second jacket unit may cool the cylinder by supplying air or gas cooling fluid to the second jacket unit.

And a foaming agent injecting unit for injecting the foaming agent into the nozzle part side of the foamed material injection part without mixing the foaming agent into the foamed material injection part on the foamed material injection part, The control unit detects the number of revolutions of the rotary drive motor or mounts the detection sensor at the boundary point with the in-cylinder nozzle unit and transmits the detection signal to the control unit; The control unit may control the blowing agent injecting unit when the foamed material flows into the nozzle unit by the detection signal or the sensing signal so that the foaming agent is mixed into the individual injection and foamed materials to the nozzle side.

Here, the first heating unit uses a heating method by steam supply, and the foaming material is heated so as to maintain a temperature of 80 to 110 DEG C with respect to the foaming material injection unit, so that the melting of the foamed material to be melted in the foaming material injection unit And the second heating unit heats the foamed metal mold part so as to maintain a temperature of 145 to 220 ° C to foam and mold the molten foamed material, The forming mold section is configured to perform a foaming molding process in two steps at a temperature of 145 to 180 DEG C and a pressure of 120 to 150 kgf / cm < 2 > For 5 to 10 minutes, and then subjected to secondary treatment for 10 to 20 minutes at a temperature of 180 to 220 DEG C and a pressure of 150 to 200 kgf / cm < 2 >.

Here, the foam molding die may include: a first mold having a female or a first type cavity forming portion having a predetermined shape for forming a cavity for a molding space, the cavity having a material inlet hole communicating with the nozzle portion of the foamed material injection portion; And a second metal mold corresponding to the first metal mold, wherein a second cavity forming portion of a male or female structure corresponding to the first cavity forming portion is formed to face the first cavity forming portion, The first cavity forming part and the second cavity forming part are provided as a block-shaped body separated from the first mold and the second mold, respectively, so that when the shape of the foamed molded product to be foamed by the mixed foamed material is changed, Only the first cavity forming portion and the second cavity forming portion can be replaced and used.

Here, the second heating unit is an electric heater or a steam supply unit; In the case of the steam supply device, the foam molding die part has a first jacket part and a second jacket part formed inside each of the first mold and the second mold, and the second jacket part is formed in close contact with the outer side of the first jacket part, Supplying steam to the first jacket portion to heat the foam molding die portion; The second jacket portion may be configured to cool the foam molding die portion by being connected to a cooling fluid supply device for supplying a cooling fluid of air or gas.

Here, the foam material injecting unit may include a charging hopper coupled to a rear end of the foam material injecting unit; A scale hopper having at least two load cells disposed above the loading hopper and having a load cell for supplying a foaming agent including a foaming material in a predetermined amount; And a foaming material supply induction plate disposed on the lower side of the scale hopper on which the two or more are installed and disposed to be inclined and guiding the foaming agent including the foaming material supplied from the scale hopper to the loading hopper side .

According to the present invention, it is possible to prevent a mixture of the foamed material and the foaming agent from being partially foamed before molding, to supply a uniform mixed foamed material to the mold side, to increase the efficiency in foam molding, Usefulness can be achieved.

 INDUSTRIAL APPLICABILITY The present invention can provide a foamed molded article having good surface condition and maintaining a constant strength, and can provide ease of use and economical efficiency, and can be useful in selecting the time for introducing the foaming agent, if necessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic overall configuration diagram showing an injection foaming and molding apparatus according to an embodiment of the present invention. FIG.
Fig. 2 is a view showing a configuration including a cylinder side double jacket structure in an injection foam molding apparatus according to an embodiment of the present invention.
3 is a schematic cross-sectional view showing a foam molding die portion in an injection foam molding apparatus according to an embodiment of the present invention.
4 is a view showing a configuration including an individual blowing agent introduction portion in an injection foam molding apparatus according to an embodiment of the present invention.
FIG. 5 is a block diagram showing a control relationship with respect to a configuration of an essential part in an injection foam molding apparatus according to an embodiment of the present invention.
6 is an exemplary view showing another configuration of a foamed material injection unit in an injection foam molding apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

An injection foam molding apparatus 100 according to an embodiment of the present invention is an apparatus for foam molding by injection injection of a foamed material such as EVA, PVC, PE, PP, and the like. As shown in Figs. 1 to 6, A foam molding material injection unit 120, a foam molding die unit 130, a first heating unit 140, and a second heating unit 150. [

The foamed material introducing portion 110 is a plastic foamed material having elasticity such as EVA, PVC, PE, and PP, which is used for introducing the foamed material and the foaming agent into the device. Any one or two The above-mentioned foamed material can be supplied.

The foamed material input unit 110 includes an input hopper 111 coupled to the rear end of the foamed material injection unit 120 and two or more foamed materials installed on the upper side of the input hopper 111, A scale hopper 112 having a load cell for supplying a predetermined amount of an additive such as a foaming agent to the scale hopper 112 and a scale hopper 112 disposed at a lower side of the scale hopper 112, And a foaming material supply guide plate 113 for guiding an additive such as a foaming agent including a foaming material supplied in a fixed amount from the hopper 111 to the injection hopper 111 side.

At this time, the scale hopper 112 can supply plastic foaming materials such as EVA, PVC, PE, and PP, a foaming agent and other additives, but supplies only a predetermined amount.

The foaming agent may be an inorganic foaming agent such as sodium dicarbonate (NaHCO 3 ), ammonium dicarbonate or sodium borohydride (NaBH 4 ) or an organic foaming agent such as ADAC, OBSH, TSH, NTA, DPT, May be used, and it is preferable to use a solid foaming agent.

As the additive, a hardener, a dispersant, a pigment, and the like may be added.

The foaming material supply induction plate 113 collects the foaming material, the foaming agent, and the additives supplied in a predetermined amount through the scale hopper 112, and mixes the foaming material and the additives in a primary mixing state.

The foam materials thus mixed are injected into the cylinder 121 of the foam material injecting unit 120 through the input hopper 111.

As described above, the foamed material injection unit 120 is formed by melt-processing a mixed foam material such as a foamed material and a foaming agent, which are input from the foamed material input unit 110, into a nozzle unit 124 disposed in front of the foamed material injection unit 120, Injected into the foam molding die part 130 through the nozzle part 124 and injected into the foam molding die part 130. [

The foam material injecting unit 120 is connected to the foam material injecting unit 110 and is provided with a cylindrical body. The foam material injecting unit 120 includes a nozzle unit for injecting a foamed material and a mixed foam material such as a foaming agent, And a rotary driving motor 123 which is installed inside the cylinder 121 and stirs a mixed foamed material such as a foaming material and a foaming agent and is connected to a rotary drive motor 123, 124). The extrusion screw (122) is provided to be press-fed to the side of the presser foot (124).

At this time, the cylinder 121 can be configured to melt the mixed foam material such as the foamed material and the foaming agent by heating the first heating part 140 with an electric heater and performing heat heating, The heating unit 140 may be constituted by a steam feeder and heated by steam supply so that the mixed foam material such as the foamed material and the foaming agent is melted.

As shown in FIG. 2, the cylinder 121 is formed of a first jacket portion 121a and a second jacket portion 121b having an outer wall of a double jacket structure for application of a heating method by steam supply .

The first jacket portion 121a is positioned inside the outer wall of the cylinder 121 and the second jacket portion 121b is positioned in close contact with the outer side of the first jacket portion 121a .

The first jacket part 121a may be connected to the first heating part 140 to receive steam and heat the cylinder 121 to melt the mixed foamed material including the foamed material and the foaming agent Can be configured.

In this case, the first heating unit 140 may include a steam supply unit for generating and supplying steam.

A heating method based on steam supply is used through the first heating part 140 but steam is supplied to the foamed material injection part 120 so as to maintain a temperature of 80 to 110 ° C on the side of the cylinder 121, So that it is possible to melt the mixed foamed material or the like which is melted and processed in the cylinder 121 of the foamed material injection part 120 while preventing the decomposition action of the foaming agent to prevent foaming.

The second jacket portion 121b is configured to cool the cylinder 121 of the foam material injecting portion 120 by supplying a cooling fluid of air or gas. The second jacket portion 121b And a first cooling section 142 for supplying a cooling fluid.

The first cooling unit 142 may be a cooling fluid supply device such as a compressor.

The foam molding die part 130 receives the melted mixed foamed material from the foamed material injection part 120 and heat-compresses the foamed material at a predetermined temperature, pressure, and time to foam and form the mixed foamed material to produce a foamed molded product .

The foam molding die part 130 includes a female or a male first cavity forming part having a predetermined shape for forming a cavity for a molding space in which a material inlet hole communicating with the nozzle part of the foamed material injecting part 120 is formed And a second cavity forming portion 132a having a male or female structure corresponding to the first cavity forming portion 131a as a mold corresponding to the first mold, And a second mold 132 formed to face the first cavity forming portion 131a.

The first cavity forming portion 131a and the second cavity forming portion 131b may be formed as a block body separate from the first mold 131 and the second mold 132 to be detachable, When the foamed molded article to be foam molded by the foaming material is different in shape, the first cavity forming portion 131a and the second cavity forming portion 132a can be replaced with each other.

The first cavity forming portion 131a may be detached by fastening and disassembling the bolts 101 to the first mold 131 and the second cavity forming portion 131b may be attached to the second mold 132 The bolts 101 can be detached by fastening and disassembling them.

The foam molding die unit 130 may be configured such that the second heating unit 150 is formed of an electric heater and heated by electrothermal heating to perform foam molding of the mixed foamed material, Can be constituted by a steam feeder and heated by steam supply so that the mixed foamed material can be foam-molded.

Here, the second heating unit 150 may be a steam supply unit that generates and supplies steam.

3, when the steam supply system is applied to the second heating unit 150, the foam molding die unit 130 is divided into a first mold 131 and a second mold 132 The first jacket portion 133 and the second jacket portion 134 are formed inside the first jacket portion 133 and the second jacket portion 134 is formed in close contact with the outer side of the first jacket portion 133, 133 to supply the steam to heat the foam molding die part 130.

And the second cooling part 152 is provided through the second jacket part 134 so that the foam molding die part 130 can be cooled.

The second cooling unit 152 may be a cooling fluid supply unit for supplying a cooling fluid of air or gas and may be connected to the second jacket unit 134.

At this time, the melted foamed material is foamed and molded by heating the foamed molding die part 130 to maintain a temperature of 145 to 220 ° C through the second heating part 150, It is preferable that the mold section 130 is treated so as to maintain a pressure of 120 to 200 kgf / cm 2 on the basis of a pressure gauge during the foaming molding.

In the foam molding die part 130, it is preferable to perform the foam molding process in two steps in order to improve the completion degree and quality of the foamed molded article. In the first step, the temperature is 145 to 180 DEG C and 120 to 150 kgf / At a pressure of 150 to 200 kgf / cm < 2 > for 10 to 20 minutes to complete the foam molding.

In the foamed material injection unit 120 and the foam molding die unit 130, the supply of steam and cooling fluid is configured to circulate through the entire space, and on-off valves are provided on the respective circulation pipe lines.

In the present invention, the blowing agent may be separately injected into the nozzle part 124 of the foamed material injection part 120 without mixing the foamed material and the foaming agent on the foamed material input part 110.

4, the blowing agent injection unit 120 may further include a blowing agent injecting unit 160 for individually injecting the blowing agent into the nozzle unit 124 side, In order to enable selective input in accordance with the present invention.

It is preferable that the foaming agent is injected through the blowing agent introduction part 160 at the rear side of the nozzle part 124.

At this time, the foaming agent through the foaming agent injecting unit 160 may be any known chemical or physical foaming agent, but liquid-phase physical foaming agents such as carbon dioxide, nitrogen, water, and supercritical fluid may be more preferable.

The control unit 170 detects the rotation speed of the rotation driving motor 123 for rotating the extrusion screw 122 or the detection sensor 180 at the boundary between the nozzle 121 and the nozzle unit 124 in the cylinder 121 And transmits the detection signal to the control unit 170. When the foamed material melted by the detection signal or the detection signal from the controller 170 flows into the nozzle unit 124 side, So that the blowing agent can be separately injected into the nozzle portion 124 side and mixed with the foamed material.

The blowing agent introducing unit 160 is provided with an on-off valve for controlling the supply of the blowing agent on the pipe connected to the nozzle unit 124 and may be provided with a check valve for preventing the backflow of the blowing agent supplied thereto I will.

6, the foamed material injection unit 120 has a configuration including a spherical rotary body 190 rotatably installed in a nozzle portion 124 of the cylinder 121 can do.

The spherical rotating body 190 is a spherical body having an empty interior. The spherical rotating body 190 has a plurality of openings formed on the entire circumferential surface forming the spherical body, and the foamed material, which is melted in the cylinder 121, And is rotatably driven naturally by the force of the foaming material and the foaming agent which are fed through the extrusion screw 122. The foaming material and the foaming agent are uniformly mixed by the rotation driving, And exits to the tip of the nozzle unit 124 side through the opening.

The spherical rotating body 190 may further include a foaming agent injecting unit 160 for separately injecting the foaming agent into the nozzle part 124 of the foamed material injecting unit 120 A blowing agent which melts in the cylinder 121 and is transported by the extrusion screw 122 to the front of the nozzle unit 124 and the blowing agent injected into the nozzle unit 124 through the blowing agent input unit 160 The blowing agent injected from the rear is uniformly mixed by rotary driving and discharged to the tip of the nozzle part 124 through a plurality of openings. The mixed foamed material in a state where the foamed material and the foaming agent are uniformly mixed, And can be injected into the molding die part 130.

The operation of the injection foam molding apparatus 100 according to the present invention and the injection foam molding method using the same will now be described.

First, one or two or more kinds of foam materials selected from elastic plastic materials such as EVA, PVC, PE, and PP are introduced through the foam material injecting unit 110, and the solid foam material is charged at a certain ratio .

At this time, depending on the application of the foamed material, a foamed material such as EVA, PVC, PE, or PP may be input through the foamed material input unit 110 and the foamed material may be separately input through the foamed material input unit 160.

The mixed material of the foaming material and the foaming agent is pressurized and fed to the nozzle portion 124 while being stirred and mixed with the molten processed material through the rotation drive of the extrusion screw 122. [

At this time, in order to melt-process the mixed foamed material, the cylinder 121 is heated to maintain a temperature of 80 to 110 ° C.

The mixed foamed material melted into the nozzle unit 124 is injected into the cavity space formed together with the second mold 132 through the first mold 131 of the foam molding die unit 130 through the nozzle unit 124 do.

At this time, in the case where the blowing agent injecting unit 160 is provided to separately inject the blowing agent, when the molten foamed material flows into the nozzle unit 124, the controller 170 senses this and controls the blowing agent injecting unit 160 The foaming agent can be mixed into the molten foamed material by individually injecting the foaming agent.

In addition, when the spherical rotating body 190 is provided, the molten mixed foamed material flowing into the nozzle part 124 passes through the spherical rotating body 190 that is naturally rotated by the mixed foamed material to be fed, The mixing power of the material and the foaming agent can be doubled, and the molten mixed foam material can be injected into the foam molding die part 130 in a uniformly mixed state.

In the foam molding die part 130, the molten mixed foam material injected into the cavity space formed by the first mold 131 and the second mold 132 is heated at a temperature of 145-180 ° C. and 120-150 kgf / Cm 2 for 5 to 10 minutes to allow the wicking and foaming to proceed, and the foaming is performed in two steps at a temperature of 180 to 220 ° C and a pressure of 150 to 200 kgf / cm 2 for 10 to 20 minutes, Thereby forming a foamed molded article having a high expansion ratio and forming a high-quality molded body.

Accordingly, in the present invention, it is possible to prevent a mixture of the foamed material and the foaming agent from being partially foamed before molding, to supply a uniform mixed foamed material to the mold side, to increase the efficiency in foam molding, You can provide the advantages that you have.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. May be made, which will be within the technical scope of the present invention.

100: Injection foam molding machine 110: Foam material input part
120: foaming material injection part 130: foam molding die part
140: first heating part 150: second heating part
160: foaming agent input unit 170: control unit
180: Detection sensor 190: Spherical rotating body

Claims (7)

EVA, PVC, PE, and PP, and a blowing agent; A foaming material injected from the foaming material injecting unit and a foaming agent are mixed and melted, and the foaming material injected into the foam molding die unit through the nozzle unit is injected to the inside of the nozzle unit, An injection section; A foam molding die for blowing and molding a mixed foamed material containing a foaming agent by heating the foamed foamed material from the foamed material injection part at a predetermined temperature, pressure and time; A first heating part for melting the foamed material including the foaming agent injected into the inside by heating the foamed material injection part; And a second heating part for performing a foaming process on the molten mixed foamed material injected into the inside by heating the foamed molding die part,
The foamed material injection unit is a cylindrical body connected to the foamed material input unit and has a nozzle unit for mixing and melting the foamed material input from the foamed material input unit with the foaming agent and injecting the melted mixed foamed material cylinder; An extrusion screw installed inside the cylinder and coupled to the rotation driving motor to press and feed the mixed foamed material toward the nozzle portion; A spherical rotating body rotatably installed in a nozzle portion of the cylinder; / RTI >
Wherein the cylinder is constituted by a first jacket portion and a second jacket portion having a double jacket structure with respect to an outer wall, the first jacket portion is located in an inner direction of an outer wall of the cylinder, and the second jacket portion is located on the outer side of the first jacket portion Direction;
Wherein the first heating unit is a steam supply unit that heats the cylinder by supplying steam to the first jacket unit and the cooling fluid is supplied to the second jacket unit to cool the cylinder;
The spherical rotary body is a sphere-shaped body having an empty interior. A plurality of openings are formed over the entire outer peripheral surface forming the spherical body, so that the foamed material and the foaming agent, which have been melted in the cylinder, The foaming material and the foaming agent are uniformly mixed by the rotational driving by the force of the foaming material and the foaming agent which are pressure-fed through the extrusion screw so as to be discharged to the tip of the nozzle portion side;
Wherein the foam molding die part maintains a pressure of 120 to 200 kgf / cm 2 on the basis of a pressure gauge during foam molding;
In order to improve the completeness and quality of the foamed molded article, the foamed metal mold part is first subjected to the foaming molding process in two steps, firstly treated at a temperature of 145 to 180 ° C and a pressure of 120 to 150 kgf / cm 2 for 5 to 10 minutes, Wherein the secondary treatment is performed at a temperature of 180 to 220 캜 and a pressure of 150 to 200 kgf / cm 2 for 10 to 20 minutes. delete The method according to claim 1,
A foaming agent injecting part for injecting the foaming agent into the nozzle part side of the foamed material injection part without mixing the foaming agent into the foamed material injection part on the foamed material injection part; Further comprising:
The control unit detects the rotational speed of the rotary drive motor for rotating the extrusion screw or mounts the sensor at a boundary point with the in-cylinder nozzle unit and transmits a detection signal to the control unit;
Wherein the controller controls the blowing agent introduction part when the foam material flows into the nozzle part by the detection signal or the detection signal so that the blowing agent is mixed into the individual injection and foam materials to the nozzle part side. The method according to claim 1,
Wherein the first heating unit comprises:
The foam material is heated so as to maintain a temperature of 80 to 110 캜 with respect to the foam material injecting unit so that the foaming material to be melted in the foam material injecting unit can be melted and the foaming does not proceed In addition,
The second heating unit
Wherein the molten foamed material is heated and maintained at a temperature of 145 to 220 캜 with respect to the foamed molding die to foam and form the mixed foamed material. The method according to claim 1,
Wherein the foam molding die portion comprises:
A first mold having a female or a male first cavity forming part of a predetermined shape for forming a cavity for a molding space in which a material inflow hole communicating with the nozzle part of the foamed material injection part is formed;
A second metal mold corresponding to the first metal mold, wherein a second cavity forming portion of a male or female structure corresponding to the first cavity forming portion is formed to face the first cavity forming portion; ≪ / RTI >
The first cavity forming part and the second cavity forming part may be formed as a block-shaped body separated from the first mold and the second mold, respectively, so that when the shape of the foamed molded article is foamed by the mixed foamed material, Wherein the first cavity forming portion and the second cavity forming portion are configured to be used by being replaced only by the first cavity forming portion and the second cavity forming portion. The method according to claim 1,
The second heating unit
An electric heater or steam supply;
In the case of the steam supply device, the foam molding die part has a first jacket part and a second jacket part formed inside each of the first mold and the second mold, and the second jacket part is formed in close contact with the outer side of the first jacket part, Supplying steam to the first jacket portion to heat the foam molding die portion;
Wherein the second jacket portion is configured to be connected to a cooling fluid supply device that supplies cooling fluid of air or gas to cool the foam molding die portion. The method according to claim 1,
The foamed material input unit includes:
An injection hopper coupled to a rear end of the foam material injection unit;
A scale hopper provided with two or more on the upper side of the feed hopper and having a load cell for supplying a foaming agent and a foaming agent including a foaming agent in a fixed amount;
A foaming material supply guide plate for guiding a foaming agent including a foaming material supplied from the scale hopper to the loading hopper side, the foaming material supply guide plate being positioned below the scale hopper in which the two or more are installed; And an injection molding machine for molding the injection foam.
KR1020170119742A 2017-09-18 2017-09-18 Injection foaming apparatus KR101863001B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3715085A1 (en) * 2019-03-29 2020-09-30 Chung Yuan Christian University Injection molding apparatus and injection molding method
KR20220148055A (en) 2021-04-28 2022-11-04 삼도폴리텍 주식회사 Packing box with tape separation of box
CN116922711A (en) * 2023-09-18 2023-10-24 昆山晟豪鑫健康科技有限公司 Plastic part injection molding and foaming integrated molding die and application method

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KR100550528B1 (en) 2003-02-10 2006-02-10 엘지전자 주식회사 Foamed plastic molding, molding machine and molding method for the same
KR101716300B1 (en) 2015-11-19 2017-03-14 (주)엠피코 Cylinder heating apparatus of injection molding machine

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Publication number Priority date Publication date Assignee Title
KR100550528B1 (en) 2003-02-10 2006-02-10 엘지전자 주식회사 Foamed plastic molding, molding machine and molding method for the same
KR101716300B1 (en) 2015-11-19 2017-03-14 (주)엠피코 Cylinder heating apparatus of injection molding machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3715085A1 (en) * 2019-03-29 2020-09-30 Chung Yuan Christian University Injection molding apparatus and injection molding method
CN111745887A (en) * 2019-03-29 2020-10-09 中原大学 Injection molding apparatus and injection molding method
KR20220148055A (en) 2021-04-28 2022-11-04 삼도폴리텍 주식회사 Packing box with tape separation of box
CN116922711A (en) * 2023-09-18 2023-10-24 昆山晟豪鑫健康科技有限公司 Plastic part injection molding and foaming integrated molding die and application method
CN116922711B (en) * 2023-09-18 2023-12-05 昆山晟豪鑫健康科技有限公司 Plastic part injection molding and foaming integrated molding die and application method

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