KR20070029237A - Apparatus and method for manufacturing plastic spongy body having increased specific surface area and porosity - Google Patents

Abstract

An apparatus and a method for manufacturing a synthetic resin sponge body having increased specific surface area and porosity are provided to change a diameter of the filament and improve the specific surface area of the sponge body by changing the discharge pressure of the filament. An apparatus for manufacturing a synthetic resin sponge body is composed of a melting extruder(100) melting and extruding the synthetic resin; a nozzle frame(120) placed at the outlet of the melting extruder and formed with plural injection nozzles; and a molding machine molded as the sponge body by laminating, melting, and cooling the filament. The molding machine contains a feed belt(130) placed at the lower side of the nozzle frame and formed with plural penetration holes, and a driving part rotation-driving the feed belt. A blower(140) is placed to blow the air through the plural penetration holes of the feed belt.

Description

APPARATUS AND METHOD FOR MANUFACTURING PLASTIC SPONGY BODY HAVING INCREASED SPECIFIC SURFACE AREA AND POROSITY}

1 is a photograph of an example of a synthetic resin sponge;

Figure 2 is a perspective view of one embodiment of a synthetic resin sponge body manufacturing apparatus according to the present invention,

3 is a front view of the embodiment of FIG. 2;

4 is a right side view of the embodiment of FIG. 2;

5 is a perspective view of another embodiment of a synthetic resin sponge body manufacturing apparatus according to the present invention,

Figure 6 is a flow chart of an embodiment of a synthetic resin sponge body manufacturing method according to the present invention,

Figure 7 is a flow chart of another embodiment of a synthetic resin sponge body manufacturing method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

50: filament 60: spongy body

100: melt extruder 120: nozzle frame

130: conveying belt 140: blower

150: injector 160: thermal cover

170: ventilator 180: heater

The present invention relates to a manufacturing apparatus and a manufacturing method of a synthetic resin sponge, and more particularly, to a manufacturing apparatus and a manufacturing method which can improve the specific surface area and porosity in manufacturing a synthetic resin sponge.

A spongy body refers to a porous object with elasticity. It is used as a bedding, packaging material, or other shock absorbing material by using a cushion, and it is used for bathing, medical treatment, cosmetics, washing by using porosity. It is also used as. In order to increase the shock absorption, moisture absorption and moisture permeability, the sponges are required to have a high specific surface area and porosity.

In order to manufacture a sponge as a synthetic resin, there is a method of foaming the synthetic resin stock solution, but in order to manufacture a material in which specific surface area or porosity is more important, the method of manufacturing the sponge by extrusion may be more advantageous. Therefore, a method of manufacturing sponges by extrusion is developed in various forms. 1 is a photograph of an example of a spongy body 60 produced by such extrusion.

However, since the spongy body manufacturing apparatus uses a simple process of melting and extruding a synthetic resin in a continuous yarn shape and spontaneously dropping it on a plane, there is a limit in improving the specific surface area and porosity. In addition, the synthetic resin extruded into a yarn is cured to form a final spongy body. If the curing time is not sufficiently secured, adjacent filaments are not smoothly fused to form a spongy body, or the strength of the spongy body is significantly lowered and hardened. If the time is too long, due to sedimentation due to the weight of the filamentous body, there is a problem that the porosity of the final sponge is significantly reduced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a manufacturing apparatus and a manufacturing method that can improve the specific surface area and porosity in the manufacture of sponges by extruding synthetic resin.

Another object of the present invention is to provide a manufacturing apparatus and a manufacturing method that can efficiently control the curing time of the extruded synthetic resin.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

In order to achieve the above object, the synthetic resin sponge manufacturing apparatus according to the present invention includes a melt extruder for melting and extruding a synthetic resin, and a plurality of injection nozzles disposed at an outlet of the melt extruder and extruding the molten synthetic resin into a filamentous body. In the extrusion resin composite body manufacturing apparatus comprising a nozzle frame and a molding machine for laminating, fusion and cooling the filament to form a spongy body shape, the molding machine is disposed below the nozzle frame, the plurality of through-holes Formed conveying belt, characterized in that it comprises a drive for rotating the conveying belt.

In the apparatus for preparing synthetic spongy body according to the present invention, it is preferable to further include a blower for injecting air through a plurality of through holes of the transfer belt.

In addition, the synthetic resin sponge body manufacturing apparatus according to the present invention, a melt extruder for melting and extruding the synthetic resin, a nozzle frame formed at the outlet of the melt extruder, a plurality of injection nozzles for extruding the molten synthetic resin into a filamentous body, and the filamentous body An apparatus for producing a synthetic resin sponge by extrusion comprising a molding machine for laminating, fusion, and cooling a mold into a sponge body shape, the apparatus comprising: a heat insulating cover surrounding the nozzle frame and the molding machine, and a ventilator for venting air inside the heat insulating cover to the outside; It may be characterized in that it further comprises.

And the synthetic resin sponge body manufacturing apparatus according to the present invention, a melt extruder for melting and extruding the synthetic resin, a nozzle frame formed at the outlet of the melt extruder, a plurality of injection nozzles for extruding the molten synthetic resin into the filamentous body, and the filamentous body In the apparatus for producing a synthetic resin sponge body by extrusion comprising a molding machine for laminating, fusion, and cooling to form a sponge body shape, the plurality of injection nozzles are arranged to form a plurality of nozzle groups, the plurality of nozzle groups are spaced apart from each other It may be characterized by being arranged. At this time, it is preferable to further include a separating plate disposed above the transfer belt at a position corresponding to the interval between the plurality of nozzle groups.

In addition, the synthetic resin sponge body manufacturing apparatus according to the present invention, a melt extruder for melting and extruding the synthetic resin, a nozzle frame formed at the outlet of the melt extruder, a plurality of injection nozzles for extruding the molten synthetic resin into the filamentous body, and An apparatus for producing synthetic resin spongy bodies by extrusion, comprising a molding machine for laminating, fusion and cooling filaments to form a spongy body shape, the apparatus comprising: an injector disposed between the nozzle frame and the molding machine and injecting compressed air toward the filamentous body; It may be characterized in that.

Meanwhile, the synthetic resin sponge body manufacturing method according to the present invention comprises the steps of melting a synthetic resin, extruding the molten synthetic resin into a plurality of filamentous bodies, rocking the extruded plurality of filamentous bodies, and the extruded plurality of filamentous bodies Laminating a surface on a linearly moving surface to form a sponge, and cooling the sponge.

In the synthetic resin sponge body manufacturing method according to the present invention, the rocking of the plurality of filamentous body, it is preferable to spray the compressed air toward the plurality of filamentous body. Alternatively, the rocking of the plurality of filamentous bodies may be characterized by changing the extrusion pressure.

In addition, in the method of manufacturing a synthetic resin spongy body according to the present invention, the step of forming the spongy body, it is preferable to include a step of spraying an adhesive to the laminated filament.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the lifting module of the stud welding gun according to the present invention.

Figure 2 is a perspective view of one embodiment of a synthetic resin sponge body manufacturing apparatus according to the present invention, Figure 3 is a front view of the embodiment of Figure 2, Figure 4 is a right side view of the embodiment of FIG.

This embodiment includes a melt extruder 110, a nozzle frame 120, and a molding machine.

The melt extruder 110 is for melting and extruding a synthetic resin. The melt extruder 110 receives the raw material of synthetic resin from the inlet 111, and transfers the raw material of synthetic resin by a transfer means such as a screw feeder, and simultaneously heats and melts the melted synthetic resin to the outlet 112. Discharge. The melt extruder 110 may be implemented by a conventional screw extruder.

The nozzle frame 120 is for discharging the molten synthetic resin into a thread-like body, and is installed to communicate with the outlet 112 side of the melt extruder 110. A plurality of injection nozzles are formed in the nozzle frame 120, and when the molten synthetic resin provided from the melt extruder 110 is extruded to the outside while passing through these injection nozzles, the synthetic resin is extruded into a continuous yarn shape, which is a synthetic resin. It becomes a filament 50. In consideration of free fall of the extruded filament 50, the spray nozzle is preferably formed downward from the lower portion of the nozzle frame 120. In addition, it is preferable that the plurality of injection nozzles are arranged to form a plurality of nozzle groups as shown in FIG. 4. For example, when a total of 300 injection nozzles are formed, 100 injection nozzles are disposed adjacent to each other to form three nozzle groups 121, 122, and 123, and the nozzle groups 121, 122, and 123 are spaced apart from each other. Is placed.

The molding machine is for molding the filamentous body 50 into a sponge body shape, and is disposed below the nozzle frame 120. The molding machine repeatedly bends and stacks the fenders 50 falling from the nozzle frame 120. In this process, the filaments not yet hardened are fused to each other to form a spongy body 60 (see FIG. 1). The molding machine preferably comprises a conveying belt 130 and a driving unit for rotating the conveying belt 130 so as to be suitable for continuous manufacture of the sponge.

Since the conveying belt 130 should be able to repeatedly bend the falling filament 50, it is preferable that projections are formed on the surface instead of having a flat surface. However, forming a plurality of through holes 131 rather than forming a plurality of protrusions on the surface of the conveying belt 130 is not only convenient for manufacturing, but also it is possible to reduce the material required for manufacturing the conveying belt 130 and to reduce the weight. Do. A plurality of through holes 131 are formed in the conveyance belt 130, and the filamentary bodies 50 continuously discharged fall into the through holes 131 or by being spread around the inlet of the through holes 131. 50) are naturally bent and stacked. The driving unit is for rotating the conveying belt 130, and is implemented by a combination of a conventional electric motor and a power transmission means such as a belt and a pulley.

When the injection nozzles of the nozzle frame 120 form the nozzle groups 121, 122, and 123, it is preferable that the separator is further provided with a separating plate 132. The separating plate 132 is a plate-like member, and is vertically disposed to have a gap corresponding to the gap between the nozzle groups 121, 122, and 123. That is, when three nozzle groups 121, 122, and 123 are formed, four separation plates 132 are provided, and the four separation plates 132 each have nozzle groups 121 and 122 above the transfer belt 130. , 123 and fixedly disposed at ends of the nozzle groups 121, 122, and 123, respectively. When the separating plate 132 is provided, the filament 50 discharged from each nozzle group 121, 122, 123 is prevented from mixing with the filament discharged from another adjacent nozzle group or leaving the conveying belt 130. can do.

As described above, when the plurality of injection nozzles form the nozzle groups 121, 122, and 123, and the separating plate 132 is provided above the conveying belt 130, the sponge 3 having a narrow width according to the present embodiment is provided. Dogs can be produced simultaneously. Therefore, compared to manufacturing three narrow sponges by making a wide sponge first and then dividing it into three, it is possible not only to omit the cutting process but also to prevent debris caused by cutting and to have a sharp cut surface. Lowering can also be prevented.

As described above, the filament 50 stacked on the conveying belt 130 begins to harden soon, and when the time required to harden becomes long, the filament 50 is settled by the weight of the filament 50 while finally maintaining the plasticity. The porosity of the spongy body 60 formed by hardening is reduced. Therefore, in order to reduce the time required for hardening, a separate blower 140 is provided, and the air supplied from the blower 140 is passed through the through-hole 131 of the transfer belt 130 through the blower duct 141. By supplying, it is preferable to cool the filament 50 quickly. Supplying air through the through-hole 131 of the transfer belt 130 as described above is to inflate the filament 50 by air pressure until the filament 50 stacked on the transfer belt 130 is cured. This also has the effect of improving the porosity of the spongy body 60.

On the other hand, the filament 50 discharged from the nozzle frame 120 is naturally bent and laminated while reaching the conveying belt 130, but it is necessary to artificially apply an external force to the filament 50 to further facilitate this process. have. To this end, it is preferable to further include an injector 150 between the nozzle frame 120 and the conveyance belt 130. The injector 150 injects compressed air to the filament 50 discharged from the nozzle frame 120, so that the filament 50 is pushed by the compressed air, causing oscillation, and reaching the conveyance belt 130. It causes a lot of bending and lamination. As a result, the spongy body to be the final product further improves the porosity.

Furthermore, if the pressure for discharging the molten synthetic resin in the melt extruder 110 is changed, the discharge speed of the filamentous body 50 to be discharged is changed, so that when the filamentary body 50 reaches the conveying belt 130, the bending effect and the lamination effect Of course, the diameter of the filamentous body 50 is also changed. Therefore, changing the discharge pressure in the melt extruder 110 can improve the specific surface area as well as the porosity of the sponge body 60.

Figure 5 is a perspective view showing another embodiment of the synthetic resin sponge body manufacturing apparatus according to the present invention.

The difference from the previous embodiment is that it further includes a heat insulating cover 160 surrounding the nozzle frame 120 and the molding machine, a fan 170 and a heater 180.

The thermal cover 160 surrounds the nozzle frame 120 and the molding machine and serves to block the external environment. The filament 50 discharged from the nozzle frame 120 is hardened in accordance with the temperature conditions change, if the cooling rate is too fast, it is hardly bent and laminated without being sufficiently laminated to prevent the formation of a suitable spongy body, cooling rate If too slow, the filamentary body 50 is settled under the influence of gravity, thereby forming a sponge body having insufficient porosity or specific surface area. Therefore, in order to control the rate at which the filament 50 is cured, it is necessary to isolate the space where hardening of the filament 50 occurs from the external environment, and the thermal cover 160 is necessary for this.

Since the insulating cover 160 is provided, it is possible to slow down the rate at which the filament 50 is cured, especially in a low temperature environment in winter. Furthermore, in order to increase the temperature inside the thermal cover 160, it is preferable to additionally install the heater 180 in the thermal cover 160, on the contrary, in order to lower the temperature inside the thermal cover 160 inside the thermal cover 160 It is preferable to further include a blower 170 for exchanging the air of the outside air. Although the heater 180 is illustrated as being embedded in the wall of the insulating cover 160, the heater 180 may be disposed separately and may be configured to supply only the warm air into the insulating cover 160 by a separate blower. On the other hand, even when the thermal cover 160 is provided, it is preferable that the thermal cover 160 is provided with an observation window 161 made of a light-transmissive material so that it is possible to visually check the manufacturing status of the tube spherical body to the outside.

Hereinafter will be described a preferred embodiment of the synthetic resin sponge body manufacturing method according to the present invention in detail.

Figure 6 is a flow chart showing an embodiment of a synthetic resin sponge body manufacturing method according to the present invention.

First, raw materials such as synthetic resin chips are supplied and melted (S110).

The molten synthetic resin is discharged under pressure, but is discharged through the injection nozzle, so that the molten synthetic resin is extruded as a continuous yarn shape, that is, a filamentous body (S120).

It causes shaking to the extruded filament (S130). By swinging the filamentous body, the bending and stacking effects of the filamentous body can be further increased in the step S140 of forming a sponge to be described later. The filamentous body is extruded through a nozzle frame having a plurality of injection nozzles, for example, and oscillation occurs when the vibration is applied to the nozzle frame. In addition, the specific method of rocking the filament will be described in detail in another embodiment described below, and any means may be used as long as it can rock the filament falling in the form of a long thread.

The extruded filaments are bent and laminated to form a sponge (S140). At this time, if the filament falls on the surface moving in the linear direction, the filament that has not yet been cured is naturally bent and stacked, and the continuous production of the spongiform is possible.

The formed spongy bodies are cooled to cure the synthetic resin (S150). Finally, the manufacture of the spongy body is completed.

Figure 7 is a flow chart showing another embodiment of the synthetic resin sponge body manufacturing method according to the present invention.

Unlike the previous embodiment, this embodiment includes a step (S131) of spraying compressed air toward the filamentous body, a step of changing the extrusion pressure (S132), and a step of spraying an adhesive onto the filamentous body (S141).

Spraying compressed air toward the filament (S131) should be performed prior to the step (S141) of spraying the adhesive onto the filament to form a sponge, and causing the filament to fluctuate on the filamentous stem continuously discharged by the compressed air. Increase the effect of bending and stacking. As a result, the porosity of the sponge is improved. That is, spraying compressed air (S131) corresponds to a specific example of the step (S130) of rocking the filamentous body of the previous embodiment.

The step (S132) of changing the extrusion pressure is shown as a separate step performed before the step (S141) of spraying the adhesive to the filament and forming the sponge in FIG. 7, but extruding the molten synthetic resin into the filament ( May be performed as part of S120). That is, in the step (S132) of changing the extrusion pressure, by varying the discharge speed and diameter of the filament to be extruded, as a result, the porosity of the sponge is improved as well as the specific surface area. Changing the extrusion pressure (S132) also corresponds to another specific example of the step (S130) of shaking the filament of the previous embodiment.

Although the step (S131) of spraying compressed air toward the filament described above and the step (S132) of changing the extrusion pressure are illustrated as being in an alternative relationship in FIG. 7, since they are not mutually incompatible, both It is also possible to perform steps S131 and S132 sequentially.

Spraying the adhesive to the filament to form a spongy body (S141) is performed as part of the step of forming a spongy body by bending and stacking the filament of the previous embodiment (S140), the adhesive between the filaments in the process of bending, laminating the filament By spraying, the bonding force between filaments is improved.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

As described above, the apparatus and method for manufacturing a synthetic spongy body according to the present invention can increase the effect of bending and stacking by causing fluctuations in the synthetic filamentous body, and as a result, can produce a spongy body with improved porosity. In addition, by changing the discharge pressure of the filamentous body, the diameter of the filamentous body can be changed to improve the specific surface area of the sponge.

Furthermore, when the insulating cover is provided, the curing speed of the filament to be extruded can be easily controlled, so that the quality of the spongy body manufactured regardless of the surrounding environment can be kept constant.

Claims (7)

Melt extruder for melting and extruding synthetic resin, A nozzle frame disposed at an outlet of the melt extruder and having a plurality of injection nozzles for extruding molten synthetic resin into a filamentous body; In the synthetic resin sponge body manufacturing apparatus by extrusion comprising a molding machine for laminating, fusion and cooling the filament to form a spongy body shape, The molding machine, A transfer belt disposed below the nozzle frame and having a plurality of through holes formed therein; Synthetic resin sponge body manufacturing apparatus comprising a drive unit for rotating the conveying belt. The method of claim 1, Synthetic resin sponge body manufacturing apparatus further comprises a blower for injecting air through a plurality of through holes of the conveyance belt. Melt extruder for melting and extruding synthetic resin, A nozzle frame disposed at an outlet of the melt extruder and having a plurality of injection nozzles for extruding molten synthetic resin into a filamentous body; In the synthetic resin sponge body manufacturing apparatus by extrusion comprising a molding machine for laminating, fusion and cooling the filament to form a spongy body shape, Insulating cover surrounding the nozzle frame and the molding machine, Synthetic resin sponge body manufacturing apparatus further comprises a ventilator for ventilating the air inside the thermal cover to the outside. Melt extruder for melting and extruding synthetic resin, A nozzle frame disposed at an outlet of the melt extruder and having a plurality of injection nozzles for extruding molten synthetic resin into a filamentous body; In the synthetic resin sponge body manufacturing apparatus by extrusion comprising a molding machine for laminating, fusion and cooling the filament to form a spongy body shape, The plurality of injection nozzles are arranged to form a plurality of nozzle groups, Synthetic resin sponge body manufacturing apparatus characterized in that the plurality of nozzle groups are disposed spaced apart from each other. The method of claim 4, wherein Synthetic resin sponge body manufacturing apparatus further comprising a separating plate disposed above the transfer belt at a position corresponding to the interval between the plurality of nozzle groups. Melting the synthetic resin, Extruding the molten synthetic resin into a plurality of filaments; Rocking the extruded plurality of filaments; Stacking the extruded plurality of filamentous bodies on a linearly moving surface to form a sponge; Cooling the sponge; Rocking the plurality of filaments, And spraying compressed air toward the plurality of filamentous bodies, and at least one selected from the steps of changing the extrusion pressure. The method of claim 6, wherein forming the spongy body, Synthetic resin sponge body manufacturing method comprising the step of spraying the adhesive to the laminated filament.

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