KR100723667B1 - Extrusion molding machine - Google Patents

Abstract

The extruder 11 is a cylinder (50), screw (70), silo (30) for transporting the silo (30) supplied with the foam material (1), the foam material (1) supplied to the silo (30) And a tank 40 which is connected to the supply path between the screws 70 to receive the water 41, a die 80 connected to the tip of the cylinder 50, and the foam material 1, and melts the water ( Heater 60 for heating in a six-stage direction from the silo 30 side end of the cylinder 50 toward the front end of the die 80 from the initial temperature lower than the vaporization temperature of 41 to the final temperature at which the water 41 is completely vaporized. ).

Extrusion Machines, Silos and Cutters

Description

Extrusion Machines {EXTRUSION MOLDING MACHINE}

The present invention relates to an extrusion machine.

Conventionally, packaging cushioning materials accommodated with such devices are used in order to protect easily damaged items such as precision devices such as electronic devices, electronic parts, or fruits from external shocks. Such packaging cushioning material is formed by foaming a foaming material made of a resin such as polypropylene and molding a foam in which small voids are formed. Such foams are generally produced by an extruder.

That is, in the extruder, the foaming material is supplied into the cylinder and the foaming fluid such as water or oil is supplied from the tank to the cylinder, and the foamed material and the foaming fluid are mixed together by the heating of the cylinder while mixing the foaming material and the foaming fluid through the screws in the cylinder. . At this time, the foaming fluid mixed with the foaming material is condensed under high pressure in the cylinder, and part of the foaming fluid is in a vaporized state. And when the foamed material including the condensed foaming fluid is extruded from a hole formed in the die, the pressurized state is opened instantly and explosive vaporization occurs to form a foam.

However, when the foaming material including the foaming fluid is heated and vaporized in a moment, the foaming fluid flows back from the cylinder to the tank by the expansion action due to rapid vaporization. In this case, since uniform voids are not formed in the foaming material due to non-uniform supply of the foaming fluid, there is a problem in that the production efficiency is not stable because a stable product such as shape cannot be manufactured stably.

The extruder of the present invention includes a silo receiving a foam material constituting the foam and a cylinder and screw for mixing and transporting the foam material supplied to the silo, and extruding the foam through a die connected to the end of the cylinder. A molding machine comprising: a tank connected to a supply path between the silo and the screw and a tank containing a foaming fluid for foaming the foamed material and an initial temperature lower than the vaporization temperature of the foaming fluid while melting the foamed material; And a heater for heating stepwise from the silo side base end of the cylinder to the end side until the final temperature at which the foaming fluid is completely vaporized.

Examples of the foaming material include general plastics such as polyethylene (PE), polypropylene (PP), polyamide (6 nylon, 6,6 nylon, etc .; PA), polyethylene terephthalate (PET), and biodegradable plastics such as polylactic acid. Can be used. In addition, the foaming material may be used by adding a certain additive to such plastics or by adding a thickener such as paper or starch. In addition to the addition of a thickening agent such as paper or starch, it may also be configured by adding crushed wood powder, activated carbon, rice straw or other plant materials or wood materials. In such a case, the addition of such materials can also suppress the adsorption and absorption of materials that are not needed, and can also suppress the occurrence of bacteria or mold.

As step heating, heating is carried out by dividing the cylinder into several stages between the initial temperature and the final temperature. For example, a configuration in which a cylinder is divided into several parts to change their set temperatures to form a gradient in stages and rises can be used. . If the initial temperature and the final temperature are specified, the set temperature between them is not particularly limited. Therefore, the temperature may be set to increase gradually, or may be set to lower the constant temperature in the middle.

The extruder of the present invention is produced in the foam as follows.

(1) First, the foaming material supplied to a silo is supplied in a cylinder. At this time, the foaming fluid in the tank is supplied from the nozzle of the tank connected to the supply path between the silo and the screw to the supply path between the silo and the screw.

(2) Next, the material containing the foaming fluid supplied in the cylinder is mixed uniformly by the rotation of the screw while heating through the heater. At this time, the foamed material in the cylinder is heated step by step through the heater to be molten at the final temperature. In addition, the foaming fluid in the cylinder is first heated by the heater to an initial temperature lower than the vaporization temperature, and then stepwise to the final temperature. The mixed material (mixed material) in which the foaming fluid condensed in the foamed material in the molten state is uniformly dispersed is transported to the die side through the rotation of the screw.

(3) The mixed material conveyed to the die side is again formed into a predetermined shape through the die by rotating the screw, and is extruded outward from the hole formed in the die. At this time, in the mixed material extruded to the outside, the condensed foaming fluid is released from the pressurized state and evaporated explosively, and since the foamed material is rapidly cooled and cured, a foam having voids is formed in the foamed material.

(4) After that, it is appropriately cut and commercialized.

Thus, since the foaming fluid supplied into the cylinder is heated step by step with the transport of the mixed material, the foaming fluid is foamed without being affected by the sudden expansion change of the foaming fluid, as compared with the case where the foaming fluid is heated up to the vaporization temperature or more at once. The phenomenon of backflow of the fluid into the tank can also be prevented.

In addition, due to the structure of supplying the foaming fluid to the supply path between the screw and the silo, since the foaming fluid is not directly supplied to the screw in the cylinder, it is not affected by the change of the foaming fluid in the cylinder, This can better prevent the backflow of the fluid to the tank. In this way, backflow to the tank can be prevented, so that a foam having stable quality can be produced with high efficiency. As described above, the object of the present invention can be achieved.

In the extrusion molding machine of the present invention, the foaming fluid used water, and the heater is set to the initial temperature of 60 ℃ to less than 100 ℃, the final temperature of 160 ℃ to less than 240 ℃, the foam material and It is preferable to heat the foaming fluid in six stages.

In such a configuration, the water supplied in the cylinder is first heated to a temperature below the boiling point (generally, the boiling point of water is 100 ° C.) by a heater, and then divided into six stages, and finally, an environment of 160 ° C. or more and less than 240 ° C. To reach. At this time, the heated water is pressurized by the foamed material transported inside and after the space enclosed by the cylinder and the die, and is pressurized when it is discharged from the die to the outside to vaporize in a moment to form a foam. Even in the case of using easily obtainable water as a raw material, it is possible to prevent the backflow of water by heating stepwise, thereby making it possible to efficiently and inexpensively prepare a foam having stable quality.

In the extrusion molding machine of the present invention, the foamed material is preferably formed in a powder state and has a vibration structure for intermittently vibrating the side portions of the silo.

The powdered foam material may be a powder, a particulate or pellet material, or a pulverized product.

As the vibrating mechanism, for example, a mechanism for rotating the cam via a motor to vibrate the side of the silo and vibrating through an electromagnetic vibrating force using a leaf spring, an electromagnet or the like can be used.

In such a configuration, for example, even when the foamed material formed in the silo is fixed in the silo, the vibrating mechanism vibrates the side portions of the silo, thereby eliminating the sticking between the foamed materials, and thus the powdered foamed material. Can be smoothly supplied into the cylinder.

In the extruder of the present invention, the vibration mechanism includes a motor and a cam connected to the motor, and the cam vibrates the silo by tapping a side portion of the silo by driving of the motor.

In such a case, the vibrating mechanism can be configured relatively simply by attaching the cam to the motor and arranging the tip of the cam rotating through the motor to strike the side part of the silo.

In the die extruder of the present invention, the die is provided with a plurality of holes for extrusion, and the plurality of holes are preferably arranged so that the triangular shapes defined by three adjacent holes are equal to each other.

Here, in the manufactured foam, unfoamed portions may occur, or the quality of shapes, such as swelling due to excessive foaming, defects or clogging of the foamed material in the die, unmelting, or the like, may be unstable. However, since the distances between the plurality of holes formed in the die are approximately equally positioned in the simple configuration in which the holes are formed in the above-described position, the quality of the foamed foam discharged from the die can be easily stabilized.

In the extruder of the present invention, the plurality of holes are each formed in a circular shape, and the diameter of the circular shape is preferably 1.8 mm to 2.2 mm.

In such a configuration, if the diameter of the hole is smaller than 1.8 mm, there is a possibility that a portion where foaming is not sufficient occurs. In addition, if the diameter of the hole is larger than 2.2mm, a portion where foaming is not sufficient may occur. For this reason, by foaming the pore diameter of the die within the above-mentioned range, it is possible to more reliably produce a foam sufficiently foamed and of good quality.

In the extrusion machine of the present invention, it is preferable to include a temperature control device for controlling the die to a temperature between 160 ° C and 220 ° C.

In such a configuration, when the temperature of the die is lower than 160 ℃ through heating by the temperature control device, there is a risk of insufficient foaming, and if the die temperature is higher than 220 ℃ due to overheating There is a risk of deterioration of the foam material due to heat deterioration. Therefore, by controlling the temperature of the die within the above-described range, it is possible to more reliably produce a foam that is sufficiently foamed and has excellent quality.

In the extrusion molding machine of the present invention, a cutter may be provided on the cylinder side instead of the die and rotated at a constant speed to cut the foam extruded from the cylinder.

Here, for example, it is provided with a cutter body mounted on the cylinder as a cutter to discharge the mixed material extruded from the cylinder, and a cutter body for cutting the foamed foam of the mixed material discharged from the cage. can do.

By such a configuration, a foam of any length can be easily produced by adjusting the rotational speed of the blade portion of the cutter of the cutter body and the extrusion speed of the mixed material (foam), for example, the rotational speed of the screw. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the extrusion molding machine which concerns on 1st Embodiment of this invention.

Fig. 2 is an exploded perspective view showing a part of a cylinder and a die in the first embodiment.

3 is a front view of the die.

4 is a view showing a plate-like foam in the first embodiment.

It is a figure which shows typically the extrusion molding machine which concerns on 2nd Embodiment of this invention.

Fig. 6 is a perspective view of the cutter in the second embodiment.

FIG. 7 is a view showing a cylindrical foam in the second embodiment. FIG.

[First Embodiment]

EMBODIMENT OF THE INVENTION The 1st Embodiment of this invention is described with reference to drawings.

1 is a view schematically showing an extruder 11 according to the present invention.

As shown in Fig. 1, the extruder 11 foams a foam containing voids therein when the foamed material 1 containing a thermoplastic resin such as polypropylene is heated and melted to be extruded into a predetermined shape. As a machine for forming a mold, the raw material tank 20, the silo 30, the fluid tank 40, the cylinder 50, the heater 60, the screw 70 installed in the cylinder 50 to which the foaming material 1 is supplied ), The die 80, the belt conveyor 90, and the temperature controller 100 for controlling the temperature of the die 80 within a range of 160 ° C. to 220 ° C.

Here, the foaming material 1 is provided with the base agent 2 which is a main component, and the additive 3 which adjusts so that uniform space | gap may be formed with respect to the base agent 2.

The base agent 2 contains 40 weight% of polypropylene (2A) as a powder which is a resin component, and 60 weight% of corn starch (2B) which is powder which is a non-resin component. The melting point of polypropylene (2A) is 160 ° C. As polypropylene 2A, other forms, such as pellets other than powder, can also be used.

The additive 3 is talc 3A added in a predetermined weight ratio with respect to the base agent 2.

Here, the resin component cannot be treated with general waste.

The non-resin component is a component excluding various recycling target components such as metal, paper, glass, and plastic, and may be treated as general waste without being treated as a recycling target component in the container regeneration method.

The additive is a foam control material added to control the foaming state when the foaming material is foamed.

The raw material tank 20 includes a first tank 21 to which polypropylene 2A is supplied, and a second tank 22 to supply corn starch 2B and talc 3A, and to accommodate a mixture of these uniformly. do.

The silo 30 simultaneously accepts various raw materials 2A, 2B and 3A supplied from the raw material tank 20 and automatically supplies a predetermined amount of various raw materials 2A, 2B and 3A into the cylinder 50 automatically. Can be. The silo 30 has a first silo 31 connected to the first tank 21 via a pipe 30A, and a second silo 32 connected to the second tank 22 via a pipe 30B. Equipped.

The first silo 31 temporarily receives the polypropylene 2A and supplies the polypropylene 2A into the cylinder 50. The silo main body 33 with a bowl-shaped tape is formed, Vibration mechanism 34 for vibrating by vibrating the side portion 33A of the silo main body 33 is provided. Since the polypropylene 2A has a relatively high fluidity, it is not necessary to provide the vibrating mechanism 34.

The vibrating mechanism 34 includes a motor 341 and a cam 342 mounted to the motor 341. The cam 342 is rotated by the driving of the motor 341, and the tip of the cam 342 is rotated. 342A periodically strikes the side portion 33A of the silo body 33.

As a result, the side portions 33A of the silo main body 33 vibrate, even though the polypropylenes 2A are fixed to each other in the silo main body 33, the fixing thereof is released and the polypropylene 2A is a bowl-shaped tape. Falls along and moves toward the cylinder 50.

The second silo 32 temporarily receives the cornstarch 2B and the talc 3A and supplies these raw materials 2B and 3A into the cylinder 50. As described above, the silo main body 33 and Vibration mechanism 34 is provided.

The fluid tank 40 accommodates water 41, which is a foaming fluid, passes through the pipe 40A connected to the path between the silo 30 and the screw 70, and passes the water 41 into the cylinder 50. It is to supply.

The cylinder 50 is a hollow case for accommodating the foam material 1 supplied from the silo 30 and the water 41 supplied from the fluid tank 40, and includes a cylinder body 51 and a cylinder body ( The discharge part 52 located in the left side of FIG. 1 of 51 is provided.

2 is an exploded perspective view showing a portion of the cylinder 50 and the die 80. As shown in Fig. 2, the cylinder body 51 has an elliptical opening 51A for discharging the mixed material A, which is a mixture of the raw materials 1, 41, 51A, and the upper and lower sides of the opening 51A. In total, four bolt holes 51B are formed, two each.

The discharge part 52 is provided with a fitting hole 52A for exposing the opening portion 51A and the four bolt holes 51B and fitting a part of the die 80.

In FIG. 1, the heater 60 independently heats six portions 50A to 50F of the cylinder 50, and six heater bodies 61A mounted to each portion 50A to 50F of the cylinder 50. 61F) and the control part 62 which controls the temperature of these six heater bodies 61A-61F, respectively.

Specifically, the six parts 50A to 50F of the cylinder 50 are set in six steps as follows sequentially from the right side in FIG. Here, the temperature setting may vary depending on the raw materials used, the water content in the raw materials, and the weather conditions.

 (1) First portion 50A: 80 ° C. (initial temperature)

 (2) Second portion 50B: 145 ° C

 (3) Third portion (50C): 185 ° C

 (4) Fourth portion 50D: 175 ° C

 (5) Fifth portion 50E: 170 ° C

 (6) 6th part 50F: 230 degreeC (final temperature)

Here, the heater body 61 can display the set temperature and the actual measured temperature of each portion 50A to 50F.

The screw 70 mixes the foam material 1 and the water 41 supplied in the cylinder 50, transports the mixed material A, and discharges the gas to the outside via the discharge part 52 of the cylinder 50. It is provided with two screw main bodies 71 and 72 and the drive part 73 which rotates them, and has a biaxial structure.

The two screw bodies 71 and 72 are disposed adjacent to each other in the cylinder 50 so as to be substantially parallel to each other. Two screw bodies 71 and 72 are formed with threaded portions 71A and 72A, respectively. These threads 71A and 72A face the same direction.

The drive part 73 rotates the two screw main bodies 71 and 72 in the mutually adjacent direction.

Therefore, in the cylinder 50 to which the mixed material A is supplied, when the two screw bodies 71 and 72 are rotated in the same direction by the drive of the drive unit 73, the mixed material A is screwed into the threads 71A, 72A) is conveyed to the discharge part 52 direction.

As shown in FIGS. 1 and 2, the die 80 forms a void in the mixed material A discharged from the discharge portion 52 of the cylinder 50 to form the foam B and the foam ( A metal member having a function of forming B), comprising a first block 81 consisting of four members and a second block 83 mounted on the discharge side of the first block 81.

The first block 81 includes a fitting protrusion 811 fitted to the fitting hole 52A of the discharge portion 52 of the cylinder 50 and a first block body 812 having a rectangular parallelepiped shape.

In the first block body 812, a plurality of small holes 82A having the same diameter are formed on the opposite side of the fitting protrusion 811. As shown in FIG. Each small hole 82A has a diameter of 2.0 mm.

3 is a front view showing a surface opposite to the fitting protrusion 811 in the first block body 812.

As shown in Fig. 3, the plurality of small holes 82A define a spherical portion 812A that is formed wide in the horizontal direction in one direction orthogonal to the extrusion direction, and this spherical portion 812A In the position (T) for equally dividing the lengths of the four vertex positions (S) and the spherical portion (812A) of), and the rectangle (X) composed of four adjacent positions, formed at the diagonal intersection position (U). It is. That is, the plurality of small holes 82A are arranged so that the area and shape (patch pattern) of the triangle defined by three adjacent small holes 82A are evenly distributed. This spherical portion 812A has a shape corresponding to the extrusion shape.

Further, in the first block body 812, four bolt insertion holes in total are provided at the positions corresponding to the four bolt holes 51B of the cylinder body 51, respectively, on the upper and lower sides of the spherical portion 812A. 812B is formed.

In FIG. 2, the second block 83 forms a void in the mixed material A to form a foam B having a predetermined shape in cross section. The second block 83 is a plate-shaped base portion 831 mounted on the first block 81 and a hollow case shape having a predetermined length dimension in the extrusion direction formed on the base portion 831. ).

In the base 831, a position corresponding to the plurality of small holes 82A of the first block 81, that is, a spherical opening 831A corresponding to the spherical portion 812A, is formed.

In the base portion 831 of the third block 83, four wedges are positioned at positions corresponding to the four bolt insertion holes 812B of the first block 81 above and below the opening 831A. 83B is formed.

In the case-shaped shaping | molding part 832, the supply side opening part 832A is formed in the surface corresponding to the opening part 831A in the surface on the side of the opening part 831A. Moreover, the injection side opening part 832B of the same form as the supply side opening part 832A is formed in the surface which opposes the side surface of the opening part 831A. In addition, the molding part 832 is configured to detachably attach the upper surface 832Z of the case, so that the upper surface 832Z can be detached to expose the interior and can be easily cleaned.

In the die 80 as described above, each of the blocks 81 and 82 has four bolts 86 inserted into the corresponding wedges 83B, the bolt insertion holes 812B, and the bolt holes 51B, respectively. It is fixed to the cylinder 50.

In FIG. 1, the belt conveyor 90 conveys the foam B discharged from the injection-side opening 832B of the second block 83 that constitutes the die 80, and performs rough cutting of the foam B. . Although not shown, the conveying path of the belt conveyor 90 is provided with a press roller and a coarse cutting cutter for adjusting the thickness of the product. The coarse cutting cutter adjusts the width of the product according to the conveyor speed of the belt conveyor 90. A cooling fan for cooling the foam B and a cutting device for cutting the foam B are provided. By this arrangement the foam B is composed of the final product and then stored in a predetermined box. The final product stored in this box is properly enclosed in a bag and shipped as a product.

Next, the manufacturing procedure of foam (B) is demonstrated.

(1) The predetermined amount of polypropylene 2A is further removed from the first silo 31 by tapping 33A of the side parts of the silo main body 33 by the respective vibrating mechanisms 34 to the tip of the cam 342. Predetermined amounts of the raw materials 2B and 3A are supplied from the two silos 32 into the cylinder 50. Then, a predetermined amount of water 41 is supplied from the fluid tank 40 to the raw material supply path between the screw 70 and the silo 30.

(2) Each of the raw materials 2A, 2B, 3A and water 41 supplied to the screw 70 portion in the cylinder 50 are mixed by the rotation of the screw 70 to form a mixed material A to form a die 80 It is conveyed to the side.

At this time, the polypropylene 2A is completely melted when heated by the heater 60 and brought to a melting point of 160 ° C. or more, that is, when transported to a position after the third portion 50C. The other raw materials 2B and 3A are uniformly dispersed in the molten polypropylene 2A.

On the other hand, the water 41 is heated by the heater 60 but since the first portion 50A of the cylinder 50 is set at 80 ° C., the water 41 is not completely vaporized at the position of the first portion 50A. Almost all liquid. Thereafter, at the position after the second portion 50B, it is heated above the vaporization temperature, vaporized to vaporize, and condensed by the pressurized environment between the cylinder 50 and the raw material conveyed later and the die 80. Accordingly, water in a state where water vapor and a liquid are mixed is included in the mixed material (A).

(3) The mixed material A discharged from the cylinder 50 by the rotation of the screw 70 is adjusted to a predetermined temperature by the temperature control device 100 to form a plurality of small holes 82A formed in the first block 81. Extruded into a plurality of elongate forms.

(4) At this time, the elongated mixed material A having passed through the small hole 82A suddenly decreases in pressure and thus explodes into a plurality of elongated foams B corresponding to the plurality of small holes 82A. do. Such elongate foam B is integrally brought into close contact with each other without any gap since the plurality of small holes 82A are uniformly arranged as described above.

Here, the water 41, which is a foaming fluid, has a volume 1200 times when it is vaporized. In the mixed material (A), water 41 is excessively required to dissolve the hydrophilic component of the additive added to produce uniform foaming and to generate a sufficient water vapor explosion (foaming). On the other hand, the addition of excess water 41 absorbs latent heat as it is extruded from the die 80 and evaporated, so that the water vapor inside the foam tissue can return to the liquid water, and into the liquefied water 41. As a result, the volume of the foam B is reduced, and there is a possibility that the tissue shrinks and a sufficient foam cannot be obtained. At this time, the absorbed energy is 2.26MJ / Kg (equivalent to 539Kcal / Kg). Therefore, in order to secure the absorbed energy, the thermostat device 100 continuously heats the die 80 to promote vaporization of the water 41 to suppress shrinkage of the foam B.

In addition, the pressure for extruding the mixed material A from the die 80 needs to be ensured as follows in response to the set temperature of the die 80 when the foaming fluid is water 41. The results are summarized in Table 1.

Set temperature 160 ° C: 0.618 MPa (6.3 Kgf / cm ² equivalent) or more

Set temperature: 170 ° C: 0.795 MPa (8.1 Kgf / cm ² equivalent) or more

Set temperature 180 ° C: 1.000 MPa (10.2 Kgf / cm ² equivalent) or more

Set temperature 190 ° C: 1.255 MPa (12.8 Kgf / cm ² equivalent) or more

In the case where the foaming fluid is not water, it is necessary to ensure the extrusion pressure to be 1.28 MPa (13 Kgf / cm ² or more) or more.

TABLE 1

Temperature of Thermostat (℃) Pressure (MPa) 160 0.618 170 0.795 180 1.000 190 1.255

(5) The integrated foam B is supplied into the molded part 832 of the second block 83 via the opening 831 A of the base 831 and the supply side opening 832 A of the molded part 832. .

(6) The foam B supplied into this molding portion 832 is formed in a plate shape having a spherical cross section while being transported to the injection-side opening portion 832B as shown in FIG. It is extruded and shape | molded outside through 832B.

(7) The plate-shaped continuous foam B discharged from the injection side opening portion 832B is conveyed through the belt conveyor 90. The conveyed foam (B) is appropriately cut to form a predetermined form.

Foam B is manufactured in the above order.

According to the present embodiment as described above, the following effects are obtained.

(1) Since the water 41 supplied into the cylinder 50 is heated stepwise by the heater 60 together with the conveyance of the screw 70, the water 41 of the water 41 is heated at the same time as compared with the case of heating up to the vaporization temperature or more. It is possible to prevent the water 41 from flowing back to the tank side without being affected by a sudden expansion change or the like. In addition, since the water 41 is supplied to the supply path between the screw 70 and the silo 30, the water 41 is not directly supplied to the screw 70 in the cylinder 50. It is not influenced by the change of the water 41 in the), and it is possible to more surely prevent the water 41 from flowing back to the tank 40 side. As mentioned above, since backflow to the tank 40 side can be prevented, the foam B of stable quality can be manufactured efficiently.

(2) Even if water 41, which can be easily obtained, is used as a raw material, the reverse flow of water 41 can be prevented by dividing into six stages and heating. Therefore, the foam (B) whose quality is stable can be manufactured at low cost with high efficiency.

(3) By vibrating the side portions 33A by tapping the side portions 33A of the silos 31 and 32 through the vibrating mechanism 34, the raw materials 2A, 2B and 3A in each silo 31 and 32 are vibrated. ) Can be fixed, and each of the raw materials 2A, 2B, and 3A in powder form can be smoothly supplied into the cylinder 50. At this time, the cam 342 is mounted on the motor 341, and the tip of the cam 342, which is rotated by the driving of the motor 341, merely vibrates the side portions 33A of the silos 31 and 32, thereby vibrating. The mechanism 34 can be configured simply.

(4) Since the heater 60 can adjust the heating temperature of six parts 50A-50F of the cylinder 50 simultaneously with one control part 62, temperature control becomes simple. In addition, since the heater 60 can adjust the temperature by dividing the cylinder 50 into six stages, it is possible to manufacture the foam B of higher quality by suitably changing according to the situation and environment at the time of manufacture.

(5) Since the arrangement pattern of the triangle defined by the three small holes 82A adjacent to each other is formed in the first block 81, a plurality of small holes 82A are formed in the same manner, the quality of the shape of the foam B, etc. Can be stabilized simply. At this time, since the diameter of the small hole 82A is 2.0 mm, it can be foamed more favorably and molding of a stable shape is possible.

(6) Since the temperature of the die 80 is adjusted to a temperature between 160 ° C and 220 ° C through the temperature regulating device 100, unnecessary shrinkage can be suppressed and ensured foaming. It can manufacture.

(7) In the first block 81, a fitting protrusion 811 is fitted to the fitting hole 52A of the discharge portion 52 of the cylinder 50, so that the first block 81 is the discharge portion ( 52 can be prevented from being released. In addition, there is an advantage that can prevent the discharge of steam due to high pressure.

(8) In the second block 83, the molded part 832 has a certain length in the extrusion direction, so that the foam B in the molded part 832 can be sufficiently molded.

(9) In the second block 83, since the upper surface 832Z can be freely attached and detached, the interior can be easily cleaned after manufacture.

(10) Since the screw 70 has a biaxial (71, 72) structure, the foaming material (1) and water (41) can be mixed more uniformly than in the case of a single axis, and the foam (B) after extrusion molding This can stabilize the quality.

(11) Since the main component is a non-resin component which can be treated as general waste, the foam (B) does not correspond to the component to be recycled by the container regeneration method. Because of this, the foam (B) can be disposed of as general waste, so that the cost can be lowered and simply disposed. At this time, since the content of the resin component is smaller than that of the general foam, not only the amount of heat generated during incineration but also no graphite or the like can be generated to protect the environment. Even in this case, the foam (B) which can be used sufficiently as an actual product can be manufactured.

(12) Since the foam (B) is flexible by the voids formed therein, it can be used as a cushioning material of a fragile article such as precision instruments or fruits. Moreover, since foam (B) has a comparatively high specific heat, it can be used also as a heat insulating material.

(13) Polypropylene (2A) was used as the resin component, but since the polypropylene (2A) is superior in processability, mechanical properties, and the like as compared with other resin components, the foam (B) can be easily produced.

(14) Since corn starch 2B, which is an easily obtained cheap vegetable material, is used as a raw material, it is possible to reduce the manufacturing cost of the foam (B) and to simplify the production.

(15) Since the foam (B) is finally formed in a plate shape, not only flexibility but also a certain degree of rigidity can be secured. For example, the foam (B) can be used as a packaging plate or a heat insulating material for individually packaging fruits or vegetables. . In addition, since the foam (B) has sufficient recoverability and is hardly dissolved in water, the foam (B) can be sufficiently used as a packaging buffer.

Second Embodiment

Next, a second embodiment of the present invention will be described with reference to the drawings.

The extrusion molding machine 12 which concerns on 2nd Embodiment of this invention differs in the part corresponding to the extrusion molding machine 11 and die 80 which concerns on said 1st Embodiment, and the other structure is totally identical. Therefore, the cutter 200 which is a part provided instead of the die 80 is demonstrated.

The same or equivalent components as those in the first embodiment are denoted by the same reference numerals to omit or simplify the description.

5 is a view schematically showing an extruder 12 according to the present invention.

6 is an enlarged view of the cutter 200.

As shown in FIG. 5, the cutter 200 forms a foam B by foaming the mixed material A extruded from the cylinder 50 and cuts the foam B. FIG. The cutter 200 includes a mounting unit 210 and a cutter body 220 mounted to the discharge unit 52 of the cylinder 50.

As shown in FIG. 6, the mounting portion 210 is mounted to the discharge portion 52 of the cylinder 50 to foam the mixed material A extruded from the cylinder 50 and to function as a die. And a hollow case-shaped base material 211 and a plate-shaped auxiliary member 212 formed on the surface of the extrusion side of the base material 211.

The auxiliary member 212 is formed with a penetrating small hole 212A.

In the base material 211, a fitting portion (not shown) fitting to the fitting hole 52A of the discharge portion 52 of the cylinder 50 is formed on the surface of the cylinder 50 side, and the fitting portion has a rectangular opening. Is formed.

Further, a hole (not shown) larger than the small hole 212A is formed in the surface 211X on the side of the auxiliary material 212, which is the surface on the extrusion side, at a position corresponding to the small hole 212A.

Therefore, the mixed material A extruded from the cylinder 50 passes through the inside of the base 211 and is extruded from the small hole 212A of the auxiliary member 212. When extruded, the mixed material (A) is reduced in pressure and foamed into foam (B).

The cutter body 220 is a portion for supporting the mounting portion 210 and cutting the foam B extruded from the mounting portion 210 to a predetermined length, and the shaft member 221 and the shaft member 221. And a supporting member 225 for supporting.

The shaft member 221 is a part for cutting the extruded foam B, and includes a shaft body 222 and a blade 223 mounted at the tip of the shaft body 222.

The shaft body 222 is configured to be rotatable at a constant speed by a drive mechanism such as a motor (not shown). The rotation speed can be adjusted by controlling the drive mechanism.

The blade 223 has two blades 223A and 223B which are parallel to each other in a direction perpendicular to the axis main body. The two blades 223A and 223B face the rotational direction indicated by the arrow C in the figure, respectively, on the edge 224 of the blade. As a result, for example, the blade tip 224 passes through the small hole 212A twice while the blade 223A rotates one direction in the direction of the arrow C. FIG.

The support member 225 is a member supporting the shaft body 222 and the mounting portion 210.

In the extruder 12 as described above, the mixed material A extruded from the cylinder 50 passes through the inside of the base 211 and is extruded from the small hole 212A of the auxiliary member 212. When extruded, the mixed material (A) is foamed after the pressure is reduced to form the foam (B).

The foam B extruded from the small hole 212A is cut into a predetermined length by two blades 223A and 223B which rotate together with the rotation of the shaft body 222. For this reason, as shown in FIG. 7, the cylindrical foam B is formed in predetermined length of about 10 cm, for example.

According to the present embodiment as described above, the following effects can be additionally provided in addition to the effects as in (1) to (15) of the first embodiment.

(16) By controlling only the rotation speed of the shaft main body 222, the foam B of any length can be easily produced.

(17) By changing the shape or size of the small holes 212A of the auxiliary member 212, the foam B of any cross-sectional shape can be easily produced.

(18) Since the foam (B) is formed in a relatively small cylindrical shape, it can be installed without any gap even when used as a packing cushion for precision equipment, and the internal precision equipment can be reliably protected.

[Modification]

This invention is not limited to each said embodiment, The deformation | transformation, improvement, etc. within the range which can achieve the objective of this invention belong to the scope of this invention.

For example, although polypropylene (2A) was used as a foaming material, it is not limited to this, Another thermoplastic resin can also be used. Although corn starch 2B, talc 3A, etc. were added here, such raw materials may not be added or other raw materials may be added. For example, in addition to the above-mentioned blending ratio, a mixture of materials such as wood powder, activated carbon, rice straw and the like may be used. At this time, it is preferable to add such a material so that the mixture can exhibit an adsorption function, a bacterium, and a mold suppression function. In summary, the formulation of the foaming material 1 is not particularly limited.

In each of the above embodiments, water 41 is used as the foaming fluid, but the present invention is not limited thereto. For example, other fluids such as oil may be used.

In each said embodiment, although the initial temperature was set to 80 degreeC, it is not limited to this and can also be set to 50 degreeC etc., for example. In addition, the initial temperature may be set above the vaporization temperature depending on the raw material.

In each of the above embodiments, the final temperature is set to 230 ° C., but the present invention is not limited thereto. For example, the final temperature may be set to 150 ° C., for example, the temperature at which the foaming fluid is completely vaporized, and the temperature at which the foaming material can melt. You just need

In each of the above embodiments, the heater 60 is set in six stages. However, the heater 60 is not limited thereto. For example, the heater 60 may be set in three stages.

In each of the above embodiments, each of the raw materials 2 and 3 is in a powder state, but may be used in a roughly crushed state.

In each of the above embodiments, the vibrating mechanism 34 is constituted by the motor 341 and the cam 342. However, the present invention is not limited thereto, and other mechanisms such as an electronic vibrating mechanism may be used. However, in the case of the same as the above embodiment, there is an advantage that the raw material supply can be carried out more efficiently.

Moreover, in each said embodiment, although the vibration mechanism 34 was provided in both silos, you may provide in either silo. In addition, if the raw material can be supplied sufficiently efficiently, it is not necessary to install it in particular.

Although the screw 70 was comprised in the biaxial structure in each said embodiment, it is not limited to this, It can also be comprised by the uniaxial structure.

In the second embodiment, the number of blades 223 is set to two, but the number of blades 223 can be set to one.

EXAMPLE

[Examples 1-3]

In the first embodiment, the diameter of the small hole 82A was as follows. In addition, in each Example, the diameter of the small hole 82A and the state (performance and state) of foam are shown in Table 2.

Diameter of eyelets (82A): 1.8 mm, 2.0 mm, 2.2 mm

In this case, a well-expanded foam (B) was obtained.

TABLE 2

Diameter (mm) State of the foam Example 1 1.8 Good Example 2 2.0 Good Example 3 2.2 Good Comparative Example 1 1.5 There is not enough foam Comparative Example 2 2.4 There is not enough foam

[Comparative Examples 1 and 2]

In the said 1st Embodiment, the rest is the same as that of the said Examples 1-3 except having made the diameter of 82 A of small holes as follows. In each comparative example, the diameter of the small hole 82A and the state (performance and state) of the foam are also shown in Table 2.

Diameter of eyelet (82A): 1.5 mm, 2.4 mm

In this case, the foam (B) including the part which is not foamed sufficiently may be formed.

EXAMPLES 4-7

In the first embodiment, the set temperature of the die 80 is set as follows through the temperature controller 100. In addition, in each Example, the set temperature and the form of the foam are shown in Table 3.

Set temperature of the thermostat 100: 160 ℃, 180 ℃, 200 ℃, 220 ℃

In this case, a foam (B) formed in a good shape was obtained.

TABLE 3

Temperature of Thermostat (℃) Form of foam Example 4 160 Good Example 5 180 Good Example 6 200 Good Example 7 220 Good Comparative Example 3 Room temperature There is not enough foam Comparative Example 4 240 There is a part where deterioration is caused by deterioration

[Comparative Examples 3 and 4]

In the first embodiment described above, the rest of the dies 80 are the same as in the above-described Examples 4 to 7 except that the set temperature of the die 80 is changed as follows. In each comparative example, the set temperature of the thermostat 100 and the form of the foam are also shown in Table 3.

Temperature of the thermostat 100: room temperature, 240 ℃

When the set temperature is room temperature, a foam (B) including a portion which is not formed in an appropriate form may be formed in some cases.

In addition, when setting temperature is 240 degreeC, the pressurization by heat deterioration may arise because of excessive heating of the mixed material (A).

The present invention can be used as an extruder for molding a foam having a small void formed therein, and in the manufacture of a packaging buffer for protecting the fragile items such as precision devices such as electronic devices, electronic parts or fruits from damage from external impacts. Available.

Claims (8)

 In an extrusion molding machine for supplying a foam material constituting the foam, a cylinder and screw for mixing and conveying the foam material supplied to the silo, and molding the foam through a die connected to the cylinder tip, A tank connected to a supply path between the silo and the screw to receive a foaming fluid for foaming the foamed material; A heater for heating the foam material step by step from the silo side base end of the cylinder to the die front end from an initial temperature lower than the vaporization temperature of the foaming fluid to a final temperature at which the foaming fluid is completely vaporized; Extruder, characterized in that provided. The method of claim 1, The foaming fluid uses water, Wherein the heater is the initial temperature is set to 60 ° C or more and less than 100 ° C, the final temperature is set to 160 ° C or more and less than 240 ° C, the extrusion molding machine characterized in that to heat the foaming material and the foaming fluid in six stages. The method of claim 1, The foamed material is formed in a granular form, And an oscillating mechanism for intermittently vibrating the side portions of said silo. The method of claim 3, wherein The vibration mechanism includes a motor and a cam mounted to the motor, And the cam vibrates the silo by intermittently tapping the side portion of the silo according to the driving of the motor. The method according to any one of claims 1 to 4, The die is formed with a plurality of holes for extrusion, And said plurality of holes are equally distributed in the form of a triangle defined by three adjacent holes. The method of claim 5, The plurality of holes are each formed in a circular shape, The diameter of the circular hole is an extrusion molding machine, characterized in that 1.8mm ~ 2.2mm. The method of claim 5, And a temperature controller for controlling the die to a temperature between 160 ° C and 220 ° C. The method of claim 5, And a cutter installed on the cylinder side instead of the die to cut the foam extruded from the cylinder by rotating at a constant speed.

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