TWI780575B - Supercritical fluid material squeezing injection molding machine - Google Patents

Abstract

A supercritical fluid material squeezing injection molding machine includes a material squeezing unit, a supercritical fluid supply unit, and an injection unit. The material squeezing unit and the injection unit both have a pipe body and a material guiding rod. Each pipe body has a chamber in which the respective material guiding rod extends. The chamber in the material squeezing unit is divided into a guiding area and a mixing area. The material guiding rod of the material squeezing unit guides the foaming material through the guiding area to become a melting status to be conveyed to the mixing area. The supercritical fluid supply unit introduces the supercritical fluid to the mixing area to be mixed with the foaming material. The mixed foaming material is then guided into the chamber, so as to be injected into the mold.

Description

Supercritical Fluid Batch Injection Molding Machine

The invention relates to an injection molding machine, especially a supercritical fluid charge injection molding machine.

At present, many products on the market are made of foam molding, such as the soles of sports shoes, slippers, floor mats and yoga mats, etc., because they are formed of foam materials, they have soft properties, so It has a more comfortable feeling when wearing or using, so it is loved by many consumers.

However, the foaming materials used for foam molding, such as polyethylene (PE) or ethylene/vinyl acetate copolymer (Ethylene Vinyl Acetate, EVA), must be added with organic solvents such as foaming agents and bridging agents. A chemical foaming reaction can occur in the manufacturing process to form foams. Although the above-mentioned articles can be made by this method, it also causes pollution due to the use of a large amount of organic solvents. How to solve this problem is the main focus of the present invention .

In order to solve the above problems, the present invention provides a supercritical fluid injection molding machine, It is to mix foaming raw materials with supercritical fluid, and complete foaming and forming through physical foaming.

An embodiment of the present invention provides a supercritical fluid injection molding machine, which mainly includes a feeding unit, a supercritical fluid supply unit, and an injection unit. The feeding unit includes a first pipe body and a first guide rod. There is a first chamber through the first pipe along its length direction. The first guide rod extends in the first chamber and can be driven to rotate. , the first chamber is divided into a material guide area and a mixing area, the first material guide rod guides the foaming raw material to pass through the material guide area and is sent to the mixing area in a molten state; the supercritical fluid supply unit is connected to the first pipe body and directly The mixing zone is turned on to introduce supercritical fluid into the mixing zone, and the first guide rod is driven to rotate to mix with the foaming raw material; the injection unit includes a second pipe body and a second guide rod, and the second pipe body There is a second chamber penetrating along its length direction. The second guide rod is extended in the second chamber and can be driven to rotate. The second chamber communicates with the mixing zone. In the mixing zone, it is mixed with supercritical fluid. The foaming raw material is introduced into the second chamber, and is conveyed through the second guide rod and stored at the front end of the second chamber, so that it can be formed by physical foaming after being injected into a mold.

In this way, without adding organic solvents such as foaming agent and bridging agent, the foaming material can be mixed with supercritical fluid in the mixing zone, then injected into the mold, and formed by physical foaming The finished product of the mold is scheduled to solve the problem of pollution caused by the addition of organic solvents such as foaming agents and bridging agents, so as to achieve the effect of environmental protection in the foaming process.

100: Supercritical fluid injection molding machine

10: Feeding unit

11: The first tube body

111: Hopper

12: The first guide rod

121: screw section

122: Mixing section

123: Bump

124: oblique cone

125: oblique cone

13: The first chamber

131: guide area

132: Mixed area

14: check ring

141: channel

142: oblique concave part

15: block

151: Through hole

16: Electric motor

20:Supercritical fluid supply unit

21: bottle body

22: pipeline

23: Booster pump

24: Gas cylinder

30: Injection unit

31: Second pipe body

32: The second guide rod

321: oblique cone

33: The second chamber

34: check ring

341: channel

342: oblique concave part

35:Hydraulic motor

36: drive cylinder

37: guide rail

40: air valve

A: Foaming material

M: Mold

Fig. 1 is the schematic diagram of the supercritical fluid injection molding machine of the embodiment of the present invention.

Fig. 2 is a schematic diagram of the foaming raw material feeding and conveying through the screw section in the material guiding area of the embodiment of the present invention.

Fig. 3 is a schematic diagram of introducing supercritical fluid and mixing foaming raw materials in the mixing zone of the embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view seen on line 4-4 in Fig. 3 .

Fig. 5 is a schematic diagram of the injection unit according to the embodiment of the present invention, with the foaming material being introduced into the second chamber.

Fig. 6 is a partially enlarged view of block a shown in Fig. 3 .

Fig. 7 is a partially enlarged view of block b shown in Fig. 3 .

Fig. 8 is a partially enlarged view of block c shown in Fig. 5 .

Fig. 9 is a schematic diagram of the injection unit injecting foaming material into the mold according to the embodiment of the present invention.

In order to illustrate the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, it is expressed in specific embodiments. Various objects in the embodiments are drawn according to proportions, sizes, deformations or displacements suitable for illustration, rather than drawn according to the proportions of actual components, which are described first.

1 to 9, the present invention provides a supercritical fluid injection molding machine 100, which includes a feeding unit 10, a supercritical fluid supply unit 20, and an injection unit 30, and in this implementation In the example, an air valve 40 is further included, wherein: the feeding unit 10 includes a first pipe body 11 and a first guide rod 12, and a first cavity through the first pipe body 11 along its length direction Chamber 13, the first material guide rod 12 is extended in the first chamber 13 and can be driven to rotate, the first chamber 13 is divided into a material guide area 131 and a mixing area 132, the first material guide rod 12 is used to guide The foam-initiating raw material passes through the material guide zone 131 and is then sent to the mixing zone 132 in a molten state. The raw material is melted through the material guide area 131, which is caused by heating the foaming raw material with a heater (not shown) in the first pipe body 11. The heater is, for example, along the first pipe body. The periphery of 11 is uniformly arranged.

In this embodiment, the first material guide rod 12 has a screw section 121 in the material guide area 131, and has a mixing section 122 in the mixing area 132, and the screw section 121 is guided by its screw thread to cause foaming raw material To the direction of the mixing zone 132, the mixing section 122 is used to mix the foaming material and the supercritical fluid. The mixing section 122 is a plurality of bumps 123 in the first guide rod 12 in this embodiment. Formed completely, the foaming material and the supercritical fluid can be fully agitated by the bumps 123 having intervals to achieve a uniform mixing effect, but the mixing section 122 is filled with bumps 123 intervals only A preferred implementation mode, the present invention is not limited thereto.

In this embodiment, the first material guide rod 12 has an oblique cone portion 124 at the front end of the screw section 121, and also has an oblique cone portion 125 at the front end of the mixing section 122, the oblique cone portion 124 and the oblique cone portion 125 All of them are tapered from wide to narrow toward the conveying direction of the foaming material. The first material guide rod 12 of the present embodiment corresponds to the oblique cone portion 124 and the oblique cone portion 125, and a non-return ring 14 is sleeved respectively. shown), the channel 141 of each non-return ring 14 can flow through when the foaming material is molten, and the oblique concave portion 142 of each non-return ring 14 is relatively stopped by the corresponding oblique cone portion 124 or oblique Taper 125 .

Based on the above, the first material guide rod 12 of this embodiment has a stopper 15 at the front end of the screw segment 121, and the non-return ring 14 arranged at the front end of the screw segment 121 is arranged on the inclined cone part 124 and the Between the stoppers 15 , the stoppers 15 are radial along the radial direction of the screw segment 121 (as shown in FIG. 4 ), thus forming a plurality of through holes 151 for the foaming material to pass through. When the foaming material is guided by the screw section 121 and flows toward the mixing zone 132, the non-return ring 14 is pushed by the foaming material and moves toward the direction of the mixing zone 132 until the non-return ring 14 is stopped by the stopper 15 At this time, the foaming material can pass through the channel 141 of the non-reverse ring 14 by the force of being pushed, and then enter the mixing zone 132 through the through hole 151 of the stopper 15 .

The supercritical fluid supply unit 20 is connected to the first pipe body 11 and directly leads to the mixing zone 132 to introduce the supercritical fluid to the mixing zone 132, and the first material guide rod 12 is driven to rotate with the foaming The ingredients are mixed. The supercritical fluid, in this embodiment, carbon dioxide (CO ₂ ) is taken as an example, but not limited to carbon dioxide (CO ₂ ), for example, water (H ₂ O) or methane (CH 4 ) can also be used in the present invention. the supercritical fluid.

In the present embodiment, the supercritical fluid supply unit 20 includes a bottle body 21, which is a steel cylinder in the present embodiment to store the supercritical fluid; the supercritical fluid supply unit 20 of the present embodiment is also provided with a The pipeline 22 connects the bottle body 21 and the mixing area 132 with the setting of the pipeline 22, and a pressurizing pump 23 is arranged in the middle of the pipeline 22 between the bottle body 21 and the mixing area 132, and the pressurizing pump 23 drives the pressurizing pump. Pressure makes the supercritical fluid released by the bottle body 21 introduced into the mixing zone 132 through the pipeline 22, so as to be fully mixed with the foaming raw material in the mixing zone 132 by the action of the mixing section 122. Preferably, in this embodiment, a gas storage bottle 24 is provided halfway between the pressurization pump 23 and the pipeline 22 of the mixing zone 132. When the pressurization pump 23 is driven to pressurize, the pressure can be stored in the gas storage bottle 24. To ensure that the supercritical fluid is maintained at high pressure and delivered to the mixing zone 132 .

The injection unit 30 includes a second tube body 31 and a second material guide rod 32. There is a second chamber 33 penetrating through the second tube body 31 along its length direction, and the second material guide rod 32 extends In the second chamber 33 and can be driven to rotate, the second chamber 33 communicates with the mixing zone 132, the foaming material mixed with the supercritical fluid in the mixing zone 132 is introduced into the second chamber 33, and Continue to be conveyed through the second guide rod 32 and stored in the front end of the second chamber 33, so as to be injected into a mold M and formed by physical foaming. In this embodiment, the second guide rod 32 and the screw section 121 are both screws.

In this embodiment, the front end of the second material guide rod 32 has an oblique cone portion 321, and the oblique cone portion 321 is tapered from wide to narrow toward the conveying direction of the foaming raw material. The second material guide rod 32 corresponds to The oblique cone part 321 is provided with a non-return ring 34, and this non-return ring 34 has a passage 341 and an oblique recess 342 (as shown in Figure 8), the passage 341 is available for the circulation of the foaming material, and the non-return ring The oblique concave portion 342 of 34 can relatively stop against the oblique cone portion 321 .

In this embodiment, the first material guide rod 12 and the second material guide rod 32 are connected to a driving horse respectively. up to be driven to rotate. Preferably, the first material guide rod 12 of the present embodiment is connected with an electric motor 16 (such as an AC motor), and the first material guide rod 12 is powered by the electric motor 16 to be driven to rotate; the second guide rod 12 of the present embodiment The material rod 32 is then connected with an oil hydraulic motor 35, which is connected with a hydraulic system (not shown in the figure), and the second material guide rod 32 is driven to rotate by the oil pressure motor 35. The second material guide rod 32 of this embodiment is also connected with a drive cylinder 36, which is also a hydraulic cylinder in this embodiment, and the drive cylinder 36 is combined with the hydraulic motor 35, and the hydraulic motor 35 is erected On the pair of guide rails 37 , the second material guide rod 32 can be driven to linearly displace in the second chamber 33 by the action of the driving cylinder 36 .

In the actual operation of the supercritical fluid injection molding machine 100 of the above embodiment, the foaming material A is poured into the hopper 111 provided on the first pipe body 11, and the first material guide rod 12 is driven by the electric motor 16 to rotate , the foaming raw material A is guided by the screw section 121 in the material guide area 131 and conveyed towards the direction of the mixing area 132 (as shown in Figure 2), and the foaming raw material A is gradually molten during the conveying process and passes through the stop. The channel 141 of the reverse ring 14 and the through hole 151 of the stopper 15 (as shown in FIG. 4 ).

As above, when the foaming material A enters the mixing zone 132, the supercritical fluid is also introduced into the mixing zone 132 (as shown in FIG. 3 ) along with the pressurization pump 23 driving pressurization and the pressure accumulation of the gas cylinder 24. When the supercritical fluid is in a liquid state, and is driven by the electric motor 16 to rotate by the first material guide rod 12, the mixing section 122 stirs and mixes the foaming material A and the liquid supercritical fluid in the mixing zone 132, and As the first guide rod 12 continues to rotate, the foaming material A mixed with supercritical fluid is introduced into the second chamber 33 (as shown in FIG. 4 ).

When the foaming material A mixed with supercritical fluid is introduced into the second chamber 33 , because the second guide rod 32 is rotated by the hydraulic motor 35 , the foaming material A is thus stored in the second chamber 33 The front end (as shown in Figure 5), and when the accumulated foaming raw material A reaches a preset weight, the electric motor 16 and the hydraulic motor 35 stop the first feed rod 12 and the second feed rod 32 Driven by it, the pushing force of the foaming material A on the non-return ring 14 and the non-return ring 34 disappears immediately, and the anti-return ring 14 is affected by the high pressure state contained in the supercritical fluid. It forms a reverse push action with the non-return ring 34, so that the oblique concave portion 142 of the non-return ring 14 stops at the oblique cone portion 124 and the oblique cone portion 125 respectively (as shown in Figures 6 and 7), and the oblique concave portion of the non-return ring 34 342 is also stopped at the inclined cone portion 321 (as shown in Figure 8), and the foaming material A in the second chamber 33 is maintained at a high pressure state by the anti-reverse effect produced by the non-reverse ring 14 and the non-reverse ring 34. Just can control drive cylinder 36 to drive second material guide rod 32 to push foaming material A, make foaming material A inject in the mold M (as shown in Figure 9), and when a predetermined time is about to arrive, can control gas The valve 40 releases the pressure and exhausts air before opening the mold, and when the predetermined time arrives, the foaming material A can be opened to produce physical foaming and form the finished product preset in the mold cavity of the mold M (not shown in the figure) .

From the above description, it is not difficult to find that the feature of the present invention is that, in the foaming process of the above-mentioned supercritical fluid injection molding machine 100, the foaming material A is mixed with the supercritical fluid in the mixing zone 132 and then injected. Into the mold M, that is, to form the finished product predetermined by the mold by physical foaming, without adding any organic solvents such as foaming agents and bridging agents, so as to solve the problem of pollution caused by organic solvents such as foaming agents and bridging agents, that is It can achieve the effect of environmental protection in the foaming process.

The above-mentioned embodiments are only used to illustrate the present invention, and are not intended to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention belong to the intended protection category of the present invention.

100: Supercritical fluid injection molding machine 10: Batch unit 11: The first pipe body 111: Hopper 12: The first guide bar 122: Mixing section 123: Bump 124: Oblique cone 125: Oblique cone 13: the first chamber 132:Mixed zone 14:Reverse check ring 15:Block                                                                                                                                                                                                                                                          20: Supercritical fluid supply unit 21: Bottle body 22:Pipeline 23:Boosting pump 24: Gas cylinder 30: Injection unit 31: Second pipe body 32: Second guide rod 321: Inclined cone 33: The second chamber 34: Non-return ring 35: Hydraulic motor 36:Drive cylinder 37:Guide rail 40: Air valve M: Mold

Claims (8)

A supercritical fluid feed injection molding machine, which includes: a feed unit, which includes a first pipe body and a first guide rod, the first pipe body has a first chamber penetrating along its length direction, The first material guide rod is extended in the first chamber and can be driven to rotate. The first chamber is divided into a material guide area and a mixing area. The first material guide rod guides the foaming material to pass through the material guide area. and then transported to the mixing zone in a molten state; a supercritical fluid supply unit, which is connected to the first pipe body and directly leads to the mixing zone, so as to introduce supercritical fluid into the mixing zone, and use the first feed rod Driven to rotate and mix with the foaming material; and an injection unit, which includes a second tube and a second guide rod, the second tube has a second chamber through its length, the The second material guide rod is extended in the second chamber and can be driven to rotate. The second chamber communicates with the mixing zone, and the foaming material mixed with the supercritical fluid is introduced into the mixing zone in the mixing zone. The second chamber is continuously conveyed through the second guide rod and stored at the front end of the second chamber, so as to be formed by physical foaming after being injected into a mold; wherein, the first guide rod is placed on the first guide rod There is a screw section for guiding the foaming raw material in the material guide area, and there is a mixing section for mixing the foaming raw material and the supercritical fluid in the mixing area, the first material guide rod The front ends of the screw section and the mixing section are respectively provided with an oblique cone portion tapered toward the conveying direction of the foaming raw material, and the first guide rod is respectively provided with a non-return ring corresponding to each of the oblique cone portions , each of the non-return rings has a channel for the foaming raw material to flow through, and has an oblique recess that can be relatively stopped at the corresponding oblique cone, and the first guide rod has a The stopper, the non-return ring at the front end of the screw segment is located between the corresponding oblique cone and the stopper, and the stopper is radial along the radial direction of the screw segment to form a plurality of foaming The through hole through which the raw material passes. The supercritical fluid injection molding machine according to claim 1, wherein the mixing section is formed by a plurality of bumps spaced on the first guide rod. The supercritical fluid injection molding machine as described in claim 1, wherein the supercritical fluid supply unit includes a bottle for storing the supercritical fluid, and a pipeline is provided to communicate with the bottle and the mixing zone, There is a pressurized pump in the middle of the pipeline between the bottle and the mixing zone, and the pressurized pump drives pressurization so that the supercritical fluid released from the bottle is introduced into the mixing zone through the pipeline. Area. The supercritical fluid injection molding machine as described in claim 3, wherein a gas storage bottle is provided in the middle of the pipeline between the pressurization pump and the mixing zone, and the pressurization pump is driven to pressurize the Accumulate pressure in the gas cylinder. The supercritical fluid injection molding machine according to claim 1, wherein the first guide rod and the second guide rod are respectively connected to a driving motor to be driven to rotate. The supercritical fluid injection molding machine according to claim 5, wherein the driving motor is an electric motor or a hydraulic motor. The supercritical fluid injection molding machine as described in Claim 5, wherein, the second guide rod is connected with a drive cylinder, and the foaming material is introduced and stored in the front end of the second chamber, and the The drive cylinder drives the second material guide rod to push the foaming material into the mold. According to the supercritical fluid injection molding machine described in Claim 1, an air valve is further provided in the mold to allow the mold to release pressure and exhaust air before opening the mold.

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