CN113263708B - Die structure for preparing micro-channel plastic product with high channel size controllability - Google Patents
Die structure for preparing micro-channel plastic product with high channel size controllability Download PDFInfo
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- CN113263708B CN113263708B CN202110743399.2A CN202110743399A CN113263708B CN 113263708 B CN113263708 B CN 113263708B CN 202110743399 A CN202110743399 A CN 202110743399A CN 113263708 B CN113263708 B CN 113263708B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
Abstract
The invention discloses a mouth mold structure for preparing a microchannel plastic product with high channel size controllability, which comprises a core mold, a core mold clamping plate, a mouth mold cavity outer plate, a mouth mold pressing ring and a metal micro-tube, wherein the core mold clamping plate is fixedly connected with the outer plate of the mouth mold cavity; the two finish mold cavity outer plates and the two core mold clamping plates are oppositely fixed on a finish mold clamping ring, and the finish mold clamping ring is fixedly connected with the extruder head; an inclined plane is arranged in the outer plate of the neck ring cavity, the inner parts of the two outer plates of the neck ring cavity and the two core mold clamping plates form a wedge-shaped extrusion cavity, and an extrusion opening is formed between the two outer plates of the neck ring cavity in the extrusion direction; the core die comprises an upper core die and a lower core die; the upper core die and the lower core die are both provided with a through half groove perpendicular to the extrusion direction and a plurality of ventilation half holes communicated with the through half groove along the extrusion direction, the upper core die and the lower core die are buckled together, the metal micro-tube is placed in the ventilation holes formed by the two ventilation half holes, and the other end of the metal micro-tube extends out of the core die through the through groove formed by the through half groove. The invention can improve the controllability of the channel size.
Description
Technical Field
The invention relates to the field of plastic product extrusion molding, in particular to a neck mold structure for preparing a micro-channel plastic product with high channel size controllability.
Background
The microchannel plastic product is a plastic product containing a plurality of long straight parallel microchannels, and the microchannel plastic film is widely applied to the microfluidic technical fields of micro-droplet fusion, micro-droplet preparation and the like and the immunoassay technical fields of protein chromatography, microbial detection and the like. However, in the traditional preparation process of the microchannel plastic film, the gas injection pressure of all the microchannels is the same, due to the non-Newtonian fluid characteristic in the polymer forming and processing process, the size difference among the microchannels in the prepared microchannel plastic film is large, when the microchannel plastic film is applied to droplet preparation, the controllability of the size of the prepared droplets is poor due to the difficulty in accurately regulating and controlling the size of the channels, and when the microchannel plastic film is applied to immunoassay, the stability of detection results among different channels is poor due to the poor uniformity of the size of the channels. It is desirable to provide a die structure and process that improves dimensional controllability between microchannels.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a die structure for preparing a micro-channel plastic product with high channel size controllability, which is used for preparing a micro-channel plastic product with a precisely controllable size and improves the application value of the micro-channel plastic product in microfluidic, immunodetection and other fields. The specific technical scheme is as follows:
a neck ring mold structure for preparing a micro-channel plastic product with high channel size controllability comprises a core mold, a core mold clamping plate, a neck ring mold cavity outer plate, a neck ring mold clamping ring and a metal micro-tube;
the two mouth die cavity outer plates are relatively fixed on the mouth die pressing ring, the two core die clamping plates are also relatively fixed on the mouth die pressing ring, and the mouth die pressing ring is used for being fixedly connected with the extruder head; an inclined plane is arranged in the outer plate of the mouth die cavity, so that a wedge-shaped extrusion cavity is defined by the two outer plates of the mouth die cavity and the two inner core die clamping plates, and an extrusion opening is formed between the two outer plates of the mouth die cavity in the extrusion direction;
the two ends of the core die are supported on the core die clamping plate, and the core die comprises an upper core die and a lower core die; the upper core die and the lower core die are both provided with a through half groove perpendicular to the extrusion direction and a plurality of ventilation half holes which are communicated with the through half groove along the extrusion direction, the upper core die and the lower core die are buckled together, the metal micro-pipe is placed in the ventilation holes formed by the two ventilation half holes, and the other end of the metal micro-pipe extends out of the core die through the through groove formed by the through half groove.
Furthermore, the two end faces of the upper core mold supported in the core mold clamping plate are inclined planes, the two end faces of the lower core mold supported in the core mold clamping plate are horizontal planes, and the core mold is supported in the core mold clamping plate through the horizontal planes and the inclined planes to realize supporting, limiting and sealing.
Furthermore, a metal micro-tube is placed in each vent hole.
After the die structure is fixedly connected to an extruder, each metal micro-pipe is connected with a gas injection system, and gas injection pressures applied by the metal micro-pipes are different, so that the micro-channel plastic products with different set sizes are formed.
The invention has the following beneficial effects:
compared with the traditional mouth mold structure of a microchannel plastic product, the core mold disclosed by the invention is a split type core mold consisting of an upper core mold and a lower core mold, and the split type core mold can be used for placing the metal micro-pipe in the core mold, so that separated gas injection can be realized, the gas injection pressure of each channel can be regulated and controlled, the section size of each microchannel in the extruded product can be regulated, and the controllability of the channel size is improved. In addition, the core mould is compressed and sealed by the inclination angle between the core mould and the core mould clamping plate, so that the use of high-temperature glue in the traditional processing process is avoided.
Drawings
FIG. 1 is a perspective view of a die structure of the present invention;
FIG. 2 is a cross-sectional view of the die structure of the present invention taken along the central axis;
fig. 3 is a perspective view of the core mold;
fig. 4 is a perspective view of the upper core mold;
fig. 5 is a front view of the mandrel;
FIG. 6 is a schematic view of an entire microchannel plastic article extrusion apparatus;
FIG. 7 is a diagram showing the variation of channel size with the pressure of gas injection during single-channel gas injection;
FIG. 8 is a graph of channel area versus pressure;
FIG. 9 is a cross-sectional view of a channel area varying regularly and a statistical view of the channel dimensions.
In the figure, a core die 1, a core die clamping plate 2, a die cavity outer plate 3, a die pressing ring 4, a metal micro-pipe 5, a main machine 6, a hopper 7, a machine barrel 8, a screw 9, a screw extruder head 10, an air injection system 11, a plastic melt 12, a cooling water tank 13, a roller 14, an upper core die 101, a lower core die 102, a through half groove 1011 and a ventilation half hole 1012
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
As shown in fig. 1-2, the die structure for preparing a microchannel plastic product with a high channel size controllability of the invention comprises a core die 1, two core die clamping plates 2, two die cavity outer plates 3, a die clamping ring 4 and a plurality of metal micro-tubes 5.
The two port die cavity outer plates 3 are oppositely fixed on a port die pressing ring 4, the two core die clamping plates 2 are also oppositely fixed on the port die pressing ring 4, and the port die pressing ring 4 is used for being fixedly connected with a screw extruder head 10; the outer plate 3 of the mouth die cavity is internally provided with an inclined plane, so that the two outer plates 3 of the mouth die cavity and the two core die clamping plates 2 are internally enclosed to form a wedge-shaped extrusion cavity, and an extrusion opening is formed between the two outer plates 3 of the mouth die cavity in the extrusion direction.
As shown in fig. 3 to 4, the core mold 1 is supported at both ends thereof on two core mold clamping plates 2, and the core mold 1 includes an upper core mold 101 and a lower core mold 102. The upper core die 101 and the lower core die 102 are both provided with a through half groove 1011 perpendicular to the extrusion direction and a plurality of ventilation half holes 1012 which are along the extrusion direction and communicated with the through half groove 1011, the upper core die 101 and the lower core die 102 are buckled together, the metal micropipes 5 are placed in the ventilation holes formed by the two ventilation half holes 1012, and the other ends of the metal micropipes 5 extend out of the core die 1 through the through grooves formed by the through half groove 1011, so that the metal micropipes are connected with a gas injection system. The core mould 1 is made into the split type of the upper core mould 101 and the lower core mould 102, so that the metal micro-pipes can be directly placed in the core mould, different gas injection pressures can be introduced into each metal micro-pipe, the area of the micro-channel in the final plastic product can be changed, an empirical formula of the change of the channel area along with the gas injection pressure can be determined through simulation or experiment, and the size of the micro-channel in the plastic product can be accurately controlled. Further, in order to control the size of each micro-channel of the plastic product, a metal micro-tube 5 is placed in each vent hole of the core mold.
In addition, in order to support and seal both ends of the core mold 1 and the two core mold clamping plates 2, as shown in fig. 5, both ends of the upper core mold 101 in its own length direction are inclined surfaces, both ends of the lower core mold 102 in its own length direction are flat surfaces, and the core mold 1 is supported in the holes of the core mold clamping plates 2 by the above horizontal surfaces and inclined surfaces to support, limit and seal.
Secondly, the front end and the rear end of the core mold 1 are also inclined along the extrusion direction of the plastic product, so that the core mold 1 is engaged with the wedge-shaped extrusion cavity.
As shown in FIG. 6, which is a schematic view of the application of the die structure of the present invention to the whole extrusion equipment of a microchannel plastic product, the die structure is fixed on a head 10 of a screw extruder, plastic enters a cylinder 8 through a hopper 7, and is gradually plasticized to form a plastic melt 12 under the rotating shearing action of a screw 9 and the heating action of a heating ring outside the cylinder, the melt flows between the inner wall surface of the die and the outer wall surface of a core mold, a hollow channel is formed at the position where a metal micro-tube 5 is arranged, after the melt is extruded from the die, the melt enters a cooling water tank 13 and moves forward under the traction of a roller 14, and finally, a plastic product with a plurality of straight and parallel microchannels is obtained. Suitable plastic materials include thermoplastic polymers such as Polyethylene (PE), polypropylene (PP), thermoplastic Polyurethane (TPU), and the like. And the number of microchannels can be adjusted according to the number of channels of the plastic product required.
As shown in fig. 7, in order to inject gas into a metal micro-tube, the micro-channel area of the final plastic product changes with the change of the gas injection pressure when other micro-tubes do not inject gas. When a certain channel is injected with gas, the final area of the channel increases with the increase of the gas injection pressure, whereas the final areas of the other channels do not substantially change with the change of the gas injection pressure of the channel. Therefore, an empirical formula of the change of the channel area along with the gas injection pressure can be established, and the gas injection pressure of different channels can be predicted according to the required channel area. Taking 7 channels as an example, the channels from left to right are numbered as #3, #2, #1, #0, #1, #2, # 3. Due to the structural symmetry, the sizes of the channel # 1 and the channel # 1, the channel # 2 and the channel # 2, and the channel # 3 are the same with the change rule of the gas injection pressure, so that the change rule of the sizes of the channels with the gas injection pressure can be obtained only by researching the change rule of the sizes of the channels # 0, #1, #2 and #3 with the gas injection pressure.
As shown in fig. 8, the change of the microchannel area of the plastic article with the injection pressure is shown. An empirical formula for fitting the channel area along with the change of the gas injection pressure according to the curve is as follows:
channel 0: a =78.84 (p + 0.20) 5.10 +0.04
Wherein A is the cross-sectional area of the micro-channel and the unit is mm 2 (ii) a p is the insufflation pressure in kPa.
In order to improve the size controllability among all channels and reduce the size difference among the channels, the areas of the target micro-channels are 0.06mm, 0.08 mm and 0.10mm according to an empirical formula 2 The gas injection pressures for the respective channels are shown in table 1.
TABLE 1 relationship table of gas injection pressure and target channel area for each channel
When the calculated gas injection pressure is taken as a process condition, the average areas of the channels are respectively 0.06mm, 0.078 mm and 0.095mm 2 The area of the target channel is very close to that of the target channel, and the standard deviation of the cross-sectional area of the 7 channels (the smaller the value, the higher the size uniformity) is 2.6%, 3.2% and 3.5% respectively. For the traditional gas injection mode, namely the mode that the gas injection pressure of each channel is the same, when the gas injection pressure is changed between 0 and 0.08kPa, the standard deviation of the cross section area of 7 channels is more than 6 per thousand, so that the gas is independently injected through the sub-channels, the size uniformity among the channels of the micro-channel plastic product can be improved, and the gas injection pressure in the micro-channel plastic product is improvedPrecision and stability when applied in the fields of microfluidics and immunodetection.
And (3) preparing the micro-channel plastic product with the channel size changing according to a certain rule, such as the channel size changing according to a single peak shape and a saw-tooth shape.
A single peak shape: for the preparation of #3, #2, #1, #0, #1, #2, #3, the channel areas were 0.06, 0.07, 0.08, 0.09, 0.08, 0.07, 0.06mm, respectively 2 The gas injection pressure of each channel of the microchannel plastic product is calculated according to an empirical formula to be 23, 31, 32, 36, 32, 31 and 23Pa, and finally the section of the product and the change of the channel area are obtained as shown in FIG. 9 a.
Jagged: for preparing #3, #2, #1, #0, #1, #2, #3, #0, 0.09, 0.06, 0.09, 0.06, 0.09mm channel area respectively 2 The gas injection pressure of each channel of the microchannel plastic product is calculated according to an empirical formula to be 53, 18, 41, 0, 41, 18 and 53Pa, and finally the cross section of the product and the change of the channel area are shown in FIG. 9 b.
Therefore, the mouth mold device can finally realize the accurate control of the channel size, thereby preparing the micro-channel plastic product with the channel size changing according to a certain rule. Besides by means of gas injection, controllability of the channel dimensions can also be improved by means of liquid injection, such as water or oil.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (1)
1. A mouth mold structure for preparing a micro-channel plastic product with high channel size controllability is characterized by comprising a core mold, a core mold clamping plate, a mouth mold cavity outer plate, a mouth mold pressure ring and a metal micro-tube;
the two mouth die cavity outer plates are relatively fixed on the mouth die pressing ring, the two core die clamping plates are also relatively fixed on the mouth die pressing ring, and the mouth die pressing ring is used for being fixedly connected with the extruder head; an inclined plane is arranged inside the mouth mold cavity outer plate, so that a wedge-shaped extrusion cavity is defined by the two mouth mold cavity outer plates and the two core mold clamping plates, and an extrusion opening is formed between the two mouth mold cavity outer plates in the extrusion direction;
the two ends of the core die are supported on the core die clamping plate, and the core die comprises an upper core die and a lower core die; the upper core die and the lower core die are respectively provided with a through half groove perpendicular to the extrusion direction and a plurality of ventilation half holes which are arranged along the extrusion direction and communicated with the through half grooves, the upper core die and the lower core die are buckled together, the metal micro-pipe is placed in the ventilation holes formed by the two ventilation half holes, and the other end of the metal micro-pipe extends out of the core die through the through groove formed by the through half grooves;
the upper core mold is supported in the core mold clamping plate, two end faces of the upper core mold are inclined planes, two end faces of the lower core mold are supported in the core mold clamping plate, and the core mold is supported in the core mold clamping plate through the horizontal planes and the inclined planes to realize supporting, limiting and sealing;
a metal micro-tube is placed in each vent hole;
and fixedly connecting the die structure to an extruder, connecting each metal micro-tube with a gas injection system, and forming micro-channel plastic products with different set sizes by applying different gas injection pressures on each metal micro-tube.
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| CN202110743399.2A CN113263708B (en) | 2021-07-01 | 2021-07-01 | Die structure for preparing micro-channel plastic product with high channel size controllability |
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