CN103029263B - Adapted to injection system and injection moulding process, automobile glass encapsulation, vehicle window - Google Patents

Abstract

The invention provides an injection molding system and an injection molding method, an automobile glass edge wrapping, and a vehicle window. The injection molding system includes: a gas supply device connected to the plasticizing device for supplying at least one gas to the plasticizing device; the plasticizing device is used to plasticize the raw materials to form a solution, and is also used to mix the gas with the solution, A mixed solution containing air bubbles is formed; the injection device is connected with the plasticizing device and is used for injecting the mixed solution containing air bubbles into the cavity of the automobile glass edge wrapping mold. The injection molding method includes: plasticizing the raw material to form a solution; injecting at least one gas into the raw material during the plasticizing process; mixing the solution and the gas to form a mixed solution containing bubbles; injecting the mixed solution into the In the cavity of the automobile glass encapsulation mold to form the automobile glass encapsulation. The invention also provides an automobile glass encapsulation formed by the injection molding method and a vehicle window including the automobile glass encapsulation. The present invention suppresses shrinkage problems in injection molding.

Description

Injection molding system and injection molding method, automotive glass edge wrapping, window

technical field

The invention relates to the field of glass technology, in particular to an injection molding system and an injection molding method for forming an automobile glass encapsulation, an automobile glass encapsulation formed by the injection molding method, and a vehicle window including the automobile glass encapsulation.

Background technique

Glass edging can increase the airtightness, noise reduction and safety of the glass, and can also make the glass more beautiful.

In the Chinese patent application whose publication number is CN102180081A, an automobile rear quarter window assembly is disclosed. Referring to FIG. 1 , it shows a schematic diagram of the rear quarter window assembly of the automobile in the said Chinese patent application. The automobile rear quarter window assembly includes: a glass 11 and a glass encapsulation 12 formed around the glass 11 . The glass edge 12 includes a glue-applied surface 121 , a lip 122 and a glue-holding groove 123 . The glue-holding groove 123 is formed on the glue-applying surface 121 for coating glass glue, and the sol groove 121 can block the lateral flow of glass glue, thereby preventing glue leakage. The lip 122 is in a sheet shape and can be compressed and deformed. The glass edge 12 is formed by injection molding process.

The injection molding process includes: plasticizing the raw materials to form a solution, and then injecting the solution into the mold cavity, and the solution is cooled and solidified in the mold cavity to form an injection molded part that matches the shape of the mold cavity .

However, when the injection molding process of the prior art forms glass edging, the solution shrinks in the mold cavity due to cooling, which makes the size of the glass edging formed by injection molding less than the design specification, so that the glass edging is different from other parts of the automobile window. Fittings don't make a good match. For example: in the assembly process of automobile windows, it is easy to appear "cracks" caused by the size mismatch between the glass edge and the bright trim.

In order to prevent the occurrence of the shrinkage problem, the prior art adopts a technical solution of increasing the injection pressure. However, the increase of the injection pressure is likely to cause glass breakage, which leads to a decrease in the manufacturing yield of the glass edge.

Contents of the invention

Therefore, there is a need for an injection molding system that can suppress the natural shrinkage caused by cooling during injection molding.

According to one aspect of the present invention, an injection molding system is provided, comprising: a gas supply device, a plasticizing device, an injection device and an automobile glass edge encapsulation mold; the gas supply device is connected with the plasticizing device for feeding The plasticizing device provides at least one gas; the plasticizing device is used to plasticize raw materials to form a solution, and is also used to mix the gas with the solution to form a mixed solution containing air bubbles; the The injection device is connected with the plasticizing device, and is used for injecting the mixed solution containing air bubbles into the cavity of the automobile glass edge wrapping mold.

A basic idea is to provide a gas supply device connected to the plasticizing device, supply at least one gas to the plasticizing device, and form a mixed solution containing air bubbles in the plasticizing device, so that the injection device will contain When the mixed solution of the bubbles is injected into the cavity of the automotive glass edge-encapsulation mold, the bubbles begin to expand due to changes in air pressure, and the expansion of the bubbles and the shrinkage of the mixed solution cancel each other out, thereby suppressing the shrinkage problem.

In one example, the injection molding system is further provided with an exhaust device, which is used to exhaust the cavity of the automobile glass edge encapsulation mold during the process of injecting the mixed solution. By setting the exhaust device in the injection molding system, the cavity of the automobile glass edging mold can be exhausted during the process of injecting the mixed solution, so as to improve the smoothness of the surface of the automobile glass edging.

According to another aspect of the present invention, there is provided an injection molding method, comprising: plasticizing the raw material to form a solution; passing at least one gas into the raw material during the process of plasticizing the raw material; mixing the solution with the gas Together, a mixed solution containing air bubbles is formed; the mixed solution containing air bubbles is injected into the cavity of the automobile glass edge wrapping mold to form the automobile glass edge wrap.

A basic idea is to mix gas into the raw material during the plasticizing process to form a mixed solution containing air bubbles, so that when the mixed solution containing air bubbles is injected into the mold cavity, the air bubbles start to expand due to changes in air pressure , the expansion of the bubbles and the contraction of the mixed solution cancel each other out, thereby suppressing the shrinkage problem.

In one example, the step of injecting the mixed solution into the cavity of the automotive glass hemming mold further includes: exhausting the cavity of the automotive glass hemming mold during the injection of the mixed solution, by Injecting and exhausting the cavity of the automotive glass edging mold during the injection process can remove the air bubbles on the surface of the automotive glass edging, thereby improving the smoothness of the surface of the automotive glass edging.

According to another aspect of the present invention, an automobile glass encapsulation is provided, and the interior of the automobile glass encapsulation has micropores.

A basic idea is that the micropores have the effect of preventing the deformation of the automobile glass encapsulation, thereby improving the yield rate of the automobile glass encapsulation, and the existence of the micropores also reduces the weight of the automobile glass encapsulation, reducing The cost of said automobile glass wrapping is reduced.

According to another aspect of the present invention, there is also provided a vehicle window including the encapsulation of the vehicle glass.

A basic idea is that the micropores can prevent deformation of the wrapping of the automobile glass, thereby improving the yield rate of the vehicle window, and the existence of the micropores can also reduce the weight of the vehicle window and reduce the cost of the vehicle window.

Description of drawings

Fig. 1 is a schematic diagram of a prior art automobile rear triangle window assembly;

Fig. 2 is the schematic diagram of an embodiment of the injection molding system of the present invention;

Fig. 3 is a schematic flow diagram of an embodiment of the injection molding method of the present invention;

Fig. 4 is a schematic front view of an embodiment of the vehicle window of the present invention;

Fig. 5 is a schematic view of the rear of the window shown in Fig. 4 .

detailed description

The invention provides an injection molding system and an injection molding method for forming automotive glass edging. In the process of plasticizing the raw materials, gas is mixed into the raw materials to form a mixed solution containing air bubbles. In this way, the mixed solution containing air bubbles is injected When entering the mold cavity, the air bubbles begin to expand due to changes in air pressure, and the expansion of the bubbles and the shrinkage of the mixed solution cancel each other out, thereby suppressing the shrinkage problem. Edged windows meet design specifications and have high production yields.

Further description will be given below in conjunction with specific examples.

Referring to FIG. 2 , a schematic view of an embodiment of the injection molding system of the present invention is shown. The injection molding system includes: a gas supply device 100 , a plasticizing device 200 , an injection device 300 and an automobile glass encapsulation mold 400 . in,

The gas supply device 100 is connected to the plasticizing device 200 and used for supplying at least one gas to the plasticizing device 200 . Specifically, the gas supply device 100 includes a gas cylinder 101 , a processing unit 102 and a control unit 103 .

The gas cylinder 101 is used for storing gas. In this embodiment, the gas cylinder 101 is a gas cylinder that stores nitrogen, and the nitrogen will not cause environmental pollution, which meets the low-carbon requirements. In other embodiments, the injection molding system may also use one gas in carbon dioxide, inert gas, compressed air or a mixture of multiple gases, which is not limited in the present invention.

The processing unit 102 is connected with the gas cylinder 101 and used for adjusting the air pressure of the gas cylinder 101 to the plasticizing device 200 . Specifically, the processing unit 102 may be an air valve.

The control unit 103 is connected with the processing unit 102 and is used to control the time of gas supply. The time here includes the start time of the air supply as well as the duration of the air supply. Under the control of the control unit 103 , the control unit 103 is configured to start supplying gas after adding raw materials into the plasticizing device 200 , thereby controlling the timing of feeding gas into the plasticizing device 200 . The gas supply device 100 controls the total amount of gas passed into the plasticizing device 200 by controlling the duration of the gas supply, thereby controlling the size of the bubbles in the mixed solution.

Specifically, the control unit 103 may include an electromagnetic switch connected to the processing unit 102, and a clock unit for controlling the electromagnetic switch to be turned on or off. When the electromagnetic switch is in the on state, it can provide the gas whose pressure is adjusted by the processing unit 102 , and when the electromagnetic switch is in the off state, the gas supply is stopped. The clock unit may be a virtual unit implemented by a computer program, or a circuit unit capable of providing a clock signal. The rising edge of the clock signal can trigger the open state of the electromagnetic switch, or the falling edge of the clock signal can trigger the closed state of the electromagnetic switch, so as to realize the control of the start time of the gas supply; The duration of the high level of the clock signal is used to control the duration of the electromagnetic switch being in the open state, thereby realizing the control of the duration of the air supply.

It should be noted that the more gas mixed in the solution formed by plasticized raw materials, the larger the bubbles in the final mixed solution; the less gas mixed in the solution formed by plasticized raw materials, the smaller the bubbles in the final mixed solution . That is to say, under the condition that the gas flow rate is constant, the longer the duration of the gas supply under the control of the control unit 103, the larger the bubbles (correspondingly, the larger the micropores in the finally formed automotive glass encapsulation); The shorter the duration of the air supply, the smaller the air bubbles (and correspondingly smaller pores in the resulting automotive glass encapsulation).

It should be noted that the gas supply device 100 is not limited to the manner shown in FIG. 2 , and may also include a compressor and a controller, the compressor is used to provide compressed air with a certain pressure; the controller is connected to the compressor, Used to control the start time and duration of the compressed air supply. In this way, the gas supply device 100 can provide compressed air to the plasticizing device 200, and the compressed air is a relatively cheap gas, which can reduce the cost.

The plasticizing device 200 is used to plasticize the raw materials to form a solution, and is also used to mix the gas with the solution to form a mixed solution containing air bubbles. In this embodiment, the plasticizing device 200 includes: a plasticizing barrel 201 , a barrel 202 and a heating unit 203 .

The plasticizing barrel 201 is used for feeding raw materials. In this embodiment, the raw material may be particles of polyvinylchloride (polyvinylchloride, PVC) or thermoplastic elastomer (Thermoplastic Elastomer, TPE) material. In other embodiments, other raw materials may also be used.

The barrel 202 is provided with an air inlet communicating with the gas supply device 100 and a material inlet communicating with the plasticizing cylinder 201 . The barrel 202 has a hollow cavity, the gas provided by the gas supply device 100 enters the cavity through the air inlet, and the raw materials injected from the plasticizing barrel 201 enter the cavity through the inlet . It should be noted that a one-way valve can be set at the air inlet and the feed port, so that the gas and raw materials enter the barrel 202 and are sealed in the barrel 202 by the one-way valve. , thereby improving the sealing effect of gas and raw materials in the barrel 202. After being sealed in the barrel 202, the gas and raw materials are mixed and plasticized in the barrel 202.

The heating unit 203 is used to heat the raw material in the barrel 202, so that the raw material can be plasticized. During plasticization, when the granular raw material is heated to the molding temperature, a fluid solution can be formed. It should be noted that for the granular raw materials, the molding temperature is usually relatively high when the gas is not fed, but after the gas is fed, a mixed solution containing bubbles can be formed. Due to the existence of the bubbles, the temperature of the mixed solution is improved. Fluidity, thus reducing the molding temperature during plasticization. Specifically, the raw material in this embodiment is PVC or TPE granules, and the heating step keeps the temperature in the range of 100-200° C. (lower than the temperature when no gas is introduced). This can reduce the time spent on the heating process, shorten the injection molding cycle, and improve production efficiency.

The heating unit 203 can be realized by means of resistance wire heating, and the heating principle and structure are the same as those of the prior art, and will not be repeated here.

It should be noted that the plasticizing device 200 is not limited to the manner shown in FIG. 2 , and the plasticizing device 200 may also be a piston-type structure, specifically including: a cylinder and a piston arranged in the cylinder, and the piston may The raw material is pushed to the inside of the cylinder, and the wall of the cylinder is provided with an air inlet for introducing gas. The outer wall of the cylinder is provided with a heating unit, and the heating of the heating unit can realize the plasticization of the raw materials in the cylinder.

The injection device 300 is connected with the plasticizing device 200 and is used for injecting the mixed solution containing air bubbles into the cavity of the automobile glass edge encapsulation mold 400 . Specifically, the injection device 300 includes a screw 301 , a motor (not shown in the figure) and a discharge port 302 . The motor and the outlet 302 are respectively located at two ends of the screw 301 .

The discharge port 302 communicates with the cavity of the automobile glass hemming mold 400 .

The screw 301 is sleeved in the barrel 202, and driven by the motor, the screw 301 rotates toward the discharge port 302, so that the mixed solution in the barrel 202 is discharged from the discharge port with injection pressure. The mouth 302 injects into the cavity of the automobile glass edge wrapping mold 400 . Specifically, the inner wall of the cavity of the barrel 202 is provided with a first thread, and the wall of the screw 301 is provided with a second thread matching the first thread. Pushing the screw 301 can make the mixed solution in the cavity of the barrel 202 be discharged from the outlet 302 and filled into the cavity of the automobile glass hemming mold 400 . Here, the force for moving the screw 301 in the barrel 202 is the injection pressure.

In addition, the screw 301 can rotate under the drive of the motor, which can make the raw material and gas mix evenly between the screw 301 and the inner wall of the barrel 202, and can also accelerate the process of plasticizing the raw material. In this embodiment, the screw 301 can rotate along the axis OO'.

It should be noted that the injection device 300 is not limited to the manner shown in FIG. 2 , and can also be other devices that can inject the mixed solution into the cavity of the automobile glass hemming mold 400. The specific details of the injection device 300 in the present invention The structure is not limited.

The mold cavity of the automobile glass encapsulation mold 400 is matched with the automobile glass encapsulation to be formed. After the mixed solution containing air bubbles is injected into the mold cavity, the mixed solution is cooled to become highly elastic, and then further cooled and solidified to form an automotive glass encapsulation. During this process, on the one hand, a phenomenon of natural shrinkage will occur due to the drop of the external temperature; ), the bubbles start to expand due to the pressure difference. The expansion of the bubbles and the shrinkage of the mixed solution cancel each other out, thereby suppressing the shrinkage of the automotive glass wrapping.

It should be noted that in the injection process of the prior art, in addition to applying injection pressure to the screw 301 to push the screw 301; a holding pressure is also applied to fill the gap between the cavity and the mixed solution caused by shrinkage. void. Since this embodiment suppresses the shrinkage problem, the holding pressure can no longer be applied or only a small holding pressure can be applied, thereby preventing glass breakage caused by excessive holding pressure and improving the yield.

In addition, the mixed solution in this embodiment contains air bubbles and has good fluidity. Therefore, compared with the prior art, the injection pressure in this embodiment is relatively small, and the problem of glass breakage can also be prevented. In addition, the mixed solution with better fluidity has a better filling effect on the automotive glass edging mold 400 , so it can be used to form an automotive glass edging with a relatively complex structure.

Furthermore, there are micropores in the final automotive glass wrapping, which can also save raw materials and reduce product weight.

In another embodiment of the injection molding system of the present invention, an exhaust device is also provided in the injection system for exhausting the cavity of the automobile glass edge encapsulation mold during the process of injecting the mixed solution.

Specifically, the exhaust device may be at least one exhaust hole provided in the automobile glass hemming mold. By setting the pore size of the exhaust hole, it can be ensured that the gas is discharged while the mixed solution is not discharged. Preferably, when the number of vent holes is multiple, the vent holes can be evenly arranged on the automobile glass edging mold to realize uniform exhaust, and then ensure the smoothness of the surface of the large-area automobile glass edging, so in addition to The advantages of the foregoing embodiments can be achieved, and the injection molding system provided with the exhaust device in this embodiment can also prevent bubbles from forming on the surface of the glass edge.

The exhaust device may also be at least one exhaust box needle arranged in the automobile glass hemming mold. The gas on the surface of the car glass edge can be sucked out through the exhaust box needle. Preferably, for the sake of aesthetics, the vent box needle is arranged at a position corresponding to the back side of the automobile glass hemming mold in the automobile glass hemming mold. Here, the back side of the automobile glass encapsulation refers to the side of the automobile glass encapsulation facing the automobile body during installation.

The exhaust device can also be a vacuum device connected with the automobile glass edging mold, and the vacuum device can extract the gas in the automobile glass edging. Although the price of the vacuum device is relatively high, it has a good performance. Controllability can guarantee the exhaust effect.

The present invention also provides an injection molding method. Referring to FIG. 3 , it shows a schematic flow chart of an embodiment of the injection molding method of the present invention. Described injection molding method roughly comprises the following steps:

Step S1, plasticizing the raw materials to form a solution;

Step S2, injecting at least one gas into the raw material during the process of plasticizing the raw material;

Step S3, mixing the solution and the gas together to form a mixed solution containing air bubbles;

Step S4, injecting the mixed solution containing air bubbles into the cavity of the automobile glass hemming mold to form the automobile glass hemming.

The technical solution of the injection molding method of the present invention will be described in detail below with reference to the injection molding system shown in FIG. 2 .

Execute step S1 , put PVC or TPE particles into the plasticizing barrel 201 , and enter into the cavity of the barrel 202 through the feeding port of the barrel 202 . After the raw materials are put in, the raw materials in the barrel 202 are heated by the heating device 203 to form a solution.

Execute step S2 , under the control of the control unit 103 in the gas supply device 100 , inject at least one gas into the cavity of the barrel 202 through the air inlet of the barrel 202 . In this embodiment, the gas may be nitrogen. In other embodiments, the gas may also be carbon dioxide or a mixed gas of nitrogen and carbon dioxide.

It should be noted that the more gas mixed in the solution, the larger the bubbles will be, and finally the larger micropores will be formed in the automotive glass edging; The smaller the micropores formed in the Therefore, in practical applications, the size of bubbles and micropores can be adjusted by adjusting the gas flow rate and the duration of gas supply.

After step S3 is executed, the gas and raw materials can be sealed in the barrel 202 after entering the barrel 202 through a one-way valve that only enters and exits, thereby improving the sealing effect of the barrel 202 . The screw 301 sleeved in the barrel 202 is driven by the motor to rotate along the axis OO', so that the solution and the gas located between the screw 301 and the wall of the barrel 202 are uniformly mixed together , forming a mixed solution containing air bubbles.

It should be noted that the process of plasticizing the raw material, introducing gas and rotating to achieve mixing can be carried out simultaneously.

After feeding the gas, a mixed solution containing air bubbles is formed. Due to the existence of air bubbles, the fluidity of the mixed solution is improved, thereby reducing the molding temperature in the plasticizing process. In this embodiment, the raw material is PVC or TPE. In the step of heating, the temperature is in the range of 100-200°C.

Execute step S4, use the injection pressure to make the screw 301 inject the mixed solution into the cavity of the automobile glass hemming mold 400, after the mixed solution containing air bubbles is injected into the cavity, the mixed solution is cooled to form a high elastic state, It is then further cooled and solidified to form an automotive glass encapsulation. Since the expansion of the bubbles and the shrinkage of the mixed solution cancel each other out, the shrinkage of the automotive glass wrapping is suppressed.

It should be noted that after the mixed solution is injected into the cavity, if the temperature in the cavity is too high, it is not conducive to the curing process; if the temperature in the cavity is too low, the curing process will be too fast, and the expansion of the bubbles will not be effective in offsetting the shrinkage. Therefore, preferably, the temperature of the mixed solution after it is injected into the cavity is in the range of 30-50°C.

It should also be noted that after the cavity is filled, a smaller holding pressure can also be applied on the screw 301 compared with the prior art without gas, so as to maintain the injection state, so that the newly injected mixed solution can be filled The gap between the cavity and the mixed solution caused by shrinkage. It should be noted that since the present invention suppresses the problem of shrinkage, the holding pressure can no longer be applied, but only the injection pressure can be applied during injection, thereby simplifying the steps, reducing the injection molding cycle, and improving the Productivity.

Correspondingly, the present invention also provides an automobile glass encapsulation, a vehicle window comprising the automobile glass encapsulation. Referring to Fig. 4 and Fig. 5, the front schematic view and the rear schematic view of an embodiment of the vehicle window of the present invention are shown respectively. This embodiment takes a triangular vehicle window as an example, but the present invention is not limited thereto.

The vehicle window includes: a triangular glass 500 and an automotive glass encapsulation 501 located around the triangular glass 500 .

The interior of the automobile glass encapsulation 501 in the vehicle window of the present invention includes a plurality of micropores. The micropores have the effect of preventing the deformation of the automobile glass edging, which improves the yield of the automobile glass edging; in addition, the existence of the micropores can also reduce the weight of the automobile glass edging; furthermore, the existence of the micropores can also The material used to form the car glass edge can be saved to reduce the cost.

If the size of the micropores is too large, it is easy to penetrate through the automobile glass wrapping 501 to form open air bubbles; if the size of the micropores is too small, the effect of inhibiting shrinkage is relatively small. Therefore, preferably, the diameter of the micropores inside the automotive glass encapsulation 501 is in the range of 0.01-1 mm.

It should be noted that the automobile glass encapsulation 501 here can be formed by the injection molding method of the present invention, or can be formed by other methods, and the present invention is not limited thereto.

In addition, the micropores can reduce the weight of the automobile glass encapsulation 501 and the vehicle window.

An assembly part 502 is also provided on the back of the vehicle window, and the assembly part 502 is used to realize the assembly of the vehicle window and the vehicle body (not shown in the figure).

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the methods disclosed above and technical content to analyze the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made in the technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention, which do not depart from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.

Claims (18)

1. An injection molding system, comprising: the device comprises a gas supply device, a plasticizing device, an injection device and an automobile glass edge-wrapping mold; wherein,

the gas supply device is connected with the plasticizing device and is used for supplying at least one gas to the plasticizing device;

the plasticizing device is used for plasticizing the raw material to form a solution and mixing the gas and the solution to form a mixed solution containing bubbles;

the injection device is connected with the plasticizing device and is used for injecting the mixed solution containing the air bubbles into a cavity of the automobile glass edge-wrapping die;

and the exhaust device is used for exhausting the cavity of the automobile glass edge-wrapping mold in the process of injecting the mixed solution.

2. The injection molding system of claim 1, wherein the venting means is at least one vent hole disposed in the automotive glass-hemming mold.

3. The injection molding system of claim 1, wherein the exhaust device is at least one exhaust box pin disposed in the automotive glass-hemming mold.

4. The injection molding system of claim 3, wherein the venting box pin is disposed at a location of the automotive glass-hemming mold corresponding to a back side of an automotive glass-hemming mold.

5. The injection molding system of claim 1, wherein the exhaust is a vacuum extractor associated with the automotive glass-hemming mold.

6. The injection molding system of claim 1, wherein the gas supply device comprises:

a gas cylinder for storing gas;

the processing unit is connected with the gas cylinder and used for adjusting the gas pressure of the gas supplied by the gas cylinder;

and the control unit is connected with the processing unit and used for controlling the air supply time.

7. The injection molding system of claim 1, wherein the plasticizing device comprises:

the plasticizing charging barrel is used for feeding raw materials;

the cylinder is provided with a gas inlet communicated with the gas supply device and a feed inlet communicated with the plasticizing cylinder;

a heating unit for heating the barrel.

8. An injection molding system as claimed in claim 1, wherein said gas is one or more of nitrogen, carbon dioxide, an inert gas, compressed air.

9. The injection molding system of claim 1, wherein the injection device comprises:

the discharge hole is communicated with a cavity of the automobile glass edge-wrapping die;

the screw rod and the motor are driven by the motor to rotate towards the discharge port, and the screw rod is used for discharging the mixed solution in the plasticizing device from the discharge port and filling the mixed solution into a cavity of the automobile glass edge-wrapping die.

10. An injection molding method, comprising:

plasticizing the feedstock to form a solution;

introducing at least one gas in the process of plasticizing the raw material;

mixing the solution and the gas together to form a mixed solution containing bubbles;

injecting the mixed solution containing the air bubbles into a cavity of an automobile glass edge-wrapping mold to form an automobile glass edge;

and exhausting the cavity of the automobile glass edge-wrapping mold in the process of injecting the mixed solution.

11. An injection molding method according to claim 10, wherein the step of injecting the mixed solution into a cavity of an automotive glass-hemming mold comprises:

injecting the mixed solution into a cavity of the automobile glass edge-wrapping mold at injection pressure;

the injection state is maintained at the holding pressure.

12. An injection molding method according to claim 10, wherein the step of injecting the mixed solution into a cavity of an automotive glass-hemming mold comprises:

and injecting the mixed solution into a cavity of the automobile glass edge-wrapping mold at injection pressure.

13. An injection molding method as claimed in claim 10, wherein said step of plasticizing the feedstock comprises:

heating the feedstock.

14. An injection molding method as claimed in claim 13, wherein the material is PVC or TPE and the heating step is performed to a temperature in the range of 100-200 ℃.

15. An injection molding method according to claim 10, wherein in the step of injecting the mixed solution into the cavity of the automotive glass-hemming mold, the temperature of the mixed solution is in a range of 30 to 50 ℃.

16. An automotive glass-flange formed by the injection molding method of any one of claims 10 to 15.

17. The automotive glass-hemming of claim 16 wherein the automotive glass-hemming has micro-holes therein, the micro-holes having a diameter in the range of 0.01 to 1 mm.

18. A vehicle glazing comprising an automotive glazing bead as claimed in claim 16 or 17.