CN210121947U - Mould with movable cavity - Google Patents

Abstract

The utility model provides a mould with activity die cavity, it is including removing mould and fixed mould, it is equipped with and removes mould strutting arrangement to remove the mould, the fixed mould is equipped with fixed mould strutting arrangement, remove the mould with the fixed mould is mutually supported, it is equipped with and removes the mould core to remove the mould, be equipped with the fixed mould on the fixed mould, its characterized in that still includes direction subassembly, water course device and location structure, it includes second moving mechanism and stop device to remove the mould, second moving mechanism passes through direction subassembly stop device with remove mould swing joint. The utility model discloses a mould with activity die cavity is owing to be equipped with movable die cavity, can adjust the size of activity die cavity according to the demand of product, makes the volume that the activity die cavity stops before the compression be greater than the product, and liquid raw materials flows easily in great volumetric activity die cavity, and the product is easy shaping under low-speed or low pressure, and product internal stress is good in addition, the outward appearance is beautiful, thickness is even, combined material is difficult for the alternate segregation.

Description

A mold with movable cavity

technical field

The utility model relates to a mold, in particular to a mold with a movable cavity.

Background technique

Injection mold is a tool for producing plastic products, and it is also a tool for giving plastic products complete structure and precise dimensions. Injection molding is a processing method used in the mass production of some complex-shaped parts. Specifically, it refers to the injection of the heated and melted plastic into the cavity of the injection molding machine at high pressure, and after cooling and solidification, a molded product is obtained.

The injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. Both the movable mold and the fixed mold form a fixed cavity. The size cannot be changed. During injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product. In order to reduce the heavy workload of mold design and manufacturing, most of the injection molds use standard mold bases.

At present, the molds for product molding in the mold industry all use glue injection into a fixed cavity. The volume of the fixed cavity is the same as the volume of the product. During the molding process, the fixed cavity is too small, which leads to the flow of raw materials. The resistance is large and it is not easy to form. In order to achieve product forming, the injection pressure and injection speed must be increased, which leads to large internal stress of the formed product, poor appearance, uneven thickness, and easy separation of composite materials, resulting in poor product quality. , Low yield.

Utility model content

Based on the deficiencies of the prior art, the purpose of the present invention is to provide a mold with a movable cavity, because the movable cavity is used, and the size of the movable cavity can be adjusted according to the specifications and sizes of the required molded products. , Before or during injection, the volume of the movable cavity can be larger than the volume of the molded product, so the resistance of the raw material to flow in the movable cavity will become smaller, so that the raw material can easily flow in the movable cavity, so as to realize The product is easy to form, resulting in good internal stress, beautiful appearance, uniform thickness, and difficult separation of composite materials.

In order to achieve the above purpose, the present invention provides a mold with a movable cavity, which includes a movable mold and a fixed mold, the movable mold is provided with a movable mold support device, and the fixed mold is provided with a fixed mold support device, so The movable mold and the fixed mold cooperate with each other, the movable mold is provided with a movable mold core, and the fixed mold is provided with a fixed mold core, characterized in that it also includes a guide assembly, a water channel device and a positioning structure, so The moving mold includes a second moving mechanism and a limiting device, the second moving mechanism is movably connected with the moving mold through the guide assembly and the limiting device, and the mold core of the moving mold passes through the The positioning structure is positioned on the support device of the moving mold, the mold core of the fixed mold is positioned on the support device of the fixed mold through the positioning structure, and the water channel device is distributed on the moving mold inside and inside the stationary mold.

As an improvement of the mold with movable cavity of the present invention, the mold with movable cavity of the present invention further includes an exhaust device, and the second moving mechanism includes a moving bearing device, an insert combination and a connecting piece. The component combination is fixed on the moving carrying device through the connecting piece, the insert combination, the movable mold core and the fixed mold core form a movable cavity, and the exhaust device is arranged on the movable mold core. Around the cavity, the insert assembly is directly or indirectly positioned on the support device of the moving die through the positioning structure.

As an improvement of the mold with movable cavity of the present invention, the exhaust device of the mold with movable cavity of the present invention includes an air slot, an exhaust gap and an exhaust channel, and the exhaust gap is connected to the air slot. There are two or more of the exhaust gaps, and the size of each of the exhaust gaps is set according to the position of the mold where the exhaust gap is located.

As an improvement of the mold with movable cavity of the present invention, the size of the exhaust gap of the mold with movable cavity of the present invention is from the nearest end of the feed port of the mold to the farthest end of the feed port of the mold. The variation or the size of the vent gap varies sequentially from the position where the mold is the easiest to mold to the position where the mold is the most difficult.

As the improvement of the mold with movable cavity of the present invention, the positioning structure of the mold with movable cavity of the present invention includes a nozzle insert, a feed port insert and a positioning pin, and the nozzle insert is positioned by positioning The pin is installed at the center position of the fixed mold, and the feed port insert is installed at the center position of the movable mold through the positioning pin.

As an improvement of the mold with movable cavity of the present invention, the movable cavity of the mold with movable cavity of the present invention is one or more than one.

As an improvement of the mold with movable cavity of the present invention, the size of the exhaust gap of the mold with movable cavity of the present invention is L, 0.005mm≤L≤0.05mm.

Compared with the prior art, the mold with movable cavity has the following beneficial effects: due to the movable cavity, the size of the movable cavity can be adjusted according to the requirements of the product, so that the movable cavity stops the volume before compression. Larger than the volume of the product, the resistance of the liquid raw material to flow in the larger-volume movable cavity will become smaller, the liquid raw material will flow easily, the product will be easy to form at low speed or low pressure, and the product has good internal stress, beautiful appearance, uniform thickness and composite Materials are not easily separated from each other.

Description of drawings

FIG. 1 is a schematic diagram of the first step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

2 is a schematic diagram of the second step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

3 is a schematic diagram of the third step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

4 is a schematic diagram of the fourth step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

5 is a schematic diagram of the sixth step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

6 is a schematic diagram of the sixth step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

7 is a schematic diagram of the seventh step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

8 is a schematic diagram of the eighth step of the working process of the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

FIG. 9 is a schematic structural diagram of the movable mold of the preferred embodiment of the mold with movable cavity of the present invention.

10 is a schematic structural diagram of a fixed mold of a preferred embodiment of the mold with movable cavity of the present invention.

11 is a top view of the appearance of the product light guide plate blank produced by the mold with movable cavity in the preferred embodiment of the mold with movable cavity of the present invention.

FIG. 12 is a top view of the appearance of a product mobile phone back cover blank produced by the mold with a movable cavity in the preferred embodiment of the mold with a movable cavity of the present invention.

13 is a schematic view of the A-A cross-sectional structure of the movable mold of the preferred embodiment of the mold with movable cavity of the present invention.

14 is a schematic view of the C-C cross-sectional structure of the fixed mold of the preferred embodiment of the mold with movable cavity of the present invention.

15 is a partial enlarged view of the M part in the A-A cross-sectional structural schematic diagram of the movable mold of the preferred embodiment of the mold with movable cavity of the present invention.

16 is a schematic cross-sectional structural diagram of a preferred embodiment of a mold with a movable cavity of the present invention after the movable mold and the fixed mold are clamped.

17 is a partial enlarged view of the K part in the schematic cross-sectional structure diagram of the movable mold and the fixed mold of the preferred embodiment of the mold with movable cavity of the present invention.

Detailed ways

The mold with movable cavity of the utility model is suitable for producing thin-walled products, battery back covers, mobile phone cases or optical products. of composite materials.

Refer to Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17. Describe in detail the preferred embodiment and other embodiments of the mold with movable cavity of the present invention.

The utility model provides a mold with a movable cavity, which comprises a movable mold 1 and a fixed mold 2, the movable mold 1 is provided with a movable mold support device 1.10, and the fixed mold 2 is provided with a fixed mold support device 2.4, so The movable mold 1 and the fixed mold 2 cooperate with each other, the movable mold 1 is provided with a movable mold core 1.12, and the fixed mold 2 is provided with a fixed mold core 2.1, which is characterized in that it also includes a guide assembly 3, Water channel device 5 and positioning structure 6, the moving mold 1 includes a second moving mechanism 1.1 and a limiting device 1.2, the second moving mechanism 1.1 passes through the guide assembly 3, the limiting device 1.2 and the The movable mold 1 is movably connected, the mold core 1.12 of the movable mold 1 is positioned on the support device 1.10 of the movable mold 1 through the positioning structure 6, and the mold core 2.1 of the fixed mold 2 passes through the positioning structure 6 is positioned on said support means 2.4 of said stationary mould 2, said waterway means 5 are distributed in said moving mould 1 and in said stationary mould 2.

In this embodiment, the mold with movable cavity of the present invention further includes an exhaust device 8, and the second moving mechanism 1.1 includes a moving carrying device 1.1.1, an insert combination 1.1.2 and a connecting piece 1.1.3 , the insert combination 1.1.2 is fixed on the moving carrying device 1.1.1 through the connecting piece 1.1.3, the insert combination 1.1.1, the moving mold core 1.12 and the fixed mold The mold core 2.1 forms a movable cavity, the exhaust device 8 is arranged around the movable cavity, and the insert assembly 1.1.2 is directly or indirectly positioned on the movable mold 1 through the positioning structure 6 On the support device 1.10.

In this embodiment, the exhaust device 8 of the mold with movable cavity of the present invention includes an air groove 8.1 and an exhaust gap 8.2, the exhaust gap 8.2 communicates with the air groove 8.1, and the exhaust air There are two or more gaps 8.2, and the size of each exhaust gap 8.2 is set according to the different positions of the mold where the exhaust gap 8.2 is located.

In this embodiment, the size of the exhaust gap 8.2 of the mold with the movable cavity of the present invention varies sequentially from the closest end to the feed port of the mold to the most distal end to the feed port of the mold or the exhaust The size of the gap 8.2 varies sequentially from the position where the mold is the easiest to mold to the position where the mold is the most difficult.

In this embodiment, the positioning structure 6 of the mold with movable cavity of the present invention includes a nozzle insert 6.1, a feed port insert 6.2 and a positioning pin 6.3, and the nozzle insert 6.2 passes through the positioning pin 6.3. Installed at the center position of the fixed mold 2, the feed port insert 6.2 is installed at the center position of the movable mold 1 through a positioning pin 6.3.

In this embodiment, there are two movable cavities of the mold with movable cavities of the present invention.

In this embodiment, the size of the exhaust gap 8.2 of the mold with the movable cavity of the present invention is L, and L=0.025mm.

The working process of the mold with the movable cavity to produce the light guide plate blank of the thin-walled product is as follows:

The thickness of the light guide plate blank is 0.4mm, the length is 152mm, and the width is 70mm. The raw material is PC-1501. The model of the injection molding machine is Sumitomo LGP180, and the screw diameter is 25mm.

The existing light guide plate blanks are formed by direct injection of ordinary molds, and the size of the mold cavity cannot be changed. After injecting directly into the fixed cavity, the plunger or reciprocating screw is injected into the cavity of the closed mold. Methods of processing plastics to form articles.

Ordinary molds directly inject light guide plate blanks for ultra-thin products. Although the injected liquid material has good fluidity, due to the low volume and ultra-thin molding cavity of the light guide plate blanks for ultra-thin products, the injection must be carried out at a high pressure. The pressure is 2800kgf/cm ² . The high pressure causes the formed light guide plate blank to have large internal stress, poor appearance, and uneven thickness at the proximal and distal ends of the feed port.

In this embodiment, the size of the mold cavity of the mold with movable cavity of the present invention can be changed, so that the volume of the movable cavity before or during injection is larger than the volume of the product, so it can be compared at a higher speed. The low pressure is used to inject liquid raw materials with good fluidity. The high feeding speed is 1000mm/s, and the low injection pressure is 1800kgf/cm. The proximal and distal ends of the mouth are uniform in thickness.

First, the PC raw materials are dried and transported to the injection molding machine to convert the raw materials from solid to liquid.

The second step is to move the moving mold 1 toward the fixed mold 2, see F1 in Figure 2 for details, and start mold clamping.

In the third step, when the insert combination 1.1.1 contacts the fixed die 2, the movable cavity A is formed by the movable die 1, the fixed die 2 and the insert combination 1.1.1. See F2 in Figure 3 for details. The volume of the cavity is the largest, and the maximum distance that the second moving mechanism can move relative to the moving mold is L0.

In the fourth step, the moving mold 1 continues to move in the direction of the fixed mold 2 until the moving mold 1 is fitted with the second moving mechanism 1.1 and reaches a complete mold clamping state. See F3 in Fig. 4 for details. At this time, the movable cavity D is formed, and the volume of the movable cavity D is the smallest. At this time, the distance of the second moving mechanism 1.1 relative to the movable mold 1 is L1, L1=0, and the compression parameters of the movable mold 1 are set at the same time. This process is to correct the mold and let the injection molding machine sense the state of the smallest cavity of the mold. If the injection molding machine does not sense the correct state of the smallest cavity, it will cause an error in the amount of feed and lead to the raw materials required for product molding. too much or too little.

The fifth step is to control the moving distance of the moving mold 1 in the opposite direction of the second moving mechanism 1.1 through the sensor 1.4 according to the compression parameters of the moving mold 1 set above, and adjust the volume of the movable cavity to form a movable cavity. B, see F4 in Fig. 5 for details, make the movable cavity B in the working state, and the distance between the second moving mechanism and the moving mold 1 is L2 at this time.

The sixth step is to inject the liquid material into the movable cavity C at high speed and low pressure. At this time, the distance of the second moving mechanism relative to the moving mold is L3, see F5 in Figure 6 for details, and the injection speed is 1000mm/s , the injection pressure is 1800kgf/cm ² .

In the seventh step, the movable mold 1 moves, and the volume of the movable cavity changes from large to small to the required volume of the product to form the movable cavity E. See F6 in Figure 7 for details. At this time, the second moving mechanism is relative to the movement The distance of the modes is L4, L0>L2>L3>L4≥L1.

In the eighth step, the product is cooled and solidified. The moving mold moves in the opposite direction to the fixed mold, and the movable cavity is opened. See F7 in Figure 8 for details. The spring 1.6 connects the second moving mechanism 1.1 with the The moving mold 1 is ejected, and the second moving mechanism 1.1 moves relative to the moving mold 1 in the direction of the fixed mold 2. See F8 in FIG. 8 for details, and the product 4 is taken out from the moving mold.

The sequence of the two steps of injecting the liquid material into the movable cavity C in the sixth step and the working of the movable cavity in the seventh step is to start the seventh step in the process of injecting the liquid material into the movable cavity C in the sixth step. Step action, that is, after injecting a certain amount of liquid raw materials, the movable cavity starts to work, the moving mold 1 starts to move, and continues to keep the material injection to ensure that the raw materials required for the product molding are sufficient. When the raw materials required for the product are met , stop the injection, the volume of the movable cavity decreases from large to the required volume of the product, forming the movable cavity E, and the moving mold 1 stops moving. The volume of the movable cavity A>the volume of the movable cavity B>the volume of the movable cavity C>the volume of the movable cavity E≥the volume of the movable cavity D.

The working process of the mold with the movable cavity of the utility model using the composite material that is easy to separate from each other to produce the blank for the back cover of the mobile phone is as follows:

The mobile phone back cover blank needs to have both high hardness and high strength. .

Polymethyl methacrylate, or poly methyl methacrylate, referred to as PMMA, also known as acrylic, acrylic or plexiglass, has high transparency and brightness, good heat resistance, and has the characteristics of toughness, hardness and rigidity. As the raw material for forming the blank of the back cover of the mobile phone, the use effect of the blank of the back cover of the mobile phone with wear resistance and less scratches can be satisfied.

Polycarbonate, referred to as PC, is a high molecular polymer containing carbonate groups in the molecular chain. It is a tough thermoplastic resin with good impact resistance. It can be used as a raw material for mobile phone back cover blanks to meet the requirements of mobile phone back cover blanks. Drop and crack resistant use effect.

In order to meet the high hardness and high strength of mobile phone back cover blanks at the same time, PMMA+PC composite materials can be used to form mobile phone back cover blanks. However, in the traditional PMMA+PC composite material molding process, the injection speed range is above 500mm/s , the pressure range is 2800-3000kgf/cm ² . Due to the fast injection speed and high pressure, PMMA and PC are easily separated from each other, forming difficulty and low yield.

Due to the use of the movable cavity, the mold of the present utility model can be formed at low speed and low pressure compared with the traditional molding process. Because the injection speed is relatively slow and the pressure is relatively small, PMMA and PC are not easily separated from each other. , the molding difficulty becomes smaller, and the yield rate is greatly improved.

The process of using the PMMA+PC composite material to produce the mobile phone back cover blank for the mold with the movable cavity of the present invention is as follows:

The PMMA+PC composite material is dried and transported to the injection molding machine to convert the PMMA+PC composite material from solid to liquid.

The second step is to move the moving mold 1 toward the fixed mold 2, see F1 in Figure 2 for details, and start mold clamping.

In the third step, when the insert combination contacts the fixed die 2, the movable cavity A is composed of the movable die 1, the fixed die 2 and the insert combination 1.1.1. See F2 in Figure 3 for details. At this time, the volume of the movable cavity is At the same time, the maximum distance that the second moving mechanism 1.1 can move relative to the moving die 1 is L0.

In the fourth step, the moving mold 1 continues to move in the direction of the fixed mold 2 until the moving mold 1 is fitted with the second moving mechanism 1.1 and reaches a complete mold clamping state. See F3 in Fig. 4 for details. At this time, the movable cavity D is formed, and the volume of the movable cavity D is the smallest. At this time, the distance of the second moving mechanism 1.1 relative to the movable mold 1 is L1, L1=0, and the compression parameters of the movable mold 1 are set at the same time. This process is to correct the mold and let the injection molding machine sense the state of the smallest cavity of the mold. If the injection molding machine does not sense the correct state of the smallest cavity, it will cause an error in the amount of feed and lead to the raw materials required for product molding. too much or too little.

The fifth step is to control the moving distance of the moving mold 1 in the opposite direction of the second moving mechanism 1.1 through the sensor 1.4 according to the compression parameters of the moving mold 1 set above, and adjust the volume of the movable cavity to form a movable cavity. B, refer to F4 in Fig. 5 for details, make the movable cavity B in the working state, and the distance between the second moving mechanism and the moving mold is L2 at this time.

The sixth step is to inject the liquid material into the movable cavity C at low speed and low pressure. At this time, the distance between the second moving mechanism and the moving mold is L3, see F5 in Figure 6 for details, and the injection speed range is 180-330mm /s, the pressure range is 1500-2000kgf/cm ² , in this embodiment, the speed is 300mm/s, and the pressure is 1800kgf/cm ² .

In the seventh step, the movable mold 1 moves, and the volume of the movable cavity is reduced from large to the required volume of the product to form the movable cavity E. See F6 in Figure 7 for details. At this time, the second moving mechanism 1.1 is relative to the The distance of the moving mode 1 is L4, L0>L2>L3>L4≥L1.

In the eighth step, the product is cooled and solidified. The movable mold 1 moves in the opposite direction to the fixed mold 2 to open the movable cavity. See F7 in Figure 8 for details. The spring 1.6 moves the second moving mechanism 1.1 Bouncing away from the moving mold 1, the second moving mechanism 1.1 moves relative to the moving mold 1 in the direction of the fixed mold 2, see F8 in Figure 8 for details, and the product 4 moves from the moving mold 1 take out.

The sequence of the two steps of injecting the liquid material into the movable cavity C in the sixth step and the working of the movable cavity in the seventh step is to start the seventh step in the process of injecting the liquid material into the movable cavity C in the sixth step. Step action, that is, after injecting a certain amount of liquid raw materials, the movable cavity starts to work, the moving mold 1 starts to move, and continues to keep the material injection to ensure that the raw materials required for the product molding are sufficient. When the raw materials required for the product are met , stop the injection, the volume of the movable cavity decreases from large to the required volume of the product, forming the movable cavity E, and the moving mold 1 stops moving. The volume of the movable cavity A>the volume of the movable cavity B>the volume of the movable cavity C>the volume of the movable cavity E≥the volume of the movable cavity D.

Compared with the prior art, the utility model has the following beneficial effects: when a movable cavity is provided, the size of the movable cavity can be adjusted according to the needs of the product, so that the volume of the movable cavity before the compression is stopped is greater than the volume of the product, and The resistance to the flow of liquid raw materials in the movable cavity with a larger volume will become smaller, the liquid raw materials will flow easily, the product will be easy to form at low speed or low pressure, and the product has good internal stress, beautiful appearance, uniform thickness, and composite materials are not easy to separate from each other.

What is disclosed above is only the preferred embodiment of the present invention, of course, it cannot limit the scope of rights of the present invention. Therefore, the equivalent changes made according to the scope of the present invention are still covered by the present invention. scope.

Claims (10)

1. A mould with a movable cavity comprises a movable mould and a fixed mould, wherein the movable mould is provided with a movable mould supporting device, the fixed die is provided with a fixed die supporting device, the movable die and the fixed die are matched with each other, the movable die is provided with a movable die core, the fixed die is provided with a fixed die core, it is characterized by also comprising a guide component, a water channel device and a positioning structure, wherein the movable die comprises a secondary moving mechanism and a limiting device, the second moving mechanism is movably connected with the moving die through the guide assembly and the limiting device, the mold core of the moving mold is positioned on the supporting device of the moving mold through the positioning structure, the mould core of the fixed mould is positioned on the supporting device of the fixed mould through the positioning structure, and the water channel device is distributed in the movable mould and the fixed mould.

2. The mold with the movable cavity according to claim 1, wherein: the secondary moving mechanism comprises a moving bearing device, an insert combination and a connecting piece, the insert combination is fixed on the moving bearing device through the connecting piece, the insert combination, the moving die core and the fixed die core form a movable die cavity, the exhaust device is arranged around the movable die cavity, and the insert combination is directly or indirectly positioned on the supporting device of the moving die through the positioning structure.

3. The mold having a movable cavity according to claim 2, wherein: the exhaust device comprises an air groove, exhaust gaps and an exhaust channel, the exhaust gaps are communicated with the air groove, the number of the exhaust gaps is two or more, and the size of each exhaust gap is set according to the difference of the positions of the molds where the exhaust gaps are located.

4. The mold having a movable cavity according to claim 3, wherein: the size of the exhaust gap is changed from the most proximal end of the feed inlet to the most distal end of the feed inlet, or the size of the exhaust gap is changed from the position where the mold is most easily molded to the position where the mold is most difficult to mold.

5. The mold with the movable cavity according to claim 1, wherein: the positioning structure comprises a sprue bush insert, a feeding port insert and a positioning pin, the sprue bush insert is installed at the central position of the fixed die through the positioning pin, and the feeding port insert is installed at the central position of the movable die through the positioning pin.

6. The mold having a movable cavity according to claim 2, wherein: the positioning structure comprises a sprue bush insert, a feeding port insert and a positioning pin, the sprue bush insert is installed at the central position of the fixed die through the positioning pin, and the feeding port insert is installed at the central position of the movable die through the positioning pin.

7. The mold having a movable cavity according to claim 3, wherein: the positioning structure comprises a sprue bush insert, a feeding port insert and a positioning pin, the sprue bush insert is installed at the central position of the fixed die through the positioning pin, and the feeding port insert is installed at the central position of the movable die through the positioning pin.

8. The mold with the movable cavity according to claim 4, wherein: the positioning structure comprises a sprue bush insert, a feeding port insert and a positioning pin, the sprue bush insert is installed at the central position of the fixed die through the positioning pin, and the feeding port insert is installed at the central position of the movable die through the positioning pin.

9. The mold having a movable cavity according to claim 8, wherein: the number of the movable cavities is one or more than one.

10. The mold having a movable cavity according to claim 9, wherein: the size of the exhaust gap is L, and L is more than or equal to 0.005mm and less than or equal to 0.05 mm.

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