Molding equipment for full-face mask body with total heat nozzle glue feeding

Abstract

This disclosure provides a molding apparatus for a fully hot-nozzle injection system for a respirator face mask. The apparatus includes a mold core assembly and a hot-nozzle injection assembly. The mold core assembly includes an upper mold and a lower mold. A thin-walled cavity is formed between the molding protrusion of the upper mold and the lower mold. The upper mold has an injection mounting hole communicating with the thin-walled cavity. The hot-nozzle injection assembly includes a hot-nozzle component and a cooling liner component. The cooling liner component is fitted onto the hot-nozzle component and installed in the injection mounting hole. A first cooling groove, an annular runner, and a second cooling groove are sequentially connected on the outer side of the cooling liner component. Full hot-nozzle injection eliminates the generation of waste material from the cold runner, reducing production costs. Precise temperature control of the hot-nozzle tip temperature controls melt flow, preventing solidification at the melt front due to low temperatures and reducing the impact of temperature on the molding process. The gate is located inside the respirator face mask, improving the product's appearance quality.

Description

Technical Field

[0001] This disclosure relates to the technical field of respirator manufacturing, and in particular to a molding apparatus for fully heated nozzle injection of adhesive into a respirator body. Background Technology

[0002] Polycarbonate (PC) is a transparent, high-strength, and impact-resistant thermoplastic engineering plastic. PC can be used to produce transparent breathing masks. These masks are ergonomically designed, with a curved, thin-walled structure that conforms to the face.

[0003] Breathing masks are injection molded using a mold. Molten polycarbonate (PC) enters the mold cavity to form the breathing mask. Existing molds require the PC to enter the runner through a sprue, and then from the runner into the cavity to form the thin-walled breathing mask. The temperature of the PC at the sprue is relatively high, requiring a long cold runner to enter the cavity. This results in a significant amount of waste PC formed in the cold runner, leading to higher production costs. Furthermore, the internal space of the breathing mask is relatively small, and the mold temperature has a significant impact on the thin-walled breathing mask within the cavity, making it prone to deformation.

[0004] For example, the prior art document CN202220057327.2 discloses an injection mold for a plastic part of a gas mask, including a base plate, a pad fixedly connected to the upper end of the base plate, a fixed template fixedly connected to the upper end of the pad plate, a guide post fixedly connected inside the fixed template, a movable template slidably connected to the circumferential surface of the guide post, a runner formed on the upper end face of the movable template, an ejector slidably connected inside the runner, a mold core fixedly connected inside the fixed template, and a cooling device inside the mold core and mold part. This design has a long runner path into the cavity, resulting in more waste material and higher production costs. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a molding apparatus for a breathing mask body with fully heated nozzle injection that saves materials and reduces deformation during the molding process.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A molding apparatus for injecting adhesive into a fully heated nozzle of a breathing mask body includes a mold core assembly and an adhesive injection nozzle assembly. The mold core assembly includes an upper mold and a lower mold. The upper mold has a molding protrusion. A thin-walled cavity is formed between the molding protrusion and the lower mold. The upper mold has an adhesive injection mounting hole communicating with the thin-walled cavity. The adhesive injection mounting hole is located inside the molding protrusion and is adjacent to the inner side of the thin-walled cavity.

[0008] The hot nozzle assembly includes a hot nozzle component and a cooling liner component. The cooling liner component is fitted onto the hot nozzle component and installed in the glue inlet mounting hole. The glue outlet at the end of the hot nozzle component is connected to the thin-walled cavity. A first cooling groove and a second cooling groove are formed on the outer side of the cooling liner component. An annular flow channel is formed between the outer wall of the cooling liner component and the wall of the glue inlet mounting hole. The annular flow channel wraps around the end of the hot nozzle component. The first cooling groove, the annular flow channel, and the second cooling groove are connected in sequence to form a first cooling flow channel. The upper mold also has a liquid inlet channel and a liquid outlet channel. The first cooling groove is connected to the liquid inlet channel, and the second cooling groove is connected to the liquid outlet channel.

[0009] In one embodiment, the first cooling tank and the second cooling tank are spaced apart circumferentially along the cooling liner kit.

[0010] In one embodiment, the first cooling tank includes a first connecting tank, a first cooling surrounding tank, and a second connecting tank connected in sequence. The first connecting tank is connected to the liquid inlet channel, and the second connecting tank is connected to the annular channel. The second cooling tank includes a third connecting tank, a second cooling surrounding tank, and a fourth connecting tank connected in sequence. The liquid outlet channel is connected to the third connecting tank, and the fourth connecting tank is connected to the annular channel. The first cooling surrounding tank and the second cooling surrounding tank respectively cover the circumferential portion of the cooling liner.

[0011] In one embodiment, the first connecting groove is disposed above the first cooling surrounding groove along the axial direction of the cooling liner, and the third connecting groove is disposed above the second cooling surrounding groove along the axial direction of the cooling liner.

[0012] In one embodiment, the cooling liner kit has two symmetrically arranged limiting grooves at one end away from the thin-walled cavity, the limiting grooves being used to limit the installation of the cooling liner kit.

[0013] In one embodiment, the thin-walled cavity is a conical curved surface structure, which is used to conform to a human face.

[0014] In one embodiment, the minimum distance between the annular flow channel and the thin-walled cavity is 2mm-4mm.

[0015] In one embodiment, the cooling liner kit has an annular protrusion at one end facing the thin-walled cavity, and the glue inlet mounting hole has an annular mounting groove, with the annular protrusion corresponding to the annular mounting groove.

[0016] In one embodiment, the hot nozzle assembly further includes a seal, and an annular sealing groove is provided in the annular mounting groove. The annular sealing groove is located below the annular flow channel, and the seal is installed in the annular sealing groove.

[0017] In one embodiment, the upper mold is further provided with mold core cooling channels, and the number of mold core cooling channels is multiple, with the multiple mold core cooling channels spaced apart on the upper mold.

[0018] Compared with the prior art, this disclosure has at least the following advantages:

[0019] The aforementioned hot-nozzle injection molding equipment for respirator masks allows molten material to directly enter the thin-walled cavity through the hot nozzle. The melt remains molten throughout the process with minimal pressure fluctuations, improving the filling effect of the thin-walled cavity and achieving hot-nozzle injection. This eliminates the generation of cold runner waste, thereby increasing the utilization rate of molten material and reducing production costs. Local temperature control of the hot nozzle and molding protrusions via a cooling liner ensures precise temperature control at the tip of the hot nozzle within the optimal material flow window, preventing solidification at the melt front due to low temperatures and reducing deformation of the respirator mask during molding. This minimizes the impact of temperature on the respirator mask molding process. Furthermore, the injection port between the hot nozzle and the thin-walled cavity is hidden inside the molded respirator mask, placing the gate inside the respirator mask and improving the product's appearance quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional view of a molding apparatus for a fully heated nozzle injection system of a breathing mask body, according to an embodiment.

[0022] Figure 2 for Figure 1 A partial cross-sectional view of the molding equipment for the fully heated nozzle of the breathing mask shown;

[0023] Figure 3 for Figure 1 The exploded view of a partial part of the molding equipment for the fully heated nozzle of the breathing mask shown.

[0024] Figure 4 for Figure 1 Another exploded view of the molding equipment for the fully heated nozzle of the breathing mask shown;

[0025] Figure 5 for Figure 1 Another partial cross-sectional view of the molding equipment for the fully heated nozzle of the breathing mask shown. Detailed Implementation

[0026] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0030] Please see Figures 1 to 5 As shown, this is a molding apparatus 10 for injecting adhesive into a fully heated nozzle of a breathing mask according to an embodiment of the present disclosure. It includes a mold core assembly 100 and an adhesive injection nozzle assembly 200. The mold core assembly 100 includes an upper mold 110 and a lower mold 120. The upper mold 110 has a molding protrusion 111. A thin-walled cavity 101 is formed between the molding protrusion 111 and the lower mold 120. The upper mold 110 has an adhesive injection mounting hole 1101 communicating with the thin-walled cavity 101. The adhesive injection mounting hole 1101 is disposed in the molding protrusion 111 and is adjacent to the inner side of the thin-walled cavity 101.

[0031] Furthermore, the hot nozzle assembly 200 includes a hot nozzle component 210 and a cooling liner component 220. The cooling liner component 220 is sleeved on the hot nozzle component 210 and installed in the glue inlet mounting hole 1101. The glue outlet at the end of the hot nozzle component 210 communicates with the thin-walled cavity 101. A first cooling groove 2201 and a second cooling groove 2202 are formed on the outer side of the cooling liner component 220. The outer wall of the cooling liner component 220 is flush with the glue inlet mounting hole 1101. An annular flow channel 2203 is formed between the holes of 01. The annular flow channel 2203 wraps around the end of the hot nozzle 210. The first cooling groove 2201, the annular flow channel 2203 and the second cooling groove 2202 are connected in sequence to form the first cooling flow channel. The upper mold 110 is provided with an inlet flow channel 1102 and an outlet flow channel 1103. The first cooling groove 2201 is connected to the inlet flow channel 1102 and the second cooling groove 2202 is connected to the outlet flow channel 1103.

[0032] In this embodiment, after the upper mold 110 and the lower mold 120 are closed, the forming protrusion 111 and the lower mold 120 form a thin-walled cavity 101 with a conical curved surface. The molten material enters the thin-walled cavity 101 after passing through the hot nozzle 210. The hot nozzle maintains the fluidity of the melt through a built-in heating element, ensuring that the thin-walled cavity 101 is completely filled, thus achieving full hot nozzle injection. After the coolant enters from the liquid inlet channel 1102 of the upper mold 110, the coolant passes through the first cooling tank 2201, the annular channel 2203, the second cooling tank 2202, and the liquid outlet channel 1103 in sequence. The cooling liner 220 provides localized enhanced cooling for the hot nozzle 210 and the forming protrusion 111, preventing the breathing mask formed by the thin-walled cavity 101 from being affected by the high temperature of the hot nozzle 210. Understandably, when manufacturing the components of the full-heat nozzle injection molding equipment 10 for the breathing mask body, the equipment can be processed without 3D printing. The cooling liner kit 220 can be detachably installed in the injection mounting hole 1101. The cooling liner kit 220, the upper mold 110, and the lower mold 120 are formed by CNC milling or wire cutting, which reduces the manufacturing cost of the full-heat nozzle injection molding equipment 10 for the breathing mask body.

[0033] The aforementioned hot-nozzle injection molding equipment 10 for the respirator mask body allows molten material to directly enter the thin-walled cavity 101 through the hot nozzle 210. The melt remains molten throughout the process with minimal pressure fluctuations, improving the filling effect of the thin-walled cavity 101 and achieving hot-nozzle injection. This eliminates the generation of cold runner waste, thereby increasing the utilization rate of the molten material and reducing production costs. Through the local temperature control of the hot nozzle 210 and the molding protrusion 111 by the cooling liner 220, the temperature at the end of the hot nozzle 210 is precisely controlled within the optimal material flow window, preventing the melt front from solidifying due to low temperatures. This reduces the deformation of the respirator mask body during molding, thus reducing the impact of temperature on the respirator mask molding process. The injection port between the hot nozzle 210 and the thin-walled cavity 101 is hidden inside the molded respirator mask, placing the gate inside the respirator mask body and improving the product's appearance quality.

[0034] like Figures 2 to 4 As shown, in one embodiment, the first cooling tank 2201 and the second cooling tank 2202 are spaced apart circumferentially along the cooling liner 220. In this embodiment, the spaced-apart first cooling tank 2201 and second cooling tank 2202 form independent flow channels, optimizing the flow path of the coolant on the cooling liner 220. The coolant fluid forms turbulence within the flow channels, improving heat exchange efficiency, and the first cooling tank 2201 and second cooling tank 2202 are convenient for milling or wire cutting.

[0035] like Figure 2 and Figure 3As shown, in one embodiment, the first cooling tank 2201 includes a first connecting tank 2204, a first cooling surrounding tank 2205, and a second connecting tank 2206 connected in sequence. The first connecting tank 2204 is connected to the liquid inlet channel 1102, and the second connecting tank 2206 is connected to the annular channel 2203. The second cooling tank 2202 includes a third connecting tank 2207, a second cooling surrounding tank 2208, and a fourth connecting tank 2209 connected in sequence. The liquid outlet channel 1103 is connected to the third connecting tank 2207, and the fourth connecting tank 2209 is connected to the annular channel 2203. The first cooling surrounding tank 2205 and the second cooling surrounding tank 2208 respectively cover the circumferential portion of the cooling liner 220. In this embodiment, the first cooling surround groove 2205 and the second cooling surround groove 2208 form a discontinuous cooling region along the cooling liner 220. The first cooling surround groove 2205 and the second cooling surround groove 2208 provide locally enhanced cooling to the covered hot nozzle 210, optimizing the cooling path and making the temperature distribution of the cooling liner 220 more uniform. Furthermore, both the first cooling surround groove 2205 and the second cooling surround groove 2208 are formed with a U-shaped structure. The U-shaped structure increases the coverage of the cooling path and further improves the cooling effect on the cooling liner 220.

[0036] like Figure 3 As shown, in one embodiment, the first connecting groove 2204 is disposed above the first cooling surrounding groove 2205 along the axial direction of the cooling liner 220, and the third connecting groove 2207 is disposed above the second cooling surrounding groove 2208 along the axial direction of the cooling liner 220. In this embodiment, the first connecting groove 2204, the first cooling surrounding groove 2205, and the second connecting groove 2206 are disposed axially, and the third connecting groove 2207, the second cooling surrounding groove 2208, and the fourth connecting groove 2209 are disposed axially, so that the coolant flows smoothly from top to bottom into the surrounding groove, and the coolant is evenly distributed in the axial direction, thereby improving the cooling effect of the coolant on the hot runner 210.

[0037] like Figure 3 As shown, in one embodiment, the cooling liner 220 has two symmetrically arranged limiting grooves 2210 at the end opposite to the thin-walled cavity 101. The limiting grooves 2210 are used to limit the installation of the cooling liner 220. In this embodiment, the upper mold 110 also has a positioning hole. The two symmetrically arranged limiting grooves 2210 cooperate with the positioning pin for installation, so that the installation position of the cooling liner 220 is fixed, thereby enabling quick installation of the cooling liner 220.

[0038] like Figure 1 and Figure 4As shown, in one embodiment, the thin-walled cavity 101 is a conical curved surface structure, which is used to conform to the human face. In this embodiment, the thin-walled cavity 101 forms a breathing mask body with a thin-walled conical curved surface structure, which makes the breathing mask body more comfortable and conforms to the human face.

[0039] like Figure 2 As shown, in one embodiment, the minimum distance between the annular flow channel 2203 and the thin-walled cavity 101 is 2mm-4mm. In this embodiment, the thin-walled concave structure of the respirator 20 requires the hot nozzle 210 to be inserted into the inner side of the thin-walled cavity to achieve full hot nozzle injection. The distance between the thin-walled cavity 101 and the hot nozzle 210 is small, and it is necessary to reduce the influence of the temperature of the hot nozzle 210 and the annular flow channel 2203 on the PC melt in the adjacent thin-walled cavity 101. When the distance is less than 2mm, the cooling effect of the annular flow channel 2203 is too strong, which can easily cause the melt in the adjacent thin-walled cavity 101 to freeze prematurely, thereby affecting the deformation of the formed respirator 2203. When the distance is greater than 4mm, the distance between the annular flow channel 2203 and the adjacent thin-walled cavity 101 is too long, which affects the cooling effect of the annular flow channel 2203 on the melt in the thin-walled cavity 101.

[0040] like Figure 2 and Figure 3 As shown, in one embodiment, the cooling liner 220 has an annular protrusion 221 protruding from one end facing the thin-walled cavity 101, and the glue inlet mounting hole 1101 has an annular mounting groove 1104. The annular protrusion 221 is correspondingly installed in the annular mounting groove 1104. In this embodiment, the cooling liner 220 is installed by adapting the annular protrusion 221 to the annular mounting groove 1104, thereby positioning the cooling liner 220 within the glue inlet mounting hole 1101. This improves the tightness of the fit between the cooling liner 220 and the glue inlet mounting hole 1101, and forms an annular stepped structure at one end of the cooling liner 220, reducing the amount of coolant entering the gap between the cooling liner 220 and the glue inlet mounting hole 1101.

[0041] like Figure 2 As shown, in one embodiment, the hot nozzle assembly 200 further includes a seal 230, and an annular sealing groove 1105 is also formed in the annular mounting groove 1104. The annular sealing groove 1105 is located below the annular flow channel 2203, and the seal 230 is installed in the annular sealing groove 1105. In this embodiment, the seal 230 is used to seal the gap between the cooling liner 220 and the hot nozzle mounting hole 1101, preventing coolant from entering the thin-walled cavity 101.

[0042] like Figure 5As shown, in one embodiment, the upper mold 110 is further provided with mold core cooling channels 1106. The number of mold core cooling channels 1106 is plurality of them, and the plurality of mold core cooling channels 1106 are spaced apart on the upper mold 110. In this embodiment, by spaced apart by the plurality of mold core cooling channels 1106, the temperature of the upper mold 110 is controlled to be uniform, thereby reducing the impact of temperature differences on the forming process of the breathing mask body of the thin-walled cavity 101.

[0043] Compared with the prior art, this disclosure has at least the following advantages:

[0044] The aforementioned hot-nozzle injection molding equipment 10 for the respirator mask body allows molten material to directly enter the thin-walled cavity 101 through the hot nozzle 210. The melt remains molten throughout the process with minimal pressure fluctuations, improving the filling effect of the thin-walled cavity 101 and achieving hot-nozzle injection. This eliminates the generation of cold runner waste, thereby increasing the utilization rate of the molten material and reducing production costs. Through the local temperature control of the hot nozzle 210 and the molding protrusion 111 by the cooling liner 220, the temperature at the end of the hot nozzle 210 is precisely controlled within the optimal material flow window, preventing the melt front from solidifying due to low temperatures. This reduces the deformation of the respirator mask body during molding, thus reducing the impact of temperature on the respirator mask molding process. The injection port between the hot nozzle 210 and the thin-walled cavity 101 is hidden inside the molded respirator mask, placing the gate inside the respirator mask body and improving the product's appearance quality.

[0045] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A molding device for fully heated nozzle injection of a breathing mask body, characterized in that, The device includes a mold core assembly and a hot nozzle assembly. The mold core assembly includes an upper mold and a lower mold. The upper mold has a forming protrusion. A thin-walled cavity is formed between the forming protrusion and the lower mold. The upper mold has a hot nozzle mounting hole communicating with the thin-walled cavity. The hot nozzle mounting hole is located inside the forming protrusion and is adjacent to the inner side of the thin-walled cavity. The hot nozzle assembly includes a hot nozzle component and a cooling liner component. The cooling liner component is fitted onto the hot nozzle component and installed in the glue inlet mounting hole. The glue outlet at the end of the hot nozzle component is connected to the thin-walled cavity. A first cooling groove and a second cooling groove are formed on the outer side of the cooling liner component. An annular flow channel is formed between the outer wall of the cooling liner component and the wall of the glue inlet mounting hole. The annular flow channel wraps around the end of the hot nozzle component. The first cooling groove, the annular flow channel, and the second cooling groove are connected in sequence to form a first cooling flow channel. The upper mold also has a liquid inlet channel and a liquid outlet channel. The first cooling groove is connected to the liquid inlet channel, and the second cooling groove is connected to the liquid outlet channel.

2. The molding equipment for the fully heated nozzle of the breathing mask body according to claim 1, characterized in that, The first cooling tank and the second cooling tank are spaced apart along the circumference of the cooling liner kit.

3. The molding equipment for the fully heated nozzle of the breathing mask body according to claim 2, characterized in that, The first cooling tank includes a first connecting tank, a first cooling surrounding tank, and a second connecting tank connected in sequence. The first connecting tank is connected to the liquid inlet channel, and the second connecting tank is connected to the annular channel. The second cooling tank includes a third connecting tank, a second cooling surrounding tank, and a fourth connecting tank connected in sequence. The liquid outlet channel is connected to the third connecting tank, and the fourth connecting tank is connected to the annular channel. The first cooling surrounding tank and the second cooling surrounding tank respectively cover the circumferential portion of the cooling liner.

4. The molding equipment for the fully heated nozzle injection of a breathing mask body according to claim 3, characterized in that, The first connecting groove is disposed above the first cooling surrounding groove along the axial direction of the cooling liner, and the third connecting groove is disposed above the second cooling surrounding groove along the axial direction of the cooling liner.

5. The molding equipment for the fully heated nozzle injection of a breathing mask body according to claim 2, characterized in that, The cooling liner kit has two symmetrically arranged limiting grooves at one end away from the thin-walled cavity. The limiting grooves are used to limit the installation of the cooling liner kit.

6. The molding equipment for the fully heated nozzle injection of a breathing mask body according to claim 1, characterized in that, The thin-walled cavity has a conical curved surface structure, which is used to fit the human face.

7. The molding equipment for the fully heated nozzle of a breathing mask body according to claim 6, characterized in that, The minimum distance between the annular flow channel and the thin-walled cavity is 2mm-4mm.

8. The molding equipment for the fully heated nozzle injection of a breathing mask body according to claim 1, characterized in that, The cooling liner kit has an annular protrusion at one end facing the thin-walled cavity, and the glue inlet mounting hole has an annular mounting groove, with the annular protrusion corresponding to the annular mounting groove.

9. The molding equipment for the fully heated nozzle of a breathing mask body according to claim 8, characterized in that, The hot nozzle assembly also includes a seal, and an annular sealing groove is provided in the annular mounting groove. The annular sealing groove is located below the annular flow channel, and the seal is installed in the annular sealing groove.

10. The molding equipment for the fully heated nozzle injection of a breathing mask body according to claim 1, characterized in that, The upper mold is also provided with mold core cooling channels, and there are multiple mold core cooling channels, which are spaced apart on the upper mold.

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