Hot runner sprue structure capable of preventing long glass fiber from being cut off
By using a flared hot nozzle outlet and a conical protrusion-designed gate structure, combined with a cooling water well, the problem of long glass fibers being cut at the gate is solved, improving the quality and production efficiency of injection molded products and extending the service life of the mold.
Patent Information
- Application Number
- CN202520278561.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-02-21
AI Technical Summary
In the process of injection molding long glass fiber reinforced thermoplastic products, unreasonable hot runner gate design can cause long glass fibers to be sheared and broken at the gate, and the broken glass fibers are prone to accumulate, affecting production efficiency and product quality.
The hot runner is designed with a flared nozzle shape and a molding platform is set in the lower mold. The conical protrusion makes the material flow in an umbrella shape. Combined with the cooling water well, the gate structure is optimized to reduce the cutting force and prevent long glass fibers from being cut.
It effectively prevents long glass fibers from being cut at the gate, improves the quality and production efficiency of injection molded products, and extends the service life of molds.
Smart Images
Figure CN223850055U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a mould structure technical field, specifically, relate to a prevent long glass fiber cut off's hot runner gate structure. BACKGROUND
[0002] In the process of injection molding long glass fiber reinforced thermoplastic plastic product, the unreasonable design of hot runner gate can cause long glass fiber to be sheared and broken at the gate. Specifically, the hot nozzle gate is directly opposite the product plane, so that the flow directly hits the plane after entering from the gate, and the flow directly turns 90 degrees to flow around after coming out of the hot nozzle, which can cause large shear force at the gate and long glass fiber to be easily cut off. In addition, the broken glass fiber is easy to accumulate at the gate, which can hinder the flow of plastic melt and cause problems such as gate clogging, thereby affecting production efficiency and product quality. SUMMARY
[0003] The utility model discloses a prevent long glass fiber cut off's hot runner gate structure, aims at solving the above-mentioned problem.
[0004] The utility model adopts the following schemes:
[0005] A kind of prevent long glass fiber cut off's hot runner gate structure, including upper die and lower die, the upper die and lower die form product cavity, and hot nozzle is set in the upper die with the product cavity for passing into flow, including: the position of the lower die is set with modeling table opposite the discharge port of the hot nozzle;Wherein, the discharge port of the hot nozzle is set into horn mouth shape, the conical protrusion that the horn mouth shape discharge port is directly opposite is set on the modeling table to make flow from discharge port enter after being umbrella-shaped and flow around.
[0006] Further, the height of the surface of the modeling table from the gate is 6.4mm-16.8mm.
[0007] Further, the height of the top end of the conical protrusion from the gate is 3±1mm.
[0008] Further, the side of the modeling table away from the gate is provided with cooling water well.
[0009] Further, the thickness of the cooling water well from the outer surface of the modeling table is 8±1mm.
[0010] Beneficial effects:
[0011] This solution elevates the gate, designs a flared outlet, and incorporates a molding platform in the lower mold with conical protrusions. This creates a herringbone-shaped, umbrella-like flow of material at the gate, effectively reducing shear forces and preventing long glass fibers from being cut. Furthermore, by reducing pressure at the gate and designing cooling water wells, the injection molding process is further optimized, improving product quality. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of a hot runner gate structure for preventing long glass fibers from being cut, according to an embodiment of this utility model.
[0013] Figure 2 This is a schematic diagram of a molding table structure for a hot runner gate structure that prevents long glass fibers from being cut, according to an embodiment of this utility model.
[0014] Figure 3 This is a schematic diagram of a hot nozzle structure for a hot runner gate structure that prevents long glass fibers from being cut, according to an embodiment of this utility model.
[0015] Figure 4 yes Figure 1 Enlarged structural diagram of the intermediate gate;
[0016] Figure reference numerals: 1. Upper mold; 2. Lower mold; 3. Product cavity; 4. Gate; 5. Hot runner; 6. Feed channel; 61. Outlet; 7. Molding platform; 71. Conical protrusion; 72. Cooling water well. Detailed Implementation
[0017] Combination Figures 1 to 4 As shown, this embodiment provides a mold, including an upper mold 1 and a lower mold 2, which form a product cavity 3. A hot runner 5 communicating with the product cavity 3 is provided on the upper mold 1 for material flow. A hot runner gate structure to prevent long glass fibers from being cut is provided at the gate 4 near the hot runner 5 in the product cavity 3. The hot runner gate 4 structure to prevent long glass fibers from being cut includes: a molding platform 7 positioned on the lower mold 2 opposite to the outlet 61 of the hot runner 5; wherein the outlet 61 of the hot runner 5 is shaped like a flared mouth, and the molding platform 7 has a conical protrusion 71 directly opposite the flared outlet 61 so that the material flow from the outlet 61 flows outwards in an umbrella-like shape.
[0018] In the embodiment, the product cavity 3 is suitable for the product to form a corresponding shape after the material flow enters. The hot nozzle 5 is detachably replaced in the upper mold 1, that is, the hot nozzle 5 is connected to the upper mold 1 by detachable installation. The feeding channel 6 is formed in the hot nozzle 5, and the gate 4 of the product is formed at the discharge port 61 of the feeding channel 6. Specifically, the flared horn shape is formed at the discharge port 61 to match the conical protrusion 71 of the molding table 7 so that the material flow flows umbrella-shaped around the gate 4.
[0019] In combination with Figure 1 and Figure 2 As shown in the figure, the molding table 7 is detachably arranged in the lower mold 2, the top of the molding table 7 is formed with a plane, and a conical protrusion 71 upwardly is formed in the middle of the plane, which is coaxially arranged below the discharge port 61 of the flared horn shape, and the side surface of the conical protrusion 71 is in the shape of an arc line, which makes the material flow enter from the gate 4 and be dispersed by the conical protrusion 71 at the discharge port 61, and flows umbrella-shaped around along the outer surface of the conical protrusion 71, instead of turning at a right angle of 90°, effectively reducing the shear force of the product at the gate 4, thereby preventing the long glass fiber from being cut off.
[0020] In the embodiment, by arranging the detachable molding table 7, the molding table 7 can be replaced as needed to adapt to different product structures, improving the applicability of the mold.
[0021] In combination with Figure 1 and Figure 4 As shown in the figure, in the preferred embodiment, the height a of the gate 4 is 5mm-15mm, which can further reduce the shear force at the gate 4. Further, the distance between the top end of the conical protrusion 71 and the height b of the gate 4 is 3±1mm, which can reduce the pressure at the gate 4, thereby effectively avoiding the long glass fiber from being cut off. In the embodiment, the thickness of the product is controlled to be 1.4mm-1.8mm.
[0022] In another embodiment, the cooling water well 72 is arranged on the side of the molding table 7 away from the gate 4; the thickness of the cooling water well 72 away from the outer surface of the molding table 7 is 8±1mm. By designing the cooling water well 72 opposite to the gate 4, and the distance between the water well and the product is about 8mm, the gate 4 can also be avoided to be too hot to stick to the valve needle, thereby prolonging the service life of the mold.
[0023] Through the above-mentioned embodiments, the long glass fiber can be effectively prevented from being cut off at the gate 4, and the product quality and production efficiency of injection molding are improved.
[0024] It should be understood that the above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application.
[0025] The above introduction of the drawings used in the embodiments only shows some embodiments of the present application, and should not be regarded as a limitation on the scope, and for ordinary skilled in the art, other related drawings can also be obtained according to the drawings without creative labor.
Claims
1. A hot runner gate structure for preventing long glass fiber cut-off comprising an upper mold and a lower mold, said upper mold and lower mold forming a product cavity, and a hot nozzle is provided in said upper mold communicating with said product cavity for passing in a flow, characterized in that, The application relates to a hot nozzle for a casting machine, comprising: A molding table is arranged opposite to the discharge port of the hot nozzle; wherein the discharge port of the hot nozzle is arranged in a horn shape, and a conical protrusion is arranged on the molding table to be opposite to the horn-shaped discharge port so that the material flow is in an umbrella shape after entering from the discharge port.
2. The hot runner gate structure for preventing long glass fiber cut-off according to claim 1, wherein The height of the surface of the molding table from the gate is 6.4mm-16.8mm.
3. The hot runner gate structure for preventing long glass fiber cut-off according to claim 2, wherein The height of the top end of the conical protrusion from the gate is 3+ / -1mm.
4. The hot runner gate structure for preventing long glass fiber cut-off according to claim 1, wherein A cooling water well is arranged on the side of the molding table away from the gate.
5. The hot runner gate structure for preventing long glass fiber cut-off according to claim 4, wherein The thickness of the cooling water well from the outer surface of the molding table is 8+ / -1mm.