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Solutions for air marks at the water outlet position of the mold and drag damage at the water outlet position of the battery frame

• 2025-08-27

Solutions for air marks at the water outlet position of the mold and drag damage at the water outlet position of the battery frame

Air pattern one at the nozzle position of the mold

Phenomenon: The product is submerged in glue, and the surface is prone to air streaks.

Characteristics of injection molding machines

Plasticizing capacity: 133g, clamping force: 100t, grade: DEMAG

(2) Mold characteristics

Mold ejection number :1x2, glue injection method: submersible gate, ejection method: push plate ejection, mold temperature :100℃ (constant

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(3) Product characteristics

Material :PC, Color: Gray, Product weight (single piece) : 4g, nozzle weight: 5g

(4) Analysis of causes of defects

1. The product features a submersible gate with a relatively small entry point. During rapid injection, the air streaks at the gate position can basically be improved,It's because the edge of the spout is too large to be processed. At slow speed, the product is short of glue and has more air streaks, but there is no flash on the edge of the spout.

2. Due to the small size of the product's injection port, when the injection molding machine injects a certain amount of material into the mold cavity in parallel, at the water inlet, there areThe glue entry point is too small, and suddenly the flow channel becomes smaller. Within a certain period of time, the direction of the glue material cannot be completed in the direction aroundglue entry portWandering and squeezing create air streaks.

(5) Countermeasures

1. Modify the mold of the product's glue entry port to change it to a direct entry gate. In this way, the glue inlet becomes larger, the injection pressure decreases, and the water outletThe edge flanges are also smaller and easier to process, which is more conducive to improving the air patterns at the water outlet position.

2. Use a higher mold temperature to increase the mold temperature, making the temperature of the plastic closer to the mold temperature, and the plastic has good conditions within the mold cavity

Fluidity enables smooth and unobstructed forward flow, thereby reducing air streaks.

3. In the first stage, inject at a relatively slow speed to reach the water outlet. After passing the air crease position, inject quickly and switch to the second stageInjection molding.

Automobile fuse box Manufacturer in China (jfmoulds.com)

Air pattern two at the nozzle position of the mold

Characteristics of injection molding machines

Clamping force: 100t, plasticizing capacity: 133g, grade: DEMAG

(2) Mold characteristics

Mold ejection number: 1x2, glue injection method: direct injection, ejection method: push plate ejection, mold temperature: 115℃ (constant temperature machine)

(3) Product characteristics

Material :PC, Color: Gray, Product weight (single piece) : 2g, nozzle weight :5g

(4) The occurrence of adverse causes

1. The direct-in gate is not conducive to the adjustment of the water flow pattern of the product.

2. The material used is PC material, and it is difficult to improve the air texture.

(5) Analysis of causes of defects

The position of the injection port of the direct-in gate is relatively large. When the plastic is pushed into the mold cavity by injection pressure and reaches the gate, it cannot stay thereJust pass through the glue opening position. Originally, this kind of glue entry method should be slow to effectively improve the air lines, but due to the large glue entry opening, the speed is increasedThe flow rate of the plastic was reduced, resulting in the air streaks not being improved properly due to excessive speed.

2. In injection molding production, PC material often shows air streaks at the sprue position. This is because PC material has poor fluidity and in the raw materialThere are certain preservatives that hinder the fluidity of plastics.

3. Slow speed can improve the air lines, but it will result in less glue and shrinkage of the product. Therefore, it is necessary to inject it quickly to make the product full. But speedAs soon as the degree was raised, the air patterns appeared.

(6) Countermeasures

An arc shape is made on the original water inlet of the diversion channel (the front end of the glue inlet) and connected to the water inlet flow channel, which can buffer the injectionThe speed of the shot has a temporary storage space for the excess flow and can also divert the flow velocity, which is equivalent to reducing the speed invisibly and improving itIt eliminates the air wrinkles, but actually achieves the required speed, while injecting full products and avoiding insufficient glue and shrinkage.

Commodity Mould_Taizhou Jiefeng Mould Co.,Ltd. (jfmoulds.com)

The water outlet of the mold battery frame is scratched

Cause: It is caused by the small spout sticking to the front mold.

Characteristics of injection molding machines

Grade: Haitian, Clamping force: 140t, Plasticizing capacity :133g

(2) Mold characteristics

Mold ejection number: 1×2, glue injection method: direct injection, ejection method: push plate ejection, mold temperature :65° C (constant temperature machine)

(3) Product characteristics

Material: ABS PC, Color: Black, product weight (single piece) :3g, nozzle weight: 6g

(4) Analysis of causes of defects

1. The small spout adheres to the front mold and cannot run in the same direction as the product. After the mold is opened, the small spout adheres to the front mold while the product is at the back

The two molds are pulled in opposite directions, causing scratches at the water outlet.

2. The glue entry point of this water outlet is too large, and the pulling force of the water outlet pin is less than the pulling force of the glue entry point, resulting in the water outlet sticking to the front mold.

(5) Countermeasures

Increase the clamping position of the cold material pin to enhance the tensile force, so that the small spout can be smoothly adhered to the product in the rear mold after mold openingWhen ejecting, the product water outlet can be ejected simultaneously.