Reasons and solutions for the frequent breakage of mainstream water outlets in plastic products

The sprue sleeve, also known as the main sprue liner or nozzle, is a channel for molten plastic to enter the mold cavity, connecting the injection molding machine and the mold The sprue sleeve and the injection nozzle of the injection machine are in the same central position

The material head inside the sprue sleeve is broken and difficult to remove

In terms of molds

first,The small end inner hole of the sprue sleeve is deformed

Reason: Due to the frequent impact of the nozzle on the curved surface of the sprue sleeve, the small port is concave and prone to buckling

Countermeasure: Use a conical steel file to trim the small port mouth

second,The conical inner hole of the sprue sleeve has a reverse buckle

Reason one: Sometimes due to human factors, the inner wall of the conical inner hole may be damaged when removing the material head, resulting in a reverse buckle

Countermeasure one: Use a conical steel file to trim the inner hole and polish it with sandpaper or replace it with a new sprue sleeve

Reason two: After the material ejector pin breaks or deforms, it hits the inner wall of the conical inner hole, causing it to snap back

Countermeasure two: Trim the inner hole with a conical steel file and polish it with sandpaper or replace it with a new sprue sleeve

Reason three: There are material attachments or foreign objects on the inner wall of the conical inner hole

Countermeasure three: Clean the inner wall of the conical inner hole of the sprue sleeve and polish it

third,The smoothness of the conical inner hole of the sprue sleeve is insufficient

Reason: Organic processing marks on the conical inner hole have not been polished properly or have been eroded by materials or gas corrosion

Countermeasure: Use a conical steel file to trim the inner hole and polish it with sandpaper or replace it with a new sprue sleeve

fourth,The large end of the sprue sleeve is deformed

对策：用锥形金钢锉对大端口部进行修整并用砂纸抛光或更换新的浇口套.

fifth,The conical inner hole of the sprue sleeve has cracked

Countermeasure: Replace with a new sprue sleeve

sixth,The sprue sleeve does not match the curved surface of the nozzle

Reason: Due to the mismatch of the curved surface, material leakage occurred, resulting in resistance

Countermeasure: Replace with a new sprue sleeve

seventh,The sprue sleeve or nozzle arc surface is damaged

Reason: Due to damage to the curved surface causing misalignment, material leakage occurs, resulting in resistance

Countermeasure: Replace the sprue sleeve or nozzle with a new one

eighth,The sprue sleeve and nozzle have different centers

Reason: Due to lack of concentricity, the center of the material head is misaligned, resulting in resistance

Countermeasure one: Adjust the position of the shooting seat up and down, left and right, and keep them in the same center position

Countermeasure two: The clearance between the fixed gate sleeve hole of the mother template and the outer diameter of the gate sleeve is too large. The size of the fixed gate sleeve hole of the mother template should be controlled within 0.1mm

ninth, The inner hole of the small end of the sprue sleeve is smaller than the nozzle hole

Reason: Because the nozzle hole must be 0.5 to 1.0mm smaller than the inner hole of the small end of the sprue sleeve. Otherwise, resistance will be generated during demolding

Reason: Because the nozzle hole must be 0.5 to 1.0mm smaller than the inner hole of the small end of the sprue sleeve. Otherwise, resistance will be generated during demolding

tenth,There is a gap between the outer diameter of the sprue sleeve and the mating hole with the mother mold

Reason: Due to gaps, burrs are generated, which create resistance

Countermeasure: If the sprue sleeve is worn, replace it with a new sprue sleeve or weld the worn part of the sprue sleeve before reassembling

If the inner hole of the mother mold core is worn out, it should be enlarged again and equipped with a new large sprue sleeve, or an insert that matches the sprue sleeve should be machined on the mother mold core

eleventh,The male mold pulled the material and sold it out

Reason: The material pulling pin has the function of pulling and pushing out the material head, and is often subjected to frequent force, which can easily lead to breakage

Countermeasure: Remake a new pull pin and replace it

twelfth, The pulling force of the male mold material sales is insufficient

Reason: When the force of the material pulling pin is insufficient to pull the main gate material head

Countermeasure one: Increase the angle of the material pulling pin and replace it with a new one

Countermeasure two: Process a narrow groove on the male mold core (above the top pin) to hold the main gate material head

Machine aspect

first,Reason: Insufficient cooling time of the product

Countermeasure: Extend the cooling time

second,Reason: Abnormal heating of the heating coil of the nozzle

Countermeasure one: Check if the heating coil wire ends are loose, and if they are loose, fix them again

Countermeasure two: If the heating coil does not heat up, replace it

In addition, incorrect material selection is also a reason for poor material head detachment