How to solve the flow mark of the injection molding machine product gate and the flow mark of the in

Kejun Machinery (Toyo Injection Molding Machine, Sodick Injection Molding Machine, Fanuc Injection Molding Machine).

Injection molding machine.

1 Insufficient injection pressure and holding pressure.

The injection pressure and holding pressure are not enough to press the condensed skin against the die surface, leaving a sink mark of the melt in the flow direction.

By increasing the injection pressure and holding pressure, the condensate layer can be pressed on the die surface until the product is formed, and the flow marks are not generated.

2 Improper residence time.

The residence time of the plastic in the barrel is too short, and the melting temperature is low, even if the mold cavity is barely filled, the plastic cannot be compacted during pressure holding, leaving the shrinkage marks of the melt in the flow direction.

The shot-to-barrel ratio should be between 1 and 1 4.

3 Improper cycle time.

When the cycle time is too short, the plastic cannot be heated in the barrel, and the melting temperature is low, even if the mold cavity is barely filled, the plastic cannot be compacted during pressure holding, leaving the shrinkage marks of the melt in the flow direction.

The cycle time is extended until the plastic is fully melted, and the melting temperature is high enough to prevent the flow direction of the sink marks.

4 The barrel temperature is too low.

When the temperature of the barrel is too low, the melt temperature is low, and the injection pressure and holding pressure are not enough to press the condensed skin against the die surface, leaving a sink mark of the melt in the flow direction.

Increase the material temperature, injection pressure and holding pressure to press the condensate layer on the die surface until the product is finalized, and the flow mark is not generated. The setting of the material temperature can be based on the recommendations of the material manufacturer.

The material tube is divided into four zones: rear, center, front and nozzle, and the material temperature setting should be gradually increased from back to front, and the height should be increased by 6C for each previous zone.

If necessary, the nozzle zone and the front zone are sometimes set to the same temperature as the centre zone.

5 The nozzle temperature is too low.

The plastic absorbs the heat released by the heating bands and the friction heat caused by the relative movement of the plastic molecules caused by the rotation of the screw in the barrel, and the temperature gradually increases.

The last heating zone in the barrel is the nozzle, where the melt should reach the desired temperature, but it must be heated moderately to maintain optimal condition. If the nozzle temperature is not set high enough, because the nozzle and the mold are in contact, too much heat will be taken away, and the material temperature will drop, and the injection pressure and holding pressure will not be enough to press the condensed skin against the die surface, leaving a sink mark of melt in the flow direction.

Increase the nozzle temperature. Generally, the nozzle zone temperature is set 6C higher than the front zone temperature.

What raw materials are made? In general, flow marks are related to velocity.

1. For injection molding products with large flow length, the material with good fluidity must be selected, and the appropriate proportion of molding lubricant can be added to the material that does not meet the requirements to improve the fluidity of the material. Generally, the lubricant content is under 1%, and the lubricant content must be increased appropriately when the flow length is larger than the wallpaper thickness of the mold. 2. The injection pressure and holding time are insufficient, and the condensed epidermis is pressed on the mold surface, leaving the flow marks of the melt in the flow direction.

The solution can increase the injection pressure and extend the holding time, so that the condensate layer can be pressed against the surface of the mold until the plastic mold or similar cement mold is set. 3. The injection cycle is too short, and the heating temperature of the plastic is too low, which leads to flow marks, which can extend the injection cycle time, so that the traces of the flow direction can not be generated. 4. The temperature of the barrel is too low, the melt temperature is low, increase the material temperature, and the injection pressure and holding time will press the condensation layer on the mold surface until the plastic mold is finalized.

5. The temperature of the nozzle is too low, resulting in a drop in material temperature and flow marks, and the loss of the nozzle can be increased, which should be higher than the last setting of 6 degrees Celsius. <>

Kiss! Hello, happy to answer your <>

How to solve the flow mark of the pro-injection injection inlet is as follows: 1. Increase the gate width on the mold. 2。

Using the multi-stage injection process, the difficulty is to control the position at the slow speed at the inlet. 3。The use of mold temperature machine to maintain the mold temperature can be controlled at about 80 degrees, which is the visible material flow mark on the surface of the plastic parts in the mold cavity under the influence of injection pressure and material flow velocity.

The specific reasons are as follows: 1. The mold temperature and material temperature are too low 2. Note that the injection speed and pressure are too small 3. The runner and gate size are too small Solution: 1. Increase the mold temperature and material temperature during injection molding 2. Increase the injection pressure and holding pressure to prolong the holding time.

3. Increase the speed of injection, I hope I can help you <>

Do you have any other questions?

Kiss! Hello, happy to answer your <>

The pro-material flow mark is a visible material flow trace on the surface of the plastic part in the mold cavity under the influence of injection pressure and material flow velocity. The specific reasons are as follows: 1. The mold temperature and material temperature are too low 2. The injection speed and pressure are too small 3. The runner and gate size are too small Solution:

1. Increase the mold temperature and material temperature during injection molding 2. Increase the injection pressure and holding pressure to extend the holding time 3. Increase the injection speed The method of removing the flow marks at the inlet of the glue is as follows: 1. With a shovel.

If it is an overflow of swelling glue, you can use a sharp shovel to shovel it directly, taking care not to hurt the surrounding items. 2。With a hair dryer.

The glue left on the stickers on ordinary products can be heated and blown with a hair dryer for 5 minutes, and then rubbed off with a towel. 3。With wind oil essence.

Ordinary glue, you can also apply wind oil essence on it, and after a few minutes, scrub it off vigorously with a wet towel. 4。Use an oil-based facial cleanser.

Spread the cleanser on top of the gel, as much as possible, and after about 10 minutes, wipe off with a towel. If it has the same effect as a facial cleanser, it can also be used with hand and hand burner cream. 5。

with a high degree of alcohol. Soak the toilet paper in alcohol, cover it with glue, and wipe the wheel vigorously with a clean towel for 3 minutes. 6。

With the water of the sky. Use a towel to dip an appropriate amount of Tianna water and rub it vigorously in the area with glue until it is all cleaned. 7。

with an eraser. If it is the glue left on the smooth glass plane, you can directly wipe it with an eraser, and the effect is also very good. Hope mine can help you <>

Do you have any other questions?

Summary. Material flow marks are visible material flow marks on the surface of plastic parts in the mold cavity under the influence of injection pressure and material flow velocity. The specific reasons are as follows:

1. The mold temperature and material temperature are too low.

2. The injection speed and pressure are too small.

3. The size of the runner and gate is too small.

Solution: 1. Increase the mold temperature and material temperature during injection molding.

2. Increase the injection pressure and holding pressure to prolong the holding time.

3. Increase the injection speed.

4. Appropriately increase the size of runners and gates.

5. Shorten the size of the sprue and use the hot runner instead.

Material flow marks are visible material flow marks on the surface of plastic parts in the mold cavity under the influence of injection pressure and material flow velocity. The specific reasons are as follows: 1. The positive temperature of the mold hail and the material temperature are too low 2, the injection speed and pressure are too small 3, and the size of the runner and gate is too small to solve the square bending reed method

1. Increase the mold temperature and material temperature during injection molding 2. Increase the injection pressure and holding pressure to prolong the holding time. 3. Increase the injection speed 4, appropriately increase the size of the source runner and gate 5, shorten the size of the sprue and use the hot runner instead.

Hello! 1.It is often difficult to change the gate position for the part where the surface flow mark is generated.

Generally speaking, the gradual thinning method should be used for the parts with great wall thickness, and the arc angle of the filler should be increased for the corners, edges, grids and other parts that cause sudden shear changes, which can reduce the degree of high shear of the mold filling melt. 2.The reinforcing rib or the pre-sensitive of the boss and the wall mold of the product are poorly designed, and the diversion effect of the material flow of the regret section will also occur, resulting in the retention of the material flow of the wall thickness part, the size should be re-checked, and the reinforcing rib or the arc angle at the bottom of the column can reduce the retention degree of the mold filling material flow.

Flow marks refer to the groove lines with poor local fusion on the surface of plastic parts, such as common V-shaped, U-shaped, and W-shaped flow marks. Adjustment or not usually depends on the degree to which the flow marks affect the appearance of the product. Hope it helps.

Cavities with a large flowlength to thickness ratio must be filled with easy-flow plastic. If the fluidity of the plastic is not good enough, the melt will go slower and slower, and the slower and colder it will be, and the injection pressure and holding pressure will not be enough to press the condensed skin against the mold surface, leaving a shrinkage mark of the melt in the flow direction. Depending on the specific design, the material manufacturer can provide professional advice:

Under the principle of no spillage, the most flowing plastic is selected.

2.The use of molding lubricant is improper, and the general lubricant content is less than 1%. When the ratio of flow length to wall thickness is large, the lubricant content must be moderately increased to ensure that the condensation layer is close to the die surface until the product is finalized, and the flow marks are not generated.

Increasing the lubricant content must be agreed with the material manufacturer.

Insufficient venting will hinder the melt filling, and the condensed skin cannot be pressed against the die surface in the melt wavefront, leaving a sink mark in the flow direction. Exhaust gas is considered at the end of each flow channel to prevent gas from entering the cavity. Cavity exhaust should not be neglected.

It is best to use a full-circumference exhaust.