What is the reason for the rubber wire pulling of PET hot runner glue point products?

In this case, the temperature is not well controlled, and in this case, it is likely that the temperature is too high.

1) Since sprues and runners are not formed, there is no need to utilize them.

2) Short-cycle molding is sometimes possible.

3) In some cases, it can reduce the dimensional deviation in the case of multi-cavity molding.

4) Reduce waste and improve product quality.

During the hot runner mold forming process, the melt temperature of the plastic melt is precisely controlled in the runner system. Plastic can flow into the cavities in a more uniform state, resulting in a part of consistent quality. The part gate formed by the hot runner has low residual stress and small deformation of the part after demoulding.

Therefore, many high-quality products on the market are produced by hot runner molds. For example, many plastic parts in familiar Motorola mobile phones, HP printers, and Dell laptops are made of hot runner molds.

There are three types of hot runners, manifolds, nozzles, and temperature control boxes. You can take a look at the drawings I put on, the main gate feeds, flows through the nozzle through the manifold, and the temperature control box Arnold is temperature controlled.

A hot runner mold is a mold that uses a heating device to make the melt in the runner never solidify. Because it has a shorter forming cycle than traditional molds and saves raw materials, hot runner molds are widely used in various industrially developed countries and regions in the world today.

Not polished well? Low temperature of plastic?

What is the material? The mold opening time is a little longer, the water is transported, and the runner is polished.

The relatively simple way to deal with this problem is to increase or decrease the temperature of the nozzle (usually within 10 degrees).

If it's a little more complicated, it is:

1. The mold and the nozzle are not aligned;

2. The mold gate is set into the glue port and collides with deformation;

3. The material itself belongs to the drawing material;

4. The cooling time is not enough, etc.

According to what you said, it should be glued into the gate gate, and the tip of the mouth should be too high!

Here's how to deal with it:

First, increase or decrease the temperature of the nozzle (generally within 10 degrees will take effect) Second, the mold and the nozzle are not aligned;

3. The mold gate is deformed into the glue port;

Fourth, the material itself belongs to the drawing material;

Fifth, the cooldown time is not enough.

The injection molding machine product rubber mouth drawing can be done as follows:

If the nozzle hole is smaller, the mold and the nozzle should be aligned.

Reduce the nozzle temperature, mold cooling temperature, cooling time should be sufficient.

Do not collide and deform the mold gate into the glue port, otherwise it will also be drawn.

The material itself is a brushed material.

Rubber wire is a serious injection molding defect, the pulled out rubber wire or stick to the surface of the product to form a waste product, or stick to the mold parting surface, which will affect the product quality at least and crush the mold at worst.

If it is a problem with the material itself, it can be prevented: the needle valve mold is used, the production process is used to retract the seat table in the production process and the self-locking nozzle is used.

If it is a matter of temperature: reduce the temperature at the nozzle or hot runner, generally by 10 to 10 degrees. Enable the function of screw release or increase the distance of the release push. This distance is generally 5-10mm.

In the production of mold hot runner products, what are the glue feeding methods of mold hot runner?

Hot runner glue feeding method one: "point gate", point gate method is the most common glue feeding method, it is determined by several factors such as gate size, gate cooling and mouth tip part temperature and other factors together determine the quality of injection molding products, it is suitable for almost all known plastics, its glue inlet will leave a small gate mark on the surface of the product, its size is determined by the gate size and different plastics.

Hot runner glue feeding method 2: "large nozzle", large nozzle nozzle is an open hot nozzle, there will be a small section of material handle left on the surface of the injection molded product, it can provide a large gate size, achieve excellent pressure holding effect to reduce product stress, can be applied to the gate mark is not high requirements or split runner glue feeding method.

Hot runner glue feeding method three: "needle valve type", for the needle valve type, the valve pin is controlled by mechanical pneumatics or hydraulics, and the valve pin will close the gate at the end of the pressure holding section, that is to say, when the product is not completely condensed, the glue feeding system has been closed, which can also shorten the forming cycle. The needle valve type can achieve no gate marks, leaving only one circle or no imprint on the surface of the product, which is the best solution for applications with strict surface requirements.

The valve pin, length, can be adjusted.

You can adjust the needle point of the hot runner.

When I first started using Sheffield, I didn't have a lot of hope. But day by day, now I'm fair-skinned, and my complexion is even, I think if it wasn't for the original decision, I wouldn't be where I am today, I'm really grateful to Xuefei.

1. Aperture at the intersection.

Cause: The temperature around the gate is too high.

Solution: Change the nozzle temperature and.

Or change the temperature of the gate cooling channel to achieve the optimum.

Temperature, right. In the case of PC, the gate area temperature is in.

is preferred, 90 for PMMA

degree is preferred; Detection during tryout:

Measure the actual temperature around the gate and adjust it in time to ensure stable production;

2. There are obvious gate marks on the surface of the product.

Causes: the valve pin is too short, the gate temperature is too low, the holding pressure is too large, or the injection time is too long or too long; Solution:

Detect the length of the valve pin and the fit with the bell mouth; Detect the distance between the nozzle core and the mold; increase the nozzle temperature and/or optimize the cooling channel temperature; In order to ensure that the appearance of the product is not shrinking.

water, on the basis of qualified dimensions, reduce the pressure value and time of holding pressure;

Detection during tryout:

When the above situation occurs during the mold tryout, the first step should be to check whether the valve pin completely protrudes from the mold; After the valve pin is closed, the cavity surface of the mold is protruded, and the front end is equipped with a curvature;

If the valve pin is positioned correctly, the problem may be due to packing pressure (too much pressure, or too much time) or too little pressure in the cylinder.

If the valve pin is behind the gate, it may be a mechanical problem (the valve pin is too short) or the temperature is not accurate, the gate temperature is too low, the gate cone is attached to a cold film, and the valve pin cannot reach the bottom, in this case, the gate must be heated with fire and the valve pin must be opened and closed manually.

If the valve pin is moving in the correct position, the valve pin length is appropriate, otherwise the valve pin length needs to be adjusted. When restarting the tryout, under the correct temperature conditions.

If the same problem occurs after several molds have been produced, it means that the size of the tapered part of the gate does not match the valve pin (there is a problem with the cone of the valve pin orifice and the taper of the glue mouth), and the cold film is formed, which causes flash. Due to the flash.

, the valve pin cannot reach the correct position. In this case, the mold needs to be removed and the mold is strictly matched. Use.

Once the hot air lance has cleared the gate cold film, the problem can be verified by the naked eye.

If the temperature in the gate area is too low: this can be solved by simply raising the temperature of the nozzle or mold.

Hello, what glue? What hot runner system?