Skip to main content

What do you know about the hot runner molds?


The structure of the hot runner mold is generally the same as that of the thin nozzle. The biggest difference is that the runner is located in one or more hot runner plates and hot nozzles with constant temperature. There is no cold material demoulding, the runner and gate are directly on the product.

Therefore, the runner does not need to be demolded. This system is also known as the nozzleless system, which can save raw materials. It is suitable for the product that the raw materials are expensive and the product requirements are high.

Hot runner system, also known as hot sprue system, is mainly composed of hot runner sleeve, hot runner plate and temperature control electric box. There are two types of hot runner system: single point hot sprue and multi-point hot sprue.

Single-point hot sprue is to use a single hot sprue sleeve to inject molten plastic into the cavity directly. It is suitable for plastic molds with single-cavity and single-gate; multi-point hot-gate is to branch the molten material to each through hot runner plate. It is suitable for single cavity multi-point feeding or multi-cavity mold.


Advantages of hot runner systems

1. No regrind material, no post-processing is needed, the entire molding process is fully automated, saving working time and improving work efficiency.

2. Low pressure loss. The hot runner temperature is same as the nozzle temperature of the injection molding machine, which avoids the condensation of the raw material on the surface of the runner and reduces the loss of injection pressure.

3. Reuse of regrind material can improve the degradation of plastic performance, while the use of hot runner system without nozzle materials can reduce the consumption of raw materials and thus reduce product costs.

4. In the cavity, the temperature and pressure are uniform, the plastic parts have low stress and uniform density, and the molding in series is continuous under a small injection pressure. For transparent parts, thin parts, large plastic parts or highly demanding plastic parts, it can show its advantages, and can produce bonded products with a small number of sheets.

5. The thermal nozzle adopts standardized and serialized design and adopts various alternative nozzle tips, which has good interchangeability. Uniquely designed and processed electric heating coil can achieve uniform heating temperature and replace long.

Disadvantages of Hot Runner System Applications

1. The overall mold closing height is increased, and the overall height of the mold has increased due to the installation of hot runner plates.

2. Heat radiation is difficult to control. The biggest problem of hot runner is the heat loss of runner, which is a major problem to be solved.

3. There is thermal expansion, thermal expansion and contraction are issues to be considered in our design.

4. The increase of mold manufacturing cost and the high price of standard accessories of the hot runner system have affected the popularity of hot runner molds.

From weizhushu


Grandshine is a vertically integrated plastic injection molding manufacturer. From product design to the manufacturing of complete plastic products,we are a one stop source for all your plastic contract manufacturing needs.Plastic injection molding for special project and OEM/ODM product solution are available.

www.grashine.com





Labels:

Comments

Post a Comment

Popular posts from this blog

5 Ways to help you remove the scratch from your mobile phone

Now everyone has a big screen smart phone,  but  if you do not buy a protective shell or cover , it is easy to   scratch  at the back rear  cover or the screen , even if  it was covered by  the whole wrap protective  case , there will inevitably be some scratches on the screen .  Here are some tips that you can DIY to  remove  scratch es on your phone , the effect is magical, have a  try ! 1, toothpaste Toothpaste can be used in many occasions to scratch, toothpaste contains solid calcium carbonate, silica and other ingredients have the effect of grinding, and because of the hardness and screen glass similar, often can have a good  effect on removing scratch. But don't use children's toothpaste to clean your phone screen. Just use regular toothpaste.First, squeeze a little bit of toothpaste on a cotton swab or a clean cloth, then paint a circle around the scratched area and wipe gently until the scratch is g...
Post a Comment
Read more

Let's stop plastic waste at its sources

  Around the world, one million plastic drinking bottles are purchased every minute, while up to 5 trillion single-use plastic bags are used worldwide every year. In total, half of all plastic produced is designed to be used only once — and then thrown away.While plastic has many valuable uses, we have become addicted to single-use or disposable plastic — with severe environmental consequences.  We have seen a lot of positive action to reduce the plastic waste such as: garbage sorting,limit the use of disposable plastic products and the developing and manufacturing of the recycling. But we need to do more, we need to stop the plastic pollution at its sources   100% Biodegradable material was tested is 100% compostable and  can be completely degraded into  carbon dioxide and Oxygen in the Under natural composting and home composting conditions . As a kind of natural degradable material, biodegradable material plays a unique role in environmental protection. Its r...
Post a Comment
Read more

A few tips to help you understand electric injection molding machines

According to the driving theory of the injection molding machine, the control system of the injection molding machine is composed of various circuits for processing power and controller to complete the movement and process actions The electric injection molding machine uses a servo motor to perform injection, plasticization, mold clamping, ejection, Therefore, it has high controllability and response characteristics ☆ Features of electric injection molding machine: -Since each action (injection, plasticization, melting, clamping and ejection) has independent servo motor drive, the electric injection molding machine consumes less energy than the hydraulically driven injection molding machine; -The use of cooling water to control the oil temperature is reduced because no hydraulic oil is used; -An oil-free environment is possible (no oil pollution); -Because there is no vibration problem in the hydraulic circuit of the traditional hydraulic system, low noise levels are...
Post a Comment
Read more