The Injection Molding Machines

The Morgan-Presses are versatile injection molding machines designed to reduce the costs of production.  Its unique design was especially developed to make injection molding of plastic molded parts practical and economical in the quantities required for rapid prototyping and low-volume production.  This makes it ideal for model shops,medical device manufacturers, R & D labs, and many other plastic injection molding applications that require short-run production needs.

Features on all Morgan’s injection molding machines:

  • Solid State Temperature Controllers – featuring digital set-point and readout, 3-mode proportioning and programmable controls, 0-800°F/0-430°C 1/8 DIN modular units.
  • Injection Speed Control – for adjusting injection speeds slower and faster where cavity fill rates are critical
  • Heavy duty cast aluminum construction
  • Hardened and chrome-plated barrels (material melt cylinders)
  • Precision ground chrome-plated stanchion rods
  • Generous 8″x11″ (maximum) mold plan area

Theory of injection molding


The theory of injection molding can be reduced to four simple individual steps: Plasticizing, Injection, Chilling, and Ejection. Each of those steps is distinct from the others and correct control of each is essential to the success of the total process.

Plasticizing – describes the conversion of the polymer material from its normal hard granular form at room temperatures, to the liquid consistency necessary for injection at its correct melt temperature.
Injection – is the stage during which this melt is introduced into a mold to completely fill a cavity or cavities.
Chilling – is the action of removing heat from the melt to convert it from a liquid consistency back to its original rigid state. As the material cools, it also shrinks.
Ejection – is the removal of the cooled, molded part from the mold cavity and from any cores or inserts.
Repetition of these basic steps in sequence is the process of injection molding.

The practice of injection molding
The practice of injection molding varies from the theory, only in as much as process limitations and available equipment affect it. Step by step process is explained in ST’s Cutting Costs in Short-run Plastic Injection Molding guide.

injection mold parts issue solution

injection mold parts issue solution

It is a headache to run into the problem of product mucosal in injection mold  parts, it not only requires a lot of manpower and material resources to take product out from the mold, but also affected the company’s production efficiency, increasing cost to the company.

But how can we solve the problem of injection mold products mucosa?

At first, we should find out the reason of mucosal. As follows:

1.Bad polishing , for example, it is stick before the mold, May be because after the die polishing better than the previous die polishing   Die tryout mold in the production process directly stick in the former mould.

2. Draw taper design may be unreasonable. In theory, front mould draw taper   is larger than rear mould draw taper. Putting the draw taper in wrong side may also result to product sticking in the former mould.

3. The exits of a vacuum lead to product binding on the front mould.  It is a common phenomenon to the Shell, box products.
4. Bad polishing may lead to the rear mould mucosa.mold manufacturing in China

5. Mold temperature is too low at the beginning, the product hold too much power to the product.

So we have understanding the reason of mucosal in the test mould, our suggestion of the problem as follows:

1,We must pay more attention to the front mould, the front mould’s polishing should be better than rear mould.

2, For the box, shell and other products, if there is vacuum in front mould, we should use exhaust pin to eliminate the influence of vacuum, but sometimes rear mould need exhaust pin too.

3, If product structure asking for the mould the temperature, we should increase the temperature when testing mould.

4, We can set reasonable injection parameter according to the characteristic of the plastic raw materials, then reducing the possibility of plastic product’ mould sticking.

Go to our injection mold china company via https://www.plasticmold.net/ to know more solutions