What Are the Differences Between Single-Stage and Two-Stage Solutions?

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There are different kinds of blow molding tools used to make Pet Bottle Mold for Single Stage and two-stage. Because of this, producers need to figure out which injection stretch blow molding process to use when making plastic bottles.

If you choose the correct method, you can increase efficiency, cut costs, and reduce the number of rounds needed to make these materials. However, you have to make a choice between Pet Bottle Mold for Single Stage and two-stage molding processes because they are very different.

What is a single-stage blow molding process?

Single Stage Molds method is called that because the preforms are made, stretched, and blown on a similar machine before they are cooled.

So, you could also say that PET blows molding tools with only one stage using a straight method.

Because the injection molding system and blow molding station are built into the same machine, they can do so much.

In the same way, the machine can have either 3 or 4 stations.

A machine with one stage and three stations has three phases: injection, stretch blow, and release. Also, it uses latent heat, which saves money because it doesn’t have to be reheated. As a result, 25% less heat is used in the machining.

What are blow molding machines?

Blow molding machines are tools used to make bottles out of plastic and glass.

It uses a few different methods to assemble tiny plastic parts for a bottle.

To make this happen, there are three main things that happen:

  1. Stretch blow molding with injection
  2. Blow molding with injection
  3. Blow molding extrusion

Even though each of these will result in a bottle, injection stretch blow molding is the only way to make PET or plastic bottles.

Process hygiene: the difference between single stage and two-stage methods 

The cleanliness throughout the process is very different for single-stage and two-stage systems. The first ones are made to do the whole injection and blowing ISBM process in a single cycle using a Single Stage Molds machine.

The extruder injects the melted substance into the injection mold to shape the preform. The preform is then partially cooled and moved through a conditioning station to improve the thermal profile in the sub-neck above all. It is then placed inside a blow mold, giving it its final shape.

The preforms and bottles never leave the cabin; therefore, the atmosphere is naturally clean with low contamination risk. 

For two-stage systems, where different machines work together, the process is different: an injection press makes the preforms, leaving the device cooled and then moving to another machine, which opens the bottle.

Advantages of single-stage blow molding process

The benefits of a single-stage ADS molds process include the following:

  • It is compact and versatile
  • It produces flawless vessels
  • The transferring of the mold is voluntary
  • Management of preform manufacture
  • More appropriate for modest volumes
  • Less expensive than machines with two stages.
  • Control over the thread begins to align with the bottle’s form.
  • Suitable for creating non-circular and rectangular shapes

Advantages of the two-stage blow molding process

Among the benefits of the two-stage molding procedure are:

  • Flexibility
  • Fast cycle periods
  • Fast transitions
  • Fewer constraints on container design. 
  • The policy can be terminated at any time.
  • Excellent wall distribution for spherical flasks


Since you are familiar with single-stage and two-stage blow molding devices, your decision will rely on your priorities. Further, for a better understanding, you must contact ACME.

Do you want a flawless container with a precise oval shape, a fixed thread, and a low initial investment? Then the single-stage ADS molds option is preferable.

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