When using POF Shrink Film, achieving perfect packaging results depends on more than just selecting the right film.

Many packaging issues, such as loose shrinkage, wrinkles, poor appearance, or film damage, are related to incorrect shrink tunnel settings.

Unlike some packaging materials, POF Shrink Film does not require extremely high temperatures. Under normal conditions, most POF films achieve excellent shrink performance within a controlled temperature range.

This guide explains the recommended shrink temperature settings, key adjustment factors, and troubleshooting methods to help packaging users achieve stable and attractive results.

What Is the Recommended Shrink Temperature for POF Film?

For most standard POF Shrink Film applications, the recommended shrink tunnel temperature is generally:

115°C - 140°C

This range provides a good balance between:

• Film shrink performance

• Packaging appearance

• Production efficiency

• Product protection

However, the ideal temperature is not a fixed number. It should be adjusted according to the actual packaging conditions.

Factors That Affect POF Shrink Temperature Settings

1. Shrink Tunnel Design

The shrink tunnel is one of the most important factors affecting temperature requirements.

Different tunnels have different:

• Heating systems

• Air circulation designs

• Fan power

• Tunnel length

• Temperature control accuracy

A high-efficiency shrink tunnel may achieve excellent results at lower temperatures, while another machine may require slightly higher settings.

2. Conveyor Speed

The relationship between temperature and conveyor speed is critical.

Faster conveyor speed:

• Shorter heating time

• May require slightly higher temperature

Slower conveyor speed:

• Longer heating time

• May allow lower temperature settings

The goal is to achieve complete shrinkage without overheating the film.

3. Film Thickness

Film thickness has some influence, but it is not the main factor determining shrink temperature.

For example:

• 10μm-15μm POF film usually shrinks easily under normal settings.

• 19μm-30μm thicker films may require slightly higher temperature or longer heating time depending on the application.

The correct adjustment should always be based on actual packaging results.

4. Product Size and Shape

Different products require different heat conditions.

Large or irregular products may need:

• Higher airflow

• Longer heating time

• Proper tunnel adjustment

Small lightweight products usually shrink faster.

Recommended Starting Settings for POF Shrink Film

The following settings can be used as a starting reference:

Note: Actual settings should be optimized according to the specific shrink tunnel and packaging line.

How to Adjust Shrink Tunnel Temperature Correctly

Instead of setting the temperature too high immediately, we recommend adjusting gradually.

Step 1: Start With Medium Temperature

Begin around:

125°C - 130°C

and observe the shrink result.

Step 2: Check Packaging Appearance

A good shrink result should have:

• Smooth surface

• Tight packaging

• No wrinkles

• Clear appearance

• Strong seal

Step 3: Adjust Temperature or Speed

If shrinkage is insufficient:

Increase slightly:

• Temperature

• Heating time

• Airflow

If film shows:

• Shrink holes

• Excessive tension

• Surface damage

Reduce:

• Temperature

• Heating time

Common POF Shrink Film Problems and Solutions

Problem 1: Film Does Not Shrink Completely

Possible Reasons:

• Temperature too low

• Conveyor speed too fast

• Insufficient airflow

Solutions:

✔ Increase temperature slightly
✔ Reduce conveyor speed
✔ Check tunnel airflow

Problem 2: Wrinkles Appear After Shrinking

Possible Reasons:

• Uneven heating

• Incorrect tunnel airflow

• Improper film selection

Solutions:

✔ Adjust airflow direction
✔ Optimize tunnel temperature
✔ Check film specification

Problem 3: Film Has Burn Marks or Holes

Possible Reasons:

• Temperature too high

• Heating time too long

Solutions:

✔ Reduce temperature
✔ Increase conveyor speed

Problem 4: Poor Sealing Performance

Possible Reasons:

• Incorrect sealing settings

• Sealing blade problems

• Wrong film specification

Solutions:

✔ Check sealing temperature
✔ Maintain sealing system
✔ Confirm suitable POF film type

POF Shrink Film Temperature Tips for Different Applications

(Final settings depend on machine conditions.)

Why High-Quality POF Film Requires Less Adjustment

A stable POF Shrink Film should provide:

• Uniform thickness

• Consistent shrink performance

• Stable sealing

• Excellent clarity

• Reliable machine running

Poor-quality film may cause:

• Uneven shrinkage

• Frequent machine adjustments

• Higher packaging waste

Choosing a reliable POF manufacturer helps maintain stable production efficiency.

Conclusion

The correct POF Shrink Film shrink temperature depends on many factors, including shrink tunnel design, conveyor speed, airflow, product size, and film specifications.

In most applications, POF Shrink Film performs well within a temperature range of 115°C-140°C.

Instead of using a fixed temperature setting, packaging operators should adjust the shrink tunnel based on actual packaging results to achieve the best balance between shrink quality, production speed, and energy efficiency.

FAQ

What is the best temperature for POF shrink film?

Most POF Shrink Films work well between 115°C and 140°C, depending on the shrink tunnel and packaging conditions.

Does thicker POF film need higher temperature?

Not necessarily. Thickness has some influence, but machine conditions and airflow usually have a greater impact. Thicker films may require slight adjustment when needed.

Why does my POF film have wrinkles after shrinking?

Common reasons include improper temperature, incorrect conveyor speed, or uneven hot air circulation.

Can POF shrink film shrink at low temperatures?

Yes. Compared with some traditional shrink films, POF can achieve excellent shrink performance at relatively low temperatures.