Plastic Tube vs Aluminum Tube: Which Sealing Method Is Better?

Introduction

Tube packaging shows up everywhere — cosmetics, pharmaceuticals, food, chemicals. Easy to dispense from. Protects what's inside. Looks decent on a shelf.

But picking a tube material is just the starting point. What happens after filling — the sealing step — is what actually determines several things:

• Whether the product leaks
• How long it stays usable
• How the finished package looks
• How fast the line can run

Plastic and aluminum tubes aren't built the same way, so naturally, they don't seal the same way either.

Manufacturers shopping for a Tube Filling Sealing Machine need to understand this distinction first. Get it wrong, and the equipment configuration follows suit.

1. Plastic Tubes: Flexible Packaging for Modern Products

Plastic tubes turn up in more everyday products than almost any other packaging format.

Common materials:

• PE Tube (Polyethylene)
• HDPE Tube (High-Density Polyethylene)
• Laminated Plastic Tube

Typical applications include cosmetic cream, facial cleanser, hand cream, sunscreen, toothpaste, and food sauce.

Advantages of Plastic Tubes

Lightweight and flexible. These tubes squeeze easily — a real plus for products people reach for daily. Body lotion. Shampoo. Skincare cream. All good fits.

More room for design. Different colors, custom printing, unusual shapes — plastic accommodates all of it. That's partly why cosmetic brands lean toward it; branding matters, and plastic bends to fit.

Built for speed. Automatic filling lines like plastic tubes because they load, position, fill, and seal continuously, without much fuss.

2. Plastic Tube Sealing Methods

Plastic tubes typically rely on thermal sealing.

Hot Air Sealing

One of the most common approaches for plastic and laminated tubes. The sequence runs like this:

Tube Heating → Material Softening → Tube Tail Pressing → Sealed Package

What it offers:

• A clean seal line
• Works across different tube materials
• No direct-contact heating element
• Parameters are easy to adjust

Common in cosmetics, personal care, and toothpaste production.

Ultrasonic Sealing

Here, high-frequency vibration generates heat between the tube layers — no external heat source involved.

Benefits worth noting:

• Skips the heating element entirely
• Gentler on sensitive materials
• Seals quickly

Used often in pharmaceutical packaging and premium cosmetics.

3. Aluminum Tubes: Strong Protection for Sensitive Products

Aluminum tubes have a long track record in pharma and industrial settings — decades, really.

Made from aluminum alloy. Common uses: pharmaceutical ointment, medical cream, adhesive, industrial paste.

Advantages of Aluminum Tubes

Excellent barrier protection. Aluminum blocks oxygen, light, and moisture effectively. For products needing a longer shelf life, that matters a great deal.

Strong chemical resistance. When a product needs extra protection from environmental exposure — pharmaceutical ointments, specialty chemicals — aluminum tends to be the pick.

Holds its shape after squeezing. Once deformed, the tube stays that way, which helps keep air from creeping back in.

4. Aluminum Tube Sealing Method: Crimping

Plastic gets heat-sealed. Aluminum gets folded and crimped instead — a mechanical process, not a thermal one.

The sequence:

Tube Filling → Tube Tail Folding → Crimping → Sealed Tube

Advantages of Aluminum Crimping

• A strong mechanical seal
• Well suited to pharmaceutical products
• Solid resistance to leakage

Seal appearance can vary too — double fold, triple fold, or custom crimp patterns, depending on what the product calls for.

5. Plastic Tube vs Aluminum Tube: Key Comparison

6. How Tube Material Affects Tube Filling Machine Selection

Tube material drives machine configuration — there's no way around it.

Manufacturers need to confirm a few things upfront.

Tube type. Plastic, laminated, or aluminum.

Sealing technology. Plastic tubes generally call for a hot air or ultrasonic sealing system. Aluminum tubes need a crimping system instead.

Product characteristics. The product itself shapes the decision too. Cosmetic cream usually pairs with plastic tubes and hot air sealing. Pharmaceutical ointment often goes with aluminum and crimping. Food paste tends to land on plastic or laminated tubes with heat sealing.

7. Common Sealing Problems and How to Avoid Them

Even with the right tube material chosen, poor settings can still cause trouble.

Leakage after sealing. Usually traced to incorrect temperature, insufficient pressure, or product contamination at the seal line. Fixes: adjust sealing parameters, tighten up filling accuracy, switch to anti-drip nozzles.

Uneven sealing appearance. Often comes down to tube positioning or mechanical misalignment. Tube orientation systems help. So does improving positioning accuracy overall.

Tube deformation. Typically caused by excessive heat or wrong pressure settings. The fix is straightforward — optimize sealing parameters to match the tube material being used.

8. Choosing the Right Tube Filling Sealing Machine

A few things worth evaluating before buying:

Product application — cosmetic cream, toothpaste, ointment, food paste, adhesive.

Tube material — plastic, laminated, or aluminum.

Sealing requirements — leakage resistance, appearance, shelf life, production speed.

Automation level. A semi-automatic tube filling machine suits smaller runs or product testing. An automatic tube filling sealing machine fits large-scale, continuous manufacturing better.

Why Choose ZONESUN?

ZONESUN builds Tube Filling Sealing Machine solutions around the product, the tube material, and the production requirements — not a one-size-fits-all setup.

Equipment can be configured with hot air sealing, ultrasonic sealing, aluminum tube crimping, servo filling systems, and automatic tube orientation.

Industries served include cosmetics, pharmaceuticals, food, and chemicals.

The goal, essentially: match the right filling and sealing technology to each product, so manufacturers get packaging that holds up and looks right.

Explore How to Choose the Right Squeezable Tube Filling Sealing Machine for Your Product?

Conclusion

Plastic and aluminum tubes each bring something different to the table. Neither works for every product — that much is clear.

Plastic tends to win out for cosmetics, personal care, and food, thanks to its flexibility and design range. Aluminum holds its ground in pharmaceutical and industrial settings, where barrier protection and crimp sealing matter more than looks.

What's the right choice, then? It comes down to the product itself, the tube material, the sealing requirements, and where production is headed.

Get the Tube Filling Sealing Machine and sealing technology right, and leak-free, well-finished packaging tends to follow.