Who would have thought! The toothpaste you squeeze every day comes in packaging that’s actually made of laminated film.

Preface 

Every day when you squeeze toothpaste, you may never have noticed that this soft, easy-to-squeeze, and tightly sealed toothpaste tube isn't made of a single type of plastic or metal—it's actually composed of multiple layers of composite film. “ Membrane structure complex ”。

Many people wonder: Why use a composite film for a toothpaste tube? Actually, this isn't just about showing off advanced technology—it's about the properties of the film material, the toothpaste formula, and the intended usage scenario. “ Optimal solution ”。

From the perspective of the membrane industry, this article dissects the structure, core advantages, and type differences of toothpaste composite membranes. It strikes a balance between popular science and technical expertise, offering practical insights that are easy to understand and suitable for both colleagues in the membrane industry and general readers. 

I. First, let’s clarify: the toothpaste packaging. “ The Truth About Composite Membranes ”，90% Everyone got it wrong. 

Misconception corrected: The core material of modern toothpaste tubes is a multi-layer composite film; high-end models feature an aluminum foil layer—but essentially, it’s still... “ Membrane + Aluminum ” The compound structure. 

Key conclusion: Toothpaste tubes are composed of multilayer functional films; a single-layer film cannot meet all packaging requirements. 

2 A key knowledge point: 

• Use regular, affordable toothpaste more often. “ All-plastic composite film ” , mid-to-high-end functional toothpastes are widely used. “ Aluminum-plastic composite film ” The key difference lies in whether or not there is an aluminum foil barrier layer. 
• Composite films are created by bonding multiple layers through specialized processes such as dry lamination and co-extrusion, achieving a synergistic combination of functions rather than merely being glued together. A typical white toothpaste tube consists of at least... 3 It is composed of layered membranes that respectively serve the functions of contacting the paste, locking in ingredients, and protecting the appearance—this is also the key to its soft and sealing performance. 

II. Disassembling the toothpaste composite film “ Hierarchical structure ” Each layer plays a significant role. 

The number of layers in toothpaste composite films is typically... 3-5 Layer, the core structure is largely similar, according to... “ From the inside out ” Disassemble as follows: 

(1) Core Layer: 3 Basic Layer (mainstream, affordable toothpaste) 

Structure: Inner membrane (contact layer) → Middle membrane (barrier layer) → Outer layer (protective printing layer)—moderate cost, well-suited to meet mainstream consumer needs. 

1.   Inner layer (contact layer): Directly contacts the paste; its core features safety, compatibility, and easy extrusion. 
        

• Common membrane materials: PE ( LDPE/LLDPE ), thickness 30-50 μm ；
• Core features: Meets food-grade standards and does not react with the paste; highly flexible and easy to squeeze; strong heat-sealing properties to prevent paste leakage. 

2.   Middle-layer membrane (barrier layer): The core function is to lock in moisture, seal in flavor, and prevent spoilage. 
        

• Common membrane materials: EVOH/PA The affordable version is available. PE Thickened, thickness 15-30 μm ；
• Core functions: Prevent moisture from drying out the paste, block oxygen to prevent ingredient oxidation and bacterial growth, and inhibit odor volatilization and the penetration of unwanted smells. 

3.   Outer layer (protective printing layer): The core functions are protection, aesthetics, and easy identification. 
        

• Common membrane materials: PET/PP , thickness 12-25 μm ；
• Core functions: Enhances stiffness and abrasion resistance; suitable for printing, with clear patterns that are resistant to fading; stain-resistant and easy to clean. 

(2) Hierarchical Upgrade: 4-5 High-end line (mid-to-high-end functional toothpaste) 

Structure: inner layer PE→ Bonding layer → Aluminum foil layer → Bonding layer → Outer layer PET (Aluminum-plastic composite film), suitable for high-barrier applications. 

1.   Aluminum foil layer: thickness 12-20 μm Improved barrier effect 10 More than double, extending the shelf life to 3 Year: Toothpaste formulated to be compatible with oxidation-prone ingredients; 

2.   Bonding layer: Use PU Adhesive, thickness 5-10 μm Bond the layers of film together, ensuring they are non-toxic and impermeable. 

Additional note: Some high-end models feature an antibacterial layer with a bacteriostatic rate exceeding. 99% , enhance hygiene. 

(3) Key to membrane material selection: Why these membranes—and not others? 

Core principles: safety compatibility, functional adaptation, and cost control. The core selection logic for membrane companies is as follows: 

1.   Don't select the inner layer. PET/PP： PET Hard, PP Poor heat-sealing performance often leads to paste adhesion and difficulty in extrusion. 

2.   Do not select a single barrier layer. PE Very poor barrier properties, easily leading to the paste drying out and deteriorating; 

3.   Do not select the outer layer. PE Poor print compatibility, patterns easily fade, and it fails to meet brand promotion requirements. 

III. Key Answer: Why must toothpaste packaging use composite films? 

The core reason: A single-layer membrane and pure aluminum tubing cannot simultaneously meet multiple requirements. The complementary functional advantages of composite membranes are irreplaceable, as detailed below: 4 Point: 

(1) Demand 1 Safety first—must be compatible with toothpaste paste (the core prerequisite). 

Toothpaste paste is an acid-base mixed system containing multiple ingredients. The packaging film must meet the following requirements: non-toxic and harmless, and neither adsorbing nor permeable. 

1.   Inner layer PE Chemically stable, compliant with food-grade standards, and does not react with the paste. 

2.   The composite membrane features layered division of labor, thereby avoiding the issues of single-layer membranes adsorbing fragrances and permeating harmful substances. 

Misconception of Comparison: Single Layer PVC Membranes release toxic substances, and pure aluminum tubes are easily corroded by acidic pastes; both have gradually been replaced by composite membranes. 

(2) Demand 2 Locks in the active ingredients of the paste and extends shelf life (core function). 

Toothpaste shelf life 2-3 Year, usable after Kaifeng is opened. 3-6 For months, the high barrier properties of the composite film have been crucial—single-layer films cannot simultaneously achieve water resistance, oxygen resistance, and odor resistance. 

From the perspective of the membrane industry: The barrier properties of composite membranes are superior to those of single-layer membranes. 5-10 Doubling the precision control of barrier layer parameters is the core competitiveness of membrane companies. 

(3) Demand 3 Easy to squeeze and convenient to use, perfectly suited for everyday scenarios. 

1.   Good flexibility, easy to squeeze; the paste can be extruded cleanly without any waste. 

2.   Inner layer PE Strong heat-sealing performance enables seamless sealing, preventing leaks. PET (Which a single-layer membrane cannot achieve); 

3.   Outer layer PET/PP Enhances stiffness and resilience; recovers after compression, making it easy to store. 

(4) Demand 4 Cost-controllable, balancing brand aesthetics with scalable production. 

1.   The membrane materials and composite processes are well-established, enabling scalable production and reducing packaging costs for toothpaste companies. 

2.   Outer layer PET/PP Suitable for printing, helping to promote your brand and enhance product quality; 

3.   Customizable in terms of layer count and membrane material, catering to various needs—from budget-friendly models to high-end ones. 

IV. Extension: The Composite Film of Toothpaste 2 The mainstream types—differences are immediately obvious. 

Toothpaste composite films are mainly divided into all-plastic composite films and aluminum-plastic composite films. The differences are as follows: 

All-plastic composite film: The mainstream choice for affordable toothpaste, with a structure of... PE → EVOH/PA → PET/PP without an aluminum foil layer. Its advantages include low cost, easy recyclability, excellent printability, and sufficient basic barrier performance, with a shelf life of approximately... 2 Year (e.g., Black people, affordable Yunnan Baiyao products); the disadvantage is poorer barrier properties and incompatibility with easily oxidized ingredients. 

Aluminum-plastic composite film: Specifically designed for mid-to-high-end toothpaste, with an aluminum foil layer in its structure. Its key advantage is its exceptional barrier properties, which extend the product’s shelf life to— 3 In recent years, it has been adapted for oxidation-sensitive ingredients (such as Colgate and Shiseido’s premium lines); its drawbacks include high costs and difficulty in recycling. 

Membrane Industry Supplement: Biodegradable Composite Membrane ( PLA/PBAT The substrate has been gradually piloted. 180 Compost degradation rate > 90% is the future trend in environmental protection. 

V. Perspective from the Membrane Industry: Core Technologies and Development Trends of Toothpaste Composite Membranes 

Toothpaste composite films represent a niche, high-demand market within the broader composite film segment. The core technologies focus on advanced composite processes and barrier performance, with emerging trends leaning toward environmental friendliness, lightweight designs, and functional enhancements. 

(1) Core Composite Process 2 Mainstream species) 

1.   Dry lamination: a mainstream process with high bonding strength and broad compatibility, ideal for producing aluminum-plastic composite films. 

2.   Co-extrusion compounding: No adhesives used, environmentally friendly and low-cost, suitable for the production of all-plastic composite films with a limited number of layers. 

(2) Core Quality Requirements (A Must-Read for Membrane Companies) 

Fit closely QB/T 2901-2012 Standards and core requirements: Adhesion strength meets specifications, no leakage, burst strength is qualified, and compliance with food-grade safety standards is ensured. 

(3) Development Trends ( 3 Broad direction) 

1.   Environmental friendliness: Biodegradable, single-material recyclable composite films are becoming mainstream, reducing pollution. 

2.   Lightweight: Reducing the thickness of film materials while balancing functionality, cost, and environmental friendliness. 

3.   Functionalization: Added antibacterial and anti-counterfeiting features to enhance practicality and brand protection. 

Conclusion 

A tube of toothpaste holds the wisdom of composite technology in the membrane industry. Its softness, sealing performance, and safety all rely on the synergistic effect of multi-layer composite membranes. 

Composite films have long been integrated into daily life, and toothpaste packaging is a prime example of their complementary functions and scene-specific adaptability. 

For colleagues in the membrane industry, understanding its structure and trends will enable them to better connect with downstream customers and enhance their competitiveness. For general readers, gaining insight into the truth behind it will help them better assess packaging safety. 

In the future, as membrane technology advances, composite toothpaste films will become more environmentally friendly and efficient, accommodating greater technological innovation and temperature resilience.