Material Structure and Thickness of Spouted Pouches

What is a spouted pouch?

A spouted pouch is a type of flexible packaging equipped with an integrated spout or nozzle for easy pouring or dispensing of contents. Essentially, it is a pouch with a built-in valve or cap that controls pouring, allows resealing, and maintains the freshness of the internal product.

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Main features of spouted pouch:

Combines a flexible pouch structure with a spout or resealable cap.

Made from multilayer plastic films with barrier properties to preserve product freshness.

Commonly used for liquids, semi-liquids, powders, and granules, such as juices, sauces, baby food, health supplements, and cleaning liquids.

Easy to pour and reseal, lightweight and portable, more cost-effective than rigid containers, convenient for single or multiple uses.

What does the material structure of spouted pouch refer to?

Spouted pouch belong to the flexible packaging product category (i.e., flexible pouch) and, like other flexible packaging products, are made by laminating different types of plastic films. The material structure is one of the three main elements used for pricing spouted pouch.

What common material structure combinations are used for spouted pouch? What are their advantages and disadvantages?

Simply put, the material structure of spouted pouch consists of three layers: “printing layer,” “barrier layer,” and “contact layer.” Although spouted pouch can be formed by combining various plastic films, these layers cannot be combined arbitrarily. The following are common material structures proven effective for spouted pouch through years of practical experience.

PET/PE

Advantages: Suitable for fast-moving consumer goods; the cheapest spouted pouch to produce with this structure.
Disadvantages: Lacks a barrier layer, so unsuitable for packaging items sensitive to oxygen, moisture, or sunlight; cannot undergo pasteurization at 90°C after filling; finished pouches over 200g or ml have a high rate of leakage.

PET/PET/PE

Advantages: Moderate barrier against oxygen and moisture; inexpensive packaging option.
Disadvantages: The barrier layer is PET, which does not block sunlight; poor compression resistance when filled with over 1000g or ml.

PET/VMPET/PE

Advantages: Strong sunlight reflection due to added metallized coating; superior barrier against oxygen and moisture compared to PET/PET/PE.
Disadvantages: Compression resistance issues like PET/PET/PE for pouch sizes above 1000g or ml.

PET/NY/PE

Advantages: Excellent compression resistance.
Disadvantages: Does not block sunlight; for products under 300g or ml, the pouch body tends to be soft.

PET/AL/NY/PE

Advantages: Best barrier properties against oxygen and moisture, strong compression resistance, and sunlight reflection; suitable for products of any fill volume.
Disadvantages: Relatively expensive.

PET/AL/NY/RCPP

Advantages: Suitable for 121°C sterilization; offers best barrier performance against oxygen and moisture, strong compression resistance, and sunlight reflection; suitable for any volume.
Disadvantages: Relatively expensive.

PET/NY/RCPP

Advantages: Suitable for products requiring sterilization at 121°C.
Disadvantages: Does not block sunlight; pouch body may be soft when filled under 300g or ml.

What does the thickness of the material structure in spouted pouch refer to?

It refers to the total thickness of the “printing layer,” “barrier layer,” and “contact layer” on one side of the pouch. Thickness is measured with calipers at the midsection of the pouch, offset slightly left or right, then divided by two. For example, if the measured value is 248 microns, divided by two equals 124 microns; the net thickness should be considered 120 microns because about 4 microns accounts for adhesive and solvent residue between layers and is excluded from the calculation.ls, as authentic endorsements from satisfied customers, serve as potent social proof, significantly inspiring trust in potential consumers.

How is the thickness of spouted pouch material structures determined?

Generally, thickness follows certain standard ranges but is not fixed. It requires adjustment based on the characteristics of the filled product and specific customer requirements:

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60ml-100ml

80-100 microns  

150ml-250ml

105-120 microns

300ml-500ml

125-130 microns  

600ml-1000ml

135-140 microns

1500ml-2000ml

150-160 microns  

2500ml-3000ml

170-180 microns

3500ml-4000ml

190-200 microns

4500ml-5000ml

210-220 microns