When choosing a composite stand-up pouch, you need to consider factors such as material, function, printing process, sealing performance and applicable scenarios. The following is a detailed purchase guide:
1. Material selection (key factors)
Composite stand-up pouches are usually made of multiple layers of materials. Different material combinations affect their barrier properties, durability and environmental protection:
PET/AL/PE (polyester/aluminum foil/polyethylene): high barrier properties (moisture-proof, anti-oxidation, light-proof), suitable for products that need long-term preservation such as coffee, nuts, and pet food. The aluminum foil layer can enhance the sealing, but it cannot be heated in a microwave.
PET/VMPET/PE (polyester/aluminum-plated polyester/polyethylene): Aluminum-plated instead of full aluminum foil, lower cost, still has good barrier properties, suitable for snacks, dried fruits, etc.
KPET/PE (high temperature resistant polyester/polyethylene): can withstand high temperature sterilization (such as sauces, cooked food), suitable for products that need pasteurization.
Transparent structure (PET/PA/PE): high transparency, showing the appearance of the product, suitable for candy, baked goods, etc.
Degradable materials (PLA/PBAT): environmentally friendly, but more expensive, suitable for brands that emphasize sustainable development.
Recommendations: Choose according to product characteristics:
Easily oxidized food → Choose aluminum foil or aluminum-plated layer.
Microwave heating required → Choose high-temperature resistant materials without metal layer (such as KPET).
Environmental protection requirements → Choose degradable composite materials.
2. Functional design
Zipper seal (Zipper): can be opened and closed repeatedly, suitable for products that are taken multiple times (such as snacks, milk powder, tea, coffee). Check the durability of the zipper (opening and closing times ≥ 50 times).
Spout/screw cap (Spout): convenient for pouring liquids or powders (such as beverages, laundry detergent).
Gusset: The bottom must have sufficient support design to ensure that the bag can stand firmly.
Anti-counterfeiting/anti-theft design: such as easy-to-tear mouth, disposable seal, suitable for high-value goods.
3. Printing and appearance
Printing process:
HD flexographic printing: suitable for simple patterns, low cost.
Gravure printing: bright colors, suitable for complex designs (such as food packaging).
Digital printing: small batch customization, high flexibility.
Surface treatment: matte/gloss film coating: enhance texture.
Local UV: highlight logo or key information.
Note: Make sure that the printing ink meets food safety standards (such as EU 10/2011).
4. Sealing performance test
Heat seal strength: use professional instruments to test whether the edge is easy to crack (especially for heavy objects or liquid packaging).
Leakage test: squeeze after loading the product to observe whether there is leakage (especially important for nitrogen-filled fresh-keeping packaging).
5. Applicable scenarios and capacity
Food: must comply with FDA or GB standards, and high barrier materials are preferred.
Daily chemicals (such as laundry detergent): focus on chemical resistance to avoid corrosion of materials.
Capacity selection:
Small capacity (50-200g): suitable for snacks and tea.
Large capacity (500ml-1L): suitable for liquids and pet food.
6. Supplier evaluation
Qualification: Check whether it has passed ISO 9001, BRCGS (food packaging certification), etc.
Sample test: Require samples to test the sealing and durability of the actual filled products.
Customization service: Whether it supports flexible customization of size, material, and function.
