LDPE(Low-density polyethylene): is widely used for manufacturing various containers, dispensing bottles, wash bottles, tubing, plastic parts for computer components, and various molded laboratory equipment. Its most common use is in plastic bags.
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HDPE (High-density polyethylene): is known for its high strength-to-density ratio. This plastic is usually milky white or semi-translucent, has superior puncture, low permeability and temperature resistance, and is more rigid and stronger than LDPE / LLDPE but also tears easier and has a propensity to crinkle.
PVDC: Polyvinylidine chloride, the excellent oxygen and moisture barrier properties of PVDC make it a ideal material for packaging converters. But the high cost of PVDC tends to mean that it is mainly used in the form of copolymers.
PET: Polyethylene terephthalate, is a very strong clear glossy film, and possesses a great number of advantages, such as good moisture and gas barrier properties, tensile strength, etc.
BOPP (Biaxially-oriented polypropylene): BOPP films are easy to produce with low costs. They have good chemical compatibility and offer superior moisture vapor barrier properties.
(Kraft) paper: has high tensile strength and elasticity, good tear resistance and is designed for packaging products with high demand for strength and durability. It is used for products like single multiwall paper bags and sacks (for cement, food, chemicals, consumer goods, flour bags etc.), sale bags for bakery products, wrapping.
Aluminum foil and metalized substrates: Aluminum foil has the best dead fold properties. It provides an excellent 100% barrier to all gases, moisture and light. It is a good reflector of radiant heat, usually supported with plastic and/or paper (in multy-layer structure) because it cracks when folded. Alone does not provide an acceptable aroma or odder barrier.
Metalized PET: are polymer films coated with a thin layer of metal, usually aluminium. They offer the glossy metallic appearance of an aluminium foil at a reduced weight and cost.
EVOH (Ethylene Vinyl Alcohol): is produced by a controlled hydrolysis of ethylene vinyl acetate copolymer. It&#;s most important characteristic is the outstanding Oxygen and odor barrier properties. Packaging structures with EVOH provide high retention of flavors, and prevent quality loss associated with reaction of oxygen with the product.
CPP (Cast Polypropylene): offer excellent heat seal strength, good thermal stability, good puncture resistance, good clarity and fair barrier properties. The film type also has good yield economics owing to its low density. Some of the typical application areas for the film includes hot filling and retort applications, high speed application on FFS machines and bakery products.
PLA (Polylactic acid): Polylactic acid is thermoplastic aliphatic polyester synthesized from renewable biomass, typically from fermented plant starch such as from corn , cassava , sugarcane or sugar beet pulp. In , PLA had the second highest consumption volume of any bioplastic of the world. PLA is compostable, but non-biodegradable according to American and European standards because it does not biodegrade outside of artificial composting conditions.
PBS (Polybutylene succinate) : Polybutylene succinate is a thermoplastic polymer resin that has properties comparable to propylene. It is used in packaging films for food and cosmetics. In the agricultural field, PBS is used as a biodegradable mulching film PBS can be degraded by Amycolatopsis sp. HT-6 and Penicillium sp. strain 14-3. In addition, Microbispora rosea, Excellospora japonica and E. viridilutea have been shown to consume samples of emulsified PBS.
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Several factors impact the production of retort pouches, ensuring their quality, safety, and suitability for high-temperature processing. According to the requirements of the U.S. Food and Drug Administration (FDA), the tolerance of adhesives under high-temperature conditions is crucial. Materials such as modified polypropylene (mPP) and aliphatic polyurethane (PU) are commonly used to ensure compliance with standards. These factors are elaborated below:
1.Adhesive Selection:
Modified Polypropylene (mPP): mPP adhesives are widely used in retort pouches due to their excellent heat resistance and adherence to various substrates. They provide strong bonding under high-temperature and high-pressure conditions.
Aliphatic Polyurethane (PU): PU adhesives are known for their high-temperature resistance, making them suitable for retort applications. They offer excellent bonding strength and flexibility, ensuring the pouch's integrity during the retort process.
2.Film Materials:Polyester (PET): PET films are commonly used in retort pouches due to their high-temperature resistance, durability, and ability to maintain the pouch's shape during processing.
Nylon (PA): Nylon films provide excellent puncture resistance and are suitable for packaging products with sharp edges or corners.
Aluminum Foil: Aluminum foil layers act as a barrier against light, oxygen, and moisture, preserving the food's freshness and extending shelf life.
3.Quality Control:Strict quality control measures are essential throughout the manufacturing process. Automated systems are employed to monitor pouch formation, sealing, and integrity. Quality control checks include seal strength testing, visual inspection for defects, and sample testing to ensure the pouches meet the required standards.
4.Innovative Designs:Continuous research and development lead to innovative pouch designs that enhance functionality, convenience, and visual appeal. Manufacturers explore new materials and structures to improve the overall performance of retort pouches.
5.Regulatory Compliance:Manufacturers must adhere to regulations and standards set by regulatory authorities such as the FDA. Compliance ensures that retort pouches are safe for consumers and suitable for various food products.
In summary, adhesive selection, film materials, stringent quality control, innovative designs, and regulatory compliance are critical factors in the manufacturing of retort pouches. By addressing these factors, manufacturers can produce high-quality, safe, and innovative retort pouches that meet consumer demands and regulatory requirements.
Contact us to discuss your requirements of custom food retort pouch suppliers. Our experienced sales team can help you identify the options that best suit your needs.