Many food packaging will use metal packaging materials, such as tinplate lids, tin boxes, etc. Generally speaking, metal packaging materials have the following advantages:
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(1). It has excellent barrier properties and excellent comprehensive protection properties. The permeability of metal packaging materials to gas, water and water vapor is extremely low (almost zero), has good fragrance retention, and is completely opaque, which can effectively avoid the harmful effects of ultraviolet rays; its gas barrier properties, moisture resistance, The shading and fragrance retention far exceed other types of packaging materials such as plastic and paper. Therefore, metal packaging can provide excellent protection for the contents, which is beneficial to maintaining the quality of the product for a long time.
(2). It has excellent mechanical properties, processability and high strength. Metal packaging materials have good ductility and high strength, and can be processed by stamping, rolling, stretching, welding, etc., and can be made into packaging containers with thin walls, high compressive strength, and not easy to break. These materials are combined to form a composite packaging material with excellent comprehensive performance.
(3). It has a special metallic luster and good surface decoration. The special metallic luster and the exquisite decoration and printing can make the product appearance rich and gorgeous, beautiful and marketable, and at the same time can increase the value of the product. Packaging tin box
(4). Convenient and sanitary. Metal packaging containers and inner coatings-generally can meet the requirements of hygiene and safety, the products packaged with them are easy to carry and use (generally equipped with easy-opening devices, such as the pull ring of a can), can adapt to different climatic conditions, and are discarded It has good material handling properties and can be recycled and reused.
Although metal packaging materials have many advantages, they also have disadvantages, including:
(1). The chemical stability is poor, especially the steel materials are easy to rust, and generally should be coated with anti-rust materials: acid and alkali resistance is weak, when packaging acidic materials (especially food), metal ions will precipitate and affect the product Quality, generally requires inner coating isolation protection:
(2). The price of metal packaging materials is higher than other packaging materials, and the overall packaging cost is also higher.
Volatile Corrosion Inhibitors (VCIs) have been around since the ’s, when a product named Dichan was introduced into market. Dichan consisted of dicyclohexylamine-nitrite, which was described as a vapor phase corrosion inhibitor that had sufficient vapor pressure to release corrosion inhibiting molecules into the surrounding area. Eventually, this chemistry began to be coated onto paper, however, due to the dicyclohexylamine-nitrites high vapor pressure, they began to find that the chemistry diffused rather quickly and was found to flake off the paper. In addition to these issues, it was discovered that VCI Paper tended to hold corrosion accelerating moisture in direct contact with the metal part which was causing just as much harm as good.
Due to the health risks and the performance of VCI Paper, VCI manufacturers were in search for a new, safe, and effective application. In , Northern Technologies International Corporation (NTIC) made two significant innovations. NTIC not only managed to introduce a new VCI chemical system to the market that was used as a common food additive (sodium nitrite) but was also able to successfully impregnate this additive into plastic films. By the early ’s, NTIC starting to sell VCI Paper with similar VCI technology under the brand name ZERUST® which left customers with a common question: What advantages/disadvantages does VCI Poly have over VCI Paper?
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The four main advantages are:
1) VCI Poly film provides a superior moisture barrier compared to VCI Paper. Poly film lowers the water vapor transmission rate of the packaging and prevents even normal levels of moisture from seeping through the package and causing corrosion.
2) VCI Poly offers ease of use. Metal parts and assemblies can simply be placed into a VCI bag or crate lined by a bag. Items are easy to remove from the packaging as well. VCI film packaging products are typically translucent and items can be seen through the packaging allowing users to quickly see the items in the container.
3) VCI Poly bags also protect metal assets from dust and contaminants when sitting in storage and/or during shipping. Typical poly film/bags provide similar benefits, however, will not provide corrosion-inhibiting protection.
4) Long shelf and service life. Product life can vary between manufacturers, but typically VCI film can be stored in its original airtight packaging for up to three years. When properly applied, it will provide corrosion protection for many years to clean and dry metals.
1) An advantage of VCI Kraft Paper is the fast diffusion rate of the VCI, allowing the chemistry to quickly reach the metal surfaces. The diffusion rate is typically faster than VCI Poly chemistry.
2) VCI Kraft Paper tends to have a slightly lower cost compared to VCI poly.
3) VCI Kraft Paper can be easily formed around your metal parts
4) VCI Kraft Paper also provides cushioning when crumpled to add additional protection to your parts during shipping.
The good news is both products can be used in packaging programs to leverage the benefits of each type. For example, a container could be lined with a VCI gusset bag and individual parts can be wrapped in paper to stabilize them in shipping. A combination of VCI Poly sheeting or VCI Kraft Paper could be used for interleaving between layers. Interleaving with either material increases the saturation levels of VCI and ensures it reaches all spaces of the container.
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