Research on the hottest packaging materials 1

2022-07-26
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Research on packaging materials

2. high barrier plastic packaging materials

can actively help customers improve product continuity

high barrier plastic packaging materials have developed with the rapid development of the food industry, and have been rapidly developed and widely used in the packaging industry, especially in the food packaging industry. It plays a role in food quality, freshness, flavor and shelf life. There are various technologies for preserving food, such as vacuum packaging, gas replacement packaging, sealed deoxidizer packaging, food drying packaging, sterile filling packaging, cooking packaging, liquid heat filling packaging, etc. Many of these packaging technologies use plastic packaging materials. Although they are required to have a variety of properties, it is important that they all have good barrier properties. In the packaging industry, the common high barrier film materials are as follows:

nylon packaging materials. Nylon packaging materials used to use "nylon 6". But the air tightness of "nylon 6" is not ideal. There is a kind of nylon (mkd6) polycondensated from m-dimethylamine and adipic acid. Its air tightness is 10 times higher than that of "nylon 6". At the same time, it also has good transparency and cracking resistance. It is mainly used for high barrier packaging film and soft food packaging with high barrier requirements. Its food hygiene is also approved by FDA. As a thin film, its greatest feature is that its barrier property does not decrease with the rise of humidity. In Europe, as a substitute for PVDC films, MXD6 nylon is used in a large amount due to outstanding environmental protection problems. A new type of film with bi-directional extensibility, which is composed of MXD6 nylon and EVOH, is used as a nylon film with high barrier. The methods of compounding include multilayer compounding and blending and stretching of MXD6 nylon and EVOH

p some dust VDC materials (polyvinylidene chloride) will inevitably be produced during the experiment. Polyvinylidene chloride (PVDC) resin, as a composite or monomer material and co extruded film, is the most used high barrier packaging material in the packaging industry. Among them, PVDC coating film is the most widely used. The PVDC coating film uses polypropylene (OPP) and polyethylene terephthalate (PET) as the substrate. However, pure PVDC has high softening temperature, close to its decomposition temperature, and poor compatibility with general plasticizers, so it is difficult to heat up and directly apply. The PVDC films actually used are mostly copolymers of vinylidene chloride (VDC) and vinyl chloride (VC), and films with good barrier properties made by copolymerization with methyl acrylate (MA)

evoh materials. EVOH has been the most widely used high barrier material. In addition to the non stretching type, the film types of this material include biaxial stretching type, aluminum evaporation type, adhesive coating type, etc. Biaxial stretching type and heat-resistant type are used for aseptic packaging products. The film made by CO extrusion of eboh resin with polyolefin, nylon and other resins is mainly used for animal product packaging

in recent years, the international community has been calling for more and more green packaging. However, as a high barrier packaging material, the waste of PVDC, which is widely used, will produce HCI during combustion treatment, resulting in environmental pollution. Therefore, there is a trend to be replaced by other packaging materials. For example, the so-called coating film prepared after SiOx (silicon oxide) is coated on the film of other substrates has been paid attention to. In addition to the silicon oxide coating, there is also the aluminum oxide evaporation film, which has the same air tightness as the silicon oxide coating obtained by the same method. At the same time, due to the rapid development of multi-layer composite, blending, copolymerization and evaporation technology, high barrier packaging materials such as multi-layer composite of copolymer EVOH, polyvinylidene chloride (PVDC), polyamine (PA), polyethylene terephthalate (PET) and silicon oxide evaporation film have been further developed, especially the following products: MXD6 polyamide packaging materials, polyethylene naphthalate (pen) Silicon oxide evaporation film, etc

3 characteristics of fatigue pulse experimental machine. New fresh-keeping packaging materials

in recent years, due to the specialization of agricultural production and people's requirements for improving the quality of life, there are more and more long-distance transportation of fresh fruits and vegetables, which makes the demand for fresh-keeping packaging materials that can prolong the storage life and shelf life of fresh fruits and vegetables greater and greater. A common feature of fresh fruits and vegetables is that they continue to breathe after picking, and breathing is accompanied by metabolism, water evaporation and ethylene production, which promotes the further maturation of fruits and vegetables until they decline. At the same time, this environment also makes bacteria easy to breed and multiply rapidly, leading to the rapid decay of fruits and vegetables. In order to prolong the storage and shelf life of fruits and vegetables, the research and development of new multi-functional fresh-keeping packaging materials have been strengthened at home and abroad. Most of the fresh-keeping technologies achieve the purpose of fresh-keeping by means of microporous or improving the film formula structure, improving the controlled atmosphere environment (atmosphere) in the packaging bag, and using the combination of deoxidizer and selective permeation through the film. In particular, the following products will receive greater attention

functional fresh-keeping film. A Japanese company has introduced a kind of strong sealing packaging bag, which is made of a kind of plastic called "qikelun" and has excellent anti-oxidation effect. It can be used to pack new rice. The fresh-keeping effect is particularly good. It can keep the color, aroma and taste of rice unchanged for a long time, and the carbon dioxide generated in the bag can also prevent insects and mold. Another paper company in Japan produces a fruit fresh-keeping packaging box. It adds a layer of polyethylene film on the corrugated paper lining of the corrugated box, and then applies a waterproof wax coating containing a trace of fruit disinfectant to prevent the evaporation of fruit moisture and inhibit respiration, so as to achieve the purpose of preserving freshness. This kind of packing box can keep the fruit fresh for one month

an American company has launched a new type of fresh-keeping plastic bag for fruits and vegetables, which can prolong the fresh-keeping period of fruits and vegetables and reduce the loss of fruits and vegetables caused by too fast ripening. The packaging bag is made of natural activated clay and polyethylene, which is like a very fine filter screen. The gas and water generated during the ripening process of fruits and vegetables can pass through the packaging bag, which is not easy to breed fungi, thus extending the freshness of fruits and vegetables by more than one time. In addition, an American company has developed a plastic fresh-keeping bag that can keep fresh for up to 3 years. This kind of fresh-keeping bag attaches a layer of plastic film to the inside of the plastic part material bag in the ordinary plastic permanent bonding high-voltage battery. The film contains oxygen getter, which can absorb the oxygen entering in the process of food packaging, which makes the microorganisms that cause food decay unable to survive due to lack of oxygen

(to be continued)

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