Nanopolyester bottle molding process PET beer bottle latest results (below)

Nanomaterials are materials composed of crystals with a grain size of 1 to 100 nm. Since the grain size is much finer than that of conventional materials, the number of atoms at the grain boundary is greater than the number of atoms inside the grain. Nanomaterials are endowed with many exceptional properties, such as montmorillonite clay, due to the incorporation of fine grains into the interior of the polymer lattice, in which the sheet silicate layer impedes the diffusion of molecules in the material diffusion channel. Flow, thereby increasing the barrier properties of the material.

Polymer/clay nanocomposites can be processed using conventional thermoplastic processing equipment. Since natural montmorillonite is a hydrophilic material, it is incompatible with most organic macromolecules and replaces interlayers with organic cations. With the presence of sodium or calcium ions in the space, it is possible to obtain montmorillonite with affinity for organic molecules. Cross-reactions of such organic ions with ammonium ions or phosphorus-containing ions can form an organophilic surface. Ammonium ethanolate can reduce the surface energy of inorganic matrix materials, improve the surface wettability, and facilitate the interface between polymer and clay materials.

The structure of nanocomposite materials can be divided into two types: sandwich type and lamellar type. In the former, a single-stretched polymer chain is inserted into the middle of the silicate base layer to obtain a composite material with a plurality of aligned phase sandwich structures. In a laminated or layered composite material, the layers are laminated together. It is separable and the single silicate layer is dispersed within the polymer matrix. Polymer/silicate nanocomposites can be made from a variety of polymer materials such as polystyrene, polypropylene, polyamide, epoxy, and organic glass.

A small amount of nanomaterials can achieve high barrier properties, and 2% montmorillonite can reduce the permeability of polyimide by half. The incorporation of a certain proportion of platelet silicates in nylon-6 also imparts excellent oxygen barrier properties and mechanical properties to nylon. This material has a more uniform oxygen-barrier layer than conventional nylon-6, has better gas impermeability, doubles the oxygen barrier efficiency, and reduces oxygen permeability (OTR) by half, while other properties remain almost constant.

6, nano-polyester composite packaging materials application

In order to improve the performance and application range of polyester packaging materials, European, U.S. and Australia launched trial production of polyester composite materials. In the second half of 1997, the composite test of PET, PEN and liquid crystal polymer (LCP) began. The United States Superex polymer company first in the world using PET / AD / LCP's three-tier structure (AD for the adhesive layer) to produce 330-600ml beer bottles, is jointly promoted with a Japanese winery. At the end of 1997, HoechstTrevira GmbH, Germany, has begun testing PEN composite beer bottles and competed in the beer bottle market. Australian Aslp Corporation is developing a polyester multi-layered packaging container to extend the shelf life. In 1997, Japan began to produce colorless nano-transparent ceramic membrane/polyester advanced packaging materials. Japan's Toyo Steel Co., Ltd. has invested 4 billion yen to develop a composite packaging material in which the steel sheet or aluminum sheet is bonded to both sides of the polyester film, which greatly improves the protective performance and production efficiency of the packaging cans.

Krones started to launch the "PET blow-blow-filling integrated production line" for beer (Europe's annual sales have reached 100 million marks, and will reach 2 billion marks in the future). Prior to finding a better blowing process for beer-filled PET bottles, there are currently plasma-based inner and outer coatings, PEN/PET, and multilayer bottle methods, but these methods have advantages and disadvantages.

As a beer packaging container, the first is the issue of safety (bottle bursting), the B-bottle does not allow the bomb to disappear; the second is a lightweight problem, generally 640ml beer bottles are 460 ~ 540g, or to improve the bottle from the perspective of safety The pressure capacity, the bottle weight increased to 600g; the third is a health issue, the glass is hygienic, the new material requires persuasive certification; the fourth is the appearance of the consumer's senses and fashion issues.

Now, the traditional one-step blowing method is more difficult to guarantee the geometric size of the container, high transportation costs, and there is a secondary pollution problem. The application of nanotechnology in the industrialization of PET beer bottles is best to consider using a two-step method. Will use existing equipment and nanotechnology.

For polyester film manufacturers, it is hoped that nanotechnology will be introduced into the production of polyester film to solve the barrier problem. Enterprises that produce plastic extrusion blow machinery equipment need to solve the problem of combining nano-montmorillonite with PP and PE at the site, then using extrusion blow molding technology to make bottles and improving the barrier properties of packaging bottles.

Beer is an unstable colloid, and its biological stability and non-biological stability, in addition to oxygen problems, and shading problems. Brewing companies will have a change in packaging. The new type of PET bottle filling beer is used once, if the container is filled with aseptic filler by the color printing method, the impact on the existing filling production line is not small (for example, the bottle washing machine, sterilization machine, labeling machine, etc. are reduced. Process equipment, the entire bottle system must be changed). The production capacity of bottle blowing machinery in foreign countries has reached 20,000 to 60,000 bottles/h, and the production capacity of domestic products is too low, which is a direction that should arouse the attention of machinery and equipment manufacturers.

Source: Jiagong Machine Grid