What are the main properties of plastics?

What are the main properties of plastics?

Plastic have appeared only one hundred years, but developed very fast, because many plastics have the excellent and unique properties. There are differences in the performance of different plastics, here are some same properties of plastics.

Good stability, in general plastics have good corrosion resistance in acid, alkali, salt medium of which the concentration, temperature are not high, a few plastics is also resistant to acids, alkalis, for example, the "plastics king"-PTFE (poly tetrafluoroethylene) can withstand even in the strongest corrosion "aqua regia". Plastics are difficult degradation in nature, then are durable for use.

Beautiful and low density, plastics are generally light weight, about 1/2 of aluminum , 1/ 5 of steel, and some plastics such as PE, PP are even lighter than water, so their products are naturally very lightweight. In addition, the majority of plastics are  nice appearance, such as light, transparent, etc., as well as easy for coloring, this can make products with a variety of gorgeous colors, and making the products greatly welcomed.For example,if you are PP bags manufacturer,with adding some colorful master batches in the polypropylene, you can make colorful PP woven bags.

Excellent electrical insulation, most plastics have good electrical insulation properties, as there are not free ions inside the polymers, plastic does not have conductivity, but due to added the additives, make some changes of the electrical insulating properties, most of the plastics have electrical insulation in the low-frequency, low-voltage insulation, a few plastics even have in high frequency, high voltage insulation, so plastics are widely used in electronic, electrical, communications, equipment, and other fields.

Good mechanical properties, the mechanical properties of the plastic is not good compared with the metal, but plastic is much lighter than metal, therefore the calculation of the intensity per unit mass (also called specific strength) is close or exceed the traditional metallic material, and some plastics. Therefore, we can use plastics to make many structural components.

Good barrier properties, plastics have excellent barrier properties to gases and water vapor,  can be used to produce a variety of plastic containers and films, can play a very good waterproof, moisture-proof effect.

Good processability, the plastic resins are low melting point, so are easily melted, can form into dimensionally stable, good quality plastic products in a very short time.

InterPlas Thailand 2014.

InterPlas Thailand, the only international plastics & rubber manufacturing machinery and technologies exhibition in Thailand, will open its 23rd edition from June 19-22, 2014, at BITEC, Bangkok, Thailand, to showcase the latest technologies from 260 leading brands from 14 countries to over 50,000 buyers from various sectors, including auto-parts making and packaging and housefhol appliance sectors, from across ASEAN. The event will help all industrialists upgrade their production line and products'value.

There are more than 35,000 customers from Southeast Asian countries to visit the exhibition 2013, and more than 1,000 exhibitors from over 10 countries and regions participating. Exhibition area is ​​about 40,000 square meters. The exhibition is professional, technical standards representative, reflecting the level of development in Asia and the world of plastic and rubber plastics and rubber exhibition of industrial development, is the largest plastics and rubber exhibition in Thailand.

Show products:

Plastic Machinery and equipment: injection molding machine, blowing machine, plastic rolling machine, blow molding machine, plastic molding machine, plastic granulator, plastic extrusion machines, presses auxiliary other plastics machinery, feeding renewable crusher, film drawing machine, foam equipment, plastic mold , plastic products and raw materials.
Rubber machinery and equipment: plastic cutting machine, rubber extruder, mixer, rubber granulating machine, rubber cutting machine, autoclave, rubber laminating machine, rubber molding machine, rubber forming machine , rubber joint machine, vulcanizing machine, desulfurization machine, bag making machine, rubber calender rubber processing equipment and quality testing equipment of various plastic products and plastic film rubber processing chemicals, additives and auxiliary materials rubber processing molds and accessories.

Relevant market introductions:

Thailand is the largest producer and exporter of natural rubber in the world, Thai rubber occupies an important position in the international market. Thai Plastic Industries Association, said Thailand has been exploring the other applications of plastics, including multi-layer packaging films and bioplastics, especially multilayer films which are widely used in food packaging.

What is Multi-layer plastic film?

A mixture of several materials at the lowest cost is always used to achieve optimal packaging performance,therefore, plastic film is usually mixed with other plastic materials or other materials by coating, complex, and of coextrusion process.

1) Coating
A thin layer of plastic film commonly is coated on the surface of the other layer of plastics film or plastic sheet, or more generally, is applied to the non-plastic substrates such as paper, cellophane or aluminum foil. Can coated by a solution, suspension, or melt coated.The reason of give flexible packaging coating is coating can make paper, cellophane, aluminum foil more easily heat sealable; provide moisture resistant for
paper or cellophane; improve barrier properties; prevent the substrate in direct contact with the product.
Low density polyethylene is always coated on paper, this makes a heat sealing, moisture proof, protect the printing does not wear. It is also commonly used for aluminum foil, sealing and produce abrasion resistance, aluminum foil to prevent interaction with the product. PVDC copolymer coating is also used to improve the barrier properties and heat sealing.

2) Compound
Compound is the two kinds of the composite film substrate combined processes. In flexible packaging applications, it commonly uses plastic film combined with paper or foil, or paper and aluminum foil. There are a variety of complex methods used. When using plastic film as a substrate or layer of the final structure, the composite binder are generally low density polyethylene, to the composite by extrusion, the extrusion process is the compound. Flexible when there is paper in which the reason is often used because it has excellent printability, durability, strength and can produce. When using an aluminum foil, which is commonly used because it is light and permeate good barrier agent. Sometimes, in order to use it mainly obtain the desired appearance.
Another important application is the production of a composite material covered print. In this material, the first material is a negative printing, and then another substrate composite to a same or different polymer production. Printing can be seen through the transparent plastic to prevent wear and tear, so the appearance of the surface area more attractive bright printed updates.

3) Coextrusion
Co-extruded multi-layer film can be produced without the two steps:producing the first layer film, and then the two-layer film combined. The molten polymer is carefully added together, producing layered melt, and then in a conventional manner to produce a plastic film or sheet. Only when the plastic flexible packaging structure, in general, superior to composite coextrusion, unless a covering printing. But it is clear, can not use the non- co-extruded thermoplastic materials included.
Compared with the compound, the main advantage is the ability to use co-extruded thin layer of material capable of producing much thinner than a mono-layer film. This is particularly important for expensive substrates, as usual for imparting barrier properties of the material. The amount of expensive resins used
for produce the desired properties as long as it is sufficient. Thinness of the layer is not restricted by non-liner film production and processed in the subsequent process requirements of the composite.

Application of plastic film in agriculture.

Application of plastic film in agriculture.

In agriculture fields, in order to protect the plant and prevent water from loss, farmers use plastic films as bedding, and with the rapid pace of agricultural development, which greatly increased the demand for plastic film, plastic film.

The survey found that in developed countries, agricultural plastic film is more than 50% of all the total with agricultural polymer products, China ranks first in the amount of agricultual film in the world, the demand for up to 150 million tons per year, and each year 15% speed increase.

Role: To promote crop growth.

Common agricultural and mainly polyvinyl chloride polymer, polyethylene, polypropylene, unsaturated polyester resins and the like. In recent years, plastic film showing two significant effects: heat and moisture, it has been widely used in agricultural production. For example, the production of plastic film greenhouses or greenhouses can carry rice, cotton and melons, fruits, vegetables, nursery and cultivation.

Carried rice seedlings with plastic film can save seeds, improve crop resilience. Because plastic shed temperatures, moisture suitable for germination and seedling growth of rice to prevent cold and cold, avoid birds pecking child to avoid Rot Simiao phenomenon, reaching food production. Plastic film can also be cotton breeding, cotton extend the growing season, increasing resilience, cotton seed saving, so brocade flower production. With plastic film melon, fruit, vegetables, nursery cultivation, production can only grow exponentially and can be an early market, improve the quality and extend the supply period.

Growing vegetables tend to be restricted by natural conditions, lower north, the annual average temperature in China, the cold season is generally difficult to eat fresh vegetables, plastic greenhouses north in the cold season can grow fresh vegetables, fresh vegetables extend the supply of rich people's food basket.

In addition, the plastic film can also prevent insects and frogs, germination, deterioration, etc. In winter, used to cover agricultural products stacked in the open so you can keep warm. Plastic film can also be stored fruits and vegetables, greatly extend the shelf life of fruits and vegetables, reduce economic losses due to decay caused. Visible plastic film to agricultural production brought no considerable economic value.

Functional principle of polymer flame retardant.

Flame retardants take place chemical or physical interaction in the solid, liquid or gas, depending on their properties. They prevent the burning heating in particular stage of heating, decomposition, ignition or flame spread interference process.

A flame retardant is an alternative flame retardant mechanism of change necessarily implies. Halogen-containing flame retardants are mainly chemical interference occurs when the radical chain mechanism in the combustion process, a gas phase function. Bromine flame retardant removing energy released during combustion OH and H radicals formed. Although there are many compounds brominated flame retardants, flame retardant mechanism but are basically the same for all compounds. However, a different flame retardant bromide, because such a polymer compound will affect the physical properties of the polymer. Generally, the more the decomposition of aliphatic bromide therefore it is more effective at low temperatures, but the temperature is inferior to an aromatic flame retardant.

Hydroxide, aluminum hydroxide and other functions in a variety of processes. Upon heating, the water vapor released from the hydroxide, the substrate is cooled to below the temperature required to sustain combustion. The steam released in the dilution of the gas phase as well, forming a protective layer of an oxygen -substituted. In addition, the oxide layer of insulation also together form a protective layer and coking products. Phosphide major impact on the solid phase reaction occurs. After thermal decomposition, the flame retardant is converted into phosphorous acid, phosphorous acid in the solid phase extraction of the aqueous solution from the hot substrate to coking. However, like some of the phosphite with a halide, the mechanism of free radicals in the gas phase adsorption also.

People interested in going back to the fire-retardant polymer 19th century, when discovered extremely flammable cellulose nitrate and celluloid. In modern society, a large number of conventional plastics such as phenol, rigid polyvinyl chloride (PVC) and a melamine resin having sufficient flame retardancy.

In 1970's, the main flame retardant polymer is a thermosetting plastic, such as unsaturated polyesters and epoxy resins, reactive halides and their use alumina hydrate as an additive. Phosphate ester plasticized PVC, cellulose acetate film, unsaturated polyester and the modified polyphenylene ether also has a great market. Alumina trihydrate (ATH) is an unsaturated polyester largest amount of flame retardant in plastics.
In 1970's, the consumption is much lower than the halogen-containing flame retardants and other additives. The term " halogenated flame retardant " encompasses a wide variety of organic substances, the molecular structure has a chloro or bromo. Bromine and chlorine suppress combustion in organic material. Adding flame retardant plastics and fabrics to meet fire safety requirements.

Significance and necessity of warehousing in modern logistics.

Significance and necessity of warehousing in modern logistics.

The significance:
1)Maintaining the usage of commodity.
In the social production and life, it often appears inconsistent with the products manufacturing and consumption, so there will always be irrelevant now, or not take or necessary for future use of the product, then in order in the production and consumption guaranteed time lag usefulness product, it is necessary to storage means, which is the most basic sense warehouse.

2)Regulate the flowing of products.
With the further development of the economy, meaning of storage is changing. We know that the market demand gradually personalized, diversified production gradually to more variety, low-volume flexible production methods change, so too must adapt to modern logistics many varieties, small batch features, but more variety, small batch would mean the rising logistics costs, such as transport, too much small quantities, less than truckload inevitably lead to costly , so here it is necessary to coordinate the flow of product through the product process scattered plot role of warehousing, etc. We will be specifically behind talked about how to coordinate warehousing and distribution, to reduce costs.

3)Resolve the time contradiction between supply and demand.

The necessity:

1)Reduce transportation and production costs.
Although the establishment of product storage will increase costs, but it also can improve the efficiency of transport and production, the relative reduction of both cost and uncertain demand in the market, the case is difficult to predict, reserve a certain amount of product can effectively Out of preventing the generation of the cost, and also to ensure that the rhythm of the production run for a certain extent, so that the production plan can be implemented well, reducing the production costs, while the small -volume storage can be dispersed product transportation task set, integration conducive to the formation of the entire burden of transport and overall optimization of transport routes, thereby reducing transportation costs. Thus, although the formation of a new build warehousing costs, but it will also reduce operating costs in other areas, as long as the final cost reduction, it is necessary to establish warehousing

2)Regulate supply and demand.
Before talking about the significance of modern logistics warehouse to when it has been talked about, for example, the production of certain products due to raw materials and other aspects and seasonal features, but demand is continuous, so here it helps warehouse in regulating supply and demand contradiction that exists between . In the example, when the raw materials needed for the production of a product at a lower price within a certain time, the product manufacturer can purchase a certain amount of raw materials for the pre- stored for future production.

3)Needed by the production.
Storage exists not only in the products flowing but also in the product process, such as production logistics, we often mentioned temporary work in progress, raw material storage, etc., warehousing is also the non- production logistics the missing link.

4)Needed by the sales.
In order to win long-term loyalty of consumers, Modern enterprises usually take a quick customer response strategy, and the implementation of this strategy requires the help of the role of warehousing. Because the product close to the customer's place for storage can effectively prevent the occurrence of stock, shortening the delivery time of goods, which will effectively improve the quality of customer service.