First half of 2010, Construction The unstoppable boom, largely benefited from the economic stimulus 4 trillion national chain pull effect. 4000000000000 investment plans despite the end of 2008 had already started, but the first half of 2010 is still a large number of investment projects into four-trillion-start the construction phase, together with new projects in 2009 the continuation of construction of the scale, can be expected Construction Machinery Speed development of the industry has become an inevitable event. Facts have proved that the first quarter of 2010, construction machinery industry market was on fire, some enterprises than-expected sales, and even set a record. HC Engineering Machinery Network editor in May 2010 summed up the major construction projects in China, and some provinces and cities construction projects for the industry.

Inventory of major projects Cheng West High Speed Rail opened on February 6

Zheng officially put into operation in the West High Speed Rail

2010 2 6, central and western China to connect the first high-speed railway between Zhengzhou, Xi’an High-Speed Railway put into operation, the two trains directly to the shortest time reduced by the more than 6 hours to 2 hours. At 10:50 on the 6th, Zhengzhou, Xi’an bound G2004 times speed of 350 km made “Harmony” EMU train station starting in Xi’an and Zhengzhou to Xi’an High-Speed Railway put into operation.

2005 9 25 construction commencement date, the construction of high-speed railway from Zhengzhou to Xi’an is “long-term railway network plan,” “four vertical and four horizontal” Xuzhou-Lanzhou an important part of high-speed railway, line length 505 km, construction budget 353.1 billion. Across the board consists of Zhengzhou, Xingyang South, Gongyi Nan, south of Luoyang, Mianchi south, Sanmenxia South, Lingbao West, Mountain North, South and Xian Wei 10 bus stations. In the test run, the domestic CRH3 “Harmony” EMU a maximum speed of 394.2 km.

Started the Yangtze River Delta Shanghai-Hangzhou high-speed rail transport will become the “iron triangle”

Shanghai-Hangzhou high-speed railway project progress 2010 1 month, Shanghai-Hangzhou Railway Passenger Buyun the successful completion of the main bridge, one month ahead of schedule than expected. February 10, after two days of fighting, the Bureau of Shanghai-Hangzhou-off construction of two special projects in Hong Kong continuously Liangshun Li pouring across bamboo completed. This is the project completed within the pipe’s first continuous beam. February 23, Shanghai-Hangzhou high-speed rail project and lay integrated transport hub in the first pile, marking a set of transport, culture, commerce, tourism in one of the regional integrated transport hub in the official groundbreaking. May 17, a main span 160 m, 16,800 tons of unilateral twist across the Shanghai-Hangzhou Expressway anchored swivel bridge deck concrete, the successful closure in the Shanghai-Hangzhou passenger line, which marks the construction of Shanghai-Hangzhou Passenger and our high-speed railway construction technology major breakthrough. May 18, Shanghai-Hangzhou high-speed railway bridge across the Shanghai-Hangzhou Expressway smooth docking.

2009 started construction of the Shanghai-Hangzhou passenger line length 159 km, across the board to the main bridge in the new length of line, the bridge length accounted for 90.3%, this proportion is second to none in the world railway history of. Shanghai to Hangzhou, 2010, of 40 minutes to reach the goal of each iron.

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With the growing emphasis on the development of social security, and Environmental protection , New Phenolic resin New varieties and phenolic resin molding technology has been developed. According to experts, industry associations epoxy, phenolic resin, synthetic resin, the first industrialization have been 100 years of history, because it easy to get raw materials, synthetic resin after convenience and performance to meet many application requirements, so die Plastic , Insulation materials, Paint , Wood adhesive and so widely used. In recent years, as people increased security requirements, with the flame retardant, low smoke, low toxicity and other characteristics of phenolic resin attracted renewed attention, particularly in airports, train stations, schools, hospitals and other public buildings, facilities and aircraft interior decorative materials, the application is increasing. And unsaturated Polyester Resin compared to the low reactivity of phenolic resin, curing the condensation of water release, so curing must be carried out under high temperature and pressure conditions, a long time before the general can only enhance the materials impregnated prepreg (cloth). This method can only be used

molding process or the winding process, severely limited its application in the field of composite materials. In order to overcome the shortcomings inherent in phenolic resin, to further improve the performance of phenolic resin to meet the needs of high-tech development, people phenolic resins a lot of research to improve the toughness of phenolic Resin, improve mechanical properties and heat resistance, improved process performance become a focus of the study. In recent years, China has successively developed a series of new phenolic resin, such as the modified phenolic resin, vinyl acetylene-modified phenolic resin, cyanate ester ring-opening polymerization of phenolic resin and phenolic resin. Can be used for SMC / BMC, RTM, pultrusion, spray and hand lay composite molding technology. Modification of phenolic resin present mainly in the field to 12. First, Polyethylene Alcohol acetal modified phenolic resin, industrial application was most of the phenolic resin modified with polyvinyl acetal, which can increase the resin bond strength of glass fibers to improve the brittleness of phenolic resin to increase the mechanical strength of composite materials reduce the curing rate and thus help reduce the molding pressure, use of hydroxymethyl acetal and phenolic resin reaction is an excellent special ink carrier resin.

Second, polyamide modified phenolic resin, phenolic resin modified by polyamide resin improved the impact toughness and adhesion, as modified polyamide is a polyamide type hydroxymethylation use hydroxymethyl or active hydrogen in the process of synthetic resin or the resin curing reaction during the formation of chemical bonds to achieve the purpose of modification, with the fishing rod made of resin such as thin-walled tube has excellent mechanical properties. Epoxy resin is very common. China Epoxy Resin Industry Association, said experts with thermosetting phenolic resin and bisphenol A epoxy resin mixture can be made of composite material advantages of both the two kinds of resin, to improve their own shortcomings so as to achieve the purpose of modification. This mixture has excellent adhesion of epoxy resin to improve the brittleness of phenolic resin, phenolic resin also has excellent heat resistance, poor heat resistance of epoxy resin to improve the shortcomings. This modified by methylol phenolic resin and epoxy resin in the hydroxyl and epoxy group in chemical reactions, and the hydroxyl group of phenolic resin and epoxy resin in a chemical reaction, the final pay linked to form a complex body structure to achieve the objective, is the most widely used method of phenolic toughening.

The first four areas that silicone modified phenolic resin, silicone resin has excellent heat resistance and resistant to moisture resistance, using different organic silicon monomer or mixed monomer and phenolic resin with different properties available The modified phenolic resin, with a wide range of selectivity, as a transient high temperature materials for rocket, missile and other ablative materials; boron can also be modified phenolic resin, phenolic resin, due to the introduction of the molecular structure of inorganic boron elements, making modified phenolic resin heat resistance, instantaneous heat resistance, erosion resistance and mechanical properties better than conventional phenolic resins are used for rockets, missiles and space vehicles and other space technology as a good resistance to burning erosion material; rubber modified phenolic resin by blending mode to add the phenolic resin, acrylonitrile-butadiene rubber is an effective way of toughening, rubber, resin quality and the quantity is usually 2 to 10%, impact toughness can increase by 100% or more, The resin can be widely used in aerospace and other fields.

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With Economy Development and improvement of living standard, China’s dairy industry has been rapid development and growth, people’s lifestyles and dietary patterns also changed significantly, the milk on the table of ordinary people has become essential goods, which, using plastic film flexible packaging of milk accounts for a significant proportion of this packaged milk is usually carried out using automatic filling machine filling, we must first carry out sterilization of milk and packaging films, followed by aseptic filling into the milk then Plastic Packaging Bag. In this paper, this milk packaging film Print Process analysis and discussion.

Milk Plastic Packaging 1. Types of thin film materials

Milk packaging film materials used in the film mainly Polyethylene (PE) Co-extruded film, according to the basic can be divided into three layers:

simple milk packaging film, usually single-layer film, it is by a variety of Polyethylene (PE) Add a proportion of white material Color Masterbatch Material, formed by the blown film equipment. This milk, non-barrier packaging film structure, use of pasteurization (85 / 30min) for hot-fill, shelf life is shorter, only 3 days.

three layers of black and white co-extruded packaging films, heat sealing the inner layer to add in the black Color Masterbatch Materials play a role in blocking light. The packaging film with ultra high temperature sterilization (UItraHighTemperatureSterilization, abbreviated UHT) and hydrogen peroxide (H2O2) sterilization method, room temperature shelf life of up to 30 days.

five-story structure of white co-extruded packaging film, blown film of the middle barrier layer increased (from EVA , EVA L and other high barrier resin composition), so that aseptic packaging films are high barrier packaging films, have a longer shelf life, stored at normal temperature is about 90 days.

2. Film performance requirements Be noted that, in order to meet the high-speed filling requirements of automatic filling machine, milk packaging, polyethylene film must meet the performance requirements of the following aspects:

good smoothness Film should have good internal and external surface smoothness to ensure high-speed automatic filling machine filling can be carried out smoothly, so the static friction coefficient of film surface should be relatively low, generally require 0.2 to between 0.4. Film smoothness is mainly achieved by adding the slippery agent, in the film after molding, slippery agent within the migration from film to the surface, accumulate into a uniform thin layer, can significantly reduce the friction coefficient of film to make film with good smoothness results. Slippery agent is usually oleic acid amide, or erucic acid amide, it is only a mechanical polymer mixture of polyethylene and can not very well compatible with the molecular thermal motion so that it gradually to the low free energy of the interface migration, forming a layer of weak interface layer, so if slippery agent content is too high, it will affect the film’s printability, which is extremely unfavorable for printing.

strong tensile strength As plastic film in the filling process to be automatic filling machine from the role of mechanical tension, therefore, requested film must have sufficient tensile strength to prevent the automatic filling machine was under the influence of tension pull off. Used in the blown film process melt index (MI) or lower LDPE HDPE Particles, for improving the tensile strength of polyethylene film is very beneficial.

wetting surface tension values to meet the requirements

To make printing ink to the smooth surface of the polyethylene plastic film spreading, wetting and adhesion, the surface tension of film should be required to achieve a certain standard, otherwise it will affect the adhesion of ink on the surface and solidity to affect the printing quality. General requirements for the surface tension of polyethylene film to achieve the best 38dyne (dyne) above, if we can reach more than 40dyne better.

Since polyethylene is a typical non-polar polymers, the molecular structure of non-polar groups, and high crystallinity, surface free energy is low, highly inert, high crystallinity, chemical stability Therefore, poor printability of the film material, the adhesion of the ink is not ideal. In addition, the films of auxiliaries (slippery agent, Plasticizer Etc.) continue to migrate to the surface precipitation of a weak surface layer, will also affect the fastness of printing ink, therefore, must be printed on the plastic film before the general conduct Surface Treatment Change the chemical structure of films and improve film surface tension so as to enhance and improve the polyethylene film Printability purpose of improving the adhesion of the ink to ensure smooth production.

excellent sealing performance

Films have a good seal bag, there has been a good sealed off, meaning that it is necessary to ensure the sealing, but also a smooth cut, so that molten resin will not stick knives. In the film blowing process of adding a certain percentage of LLDPE Milk film can be significantly improved low temperature sealing performance and sealing performance of inclusions, but the addition of LLDPE not too large, otherwise it would be too high viscosity of polyethylene milk film, stick easily when knife seal failure.

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