Elastic sheath film for the hottest packaging tray

With the continuous expansion of the application field of stretch hoods packaging, the blow film processing industry is being promoted to obtain good development opportunities. Analysts from applicable market information consulting (AMI) in the UK (based in Bristol) pointed out that by 2007, the annual growth rate of European market demand for elastic sheath packaging products alone had exceeded 22%, while the annual growth rate of European market demand for stretched film products in the same period was only 5.5%. According to John campin of AMI, the so-called elastic membrane packaging is to use elastic membrane tubes to wrap and pack stackable cargo pallets. However, at present, stretch film (single-layer or multi-layer surrounding packaging film with elastic stretch performance) accounts for 67% of the market demand of all goods pallet packaging products. In addition, it is predicted that another competitive technology product applied in the packaging of goods pallets - shrink sleeve film (in the heating state, the film tube shrinks along the stackable goods pallets, and the packaging method will release harmful chemicals when the medical devices containing PVC are used and discarded in the routine way). By 2007, the annual demand will be 2.3% lower than the current one. At present, the annual demand for pallet packaging products in the whole European market is 15million tons

however, the flexible film packaging technology is not an innovative technology of the existing film blowing processing machinery in the market. Campin also said that even though the volume consumption of "pallet packaging" film products market has increased significantly, based on the increase of stretched film production capacity, it is predicted that the operating utilization rate of stretched film processing capacity will remain below 80%. Therefore, for all competitive products, the pressure to obtain processing profits will be greater and greater. Obviously, the market supply structure will be greatly adjusted. At the same time, a certain number of manufacturers engaged in processing shrink sleeve film and elastic outer packaging film may withdraw from the market competition of "pallet packaging" products due to market monopoly, financial crisis and other reasons

according to the prediction of the applicable market information consulting company, due to the improvement of the elastic film packaging technology and the reduction of the weight of packaging materials, the elastic film packaging products will take the lead in gradually eroding the original market share of the shrink film, and will completely replace the latter and be applied to the field of packaging pallets. The promulgation and implementation of the European regulations on the disposal of packaging waste products has prompted the end-users of packaging products to minimize the weight of the torque measurement range of secondary packaging products generated and discarded. It can be seen that this is more conducive to the promotion and development of the technology of elastic sleeve film and elastic outer packaging film, rather than recommending the use of thick wall shrink sleeve film products

1 technical advantages of telescopic film packaging

BEUMER maschinenfabrik (located in bekum), Germany, is a professional manufacturer engaged in manufacturing goods pallet handling and storage equipment. Robert stoppel, the company's regional sales manager, said: "compared with the traditional elastic outer packaging film and shrink film processing machinery, the acquisition of Haier New material processing equipment by the elastic film company has a much higher processing productivity." Per lachenmeier, President of lachenmeir packaging machinery factory in Denmark, said that compared with the shrink film packaging technology that needs to be heated, the cost of the elastic sleeve film packaging technology is lower, and each packaging unit can save about 4 euros in the cost of gas lamps. And the traditional elastic outer packaging film can not produce a balanced clamping force on the pallet, but the elastic sleeve film has this function. In addition, the single-layer elastic sleeve film surface has good bar code readability, and has the trademark identification function of well protecting packaging items. Interbrew factory, a joint venture of Brewery Group in lefin, Belgium, used elastic sheath film, shrink sheath film and elastic outer packaging film to pack beer and canned goods pallets for comparative tests. Nico van tilt, an engineering technician at Interbrew factory, said that the factory is preparing to replace a new packaging system. The shrink sleeve film packaging system currently used has many problems in the use process, such as the location of the pallet where the film is not tightly wrapped, or the end of the loose film is bonded to the shelf of the warehouse. Since the shrink sleeve film is fixed under the lower part of the pallet, the film needs to be perforated before the forklift can remove the whole pallet from the packaging production line, and the stability of pallet packaging will be lost. Therefore, shrink film packaging technology is no longer considered

nico van tilt also said that consumers using our products will feel value for money, which is also crucial. The packaging tray with excellent weather proof performance is a critical issue. The thickness of the film is 40m, which is not much different from the elastic outer packaging film. However, the elastic sleeve film has a fixed single pallet packaging cost. When elastic outer packaging film is used on other equipment, especially when manual packaging is used, packaging operators often use additional film packaging layers, which is only for safety reasons, so the cost of each pallet packaging is increased

2 influence on the global market

lachenmeier said that at present, the application of elastic sheath packaging technology is increasing in a small part of Europe and Asia. Lachenmeir packaging machinery factory is actively exploring the North American market. The equipment manufacturers there hope to convert cardboard packaging into elastic film packaging, which can save $5 per packaging unit, which is equivalent to half of the packaging cost

he also said that in the transportation chain of packaging products, an important factor is to identify where scratches occur. These packaging products need to be separated before they are sent to consumers

consumer users have been complaining about the defects of cardboard packaging. For example, the adoption of cardboard packaging system requires more employees, and sometimes some products damaged during transportation have to be brought back for replacement. Elastic sheath packaging can eliminate these costs, and any damage can be seen before the goods arrive at the retailer. In addition, the markets in other packaging fields in North America show that the elastic film packaging technology can also be applied to the chemical products and cement industries, and the filling temperature of the elastic film is also the same as that of the paper bag hot filling cement

ExxonMobil is optimistic about the application prospect of elastic sleeve film recently, providing plastic processing plants with coextrusion film processing materials that can improve film properties. The first resin of nexxstar brand series was launched in December, 2004. It is said that it can be applied to current packaging production equipment, and the processed film products have the advantages of cost-effectiveness, high toughness and improved optical properties

used in the three-layer coextrusion blown film processing system, its inner layer adopts the EVA copolymer of escorene ultra fl00111 brand (VA content is 7.5%); The outer 2 layers adopt excel1018ca Metallocene Linear low density polyethylene (mLLDPE); Its composition ratio is 1:3:1, and its film thickness depends on the size of the load and the size of the tray. EVA can make the film have excellent elasticity and heat sealing fastness, while mLLDPE gives the film wear resistance, puncture resistance and high transparency

the above discussion is a corner of the general view on the elastic sheath packaging technology published in the famous industry business journal modern plastics, but it gives us a clear view. However, consumer users who are interested in this technology are still skeptical about the repeatability problem. Therefore, it is necessary to produce packaging products with higher technical content

at present, elastic outer packaging film still occupies the leading position of pallet packaging. The working principle of stretched film is that the elastic outer packaging film has to wrap around the tray under tension. With the help of memory, the film will try to restore its original shape, so that the trays can be firmly fixed to each other. The packaging method of this pallet has two operation modes: manual and automatic. Among them, the stretching film with manual operation accounts for the vast majority, accounting for more than 70%

another method of packaging pallets is to use heat shrinkable film, which is to first use a plastic film with a size larger than the pallet to load the goods into it, and the film will shrink after heating with flame, hot air or hot pipe. Through the contraction of the film, the goods are firmly tied together. This packaging technology can be completed by manual or automatic production lines. In recent 8-10 years, a new type of pallet film packaging technology has been developed under the close cooperation between packaging machinery manufacturers and polyolefin manufacturers. This has brought revolutionary changes to pallet packaging, making pallet packaging more sealed, firmer, cheaper and faster

3 working process of film packaging machine

when a pallet is loaded with goods, enter the film packaging procedure. The roller conveyor is also an important driving factor, or it can be directly moved to the elastic membrane equipment with a crane. Note that the tray is placed on the base. Due to the use of the base, the machine can make the elastic membrane cover the tray, so that the tray is almost completely sealed

once the tray is placed on the film wrapping machine, the electronic eye will measure the height of the tray, and then some more complex elastic film lines will also measure the size of the tray. After obtaining the measurement information, the packaging machine decides to choose which type of elastic sleeve (in the machinery introduced in this paper, there are two types of films placed on the packaging line). It should be noted that the elastic sleeve of one size can pack several forms of pallets, but if the size difference is too large, it needs to use different sizes of films (for example, for 60 × 80cm and 110 × 130cm tray, preferably two different forms of tubular elastic sheath film)

according to these size information, the packaging machine will copy the exact length of the required film. Once the limit length is reached, the film begins to seal at the top and cut the roll. Then the mechanical stretching arm placed at the four corners of the tray stretches the film. This process is very important and is the key to the final quality of the packaging tray. If the position of the stretching arm is incorrect, the elastic sleeve film will wrinkle and show different packaging quality on the four surfaces of the tray

if an appropriate resin formula is used, the film stretching rate can be increased to more than twice the original in the process of stretching the sleeve film. Therefore, when the same elastic sleeve film is applied to several different pallets, the elastic sleeve film has great adaptability because of its large tensile ratio, and can also obtain the desired sealing strength. When the film is stretched beyond the size of the tray, put the manipulator into the bottom of the tray, so that the elastic sleeve film can accurately wrap the tray completely, and then the elastic sleeve film is separated from the manipulator, and the film will soon return to its original state, and the tray will be tightly clamped together. The smaller the size of the original elastic sleeve film, the greater the clamping tension on the tray. For some applications, you want to have the maximum tensile clamping force (such as the packaging of building brick trays), but for other applications, you need to try to avoid excessive tensile clamping force (such as the milk tray using too much tensile clamping force, which will deform the packaging box). Then the manipulator lifts again, and the pallet is transported away from the elastic sheath packaging line. The packed pallet is stored in the warehouse and ready for transportation

in order to obtain the maximum profit on the elastic sheath packaging line, use high-quality tubular elastic sheath film, so you will have the best packaging production line, but if there is no suitable film on the production line, it will