mingye packing

  In our lives, we often see the use of  stretch film  to package items, the packaging of stretch film is very tight, enough to surface the good quality of the product. Generally, we must go through a stretching operation before using a stretch film for packaging. Many users do not understand why it is stretched. Today, the joypack stretch film manufacturer will introduce to you why the stretch film needs to be stretched before use. 1. The packaging of stretch film must be stretched. The stretch form of pallet mechanical packaging includes direct stretching and pre-stretching. There are two types of pre-stretching, one is roller pre-stretching, and the other is electric stretching. Direct drawing is completed between the tray and the drawing film. The drawing rate of this method is low, about 15%-20 %, if the stretch ratio exceeds 55%-60%, then the stretch of the stretched film will be exceeded, the width of the stretched film will be reduced, the perforation performance ...

  When packaging, stretch film is a very useful tool. Its stretchability is very good. It can also be easily wrapped for items of different shapes, but we will find that when we use stretch film The shrinkage properties of different stretched films are also different, so what causes this situation? Today, joypack  stretch film manufacturers  will introduce to you the reasons for the different shrinkage properties of stretch films. 1. Aluminized transmission occurs when aluminizing, and coating moves when applying glue. The main measure to prevent corona on the back of the stretched film is to adjust the pressure of the rubber squeeze roller in front of the corona treatment roller and the pressure at both ends of the squeeze roller. It must be consistent, and the pressure must be appropriate. 2. Polyester is a polar compound with high surface free performance, and the surface wetting tension is more than 40 factors/cm. However, for high-speed color printing, or in order to...

  The main function of the stretch film is to pack the goods together and wrap the scattered goods together to prevent the loss of the goods. This kind of stretch film packaging material is suitable for the logistics industry. In addition, the stretched film is moisture-proof and scratch-resistant, and is extremely protective because the tightness of the stretched film can protect the article. Today, the joypack   stretch film  manufacturer   will introduce to you what are the factors that affect the tightness of stretch film. 1. Non-polar polymer, the surface freedom of the stretched film is small, and the tension is low, generally about 30 dyne/cm. 2. Polyester, polyethylene terephthalate, polyethylene terephthalate, PETG are polar polymers with high surface free energy and surface wet tension higher than 40 dyne/cm. 3. The transfer of the aluminized layer will occur when aluminizing, and the transfer of the glue layer will occur when applying glue. Especially...

In the production process of PE stretch film, temperature control is a very important factor. Temperature has a greater impact on the production of stretch film. If the temperature is not well controlled, the quality of stretch film is prone to problems. Therefore, attention should be paid to temperature control and autoclave aeration control during the production process. High-temperature and high-pressure steam curing can remove the free water in the PE stretch film, and the particles of the embryo body can shrink together, which can effectively reduce the rapid evaporation of water, which will cause thermal expansion and damage. So what matters should be paid attention to for temperature control during the production of stretched film? 1. In the production heating stage, pay attention to ensuring that the PE stretch film blank is not affected by steam, and shorten the heating time as much as possible, as long as the steam is continuously and uniformly sent to the curing chamber for ...

  The air permeability of the stretch wrapping  film is one of the important properties of the stretched film. The correct adjustment method is to adjust the amount of LLDPE to a suitable viscosity, and you can also add PIB or other master batches. It takes a period of time to move out, but it is also affected by temperature. When the temperature is high, the viscosity is strong, when the temperature is low, the stretch and viscosity are low. The viscosity of the stretch film is greatly reduced after stretching, so a certain temperature needs to be controlled, and the air permeability of the stretch film also determines its quality Important indicators. How to improve the breathability of stretch wrapping film? Generally speaking, the gas permeability and gas permeability coefficient are the main indicators to measure the permeability. The gas permeability at a constant temperature determines the air permeability of the film. You can also use the test to set a high-pressure ch...

In industrial production, the tackifier for   polyethylene  stretched   films   can make low-molecular-weight polyisobutylene (PIB), ultra-low-density polyethylene (VLDPE) with a density lower than 0.905, and ethylene-vinyl acetate copolymer (EVA). PIB, as a tackifier for polyethylene stretched film, has a wide range of viscosity adjustment, convenient adjustment and obvious price advantages. Stretch film requires excellent peel adhesion and excellent lap adhesion. The higher the peel adhesion, the smaller the possibility of opening the tray. The better the sealing performance of the stretch film. The stretch film is only affected by the longitudinal direction. The less likely it is, so in order to obtain a strong package, the peel adhesive of the stretch film needs to be balanced. 1. The influence of molecular weight on the adhesion of stretched wrapping film Different molecular weights will lead to different adhesion, high molecular weight polyimide will make ...

  Nowadays, mechanized production is becoming more and more widespread, even for product packaging, machines are used. Stretch film packaging machines are commonly used. Only in this way can the entire industry develop healthily and produce high-precision, specialized large-scale complete production lines. To meet the demand for packaging machinery. So what is the  stretch film  suitable for packaging machines? 1. First of all, the viscosity must be strong enough, and it needs to use polyvinyl resin and special tackifier additives, with a strong adhesive stretch film. 2. Strong tensile force. Because the tensile force of the stretch film packaging machine is greater than the manual force, the requirements for the stretch film itself are also relatively high. High elastic raw materials must be used to ensure that the proportion of the stretch film processed is as high as 1 : 5, which is twice the normal film. 3. Choose a stretch film with strong puncture resistance, high f...

  Stretch film   is widely used in industrial production. The most effective protection of stretch film for products is its most basic function. If stretch film does not have a reliable maintenance function for packaged goods, then it will lose its application as a packaging product. The value of this is a failure in the selection of materials. The maintenance function of stretch film for goods is also diverse. Different commodities have different packaging methods, and the focus on the maintenance function of stretch film is different. Let me introduce the main functions of stretch film: 1. Good mechanical maintenance effect Good mechanical maintenance effect, avoiding the leakage of the goods in the package or the damage or contamination of the goods caused by foreign matter entering the package, which can directly reflect the mechanical maintenance function of the stretch film. The higher the strength of the stretch film, the stronger the tear resistance. The greater the pu...

  Many users who have used stretch film should know that the quality of a stretch film directly affects the user’s experience. If the quality of the stretch film is not good, the packaged product will not be firm, so that it will be transported Damage will occur during the process. What are the factors that affect the quality of  stretch wrapping  film ? Today Joypack will give you a detailed answer: In different industries, stretched film has also been widely used, usually in the three-layer co-extrusion casting process. Use imported linear low-density polyethylene as the production material. The product can reach the leading level in all indicators, and has good stretch film ability and transparency, and also has strong tear resistance. It can also be self-adhesive under normal temperature. Therefore, The scope of application is extremely wide. The use of stretch film to package products can minimize the cost and enable the use of box packaging in batches. This virtuall...

  The polyethylene blend of   pe stretch film   should be hot-filled at 100 degrees Celsius, and even if it does not break under the tension of the filling, it will have a larger stretch deformation. Usually, the liquid filling film has high temperature resistance and good strength co-extruded stretch film, such as: Although the inner layer of adhesive resin is still PE material, the outer layer is nylon film, which has high heat resistance. The strength is high, and the fuse machine cannot be used to fuse and fuse the bag. The PP/EVA/PE co-extruded film can be fused, but the heat sealing temperature is between 190-200 degrees Celsius, and the thickness should be appropriately increased to 80-90μm to ensure the strength of the composite film. Another reason for the breakage of the stretch film is caused by excessive tension. The solution is to reduce the tension of the packaging machine. In fact, after sterilization at 100 degrees Celsius, properly cool it down and reduce...

 J oypack is a professional   stretch film manufacturer , providing high-quality stretch film products and competitive prices. After we buy the stretch film, we need to store it when it is not used for a long time. However, many times we find that some stretch films have turned from the original transparent color to yellow. What is the reason? Strictly speaking, the stretch film has only two colors, colorless and colored. The main reason for the light yellow is DOV, color masterbatch and other additives or processing technology changes. If the color is light, the stretch rate and self-adhesiveness are not affected. If it affects, you can continue to use it. If the color is unnatural, the quality will be poor. The stretch film technology has developed to now have been very mature, some manufacturers will try to change the formula to produce stretch film with different properties. It is mainly reflected in three aspects: color, stretch rate and self-adhesiveness. A single color ...

  joypack is a professional   stretch film manufacturer , providing high-quality stretch film products and competitive prices. Nowadays, many companies do not know how to judge whether the viscosity of the stretch film is sufficient when they buy stretch films. Today joypack will introduce you to the method of judging the viscosity of the stretch film. 1. The influence of molecular weight on the viscosity of stretched film: the molecular weight is different, the adhesion performance will be different, the film with high molecular weight has higher adhesion, but as the molecular weight of PIB increases, the adhesion will decrease; If it is low, the viscosity retention time is too short due to its relatively easy volatilization. Therefore, selecting PIB with appropriate molecular weight can make the stretched film have a better viscosity. Studies have shown that PIB with a number average molecular weight of about 1300 is more suitable for increasing the self-adhesiveness of stre...

  The main raw material of   PP strapping roll   is polypropylene, and it is a kind of net-like packaging material after heating, lubricating and stretching and cooling it. However, in this manufacturing process, there are some factors that will have a greater impact on the quality of the entire package, such as length, elongation, tension, bending, etc. If the tension is equal to the parameters, the longer the cost, the lower the cost.  PP strapping roll  is a kind of plastic product with relatively light weight. If it is made as a strapping belt, its use range will be more extensive. In appearance, the main color of PP strapping belt is translucent or opaque. It belongs to the film category and can burn directly in the flame. When the  PP strapping roll  leaves the flame, it will slowly and gradually extinguish or continue to burn. During the combustion process, the upper part of the flame is mainly yellow, and the lower part is mainly blue, and ther...