mingye packing

  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...