Knowledge points regard MODPE
1, MDOPE film, that is, MDO (unidirectional stretch) process produced by the high stiffness PE substrate polyethylene film, with excellent rigidity, transparency, puncture resistance and heat resistance, its appearance characteristics and BOPET film is extremely similar to the ability to realize the PE and PE composite, thus creating 100% of the polyethylene material composition of the flexible packaging in the recycling does not need to peel off the different plastics, the When recycling, there is no need to peel off different plastics, which greatly reduces the complexity of the process. This innovation breaks through the limitations of traditional composite flexible packaging made of many different materials that cannot be recycled, and it is a great leap forward in flexible packaging technology.
MDOPE films are divided into three series:
MDOPE-T general type series,
MDOPE-E high-barrier series,
MDOPE-S ultra high barrier series;
With its good flatness and printing performance, excellent thermal stability and low shrinkage, MDOPE film can now be used as a printing film for eight-side seal bags, suction nozzle bags and zipper bags.
2. GRS certification stands for Global Recycled Standard.
It is an international, voluntary, whole-product standard designed to ensure that the recycled content of products is accurately labeled, and to guarantee that products are manufactured in accordance with specific environmental and social responsibility standards.
It is an international, voluntary, whole-product standard designed to ensure that the recycled content of products is accurately labeled and that the production process meets specific environmental and social responsibility standards.
GRSPE(with recycled pe)
Since 2022, Shanghai Xiangwei Packaging Co.,Ltd have been conducting research into the printing of recyclable mono-material bags, and we have accumulated a wealth of experience and a mature, industry-leading position in their application.
The main difficulty of single material comes from bag making, which requires the cooperation of subsequent processes. MDOPE material needs to have a certain temperature difference with the base film in order to stabilize the bag making.
In terms of printing, attention needs to be paid to overprinting, ink adhesion, drying effect (residue and countersticking). Material eveness and tension control.
In the composite, the same need to control the tension, drying temperature, drying air volume as large as possible, the use of high-density glue shallow net roll process is better.
Bag making is the key step, bag making on the heat sealing knife to do non-stick treatment, try to low temperature and high pressure mode of production;
When purchasing materials, we should ensure that the temperature difference zone of the thermal melting point of the fabric and base material should be large;
Control the tension of pulling material when making bags, the smaller the better;
Layout as wide a side as possible as the vertical, if the bag is small plate making as many rows as possible, to avoid walking the material film is too narrow;
Do zipper bags when choosing special low-temperature zipper, to avoid zipper head burst.
At present, the industry generally believe that the MDOPE film temperature resistance is good, the bag type is more flat, easy to control the curl.
The lining PE material must be selected according to the specific situation, for example, if you need good barrier properties, you can choose EVOH-PE or milky PE.
If there is no special requirement, you can choose the commonly used LDPE！
ADVISES
1.Try to hit the easy-tear line when the customer's expense supports it.
2.Before accepting the order (according to different bag types), it is explained that the PE//PE structure of the bag body flatness is a little worse than other materials (you can take a recent video of similar bag type to explain!) The body of PE//PE structure is less flat than other materials (you can take the recent video of similar bags to illustrate!
Single material recyclable packaging is certainly the trend, color printing enterprises to do a good job of technical reserves is a must, it is recommended that the following two areas to try first:
1、Frozen Packaging
Use single-pull PE instead of PET and nylon BOPA to produce single PE material for freezer packaging, especially for freezer packaging that does not require high barrier performance.
PE instead of nylon, in the puncture resistance, tear resistance will be reduced, but can meet the requirements of frozen packaging, for most customers can consider iteration. If PE is used instead of PET, the cost increase will be higher. Overall, the thicker the bag the higher the cost of replacement for sure.
2、Normal temperature and short-term preservation products
Color printing enterprise can start from room temperature, short guarantee product packaging, first familiar with the material and process, waiting for the material to further mature.
At the same time, in terms of process, should also pay attention to:
Production of single material packaging, the fewer variables to be the better.
For example, xiangwei packaging Specialized printing machine printing PE, the effect is very good, tension can be controlled very fine, overprinting is very accurate, whether it is lifting and lowering the speed or changing the roll, can be very well controlled. The printing quality with DIC ink is 97% close to the level of nylon printing.
Therefore, in the production of single material recyclable packaging, try to specify the equipment to specialize in production, do not arbitrarily change the production line to ensure process stability and maximize the control of loss. For example, PE material in bag making, and other materials are fundamentally different. This time instead of letting the material to adapt to the bag-making machine, rather than let the bag-making machine to adapt to the material: if to a batch of PE to try once the machine, then the efficiency is too low. On the contrary, specifically for the single PE material packaging research and development of bag-making machine, including heat sealing pressure, heat sealing temperature control amount, etc., can be adjusted accordingly to avoid over-hot or false sealing phenomenon.
Post time: Jun-27-2025
