HDPE is the material of choice for very high requirements concerning heat sealing. TYVEK 1073B from DuPont is such a material. But it needs a high sealing temperature. SURLYN is a copolymer of ethylene and acrylic acid neutralized by Na or Zn. This material needs a lower sealing temperature but it is not as safe as HDPE materials. I would doubt if a PP homopolymer is flexible enough for packaging. PP random polymers like EP, EPM or EPDM have not enough crystallinity to be stable at slighly elevated temperatures so that they are also not suitable for packaging.
Thanks for your attention Dr. Koehler.
Originally, I prepare thin films of HDPE/LLDPE (60/40) blend by extrusion process. Then I connect two edge of film together through thermal and compressive welding process. But the weld line is not strong enough. So I look for an alternative polyolefin to replace HDPE which presents stronger weld line. Also, is EVA a good additives for improving HDPE/LLDPE blend weld line?
I think that EVA could be a good choice. Other alternatives are Lotader xxxx (xxxx stands for a four-digit number, ethylene-acrylate-maleic anyhdride-copolymer), Lotader AX xxxx (ethylene-acrylate-glycidylmethacrylate-copolymer), Surlyn, JSR RD (syndiotactic 1,2-polybutadiene, semicrystalline, can be also blended with PP or PE) or Elvaloy® HP4051 (ethylene-carbonmonoxide-butylacrylate-copolymer). I could imagine that the syndiotactic 1,2-polybutadiene (available from JSR, Japan Synthetic Rubber) would be the best choice.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials Chemistry
- Polymer Chemistry