Can hot melt adhesive particles add their own colorants to adjust the color? A color mixing accident and rescue

Case Background

A factory that makes color boxes, in order to make the sealing glue line and the box of the same color, hides the seams and makes them transparentHot melt adhesive granulesAdd color masterbatch and adjust to deep red. After going online, the glue line became blurred, blocked the gun, and there were also some areas that did not stick, and the entire batch of gift boxes was almost scrapped.

Reason for overturning

The technician found three errors during the review: firstly, poor compatibility between colorants and rubber particles, uneven dispersion, and uneven depth of rubber lines; Secondly, the colorants contain fillers, which increase the melt viscosity and cause blockages when the spray gun pressure is insufficient; The third reason is that excessive addition weakens the cohesion of the adhesive itself, resulting in a decrease in bonding strength.

Rescue action

• Stop adjusting and isolate the remaining color mixing glue to avoid contaminating the entire pot.
• The supplier will customize pre colored adhesive particles according to the color code, ensuring dispersion and compatibility.
• I tried Guangzhou Sunlife TradingSunlife Hot Melt AdhesiveCustomized coloring service, producing the same color glue according to the box color, with almost invisible glue lines and no clogging of the gun, meeting the adhesion standards.

Experience Table

FAQ

Q: Can I try a small amount of color adjustment myself?
Answer: Developing samples is possible, but compatibility and gun blockage tests must be conducted, so do not directly put them on the production line.

Q: Is pre colored glue much more expensive?
Answer: The quantity is similar to self-adjusting, and it also saves on rollover losses, making it more cost-effective overall.

Color mixing: You can play with small samples by adding your own color masterbatch, and hand it over to the supplier for pre coloring during mass production. The glue line is invisible and does not overturn.