How to match the curing speed of hot melt adhesive particles with the machine speed? Comparison and evaluation of fast fix and slow fix

Matching principle in one sentence:The faster the machine speed, the faster the required curing and the shorter the opening time; If the machine speed is slow or the workpiece is large and needs to be aligned over a long distance, it should be fixed and opened slowly insteadChoosing the wrong direction is either due to poor adhesion or loose edges during wire drawing, and cannot be repaired by adjusting the temperature.

Comparison between fast solidification and slow solidification

Sit in place according to the process

• High speed sealing line (over 30 boxes per minute):Fast curing type, equipped with short dispensing and sufficient roller pressure, focusing on whether the curing time can keep up with the conveying rhythm.
• Wireless adhesive binding (40-80 books per minute):Medium opening hours 6-8; s， We need to leave time for the glue to penetrate the paper fibers, as blindly pursuing speed will cause it to float on the surface.
• Quick printing of graphics and text in small batches, switching between multiple specifications:Slow fixation, high fault tolerance, and the operator can manually connect the threads in time.
• Large format cardboard boxes, irregular colored boxes:Slow solidification, the adhesive should not lose its adhesion in advance during the long-distance compression process.

Three on-site signals for determining whether they match

• After tearing, the adhesive layer appears as a smooth surface that is not wet or sticky. If the opening time is too short and the adhesive has already formed, it should be pressed together. Slow curing or reduce the machine speed should be used.
• After compression, the workpiece can still be pushed, but the edge overflows with glue. If the curing is too slow, it should be replaced with a fast curing or extended compression section.
• Spray nozzle drawing, intermittent glue line → viscosity and curing combination imbalance, first check whether the operating temperature falls within the recommended window.

Four step verification method for gear shifting

• First, fix the variables.Only change the adhesive, do not touch the temperature and machine speed, run 50 pieces as a benchmark to avoid judgment distortion caused by several parameters changing at the same time.
• Fine tune the temperature again.Adjust 5 within the recommendation window each time; At ℃, observe the uniformity and penetration of the adhesive, and do not jump 20 degrees at once; ℃.
• Then increase the speed of the machine.Raise the target rhythm step by step, conduct random inspections on peeling and appearance in each step, and immediately revert back to the next step if there is any virtual adhesion.
• Finally, write it into the process card.Record the stable running temperature, machine speed, pressing time, and adhesive consumption, and follow this card when changing shifts and personnel.

Frequently Asked Questions (FAQ)

Q: Can we increase the temperature to make slow solidification faster?
Answer: No. Heating only reduces viscosity, but prolongs the time of loss of viscosity and accelerates carbonization, which is a typical reverse operation.

Q: How to choose between running multiple tasks on one line?
Answer: Choose the main adhesive according to the largest proportion and the most tight rhythm of the live parts, prepare another one to deal with special live parts, and write the switching rules clearly on the process card.

Sunlife provided by Guangzhou Sunlife Tradinghot melt adhesiveAccording to the opening time, corresponding grades can be recommended based on your model, machine speed, and compression section length, and initial parameters for temperature machine speed comparison can be provided to reduce machine trial and error.