How to choose hot melt adhesive particles for paper straw roll bonding? List of 7 items for food contact and acceleration

Paper straw roll adhesive selectionSpecially designed to meet food contact requirements, with fast initial adhesion and low odorHot melt adhesive pelletsThe straw rolling line has a fast speed, narrow overlap surface, and the glue must grasp the paper tape within 1 second. At the same time, it can withstand the low temperature and long-term soaking of cold drinks. The direct consequence of choosing the wrong one is that the straw will dissolve after soaking for ten minutes, or the drink will have a sticky taste.

List of 7 essential items to check for selection

• Compliance qualificationsRequest relevant testing reports and MSDS for food contact materials, specifying that they can be used in indirect contact scenarios.
• odor levelLow odor formulas are given priority, and those in a pungent molten state are excluded.
• Initial adhesion speedThe opening time should be controlled within 1-3 seconds to match the lap cycle of high-speed pipe winding.
• Water resistanceSoak the finished product in 4 ℃ cold water for 2 hours and room temperature water for 30 minutes without opening the glue.
• low temperature resistanceThe cold drink scene needs to be verified in an environment of -5 ℃ to 5 ℃ to avoid brittle cracking of the adhesive layer.
• colorLight or transparent colors are preferred to avoid color transmission on white/printed paper tape.
• The amount of glue can be controlledModerate viscosity, thin and continuous glue line, preventing overflow of glue wheel.

4 practical points for speeding up production

How to calculate the cost so as not to suffer losses

A single paper straw consumes very little glue, and negotiating the price per ton is not meaningful. What really affects the cost isScrap rate and downtime for cleaningA line is shut down three times a day for cleaning due to glue overflow, and the losses often exceed the price difference of the glue used. Suggest comparing different models based on the comprehensive glue cost per 10000 straws plus downtime losses.

Sunlife’s supply method

Sunlife Hot Melt Adhesive from Guangzhou Sunlife Trading offers low odor and light colored models for food packaging. We can provide temperature and opening time recommendations based on the customer’s tube rolling machine model, and support sending samples to our own production line for one shift verification. Batch customers can provide batch by batch testing data for easy inclusion in the warehouse acceptance process.

Frequently Asked Questions

Q: Can ordinary sealing rubber particles be directly used to make paper straws?
Answer: Not recommended. The ordinary sealed box type is not designed for food contact and water resistance, resulting in higher odor and compliance risks.

Q: The straw dissolves when soaked in water, is it necessarily a problem with the glue?
Answer: Not necessarily. It is also possible that the paper tape has a low basis weight, insufficient overlap width, or inadequate compression. The process should be checked before replacing the adhesive.