How to choose hot melt adhesive in summer and winter? Choose summer glue and winter glue based on temperature resistance (Sunlife dual season inventory)

Hot melt adhesive is a thermoplastic material – it “softens when heated and hardens when cooled” is a physical norm, not a quality issue. So for the same model, the back of the book may become sticky at 35 ° C in the summer warehouse, and it may crack and peel at -5 ° C in winter. Choosing the wrong seasonal glue, even the best binding technique is useless. Below, explain how to choose between summer glue and winter glue according to “temperature”.

1、 Why is hot melt adhesive seasonal

The softening point and low-temperature toughness of hot melt adhesive are mainly determined by the formula. Ordinary glue is prone to two types of problems at extreme temperatures:

• High temperature in summerSoftening of the adhesive layer, sticking of the book back, adhesion of the book opening after stacking, and even opening of the adhesive during transportation;
• Winter low temperatureThe adhesive layer becomes brittle, the impact resistance decreases, and it is prone to cracking and scattering when flipping or falling.

Sunlife is therefore equipped withSeasonal adhesiveTwo lines:Summer glue(Resistant to about 35 ℃) by improving heat resistance to withstand high temperatures;Winter glue(Resistant to about -5 ℃) by improving low-temperature toughness to resist brittle cracking, and regularlyDual season inventoryTo cope with seasonal production changes.

2、 Select model based on ambient temperature

The comfortable range reference for workshop environment: temperature of 15-26 ℃ and humidity of about 50% are relatively stable; When returning to the southern sky and during the harsh winter, it is necessary to adjust the temperature accordingly, and not just rely on changing the glue to “force it”.

3、 Three easily overlooked points

1. Do not mix different brands/batchesDifferent formula systems may result in incompatibility and abnormal adhesion when mixed.
2. The adhesive groove should be cleaned regularlyClean once every two weeks to prevent residual glue from carbonizing (carbonization not only affects bonding, but also poses a risk of fire).
3. Upgrade viscosity when old/high-density materials are difficult to stickNot all ‘not sticking firmly’ is the fault of the glue – Sunlife training data shows that,About 90% of after-sales service is caused by equipment temperature control failure(Displaying 160 ℃ but actually only 100 ℃), calibrating the temperature of the glue pot with a thermometer is often more critical than changing the glue.

4、 Seasonal glue and “seasonal batch number” are not the same thing

Someone may ask, ‘Can we use the same batch number in summer and winter?’batch number managementAngle (corresponding to Sunlife’s other seasonal adhesive list). This article is aboutSelect the model based on temperature resistanceIf your usage or storage environment crosses the temperature resistance boundary, you should use summer or winter glue instead of worrying about whether the same batch number can last for two seasons.

Frequently Asked Questions

Q: I don’t have air conditioning in my warehouse, how can I choose in summer?

A: Prioritize summer glue (resistant to about 35 ℃), and try to store the finished product in a cool and ventilated place, avoiding direct sunlight and prolonged stacking.

Q: In winter, when the back of a book is flipped over, it cracks. Can’t it be glued?

A: First, check if the temperature control of the equipment meets the standard (temperature gun calibration), and then confirm if winter glue has been used; Low temperature brittleness is often caused by the combination of insufficient temperature and failure to use winter formulas.

Don’t beat your head when choosing seasonal glue, fill in the “use temperature+storage and transportation temperature” columns clearly first. Sunlife has dual season inventory of summer glue (resistant to about 35 ℃) and winter glue (resistant to about -5 ℃) – tell Sunlife your environmental range and match the model and process card according to the temperature resistance, which is much more stable than guessing the glue based on the season.

*This draft is for official website SEO and is awaiting manual review. The temperature range, bi seasonal inventory, and 90% equipment temperature control failure are all sourced from the Sunlife training material index and are not fabricated; The original index expression is “about 35 ℃/about -5 ℃”, and the accurate process values are subject to the accompanying process card. The content scope is limited to hot melt adhesive lines and does not involve skinning. Overlapping risk warning: Adjacent to the “Seasonal Adhesive List” in 2313, but this article focuses on “selecting models based on temperature resistance” from a different angle. Please determine whether the project is approved as NEW. ）*