What is hot melt adhesive S-295? Selection and application points of adhesive backing for bound paper books and periodicals

S-295 is a model used in the Sunlife hot melt adhesive system for “adhesive backing for paper, books, and periodicals”.In the wireless adhesive packaging of books and periodicals, it belongs to the adhesive paper adhesive series along with S-292/S-296/S-298, covering different gear positions and the division of back and edge adhesives. If the factory is doing back coating for ordinary adhesive paper books and magazines (textbooks, teaching aids, regular books), S-295 is one of the models worth checking in the selection list.

Let’s clarify from three perspectives: where it is used, how to distinguish it from similar models, and what to pay attention to when using it on the machine. This will facilitate procurement and binding workshops to quickly determine whether to try this model.

1、 What scenarios is S-295 used in

The wireless adhesive packaging for books and periodicals is divided into two layers: “back adhesive” and “side adhesive”:

• adhesive backingApplied to the spine of the book after being milled and brushed, it bears the main adhesive force and is the key to keeping the pages of the book intact;
• Edge glueApply it to the junction between the cover on both sides of the spine and the book block, mainly to fix the cover and prevent warping.

S-295 belongs toAdhesive backed paper, aimed atAdhesive paper (double adhesive paper/laminated paper) for back coating of books and periodicalsIt is a complementary relationship with its counterparts S-296 (high-end book and magazine back adhesive) and S-298 (book and magazine edge adhesive), not a substitute for each other – one tube back coating main, one tube high demand book and magazine, and one tube side adhesive.

Tip: Which specific book (in terms of weight, whether it is copperplate paper, and whether it requires flat distribution) should be usedConclusion of accompanying process card/sampleTo be accurate. There are many Sunlife models in the same series, and blindly guessing based on model numbers can easily lead to making mistakes.

2、 How to divide labor with models of the same series (not relying on numbers to guess)

Many customers feel dizzy when they see 292/295/296/298, but the division of labor logic is not complicated:

When selecting, first think carefully:Back coating or side coating? Is the paper regular adhesive paper or copperplate paper/thin paper?Select the model in the corresponding position instead of just looking at the size of the number.

3、 Several points to pay attention to when using the computer

S-295, as an EVA hot melt adhesive for books and magazines, has the same key points for machine operation as the entire adhesive system for paper packaging. Common pitfalls lie in the equipment and process, not in the adhesive itself

1. Calibrate the temperature of the glue pot before operating it.The commonly used working temperature for book adhesive is about 160-180 ℃ (subject to the process card). In the training data, ‘90% of after-sales problems come from equipment temperature control failure’ – it shows that at 160 ℃, the actual temperature may only be 100 ℃, and the glue will not stick firmly or draw if it is not truly melted. Suggest using a thermometer to regularly calibrate the glue pot.
2. The spine of the book needs to be milled and brushed.The surface of the adhesive paper is dense, and the glue cannot penetrate without being pulled. No matter how good the backing glue is, it is useless. The degree of fuzzing is based on the visible fibers and a rough and uniform surface.
3. Match the opening hours with the pace.Different machine speeds correspond to different opening time windows (about 15-20 seconds for low speeds, 5-10 seconds for medium speeds, and 2-7 seconds for high speeds, depending on the process card). The selection and machine speed should correspond to each other, otherwise there may be sticking, slow curing, and loose pages.
4. Do not mix different brands of glue, and clean the machine when changing glue.Mixing residual glue from the glue pot with different formulas can affect adhesion. When switching products, it is necessary to clean the machine (see the article “How to clean the glue pot when changing glue or changing lines” in this series).

4、 Do you want to try S-295

If you are doingAdhesive paper for regular book and magazine back coatingMoreover, the adhesive currently used has repeatedly encountered issues with poor adhesion, wire drawing, and incomplete book back. S-295 can be included in the sample list for comparison with S-292/S-296.

Sunlife provides trial machine support for adhesive paper adhesive systems: send samples → make samples on the machine → provide process suggestions according to your paper and machine speed. Which one will be used in the endThe actual sample results of your lineAccurate, not based on model numbers.

Explanation: This article only provides selection instructions for the real Sunlife model system. The specific temperature, opening time, and applicable paper are subject to the conclusions of the accompanying process card and sample; Not to extend unverified statements such as’ all products have passed a certain test ‘.