How to interpret the numerical meaning of hot melt adhesive models? What do 292, 296, 391, and 39B represent respectively

When purchasing hot melt adhesive, many customers are confused by the model: “What is the difference between 292 and 296?” “Why can 391 be spread evenly?” “What kind of adhesive is 39B? These numbers are not randomly assigned serial numbers, but are produced by the manufacturerUsage segment+product positioningThe coded code. The naming rules of different manufacturers are not the same. This article takes the actual models sold by Sunlife (Sunlife) as an example to explain how to read this set of numbers and what to look for when selecting.

1、 First of all, let’s answer directly: The number is read as “purpose segment+positioning”, not a performance parameter

The numbers in the hot melt adhesive model,It does not represent the temperature resistance or viscosity——Those need to refer to the detection parameters in the technical documentation. The model is essentially the manufacturer’sProduct segment codeTaking the Sunlife real model table as an example: the first two digits basically correspond to the paper/scene system, and the following digits or letters correspond to the division of labor or specialized positioning of the back glue/edge glue.

2、 Sunlife real model segmentation (from training materials and on sale models)

Note: The model names vary from factory to factory. The above is the segmentation rule of Sunlife/Sunlife system, and the specific information provided with the goods shall prevail.

3、 The four most frequently asked questions by customers

Q: What is the difference between 292 and 296?

Belonging to the adhesive section of bound paper books and magazines, the difference lies in positioning and formula: 292 is more economical, meeting conventional fastness requirements; 295/296 is the main cost-effective segment, suitable for a wider range of paper and vehicle speeds. Which one to choose depends on your paper and production line requirements,It’s not ‘bigger numbers are better’The specific parameters are subject to the model technical data.

Q: Why can 391 be evenly distributed?

Flattening comes from the flexibility design of the formula (positioned as high-end flat adhesive), not just “flat with a number of 9”. Books and periodicals that require a 180 degree open layout (such as business notebooks and open reading books) must be considered before 391, and must be verified with a sample first.

Q: What kind of glue is 39B?

The main model for bonding pearl cotton (EPE) foam material. Pearl cotton glue and book glue have different application systems and usage temperatures (book glue is about 160-180 ℃, pearl cotton glue tank is 140-160 ℃),Do not mix two types of adhesives。

Q: Why do we need to separate the models of backing glue and edge glue?

The back glue (book back) tube is firmly formed with the book back, and the edge glue (book mouth side) tube is positioned and assisted with fastness. The function, formula, and opening time design are different, so 298/398/29B are separately made with edge glue models (how to match edge glue back glue, see separate article).

4、 Selection sequence: Set the scene first, then determine the model

Numbers are just codes, selection is based on“Scene → Paper → Vehicle Speed → ModelHere: First confirm whether it is book binding, graphics, packaging, or pearl cotton, and then match the appropriate model according to the paper (copperplate paper/adhesive paper/double adhesive paper/thin paper) and vehicle speed – how to choose different paper, see separate article. When there are multiple models in the same scene, the parameters and sample verification results in the accompanying “Instructions/Process Card” should be used to determine, without guessing based on the size of the numbers.

5、 Relationship with Sunlife’s real business

Sunlife (Sunlife) hot melt adhesive is manufactured by Foshan Jucai Base, specializing in adhesive for book and magazine binding. The models cover real sales segments such as 292/295/296/298, 396/397/398, 391, 393/395, 39B/399, 39D, etc. Instructions and process cards are provided with the goods. When the customer reports that the model cannot be obtained on time, they should inform the salesperson of the paper, vehicle speed, and book thickness, provide direction according to the real model table, and then verify with a small sample – this is the standard process supported by Sunlife’s daily selection.

Explanation: The model positioning in this article is based on Sunlife training materials and the on sale model list; The specific performance parameters of each model shall be subject to official technical data. In case of performance doubts, please refer to the actual test sample.