PUR hot melt adhesive (Polyurethane Reactive) is a new type of one-component, solvent-free hot-melt structural adhesive. It is cured by moisture in the air and has excellent bonding strength and impact resistance after complete curing. It also has With excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance, it has become the best adhesive for bonding in electronic industries such as mobile phones in recent years.

Factors and solutions that affect the production process during the gluing process of the product:

1. Influence of chemical composition of PUR hot melt adhesive

The amount of certain chemical components of PUR hot melt adhesive directly affects the viscosity of PUR. From the perspective of product performance, we must choose a suitable glue.

2. The influence of different bonding materials

PUR hot melt adhesive has good bonding ability to different base materials, such as rubber, plastic, glass, metal, leather, wood, fabric, etc. For different bonding materials, choose the appropriate glue model.

3. The amount of glue applied

The amount of PUR adhesive layer applied will affect the curing time. If the adhesive layer is thin, the curing time will be short. When the amount of glue applied is large, the moisture content of the cured glue will be relatively insufficient, and the curing time will be longer, which will ultimately affect the bonding strength of the structural parts.

4. Dispensing opening time

The specific time for the PUR hot melt adhesive applied on the sample to be exposed to the air should be based on the parameters of the adhesive. Generally, within one minute or less, the composite bonding effect is optimal. Complete the bonding within the effective opening time to prevent the glue line from drying out due to too long opening time, resulting in poor wetting effect of the glue line and thus affecting the strength of the bond.

5. Pressing

The structural parts after assembly with PUR hot melt adhesive must be pressed together, the time should be no less than 15 seconds, and the pressure should be no less than 3 kg. The purpose is to make the glue form a good glue thickness and glue wetting effect between the two bonding surfaces.

6. Ambient temperature and humidity

PUR hot melt adhesive is cured by moisture in the air. If the ambient humidity is high, the curing time will be short. On the contrary, if the time is long and the ambient temperature is high, it is conducive to the participation of moisture in the reaction, and the curing time will be shortened accordingly.

7. Adhesive surface treatment

Removing oil, dust, paint, release agents, oxide layers and other substances that affect bonding on the surface of the bonded parts will help enhance the bonding effect of PUR hot melt adhesive.

Hot melt glue guns are divided into two categories: manual glue guns and fixed glue guns. Manual hot melt glue guns are also widely used in the industry. According to different production needs, a hot melt glue machine can be equipped with 1-4 hot melt glue tubes and glue guns. So what is special about manual hot melt glue guns? Functional features?

Compared with hot melt glue guns fixed on dispensing equipment, handheld hot melt glue guns have the following 6 unique features:

1. The module design is precise and has a manual switch design, which can provide precise glue opening and breaking effects.

2. Hot melt nozzles of different specifications can be customized according to various application industries and spraying requirements to realize fiber spray, mist spray, strip spray, manual squeegee, etc.

3. Flexible and diverse nozzles, precision machined, suitable glue gun can be selected according to requirements.

4. Unique filter design has good filtration effect and is easier to clean and replace. The nozzle is not easily clogged.

5. Unique protective gear design prevents operators from being accidentally burned while working.

6. It can be matched with ordinary hot melt glue machine or pur hot melt glue machine according to actual product process requirements to achieve multi-functional use of one gun.

As an indispensable part of the glue spraying system of the hot melt glue machine, the hot melt glue hose not only plays the role of transporting hot melt glue, but also has the function of heating and insulation, because the liquid hot melt glue cannot cool and solidify during the transportation process, otherwise Will affect the bonding effect.

Product advantages

The Tron tube used in the inner tube has good flexibility, anti-adhesion and high temperature resistance (up to 250 degrees), which can minimize carbonization; the heating wire and high-temperature resistant wire used in the bracket are evenly wound around the throat The outer wall has good insulation, uniform heat conduction, and high temperature resistance. It uses high-quality insulation materials to ensure the insulation performance of the pipeline.

Beautiful appearance

According to customer requirements, the outer skin of the hose can be customized in different colors to meet the different needs of customers.

There are many kinds of hot melt hoses on the market, and their prices vary greatly. For a product subjected to high temperature for a long time, the quality requirements are relatively high. There may be no difference in poor quality hot melt hoses in a short period of time, but over time, there will be more faults, and they may even be scrapped. When choosing hot melt hose, be sure to choose the best.

Our hot melt glue machine is equipped with a temperature standby setting function, which can set the insulation temperature according to actual production requirements to prevent glue carbonization, reduce power consumption, shorten the heating time due to shift changes or lunch breaks, and prevent the glue from being overheated during breaks. affecting its performance, thereby causing inconvenience. At the same time, the hot melt glue machine also has a temperature over-temperature alarm and power-off protection function. When the actual temperature exceeds the set value, the main power supply automatically shuts down to avoid production accidents.

When operating a hot melt adhesive machine, you need to pay attention to the following points:

1. The temperature should be moderate (150-180°C), and cannot be heated above 200°C for a long time. This will cause damage to the glue, promote premature aging of the hot melt adhesive, and affect the bonding effect. Heating for 40 minutes to 60 minutes before construction , wait until the hot melt adhesive melts into a liquid state before applying.

2. After feeding the hot melt glue tank, close the lid of the glue tank immediately to avoid contamination by foreign impurities; if the temperature is appropriately lowered to 120°C during a break, just keep the temperature in the heat preservation state.

3. When you get off work every day, in addition to turning off the power of the machine, put two pieces of cold glue into the glue tank to promote cooling and speed up heat dissipation.

4. If the machine is used for a period of time (such as 6 months), the nozzle, hose, and melt tank should be cleaned regularly with special cleaning agents to avoid impurities or carbon deposits from affecting the construction of the machine. Please refer to the product's operating guide before use.

The nozzle is the part of the hot melt glue gun that is responsible for dispensing glue. It is also an important part of the hot melt glue machine accessories. If the glue spray is blocked due to improper use of the hot melt glue gun, it will greatly affect the work efficiency. So how to clean the hot melt glue gun nozzle?

1. Use a smokeless hot air gun to heat it, and then wipe it clean with a clean cloth.

2. Soak the nozzle in the detergent. If possible, use ultrasonic cleaning.

3. Soak the nozzle in an appropriate amount of chemical cleaning solvent to clean foreign matter containing iron, aluminum and other metals.

In order to ensure the normal production efficiency of the hot melt glue machine, please clean the hot melt glue machine's glue tank, hot melt glue tank and hot melt glue gun regularly.

When choosing a high-quality hot melt adhesive machine, attention should be paid to the following aspects:

1. Quality and Durability: A high-quality hot melt adhesive machine should have good durability and reliability, be able to maintain stable operation under long-term high-intensity working conditions, and avoid losses caused by frequent shutdowns due to faults.

2. Performance parameters: Suitable hot melt glue machines should be selected based on actual production needs, such as power size, glue melting speed, applicable temperature range, etc., which should be matched with actual working conditions to ensure production efficiency and product quality.

3. Adaptability: Different industries and application scenarios have varying requirements for hot melt glue machines. Therefore, when selecting, it is also necessary to consider the adaptability of the equipment to see if it can flexibly meet the work needs in various complex environments.

4. After sales service: Purchasing a hot melt adhesive machine is not only about purchasing hardware equipment, but also includes subsequent technical support and service guarantee. A good after-sales team can quickly respond to equipment failures, solve problems, reduce downtime, and ensure normal production.

Why do diapers use hot melt adhesive?

The production process of diapers is a relatively complex combination process, which is composed of surface non-woven fabrics, water-absorbent cores, PE composite bottom films, magic buckles and front waist stickers, anti-side leakage non-woven fabrics, elastic bands and many other materials. The combination of the above materials is bonded through hot melt adhesive, which is the current production process of all diapers. It can be seen that "hot melt adhesive" will be present in the normal production process of diapers.

What are the methods of gluing diapers?

There are two ways to apply glue. One is spraying glue, and the other is scraping glue. These two methods use a spray gun and a scraper gun. The spray gun uses several small holes in the spiral to blow out the gas at a set pressure. , the glue squeezed out from the glue holes surrounding the pores is sprayed in a spiral shape on the surface of the material to be composited, and then passes through a series of pressure rollers to firmly composite the materials together.

Is the smell of hot melt glue toxic?

Hot melt collagen material consists of main resin, tackifier resin, diluent or softening oil, additives and other ingredients. The inherent smell of raw materials is an important source of the smell of hot melt adhesive.

During the production process, hot melt adhesive may also have new odor sources, and the odor can be reduced through production process control. During the logistics and transportation of hot melt adhesive, it may also be contaminated with new odors. But generally speaking, the slight smell contained in the hot melt adhesive itself is non-toxic.

Is hot melt glue harmful to babies?

Hot melt adhesive is non-toxic and odorless, and is an environmentally friendly chemical product. Its physical state changes with changes in temperature. Therefore, when hot melt adhesive is used in the production of diapers, the resulting glue is a production defect and belongs to the after-sales scope of the product, but it will not cause any harm to the human body.

1. PUR hot melt adhesive for fabric bonding

It can greatly reduce the labor intensity of clothing through bonding and stitching, and the high-imitation clothing made is good, well-fitting and strong. Hot melt adhesives used for fabric bonding mainly include polyamides, polyphenols and polyurethanes.

2. PUR hot melt adhesive for lining processing

The adhesive lining is made by the surface of the fabric on the surface of the fabric. In use, the adhesive backing fabric is cut into the desired shape and size, and the side on which PUR hot melt glue is applied is thermally bonded to the back of the other fabric material. It is arranged on the high imitation clothing layer and serves as the skeleton of high imitation clothing, simplifying the handling and time of high imitation clothing, making high imitation clothing lightweight, beautiful, comfortable, retaining shape, washable, and durable. Interlining processing generally requires hot melt adhesives to be colorless, odorless, soft, fast, dry and moisture-resistant, and the adhesive does not affect the fabric and is light-resistant.

3. PUR hot melt adhesive for carpet bonding

Carpets used for PUR hot melt adhesives are mainly copolymers of ethylene and other olefinic monomers, such as ethylene-vinyl acetate copolymer, ethylene acrylate copolymer, etc. In most cases, ethylene-vinyl acetate copolymer (EVA) is used.

Integrated boards are being used more and more widely in decoration due to their unique material properties such as environmental protection, moisture-proof, mildew-proof, sound insulation, heat preservation, fire prevention, and convenient installation. In some areas, integrated boards have even become the first choice material for decoration. The main reason for this phenomenon is its environmental protection and convenient installation advantages.

Integrated boards are divided according to materials and can usually be divided into: bamboo and wood fiber integrated walls, aluminum integrated walls, and stone-plastic integrated walls. Since bamboo and wood fiber has a relatively wider market acceptance, this article uses bamboo and wood fiber integrated walls as the example. It is made of a base material produced by high-temperature composite production of bamboo powder, wood powder, polymer aldehyde-free polymeric components and other environmentally friendly materials, and is then coated with environmentally friendly decorative materials. Because the base material is made of environmentally friendly materials and compounded at high temperatures. The various raw materials that make up the base material have changed their material properties during the high temperature process. Almost all the volatile chemicals contained in the base material have been released after high temperatures, so choose qualified ones. The integrated board base material itself produced from raw materials rather than recycled materials can be very environmentally friendly. In the end, the key link in determining the environmental protection of integrated walls is surface coating.

PUR hot melt adhesive is much more environmentally friendly than cold glue. It is widely used in auto parts, textile industry, shoemaking industry, book binding, food packaging industry, household appliances, and electronic products. PUR hot melt adhesive is used in the building materials and home furnishing industries. Glue and PUR hot melt adhesive machines are already the first choice.

Compared with cold glue, PUR (polyurethane hot melt glue) is a reactive adhesive.

It has the following significant advantages:

A. It has the remarkable characteristic of irreversible moisture reaction - it does not rebound when encountering hot or cold environments;

B. 100% solid, no solvent - no harmful substances such as VOC, benzene, formaldehyde, etc. are emitted;

C. High initial bonding strength - short reaction time;

D. UV resistance - convert harmful UV light into harmless heat energy to protect materials;

E. High production efficiency - equivalent to 5 times the efficiency of cold glue equipment production;

F. High environmental performance - E0 level environmental protection.

Using hot melt glue to seal cartons  is already very mature in the industry, but sometimes the glued box will open as soon as you pinch it. What is going on?

First of all, it is necessary to determine whether the material used to make the box is the same as before, and whether the surface has been treated in any way, resulting in poor hot melt adhesive. In this case, the main reason is that the carton seal is not friendly to hot melt adhesive. For example: before some cartons are sealed with hot melt adhesive, their surfaces will be polished, laminated, etc. in order to be beautiful and high-end. Such carton materials will cause considerable difficulty in the bonding of hot melt adhesives. . Because the performance of hot melt adhesives for the same application on the market is not very different, it will be difficult to find a suitable hot melt adhesive, and passive selection may increase production costs. After comprehensive consideration, if the sealing effect is really poor, it is recommended to adjust the surface treatment process of the carton.

Secondly, whether the temperature has changed significantly from before, the external temperature will affect the curing speed of the hot melt adhesive. When the weather is cold, the curing speed will be shortened, and if the line speed does not keep up, it will not stick well. This problem can be solved in the following ways. First, increase the production line speed so that the glue can complete the box sealing operation with better pasting performance; second, increase the operating temperature of the hot melt glue machine by 5 to 10 degrees Celsius, and extend the cooling time. time; the third is to replace the hot melt adhesive and use one that does not dry as quickly in cold weather.