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Application and introduction of PUR

Hot melt adhesive is the abbreviation of hot melt adhesive. It does not use any solvents during production and application, is non-toxic, odorless, and does not pollute the environment. It is known as "green adhesive" and is especially suitable for use on continuous production lines.

1. Hot melt adhesive for fabric

Mainly used in the production of clothing, shoes, hats, dustproof, moisture permeability, protection, and furniture. Garments using the glue not only have a crisp and plump appearance, but also have the characteristics of being naturally flat after washing and being worn without ironing. Shoes and caps using the glue are light, breathable, and have good shape retention. They are especially used in the shoe industry and have the advantages of comfortable wearing and reducing shoe odor. The technical indicators of the hot melt adhesive for this purpose are as follows:

Appearance: white or slightly yellow granular or powdery.

Melting point: 105-115°C; Melting index: 18-22G/10Min (160°C);

Bulk density: 0.48-0.52G/CM3; angle of repose: 30-35 degrees;

Bonding strength: ≥1.5-2.0KG/25MM; washing resistance: ≥5 times.

Such hot-melt adhesives can be divided into polyamide (PA), polyester (PES), polyethylene (LOPE and HDPE) and polyester amide (PEA), etc. This type of adhesive has passed the appraisal of five achievements and completed the national "Seventh The key projects in the Five-Year Plan and the Eighth Five-Year Plan of Hebei Province won the National Invention Award, one scientific and technological achievement award of Tianjin and Hebei Province, and three national invention patents.

2. Hot-melt adhesives for packaging and book binding. At present, the packaging and sealing of food, beverages, instant noodles, cigarettes, beer, medicine, etc., are mostly completed with hot-melt adhesives through a box sealing machine. The bookbinding industry has now abolished the old thread and binding, and replaced it with hot-melt adhesive bonding technology, which not only improves the quality of binding, but more importantly, greatly accelerates the speed of binding. The technical indicators of the hot melt adhesive for this purpose are as follows:

For packaging

Appearance white granular light yellow flake

Melting point (℃) 70-84 65-78

Viscosity 2500-3500 5500-6500

Hardness 78-82 65-75

Curing speed 3-5 0-20

3. Hot melt pressure sensitive adhesive

Mainly used in sanitary napkins for women, children's diapers, mattresses for sick mattresses, incontinence products for the elderly, etc. Especially the latter, as the population structure of our country continues to age. The demand for elderly incontinence products will increase rapidly in the future. The technical indicators of the hot melt adhesive for this purpose are as follows:

Appearance: white or light yellow block viscoelastic, solid

Melting point: 80-90℃ Adhesive strength: 2.0-2.5lG/25MM

Hygiene requirements: tasteless, non-toxic, and non-irritating to the skin.

4. Multi-purpose solvent-based hot melt adhesive

In the production of many products, such as: hot melt transfer, liquid crystal material sealing, wallpaper anti-counterfeiting, painting and calligraphy, computer printing, food production date typing, wire and cable coding, etc. Some granular or powder formulations do not need to be made into liquid form in the presence of a suitable solvent, and coated on a certain substrate to obtain a thin and uniform film before they can be used in the production of subsequent processes. Due to the different types of solutes (hot melt adhesives), solvent-based hot melt adhesives for various purposes can be prepared.

5. Hot melt adhesive for furniture edge banding

my country is a country lacking wood. Except for a small amount of high-end furniture that uses solid wood, most general-purpose furniture is made of fiberboard, shavings or sawdust boards, and the edge parts of the furniture boards must be glued together with hot melt glue to increase the aesthetics. Solid wood furniture. The technical indicators of the hot melt adhesive for this purpose are as follows:

Appearance: white or slightly yellow granular or rod-like.

Melting point: 70-84°C; viscosity: 45000-75000 (180°C)

Relative hardness: 70-80%; curing speed: 8-12 seconds.

Application and introduction of PUR

Technical parameters of PUR hot-melt laminating machine:

1.Working cloth width:

1650mm

2.Mechanical spokes:1800mm

3.Equipment line speed:0~30 m/min

4.Equipment size (length * width * height):9900×3300×3200 mm

5.Heat transfer oil heating power:24KW and 12KW adjustable, hot oil circulation 180℃(MAX)

6.Total power of equipment:60KW

7.electricity supply:380V 50Hz

8.Total weight of equipment:

9500KG

Equipment characteristics of PUR hot-melt laminating machine:

PUR hot melt laminating machine equipment control adopts programmable PLC design and human-machine interface control, humanized operation, easy maintenance, tension-free discharging device, with heating circulation system, convenient to control the temperature rise and stability of the glue, and laminate materials and The finished product can adopt the method of center winding or surface selection according to the needs. The gluing method is divided into two options: dispensing and full coating.

Features of PUR hot-melt laminating machine equipment:

1.The PUR hot melt adhesive used does not contain solvents and is an ideal green glue;

2.The products have no residual solvents, no pollution and emission problems in production, energy saving, and small floor space;

3.The compounding process has a wet-solid reaction, irreversible, strong adhesion and good washing fastness;

4.PUR hot melt adhesive does not contain water and solvents, does not need to be dried, and has a fast compounding speed;

5.Strong viscosity, save the amount of glue and save costs;

6.The compounding process is fully linked and controlled, the substrate is not stretched, is light and soft, and feels good;

7.The heat source is oil heat, which heats up quickly and the heat is even;

8.The glue melting system is independent, and the glue melting is sufficiently fast;

9.Point-like net pattern gluing, the finished product has good air permeability and strong three-dimensional effect;

10.The humanized design of the machine saves operators;

11.With a small amount of diversified production design, cost saving, the digital control system makes the operability better.

Precautions for the operation of PUR hot-melt laminating machine:

Operators can only operate this equipment after they are fully familiar with the machine's performance and working principles. This equipment must be operated by a dedicated person, and non-operating personnel cannot open or move randomly.

Before production, check whether electrical appliances such as cables, circuit breakers, contactors, and motors meet the requirements.

Before production, check whether the three-phase power supply is balanced, and it is strictly forbidden to start the equipment without phase.

During the production period, check whether each rotary joint is safe, whether the pipeline is unblocked, whether there is any damage or oil leakage, and remove it in time.

The hot oil machine must be turned on before production, and the production can only be carried out after the temperature rises to the temperature required by the process. Before production, check whether the pressure of each barometer is normal, whether there is any leakage in the gas path, and repair it in time

Before production, check the fastening of each connection to see if there is any looseness or falling off, and repair it in time.

Before mass production of the equipment, a small amount of test should be done first, and mass production can only be carried out after success.

Before production, check the lubrication conditions of various hydraulic stations, reducers, bearing bushes, lead screws, etc., and fill in hydraulic oil and lubricating oil in a correct and timely manner.

After the machine is stopped, the glue tank, glue squeegee accessories, and anilox roller must be cleaned in time to remove residual glue and dirt from all parts of the machine for next use.

It is strictly forbidden to contact corrosive liquids with the rubber rollers, and always ensure that the surface of each drive roller is clean and free of foreign matter.

It is strictly forbidden to pile up debris around the hot oil machine, and keep the hot oil machine and its surroundings clean and free of foreign objects at all times. When the hot oil machine is working, it is strictly forbidden to touch the delivery oil pipe by hand.

Maintenance and maintenance of PUR hot-melt laminating machine:

The lubricating oil of the reducer should be changed every six months. ·

The 350# heat transfer oil should be replaced every six months when the hot oil machine is used.

The hydraulic oil tank should be replaced with N46 or N32 anti-wear hydraulic oil every six months.

Check the hydraulic oil tank, the oil tank of the hot oil machine once a month, remove the grease, remove the impurities, and add enough lubricating oil and heat transfer oil

Lubricating oil should be added to bearings and screws every shift.

After each shutdown, the glue tank, glue squeegee accessories, and anilox roller must be cleaned in time to remove residual glue and dirt from all parts of the machine.

The chain should be checked every shift to ensure normal lubrication and timely tensioning.

Check the connecting parts every shift, and whether the fasteners are loose or missing, and fasten them in time.

Check the oil pumps, cylinders, solenoid valves, distribution valves, oil pipes and other connections for oil leakage every shift.