Hot melt glue machine is a common industrial equipment, widely used in carton packaging, cardboard manufacturing and other industries. It heats the solid glue block to convert it into molten glue, and then applies the glue to the cardboard by spraying or coating to achieve the bonding effect. The following will introduce the application of hot melt glue machine on cardboard.

1. Cardboard packaging: Hot melt glue machine plays the role of bonding cardboard in cardboard packaging. When making cartons, the cardboards need to be firmly connected to ensure that the structure of the carton is strong and can withstand heavy objects and vibrations during transportation. The hot melt glue machine can spray hot melt glue on the seams of the cardboard or other locations that need to be bonded. The glue liquid quickly cools to form a strong bonding layer, which firmly connects the cardboards together.

2. Cardboard repair: During cardboard packaging or carton transportation, the cardboard may be damaged or cracked due to external impact or other reasons. The hot melt glue machine can glue the damaged parts together by spraying hot melt glue, repair the damage of the cardboard, and maintain the integrity and service life of the cardboard.

The application of hot melt glue machine on cardboard has the following advantages:

1. High efficiency: The hot melt glue machine can quickly melt the solid glue block into a molten liquid, and the glue liquid quickly cools down after contacting the cardboard to form a strong adhesive layer. This high efficiency can improve production efficiency and reduce downtime in the process.

2. Uniform coating: The hot melt glue machine can achieve uniform spraying or coating of the glue liquid, ensuring that all parts of the cardboard can be fully bonded. This is very important for quality control in the cardboard manufacturing and packaging process.

3. Environmental protection: The hot melt adhesive used in hot melt adhesive machines is usually made of environmentally friendly materials, does not contain organic solvents and volatile organic compounds, and does not pollute the environment.

Hot melt adhesive machine provides a reliable bonding solution and is widely used in carton packaging, cardboard manufacturing and other industries, providing reliable packaging materials for product transportation and protection.

Hot melt glue machines are versatile tools widely used in various industries and for numerous applications. These machines have found innovative applications that have revolutionized the way we approach tasks requiring adhesion and precise bonding.

One of the most notable innovations in the application of hot melt glue machines is in the realm of packaging. Traditionally, packaging processes relied on adhesives that required drying time, leading to inefficiencies in production lines. However, hot melt glue machines offer a faster alternative that bonds instantly upon contact, significantly speeding up packaging operations and improving overall efficiency.

Another area where hot melt glue machines have made a significant impact is in the field of woodworking. These machines are now commonly used in woodworking shops for tasks such as edge banding, furniture assembly, and veneer application. The precise application of hot melt adhesive ensures strong and durable bonds, making it an indispensable tool for carpenters and woodworkers.

Beyond traditional industries, hot melt glue machines have also found innovative applications in fields such as crafts and DIY projects. Crafting enthusiasts use these machines to create intricate designs, attach embellishments, and assemble various materials with ease. The precision and control offered by hot melt glue machines make them essential tools for artists and hobbyists looking to bring their creative visions to life.

Moreover, hot melt glue machines have found applications in the medical industry, particularly in the assembly of medical devices and equipment. The sterile nature of hot melt adhesives, coupled with the ability to create strong bonds quickly, makes them ideal for medical applications where precision and reliability are paramount.

In conclusion, hot melt glue machines have evolved beyond simple tools for basic adhesion tasks to become indispensable assets in a wide range of industries. Their ability to provide instant bonding, precision application, and versatility have led to innovative applications that continue to push the boundaries of what is possible. As technology advances and new materials are developed, the applications of hot melt glue machines are likely to expand even further, driving innovation across multiple sectors.

Advantages of PUR platen hot melt adhesive machine

1. The pressure plate of the PUR pressure plate hot melt glue machine is made of aluminum alloy precision casting and CNC precision machining. The outer surface of the heating plate of the PUR pressure plate hot melt glue machine is treated with deep penetration sintering of Bang Teflon, which has the advantages of high coating strength and not easy to fall off.

2. The glue is isolated from the air during melting. There is an o-ring seal between the heating plate of the PUR pressure plate hot melt glue machine and the inner wall of the glue barrel, so that the molten liquid glue will not come into contact with the air, ensuring the PUR use conditions.

3. The glue on the PUR pressure plate hot melt glue machine is easy to remove, which can effectively prevent the carbonization of the glue, ensure the best glue, and reduce the blockage of the glue delivery system.

Operation process of PUR platen hot melt adhesive machine

1. When using a PUR pressure plate hot melt adhesive machine, the heating plate is pressed into the glue barrel from top to bottom, and the heating plate is located above the glue.

2. When the PUR pressure plate hot melt adhesive heating plate is heated, only the upper layer of PUR glue contacts the heating plate, causing it to reach the melting point and melt. At this time, the lower part of the glue barrel is not heated, and the amount required during production is melted to avoid aging and deterioration of the glue due to long-term heating.

Hot melt adhesive nozzles are devices that utilize high temperature to melt glue and spray it with precision. In recent years, mobile phone manufacturers have widely adopted hot melt adhesive nozzles to assemble the internal electronic components of mobile phones in a more efficient and reliable way. Traditional pasting methods require manual operation or traditional curing glue, which easily leads to quality problems and uneven bonding.

Hot melt adhesive nozzles are used in many aspects of mobile phone manufacturing. First, in terms of fixing electronic components, hot melt adhesive nozzles can accurately spray glue to the position where it needs to be fixed, and ensure the reliability and stability of the components through a rapid curing process. Second, in mobile phone assembly, hot melt adhesive nozzles can provide high bonding strength and good sealing effect when connecting circuit boards and other components, thereby preventing the intrusion of dust and moisture.

In addition, hot melt adhesive nozzles can also play a role in sealing and fixing the mobile phone shell. By applying glue between the frame and the shell, the waterproof level of the mobile phone can be effectively improved and the stability of the overall structure can be increased. This is essential for the high performance requirements in modern mobile phone design.

The application of hot melt adhesive nozzle technology not only improves the efficiency and quality of the mobile phone manufacturing process, but also reduces production costs. Compared with the traditional manual operation or the use of curing glue, hot melt adhesive nozzles can realize automatic and precise glue injection, reducing manpower and material waste.

In short, as an innovative mobile phone manufacturing technology, hot melt adhesive nozzles are gradually changing the face of the mobile phone industry. By improving production efficiency, quality and reducing costs, hot melt adhesive nozzle technology will continue to promote the development of the mobile phone manufacturing industry.

Things to be aware of when using glue roller applicator:

●When using a hot melt machine, do not place other sundries on the machine or use it as a padded device.

●When moving or lifting the hot melt machine, only use the base. Do not use the cover on the hot melt machine, the door, the electrical components on the control panel or the joint on the insulation pipe to lift up the hot melt adhesive.

●When using a manual hot melt applicator, do not point the applicator at yourself or yourself.

#Submersible pumps are core equipment in chemical processes. With their corrosion resistance and efficient transportation, they significantly improve production safety and efficiency. According to global market data in 2024, submersible pumps account for 35% of the chemical industry, of which #fluoroplastic submersible pumps and #stainless steel submersible pumps are the two main types, targeting different working conditions.

1. Fluoroplastic submersible pump

Application areas: strong acid (such as sulfuric acid, hydrochloric acid), strong alkali and organic solvent transportation, commonly used in electroplating, pharmaceuticals, and wastewater treatment.

①Advantages:

Extremely corrosion-resistant, PTFE material can resist 98% of chemical media;

Good sealing performance, reducing the risk of leakage;

Lightweight design, easy installation and maintenance.

②Disadvantages:

Low mechanical strength, poor adaptability to high temperature and high pressure scenes;

Price is higher than ordinary metal pumps (average price is 20%-30% higher).

2. Stainless steel submersible pump

Application areas: medium and low corrosive media (such as salt water, weak acid), food processing and petroleum industry.

①Advantages:

Sturdy structure, suitable for high pressure and high temperature environment;

Low cost, market share of about 60%;

High degree of customization (such as 316L stainless steel model).

②Disadvantages:

Insufficient tolerance to highly corrosive media such as hydrofluoric acid;

Long-term use may cause pitting due to chloride ions.

2. The innovative contribution of submersible pumps to the chemical industry

Submersible pumps solve the leakage and efficiency problems of traditional pumps in the transportation of corrosive and high-temperature media through the design of direct immersion in the medium, becoming a key equipment for chemical process upgrades. Its core changes are reflected in two major technical routes:

4. Breakthrough application of fluoroplastic submersible pumps

Corrosion-resistant revolution: Using materials such as PTFE, it can withstand 98% of chemical media (such as hydrofluoric acid and concentrated sulfuric acid), which can extend the equipment life of high-corrosion fields such as electroplating and pharmaceuticals by 3-5 times

Safety upgrade: Magnetic drive technology (such as the Coenco brand) completely eliminates the risk of leakage and meets the explosion-proof requirements for the transportation of flammable and explosive media

5. Adaptability optimization of stainless steel submersible pumps

Cost-effectiveness advantage: It occupies 60% of the market share and is suitable for medium and low corrosion scenarios (such as salt water and weak alkali). It has been expanded to the food processing field through the upgrade of 316L material

High temperature and high pressure adaptation: Sulzer API 610 BB5 pumps achieve stable operation at 300℃ in slurry bed residue oil hydrogenation units

6.  Systematic industry impact

Environmental benefits: Wastewater treatment pumps (such as Wilo's 144 submersible mixers) help Zhuyuan Sewage Plant increase its daily processing capacity to 3.4 million m³.

Introduction

#Fluorine-lined centrifugal pumps are widely used in the transportation of highly corrosive media such as sulfuric acid, hydrofluoric acid, and organic solvents due to the excellent corrosion resistance of PTFE/PFA linings. Mechanical seals are core components for leakage prevention, and their replacement quality directly affects the life and safety of the pump. This article takes three typical media, 98% sulfuric acid, 40% hydrofluoric acid, and mixed organic solvents, as examples to explain the key points of operation.

I. General preparations

1. Safety protection

· Wear chemical protective clothing + mask (acidic medium) or organic solvent-resistant gloves (solvents)

· Set up a "maintenance" warning sign and confirm that the power supply is double disconnected

2. Pre-processing

· Close the inlet and outlet valves and drain the residual medium in the pump (sulfuric acid medium needs to be neutralized and rinsed with sodium carbonate solution)

· Use a special fluoroplastic cleaner to wipe the pump cavity to avoid metal tools scratching the lining layer

II. Key points for medium differentiation operation

Case 1: 98% concentrated sulfuric acid medium pump

· Special requirements: The sealing surface must be made of silicon carbide, and graphite rings are prohibited (sulfuric acid will cause graphite expansion and failure)

· Disassembly tips:

① Loosen the middle bolt of the pump cover first to prevent sudden splashing of sulfuric acid crystals

② Check whether the shaft sleeve has pitting caused by sulfuric acid corrosion, and replace it simultaneously if necessary

Case 2: 40% hydrofluoric acid medium pump

· Key steps:

① After disassembly, calcium gluconate gel is needed to neutralize residual fluoride ions

② The static ring must be filled with polytetrafluoroethylene, and the dynamic ring is recommended to be alumina ceramic

Case 3: Acetone/chloroform mixed solvent pump

·Precautions:

① Rubber #O-rings are prohibited, and perfluoroether rubber (FFKM) seals are used instead

② Thoroughly degrease with anhydrous ethanol before installation to prevent the solvent from dissolving the grease and contaminating the sealing surface

III. Standardized process for mechanical seal disassembly

1. Safety preparation stage

·Power off and lock (LOTO), and hang warning signs.

·Close the inlet and outlet valves and drain the medium in the pump (acid medium needs to be neutralized and flushed).

2. Coupling separation

·Remove the protective cover bolts and use the puller tool to disassemble the coupling (cast iron impellers need to be padded with wooden blocks to prevent cracking)

3. Pump body disassembly

·Symmetrically loosen the pump cover bolts and pull out the motor and impeller assembly as a whole.

·Large pump bodies need to use the pump cover screw holes to push out the impeller

4. Removal of seal assembly

·Remove the impeller nut with a socket wrench and pull out the impeller axially (threaded impeller needs to rotate counterclockwise)

·First remove the dynamic ring assembly, and then use non-metallic tools to pry out the static ring (protect the O-ring)

IV. Key steps for mechanical seal installation

1. Pretreatment

·Clean the shaft sleeve, sealing chamber and new seal with acetone

·Check that there are no scratches on the mirror surface of the dynamic and static rings and no deformation of the spring

2. Installation of static ring

·Press the static ring vertically into the sealing chamber to ensure that the anti-rotation pin is in the groove (clearance 0.1-0.2mm)

3. Assembly of dynamic ring

·Apply silicone grease before the dynamic ring assembly is inserted into the shaft, and adjust the spring compression according to the manufacturer's standard

4. Reinstall the whole assembly

·After the impeller is installed, manually turn the wheel to check that there is no friction sound

Tighten the pump cover bolts in diagonal order in batches (torque refers to GB/T 16823.1)

V. High-frequency operation risk tips

·Acid medium pump: HF pump needs to be neutralized with calcium gel after disassembly, and graphite seal is prohibited for sulphuric acid pump

·Solvent pump: FFKM O-ring must be used, and ethanol degreasing must be performed before installation

·Common taboos: It is forbidden to knock on the end face of the static ring, and the dynamic ring should automatically rebound ≥3 times after compression

VI. Test acceptance standards

1. After the point-to-point test is correct, it should run continuously for 30 minutes

2. Leakage control:

·Water medium ≤5 drops/minute

·Corrosive medium ≤3 drops/minute

VII. High-frequency maintenance questions and answers

Q: Why is the double-end face machine seal more recommended for fluorine-lined pumps?

A: Isolation fluid can be added to form a protective barrier, which is especially suitable for permeable media such as hydrofluoric acid

Q: How to deal with vibration exceeding the standard after the machine seal is replaced?

A: First check the dynamic balance of the impeller and the bending of the shaft, and then confirm that the verticality of the static ring installation is ≤0.05mm

In summary, the replacement and maintenance of the mechanical seal of the corrosion-resistant pipeline pump is crucial to ensure the normal operation of the equipment. Users must not only master the correct replacement method, but also carefully follow the relevant precautions to extend the service life of the equipment and improve production efficiency.‌

This article aims to introduce the performance of self-priming pumps in more detail and under what working conditions you should choose #self-priming pumps. I hope it will be helpful to you.

1. Comparison between #fluoroplastic self-priming pump and #stainless steel self-priming pump

①. Fluoroplastic self-priming pump

Performance characteristics: Made of PTFE/PP and other materials, resistant to strong acids and alkalis (such as 98% sulfuric acid, 50% hydrofluoric acid)

Applicable working conditions: chemical waste acid treatment, electroplating liquid transportation, corrosive media in the pharmaceutical industry

Advantages: Corrosion resistance far exceeds that of metal pumps, light weight (30% lighter than stainless steel of the same model)

Disadvantages: Upper temperature limit 120℃ (stainless steel can reach 200℃), not resistant to particle wear

②. #Stainless steel self-priming pump (304/316L)

Performance characteristics: high mechanical strength (compressive capacity up to 1.6MPa), can handle media containing trace solid particles

Applicable working conditions: food processing (such as sauce transportation), seawater desalination pretreatment, environmental sewage treatment

Advantages: good structural stability, long maintenance cycle (bearing life is about 8000 hours)

Disadvantages: not resistant to chloride ion corrosion (316L should be used with caution when Cl-＞200ppm)

2. #Fluoroplastic self-priming pump vs #Fluoroplastic centrifugal pump‌

①. Fluoroplastic self-priming pump‌

Through the gas-liquid separation chamber and reflux hole design, it needs to be filled with liquid once before the first start, and then the air in the suction pipeline can be automatically discharged to form a vacuum (the self-priming height is usually 3-4m)

Typical structure: external mixing design, the impeller groove and the volute cooperate to achieve gas-liquid mixing and separation

②. #Fluoroplastic centrifugal pump‌

Relies on the centrifugal force of the impeller to transport liquid, must be completely filled with liquid and exhausted before starting, no self-priming ability

Typical structure: closed impeller + volute flow channel, high requirements for medium purity

③. Key performance comparison

④. Typical application scenarios

Preferred working conditions for fluoroplastic self-priming pumps

Intermittent operation: such as chemical tank truck unloading, electroplating liquid circulation

Large liquid level fluctuations: underground storage tank suction, emergency drainage

Preferred working conditions for fluoroplastic centrifugal pumps

Continuous and stable transportation: pickling production line, pure water circulation system

High head requirements: chemical process pressurization (head can reach more than 80m)

⑤. Selection recommendations

Select self-priming pumps: when the working conditions have frequent start and stop, pipeline gas storage risks or the installation position is higher than the liquid level

Select centrifugal pumps: for scenes that pursue high efficiency, large flow stable transportation and can ensure continuous filling

3. Stainless steel self-priming pumps vs. #Stainless steel centrifugal pump

①.Core differences:

Self-priming ability: The self-priming pump can form a 5m water column vacuum when it is first started (the centrifugal pump needs to be filled with water)

Gas-liquid mixed transmission: The self-priming pump can handle media with a gas content of 15% (the centrifugal pump is limited to 5%)

Efficiency curve: The centrifugal pump is 5-8% more efficient at the rated point, but the self-priming pump is more stable under variable conditions

Installation requirements: The centrifugal pump requires NPSH>3m, and the self-priming pump allows a negative NPSH

②.Selection suggestions:

Select a self-priming pump for frequent start-stop/liquid level fluctuations (such as unloading oil from a tanker truck)

Select a centrifugal pump for large flow and stable conditions (such as fire water supply system)

Introduction: The Industrial Value of Slurry Pumps‌

Slurry pumps serve as core conveying equipment in industries such as mining, metallurgy, and chemical processing, undertaking the critical task of transporting highly abrasive, high-concentration solid-liquid mixtures. According to 2024 data from the China Heavy Machinery Industry Association, the global slurry pump market has surpassed $5.2 billion, with China accounting for 38% of the market share.

1. Core Knowledge System of Slurry Pumps‌

1.‌1 Basic Definition and Working Principle‌

1）Professional Definition‌: A slurry pump (Slurry Pump) is a centrifugal pump specifically designed for transporting slurries containing solid particles.

2）Working Principle‌: The rotation of the impeller generates centrifugal force, imparting kinetic energy to the solid-liquid mixture (Key parameters: Head 30-150m, Flow rate 10-6000m³/h).

1.2 Comparison of Mainstream Types

3. Key Performance Indicators‌

1）‌Wear Rate‌: Hard alloy lining with HRC58 or higher

2）‌NPSHr‌: ≤4.5m

3）‌Efficiency‌: Heavy-duty pumps achieve 75-82%

2. Selection Decision Tree‌

2.‌1 Medium Characteristics Analysis‌

‌Particle Size‌: μm-level to mm-level

‌Concentration Range‌: 5%-70% wt

‌pH Value‌: Acidic/Alkaline medium

‌2.2 Operating Condition Matching‌

1）‌98% Concentrated Sulfuric Acid Circulation (80°C)‌: ‌CYF Series (Fluoroplastic-Lined Pump)‌ — ‌CYF80-50-250

2）‌High-Hardness Mineral Slurry (Quartz Sand Tailings, SiO₂ Content >90%)‌: ‌CYH Series (High-Chrome Alloy Pump)‌ — ‌CYH150-400B‌

3）‌Titanium Dioxide Acid Digestion Filtration (20% Sulfuric Acid + Titanium Slag)‌:Fluorine-Lined Filter Press Pump (PTFE Back Ring on Impeller, Outlet with Safety Pressure Relief Valve) — ‌CYF80-65-160

3. Fluoroplastic Slurry Pump Maintenance Instructions‌

3.‌1 Daily Operation Maintenance‌

1） Vibration Monitoring‌

Daily inspection of bearing vibration value (should be ≤4.5mm/s)

Abnormal vibration requires immediate impeller balance check

2） Sealing System Management‌

Mechanical seal flush water pressure must be maintained ‌0.1-0.2MPa higher‌ than pump chamber pressure

Weekly inspection of seal leakage (normal ≤5 drops/minute)

3.‌2 Periodic Maintenance Standards‌

1） Flow-Part Inspection‌

Measure fluoroplastic lining thickness every ‌500 hours‌ (wear allowance ≥3mm)

Impeller and wear ring clearance should be ‌0.5-1.0mm‌

2） Lubrication System‌

Bearings: Replace grease every ‌2000 hours‌ (recommended ‌PTFE-based grease‌)

Motor bearings: Annual cleaning and oil change

3.3 Special Condition Handling‌

1）Crystalline Medium Treatment‌

Flush pump chamber with clean water after shutdown (especially when handling crystallizing media)

For long-term shutdowns, drain residual liquid and perform drying treatment

‌2）Temperature Control‌

Monitor lining thermal deformation when medium temperature ‌>80°C‌

Avoid sudden cooling/heating (‌ #heavy duty slurry pump #industrial slurry pump #mining slurry pump #best pump for slurry #electric submersible slurry pump #diaphragm slurry pump