What Is Foam Cutting Machine Manufacturers?

Saudi Arabia Continuous Foam Project Case-Complete Procurement for a New PU Foam Factory

Project Background

In September 2021, we received an inquiry from Abdullah, a client from Saudi Arabia. He planned to build a new PU foam factory serving the Saudi local market and the Yemeni market, mainly for furniture and mattress flexible PU foam products. He also planned to include downstream processing.

The client had local foaming workers and some basic production conditions in place. As the project moved forward, it required coordinated planning of target products, equipment configuration, factory layout, and the connection between foaming and downstream processing.

Early Communication and Project Support

For this project, we first discussed the target market and product direction with the client, then communicated the basic requirements for furniture and mattress flexible PU foam production, including density, hardness, and the connection with downstream cutting and processing.

Based on the client’s factory conditions, we provided a factory layout plan to organize equipment placement, production flow, the connection between the foaming area and downstream processing area, and operator working space.

During the communication process, we held multiple video meetings with the client and showed him our real flexible PU foam production process. This allowed him to directly understand the operating condition of the continuous foam machine, the process connection during foaming, and how downstream cutting and processing would fit into actual production.

In terms of equipment discussion, the communication focused on the client’s specific questions, including ease of daily operation, the practical differences between different equipment designs, and which configurations were more suitable for the current project conditions.

The rebonded foam machine purchased by this client

Why the Client Finally Chose Us

The client first inquired about a continuous foam machine. As the communication progressed, the discussion moved step by step toward complete line configuration and factory setup. His final decision to continue the project with us was mainly related to the following points.

1. Timely replies kept the communication moving forward
In the early stage of a new PU foam factory project, questions continue to increase. During the process, the client kept adding details related to product direction, equipment connection, factory arrangement, and manpower coordination.

In this project, the client’s questions were continuously answered, and the communication did not stop at any stage. Once one point was clarified, the next discussion could continue smoothly.

2. The answers directly addressed the client’s actual questions
At the early stage, the client did not lack equipment brochures. What affected his judgment was whether his questions could be explained clearly.

During communication, his concerns were not limited to the continuous foam machine itself. He also focused on product direction for the target market, the basic production needs for furniture and mattress flexible PU foam, the connection between foaming and downstream processing, and how the new factory should be arranged under existing conditions.

The replies consistently followed these actual questions and did not stay at the level of general equipment introduction.

3. The solution was developed around the project’s real conditions

This was a new factory project, but the client already had local foaming workers, and the factory conditions were already defined. As communication moved forward, the solution discussion kept following these actual conditions, including how to arrange the factory space, how to introduce the complete line under existing manpower conditions, how to connect the foaming area with the downstream processing area, and which configurations were more suitable for the current project schedule.

What the client saw was not a fixed standard configuration, but a solution approach developed around his own project conditions.

4. The discussion covered practical production use, not only equipment itself

In equipment communication, the client was concerned not only with the equipment itself, but also with how it would be used in real production, such as daily operating convenience, whether parameter adjustment was clear, which links were more likely to cause problems, and how foaming and downstream cutting and processing could be connected more smoothly.

This part of the discussion continued throughout the early communication and did not stop at paper specifications.

5. The topics discussed early could continue into the later solution

The product direction, layout relationship, equipment connection, and processing arrangement discussed in the early stage all continued into the detailed configuration discussion later. The topics raised earlier could continue into the solution without disconnect.

Final Procurement Content

• one complete continuous foaming production line
• one rebonded foam production line, including: rebonded foam machine, steam boiler, foam shredder machine
• one CNC foam cutting machine
• two circular foam cutting machines
• one vertical foam cutting machine

Loading rebonded foam line

Loading continuous foam machine and foam cutting machine

If you are also planning a new PU foam factory, or evaluating continuous foam line, rebonded foam line, and cutting machine configurations, you can send us your product direction, factory conditions, and project plan. We can discuss a suitable solution with you based on your actual situation.

Phase One: Gas Nucleation Process

The raw materials react in the liquid phase or rely on the generation of gas substances and gas volatilization during the reaction. As the reaction progresses and a large amount of heat is generated, the amount of gas substance generated and volatilized continuously increases. When the gas concentration exceeds the saturation concentration, fine gas bubbles begin to form in the solution phase and rise. As the reaction nears its end, a milky phenomenon appears in the liquid polyurethane material, known as the "milky time."

Phase Two: Self-nucleation Process

In this stage, the gas concentration continues to increase and reaches a certain level. After that, the gas concentration gradually decreases, and new bubbles no longer form. The gas in the solution gradually reaches an equilibrium saturation concentration. During this stage, the viscosity of the liquid material gradually increases, and the gas continuously merges and expands in the gradually viscous liquid phase. The volume of the bubbles continues to expand. The viscous liquid phase forming the outer wall of the bubbles gradually thins. Due to the surface tension relationship between the gas and liquid interfaces, the bubble volume increases from small to large, gradually transforming from a spherical shape into a three-dimensional geometric shape composed of polymer thin films, finally forming an open network structure of three-dimensional micropores. In the synthesis process of polyurethane foam, this stage exhibits polymer volume expansion and foam rising.

Phase Three:

After the gas concentration drops to a certain level, bubbles no longer form. With the permeation of the gas, the concentration continues to decrease, reaching the final saturated equilibrium in the process of the polymeric foam wall transitioning from a viscous liquid state to a non-flowing solid state.

Cold Cure

A process for seat foam production, which produces high resilience foam (referred to as HR foam).

During this process, the mold temperature is generally between 50-70 degrees Celsius; the polyether molecular weight is typically between 2500-6500, and the ISO can be TDI/TM/MDI.

This process has high production efficiency, low energy consumption, and is currently widely used.

Pump Capacity

Used to check the stability of the metering pump flow output.

The current method for verifying pump capacity is as follows: at the set flow rate, shoot continuously 35 times, weigh each shot, then calculate the capacity. Based on the pump capacity, determine whether the metering pump needs repair or replacement. Generally, pump capacity is checked every three months.

Pump Linearity

A characterization of the correlation between the metering pump's speed and output.

Usually, five different speeds are selected for flow testing. The output of the metering pump at each speed is then obtained. If these five points align on a straight line, it indicates good linearity between the metering pump's speed and output.

NBT (New Blending Technology)

NBT stands for New Blending Technology.

The previous blending technology involved spraying and mixing one ISO with one POL to react and produce polyurethane foam. When adjusting process parameters with this method, only the POL/ISO mixing ratio and the casting weight could be adjusted, with no other adjustments possible.

NBT involves spraying and mixing one ISO with 2 or 3 groups of POLY materials to react and produce polyurethane foam. (Equipment requires a frequency converter)

NBT can adjust the following variables: formula moisture, formula solids content, formula index, casting weight, and other variables. This allows for greater process tolerance when manufacturing foams of different densities and hardnesses.

TPR (Timed Pressure Release)

TPR stands for Timed Pressure Release, also known as venting or pre-venting.

Typical TPR parameters are: venting starts around 90-120 seconds after mold closure, with the bag dropping down, venting for about 2 seconds, then the bag rising back up.

Common phenomena: Venting too early can result in tender products prone to tearing. Venting too late can lead to stiff products prone to shrinkage after demolding.

Initial Spray

At the start of normal pouring, the ISO and POLY nozzles are opened simultaneously, allowing the materials to mix in the mixing chamber and react to produce polyurethane foam.

If during pouring the ISO and POLY nozzles do not open simultaneously, the one that opens first will cause the material to flow out of the mixing chamber without reacting, resulting in unreacted material at the beginning of the foam. If polyether comes out first, the foam will be sticky and wet at the top (mild initial spraying), while if ISO comes out first, the foam will be crispy, locally thin (mild initial spraying), or have ISO spots (severe initial spraying).

Common phenomena: Another special case is when there is softness at the initially poured area, which could also be a form of initial spraying. This might be due to the component coming out first, causing the foam at the initial pour point to be soft.

Foaming Index

When ISO and POL react, if they react in the exact theoretical amounts, it's called stoichiometric reaction, and the foaming index is defined as 100.

Foaming Index = Actual ISO usage/Theoretical ISO usage * 100. Currently, the foaming index for seat foaming is generally between 90-105.

As the foaming index increases, the foam gradually becomes harder.

Index > 105, the product is prone to being brittle; Index < 85, the product is prone to closed-cell shrinkage.

The amount of foam stabilizer determines the size of the foam structure's cells. More stabilizer leads to finer cells, but too much can cause shrinkage. Finding the right balance is crucial; too little stabilizer and the cells won't support each other, resulting in collapse during forming. Both are catalysts in action.

Polyurethane (Soft Foam) refers to a type of flexible polyurethane foam plastic with a certain elasticity, mostly having open-cell structures.

Polyurethane (Hard Foam) refers to foam plastics that do not undergo significant deformation under certain loads and cannot recover to their initial state after excessive loads. Mostly closed-cell.

Hard Foam Silicone Oil

Hard foam silicone oil is a type of highly active non-hydrolyzable foam stabilizer with a silicon-carbon bond, belonging to a broad-spectrum silicone oil category. It has excellent comprehensive performance and is suitable for HCFC-141b and water foaming systems, used in applications such as boards, solar energy, pipelines, etc.

Product Features:

1. Good emulsification performance: The excellent emulsification performance allows for good dispersion and mixing of the composite materials during the reaction with isocyanate, resulting in good flowability. The produced product has uniform cells and a very high closed-cell rate.

2. Good stability: The special molecular structure effectively controls the surface tension of the cells, stabilizing the cell structure and providing the product with excellent mechanical properties.

Soft Foam Silicone Oil:

A general-purpose siloxane surfactant for polyether-type flexible polyurethane foam plastics, it is a non-hydrolyzable polydimethylsiloxane-polyethylene copolymer, a high-activity stabilizer. It is used as a foam stabilizer in the production of polyurethane soft foam (sponge). It can provide a thin skin. In very low-density foam, it provides strong stability with fine and uniform cells. In medium-depth foam, compared to similar silicone oils, it has better foam opening properties and breathability.

In polyurethane flexible foams, dichloromethane (MC) is often used to adjust the density and hardness of the foam. With a boiling point of only 40.4°C, during foaming, the reaction of water and TDI generates a large amount of heat, causing MC to evaporate into gas, thus expanding the foam body and reducing foam density.

The vaporization of MC consumes a lot of heat, which can affect the foaming process of the foam in some cases. The following two figures show the changes in the maximum foam temperature and the time to reach it after adding different amounts of MC to a specific formula.

From the charts, it can be observed that after adding MC, the maximum foam temperature decreases significantly, and the time to reach the maximum temperature also increases.

These are just changes in data, but how do they manifest during the actual foaming process? To understand this, let's briefly look at the polyurethane reaction process.

The main reaction in polyurethane foaming is the reaction of water and isocyanate to produce carbon dioxide and amine, and the reaction of polyether polyol and isocyanate to produce polyurethane. However, there are many secondary reactions, summarized as reactions generating urethane and reactions generating urea.

Secondary reactions change the molecular structure of the polymer from linear to cross-linked. Due to different reaction conditions and raw materials, the structure of polyurethane can vary greatly. In general, the more secondary reactions, the more complex the cross-linked structure, resulting in increased hardness and improved tear strength. Of course, the resistance to yellowing also improves, but that's another topic. Increasing the foaming index will strengthen secondary reactions.

Having said so much, what does this have to do with MC? Secondary reactions are all endothermic reactions, requiring heat absorption. However, the vaporization of MC also requires a large amount of heat, thus creating a competitive relationship. Adding a large amount of MC will significantly weaken secondary reactions, increasing the proportion of linear structures in the foam, making it softer, and decreasing thermal plasticity.

Even in colder temperatures during winter, attention should be paid to this issue. Properly increasing the water content in the formula to generate more heat helps maintain the physical properties of the foam without significant changes.