Pulp & Paper Additives

What is Pulp & Paper Additives

Throughout the pulping and papermaking operation, various chemicals are added to the process. These additives are used to alter the final product properties, keep the process free of deposits, and/or improve the processing of the fibers. The majority of the additives are derived from synthetic origins.

AKD Polymer Emulsifier
AKD polymer emulsifier is a new type of strong cationic polymer emulsifier to replace traditional AKD emulsifier. Under the same conditions, each ton of sizing agent can reduce the cost by 50...
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Cationic Retention and Drainage Aid
Cationic Retention and drainage aid is a strong cationic polyelectrolyte, which appears as a colorless to light yellow viscous liquid. Safe, non-toxic, easily soluble in water, nonflammable,...
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Fixing Agent in Papermaking Inkjet Paper
The Fixing Agent in Papermaking Inkjet Paper is designed for receivable coating formulation for ink jet paper. It will provide ink jet paper a high degree of waterfastness and colorfastness. It...
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Dry and Wet Strength Agent for Papermaking
This kind of agent is used in damaged paper recycling for papermaking. After soaking in water, the wet strength of the finished paper produced by using a wet strength agent that is easy to reuse...
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Anionic Trash Catcher
This product gathers electrolyte for the strong cation, In the paper-making process can be used as anions capture agent, can effectively increase the size of the effect of filler to increase the...
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AKD Sizing Promoter
We can offer kinds of AKD sizing promoters, which can solve the problems of AKD maturation for different paper types and different sizing conditions. As an accelerator, it is added to AKD (alkyl...
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Why Choose Us

Quality assurance

The company successfully passed ISO9001 quality management system, ISO14001 environmental management system, and ISO45001 occupational health management system.

World-wide expertise

We know international markets and trends. Our expertise, experience and network cover all corners of the world.

Competitive prices

We offer our products at competitive prices, making them affordable for our customers. We believe that high-quality products should not come at a premium, and we strive to make our products accessible to all.

Rich experience

Has a long-standing reputation in the industry, which makes it stand out from its competitors. With over many years of experience, they have developed the skills necessary to meet their clients' needs.

Efficient and convenient

The company has established marketing networks around the world to provide high-quality services to customers in an efficient and convenient manner.

Professional service

We can accept factory inspection and goods inspection at any time. Technical discussion, research and development of new products, and complete after-sales service.

What Is the Difference Between Papermaking Dry Strength Agent and Papermaking Wet Strength Agent

Different usage methods
Papermaking dry strength agent is mainly used in dry papermaking process, while papermaking wet strength agent is mainly used in wet papermaking process.

Different mechanism of action
Papermaking dry strength agent mainly improves paper strength by enhancing the bonding force between fibers and forming a mesh structure, while papermaking wet strength agent improves paper strength and water resistance by enhancing the bonding force between fibers and forming a hydrogen bond network structure.

Different effects
Papermaking dry strength agent can improve the tensile strength and folding resistance of paper, while papermaking wet strength agent can improve the water resistance and burst resistance of paper.

Different scope of application
Papermaking dry strength agent is suitable for paper that requires higher strength and folding resistance, such as cigarette paper, filter paper, etc., while papermaking wet strength agent is suitable for paper that requires higher water resistance and burst resistance, such as waterproof packaging paper, printing paper, etc.

Different formula
Papermaking dry strength agent and papermaking wet strength agent have different formulas because their mechanism of action and use environment are different. Generally speaking, the formula of papermaking wet strength agent contains more hydrophilic groups and fewer hydrophobic groups to ensure that it can be fully dispersed in water and wrap the fibers.

Dry and Wet Strength Agent for Papermaking

Polymeric Wet-Strength Agents in the Paper Industry: An Overview of Mechanisms and Current Challenges

Polymeric wet-strength agents are important additives used in the paper industry to improve the mechanical properties of paper products, especially when they come into contact with water. These agents play a crucial role in enhancing the durability, strength, and dimensional stability of paper products. The aim of this review is to provide an overview of the different types of wet-strength agents available and their mechanisms of action. We will also discuss the challenges associated with the use of wet-strength agents and the recent advances in the development of more sustainable and environmentally friendly agents. As the demand for more sustainable and durable paper products continues to grow, the use of wet-strength agents is expected to increase in the coming years.

Can Papermaking Dry Strength Agent and Wet Strength Agent Be Used Together

From the perspective of action mechanism and common additives, there is no direct conflict between the two, so they can be used together in theory. However, in practical applications, the following points need to be noted:

Addition amount

The addition amount of dry strength agent and wet strength agent needs to be determined based on factors such as paper type, fiber raw materials, and production process. If the addition amount is inappropriate, it may have a negative impact on the quality of the paper.

Compatibility

Dry strength agents and wet strength agents produced by different manufacturers may have chemical reactions, so the compatibility between the two needs to be confirmed. It is recommended to conduct a small-scale test first, observe the effect, and then apply it on a large scale.

Production process

The use of dry strength agents and wet strength agents needs to be coordinated with the production process. If the process conditions are not suitable, it may affect the quality and performance of the paper.

Precautions for Adding Dry and Wet Strength Agents in Papermaking

Adding time
The addition time of papermaking wet strength agent is generally in the pulp pool and pulp tank. At this time, pay attention to the temperature of the pulp. It is best to add it at 50-60℃, because adding it at high temperature will reduce its effect.

Adding amount
The addition amount of papermaking wet strength agent should be controlled within an appropriate range. There is a standard addition range of 0.1%-0.3%. The specific addition amount should be considered according to the specific situation of papermaking to avoid excessive or insufficient addition.

Adding method
There are many ways to add papermaking wet strength agent, such as spraying, impregnation, direct addition, etc., which should be selected according to the situation of papermaking and equipment conditions. Different adding methods will also have different effects on the effect of papermaking.

Pulp pH value control
The addition of papermaking wet strength agent also needs to pay attention to controlling the pulp pH value. During the addition process, if the pulp pH value is too high or too low, it will affect the effect of papermaking, so pay attention to control.

Pay attention to chemical reactions
Papermaking wet strength agents will react chemically with other components in the pulp, causing changes in the properties and quality of the pulp. Therefore, pay attention to its compatibility and reactivity with other components in the pulp.

Main Component of AKD Sizing Agent

The main component of AKD sizing agent is alkyl ketene dimer (AKD). This substance is a reactive neutral paper sizing agent commonly used in the papermaking industry. ‌

Alkyl ketene dimer (AKD) is a white to yellow paste solid with good solubility in organic solvents such as ethanol, benzene, chloroform, etc., and stable in weak acid, weak base or other penetrant environments. It is an important papermaking auxiliary agent that can react with paper fibers to form a film and improve the water resistance of paper. ‌

In terms of preparation, alkyl ketene dimer can be emulsified through a homogenization process and is usually used with a cationic surfactant to form a white emulsion. This emulsion is suitable for reactive sizing agents made under moderately alkaline conditions, and is widely used in the production of various medium and high-grade cultural papers, photographic base papers, fruit bag papers, packaging papers, cardboards and other sized papers. ‌

AKD Sizing Promoter Specification

AKD Paper Sizing Promoter Code	IR-091A	IR-091B	IR-091C	IR-091D	IR-091E
Appearance	Colorless to light yellow viscose liquid
Solid content	35±1%	40±1%	40±1%	30±1%	40±1%
PH Value	5.0~7.0
Viscosity(25℃)	400-600cps	7000-9000cps	4000-8000cps	200-800cps	4000-8000cps
Use condition	Surface sizing	Surface/ inner	Surface/ inner	Surface sizing	Surface/ inner
	Most paper type	Most paper type	Most paper type	High light paper	Most paper type
	Common promote	Rapid promote	Rapid promote	Rapid promote	Rapid promote

Process of AKD Sizing Promoter

Sizing promoter is a commonly used bonding material, widely used in various industrial fields. The following is a brief introduction to the production process of sizing agent.

The production of sizing promoter requires the preparation of appropriate raw materials. The main raw materials include adhesives, solvents, fillers, etc. Adhesives can be selected from organic glue, inorganic glue, synthetic glue, etc. Different adhesives have different characteristics and uses; solvents are used to dilute and adjust viscosity. Common solvents include water, alcohol, benzene, toluene, etc.; fillers are used to change the rheological properties of sizing agents and increase adhesive viscosity. Common fillers include pigments, fibers, stone powder, etc.

The production process of sizing promoter can be divided into three steps: adhesive preparation, solvent adjustment and filler treatment. Adhesive preparation generally adopts reaction or synthesis methods, and appropriate additives and auxiliary agents are added as needed. Solvent adjustment generally adds appropriate solvents to the adhesive according to product requirements, and heats and stirs to fully dissolve the solvent. Filler treatment generally involves crushing and screening the filler to make its particle size and distribution suitable for the requirements of the sizing agent.

Mix the prepared adhesive and the appropriate amount of filler thoroughly. This step can be carried out using equipment such as agitators and mixers to ensure that the adhesive and filler are evenly mixed to obtain a sizing agent as a whole.

The sizing promoter is packaged and stored. Pour the prepared sizing agent into an appropriate container, seal it, mark the product information and production date, and then store it. The sizing agent generally needs to be stored in a cool and dry place, away from direct sunlight and high temperature environment to maintain its stability and service life.

The production process of the sizing promoter includes steps such as adhesive preparation, solvent adjustment, filler treatment, mixing and packaging. Through a scientific and reasonable production process, a sizing agent product with stable quality and good performance can be obtained.

Sizing Agents and Selected Sizing Accelerators for Paper Sizing

A sized paper containing an amphoteric accelerator resin, wherein the amphoteric accelerator resin is a polymerization reaction product of a quaternary ammonium diallyl ammonium monomer, an optional diallyl ammonium monomer and an unsaturated organic acid. The method of sizing paper using the amphoteric accelerator resin compound and a sizing agent significantly improves the sizing performance of the sized paper, and due to the addition of a fluorescent brightener, the sized paper exhibits excellent brightness retention.

Our Factory

Zhangjiagang Cpolymer Eco-Technologies Co., Ltd. is a professional manufacturer and supplier of Function monomers, Polymer series, Water treatment chemicals, Pulp & Paper additives, Textile dyeing auxiliaries, Oilfield additives, Pharmaceutical intermediates, Auxiliaries for Household Chemicals, with decades of experience in production, R&D, and application service.

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FAQ

Q: What are the wet strength agents in paper?

A: Wet strength development should not be confused with sizing, the first representing the strength of the paper once wet, the latter being the speed and amount of water absorbed by the paper. Normal wet strength resins are: urea-formaldehyde (UF), melamine-formaldehyde (MF) and polyamide-epichlorohydrin (PAE).

Q: What are dry strength additives for papermaking?

A: Dry strength additives are typically used to offset the decline of paper strength resulting from addition of fillers or secondary fibres (such as recycled fibres). Frequently used dry strength additives are natural or synthetic polymers.

Q: How to increase wet strength of paper?

A: A common technique for wet-strength development of paper is to add CMC together with PAE to the pulp. Cationic PAE helps to retain the anionic CMC to the fibre surface. Both dry- and wet strength are improved. The surface conformation and properties of such fibres will be different compared to when only CMC is added.

Q: How are Dry and Wet Strength Agents Applied?

A: These agents are typically added to the pulp slurry before the paper is formed on the paper machine. The exact point of addition can vary, but they are often added in the headbox, which is the part of the machine where the pulp is distributed onto the forming wire. The agents are usually added in liquid form and mixed thoroughly to ensure uniform distribution.

Q: What Factors Influence the Selection of Dry and Wet Strength Agents?

A: The choice of strength agents is influenced by several factors, including the type of paper being produced, the desired end-use properties, the pH of the papermaking process, and environmental considerations. For instance, some agents may be more effective for high-yield pulp papers, while others are better suited for bleached chemical pulps.

Q: Are Dry and Wet Strength Agents Environmentally Friendly?

A: The environmental impact of strength agents depends on the specific chemical used. Some agents, like cationic starches, are biodegradable and considered more environmentally friendly. Others, like certain synthetic polymers, may have a higher environmental impact due to their persistence in the environment. The paper industry is continually seeking to develop and use more sustainable and eco-friendly strength agents.

Q: Can Dry and Wet Strength Agents Affect Paper Recyclability?

A: Yes, the use of strength agents can affect the recyclability of paper. Some agents, especially synthetic polymers, can remain in the paper fibers even after multiple recycling cycles, potentially affecting the quality of the recycled paper. However, many papermakers are now using more recyclable and biodegradable strength agents to mitigate this issue.

Q: How do Dry and Wet Strength Agents Affect Paper Performance?

A: Dry strength agents improve the handling and durability of paper products, making them less prone to tearing or breaking under dry conditions. Wet strength agents allow paper products to maintain their strength when wet, which is crucial for items like paper towels and tissues that are designed to absorb moisture without disintegrating.

Q: Are there any Health Concerns with Dry and Wet Strength Agents?

A: Most dry and wet strength agents used in the paper industry are safe and pose minimal health risks when used properly. However, some agents may contain formaldehyde, which is a known human carcinogen. The paper industry has strict guidelines and regulations to ensure that the levels of any potentially harmful substances are kept to a minimum.

Q: How do Dry and Wet Strength Agents Affect the Cost of Papermaking?

A: The use of strength agents can increase the cost of paper production due to the cost of the agents themselves and the additional processing steps required. However, these agents often result in higher quality paper products that can command premium prices, potentially offsetting the additional costs.

Q: What is AKD Sizing Promoter?

A: AKD (Alkenyl Succinic Anhydride) Sizing Promoter is a chemical additive used in the papermaking process to enhance the effectiveness of AKD sizing. It helps in the efficient and uniform distribution of AKD on the paper fibers, improving the internal and surface sizing of the paper. This results in better printability, ink absorption, and resistance to water and oils.

Q: How does AKD Sizing Promoter work?

A: AKD Sizing Promoter facilitates the chemical reaction between AKD and cellulose fibers in the paper pulp. It acts as a bridge or catalyst, ensuring that AKD molecules are more readily attached to the cellulose fibers, thus improving the sizing efficiency. This leads to a more uniform and effective sizing, which is crucial for high-quality printing papers.

Q: When should AKD Sizing Promoter be added in the papermaking process?

A: The promoter is typically added to the pulp before the AKD sizing agent. It's important that the promoter is well distributed in the pulp to ensure it can interact with the fibers effectively. The exact timing and point of addition can vary depending on the specifics of the papermaking system, but it's usually added at the wet end of the paper machine.

Q: Are there any environmental concerns associated with AKD Sizing Promoters?

A: The environmental impact of AKD Sizing Promoters depends on the specific chemical used. Many modern promoters are designed to be biodegradable and have low toxicity to minimize their environmental footprint. However, proper waste management practices are still necessary to ensure that any byproducts or unused chemicals are disposed of safely.

Q: Can AKD Sizing Promoter affect the recyclability of paper?

A: The use of AKD Sizing Promoter, like any chemical additive in papermaking, can potentially affect the recyclability of the paper. Some promoters may remain in the paper fibers and affect the quality of the pulp during the recycling process. However, the impact is typically minimal, and many paper mills have systems in place to mitigate these effects.

Q: How is the effectiveness of AKD Sizing Promoter measured?

A: The effectiveness of AKD Sizing Promoter is usually measured by evaluating the sizing properties of the paper. This includes tests to determine water and oil resistance, ink absorption, and other surface properties. The amount of AKD used and the overall quality of the paper can also indicate the promoter's effectiveness.

Q: Are there alternatives to AKD Sizing Promoters?

A: Yes, there are alternative sizing systems that can be used in papermaking, such as rosin ester sizing or synthetic polymer sizing. Each system has its own advantages and disadvantages, and the choice of sizing system often depends on the specific requirements of the paper product and the capabilities of the paper mill.

Q: How do I choose the right AKD Sizing Promoter for my application?

A: Choosing the right AKD Sizing Promoter involves considering several factors, including the type of paper being produced, the characteristics of the pulp, the desired end-use properties of the paper, and the specific AKD sizing agent being used. It's often beneficial to consult with a chemical supplier or a papermaking expert to determine the most suitable promoter for your needs.

We're professional pulp & paper additives manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy discount pulp & paper additives made in China here from our factory. Contact us for free sample.

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