Fishing Net Heat Setting: What Are YOKO and TATE?

Fishing Net Heat Setting: What Are YOKO and TATE?

In the fishing net industry, heat setting is an important finishing process used to improve the dimensional stability, mesh shape, and overall consistency of fishing netting.

Depending on the direction in which the net is stretched and stabilized, heat setting is commonly divided into two types:

• YOKO – Transverse Setting / Depthway Stretched

• TATE – Longitudinal Setting / Lengthway Stretched

The terms YOKO and TATE are widely used in the fishing net industry and originate from Japanese terminology. YOKO (横) means "horizontal" or "across," while TATE (縦) means "vertical" or "lengthwise."

Understanding the difference between YOKO and TATE is important when specifying fishing nets for commercial fishing, aquaculture, trawling, seine fishing, and other applications.

1. What Is Heat Setting in Fishing Nets?

Fishing netting is manufactured from synthetic fibers such as nylon (polyamide), polyester, PE, and HDPE.

During yarn production and net manufacturing, the material may retain internal stress caused by processes such as:

• Yarn drawing and stretching

• Twisting

• Knotting or knitting

• Net formation

• Mechanical stretching

• Previous thermal processing

If this internal stress is not properly controlled, the finished net may experience dimensional changes when it is exposed to tension, heat, water, or long-term use.

Heat setting is a controlled finishing process that uses a combination of temperature, tension, time, and speed to stabilize the net structure.

The main objectives are to improve:

• Dimensional stability

• Mesh size consistency

• Mesh shape retention

• Width and length stability

• Resistance to shrinkage

• Resistance to deformation

• Production consistency

Heat setting does not simply mean "making the net stronger." Its primary purpose is to stabilize the physical dimensions and structure of the net.

2. What Is YOKO Setting?

YOKO = Transverse Setting = Depthway Stretched

YOKO is a Japanese-derived term commonly used in the fishing net industry.

The Japanese word YOKO (横) refers to the horizontal or transverse direction.

In English, YOKO setting can be described as:

Transverse Setting
or
Depthway Stretched

YOKO setting primarily controls the net in the transverse direction, across the depth or width of the net.

Depending on the type of net, this direction may also be described as the depthway direction.

What Does YOKO Setting Do?

YOKO setting is mainly used to control:

• Net depth or width

• Transverse shrinkage

• Mesh dimensions in the transverse direction

• Mesh shape

• Lateral dimensional stability

• Overall net geometry

For example, if a fishing net is manufactured to a specified depth but tends to shrink after production, proper YOKO setting can help stabilize the finished dimension.

This is particularly important for fishing nets where accurate net depth and mesh configuration are required.

3. What Is TATE Setting?

TATE = Longitudinal Setting = Lengthway Stretched

TATE is another Japanese-derived term commonly used in the fishing net industry.

The Japanese word TATE (縦) refers to the vertical or longitudinal direction.

In English, TATE setting can be described as:

Longitudinal Setting
or
Lengthway Stretched

TATE setting primarily controls the net in the longitudinal direction, along the length of the net.

What Does TATE Setting Do?

TATE setting is mainly used to control:

• Net length

• Lengthwise shrinkage

• Longitudinal dimensional stability

• Mesh dimensions along the length

• Stretch and deformation under tension

For fishing nets subjected to significant pulling forces, towing forces, or repeated loading, longitudinal dimensional stability can be particularly important.

4. YOKO vs. TATE: What Is the Difference?

The basic difference can be summarized as follows:

In simple terms:

YOKO controls the net from side to side.

TATE controls the net from end to end.

However, fishing netting is a flexible three-dimensional structure. Therefore, YOKO and TATE are not completely independent. Changes in one direction can influence mesh shape and dimensions in the other direction.

Professional manufacturers therefore need to carefully balance both directions during the setting process.

5. Why Are YOKO and TATE Important for Fishing Nets?

The dimensions of a fishing net are not determined only by the original yarn specification.

The final dimensions can also be affected by:

• Yarn material

• Yarn diameter or denier

• Number of plies

• Net construction

• Mesh size

• Knot type

• Netting machine

• Stretching tension

• Heat-setting temperature

• Setting time

• Production speed

• Finishing conditions

For this reason, two nets made from the same yarn can potentially have different dimensional stability if their processing conditions are different.

Proper YOKO and TATE setting helps manufacturers achieve a more predictable finished product.

6. How Does Heat Setting Affect Mesh Size?

Mesh size is one of the most important specifications of fishing netting.

If a net has not been properly stabilized, the mesh can change when the net is stretched, relaxed, wet, dried, or subjected to continuous tension.

For example, a net may have the correct mesh size immediately after production but experience dimensional changes during subsequent processing or use.

Proper heat setting helps stabilize the mesh structure and reduce unwanted dimensional changes.

However, it is important to understand that heat setting does not automatically guarantee a specific mesh size.

Mesh size also depends on the net construction, yarn specification, knot configuration, stretching conditions, and measurement method.

7. YOKO and TATE in Knotted and Knotless Nets

The concept of directional setting applies to different types of fishing netting, including:

• Knotted nylon fishing nets

• Knotless fishing nets

• Nylon multifilament nets

• Nylon monofilament nets

• Polyester fishing nets

• PE fishing nets

• HDPE netting

• Raschel nets

• Trawl nets

• Gill nets

• Seine nets

• Aquaculture nets

The exact terminology and manufacturing method may vary between manufacturers and markets.

For this reason, when placing an order, buyers should confirm the meaning of YOKO, TATE, depthway stretched, and lengthway stretched with the supplier.

This helps avoid misunderstandings, especially when customers and manufacturers use different technical terminology.

8. Does YOKO or TATE Make a Fishing Net Stronger?

Not necessarily.

This is an important technical point.

YOKO and TATE primarily describe the direction of stretching and dimensional stabilization. They should not be interpreted simply as different grades of strength.

The breaking strength of a fishing net is affected by many factors, including:

• Polymer material

• Yarn diameter

• Denier

• Number of filaments

• Number of plies

• Knot construction

• Mesh size

• Net construction

• Processing conditions

• Finishing process

Proper setting can help the net maintain its intended structure and performance, but a higher setting temperature or greater stretching does not automatically mean higher breaking strength.

In some cases, excessive temperature or inappropriate tension can even negatively affect the physical properties of synthetic fibers.

Therefore, heat-setting conditions must be carefully controlled.

9. Heat Setting of Nylon Fishing Nets

Nylon is one of the most widely used materials for fishing nets.

Because nylon is a thermoplastic polymer, its dimensional stability can be influenced by temperature, tension, moisture, and processing history.

For nylon fishing nets, the heat-setting process must be carefully controlled.

Important parameters include:

Temperature + Tension + Time + Production Speed

An appropriate combination of these parameters helps stabilize the net without unnecessarily damaging the yarn.

Different nylon materials and yarn constructions may require different processing conditions.

For example, nylon monofilament and nylon multifilament fishing nets should not automatically be processed using exactly the same setting conditions.

10. YOKO and TATE for Commercial Fishing Applications

Dimensional stability becomes especially important for commercial fishing nets.

During operation, fishing nets can experience:

• High tension

• Towing forces

• Water resistance

• Heavy catches

• Repeated loading

• Abrasion

• Long periods of immersion

• Changes in temperature and moisture

If the net changes significantly in length, depth, or mesh dimensions during operation, the performance of the fishing system may also be affected.

For this reason, commercial fishing net manufacturers need to consider both YOKO and TATE when designing and finishing netting.

A well-controlled setting process helps produce netting with more consistent dimensions and predictable behavior.

11. How Should Buyers Specify YOKO and TATE?

When purchasing fishing netting, simply specifying the mesh size and yarn specification may not always be sufficient.

Professional buyers can also ask the manufacturer about:

1. Material: Nylon, polyester, PE, HDPE, etc.

2. Yarn specification: Denier, diameter, or ply

3. Mesh size: Finished mesh measurement

4. Net depth: Finished depth after setting

5. Net length: Finished length after setting

6. YOKO: Transverse or depthway stretching

7. TATE: Longitudinal or lengthway stretching

8. Breaking strength: Strength of the finished net

9. Dimensional stability: Expected shrinkage or deformation

10. Testing method: How mesh size and strength are measured

Clear technical specifications can significantly reduce misunderstandings between buyers and manufacturers.

12. Why Professional Fishing Net Manufacturing Matters

A high-quality fishing net is not determined by yarn quality alone.

The final performance of a net is the result of multiple manufacturing stages:

Raw Material → Yarn → Netting → Stretching → Heat Setting → Finishing → Inspection → Packing

Each stage can influence the final product.

Among these processes, YOKO and TATE setting are important for controlling the dimensional stability and geometry of the finished netting.

Professional manufacturers need to control the entire process rather than relying on a single parameter.

Conclusion

In the fishing net industry, YOKO and TATE are important terms used to describe the directional stretching and dimensional stabilization of netting.

YOKO (横) refers to the transverse direction and is commonly described in English as Transverse Setting or Depthway Stretched.

TATE (縦) refers to the longitudinal direction and is commonly described as Longitudinal Setting or Lengthway Stretched.

In simple terms:

YOKO = Transverse / Depthway
TATE = Longitudinal / Lengthway

Both directions can influence the final mesh size, mesh shape, net dimensions, shrinkage, and dimensional stability.

For commercial fishing nets, choosing the appropriate setting conditions is an important part of achieving consistent and reliable netting performance.

When purchasing fishing nets, buyers should therefore look beyond yarn specifications alone and consider the finished mesh size, net dimensions, YOKO/TATE setting, breaking strength, and dimensional stability.

A professional fishing net manufacturer should be able to clearly explain these parameters and provide consistent production results from batch to batch.