TPE is a flexible, soft material widely used in profile products such as sealing strips, decorative strips, and furniture accessories. Compared to rigid plastic profiles, TPE is more sensitive to extrusion conditions, and defects such as deformation, dimensional drift, surface stickiness, pitting, and bubbles are prone to occur during production. Finished product quality is constrained by multiple factors including raw materials, equipment, molds, process parameters, and auxiliary systems. Effective full-process control is essential for stable mass production.

Raw Material Formulation and Material State

1. Lubrication System Ratio

The amount of lubricant added directly affects the molding effect. Excessive lubrication can easily lead to profile collapse, softening, and deformation; insufficient lubrication will result in poor plasticization and a rough, dull surface, which is one of the main causes of profile appearance defects.

2. Raw Material Drying and Dehumidification

TPE raw materials are highly hygroscopic. Excessive moisture content can cause bubbles, pitting, and cross-sectional voids during extrusion, severely damaging the density and overall toughness of the profile. Proper drying pretreatment is essential before production.

3. Mixing Uniformity Control

Inhomogeneous mixing of additives and base materials can cause localized differences in material properties, leading to inconsistent melt flow rates during extrusion and resulting in quality issues such as dimensional deviations and uneven surface textures in the profiles. This can be effectively improved by using an automated, centralized compound feeding system.

4. Recycled Material Mixing Ratio

Recycled scraps from production must be processed by an energy-saving plastic recycling machine. Excessive mixing ratios or insufficient purity of recycled materials will reduce the elasticity and toughness of the profiles, causing the finished products to be prone to cracking and deformation. Strict ratio control can stabilize production quality.

Extrusion Main Equipment Operating Conditions

TPE profile extrusion requires high equipment operational stability. Screw wear, speed fluctuations, and unstable melt pressure can cause inconsistent discharge speeds, leading to uneven wall thickness and dimensional deviations. A dedicated TPE profile extruder can achieve stable plasticization, constant pressure output, and is adapted to the processing characteristics of soft, elastic materials, reducing production defects.

Die Structure and Processing Accuracy

The die is crucial for controlling the accuracy of the profile cross-section. Improper runner design, poor die surface finish, and uneven melt distribution can lead to scratches, eccentricity, and surface ripples. Dedicated molds for TPE soft materials feature smooth runners with low resistance, balancing melt flow rate and preventing deformation of the finished product during high-speed extrusion.

Matching Process Parameters and Auxiliary Equipment

TPE profile extrusion machines extrusion temperature, traction speed, and cooling/setting are interdependent. Excessive temperature can cause the profile to stick to the mold and shrink significantly; insufficient temperature leads to incomplete plasticization and reduced profile toughness. The traction speed must be matched with the extrusion speed. Asynchronous operation of traction, cooling, and cutting auxiliary equipment can pull on the unset profile, causing bending and twisting. Fluctuations in workshop temperature and humidity can also alter cooling efficiency, resulting in variations in finished product dimensions.

Conclusion

In summary, the quality of TPE profiles requires coordinated management of raw materials, equipment, molds, processes, and auxiliary equipment. Standardized production operations and regular equipment maintenance can effectively reduce the defect rate and ensure that the appearance, dimensions, and elastic properties of the profiles meet standards.

FAQ

Q1: What are the reasons why TPE profile extrusion products are prone to deformation?

A: Excessive extrusion temperature, insufficient cooling, and mismatched traction speed can all cause profile deformation.

Q2: How to improve the surface roughness of TPE profiles?

A: Optimize the formula system, polish and clean the mold, adjust the extrusion temperature, and ensure full plasticization of the material.

Q3: Can recycled materials be used directly in TPE profile production?

A: Direct use is not recommended. They should be processed through a recycling machine, and the addition ratio should be controlled to avoid reducing the elasticity of the profile.

Q4: Will unstable material supply affect the finished profile?

A: Yes, fluctuations in material supply directly cause changes in melt pressure, leading to deviations in wall thickness and dimensions.

Q5: How to improve the yield rate of TPE profile extrusion products?

A: Select suitable equipment and molds, control raw materials, stabilize process parameters, use automated feeding systems, and perform regular equipment maintenance.

Why Choose Benk Machinery?

From individual machines to complete production lines, Benk Machinery provides reliable and customized plastic processing
solutions. Since 2012, we have focused on plastic extrusion, nergy-saving plastic recycling machine, and automated compounding centralized feeding systems, helping customers build efficient and cost-effective production facilities.

• Complete Extrusion Solutions: Professional expertise in plastic pipe, profile, sheet, plate and board extrusion lines.
• Customized Project Solutions: Equipment and production lines can be configured according to your materials, products, capacity and factory requirements.
• Stable & Cost-Effective Equipment: Reliable machine performance, efficient production and optimized energy consumption help reduce operating costs.
• Professional Service: From technical consultation and production to installation, commissioning and after-sales support, our team provides complete project assistance.

Contact Benk Machinery:

PPlanning to upgrade your factory? Contact Benk Machinery for a customized project solution.
Email: [email protected]
Tel / WhatsApp: +8615950962426