MDO Preheating Rolls Key Heating Components for BOPP and BOPET Biaxial Film Stretching Production Lines

1 Introduction

For enterprises equipped with biaxially oriented plastic film production lines, MDO preheating roll is an indispensable core heating component in the longitudinal stretching section. Standardized and stable preheating treatment is the premise to realize uniform longitudinal stretching of film substrates, which can comprehensively optimize the physical properties of finished films and improve the market competitiveness of packaging film products. This paper systematically expounds the core processing value of MDO preheating rolls, three customized surface coating types, complete precision manufacturing standards, and a full series of alternative heating roll products for multiple industries.

2 Core Processing Functions of MDO Preheating rolls

The MDO preheating roll is installed at the front end of the longitudinal stretching section of polyfilm production equipment, which evenly heats the raw film before stretching. The moderate thermal softening effect enables the film to complete uniform plastic deformation in the subsequent stretching process, bringing three obvious quality improvements to finished products: First, the tensile strength and rigidity of the film are significantly improved, and the finished film can maintain stable performance in multiple secondary processing links without damage. Second, the optical performance indicators such as transparency and surface gloss of the film are optimized, which greatly improves the appearance quality and added value of packaging film products. Third, the film has better heat sealing performance and ink adsorption capacity, which expands the applicable scenarios of finished products in printing, compound and other post-processing procedures.

3 Three Optional Surface Coating Types for MDO Preheating rolls

Different surface coating processes are matched according to the production parameters of BOPP and BOPET film lines to meet differentiated production demands:

1.Teflon coated MDO preheating roll Applicable to BOPP film production lines, the standard specification range is 614mm × 900mm to 614mm × 1500mm, with anti-adhesion and easy-release surface characteristics.

2.Hard chrome plated MDO preheating roll Adopts the same size specification as Teflon coated rolls, suitable for high-load continuous BOPP stretching production, with high wear resistance and long service life.

3.Ceramic coated MDO preheating roll Mainly used for wide-width BOPET film production lines, the mainstream standard specification is Φ350mm × 3300mm, with excellent high temperature and oxidation resistance.

4 Complete Precision Technical Parameters of MDO Preheating rolls

All MDO preheating rolls adopt heavy-duty double-shell integral structure and strict precision control to adapt to long-term high-speed continuous operation: The inner and outer barrels, side discs and roll shafts are all made of Q345B steel, and the shaft and disc components are processed by interference assembly and full welding process. Independent welded heat circulation channels are reserved between the inner and outer shells to ensure uniform heat distribution on the whole roll surface. Geometric precision indicators: total runout ≤0.01mm, cylindricity ≤0.01mm; dynamic balance grade reaches G2.5 to eliminate vibration under the maximum operating speed of the production line.

4.1 Parameter Index of Two Main Surface Coatings

1.Hard chrome coating Coating thickness range: 150μm–200μm; surface hardness: HRC 68–70; surface roughness Ra: 0.01μm–0.02μm

2.Teflon coating Optional green or black coating surface; hardness index: HB 220–250 V; coating thickness: 80μm–100μm; standard roughness Ra: 0.1μm–0.4μm; ultra-smooth customized Ra range 0.03μm–0.4μm is available for special process demands.

5 Full Range of Supporting Industrial Heating roll Products

In addition to MDO preheating rolls dedicated to biaxial film stretching, the company supplies diversified heating roll products covering multiple processing industries to meet cross-industry equipment matching demands: Induction heating rolls: with low energy consumption and low maintenance frequency, with high safety performance in long-term operation Steam dryer cylinders: customized supporting equipment for various paper production lines Oil-water circulation heating rolls: general heating components for all kinds of flexible web processing equipment Thermal oil calender rolls: special heating equipment for hot forming of nonwoven fabrics

6 Customized Equipment Matching Service

As a comprehensive professional heating roll manufacturer, we provide integrated services including customized design, production manufacturing and after-sales technical support for all types of thermal processing rolls. Customers can submit production line operating parameters, film material types and required roll dimensions to obtain exclusive technical drawings and preferential quotation schemes.

Contact Information

Jenny Liu Mobile / WhatsApp: +86 17743789775 Email: sale05@huataogroup.com