What is acrylic sheet?

Acrylic Sheet (also known as PMMA) combines excellent impact resistance with superior weatherability, offering an aesthetic range that spans from crystal-clear transparency to a rich spectrum of colors. It is a versatile, general-purpose thermoplastic sheet material suitable for a wide array of applications. Acrylic sheet serves as an ideal choice for bathtubs, hot tubs, and swimming pools, making it suitable for use in virtually any setting. Its high molecular weight characteristics endow the material with exceptional processing and thermoforming capabilities. Consequently, acrylic sheet has become the recognized material of choice within industries such as sanitary ware manufacturing This article will explain three methods of manufacturing acrylic sheets.

Table of contents

• Extruded Acrylic Sheet
• Cast Acrylic Sheet

Extruded Acrylic Sheet

Raw Material Preparation and Mixing ->

Raw materials consist of granules or powder, recycled material, or a mixture of both.

—Mixing (various additives are fed into the mixing machine according to specific ratios) —Blending (thorough, uniform mixing)
—Filtration (removing potential impurities and unmelted particles from the material)

Melt Extrusion and Forming ->

—Calendering (selection of specific rollers—textured or smooth—depending on the desired finish)
—Cooling (circulating cooling water inside the calender rollers initiates preliminary cooling and solidification of the hot sheet)

Cooling, Haul-off, and Post-processing->

—Cutting and Winding (cutting to customer-specified dimensions or packaging in roll form)
—Inspection and Packaging (cut sheets undergo quality checks for thickness, dimensions, and surface defects such as scratches, bubbles, or impurities; qualified products are interleaved with protective film or paper, wrapped in kraft paper or plastic film, labeled, and prepared for shipment.)

Cast Acrylic Sheet

Prepare raw materials

The process involves adding additives—such as plasticizers, mold release agents, colorants, and a small amount of initiator—to MMA monomer, followed by stirring and heating to a suitable temperature for prepolymerization. Once the material’s viscosity reaches approximately 2 Pa·s, it is cooled, filtered, and metered; the resulting syrup is then poured into a mold, degassed, and sealed. Polymerization proceeds under staged temperature control in an oven or water bath. Finally, after demolding, the product undergoes heat treatment at a temperature above the glass transition temperature to yield the desired PMMA cast profile.

—Separate and clean the upper and lower mold sections

—Apply and secure sealing strips along the edges (select strips based on product thickness)

— Secure with clamps, leaving one side open for material (slurry) injection

— ​​Pour in the slurry

— Place in the tank; attach final clamps and insert aeration plates for venting (after all units are loaded)

— Monitor temperature for heating and allow to set (approx. 6 hours)

— Drain the water

— Activate the machine for high-temperature processing (2.5 hours)

— Allow to cool

— Hoist the finished product, remove clamps, and separate mold sections

— Quality inspection

— ​​Apply protective film

— Packaging