GPPS Plate Extrusion Line

Name: GPPS Plate Extrusion Line
Brand: JWELL
SKU: gpps-plate-extrusion-line

GPPS Plate Extrusion Line: Related JWELL Extrusion Lines

The GPPS Plate Extrusion Line is part of JWELL’s complete extrusion portfolio. Customers evaluating this GPPS Plate Extrusion Line also frequently request our PS HIPS GPPS Sheet Extrusion Line | Jwell Machinery and PETG Plate Extrusion Line | Jwell Machinery, which share the same proven screw, die and control platforms. For layout drawings, pricing and lead times, contact JWELL Machinery directly.

Key Features

See Jwell GPPS Plate Extrusion Line in Action

Optical-Grade Single-Screw Extruder — 38CrMoAlA Nitrided, 120/130/150mm Screw Options

The Jwell GPPS plate extrusion line is built around a precision single-screw extruder available in 120 mm, 130 mm, and 150 mm screw diameter configurations, each engineered for the thermal and rheological demands of GPPS (General Purpose Polystyrene) processing. GPPS is an amorphous polymer with a processing temperature window of 180-220°C — narrower than many commodity thermoplastics and requiring precise temperature control to achieve the optical clarity that is GPPS’s primary value proposition. Excessive melt temperature above 230°C causes thermal degradation that appears as yellowing and micro-bubbles in the transparent plate, while insufficient melt temperature produces unmelted pellet fragments that create visible “fish eyes” in the finished product.

Jwell addresses this through a large-diameter, low-speed screw design philosophy. A 120-150 mm diameter screw running at reduced RPM delivers the same throughput as a smaller-diameter screw at high speed, but with significantly lower shear rates. This reduces melt temperature, minimizes thermal degradation, and improves plasticizing efficiency — the degree to which the polymer pellets are fully melted and homogenized before reaching the die. The result is melt with uniform temperature distribution and viscosity, which translates directly to plate with consistent optical properties across the full width and length.

The screw is manufactured from 38CrMoAlA nitrided steel with a nitrided layer depth of 0.5-0.7 mm, achieving surface hardness of HV>=740 on the screw flights and HV>=940 on the barrel interior. This nitriding treatment creates a hard, wear-resistant layer that does not chip or flake like chrome plating — a critical durability advantage for continuous GPPS production where any surface degradation creates melt stagnation zones that produce discolored streaks in transparent plate. Under standard GPPS processing conditions, the screw and barrel provide 5-7 years of service life.

The three screw diameter options provide output scalability: the 120 mm configuration typically delivers 300-450 kg/h, the 130 mm 400-550 kg/h, and the 150 mm 500-600 kg/h — allowing converters to match line capacity to their market demand and upgrade path.

配图建议: 单螺杆挤出机主机近景，标注螺杆直径和喂料系统

Precision Three-Roll Calendar — 42CrMo Rollers, HRC58-62, Ra≤0.016μm, ±0.5°C Control

The three-roll calendar is the primary determinant of GPPS plate surface quality, thickness uniformity, and optical clarity. Each roller is manufactured from 42CrMo forged steel, a chromium-molybdenum alloy steel that provides high hardenability, excellent toughness, and dimensional stability under the thermal cycling inherent in polystyrene processing.

Key roller specifications:

For GPPS transparent plate, the roller surface finish directly determines the plate’s surface quality. GPPS reproduces the roller surface with high fidelity — any imperfection on the roll surface transfers directly to the plate. Jwell’s Ra≤0.016 μm mirror finish produces GPPS plate with a glossy, glass-like surface that maximizes light transmission for lighting diffuser and display applications.

The coaxiality specification of ≤0.005 mm is critical for thickness uniformity. For thin GPPS plate (0.5-1.0 mm) used in stationery and packaging, even a 0.01 mm roll runout creates a 1-2% thickness variation visible as optical distortion in transparent plate. Jwell’s precision machining holds coaxiality to half the tolerance budget, providing margin for thermal expansion and bearing wear.

Roller temperature is controlled to ±0.5-1°C across the full face width by individual closed-loop pressurized water circuits for each roll. For GPPS, roll temperatures are typically maintained at 60-90°C — high enough to prevent the plate from “freezing” on contact before the roll gap is reached, but low enough to solidify the surface for gloss development. This temperature precision eliminates the gloss variation bands that appear as visible stripes on transparent GPPS plate when roll temperature is non-uniform.

配图建议: 三辊压光机近景，展示镜面辊筒表面

PID-Controlled Gear Pump — ±1 Bar Die Pressure for Crystal-Clear GPPS Plate

GPPS transparent plate quality demands defect-free surfaces — gels, die lines, bubble lines, and thickness bands are all immediately visible in crystal-clear polystyrene plate. Jwell’s systems-level approach to defect elimination includes a PID-controlled gear pump (melt pump) between the extruder and the die.

The melt pump absorbs the extruder’s natural pressure pulsations (±5-8 bar amplitude at the extruder head) and delivers melt to the die entry at pressure stabilized within ±1 bar. This pressure stability directly eliminates the die lines and thickness bands that pulsating melt pressure creates across the web width. The pump’s positive displacement also decouples extruder output from downstream pressure variations caused by filter screen changes or viscosity shifts, maintaining consistent plate quality throughout production campaigns.

Three melt pump options are available: Jwell self-manufactured (cost-optimized, fully supported by Jwell’s service network), Maag (Switzerland) for premium European precision, or Nordson (USA) for global serviceability. The gear pump is sized to match the line’s output range (300-600 kg/h) with minimal pressure drop, and its temperature-controlled housing prevents GPPS melt from cooling below its optimal processing viscosity in the pump chamber.

配图建议: 熔体泵安装位置示意或近景

Hydraulic Double-Position Screen Changer — Zero-Stop Production During Screen Changes

Transparent GPPS plate requires melt filtration to remove contaminants — unmelted pellet fragments, crosslinked gel particles, and foreign material — that would appear as visible specks in the crystal-clear plate. Jwell’s hydraulic screen changer provides this filtration with continuous operation capability.

Available in single-column or double-column configurations, with single-panel or double-panel designs featuring double working positions. The double-position design allows screen pack change without stopping production — while one screen is in the melt stream, the second is in standby position, and the hydraulic ram swaps them in under 2 seconds. This is critical for GPPS processing where line stoppage for screen change creates 15-30 kg of scrap from thermal transients and can cause die lines in the restarted plate.

The screen mesh is selected based on the application: finer mesh (80-120 mesh) for lighting and optical applications where even microscopic specks are visible through the transparent plate; coarser mesh (40-60 mesh) for packaging and stationery applications where minor contaminants are acceptable.

配图建议: 液压换网器近景

Technical Specifications

Extruder

Parameter	Specification
Extruder Type	Single-screw, large-diameter low-speed design
Screw Diameter Options	120 mm / 130 mm / 150 mm
Screw Material	38CrMoAlA nitrided steel
Nitrided Layer Depth	0.5-0.7 mm
Screw Surface Hardness	HV >=740
Barrel Surface Hardness	HV >=940
Feeder Type	Volumetric feeder
Design Philosophy	Large diameter, low speed, high plasticizing efficiency

Melt Pump & Screen Changer

Parameter	Specification
Melt Pump Brand Options	Jwell (self-developed) / Maag (Switzerland) / Nordson (USA)
Screen Changer Type	Hydraulic, continuous operation
Screen Changer Configuration	Single-column or double-column
Screen Panel Options	Single-panel or double-panel, double working position
Screen Change Time	<2 seconds (double-position design)

Die

Parameter	Specification
Die Type	Coat-hanger manifold, flexible-lip
Die Material	High-quality mold steel
Flow Channel Chrome Plating	0.03-0.05 mm
Die Cavity Surface Roughness	Ra 0.1 μm
Die Lip Surface Roughness	Ra 0.05 μm

Roller (Three-Roll Calendar)

Parameter	Specification
Configuration	Three-roll vertical calendar
Roll Material	42CrMo forged steel
Coaxiality	≤0.005 mm
Surface Roughness	Ra ≤0.016 μm (mirror polish)
Surface Hardness	HRC 58-62
Chrome Plating	0.08 mm
Temperature Deviation	±0.5-1°C across full face width

Production Parameters

Parameter	Specification
Materials	GPPS (General Purpose Polystyrene), HIPS (High Impact Polystyrene)
Output Capacity	300-600 kg/h (configuration & material dependent)
Plate Thickness Range	0.5-8.0 mm
Plate Width	600-1,600 mm
Thickness Tolerance	±1.5% (with optional thickness gauge)
Light Transmission	≥88% at 1mm (GPPS)
Downstream Equipment	Cooling bracket → Haul-off → Cutter → Conveyor
Control System	Centralized electrical cabinet, Siemens S7-1500 PLC
Certifications	CE, ISO 9001

Line Performance

Parameter	Specification
Total Installed Power	200-380 kW (configuration dependent)
Control System	Siemens S7-1500 PLC + 15″ HMI
Recipe Storage	Configurable slots, time-stamped parameter logging
Process Parameters Logged	50+ at 10-second intervals

Certifications & Utilities

Parameter	Specification
Certifications	CE, ISO 9001
Available as	Complete line turnkey solution
After-Sales	Global engineer certification system, 48-hour spare parts dispatch

[I] MATERIAL COMPARISON — GPPS vs HIPS vs PMMA

Property	GPPS (Crystal PS) / HIPS (High Impact PS) / PMMA (Acrylic)
Transparency	Transparent (≥88%) ✅ / Opaque ❌ / Transparent (≥92%) ✅
Impact Strength (Izod, J/m)	15-20 (brittle) ❌ / 80-150 (tough) ✅ / 15-20 (brittle)
Material Cost (relative)	0.6-0.7× (lowest) ✅ / 0.7-0.8× / 1.0× (baseline)
Light Transmission	≥88% / N/A (opaque) / ≥92% ✅
Surface Hardness	Moderate / Moderate / High (Rockwell M95) ✅
Thermoforming	Good (100-130°C) / Excellent (110-140°C) ✅ / Good (140-160°C)
UV Resistance	Poor (yellows) ❌ / Poor (yellows) ❌ / Excellent ✅
Chemical Resistance	Poor (solvents) / Poor (solvents) / Good
Engraveability	Excellent ✅ / Good / Good
Key Advantage	Lowest cost + transparency / Impact resistance + low cost / Highest clarity + UV resistance

[J] MARKET POSITION — GPPS透明板市场定位

维度	GPPS Plate 线定位 / 说明
Cost Leadership	Lowest-cost transparent plate material / 60-70% of PMMA cost, serving price-sensitive markets
Material Versatility	GPPS + HIPS dual-material / Transparent GPPS + opaque HIPS from one line
Application Breadth	Lighting + display + stationery + packaging + signage / 5 major application sectors
Output Scalability	300-600 kg/h, 3 screw options / 120/130/150mm screw for demand-matched capacity
Optical Quality	≥88% transmission, Ra≤0.016μm / Crystal-clear plate at commodity pricing
Fabrication Ease	Cut, drill, engrave, thermoform, solvent bond / Standard fabrication tools, no specialized equipment

[L] RELATED PRODUCTS 相关产品

卡片	产品名称 / 链接 / 关系
1	PS/HIPS/GPPS Sheet Extrusion Line / /sheet-extrusion/ps-hips-gpps-sheet-extrusion-line/ / 同材料薄片产线，互补厚度范围
2	PMMA Plate Extrusion Line / /sheet-extrusion/pmma-plate-extrusion-line/ / 同类透明厚板，高端替代材料
3	PETG Plate Extrusion Line / /sheet-extrusion/petg-plate-extrusion-line/ / 同类透明厚板，耐冲替代材料

[N] INQUIRY FORM 询价表单

#	字段 / 类型 / 必填 / 说明
1	Name / text / ✅ / placeholder: “Your full name”
2	Email / email / ✅ / placeholder: “your@company.com”
3	Country / select / ✅ / 200+国家
4	Phone / tel / — / 含国际区号
5	Company / text / — / placeholder: “Your company name”
6	Target Material / select / ✅ / GPPS / HIPS / GPPS+HIPS / Not sure
7	Application / select / ✅ / Lighting Diffusers / Display & Stage Props / Stationery & Packaging / Signage / Multiple / Other
8	Required Output (kg/h) / select / ✅ / <300 / 300-450 / 450-600 / >600 / Not sure
9	Plate Thickness (mm) / select / — / 0.5-2 / 2-4 / 4-6 / 6-8 / Not sure
10	Required Plate Width (mm) / select / — / <600 / 600-1000 / 1000-1600 / >1600 / Not sure
11	Screw Diameter Preference / select / — / 120mm / 130mm / 150mm / Not sure / Recommend for me
12	Melt Pump Preference / select / — / Jwell / Maag (Switzerland) / Nordson (USA) / Not sure / Recommend for me
13	Message / textarea / — / placeholder: “Tell us about your production requirements, target markets, and any special material grades…”
—	CAPTCHA / — / ✅ / reCAPTCHA v3
—	Submit / submit / — / “Request Quote & Configuration”

4.1 On-Page 元素

#	检查项 / 状态
1	唯一 H1，含完整产品名 + 核心关键词 / ✅
2	H2 技术关键词覆盖: GPPS, crystal polystyrene, transparent plate, single-screw, melt pump, 42CrMo roller / ✅
3	规格表为 HTML <table> 文本 / ✅
4	所有图片有描述性 alt 属性 / ✅
5	面包屑用 Schema BreadcrumbList / ✅
6	FAQ 用 Schema FAQPage (6个Q&A) / ✅
7	产品信息用 Schema Product + 详细 Organization / ✅
8	视频用 Schema VideoObject + 本站托管 / ✅
9	Material Comparison 区块覆盖 GPPS/HIPS/PMMA 对比关键词 / ✅
10	Canonical 自引用 / ✅
11	Title tag 50-60 chars / ✅
12	Meta description 含性能数据 + 关键词 / ✅
13	Open Graph 完整 / ✅

4.2 E-E-A-T 信号强化

信号	体现方式
Experience	25000+ 产线交付、29年行业经验、120+国家安装
Expertise	38CrMoAlA氮化螺杆自研、42CrMo镜面辊筒Ra≤0.016μm全自产、GPPS/HIPS双材料平台、1000+专利
Authoritativeness	8大生产基地、3500员工、$700M年营收、ISO/CE认证
Trustworthiness	CE + ISO 9001认证、全球工程师认证体系、48小时备件发货、FAT出厂检测

4.3 技术性能

检查项	目标值
LCP	< 2.5s
CLS	< 0.1
INP	< 200ms
Mobile-friendly	✅
图片格式	WebP (待补充)

5.1 已有图片资源

文件夹	文件 / 用途 / 状态
主图/	— / — / ❌ 空文件夹，需补充主图
详情图/	— / — / ❌ 空文件夹，需补充应用场景图

5.2 已有视频资源

文件	用途 / 状态
视频/GPPS Plate Extrusion Line SAT.mp4	[D] SAT 视频 / ✅

5.3 尚需补充的资源

用途	建议 / 优先级
Hero 主图 ×2	GPPS整线全景 + 主机特写 / 高
应用场景图 ×4	照明扩散板 / 展示道具 / 文具包装 / 标牌雕刻 / 高
F1 单螺杆主机配图	挤出机主机 + 螺杆特写 / 高
F2 三辊压光配图	压光辊近景 / 高
F3 熔体泵配图	熔体泵安装位置 / 中
F4 换网器配图	液压换网器近景 / 中
F5 T-die配图	T-die 近景 / 中
F6 全球组件配图	电控柜 + 品牌 logo 组合 / 低
SAT 视频封面图	GPPS plate SAT 视频 poster 图 / 高
相关产品卡片图	PS Sheet/PMMA Plate/PETG Plate 缩略图 / 中

本页链接到 (Outbound)

目标页面	位置 / 锚文本
PS/HIPS/GPPS Sheet Line	[L] Related Products / “PS/HIPS/GPPS Sheet Extrusion Line”
PMMA Plate Line	[L] Related Products / “PMMA Plate Extrusion Line”
PETG Plate Line	[L] Related Products / “PETG Plate Extrusion Line”
Sheet Extrusion Pillar Page	[A] Breadcrumb / “Sheet Extrusion”

从其他页面链接到本页 (Inbound)

来源页面	链接上下文
Sheet Extrusion Pillar Page	片材挤出分类页
Lighting Materials Overview	照明材料概览页
GPPS vs HIPS vs PMMA Comparison Guide	透明塑料对比选择页
PS/HIPS/GPPS Sheet Extrusion Line	厚板/薄片产线对比

八、与 ABS 线页面结构的关键差异

维度	ABS 线 / GPPS Plate 线
Hero 卖点重点	市场份额 + 客户规模（90%份额 + 300线 + 海尔） / 材料特性 + 成本优势（88%透明 + GPPS/HIPS双材料 + 3螺杆选项）
标签页数	5 个 (+Case Studies) / 4 个（无Case Studies）
功能区块	8 个（冰箱高产能 + 自动化堆垛 + 共挤） / 6 个（挤出 + 辊筒 + 熔体泵 + 换网 + T-die + 全球组件）
视频数	2 个 (FAT + 案例) / 1 个 (SAT only)
独特区块	Case Studies [I] + Market Position (客户数据) / Material Comparison [I] (GPPS vs HIPS vs PMMA)
FAQ 重点	冰箱线产能 + ABS干燥 + 全球服务 / GPPS vs HIPS差异 + 厚度宽度 + GPPS脆性处理 + PMMA兼容性
表单字段	11 个 (Application + Timeline) / 13 个 (+Plate Width + Screw/Melt Pump Preference)
E-E-A-T 重心	市场地位 + 规模验证 / 材料专业性 + 成本定位
特色数据	300+冰箱线 + 90%份额 + 海尔20年 / 88%透明 + 0.5-8mm + 3螺杆选项 + GPPS/HIPS双材料
应用首位	Refrigeration (冰箱板) / Lighting Diffuser Panels (照明扩散板)
产能定位	300-3000 kg/h (volume-driven) / 300-600 kg/h (cost-efficient)
厚度范围	0.5-6.0 mm / 0.5-8.0 mm

Lighting Diffuser Panels — Transparent GPPS Plate for LED & Fluorescent Light Covers

GPPS transparent plate at 1-3 mm thickness is the industry-standard material for lighting diffuser panels — the transparent or frosted covers on LED lighting fixtures, ceiling light panels, and fluorescent tube diffusers that distribute light evenly while protecting the light source. GPPS’s light transmission above 88% maximizes light output efficiency, while its rigidity provides the structural support needed for ceiling-mounted panels spanning 600-1200 mm.

For frosted diffuser applications, the Jwell line can produce GPPS plate with a matte surface by using rollers with a fine matte finish (Ra 0.3-0.8 μm) instead of the standard mirror polish. This eliminates the need for secondary surface treatment to achieve light diffusion, reducing production cost and ensuring uniform diffusion characteristics across the full plate surface.

The line’s precision roller system (coaxiality ≤0.005 mm, ±0.5°C temperature control) produces GPPS plate with the consistent thickness and surface quality that lighting fixture manufacturers require — thickness variation causes uneven light distribution visible as bright and dark zones in the illuminated panel.

Display & Stage Props — Crystal-Clear GPPS Plate for Exhibition & Retail Visual Merchandising

GPPS transparent plate at 2-6 mm thickness serves exhibition display manufacturers, stage design companies, and retail visual merchandising firms who need crystal-clear panels for display cases, product risers, transparent shelving, and stage scenery elements. GPPS’s glass-like clarity at lower cost than acrylic or glass makes it the preferred material for short-term display applications where premium optical quality is desired but long-term durability is not required.

The material’s rigidity and dimensional stability ensure that display panels maintain their flatness under their own weight — critical for tall display structures and hanging panels. GPPS can be cut, drilled, and solvent-bonded with standard fabrication tools, enabling rapid assembly of custom display structures without specialized equipment.

For colored display applications — tinted panels, colored shelving, branded display elements — the volumetric feeder accommodates color masterbatch dosing with PLC-stored recipes for rapid color changeover between projects.

Frequently Asked Questions

What is GPPS and how does it differ from HIPS? -

GPPS (General Purpose Polystyrene) is a transparent, rigid, and brittle polystyrene grade — also known as crystal polystyrene. Unlike HIPS (High Impact Polystyrene), which contains rubber modifiers that make it opaque and impact-resistant, GPPS is naturally transparent with light transmission above 88% but lacks impact toughness (Izod notched impact typically 15-20 J/m). GPPS is chosen when optical clarity and rigidity are more important than impact resistance. The Jwell GPPS plate line can also process HIPS with a PLC recipe change, giving converters the flexibility to serve both transparent and opaque impact-resistant markets from a single line.

What thickness and width range can the GPPS plate line produce? +

The line produces GPPS plate from 0.5 to 8.0 mm thickness with plate width from 600 to 1,600 mm. Output capacity ranges from 300 to 600 kg/h depending on screw diameter (120/130/150 mm options), material grade, plate thickness, and width. Thickness tolerance is ±1.5% with the optional online thickness gauge. The 120 mm screw typically delivers 300-450 kg/h, the 130 mm 400-550 kg/h, and the 150 mm 500-600 kg/h at full capacity.

What are the main applications of GPPS transparent plate? +

GPPS transparent plate serves five primary application categories: (1) Lighting diffuser panels — transparent or frosted plates for LED lighting fixtures, ceiling light covers, and fluorescent tube diffusers; (2) Display and stage props — transparent sheets for exhibition displays, stage scenery, and retail visual merchandising; (3) Stationery sheets — clear folders, document covers, binder inserts, and packaging blister sheets; (4) Packaging inserts — transparent thermoformed inserts for product display packaging; (5) Signage — clear backing panels for illuminated signs and engraved nameplates.

How does the Jwell GPPS plate line handle GPPS's brittleness during production? +

GPPS is inherently brittle, which creates specific handling challenges during extrusion. The Jwell line addresses this through: controlled cooling rates on the three-roll calendar and cooling bracket to prevent thermal stress; synchronized haul-off tension that avoids stretching the brittle plate beyond its elastic limit; and a cutter designed for clean fracture of PS plate rather than sawing, which generates chips and micro-cracks. The line’s PLC stores material-specific recipes with optimized screw speed, roll temperature, and line speed parameters for GPPS grades of different molecular weights and melt flow indices.

Can the GPPS plate line also process PMMA? +

The line’s single-screw architecture can process PMMA with a PLC recipe change, as both GPPS and PMMA are amorphous polymers with overlapping processing temperature ranges. However, the screw geometry is optimized for GPPS’s lower melt viscosity. For converters primarily producing PMMA plate, Jwell recommends the dedicated PMMA Plate Extrusion Line with a screw geometry optimized for PMMA’s higher melt viscosity. For converters serving both GPPS and HIPS markets — the most common dual-material scenario — the GPPS plate line is an ideal platform.