DEK printer parts smt Scraper Blade

1. Product Overview and Core Function

1.1 Core Function of Scraper Blade

DEK printer scraper blade is the core executive component in solder paste printing process, directly affecting:

Uniformity of solder paste deposition

Precision of printed graphics

Consistency of pad coverage

Process stability

1.2 Typical application scenarios

High-density interconnect (HDI) board printing

Fine-pitch components (below 0.3mm pitch)

Mixed packaging process (solder paste + red glue)

High-precision packaging (CSP/BGA)

2. Working principle and physical properties

2.1 Working principle

Shearing action:

The scraper contacts the steel mesh at an angle of 45-60°

Produces a high shear rate of 2000-5000s⁻¹

Makes the solder paste flow thixotropicallyFilling stage:

The scraper pushes the solder paste to fill the mesh

The optimal filling pressure range is 30-100N

Release stage:

Micron-sized solder paste columns are formed when the steel mesh is separated

The release angle affects the demolding quality

2.2 Key physical parameters

Parameter Standard value Allowable deviation

Hardness (Shore A) 75-90 ±5

Elastic modulus 3-8MPa ±10%

Surface roughness (Ra) ≤0.2μm +0.05μm

Temperature range -20℃~120℃ Short-term tolerance +20℃

Wear resistance coefficient ≤0.15 (ASTM D1044) +0.03

III. Product classification and technical features

3.1 Material type comparison

Type Polyurethane (PU) Metal scraper Composite material

Hardness 75-90A HRC60-65 85A (surface)

Life 500,000-1 million times 5 million times + 2 million-3 million times

Applicable solder paste Conventional SnPb/lead-free High viscosity solder paste Nano silver paste

Cost Low High Medium

Features Easy to replace, strong versatility Ultra-high precision Anti-static design

3.2 DEK-specific design features

Blade geometry optimization:

Double bevel design (front angle 25° + back angle 15°)

Blade straightness ≤0.01mm/300mm

Dynamic compensation structure:

Pressure adaptive adjustment

Temperature deformation compensation

Special interface:

Quick-release mounting slot

Fool-proof positioning design

IV. Process influence and core functions

4.1 Impact on printing quality

Thickness control:

Blade wear 0.1mm → Solder paste thickness change ±5μm

Optimal wear limit: ≤0.3mm

Graphic quality:

Blade defects cause:

Pull tip (>30° scraper angle)

Depression (insufficient pressure)

Tail (return speed is too fast)

Process window:

python

# Typical process parameter range

{

"pressure": 50-80N, # Printing pressure

"speed": 20-80mm/s", # Scraper speed

"angle": 45-60°, # Contact angle

"overlap": 0.5-2mm # Steel mesh coverage

}

4.2 Core function realization

Precision measurement:

Control solder paste transfer amount (60-90% mesh volume)

Thickness deviation ≤±5μm (CPK≥1.67)

Surface leveling:

Eliminate residual solder paste on steel mesh

Surface flatness ≤2μm

Shear activation:

Reduce solder paste viscosity (thixotropy ≥85%)

V. Advantage analysis and technological innovation

5.1 Competitive advantage

Precision advantage

Achieve ±15μm printing repeatability

Support 01005 component printing

Life advantage:

Polyurethane scraper life extended by 50% (compared to industry standards)

Metal scraper can be flipped for use

Compatibility advantage:

Adapt to all DEK printing models

Support nano coating treatment

5.2 Technological innovation

Gradient hardness technology:

Edge hardness 90A → Body hardness 75A

Reduce stress concentration

Microtexture technology:

Laser processing micron-level grooves

Reduce friction coefficient by 30%

Intelligent wear monitoring:

Embedded RFID chip

Record the number of times used in real time

VI. Maintenance and troubleshooting

6.1 Daily maintenance specifications

Item Method Cycle

Cleaning the cutting edge Dust-free cloth + IPA (99.7%) Every shift

Check wear Optical comparator measurement Weekly

Hardness test Shore A hardness tester (three-point measurement method) Monthly

Stress release Hang and stand for 24 hours Quarterly

6.2 Common fault handling

Fault phenomenon Cause analysis Solution

Uneven solder paste thickness Cutting edge wear/deformation Replace scraper

Printing tip Too large angle/cutting edge burr Adjust angle to 50°

Misprinting Insufficient pressure/low hardness Increase pressure by 10-15N

Scraper jump Loose installation/bearing wear Tighten and lubricate the guide rail

6.3 Life management strategy

Wear monitoring standards:

Polyurethane: Replace when edge wear > 0.3mm

Metal: Replace when edge damage is visible

Refurbishment and reuse:

Metal scrapers can be ground and repaired (≤ 3 times)

Polyurethane scraper edge trimming (special equipment)

VII. Process optimization suggestions

7.1 Parameter matching principle

Speed-pressure relationship:

text

Low speed (20-40mm/s): high pressure (70-100N)

High speed (60-80mm/s): low pressure (40-60N)

Angle selection guide:

Fine pitch: 60° (reduce tailing)

Large pad: 45° (enhanced filling)

7.2 Special process application

Step steel screen printing:

Use double hardness scraper

Front section 75A/rear section 85A

Ultra-fine pitch printing:

Use diamond coated scraper

Surface roughness ≤0.05μm

High viscosity solder paste:

Recommend metal scraper

Pressure increased by 20-30%

VIII. Technology development trend

8.1 Material innovation

Graphene enhanced polyurethane (wear resistance +200%)

Self-healing elastomer material

8.2 Intelligent upgrade

Integrated pressure sensor (real-time feedback)

Temperature-pressure coordinated control

8.3 Green manufacturing

Biodegradable scraper material

Dry cleaning technology (reduce IPA use)

IX. Selection and use recommendations

9.1 Selection matrix

Application scenario Recommended type Life expectancy

Mass production Metal scraper 6-12 months

High mix production Polyurethane scraper 1-3 months

Special alloy solder paste Ceramic coated scraper 3-6 months

R&D trial production Composite scraper, flexible replacement

9.2 Precautions for use

Installation specification:

Use torque wrench (5-8N·m)

Confirm parallelism (≤0.02mm)

Storage conditions:

Store away from light (UV protection)

Place horizontally (anti-deformation)

Scrap standard:

Polyurethane: hardness change ±10%

Metal: edge chipping>0.1mm

Ten. Summary

As a key consumable for precision printing, the technological development of DEK printing machine scraper blade presents:

High precision: support components below 01005

Long life: metal scraper life exceeds 10 million times

Intelligent: integrated sensing and feedback functions

Best practice recommendations:

Establish scraper life cycle archive

Implement preventive replacement system

Carry out process parameter DOE optimization

In the future, with the development of 5G/6G, advanced packaging and other technologies, scraper technology will continue to evolve towards ultra-precision, multi-function and sustainable directions.