Digital Printing
149 文档
Transmission System Failures in High-Speed Carton Packaging Equipment: Fault Diagnosis and Mechanical Precision for Packaging Buyers
Last Updated: 2026年7月7日TL;DR High-speed carton p...
Rolling vs. Sliding Friction at the Outlet Guide: How Contact Interface Design Controls Pack Rejection Rates on High-Speed Packaging Lines
Last Updated: 2026年7月7日TL;DR Sliding friction at...
Phase-Locked Vision Inspection for Bottom-Seal Defects in Digitally Printed Packaging
Last Updated: 2026年7月7日TL;DR Automated vision-ba...
Rotary Tower Indexing Precision in Automated Gift Carton Filling Lines: A Technical Evaluation for Packaging Buyers
Last Updated: 2026年7月7日TL;DR In controlled produ...
Die-Cutting Technology for Paper Packaging: Mechanism Types, Automation Levels, and Digital Integration
Last Updated: 2026年7月26日TL;DR Full-strip die-cutt...
Varnish Coating Systems for Printed Paper Packaging: UV, Water-Based, and Pearlescent Performance Guide
Last Updated: 2026年7月26日TL;DR UV varnish curing s...
Paper-Based Leather-Grain Surface Finishing for Premium Packaging: VOC Compliance and Tactile Performance
Last Updated: 2026年7月26日TL;DR Textured leather-gr...
Food Packaging Material Safety: Chemical Migration, Detection Methods, and Supplier Qualification
Last Updated: 2026年7月26日TL;DR Migration of chemic...
Food Packaging Material Safety: Mechanical, Barrier, and Chemical Resistance Evaluation Guide
Last Updated: 2026年7月26日TL;DR Food packaging mate...
Zodiac Wine Packaging Design: Cultural Symbolism, Print Specifications, and Market Performance for Premium Gift Boxes
Last Updated: 2026年7月23日TL;DR Zodiac-themed wine ...
Digital Printing for Paper Packaging: Substrate Compatibility, Workflow Integration, and Procurement Decision Framework
Last Updated: 2026年7月23日TL;DR Digital printing el...
Waterborne Varnish Wear Resistance: Formulation Optimization for Premium Packaging Applications
Last Updated: 2026年7月22日TL;DR A wear-resistant wa...
Magnetic Powder Brake Retrofit for Roll-Fed Digital Finishing Lines: Closed-Loop Tension Control Guide
Last Updated: 2026年7月21日TL;DR Replacing a pneumat...
Digital Printing System Selection and Substrate Compatibility: A Technical Guide for Packaging Buyers
Last Updated: 2026年7月21日TL;DR Digital printing sy...
Die-Cutting Blade Specification and Substrate Matching for Folding Cartons and Rigid Box Packaging
Last Updated: 2026年7月21日TL;DR Die-cutting blade h...
Digital Foil Stamping Processes: Inkjet, DTF, Sublimation, and Laser Methods Compared
Last Updated: 2026年7月20日TL;DR The sublimation-foi...
UV-Cured Leather-Texture Screen Varnish for Folding Cartons: Process Architecture, Formulation, and Fold-Crack Prevention
Last Updated: 2026年7月20日TL;DR UV-cured screen pri...
Screen Plate Exposure Light Sources: Spectral Matching Guide for Digital and Screen Print Workflows
Last Updated: 2026年7月20日TL;DR Switching from fluo...
Velvet Touch Paper Coating Formulation: Resin Ratios, Additive Optimization, and Digital Printing Compatibility
Last Updated: 2026年7月20日TL;DR At a polycarbonate-...
Hard-Roller vs. Soft-Roller Rotary Die-Cutting: Configuration Selection and Lifecycle Cost Analysis for Corrugated and Folding Carton Converting
Last Updated: 2026年7月20日TL;DR Soft-roller rotary ...
Gold and Silver Metallic Ink Printing: Viscosity, Dampening, and Undercoat Control for Offset Packaging
Last Updated: 2026年7月19日TL;DR Gold and silver met...
Spot Color Channel Management in Digital Prepress: A Technical Guide for Packaging Buyers
Last Updated: 2026年7月19日TL;DR Spot color channels...
Hot Stamping vs. Heat Transfer: Machine Structure Selection and Substrate Compatibility Guide
Last Updated: 2026年7月19日TL;DR Cylinder-type (rota...
Hot vs Cold Foil Transfer: UV Adhesive Selection, Transfer Speed, and Substrate Compatibility for Packaging and Label Applications
Last Updated: 2026年7月18日TL;DR Cold foil transfer ...
Thick-Film Screen Printing: Plate Parameters, Ink Viscosity, and Relief Height Control for Premium Packaging
Last Updated: 2026年7月18日TL;DR Screen-printed thic...
Piezoelectric Inkjet QR Code Printing: Temperature, Voltage, and Speed Parameter Map for Packaging Quality Control
Last Updated: 2026年7月18日TL;DR Ink temperature and...
Dimensionless Number Optimization for High-Speed Inkjet QR Code Print Quality
Last Updated: 2026年7月18日TL;DR Reducing the Weber ...
QR Code Inkjet Printing Quality Control: Defect Analysis and Substrate Compatibility for Variable-Data Packaging
Last Updated: 2026年7月17日TL;DR Among all variables...
Character Illustration Systems in Digital Packaging Print: Design Parameters, Substrate Compatibility, and Print Process Selection
Last Updated: 2026年7月17日TL;DR Character-based fig...
Inline Variable QR Code Printing on Gravure Press: UV Ink, Encoder Synchronization, and Anti-Counterfeiting Integration
Last Updated: 2026年7月17日TL;DR Inline variable QR ...
Functional Ideality Scoring for Digital Packaging Line Rejection Systems: A 5-Solution Technical Evaluation
Last Updated: 2026年7月17日TL;DR In controlled line ...
Computer-Generated Holographic Security Labels: Digital Printing Workflow, Laplace Filtering, and Substrate Compatibility
Last Updated: 2026年7月17日TL;DR Computer-generated ...
Inline Inkjet Printhead Maintenance on Web Gravure: Standby-Head Substitution Architecture and Production Cost Analysis
Last Updated: 2026年7月17日TL;DR Without a standby-h...
GEO-PLA Antimicrobial Composite Films: Performance Specifications and Buyer Qualification Guide
Last Updated: 2026年7月17日TL;DR At 1% loading, ging...
Digital Watermark QR Code Security Printing: Anti-Copy Halftone Encoding for Brand Protection Packaging
Last Updated: 2026年7月17日TL;DR QR codes embedded w...
Barrier Film Selection for Modified Atmosphere Packaging: PVDC vs. PE Performance Data for Chilled Food Applications
Last Updated: 2026年7月17日TL;DR The synergistic com...
Substrate Reflectance and DPI Calibration for Digital Traceability Code Printing
Last Updated: 2026年7月17日TL;DR Substrate reflectan...
Variable Digital Printing on Aseptic Beverage Cartons: Production Performance, Ink Compliance, and Consumer Engagement
Last Updated: 2026年7月16日TL;DR Variable digital pr...
Pine Cone Essential Oil Composite Films: Antimicrobial Performance Specifications for Food Packaging Buyers
Last Updated: 2026年7月16日TL;DR Pine cone essential...
UV Inkjet vs. Laser Imaging for Digital Label Printing: Substrate Adhesion and Cost Model Analysis
Last Updated: 2026年7月16日TL;DR UV inkjet digital l...
Digital Printing System Selection for Y2K-Style Cosmetics Packaging: Substrate Compatibility and Color Management Guide
Last Updated: 2026年7月16日TL;DR High-saturation, me...
Plant Essential Oil Antibacterial Composite Films: Mechanisms, Substrates, and Active Packaging Specifications for B2B Buyers
Last Updated: 2026年7月16日TL;DR Plant essential oil...
Plant-Derived Essential Oil Active Packaging: Antimicrobial Mechanisms, Encapsulation Formats, and Shelf-Life Performance Data
Last Updated: 2026年7月16日TL;DR When plant-derived ...
Digital Printing Compatibility and Performance Qualification of Dual-Functional Intelligent Packaging Films
Last Updated: 2026年7月16日TL;DR Dual-functional pac...
Inkjet vs. Screen Printing on Metal Drinkware: Resolution, Adhesion, and Run-Length Economics
Last Updated: 2026年7月15日TL;DR Inkjet printing on ...
Digital Printability and Barrier Performance of Bio-Based LBL Coated Paper: CGG/OCNF System Evaluation
Last Updated: 2026年7月15日TL;DR Inkjet printing on ...
Color Accuracy and Process Control in Carton Printing: A Technical Guide for B2B Buyers
Last Updated: 2026年7月15日TL;DR In controlled produ...
Integrated Inkjet Coding and Inline Inspection for Variable Data Digital Printing: Architecture Selection and Supplier Qualification
Last Updated: 2026年7月16日TL;DR Integrated inkjet c...
Laser Holographic Security Packaging Print: Optical Path Correction, SNR Optimization, and Yield Rate Benchmarks
Last Updated: 2026年7月14日TL;DR Correcting optical ...
Variable QR Code Overprinting on Finished Folding Cartons: Tri-Head Inline Inkjet Process Qualification for UV-Varnished Foil Board
Last Updated: 2026年7月14日TL;DR Retrofitting variab...
Inkjet QR Code Symbol Grade Control for Packaging: Print Size, Aperture, and Pre-Cure Engineering
Last Updated: 2026年7月14日TL;DR At print sizes belo...
Polysaccharide-Essential Oil Composite Films for Active Packaging: Release Mechanisms, Barrier Performance, and Supplier Qualification
Last Updated: 2026年7月14日TL;DR Polysaccharide-esse...
Pre-Coat Film Transfer Architecture for Hybrid Digital Packaging Print Systems
Last Updated: 2026年7月14日TL;DR Pre-coated transfer...
Corrugated Flute Selection and Structural Dimension Engineering for Consumer Goods Paper Packaging
Last Updated: 2026年7月14日TL;DR Corrugated paperboa...
Essential Oil Microencapsulation for Active Antimicrobial Packaging: Preparation Methods, Wall Materials, and Performance Benchmarks
Last Updated: 2026年7月13日TL;DR Encapsulation effic...
Laser Holographic Security Printing: Techniques, Performance Benchmarks, and Buyer Specifications
Last Updated: 2026年7月13日TL;DR Laser holographic s...
Transparent Holographic Security Film: Dot Layer Fabrication Methods and Process Parameter Control
Last Updated: 2026年7月13日TL;DR Photoresist ratio i...
Color-Variable QR Codes and Specialty Security Inks: A Technical Guide to Digital Anti-Counterfeiting Print Systems
Last Updated: 2026年7月13日TL;DR Color-variable QR c...
Variable QR Code Inkjet Printing on Woven Polypropylene Bags: Substrate Compatibility, System Integration, and Field Performance
Last Updated: 2026年7月12日TL;DR Variable QR code in...
Colorized Variable QR Code Technology and Digital Security Printing: A Technical Guide for Anti-Counterfeit Packaging Buyers
Last Updated: 2026年7月12日TL;DR Colorized variable ...
Laser Holographic Transfer Film for Anti-Counterfeit Flexible Packaging: Process Selection and Optical Performance Guide
Last Updated: 2026年7月12日TL;DR Laser holographic t...
Variable QR Code Inkjet Printing Quality: A Technical Evaluation for Packaging Buyers
Last Updated: 2026年7月12日TL;DR In a controlled eva...
VOC Emissions in Variable QR Code Tobacco Label Printing: Substrate vs. Ink System Contribution
Last Updated: 2026年7月12日TL;DR Silver cardboard su...
Automated Inspection Systems for Digital Printing: Substrate Compatibility and Quality Verification Guide
Last Updated: 2026年7月12日TL;DR Automated inline in...
Controlled-Release Anti-Mold Packaging for Paper and Printed Materials: Essential Oil Sachet vs. Coated Format Performance Data
Last Updated: 2026年7月12日TL;DR Controlled-release ...
Antimicrobial Packaging Paper with Cinnamon Essential Oil: Technical Evaluation for Active Produce Packaging
Last Updated: 2026年7月11日TL;DR Antimicrobial packa...
Chitosan Composite Films with Lavender Essential Oil: Mechanical and Barrier Performance Guide for Flexible Packaging Buyers
Last Updated: 2026年7月11日TL;DR Chitosan-based comp...
Variable QR Code Printing on High-Speed Rotogravure Lines: Inline Inkjet Integration and OCR Verification
Last Updated: 2026年7月11日TL;DR Inline inkjet integ...
Multi-Layer Anti-Counterfeiting Printing for Cigarette Packaging: Holographic Foil, Variable QR Code, and Microtext Integration Parameters
Last Updated: 2026年7月11日TL;DR Among the three ant...
Electrospun Active Packaging Films: Substrate-EO Compatibility and Performance Qualification Guide
Last Updated: 2026年7月11日TL;DR In controlled evalu...
Digital Printing Substrate Compatibility and Color Calibration: A Technical Guide for Packaging Buyers
Last Updated: 2026年7月11日TL;DR Digital printing sy...
Hybrid Roller-Screen and Inkjet Overprint Ceramic Decoration: Defect Analysis and Process Control for B2B Buyers
Last Updated: 2026年7月10日TL;DR In combined roller-...
Waterborne Polyurethane Screen Printing Inks: NCO:OH Ratio, PET Adhesion, and Pigment Loading Optimization
Last Updated: 2026年7月10日TL;DR Among five PPCD-bas...
Cold Foil Stamping vs. Hot Stamping: Process Mechanics, Substrate Compatibility, and Buyer Specification Guide
Last Updated: 2026年7月8日TL;DR Cold foil transfer ...
Aesthetic vs. Functional: What Consumer Data Says About Regional Specialty Food Packaging Design
Last Updated: 2026年7月7日TL;DR In a structured con...
Functional Extension Design for Fresh Produce Packaging: Barrier Materials, Active Systems, and Smart Technology Integration
Last Updated: 2026年7月7日TL;DR Coconut shell polyp...
Recycled Paperboard Die-Cutting: Tooling Specifications, Crease Quality, and Barcode Integrity for Folding Carton Buyers
Last Updated: 2026年7月7日TL;DR Recycled paperboard...
Consumer Segmentation and Digital Printing Substrate Selection for Confectionery Packaging
Last Updated: 2026年7月7日TL;DR Consumer segmentati...
EPE Composite Insert vs. Paper Pulp Tray: Drop Test Data and Cost Optimization for Small Appliance Transport Packaging
Last Updated: 2026年7月7日TL;DR Switching from pape...
Book-Form Rigid Gift Box: Structural Engineering, Substrate Selection, and Flat-Pack Design for Premium Confectionery Packaging
Last Updated: 2026年7月7日TL;DR A book-form rigid b...
Digital Printing for Series Gift Packaging: Substrate Compatibility, Structural Format Selection, and Short-Run Converting Workflow
Last Updated: 2026年7月7日TL;DR Digital printing on...
Digital Printing for Gift Confectionery Packaging: Structural Format, Substrate Compatibility, and Surface Finishing Selection
Last Updated: 2026年7月6日TL;DR Packaging structure...
Diffraction Screen Printing for Premium Folding Cartons: Process Parameters, Substrate Compatibility, and Supplier Qualification
Last Updated: 2026年7月6日TL;DR Lenticular diffract...
Spot Color Printing for Folding Cartons: Prepress Workflow, Screening Angles, and Ink Volume Control
Last Updated: 2026年7月6日TL;DR Spot color printing...
Digital Print Quality Control Instruments: Selection Guide for Packaging Buyers
Last Updated: 2026年7月6日TL;DR Spectrodensitometer...
Three-Tier Anti-Counterfeiting Architecture for Digital Printing on Folding Cartons
Last Updated: 2026年7月6日TL;DR Multi-layer anti-co...
Folding Carton Open-Gap Defects: Fiber Direction, Tooling, and Process Variables for Buyers
Last Updated: 2026年7月6日TL;DR Fiber direction mis...
Die-Cut Fiber Tearing on Folding Cartons: Tooling Configuration Guide for B2B Buyers
Last Updated: 2026年7月6日TL;DR Die-cut fiber teari...
Facing Paper Grammage and Warp Control in E-Flute Color Box Lamination
Last Updated: 2026年7月6日TL;DR Laminated color box...
Plate-Making Technology and Prepress Workflow for Corrugated Carton Printing
Last Updated: 2026年7月6日TL;DR In corrugated carto...
Corrugated and Folding Carton Structural Design: Print Process Selection and Substrate Engineering Guide
Last Updated: 2026年7月6日TL;DR Corrugated and fold...
Crease Line Cracking in Folding Cartons: Root Causes, Process Controls, and Supplier Qualification
Last Updated: 2026年7月6日TL;DR Creasing line crack...
Foil Stamping on Tipping Paper: Process Variables, Substrate Qualification, and Supplier Evaluation
Last Updated: 2026年7月6日TL;DR Hot foil stamping o...
Folding Carton Production Quality: Die-Cut Precision, Feeder Calibration, and Board Fiber Direction
Last Updated: 2026年7月6日TL;DR Die-cut registratio...
Corrugated Carton Strength and Moisture Control: Technical Specification Guide for Transport Packaging
Last Updated: 2026年7月6日TL;DR Corrugated carton a...
Digital Printing for Illustration-Forward Packaging: Color Fidelity, Process Selection, and Series Consistency
Last Updated: 2026年7月6日TL;DR Flat-style illustra...
Digital Cold Foiling for Variable-Data Labels: Technical Evaluation and Substrate Compatibility Guide
Last Updated: 2026年7月6日TL;DR Digital cold foilin...
Digital and Specialty Print Processes for Luxury Confectionery Packaging: Emotional Resonance Through Surface Finishing
Last Updated: 2026年7月6日TL;DR Packaging design fo...
Hot Foil Stamping on Resin Dials: Process Parameters, Die Engineering, and Supplier Qualification
Last Updated: 2026年7月6日TL;DR Foil stamping on la...
Silicon-Acrylic Compound Emulsion Varnish: High-Temperature Anti-Blocking Performance for Digital Printing and Packaging Finishing
Last Updated: 2026年7月6日TL;DR When the soft/hard ...
Digital Printing Color Systems for Confectionery and Premium Packaging
Last Updated: 2026年7月6日TL;DR Packaging color str...
Digital Printing System Selection and Substrate Compatibility for Color Carton Packaging
Last Updated: 2026年7月6日TL;DR Color carton packag...
Hot Stamping Foil Process Parameters and Quality Control for Premium Packaging
Last Updated: 2026年7月6日TL;DR Hot stamping foil s...
Holographic Lithography Paper vs. Hot Foil Stamping: Technical Substitution Guide for Premium Packaging Buyers
Last Updated: 2026年7月6日TL;DR Positioned holograp...
Digital Foil Stamping Technologies: Process Selection Guide for Custom Packaging and Apparel Decoration
Last Updated: 2026年7月6日TL;DR Among the digital f...
Hot Stamping Over Water-Based Ink Prints: Process Parameter Optimization for Foil Oxidation Resistance
Last Updated: 2026年7月6日TL;DR At 100 °C stamping ...
Hot vs. Cold Foil Stamping: Process Selection, Die Quality, and Substrate Compatibility for Premium Packaging
Last Updated: 2026年7月6日TL;DR Hot foil stamping o...
Corrugated Box and Folding Carton Process Control: Compression Strength, Print Compatibility, and Finishing Qualification
Last Updated: 2026年7月6日TL;DR Corrugated box comp...
Corrugated Board Caliper, Raw Paper Quality, and Print Finishing: A Technical Procurement Guide
Last Updated: 2026年7月6日TL;DR Corrugated board th...
Corrugated Board Caliper, Edge Compression Strength, and Surface Finishing: A Technical Procurement Guide
Last Updated: 2026年7月6日TL;DR Corrugated board th...
Hot Foil Stamping: Process Configurations, Substrate Temperature Specifications, and Defect Prevention for Packaging Buyers
Last Updated: 2026年7月6日TL;DR Temperature control...
Hot Foil Stamping for Premium Packaging: Process Parameters, Die Selection, and Digital vs. Traditional Systems
Last Updated: 2026年7月6日TL;DR Hot foil stamping p...
Folding Carton Adhesive Thermal Simulation Testing: Qualification Protocol for B2B Buyers
Last Updated: 2026年7月6日TL;DR Simulation testing ...
Eco-Ink Systems for Screen Printing and Hot Stamping: UV-Cure, Water-Based, and Soy-Based Performance Comparison
Last Updated: 2026年7月6日TL;DR UV-cure eco-inks in...
Push-Pull Chocolate Box: Structural Mechanism, Anti-Theft Design, and Flat-Pack Logistics for Premium Confectionery Packaging
Last Updated: 2026年7月6日TL;DR A push-pull reveal ...
Corrugated Color Carton Specification for Export Packaging: Structural Performance, Print Process Compatibility, and Sustainability Compliance
Last Updated: 2026年7月6日TL;DR Export packaging fa...
UV Hot Stamping on Glass and Ceramic Substrates: Process Engineering and Primer Adhesion for Premium Decorative Packaging
Last Updated: 2026年7月5日TL;DR UV hot stamping on ...
Digital Printing Compatibility and Structural Performance for Paper-Based Packaging Substrates
Last Updated: 2026年7月5日TL;DR Paper-based packagi...
Digital Printing Substrate Compatibility: Ink Interaction, Color Gamut, and Durability on Coated Packaging Materials
Last Updated: 2026年7月5日TL;DR Inkjet digital prin...
Varnish Overprint and Spot-Color Matching: Measurement Geometry Effects on Kubelka-Munk Modeling
Last Updated: 2026年7月5日TL;DR Varnish overprint l...
Digital Printing on Flexible Packaging: Substrate Compatibility, Ink Adhesion, and Color Performance for Confectionery Applications
Last Updated: 2026年7月5日TL;DR Digital printing on...
UV Varnish Blocking in Rotogravure Inline Printing: Photoinitiator Formulation, Substrate Compatibility, and Storage Control
Last Updated: 2026年7月5日TL;DR UV varnish blocking...
Die-Cutting Registration and Folder-Gluer Performance: Technical Guide for Folding Carton Procurement
Last Updated: 2026年7月5日TL;DR Die-cutting registr...
Anti-Mold Varnish for Paper Packaging: Water-Based, UV, and Nano-Composite Systems Evaluated
Last Updated: 2026年7月5日TL;DR Water-based anti-mo...
Automated Adhesive-Coating and Conveyor Systems for Rigid Jewelry Packaging Boxes: PLC Control, Cycle Timing, and Mechanical Tolerances
Last Updated: 2026年7月5日TL;DR Automated adhesive-...
Process Selection for High-End Color Carton Printing: Offset, Gravure, Flexo, and Screen Compared
Last Updated: 2026年7月5日TL;DR Offset lithography ...
Wide-Format Digital Printing for Corrugated and Folding Carton Packaging: Platform Selection, Speed Modes, and Substrate Compatibility
Last Updated: 2026年7月1日TL;DR Wide-format inkjet ...
B1 Inkjet Digital Printing for Folding Cartons: Technical Evaluation of 5,500 Sheet/Hour Production Systems
Last Updated: 2026年7月1日TL;DR The Varijet 106 ope...
AI-Driven Digital Printing: Substrate Qualification, Defect Prediction, and Supply Chain Optimization for Packaging Procurement
Last Updated: 2026年6月24日TL;DR Research from a She...
Sample & Quotation Request Guide for Digital Printing
Last Updated: 2026年6月14日TL;DR: The biggest source...
Packaging Standards Explained for Digital Printing
Last Updated: 2026年6月14日TL;DR: Most packaging ten...
Digital Printing — Installation & Integration Guide
Last Updated: 2026年6月13日TL;DR: Integrating a digi...
Digital Printing — Application & Performance Guide
Last Updated: 2026年6月13日TL;DR: Digital printing p...
Digital Printing — Design Engineering Reference
Last Updated: 2026年6月13日TL;DR: Designing packagin...
Digital Printing — Lifecycle & Maintenance Guide
Last Updated: 2026年6月13日TL;DR: Digital press upti...
Digital Printing — Testing & Validation Protocol
Last Updated: 2026年6月13日TL;DR: A digital print ba...
Digital Printing — Technical Specification Overview
Last Updated: 2026年6月8日TL;DR: Choosing a digital...
Digital Printing — Troubleshooting & Failure Guide
Last Updated: 2026年6月8日TL;DR: Most digital print...
Digital Printing — Regulatory & Compliance Guide
Last Updated: 2026年6月8日TL;DR: Digital printing f...
Digital vs Offset for Packaging: Quality, Cost Crossover Point & Application Guide
Last Updated: 2026年5月31日Overview Choosing between...
Inkjet vs Toner Digital Printing for Packaging: Resolution, Speed & Cost Comparison
Last Updated: 2026年5月31日Overview Choosing between...
Digital Print for Short Run & Variable Data: MOQ, Lead Time & Personalisation Spec
Last Updated: 2026年5月31日Overview Short-run and va...