i. inaccurate glue dispensing control: too much causes overflow, too little leads to insufficiency
error manifestations: oversized or undersized
glue dots; inconsistent dot shapes; overly thick, thin, or broken glue
lines; insufficient underfill or overflow.
hazards: compromises electrical connection
reliability, structural strength, and sealing performance; may cause
component misalignment, short circuits; increases material waste and
rework costs.
root causes: unstable pressure, inaccurate time control, changes in glue viscosity, worn valves, improper parameter settings.
professional solutions:
- high-precision dispensing machines: equip with
precision metering pumps (e.g., screw valves, piezoelectric valves) and
closed-loop pressure control systems to ensure highly stable and
repeatable glue output.
- dynamic viscosity compensation technology: real-time monitoring of glue viscosity and automatic parameter adjustment to address environmental or batch variations.
- regular maintenance and calibration: strictly follow manufacturer recommendations for servicing dispensing valves and fluid systems.
ii. misalignment in dispensing position: a tiny error leads to major consequences
error manifestations: glue dots/lines fail to accurately cover solder pads, bonding areas, or sealing positions; dispensing paths deviate.
hazards: fails to achieve intended bonding,
sealing, or conductive effects; may result in loose component fixation,
sealing failure, or functional abnormalities.
root causes: inaccurate fixture positioning,
insufficient equipment mechanical precision, visual positioning errors,
incorrect program coordinate settings, incoming product deviations.
professional solutions:
- high-precision motion platforms & visual systems:
adopt high-rigidity mechanical structures, precision guide rails, and
screws, paired with high-resolution industrial cameras and advanced
visual positioning algorithms (e.g., pattern matching, feature
recognition) to achieve sub-pixel-level positioning accuracy.
- accurate and reliable fixtures: ensure consistent and stable product clamping.
- program compensation & in-line inspection:
utilize software compensation functions and integrate in-line aoi
(automatic optical inspection) for real-time feedback and correction.
iii. stringing/trailing: affects aesthetics and hides risks
error manifestations: when the dispensing needle retracts, fine glue threads adhere to the product or substrate.
hazards: contaminates solder pads or component
pins, potentially causing short circuits; impairs product appearance;
broken glue strands may become foreign particles.
root causes: excessively high glue viscosity;
improper needle inner diameter selection; slow needle retraction speed;
poor off-glue delay settings; strong adhesion on needle surfaces.
professional solutions:
- optimize dispensing parameters: precisely adjust off-glue time, retraction speed, and retraction parameters (if applicable).
- select appropriate needles: choose needles with
suitable inner diameter, taper, and surface coating (e.g., teflon
coating) based on glue viscosity and dispensing volume.
- glue management: ensure glue is used within recommended temperature and viscosity ranges. consider low-stringing glue formulations.
- advanced valve technology: piezoelectric jetting valves with instantaneous shut-off capabilities significantly reduce stringing.
iv. bubble troubles: invisible defects with visible risks
error manifestations: bubbles present inside or on the surface of dispensed glue.
hazards: greatly reduces bonding strength, sealing
performance, thermal/electrical conductivity; voids formed after curing
pose long-term reliability risks.
root causes: air bubbles in glue; air ingress due
to unsealed glue buckets or tubing; turbulent flow during dispensing
entrapping air; improper glue storage/pre-treatment (e.g., lack of
degassing).
professional solutions:
- pre-dispensing glue degassing: use vacuum degassers to fully remove bubbles from glue.
- optimize fluid pathways: use low-permeability tubing, avoid excessively long or bent tubing, and ensure tight connections.
- adjust dispensing parameters: modify pressure and speed to avoid turbulence. consider pressure pots with built-in vacuum degassing.
- choose low-bubble glue: collaborate with glue suppliers to specify low-bubble requirements.
v. poor curing: the final line of defense, not to be compromised
error manifestations: incomplete glue curing,
excessively long curing time, or cured glue failing to meet performance
standards (e.g., weak strength, tackiness).
hazards: product functional failure, shortened lifespan; potential misalignment or detachment during subsequent processes.
root causes: incorrect or unstable curing
parameters (temperature, time, uv intensity); inaccurate mixing ratios
for two-part glue; expired or contaminated glue; suboptimal curing
environment (e.g., humidity).
professional solutions:
- precise curing control: use ovens with uniform
temperature distribution and uv curing equipment with stable, even
irradiation. strictly monitor and record curing parameters.
- accurate two-part glue mixing: deploy high-precision two-part metering and mixing dispensing systems to ensure precise ratios and thorough mixing.
- rigorous glue management: adhere to glue storage conditions and expiration dates; allow proper warm-up and stirring before use.
- curing degree inspection: introduce curing degree testing equipment (e.g., fourier transform infrared spectrometer) when necessary.
how to avoid these errors? partner with a professional dispensing equipment manufacturer.
as a trusted dispensing machine manufacturer, [xinghua intelligent
manufacturing] deeply understands the essence and challenges of
dispensing processes. we provide not just equipment, but stable,
efficient, and high-precision dispensing solutions:
- full range of high-precision dispensing platforms:
covering microelectronic precision dispensing to large-scale structural
adhesive coating, with core components from international top brands to
ensure exceptional performance and long-term stability.
- advanced vision & motion control:
integrated high-resolution ccd vision systems and high-rigidity motion
platforms achieve μm-level positioning accuracy, effectively resolving
misalignment issues.
- intelligent fluid control systems: equipped
with precision screw valves, piezoelectric jetting valves, etc.,
combined with intelligent pressure control and viscosity compensation
algorithms to ensure consistent glue output, significantly reducing
stringing and bubbles.
- mature process database & expert support:
rich industry application experience, offering end-to-end technical
support from equipment selection, parameter tuning to process
optimization, helping you quickly overcome dispensing challenges.
- reliable after-sales service: rapid-response localized service teams to ensure continuous and efficient equipment operation.
the perfection of dispensing lies in precise control of every detail.
avoiding these common errors not only significantly improves product
yield and production efficiency but also reduces overall costs and
enhances market competitiveness. partnering with a professional
dispensing equipment manufacturer is your optimal path to achieving
stable, reliable, and efficient dispensing production.
[shenzhen xinghua intelligent manufacturing technology co., ltd.] is
committed to becoming your most reliable intelligent manufacturing
partner. if you are facing dispensing process challenges or aiming to
enhance automation levels, please feel free to contact us. our technical
experts will provide free process assessments and customized solutions.
