I. Raw Material Description

This dedicated head fixing accessory for polygraph testing instruments consists of an integrated upper and lower cover band structure, serving as a supporting plastic component for medical testing equipment. The product is injection-molded as a single piece from composite plastic raw materials. Primarily designed to secure and support polygraph testing devices worn on the head, it conforms to the contour of the human scalp, holds the polygraph sensing components, and ensures stable wearing comfort as well as accurate test data. It is matched for use with professional polygraph testing equipment.

The core raw material of this product is a modified composite blend of TPE thermoplastic elastomer, P3850 plastic compound, and P3860 plastic compound. The three materials complement one another in performance, balancing structural strength, wearing flexibility, weather resistance, and medical safety requirements. Detailed material characteristics are outlined below:

1. TPE Thermoplastic ElastomerAs the flexible base material of the product, it forms the skin-contact core layer. Non-toxic and odor-free with skin-friendly eco-friendly properties, it complies with safety standards for civilian and medical wearable accessories. Its soft, smooth surface conforms naturally to the curved contours of the human head, eliminating compression and discomfort caused by rigid materials. It also boasts excellent fatigue resistance: repeated bending and long-term wear will not result in deformation, cracking, or aging, sustaining consistent comfort and stability over extended service life. Additionally, it exhibits good fluidity during injection molding, enabling molding of complex hollow structural forms.

2. P3850 Modified Plastic CompoundPrimarily responsible for structural support, it delivers foundational rigidity and impact resistance to the upper and lower cover housings. Featuring high purity and minimal impurities, molded parts achieve uniform wall thickness and precise dimensional accuracy. Its superior hardness and bending strength firmly secure internal sensing components, wiring harnesses, and fixed structures, preventing loosening or deformation during equipment setup and movement. It also delivers outstanding dimensional stability, resisting shrinkage and warping under temperature fluctuations to ensure precise fitting between the accessory and the main polygraph unit.

3. P3860 Functional Plastic CompoundProvides comprehensive performance reinforcement for the product, with key enhancements to abrasion resistance, anti-aging properties, insulation, and yellowing resistance. Molded surfaces have high gloss and strong scratch resistance, resisting powder shedding and abrasion from prolonged skin contact. Exceptional electrical insulation effectively isolates the polygraph’s circuitry from human contact, mitigating risks of electric leakage and signal interference. This safeguards stable equipment operation and precise data readouts, meeting the application requirements of electronic testing hardware.

II. Raw Material Performance Parameters

Formulated to comply with safety standards for medical wearable accessories, the product’s core performance parameters fully accommodate long-term, high-frequency professional polygraph testing scenarios:

• Mechanical Properties: Shore hardness 55–65A, balancing supportive rigidity and flexible softness; tensile strength ≥12MPa, elongation at break ≥350%; withstands over 1,000 repeated bends without cracking or deformation. Excellent compression resistance prevents indentation or shape distortion under everyday head-wearing loads, delivering robust structural stability.

• Safety & Environmental Compliance: Raw materials are non-toxic, odorless, and non-irritating, free of heavy metals and harmful volatile substances. Conforms to safety standards for wearable accessories, allowing direct contact with human scalp without allergic or irritating reactions during long-term wear.

• Environmental Resistance: Operating temperature range of -20°C to +60°C, maintaining stable performance in standard indoor and office testing environments. Outstanding anti-UV and anti-yellowing properties prevent discoloration and aging over long-term use. Dustproof and stain-resistant surfaces support easy cleaning and disinfection, suitable for high-frequency public testing environments.

• Electrical Insulation Properties: Insulation resistance ≥1000MΩ, delivering robust anti-electromagnetic interference performance. Effectively blocks external signal noise to avoid distortion of physiological data collected by the polygraph sensors, ensuring consistent, precise test results.

• Molding Compatibility: Stable molding shrinkage ≤0.5%, dimensional tolerance controlled within ±0.1mm. High fitting precision ensures seamless alignment with polygraph headbands and sensing assemblies, eliminating loosening or jamming issues.

III. Production Process

The entire product line adopts integrated precision injection molding, featuring standardized workflows and high manufacturing accuracy to guarantee uniform quality and consistent stability across mass production. The complete production sequence is as follows:

1. Raw Material Proportioning & MixingTPE, P3850, and P3860 raw materials are blended per custom formulations, then fed into a high-speed mixer for homogeneous agitation. This ensures uniform fusion of material components, eliminating localized performance inconsistencies and laying a foundation for subsequent molding.

2. Raw Material Drying & DehumidificationMixed raw materials are loaded into constant-temperature drying equipment to remove internal moisture. This prevents molding defects such as air bubbles, shrinkage cavities, and cracking in finished products, enhancing structural density and mechanical strength.

3. Precision Injection MoldingFully dried raw materials are fed into precision injection molding machines. Under high-temperature melting and high-pressure injection, molten plastic is injected into custom molds dedicated to this product. Constant temperature and pressure controlled molding yields an integrated upper and lower cover main body with crisp contours, uniform wall thickness, and precise dimensional accuracy.

4. Edge Trimming & PolishingManual and automated equipment work in tandem to remove burrs and flash from product edges. Fine polishing is performed on fitting and contact surfaces to create smooth, rounded edges that eliminate foreign-body sensation during wear, while preserving assembly fit precision.

5. Quality Inspection & TestingSequential inspections cover visual appearance, dimensional accuracy, flexibility testing, and random sampling for insulation performance. Defective products are screened out to ensure all finished goods meet full specification criteria for appearance and dimensional tolerances.

6. Clean Packaging & WarehousingQualified products undergo dust removal and sanitization before airtight sealed packaging to avoid dust contamination. Finished packaged units are transferred to storage, completing the full production workflow.

IV. Product Application Scenarios

This dedicated head fixing accessory for polygraph instruments is engineered specifically for professional psychological assessment, judicial investigation, compliance screening, and related use cases. Core application scenarios are detailed below:

1. Judicial Criminal Investigation ScenariosMatched with professional polygraph equipment deployed by public security and judicial authorities. During case investigations and evidence screening, it acts as a head-mounted fixing component to securely hold polygraph sensing probes and signal acquisition assemblies. It maintains stable equipment contact during testing to accurately collect human physiological data, providing hardware support for polygraph analysis and evaluation.

2. Professional Psychological Assessment ScenariosUsed in psychological counseling institutions, university mental health centers, and corporate talent evaluation programs. Paired with polygraph and emotional detection equipment, it fixes the testing device on the subject’s head to assist with emotional discrimination, credibility assessment, and psychological status screening.

3. Compliance Screening & Political Review ScenariosDeployed for enterprise and institutional pre-employment screening, position-based political reviews, and standardized compliance assessments. The lightweight, comfortable fit accommodates long-duration, high-frequency testing workflows, reducing subject discomfort and improving testing efficiency and data stability.

4. Scientific Research & Laboratory Testing ScenariosCompatible with human physiological signal collection and psychological behavioral research laboratory work. Its superior insulation and structural stability shield test data from external interference, ensuring accurate, repeatable experimental results.

Overall, this accessory combines skin-safe material properties, robust structural stability, and universal adaptability. It fully addresses the core demands of professional polygraph testing equipment for daily wear, long-duration use, and high-frequency operation, serving as an indispensable core matching plastic component for polygraph instruments.