ما هي مادة ثنائي الفينيل متعدد الكلور؟

تصنيف ثنائي الفينيل متعدد الكلور

هناك ثلاثة أنواع رئيسية من لوحة PCB:

لوحات لوحة واحدة

Single-sided boards are on the most basic ثنائي الفينيل متعدد الكلور. The parts are concentrated on one side, and the wires are concentrated on the other side (when there are chip components and the wire are on the same side, the plug-in device is on the other side). Because the wires only appear on one side, this PCB is called a single-sided (Single-sided). Because the single panel has many strict restrictions on the design of the circuit (because there is only one side, the wiring between can not cross and must be around a separate path), so only early circuits use this type of board.

Double panel board

The double-sided circuit board has wiring on both sides, but to use the wires on both sides. It is necessary to have an appropriate circuit connection between the two sides. This “bridge” between circuits is called a via. The via hole is a small hole filled or coated with metal on the PCB, which can be connected to the wires on both sides. Because the area of the double-sided board is twice as large as that of the single-sided board, the double-sided board solves the difficulty of interleaving wiring in the single-sided board (it can be connected to the other side through the hole), and it is more suitable for use in more complicated circuits than the single-sided board.

Multilayer boards

In order to increase the wiring area of ​​the multilayer board, the multilayer board uses more single or double-sided wiring boards. A printed circuit board with one double-sided as inner layer, two single-sided as outer layers or two double-sided as inner layers and two single-sided as outer layers. Printed circuit boards that are interconnected by positioning systems and insulating adhesive materials and whose conductive patterns are interconnected according to design requirements become four-layer and six-layer printed circuit boards, also known as multilayer printed circuit boards. The number of layers of the board does not mean that there are several independent wiring layers.

In special cases, an empty layer will be added to control the thickness of the board. Usually, the number of layers is even, and it includes the two outermost layers. Most of the motherboards are 4 to 8-layer structure, but technically, the theory can achieve nearly 100-layer PCB board. Most large-scale supercomputers use quite multiple layers of motherboards, but because such computers can be replaced by clusters of many ordinary computers, ultra-multilayer boards have gradually been discontinued. Because the various layers in the PCB are tightly combined, it is generally not easy to see the actual number, but if you look closely at the motherboard, you can still see it.

 

مادة ثنائي الفينيل متعدد الكلور

In terms of materials, PCB material can be divided into organic materials and inorganic materials:

• Organic materials: Phenolic resin, glass fiber/epoxy resin, polyimide, BT/Epoxy, etc. all belong to it.
• Inorganic material: Aluminum, copper-invar-copper, ceramic, etc. belong to it.

The choice of PCB sheet must strike a balance between meeting design requirements and mass production and cost. Design requirements include electrical and institutional components. This material problem is usually more important when designing very high-speed PCB boards (frequency greater than GHz).

PCB material type:

94HB: ordinary cardboard, not fireproof (the lowest grade material, die punching, can not be a power board);94V0: flame retardant cardboard (die punching);
22F: single-sided half-glass fiber board (die punching);
CEM-1: single-sided glass fiber board (must be computer drilled, not die punching);
CEM-3: double-sided half-glass fiber board (except for double-sided cardboard, which belongs to the lowest end of the double-sided board, simple double-sided board can use this material);
FR-4: double-sided glass fiber board;

The classification of flame retardant properties can be divided into 94V-0/V-1/V-2, 94-HB four.

94V-0 و 94V-2 تنتمي إلى فئة من المواد المقاومة للهب. ومن بين هذين النوعين ، ينتمي 94V-0 إلى أعلى مادة مقاومة للهب. تنقسم لوحة PCB بشكل عام إلى عدة ألوان ، والأخضر هو الأكثر شيوعًا والأسود والأحمر والأزرق والأصفر. اللون والجودة غير مرتبطين ، فقط أداء مخصص

مزايا ثنائي الفينيل متعدد الكلور

بعد أن تتبنى المعدات الإلكترونية اللوحة المطبوعة ، نظرًا لاتساق اللوحات المطبوعة المماثلة ، يتم تجنب خطأ الأسلاك اليدوية. ويمكن أن تحقق الإدراج التلقائي أو التنسيب للمكونات الإلكترونية ، واللحام التلقائي ، والكشف التلقائي. ضمان جودة المعدات الإلكترونية وتحسين إنتاجية العمالة وخفض التكاليف وتسهيل الصيانة.

السبب في أن ثنائي الفينيل متعدد الكلور يمكن استخدامه على نطاق واسع ، لأنه يحتوي على العديد من المزايا الفريدة ، فإن الخطوط العريضة هي كما يلي.

عالية الكثافة: لعقود من الزمان ، يمكن أن تتطور الكثافة العالية للألواح المطبوعة مع تحسين تكامل الدوائر المتكاملة وتقدم تقنية التركيب.

موثوقية عالية: من خلال سلسلة من عمليات الفحص والاختبارات واختبارات الشيخوخة ، يمكن ضمان عمل ثنائي الفينيل متعدد الكلور بشكل موثوق به لفترة طويلة (فترة الاستخدام ، بشكل عام 20 عامًا).

قابلية التصميم: ، مع وقت قصير وكفاءة عالية.

قابلية التصنيع: من خلال الإدارة الحديثة ، يمكن إجراء التقييس والمقياس (الكمية) والأتمتة وغيرها من الإنتاج لضمان اتساق جودة المنتج.

Testability: Established a relatively complete test method, test standards, various test equipment and instruments, etc. to test and identify the qualification and service life of PCB products.

Assemblability: PCB products are not only convenient for standardized assembly of various components, but also can be automated and large-scale mass production. At the same time, PCB and various component assembly parts can also be assembled to form larger parts and systems to the whole machine.

Maintainability: Because PCB products and various component assembly parts are standardized design and mass production, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored to work. Of course, there are more examples. Such as miniaturizing and lightening the system, and speeding up signal transmission.

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