Ihe mkpuchi ịgbado ọkụ, nke a makwaara dị ka ihe mkpuchi na -egbochi mkpọchi, bụ akwa polymer dị mkpa eji eme ya PCB mbadamba iji gbochie nkwonkwo ịkwa akwa na -eme Bridges. Ihe mkpuchi ịgbado ọkụ na -egbochi ịzere ikuku ma na -emetụta akara ọla kọpa na bọọdụ PCB.

What is PCB solder resistance type? The PCB welding mask acts as a protective coating on the copper trace line to prevent rust and prevent solder from forming Bridges that lead to short circuits. Enwere ụdị nkpuchi isi anọ nke PCB – mmiri epoxy, fotogramable mmiri, foto ịse foto, na nkpuchi elu na ala.

Ụdị mkpuchi mkpuchi anọ

Ihe mkpuchi ịgbado ọkụ na -adịgasị iche n’ichepụta na ihe. Kedu na nke nkpuchi mkpuchi ị ga -eji dabere na ngwa ahụ.

Ihe mkpuchi elu dị na elu na ala

Nkpuchi mkpuchi elu na nke ala Ndị injinịa elektrọnik na -ejikarị ya amata oghere dị na akwa mgbochi ihe mkpuchi akwụkwọ ndụ akwụkwọ ndụ. Ejiri epoxy resin ma ọ bụ teknụzụ ihe nkiri tinye ihe mkpuchi ahụ. A na -ejikọ atụdo akụrụngwa ahụ na bọọdụ site na iji oghere edebanyere aha ya na nkpuchi.

The conductive trace pattern on the top of the circuit board is called the top trace. Yiri ihe nkpuchi elu dị n’elu, a na -eji ihe mkpuchi ala nke ala n’akụkụ azụ nke bọọdụ sekit.

Ihe mkpuchi mkpuchi mmiri mmiri

Epoxy resins are the cheapest alternative to welding masks. Epoxy is a polymer that is screen printed on a PCB. Mbipụta ihuenyo bụ usoro mbipụta nke na -eji ụgbụ akwa iji kwado usoro igbochi ink. The grid allows identification of open areas for ink transfer. In the final step of the process, heat curing is used.

Ihe mkpuchi ihe mkpuchi ihe onyonyo Liquid

Ihe nkpuchi fotoconductive masks, nke a makwaara dị ka LPI, bụ ngwakọta nke mmiri abụọ dị iche iche. Liquid components are mixed prior to application to ensure a longer shelf life. It is also one of the more economical of the four different PCB solder resistance types.

Enwere ike iji LPI maka ibipụta ihuenyo, eserese ihuenyo ma ọ bụ ngwa ịgba. The mask is a mixture of different solvents and polymers. N’ihi nke a, enwere ike ị nweta mkpuchi mkpuchi dị gịrịgịrị nke na -arapara n’elu mpaghara ebumnuche. Emebere nkpuchi a maka ikpuchi ihu, mana PCB anaghị achọ ihe mkpuchi mkpuchi ikpeazụ a na -ahụkarị taa.

N’adịghị ka inks epoxy nke ochie, LPI na -enwe mmetụta maka ọkụ ultraviolet. Ekwesịrị iji nkpuchi kpuchie panel ahụ. Mgbe “okirikiri ọgwụgwọ” dị mkpirikpi, bọọdụ ahụ na -ekpughere ọkụ ultraviolet site na iji photolithography ma ọ bụ laser ultraviolet.

Before applying the mask, the panel should be cleaned and free of oxidization. Emere nke a site n’enyemaka ihe ngwọta kemịkalụ pụrụ iche. Enwere ike ime nke a site na iji ngwọta alumina ma ọ bụ site na iji pumice okwute kwụsịtụrụ.

One of the most common ways to expose panel surfaces to UV is by using contact printers and film tools. The top and bottom sheets of the film are printed with an emulsion to block the area to be welded. Use the tools on the printer to fix the production panel and film in place. The panels were then simultaneously exposed to an ULTRAVIOLET light source.

Usoro ọzọ na -eji lasers mepụta onyogho ozugbo. But in this technique, no film or tools are needed because the laser is controlled using a reference mark on the panel’s copper template.

Enwere ike ịhụ ihe mkpuchi LPI n’ụdị agba dị iche iche, gụnyere akwụkwọ ndụ akwụkwọ ndụ (matte ma ọ bụ ọkara-gloss), ọcha, acha anụnụ anụnụ, ọbara ọbara, odo, ojii, na ndị ọzọ. Ụlọ ọrụ LED na ngwa laser na ụlọ ọrụ eletrọnịkị na -agba ndị nrụpụta na ndị nrụpụta ume ka ha rụpụta ihe ọcha na nke ojii siri ike.

Ihe nkpuchi ihe nkiri na -ese foto nkpuchi mkpuchi

A dry film photoimagable welding mask is used, and vacuum lamination is used. A na -ekpughere ihe nkiri akọrọ wee mepụta ya. After the film is developed, openings are positioned to produce patterns. Mgbe nke a gasị, a na -etinye ihe mmewere ahụ na mpe mpe akwa brazing. A na -etinye ọla kọpa ahụ na bọọdụ sekit site na iji usoro electrochemical.

A na -etinye ọla kọpa n’ime oghere ahụ na mpaghara nchọta. E mechara jiri gbam gbam gbam gbam gbam. In the final step, the membrane is removed and the etching mark is exposed. Usoro a na -ejikwa ọgwụgwọ ọkụ.

Dry film welding masks are commonly used for high-density patch boards. N’ihi ya, ọ naghị awụnye n’ime oghere. These are some of the positives of using a dry film welding mask.

Ikpebi ihe nkpuchi ị ga -eji dabere na ihe dị iche iche – gụnyere nha PCB nkịtị, ngwa ikpeazụ a ga -eji, oghere, ihe ndị a ga -eji mee ya, ndị na -eduzi ya, nhazi elu ya, wdg.

Imirikiti atụmatụ PCB ọgbara ọhụrụ nwere ike nweta ihe nkiri na -eguzogide foto. Therefore, it is either LPI or dry film resistance film. The surface layout of the board will help you determine your final choice. If the surface topography is not uniform, the LPI mask is preferred. If a dry film is used on uneven terrain, gas may be trapped in the space formed between the film and the surface. Therefore, LPI is more suitable here.

Agbanyeghị, enwere ọghọm dị n’iji LPI. Its comprehensiveness is not uniform. You can also get different finishes on the mask layer, each with its own application. For example, in cases where solder reflow is used, the matte finish will reduce solder balls.

Build solder masks into your design

Iwulite ihe nkiri na -eguzogide solder n’ime imewe gị dị mkpa iji hụ na ngwa nkpuchi dị n’ogo kachasị mma. When designing a circuit board, the welding mask should have its own layer in the Gerber file. In general, it is recommended to use a 2mm border around the function in case the mask is not fully centered. Ịkwesịrị ịhapụ opekata mpe 8mm n’etiti mpe mpe akwa iji hụ na Bridges adịghị etolite.

Thickness of welding mask

Thickness Welding mask will depend on the thickness of the copper trace on the board. Na mkpokọta, a na -ahọrọ ihe mkpuchi ịgbado ọkụ 0.5mm ikpuchi ahịrị ndị a. If you are using liquid masks, you must have different thicknesses for different features. Mpaghara laminate efu nwere ike ịnwe ọkpụrụkpụ nke 0.8-1.2mm, ebe mpaghara nwere njiri mara dị ka ikpere ga-enwe mgbatị dị gịrịgịrị (ihe dị ka 0.3mm).

ọgwụgwụ

Na nchịkọta, imepụta mkpuchi mkpuchi nwere nnukwu mmetụta na arụmọrụ ngwa. Ọ na -arụ ọrụ dị oke mkpa iji gbochie àkwà mmiri na ịgbado ọkụ, nke nwere ike ibute obere sekit. Yabụ, mkpebi gị kwesịrị iburu n’uche ihe dị iche iche akpọtụrụ n’isiokwu a. Enwere olile anya na edemede a nwere ike inyere gị aka ịghọta nke ọma ụdị ihe nkiri na -eguzogide PCB. Ọ bụrụ na ị nwere ajụjụ ọ bụla, ma ọ bụ naanị ịchọrọ ịkpọtụrụ anyị, anyị na -enwe obi ụtọ mgbe niile inyere gị aka.