1. Tus cwj mem muaj zog thiab ruaj khov dua li cov cwj mem zoo tib yam, tab sis yog tias nws siv thiab khaws cia tsis raug, nws feem ntau tsis tuaj yeem sau cov lus. Qhov no feem ntau yog vim tias cov number case qhuav thiab cov khoom siv nyob ib ncig ntawm lub pob steel thiab tiv thaiv tus number case los ntawm ntws tawm. Ink yog ib hom roj viscous, uas yog npaj nrog linseed roj, hluavtaws ntoo txiv ntoo roj (tsuas yog muaj terpene alcohols), ntxhia roj (roj tau los ntawm fractionating roj av thiab lwm yam minerals), tawv kua nplaum thiab roj fume, thiab lwm yam.
2. Thaum siv cov cwj mem ballpoint, tsis txhob sau rau ntawm daim ntawv nrog roj lossis siv quav ciab, txwv tsis pub cov roj thiab cov quav ciab tau muab tso rau hauv lub tais tooj liab raws lub pob hlau, uas yuav cuam tshuam rau cov ntawv sau tus lej thiab ua rau nws tsis tuaj yeem sau. Tsis txhob cuam tshuam thiab raug tus cwj mem. Yuav tsum hnav lub kaus mom cwj mem nrog cov hnab looj tes tiv thaiv kev puas tsuaj rau lub taub hau cwj mem, qhov deformation ntawm tus cwj mem thiab cov roj to ntawm tus cwj mem core thiab paug lub cev. Thaum huab cua txias los yog tsis siv rau lub sijhawm ntev. Thaum tus cwj mem tsis oily, koj tuaj yeem tsau tus cwj mem hauv dej sov ib pliag thiab tom qab ntawd los so tus cwj mem ntawm daim ntawv los sau.
3. Tus cwj mem ballpoint muaj qhov tsis zoo: qhov kev sau ntawv nws sau tau meej heev thaum xub thawj; tab sis nws tsis tuaj yeem sawv qhov kev sim ntawm lub sijhawm. Sij hawm dhau mus, kev sau ntawv yuav maj mam plam. Qhov no yog vim tus cwj mem rau cov cwj mem ballpoint yog ua los ntawm cov xim thiab cov roj castor. Roj tsis zoo ib yam li dej. Nws tsis yooj yim kom qhuav. Sij hawm dhau mus, cov roj yuav maj mam ntws tawm ntawm daim ntawv, thiab kev sau ntawv yuav plam. Yog li ntawd, tus cwj mem ballpoint tsuas yog siv los ua tus cwj mem sau ntawv xwb. Yog tias koj xav khaws koj cov ntawv sau rau ntev, ces koj yuav tsum siv tus cwj mem.
4. The ball-point pen is on the ground. If the tip of the pen touches the ground at 90 degrees, the tip of the ball-point pen will not be damaged. However, if the end of the pen is bumped, the phenomenon of "oil leaking" will occur at the gap. In severe cases, the ball will fall off and appear. Difficulty writing, etc.
