Nsɛm a Wɔakyerɛkyerɛ mu
Wɔde fir nnua di dwuma kɛse wɔ funnaka a wɔyɛ mu esiane sɛ ɛyɛ den sɛnea ɛsɛ, wotumi yɛ ho adwuma yiye, na ɛyɛ adwuma yiye nti. Wɔakyerɛkyerɛ ne nsɛm atitiriw no mu kɔ akyiri sɛnea edidi so yi:
1. Nsusuwii a Ɛfa Nsusuwii Ho
Wɔayɛ nsusuwii ahorow no sɛnea funnaka akɛse a wɔahyɛ da ayɛ nanso ɛma kwan ma wɔyɛ no sɛnea wɔpɛ.
Ne kɛse: Mpɛn pii no efi 15mm kosi 40mm. Wɔde ntaaboo a ɛyɛ den (30mm–40mm) di dwuma ma funnaka no nhyehyɛe titiriw (sɛ nhwɛso no, afã horow, nkataso) de hwɛ hu sɛ adesoa-soa tumi, bere a wobetumi de nea ɛyɛ tratraa (15mm–25mm) ahyɛ afã horow a ɛto so abien (sɛ nhwɛso no, nnyinaso ntama).
Trɛw: Ntrɛwmu a wɔtaa yɛ no yɛ 120mm–300mm. Ntaaboo a ɛwɔ saa beae yi mu no brɛ hia a ehia sɛ wɔde nhama bom dodo no ase, na ɛma funnaka no mudi mu kura na ɛyɛ fɛ.
Ne tenten: Mpɛn pii no ɛyɛ 1800mm–2400mm, a ɛne mpanyimfo funnaka tenten a wɔahyɛ da ayɛ (180cm–220cm) hyia. Wobetumi ayɛ tenten tenten (ɛkɔ 3000mm) ama ahwehwɛde soronko.
2. Nsuo a Ɛwɔ Mu
Ɛho hia sɛ wɔsiw warping anaa mpaapaemu ano, wɔhwɛ nsuo a ɛwɔ mu no so yie wɔ 8%–12% ntam. Saa kwan yi ne ɔmantam no mu wim tebea dodow no ara hyia, na ɛhwɛ hu sɛ nnua no kɔ so gyina bere a wɔde sie, wɔde rekɔ, na wɔde di dwuma-a ɛkwati sɛ ɛbɛsakra a ebetumi asɛe funnaka no nhyehyɛe.
3. Adesua Nkyekyɛmu
Wɔde abasobɔde ahorow gyina sintɔ ahorow a ɛwɔ ɔfasu no so ne nnua no su so, na wɔde abasobɔde atitiriw abien ma wɔ funnaka a wɔde di dwuma ho:
Grade A: Nhama, mpaapaemu, anaa kɔla a ɛsakra a wotumi hu biara nni soro; aburow yɛ tẽẽ na ɛyɛ pɛ. Ɛfata ma funnaka a ɛkorɔn-awieɛ a ɛwɔ baabi a hwɛbea yɛ adeɛ a ɛdi kan.
Grade B: Ɛma kwan ma 1–2 nketewa, a ɛnyɛ-structural knots (diameter Les than or equal to 5mm) wɔ mita ahinanan biara mu ne aburow a ɛtwetwe kakra. Wɔde di dwuma ma mfinimfini-range funnaka, ɛkari pɛ ne sɛnea wɔde di dwuma.
4. Nsɛnkyerɛnne Titiriw Afoforo
Density: Bɛyɛ 400–500 kg/m3, ɛma kari pɛ pa wɔ mu duru a emu yɛ hare (ɛnyɛ den sɛ wobedi ho dwuma) ne structure ahoɔden.
Glue Type (ma spliced boards): Wɔde nneɛma a wɔde nkata nneɛma a atwa yɛn ho ahyia-adamfofa a ɛhyia E1 anaa E0 gyinapɛn (formaldehyde a wɔtow gu a ennu anaasɛ ɛne 1.5mg/L yɛ pɛ) di dwuma, na ɛhwɛ hu sɛ ahobammɔ wom na ɛmma hua nkɔ fam.
Fasuo Ayaresa: Wɔde anhwea gu ntaaboo dodoɔ no ara mu na ama wɔanya ɔfa a ɛyɛ torotoro (ɛyɛ mmerɛw a ɛnnu anaa ɛyɛ pɛ 6μm), na ɛma ɛyɛ mmerɛ sɛ wɔbɛyɛ mfonini anaa wɔde varnishing a ɛdi akyire (nneɛma a wɔtaa de wie no bi ne nkatasoɔ a emu da hɔ na ama dua no abɔdeɛ mu nwene akora so).
Di Yɛn Nkitahodi
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