Osisi ndị dị n'otu akụkụ
Ogwe osisi na-agbakọta ọnụ (PSL) bụ ụdị osisi a rụrụ arụ nke e ji eriri osisi na-agagharị agagharị jikọta ya na ihe na-arapara n'ahụ mee.  A na-eji ya eme ihe maka ogwe osisi, isi, ogidi, na post, n'etiti ihe ndị ọzọ. Akara ndị dị na PSL bụ ihe ndị a na-egbutu egbutu nwere akụkụ dị ala nke na-agaghị agafe ⁄ inch (6.4 ) na nkezi ogologo nke ọ dịkarịa ala okpukpu 300 nke obere akụkụ a (ihe dị ka 6 ft ma ọ bụ 1.8 m). Ọ bụ onye otu nke ezinụlọ nke osisi (SCL) nke ngwaahịa osisi.

Ike imewe nke PSL dị ukwuu karịa nke osisi a pịrị apị ka a na-agbakọta eriri ndị ahụ n'otu ụzọ na n'okpuru nrụgide dị elu. Nke a na-eme ka ihe dị arọ ma sie ike karị. N'ihi na eriri na ezughị oke ndị ọzọ na-agbasa na mberede n'ime ngwaahịa ahụ (ma jupụta ma sie ike na mgbaaka) ike dị iche iche site n'otu akụkụ nke PSL gaa na nke ọzọ bụ ihe na-erughị na osisi siri ike. Ebe ọ bụ na a na-ejikarị ihe owuwu osisi eme ihe na pasentị ise kachasị ala nke usoro ike nke ihe ahụ, PSL nwere uru dị elu maka ịgbagọ, mgbagwoju anya na ọka, na mkpakọ na ọka.

Ihe e mepụtara, mmepe, ahịa na ikike ikike nke PSL, na-eji osisi osisi, na-amalite tupu Parallam, laghachi na CSIRO's Division of Chemical and Wood Technology na 1976 na, kemgbe Septemba 1977, Repco Ltd, na enyemaka ya Repco Research Pty Ltd, na ndụmọdụ CSIRO.

A maara ngwaahịa ahụ site na aha Scrimber, a kọwakwara ya na vidiyo 1980 nke CSIRO mepụtara n'oge mmepe na Repco Research Pty Ltd., na akwụkwọ CSIRO bipụtara na 1986  Scrimber: A New Engineering Wood Product. E mechara nyefee ikikere teknụzụ ahụ na Scrimber International nke e guzobere ọhụrụ n'oge ahụ na 1985 - Scrimber Internationale bụ njikọ aka n'etiti SA Timber Corporation na SA State Government Insurance Commission.

O yikarịrị ka ngwaahịa Parallam, nke na-eji ihe ndị a kpụrụ akpụ n'otu akụkụ kama ịpịcha n'ahịrị iji mepụta usoro eriri ndị dị n'otu, e mepụtara ya site na teknụzụ e nyere ikike site na CSIRO ma jiri ya mee ihe n'ụzọ azụmahịa site na Scrimber International dị ka e kwuru na Popular Mechanics May 1990 isiokwu peeji nke 96-99. Akụkọ ihe mere eme nke Scrimber patents chọtara na Google Patents (European), dabeere na Australian Patent Priority nke a na-azọrọ site na AUPG251683, wee gwụ na 2004,

Parallam bụ aha akara maka ngwaahịa nke MacMillan Bloedel (nke bụ Weyerhaeuser ugbu a) mepụtara, mepụtara, zụọ ahịa ma nye ya ikike.  Ọ bụ naanị ngwaahịa osisi a na-emepụta ma na-ere ahịa n'ụwa. [citation needed] Enwere ike iji ụdị osisi ọ bụla mee PSL, mana Douglas fir, southern pine, western hemlock, na yellow poplar na-ahọrọkarị n'ihi ike ha dị elu.

A na-emepụta ngwaahịa ahụ dị ka 12-by-12-inch (300   ) ma ọ bụ 12-by-18-inch (300 ×  mm) tiketi na akụkụ nwere akụkụ anọ, nke a na-akpụkarị ma belata ya ka ọ bụrụ obere akụkụ. A na-anọgide na-emepụta ogwe osisi ahụ, yabụ ogologo nke ogwe osisi a na-ejedebe naanị na ogologo kachasị elu nke enwere ike ijikwa ma buru.  Obosara ndị a na-ahụkarị bụ 3+1⁄, 5+1⁄4 ma ọ bụ   (89, 133  178 mm); omimi ndị a na'ahụkarị bụ 9+1⁄ 2, 11+7⁄8, , 16 na 18 sentimita (240, , ,  ). A na-eekarị ogwe osisi ahụ ruo ogologo nke 60 feet (18 m).

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