Báo cáo khoa học công nghệ nghiên cứu khả năng sản xuất bột giấy từ cây luồng

KHOA HQC CdNG NGHfi
IVGHIEIM C U U K H A IXIAIXIG SAIXI X U A T B O T G l A Y T U C A Y
LUOIXIG {Dedra

calamus

baratus

H s u c t i e t D . Z . Li)
Cao Qudc An*

T6MTAT
Luong thuoc hp phu tre triic, bp h6a thao, dupe trong rat pho bidn a cac tinh nhir Thanh Hoa, Hoa Bmh,
Nghd An, Ha Tmh,... Tir trudc ddn nay, cSy ludng chu ydu dupe dimg lam nguydn li^u dan lat san xuat van
nhan tao, hay dung trong kidn truc,...cung da co nhimg nha may san xudt gily sti dung thSn cdy ludng d^
lam nguyen lidu san xuat bpt tuy nhidn, nhiing nghien cuu ca ban ve dac didm td thanh boa hpc, hay ky
thuat san xuat bpt giay sun phat tir than cay luong thi rat it dupe cong bd. Nguydn li#u dupe sti dtJUig trong
nghidn cuu la cay ludng 3 tudi, khai thac tai huydn Luong Son, tinh Hoa Binh. Thuc nghidm dupetidnhanh
tai Trung tam thi nghidm Khoa Che bien Lam san, Trudng D^ hpc Lam nghi$p. Kdt qua xac djnh thanh
phan boa hpc ciia nguyen lidu cay luong cho thly: Kich thuoc chidu dai spi 2,29 mm, chidu rpng spi 0,016
mm, dp th6 ciia spi la 143, ham lupng tro 1,08%, ham lupng chdt tan trong nuoc nong 8,10%, ham lupng ch^t
tan trong nuoc lanh 3,59%, ham lupng chat chidt sudt trong NaOH 1% la 17,65%, ham lupng xenluloza
48,77%, ham lupng linhin 24,74%, dp pH cua nguyen li^u 5,65. Kdt qua nghidn ctiu cho thdy, khi ndu bdt
giay sun phat tir nguydn li$u cay luong Hoa Binh nhi$t dp ndu thich hpp la 160^C, thdi gian bao dn 90 phtit
va lupng hda chat sir dung la 18%.
Tukhda: Bdt giay sun phat, cay luong Hda Binh, do tringcua bdt, hi$u suatbdtgiay.
LDATVANOE

Hidn nay, cdc nhd khoa hpc da xdc djnh dupe tre
tnic cd hon 70 hp va 120 loai khac nhau, vdi tdng
didn tich khoang 16 tridufadeta, dupe phdn bd a d c

khu vuc nhidt ddi vd d nhidt ddi, chi cd mdt sd it lodi
tre tnic dupe phdn bd a d c vimg dn ddi. O Vidt Nam,
do didu kidn dat dai thich hpp, ndn nhiing d y trdng
thudc hp tre tnic thirdng phdt tridn rIt nhanh. Ludng
la mdt trong sd nhiing lodi cdy dupe trdng khd phd
bien d cdc tinh: Thanh Hod, Nghd An, Ha Tmh, Hod
Binh... day la loai cay dd trdng, dd chdm sdc, trdng
mdt lan cd the thu hoach tir 40 - 50 nam, vi vdy, nhidu
ddn tpc d midn mii chpn cay ludng lam cdy phdt tiidn
kinh td gia dinh, cay xod ddi gidm nghdo.
Trong didu kidn ngudn nguyen Udu gd sii dung
cho cdc ngdnh chd bidn lam san vd cdng nghidp sdn
xult gily hidn nay cua Vi^t Nam ngdy d n g kham
hidm, vipc tap tnmg nghidn cthi nfaiing loai nguydn
Udu ngodi gd pfauc vti cfao d c ngdnh cdng nghidp
chd bidn, ddc bidt Id cdng nghidp san xult gily vd bdt
giay. Nghidn cihi sir dting ludng Hda Binh dd san
xuat bdt gily sun phat la mpt hudng di dung din,
mdt mat, gdp phin ndng cao hidu qua sir dting ddi
vdi lodi nguydn Udu nay, mdt khac, timg bude ndng

Trudng D^ii hpc Lam nghifp

84

cao thu nhdp cho ngudi ndng ddn, gdp phin xda doi
giam ngheo.
L NGUYEN LEU VA PHUUniG P H A P NGHDU CUU

1. Nguydn Udu

Nguydn U^u trong nghidn cthi la ludng 3 tudi,
dupe lly tai huy^n Luong Son, tinh Hda Binh. Thdn
d y luong dupe d t khiic vd bdm tfaanfa ddm nho,
cfaidu ddi dam kfaoang 2,0 cm, dam sau dd dupe sly
kfad ddn dp Im kfaoang 10%. Mdt pliln dam nguydn
Udu dupe nghidn nhd tiidnfa bdt, bdt sau khi nghidn
dupe di qua mit sang 40 60, phin fapp quy dch
dupe cho vdo binh kin dd cdn bdng am, sau dd su
dung cho vide xdc dinh td tiianh hdafapecua nguydn
Udu. Phin ddm nguydn Udu cdn lai dupe bpc kin
chuan bj cho qud trinh nlu bdt giay.
2. Pfauong pfadp nghien cthi
Phuong pfadp ly Ifauydfc Dung dd xdc djnh cic
kfaoang bien tfaien vd nfaidt dd nlu, tfadi gian bao dn
vd lupngfadacfalt sii diing trong qud trinfa nlu bpt
Phirong p h ^ tfairc ngfai^m: Dimg dd xdc dinh
thdnh phin hda hpc cung nfau xic djnh d c tinh chit
ciia bdt gily ttr nguydn Udu d y luong, d c tidu chuIn
chii ydu dugc sir dtmg or cdc tfai ngfaidm Id: T-150S58,T-210-OS-70, GB/T2677.6-1994, GB/T2677.81994T, GB/T747-1989. Bpt gily dupe nlu bing
phuong p h ^ Sim pfalt, vdi 3 bidn sd tfaay ddi Id nhi^t dO
nlu, tfadi gian bao dn vd lupng hda chit sir dung.

NONG NGHlfP VA PHAT TRIEN N 6 N G T H 6 N - K t 1 THANG 8/2011


KHOA HQC CdNG NGHfi
•.KET QUA V A T H A O LUAN

Kichtiiudccfaidu ddi, cfaidu rdng, dd tfad d a spi
nguydn Udu va so sdnfa vdi mdt sd lodi nguydn Udu

tre tnic kfadc dupe trinfa bdy trong bdng 1.

1. Hinh thdi spi d a ludng Hda Binh

TT

Loai nguydn Udu

Xult xtr

1
2
3
4
5
6
7
8
9
10
11
12

Ludng
Ludng
Tnicsdo
Ludng
Ludng
Tre tir
Luc Tnic

Tnic Dai
Tregai
Tremor
Buong
Giang

HdaBinfa
Thanh Hod
Trung Qudc
An Do
Trung Qudc
Trung Qudc
Trung Qudc
My
My
My
My
My

(Ngudn tii Udu tham khio [1], [21)
Tir sd Udu trong bdng 1 cho thly, chidu ddi trung
binh cua spi ludng Hda Binh Id 2,29 mm, ty Id giua
chidu dai vd chidu rdng cua spi Id 143. Ndu cdn cti
tiieo phdn d p chidu ddi spi nguydn Udutiitrcvdt ciia
lAWA (International Association of Wood Anatomists
- Hidp Hdi giai phau gd qudc td), cd tiid tiily spi
nguydn Udu ludng dupe xdp vdo loai cd chidu ddi ldn.
Ndu so sdnh vdi tidu chuIn spi nguydn lidu dimg
tiong san xult gily va bdt gily, tiii ddy dupe coi Id
loai spi tdt vd hodnti)dncd tiid ddp ling dupe nhihig

ydu d u diingti-ongsdn xult gily vd bdt gily.
2. Thdnh phinfadafaped a ludng Hda Binfa
Kdt qua so sdnh tiidnh phin hda hpc co ban cua
ludng Hda Binh vdi mdt sd lodi nguydn Udu kfadc
dupetiinhbdy trong bang 2.
Tir cdc sd lidu trong bang 2 cho tiily, hdm lupng
chit tan ti-ong NaOH 1% ciia ludng Hda Binh vin
tiilp hon mdt sd loditi-etinickhdc, tiilp hon 55,15%
so vdi ti-e gai vd cfai cao hon 0,57% so vdi ludng
Thanh Hda vd ti-e sdo. Hdm lupng chit tan ti-ong
NaOH 1% ciia ludng nho hon mdt sd nguydn U^u
cimg lodi ddc bidt Id tre gai vd ludng d a Trung Qudc.
Do dd, cd tild kfaing djnfa rdng cimg hp tre, nhung
didu kidn ldp dja khdc nhau tiii d c cfai sd ndy ciing
khdc nhau. Hdm lupng chit tan ti-ong NaOH 1%, or
mdt mtic dd ndo dd, phan dnh mtie dp bidn chit ciia
nguydn U§u. Ndu nguydn Udu bj mpc d n g nhidu,
ham lupng chit tan ti-ong NaOH 1% sd cdng cao.
N6NG

Dd dai spi,
mm
2,29
2,34
2,00
2,70
1,89
1,99
1,94
1,73

1,95
2,33
1,80
2,78

Dd rdng spi,
pm
16,15
16,21
16,20
14,00
11,00
15,00
14,70
.

Tyld
ddi/rdng
143
148 .
125 .
190
180
135
132
-

.
-

-

Didu ndy hodn todn kfadng cd lpi cho qud trinh san
xult bdt gily.
Cung tir bang sd Udu trdn cfao tfaly, hdm lupng
linhin ciia ludng Hda Binh or miic trung binh so vdi
cdc lodi tre khdc, tiilp hon 8,03% so vdi tre mfir vd cao
ban 17,54% so vdi tre gai. Trong cdng nghidp sdn
xult bdt gily, hdm lupng Unhui nhidu hay it sd dnh
hudng ddn hidu suit vd tinh chit cua bOt gily. Hdm
lupng Unfain cdng it tfai dng cd lpi cfao qud trinh nlu
bOt
Hdm lupng xenluloza d a ludng Hda Binh l^i
tuong ddi cao (48,77%) do vdy, ddy Id lodi nguydn Udu
hodn b)dn cd thd d ^ ting dupe d c ydu clu cho
nguydn Udu sdn bdt gily.
3. Nghidn cthi sdn xult bdt gily sun phdt tir
nguydn Udu cdy ludng Hda Binh
Trong pfadn tiii nghidm ndy, datidnhdnh nghidn
cthi anh hudng ddng tiidi cua 3 ydu td, la: Nhi^t dd
nlu cao nhlt (D, tiidi gian bao dn (x) va lupng hda
cfalt su dt^g (r|) vdi d c bidn cfaay nfau sau:
T=140PC,160»C,180PC.
T - 60 pfatit, 90 pfaiit, 120 pfaiit
TI = 16%, 18%, 20% (so vdi nguydn Udu kfad hiydt
ddi).
Kdt qud xdc djnfa hidu suit, tii sd Kappa vd dd
ti-Ing ctia bdt sau khi nlu vdi 2 lln ldp dupetiinhbdy
ti-ong bang 3,4 vd 5.

NGHlfP VA PHAT TRIEN N 6 N G THON - KY 1 THANG 8/2011

85


KHOA HQC CdNG NGHfi

TT
1
2
3
4
5
6
7
8
9
10
11

Bliig2. So sdnh hdm hipngtfadnh phin hod hpc d a hidng vdi m $ t s 6 lodi nguydn lifu khdc [3] | |
Hdm lupng chdt chidt xult, %
Hdm
Loai
Linhin, Xenluloza,
Trong
Trong
lupng tro,
Xudt sti
Trong nuoc

nguydn
%
%
nude lanh
NaOH 1%
%
lidu
ndng
17,65
24,74
3.59
48,77
8,10
1,08
Hda Binh
Luong
17,55
2,96
24,68
45.41
8,13
1,60
Thanh Hoa
Ludng
17,55
26,38
45.94
2,31
Phiic Kidn Tnic sao
Trung Qudc

28,14
22,88
49,96
2,90
Quang TSyTre
Trung Qudc
36,28
21,95
51,59
Tridt GiangLudng
1,79
Tnmg Qudc
39,35
4,30
20,40
46,40
Tregai
My
4,80
Tre mdr
5,10
27,90
26,90
44,40
My
2,40
4,59
19,35
30,09
5,25

My
37,94
3,26
Trucd?i
4,40
28,30
24,20
44,10
Buong
My
5,30
4,20
5.93
My
15,00
32,20
49,30
Tdm vdng
2,10
6,48
3,26
My
18,97
24,13
47,00
1,87
Giang
Bang 3. Hidu su& d a bot gilytijrcdy ludng Hda Binh, %
T
TT

T
X,
X,
Tl
16
60
53,18
160
53,17
1
16
90
50,36
160
50,37
2
16
120
45,22
160
45,21
3
60
140
72,23
4
18
72,24
18
61,37

140
61,37
90
5
18
53,43
120
140
53,45
6
7
18
48,21
60
160
48,22
8
18
47,44
90
160
47,43
9
18
43,26
120
160
43,28
38,17
10

18
60
180
38,15
35,44
11
18
90
180
35,41
12
18
31,21
120
180
31,23
46.40
13
60
160
20
46,41
42,22
90
160
14
20
42,23
41,55
15

20
120
160
41,57

Tir d c sd U^u tfai ngfaidm cfao tiily, due ydu td
nfaidt dp nlu, tfadi gian bao dn vd lirpngfadachit su
dting ddu cd anh faudng trtrc tidp tdi faidu suit ciia
bdt gily sau kfai nlu. Neu nfaidt dd nlu tdng cao, faidu
suit ciia bdt gily giam xudng, bdi vi, nfaidt dd cao
lam cfao tdc dp pfadn ting giiia hda cfalt vd cdc tfaanfa
pfain trong gd xly ra rIt nfaanfa, kfadng nfaiing Unfain
nhanh chdng bi hda tan, ma cdn lam cfao mdt bd
phdn xenluloza ciing bj hda tan, do dd, hidu suit bpt
giam xudng. Thdi gian bao dn tdng cung ldm cho
hi$u suit bdt gily din din giam xudng. Ndu tfadi
gian bao dn dng keo dai tfai hi$u suit ciia bpt sd tidp
tiic giam, bdi vi, tfadi gian dai sd ldm cfao sd lupng cdc
phdn ung giiia hda cfalt nlu va spi go xdy ra nfaidu,
lupng cdc bonfaydratbj phdn giai ciing theo do md
tdng ldn, ldm cho hidu suit bpt giam xudng.
86

N6NG

1 1

Cdc sd Udu thi nghidm a bang 4 cung cho tiily,
tri so Kappa cua b^t gily chju InhfaudngrIt ldn tir
d c tfadng sd cdng ngfad nlu bdt Kfai nfaidt dO nlu

tdng, tri sd Kappa d a bpt giam xudng, bdi vi, khi
nhidt dp tdng cao, ddm gd mdmfadanfaanfa, d c phan
ting tdch Unfain xdy ra nfaanfafaon,ndn lupng linhin bj
hda tan ciing tdng ldn, ldm cho trj sd Kappa nhanh
chdng giam xudng. Kfai tfadi gian bao dn hay lupng
fada cfalt sir dting tdng ldn, ddu lam cfao lupng Unhin
bjfadatan tdng ldn vd tii sd KaRW ciia b^t giam tii^.
Tuy nhidn, ndu nfaidt dp nlu, tfadi gian bao dn hay
lupng fada chit sir dting tdng ldn qui cao, chting sd
lam cfao d c bon hydrat bj phdn hiiy rIt nhanh, tir dd,
ldm cho fai^u suit b^t gidm xudng vd cudng dO ctia
bpt gily cung bj dnh hudng.

NGHIEP VA PHAT TRIEN

N 6 N G THON

- KY 1 - THANG 8/2011


KHOA HQC CbNG NGHfi
B4ng4.TrisdKappadab0tgilytucayhidng
i,br,
Hda Bmh

"If

TT
1
2

3
4
5
6
7
8
9
10
11
12
13
14
15

T
160
160
160
140
140
140
160
160
160
180
180
180
160
160
160

T

n

60
90
120
60
90
120
60
90
120
60
90
120
60
90
120

16
16
16
18
18
18
18
18
18

18
18
18
20
20
20

Y,
18,88
19.22
17,18
33,54
28,87
23,57
18,23
18,81
16,27
14,34
14,23
12,77
17,41
17,35
15,45

Y,

2

18,86
19,24

17,20
33,50
28,90
23,58
18,24
18,82
16,26
14,32
14,24
12,78
17,42
17,34
15,43

Bdng 5. DO tiding
d a bot gily tir c ^ ludng
H6a Binh
TT
1
2
3
4
5
6
7
8
9
10
11
12

13
14
15

T
160
160
160
140
140
140
160
160
160
180
180
180
160
160
160

T

n

z,

z.

60

90
120
60
90
120
60
90
120
60
90
120
60
90
120

16
16
16
18
18
18
18
18
18
18
18
18
20
20
20

24,3
25,3
26,7
18,6
20,2
21,9
25,5
25,9
27.7
29.2
30.3
36.8
26,6
26,8
28,5

24.4
25.3
26.9
18.3
20.5
21,7
25,6
25.8
27.8
29,3
30,5
36,9
26,2

26,4
28,6

Tir cdc sd Udu tiitic ngfaidm, tiidng qua xir ly
Dd tiiudn tidn cfao qud tiinfa didu kfaidn cdc
tiidng kd ti)an hpc cho ham sd 3 bidn, da tiiu dupe tiidng sd cdng nghd ti-ong qud tiinfa sdn xult, ndn
dc phuang trinh tuong quan sau:
khdng chd cdc tii sd c6ng nghd tiiich hpp Id: Nhidt
X = 709,61 - 1646,9T + 3160,47^ - 1307,7T + 705011dd T = 160''C, thdi gian bao 6n x = 90 phtit, lupng hda
- 255T2 - 37,13TI + l,47riT+ 186,9nT
(1) chit sii dtmg r\ = 18%.
4. Khdo ngfaiOm nlu bOttiieocdc gid trj nfaidt dO,
Y = 286,12 - 892,8T + 5148^= - 513,75T + 5034TT tiidi
gian vd hipng hda cfalt sii dyng tdi tiu
2821,5x2 - 10,18TI - 1,52TIT- 17,7TIX
(2)
Tidnfadnhkfalo nghidm sdn xult bdt gily sun
Z = 394,25 + 718T - 24(fP + 532,5x + 2550Tx +
phit
vdi d c didu kidn cdng ngh$ tdi uu vira tim dupe:
2625x2 + 10,2T| - 0,4TIT - 18TIX
(3)
Nhidt do cao nhlt khi nlu: T - 160»C;
Giaifad3 phuang tiinh (1), (2) vd (3) tiieo cdc
Thdi gian bio dn: x = 90 phtit;
didu kidn X -• max, Y —> mm vd Z —» max ta suy ra
dupe d cti-jsd T = 158,5, x = 88,9 vd t) = 17,8.
Lupng hda cfalt sir dting: X] * 18%.
Nhu vdy, tri sd cdng nghd nlu bdt tdi im tir
Bdt sau kfai nlu dupetidnhdnh kidm tra d c tinh

nguydn Udutiidncdy ludng Hda Binfa Id: Nfaidt dd T = cfalt nhu: dO tring, tri sd Kappa, chi sd cudng d$
158,5''C,tiidigian bdo dn x = 88,9 pfaut vd lupng fada chju xd, chi sd ctrdng dd cfaju kdo,... kdt qud dupe
chltsudt^gTi = 17,8%.
trinh bdy trong bdng 6.
Bdng 6. Kdt qui kidm tra tinh cfalt ciia bQt sau khi nlu
Chi sd (Judex)
Kdt qud
Tri so Kappa d a bpt chua tly trIng (Kappa of Unbleached pulp)
18,81
DO trdng ciia bpt chua tly trIng (Brightness of Unbleached pulp, %ISO)
25,90
Do nhdt ciia bdt chira tly trIng (Viscosity of Unbleached pulp, ml.g'O
1343,22
0,45
Mat do (Tightness, g/cm^
18,35
Chi sd cudng dO chju xd (Tear index, mN.m^.g'^)
3,29
Chi sd cudng dd chiu biic (Bursting index, kPa.m^.g'O
58,26
Chi sd do bdn chju kdo (Tensile index, N.m.g'O
Tir bdng sd Udu cho tiily. tii sd Kappa ciia bOt ^^ ^^ju xd Id 18,35 mN.mlg'S chi sd cudng dO chju
chua tly ti-Ing Id 18,81, dO ti-Ing ctia bOt chua tly ^yc Id 3.29 kPa.mV vd chi sd dO bdn cfaju kdo Id
tring Id 25,90 % ISO, dO nhdt d a bOt chua t^y tring ^8,26 N.m.g'* Cdc til sd ndyfaodnb)ln pfaii hpp vdi
id 1343,22 mlg-', mdt dO Id 0,45 g/cm^ cfai sd cudng y^" ^lu ciia bOt gily dimgti-ongsdn xult d c lo?i

NdNG NGHIEP VA PHAT TRI^N N 6 N G

THON

- KY 1 THANG 8/2011

87


KHOA HQC C 6 N G NGHfi
gily in bao vd gily vdn pfadng pfalm tfadng dting dupe
quy djnfa trong tidu cfauin GB 2677.4-81. Vi vdy, d
tfad kdt ludn ring, vdi nguydn Udu ludng Hda Binfa tfai
didu kidn cdng nghd n l u thicfa hpp n h l t Id nhidt dO T
= 160"C, tiidi gian bao dn x = 90 phut vd lupng hda
cfalt sir dting TI = 18%.
IV. KET LUAN

1. Kich tiiude chidu ddi spi tnmg binh d a ludng
Hda Bmh Id 2293,15 pm dupe xdp vdo d p spi dai, ty
Id chidu ddi spi/chidu rdng Id 143 ciing dupe xdp vdo
dang spi cd dO thon tdt, ddy Id mOt trong nhiing uu
didm Ai lua chpn nguydn Udu cho san xult bOt gily.
2. Hdm lupng xenluloza cua ludng Hda Binh Id
48,77%, tuong duong vdi mOt sd lodi tre dupe khai
thdc tai mOt sd dja phuong khdc vd ciing ngang bdng
vdi nguydn Udu gd thudng dimg lam nguydn Udu
trong sdn xult gjly. Ddy Id mOt trong nhimg cfai tidu
quan trpng nhlt dd ddnh gid cfalt lupng nguydn Udu
trong san xult bOt gily. Vi vdy, cd tfad khIng djnfa,
nguydn Udu ludng Hda Binh hodn toan cd thd sir
dung Ai san xuat bdt gily sun phat.
3. Ham Itrpng ciia linhm trong ludng Hda Binh
24,74% la khdng ldn, it gdy trdr ngai cho qud trinh gia

cdng chd bidn ddc bidt Id trong san xult bOt gily.
4. Nguydn Udu luong Id mOt loai nguydn Udu dd
nlu, cti thd kfai tfaay ddi tfadi gian, nfaidt dO, lupng
fada chit sir dting thi hidu suit vd tinh chit bpt tiiay
ddi theo dting quy ludt, khdng khdc gi so vdi cdc
nguydn Udu khdc.
5. Thdi gian nlu thicfa fapp nfalt tfaeo phuong
phdp sun phdt cho cdy ludng Hda Binh Id 90 phtit,
nhidt do 16(f'C, lupng hda chit sir dting la 18% vd cho
hidu suit bot ciing khi tdt.
TAI UEU 1HAM KHAO

1. lin J. X., He X. Q., Lignification and Ugnin
heterogeneity for various age classes of bamboo
(Phyllostachys pubescens) stems(J]. Pfaj^iologia
Plantarum, 2002.
2. Parameswaran N., Liese W., Ultrastructural
aspects of bamboo ceUs Q]. CeUu. Chem. and
Technol., 1999.
3. Dence C. W., Chemistry of Chemical Pulp
Bleaching. In: Pulp. Bleaching Principles and
Practice Eds. TAPPI Press, 1996.

RESEARCH ON THE POTENTIAL FOR MAKING PULP FROM Dendmcalamus baratiis
HSUCHETD.Z.U
Cao Quoc An
Summary
Dendro calamus baratus Hsuch et D. Z. Li big sized bamboo species, widely grown in Thanh Hoa, Hoa Binh,
Nghe An, Ha Tmh provinces. Traditionally, it has been mainly used as raw materials for crafts production of

woodlike based boards, or for housing in rural areas. At present Dendrocakunus baratus is used to produce
paper pulp; however, the basic data on the chemical characteristics, as well as technology of chemical pulp
from the Dedro calamus baratus Hsuch et D. Z. Ii is rarely published. In these experiments raw materials
used are 3 years old Dedrocalamus baratus Hsuch et D. Z. M planted in Luong Son district, Hoa Binh
province. The experiments were conducted in the laboratory Center of wood technology faculty- Vietnam
Forestry University. The chemical analysis results are as foUowing:fiberlength 2.29 mm,fiberwidth 0.016
mm, crude fiber 143, ash contents 1.08%; the extractives in hot water are of 8.10%, in cold water 3.59%, in 1%
solution of NaOH 17.65%, ceUulose content 48.77%, Ugnin content 24.74%, pH 5.65; the cooking temperature
is 160''C; insulation duration is 90 min; chemical reagent ratio 18%.
Keywords: Brightness of pulp, Hoa Binh bamboo, sulfate pulp, yield of pulp.
Ngudi pfadn biOn: GS. TS. Hd Cfau Cfavr

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