Cotton, Sisal, and Jute Mills by J

Br J Ind Med: first published as 10.1136/oem.19.1.9 on 1 January 1962. Downloaded from Brit. J. industr. Med., 1962, 18, 9. BYSSINOSIS: THE ACUTE EFFECT ON VENTILATORY CAPACITY OF DUSTS IN COTTON GINNERIES, COTTON, SISAL, AND JUTE MILLS BY J. C. GILSON,* H. STOTT,t B. E. C. HOPWOOD,+ S. A. ROACH,§ C. B. McKERROW,* and R. S. F. SCHILLING§ (RECEIVED FOR PUBLICATION JULY 14, 1961) Studies of ventilatory capacity change in small groups of employees during a shift in a cotton mill and in three cotton ginneries in Uganda, a sisal factory in Kenya, and a jute mill in England, have demonstrated that an effect is produced by the dust in the cotton mill and in a very dusty ginnery but not in two other less dusty ginneries. No significant effect was detected in the sisal factory or in the jute mill despite much higher dust concentrations than in the cotton mill. The dust sampling instruments gave the weight in three sizes: Coarse (>2 mm.), medium (7,u to 2 mm.), and fine (< 7,). The samples were analysed for protein, mineral (ash), and cellulose (by difference). The fine and medium sisal and jute dusts contain less protein than cotton dusts. The physiological changes observed in the employees in the cotton mill indicate the need for general dust measurement and control, even when new carding machinery is installed in a new mill. copyright. The ventilatory capacity of normal subjects and effect of exposure to the dusts during a day on of those with byssinosis falls during the course of a workers in a cotton textile mill and in cotton day's exposure to the dust in cotton mill card-rooms ginneries in Uganda, and also in a sisal factory in (McKerrow, McDermott, Gilson, and Schilling, Kenya and in a jute mill in England. 1958; Bouhuys, Lindell, and Lundin, 1960). The Mair, Smith, Wilson, and Lockhart (1960) found agent producing this effect has not yet been isolated. no symptoms resembling those of byssinosis in jute http://oem.bmj.com/ Davenport and Paton (1962) have shown that cotton workers in Scotland, and no change in ventilatory dust extracts contain a smooth muscle contractor capacity during the day, but there were symptoms of substance which may be responsible. Antweiler byssinosis in flax workers, and those with these (1960) believes that the agent is a histamine releaser, symptoms showed the characteristic change of and Pernis, Vigliani, Cavagna, and Finulli (1961) ventilatory capacity during the day. Smiley (1961), have suggested that the effect may be due to bacterial in a delightful review of the history and present endotoxins. Tuffnell (1960) suggests that the sub- position in mills in Ulster, showed clearly that the stance is in the bracts and pericarp of the cotton boll; symptoms of byssinosis were recognized there more on September 23, 2021 by guest. Protected this is supported by Nicholls (1962) who has con- than a hundred years ago in the flax industry, and firmed the presence of a smooth muscle contractor are still encountered and may be associated with substance in extracts of these parts of the plant and disability (Logan, 1959). has shown that it caused contraction of isolated Byssinosis has not been reported in workers in human bronchial muscle. Nicholls has also investi- cotton ginneries where the cotton seed is separated gated extracts of dust from flax, sisal, and jute from the linters, so when an opportunity arose it mills and found decreasing activity in this order. seemed worth investigating whether the acute effect Here we report complementary studies of the on ventilatory capacity also occurred in workers in Present addresses: these factories. *Medical Research Council, Pneumoconiosis Research Unit, Liandough Hospital, Penarth, Glamorgan. tTuberculosis Chemotherapy Centre, Government Tuberculosis General Plan and Methods Institute, Chetput, Madras-31, India. tMinistry of Health, Entebbe, Uganda, East Africa. The general plan was the same in all the investi- §The Department of Occupational Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, W.C.1. gations. Repeated measurements of ventilatory 9 Br J Ind Med: first published as 10.1136/oem.19.1.9 on 1 January 1962. Downloaded from 10 BRITISH JOURNAL OF INDUSTRIAL MEDICINE capacity of the workers (male) normally employed components in all cases. In view of the findings of in these mills and factories were made during the McKerrow, Roach, Gilson, and Schilling (1962) it course of a day when they were not exposed to dust, seems probable that the quantity of fine dust and and a similar series of measurements was carried particularly the mass concentration of its protein out on a day when they were doing their normal job. may best be related to the acute change of ventilatory The men who volunteered were, in general, those capacity. working in the dustier processes. A. A Cotton Textile Mill in Uganda.-This is a The forced expiratory volume (F.E.V.0.75) was large, recently opened, modern, well-lighted mill measured with a standardized spirometer and timer under a single roof (Fig. 1) spinning medium length (McKerrow, McDermott, and Gilson, 1960) and is staple (30/32 in.). The carding machines are at one expressed as an indirect maximum breathing capacity end of the main factory which also houses the (I.M.B.C.) by multiplying the volume by 40. Special intermediate frames and spindles; only the blow- care was taken to avoid or allow for changes in room is separate. The general current of air is from ambient temperature which might have led to a bias the spindles towards the cards, but there is no local in the readings during the course of a day. In the dust extraction over the cards except during stripping investigations in Uganda the peak expiratory flow and grinding. As the lay-out is on one floor there is (Wright and McKerrow, 1959) was also measured, probably more general dispersion of dust from the and in Kenya the F.E.V. was measured in addition cards to other parts of the mill than is encountered on a low inertia spirometer (Bernstein, D'Silva, and in a typical multi-storey Lancashire mill. Mendel, 1952). Weight and sitting height were Twelve African regular workers (four strippers recorded, and age was estimated for the African and grinders, one blow-room worker, three drawers, workers from whom an accurate statement could not and four spinners) volunteered for the tests. They be obtained. had worked for between 44 and 15 months in the The airborne dust in the mill or factory was mill; their mean age was estimated at 23 years sampled over a whole shift in the area in which the (range 19 to 36). The "out-of-dust" tests of ventila- workers were employed in order to provide a gravi- tory capacity were made at 4, 7, and 10 p.m. on a metric measure of dust concentration, and to obtain Sunday (their previous shift ended at 8 a.m. on the copyright. material for compositional analysis. Saturday). The "in-dust" tests were made at 3.45, The equipment described by Roach and Schilling 8, and 11.15 p.m. on the Monday, the first test being (1960) was used. This gives three sized components made before they had started work. for the dust: (i) "Coarse"-this is the long fibres together with some adherent smaller dust which is Phlysiological Results.-Table 1 shows that the retained on the 2 mm. gauze in front of the filter mean I.M.B.C. of the workers did not fall signifi- cantly "out-of-dust", but "in-dust" there was an paper; this fraction (too large to enter even the http://oem.bmj.com/ upper part of the respiratory tract) is removed average fall of7 5 I./min. which was highly significant. periodically to prevent blocking the sampler; However, the difference in rate of change of I.M.B.C. (ii) "medium and fine" together is the dust which on the two days could reflect chance variation collects on the filter paper behind the gauze; (iii) (0O20>p>0 10). The peak flow measurement fell the "fine" is the dust which collects on a filter paper from an average of 481 I./min. to 451 I./min. out of in front of which is a horizontal elutriator designed dust, and from 444 l./min. to 424 1./min. in dust, but to cut off 100% of particles >7 1 ,u equivalent dia- neither of these changes is significant. This is not surprising because previous studies have shown that meter (Wright, 1954). The weight of "medium" dust on September 23, 2021 by guest. Protected is obtained by difference. the peak flow is a less sensitive measure of change Aliquot samples of the dusts were analysed for because it is more dependent than the F.E.V. on organic nitrogenous matter, i.e. protein, by micro- the effort and hence motivation of the subject. One Kjeldahl, and for ash, i.e. mineral, and the difference man, aged about 22, had an I.M.B.C. of only 50 reported as cellulose which is its principal constituent. 1./min. which fell by nearly 500% while he was It is important to emphasize that the short period working in the dust. This man had worked for 15 of these investigations seriously limited the compre- months in the mill. hensiveness of the dust sampling, so that the results Dust Concentrations.-The dust samples were are indications of the dustiness and are not com- collected near the middle of the bank of carding parable in accuracy to the findings in Lancashire machines.

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