Abstract
Eri silkworm pupae (Samia ricini) are very interesting creatures since they can be developed as a sustainable high protein food source for human beings and animals, and their cocoons can be used for silk production. At present, Thai silk is very famous for its special qualities, whereas the requirement of pupae as food grows increasingly, in particular, canned pupae with seasoning favors. Like other food products, size uniformity is required. Therefore, in this paper, a rotary drum screen with internal screw flights was designed and constructed for separating Eri silkworm pupae into two groups with different sizes. The experiments were conducted to evaluate its effectiveness. The results show that the optimal angular speed of the screen was 20 rpm and the screw pitch value was 10 cm. These parameters resulted in the accuracy percentage of pupa screening of 94.3% and the working capacity of 8.6 kg/h.
Highlights
An Eri silkworm pupa (Samia ricini) becomes a new interesting creature that can be developed as a sustainable high protein food source [1]
During passing through the drum, undersized pupae will fall through screen openings between bars and are collected in the trough (No 6) underneath, while acceptable pupae will remain in the drum and are brought towards the opposite end of the drum screen (No 7)
The working capacity is defined by the ratio between the mass of all pupae and time spending for sorting, while the accuracy percentage is the ratio between the number of pupae being correctly separated and the number of all pupae being tested
Summary
An Eri silkworm pupa (Samia ricini) becomes a new interesting creature that can be developed as a sustainable high protein food source [1]. Two important processing steps in making canned Eri silkworm pupae [2] include frying and drying. Frozen pupae are manually sorted according to their size. This operation is very timeconsuming, laborious and non-consistent. The aim of this research project is to design and construct a drum screen that can separate undersized pupae from pupae with acceptable size. Since there is no product quality standard for Eri silkworm pupae, the size which is acceptable is ambiguous. Pupae with different size: (a) undersized pupae and (b) acceptable pupae
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