Briquetting chips & dust
The chips and dust produced during the machining of plastic parts often cause problems due to the large volumes and the resulting space requirements for storage. Disposal can also be associated with difficulties and high costs. For many of these applications, briquetting is a welcome alternative solution.
SPÄNEX is one of the leading manufacturers of extraction systems and briquetting presses and is therefore in a position to implement complete plant engineering solutions. The briquetting presses are an important component of the systems when the task is to facilitate the handling of chips and dust, to minimise disposal costs or to recycle the chips and return them to the production process..
The characteristics of the chips and dusts are diverse, so that in the case of special materials, no specific statements can initially be made about the effect of briquetting during the initial consultation with our customers. In these cases, test pressings are carried out in the factory in order to be able to provide information about the briquettability of the customer's material, the achievable quality of the briquettes and any necessary preparation of the starting material. The plants can then be planned and detailed quotations drawn up on the basis of the established.
A typical practical application is the briquetting of polystyrene chips and dust. When milling polystyrene blocks, it is well known that large quantities of chips and dusts are produced that have to be extracted. The resulting material residues are very voluminous and, without measures, lead to high disposal costs. Briquetting is a tried and tested solution that offers the following advantages:
wide range of applications related to the material structure (flaky to fine),
high compaction and thus considerable reduction of the storage volume and
low energy input.
The characteristic size with regard to the chip volume is the bulk density. Styropor milling chips have a bulk density between 12 and 20 kg/m³. Basically, the chip/dust mixture can be briquetted very well. Compressions of 1:40 up to 1:70 can be achieved. For planning purposes, this means that the storage volume of 1 m³ of polystyrene milling chips can be reduced to 30 - 50 l.
Two machines from the extensive range of SPÄNEX briquetting presses were optimised for these applications, with the hourly compactable chip volume being the primary objective. The two Styrofoam machines score with the following data:
![[Translate to English:] Brikettierpresse Baureihe SHB 60-125](/fileadmin/_processed_/8/b/csm_1_SPAENEX_Brikettierpresse_1e59e20590.webp)
| Technical data | Machine 1 | Machine 2 |
| Styrofoam chip throughput in m³/h | 1,8 | 3,0 |
| Briquette shape, 8-sided in mm | 125 x 70 | 125 x 70 |
| Drive motor in kW | 7,5 | 11 |
Another practical example is the briquetting of chips made of polyethylene HD. The shape and structure of the chips can be described as follows:
Chips rolled, approx. 0.5 - 2 cm long, low dust content.
Bulk density approx. 120 kg/m³.
The following data was obtained from the test pressings carried out for the individual machines from the standard series:
![[Translate to English:] Brikettierpresse Baureihe SHB 150-250](/fileadmin/_processed_/a/a/csm_2_SPAENEX_Brikettierpresse_064dbcf0a1.webp)
| Technical data | Machine 1 | Machine 2 | Machine 3 |
| Throughput PE-HD chips in m³/h | 0,5 | 1,0 | 1,8 |
| Briquette shape, 8-sided in mm | 125 x 70 | 125 x 70 | 125 x 70 |
| Drive motor in kW | 5,5 | 7,5 | 11 |
Based on the determined data and from the indication of the chip quantity, the suitable machine can be selected for each application. It goes without saying that for larger material quantities, two or three machines can be operated in parallel so that the required throughput rates are achieved.
Advantages at a glance
- Proven solution
- Reduction of the storage volume
- Lower disposal costs
- breites Einsatzspektrum
- Wide range of applications
- Complete system solutions from one source
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