| CHF millions | Note | 30.06.2023 | 31.12.2022 | 30.06.2022 | 
| ASSETS | 
 | 
 | 
 | 
 | 
| Short-term assets | 
 | 
 | 
 | 
 | 
| Liquid funds | 
 | 83.4 | 180.3 | 229.3 | 
| Marketable securities | 
 | – | – | – | 
| Accounts receivables | 
 | 187.5 | 179.0 | 178.2 | 
| Other short-term receivables | 
 | 40.9 | 31.3 | 17.3 | 
| Inventories | 
 | 198.6 | 155.5 | 151.0 | 
| Accruals | 
 | 6.2 | 6.2 | 4.5 | 
| Subtotal short-term assets | 
 | 516.6 | 552.3 | 580.3 | 
| Long-term assets | 
 | 
 | 
 | 
 | 
| Tangible assets | 
 | 751.3 | 661.6 | 559.2 | 
| Financial assets | 
 | 18.6 | 17.3 | 17.6 | 
| Intangible assets | 
 | 3.2 | 3.3 | 3.9 | 
| Subtotal long-term assets | 
 | 773.1 | 682.2 | 580.7 | 
| Total assets | 
 | 1 289.7 | 1 234.5 | 1 161.0 | 
| LIABILITIES | 
 | 
 | 
 | 
 | 
| Liabilities | 
 | 
 | 
 | 
 | 
| Short-term liabilities | 
 | 
 | 
 | 
 | 
| – Accounts payables | 
 | 165.0 | 209.0 | 139.1 | 
| – Short-term financial debts | 
 | 56.1 | 10.2 | 11.9 | 
| – Other short-term liabilities | 
 | 30.8 | 25.9 | 30.1 | 
| – Deferrals | 
 | 53.1 | 31.8 | 43.6 | 
| – Short-term provisions | 
 | 9.5 | 6.7 | 6.7 | 
| Subtotal short-term liabilities | 
 | 314.5 | 283.6 | 231.4 | 
| Long-term liabilities | 
 | 
 | 
 | 
 | 
| – Long-term financial debts | 
 | 166.1 | 168.6 | 177.8 | 
| – Other long-term liabilities | 
 | 0.6 | 0.7 | 0.8 | 
| – Long-term provisions | 
 | 31.1 | 32.3 | 32.9 | 
| Subtotal long-term liabilities | 
 | 197.8 | 201.6 | 211.5 | 
| Total liabilities | 
 | 512.3 | 485.2 | 442.9 | 
| Shareholders' equity | 
 | 
 | 
 | 
 | 
| Share capital | 
 | 19.8 | 19.8 | 19.8 | 
| Capital reserves | 
 | 0.3 | 0.3 | 0.3 | 
| Retained earnings | 
 | 706.6 | 688.5 | 707.7 | 
| Consolidated result | 
 | 50.7 | 40.7 | – 9.7 | 
| Subtotal shareholders' equity | 
 | 777.4 | 749.3 | 718.1 | 
| Total liabilities | 
 | 1 289.7 | 1 234.5 | 1 161.0 | 
| CHF millions | Note | Half Year 2023 | Half Year 2022 | 
| 
 | 
 | 
 | 
 | 
| Net sales from goods and services | 1 | 477.9 | 435.0 | 
| Other operating income | 
 | 10.9 | 7.3 | 
| Changes in inventories | 
 | 39.0 | 16.2 | 
| 
 | 
 | 
 | 
 | 
| Material expenses | 
 | – 75.1 | – 63.7 | 
| Energy expenses | 
 | – 140.2 | – 112.6 | 
| Personnel expenses | 
 | – 97.0 | – 90.0 | 
| Depreciation/impairments of tangible assets | 
 | – 33.7 | – 36.9 | 
| Amortisation | 
 | – 0.8 | – 0.9 | 
| Other operating expenses | 
 | – 110.9 | – 106.1 | 
| 
 | 
 | 
 | 
 | 
| Operating result (EBIT) | 
 | 70.1 | 48.3 | 
| Financial result | 
 | – 3.9 | – 5.6 | 
| 
 | 
 | 
 | 
 | 
| Ordinary result | 
 | 66.2 | 42.7 | 
| Non-operating result* | 
 | – 0.5 | 0.6 | 
| Extraordinary result | 2 | – 0.4 | – 46.5 | 
| 
 | 
 | 
 | 
 | 
| Consolidated result before income taxes | 
 | 65.3 | – 3.2 | 
| Income taxes | 
 | – 14.6 | – 6.5 | 
| 
 | 
 | 
 | 
 | 
| Consolidated result | 
 | 50.7 | – 9.7 | 
| 
 | 
 | 
 | 
 | 
| Earnings per share | 3 | 
 | 
 | 
| Undiluted earnings per registered share A in CHF | 
 | 2.56 | – 0.49 | 
| Undiluted earnings per registered share B in CHF | 
 | 0.51 | – 0.10 | 
| Diluted earnings per registered share A in CHF | 
 | 2.56 | – 0.49 | 
| Diluted earnings per registered share B in CHF | 
 | 0.51 | – 0.10 | 
*This includes depreciation of CHF 0.4 million (2022: CHF 0.5 million) on non-operating real estate and buildings.
| CHF millions | Note | Half Year 2023 | 2022 | Half Year 2022 | 
| 
 | 
 | 
 | 
 | 
 | 
| Consolidated result | 
 | 50.7 | 40.7 | – 9.7 | 
| Depreciation and amortisation | 
 | 34.9 | 73.1 | 38.3 | 
| Impairments | 
 | – 0.3 | 25.7 | 45.0 | 
| Change in provisions | 
 | 0.2 | 3.0 | 6.2 | 
| Result from disposals fixed assets | 
 | 0.2 | 0.5 | – | 
| Other non-cash items | 
 | – | – 0.8 | 1.6 | 
| Operating cash flow before change of net working capital | 
 | 85.7 | 142.2 | 81.4 | 
| 
 | 
 | 
 | 
 | 
 | 
| Change in accounts receivables | 
 | – 8.7 | – 46.3 | – 49.3 | 
| Change in inventories | 
 | – 43.8 | – 27.5 | – 22.0 | 
| Change in other receivables, prepaid expenses and accrued income | 
 | – 9.8 | – 19.8 | – 3.2 | 
| Change in accounts payables | 
 | – 43.4 | 80.0 | 0.8 | 
| Change in other liabilities, accrued expenses and deferred income | 
 | 26.3 | 1.9 | 17.5 | 
| Cash flow from operating activities | 
 | 6.3 | 130.5 | 25.2 | 
| 
 | 
 | 
 | 
 | 
 | 
| Investments in tangible assets | 
 | – 127.4 | – 194.1 | – 52.5 | 
| Disposals of tangible assets | 
 | 0.2 | 2.9 | – | 
| Investments in intangible assets | 
 | – 0.6 | – 0.5 | – 0.2 | 
| Cash flow from investment activities | 
 | – 127.8 | – 191.7 | – 52.7 | 
| 
 | 
 | 
 | 
 | 
 | 
| Dividend to shareholders | 
 | – 19.8 | – 25.8 | – 25.8 | 
| Change in short-tem financial debts | 
 | 46.2 | – 2.7 | 2.6 | 
| Change in long-tem financial debts | 
 | – 1.7 | 147.8 | 154.5 | 
| Cash flow from financing activities | 
 | 24.7 | 119.3 | 131.3 | 
| 
 | 
 | 
 | 
 | 
 | 
| Foreign exchange differences | 
 | – 0.1 | – 4.0 | – 0.7 | 
| 
 | 
 | 
 | 
 | 
 | 
| Change in liquid funds | 
 | – 96.9 | 54.1 | 103.1 | 
| 
 | 
 | 
 | 
 | 
 | 
| Liquid funds at the beginning of the year | 
 | 180.3 | 126.2 | 126.2 | 
| Liquid funds at the end of the period under review | 
 | 83.4 | 180.3 | 229.3 | 
| Change in liquid funds | 
 | – 96.9 | 54.1 | 103.1 | 
| CHF millions | 
 | 
 | 
 | 
 | 
| 
 | Share capital | Capital reserves (Agio) | Retained earnings | Subtotal | 
| Sharholders' equity as per 1.1.2022 | 19.8 | 0.3 | 754.4 | 774.5 | 
| Consolidated result | – | – | – 9.7 | – 9.7 | 
| Foreign exchange differences | – | – | – 20.9 | – 20.9 | 
| Dividends | – | – | – 25.8 | – 25.8 | 
| Sharholders' equity as per 30.06.2022 | 19.8 | 0.3 | 698.0 | 718.1 | 
| Consolidated result | – | – | 50.4 | 50.4 | 
| Foreign exchange differentials | – | – | – 19.2 | – 19.2 | 
| Sharholders' equity as per 31.12.2022 | 19.8 | 0.3 | 729.2 | 749.3 | 
| Consolidated result | – | – | 50.7 | 50.7 | 
| Foreign exchange differences | – | – | – 2.8 | – 2.8 | 
| Dividends | – | – | – 19.8 | – 19.8 | 
| Sharholders' equity as per 30.06.2023 | 19.8 | 0.3 | 757.3 | 777.4 |