Adopt energy conservation

waste reduction

Adopt energy conservation and waste reduction

Environmental Protection and Improvement

Back in 2018, YOKE initiated the introduction of the ISO 14001 environmental management system and later in 2019, we have completed the verification process for the system in 2019 and obtained certification. This was a milestone that marked a new stage in the Company’s progress in environmental protection. And now, YOKE continues to implement and improve upon its efforts in environmental protection through the PDCA framework.

The total waste disposal cost in 2020 (excluding domestic waste) was approximately NT$830,000, and due to an increase in production capacity, the waste disposal cost in 2021 increased by approximately NT$160,000 compared to 2020 .

Energy-Saving Accomplishment

The annual energy consumption of YOKE in 2021 is converted into heat energy of 37,123.85 GJ (109 joules), an increase of 3,988 GJ compared to 2020. The increase in orders resulted in higher process electricity efficiency, gas and diesel usage than in 2020, but still a slight  improvement compared to 2018.

In 2021, we continued to grade existing equipment to variable frequency conversion equipment and introduced energy-efficient equipment and LED lamps. Based on the electricity saved from equipment replacement, we have managed to save approximately 209,700 kWh of energy, which translates to 105,245 Kg CO2e when converted to its greenhouse gases equivalent (calculated based on the carbon emission coefficient of 0.502 CO2e/kWH of power for public electricity sales in 2020 as published by the Energy Bureau of the Ministry of Economic Affairs in Sep 2021). This also meant that YOKE has successfully achieved the target of saving 1% electricity each year as spelled out by the Ministry of Economic Affairs consecutively for the past 5 years.

In 2021, we will continue to optimize energy efficiency by improving production efficiency. Forging molds are heated by gas. By adding a medium pressure regulator, the gas output is stabilized and excessive gas consumption is reduced. The actual average monthly usage was reduced by about 22% after the improvement. The heat treatment salt bath process has been improved by replacing the 24-hour timer with a weekly electronic timer to save electricity generated by heating the empty furnace on the two days of the weekend, saving approximately 153,754 kWh a year.

Energy-saving equipment replacement project for 2021 Yearly estimated power saving Conversion to GHG emission reduction(Kg CO2e)
Salt bath thermal treatment furnace timer improvement 153,754 77,185
Plastic injection molding machine VR450 (servo energy-saving type) procurement 16,896 8,482
Salt bath washing tank motor with pre-set inverter 39,000 19,578
Total power savings 209,650 105,245

Water Management

YOKE buys its water from Taiwan Water Company, and is sourced from the Shigang Reservoir at the downstream of Dajia River. The total water consumption in 2021 was 19.44 million liters (ML), a decrease of 9.58 ML compared to 2020. The discharge of process wastewater is 100% processed by the wastewater treatment plant in Taichung Industrial Park (no process water is used in the Factory 3 located in Chuan Hsing Industrial Park) for subsequent disposal of wastewater. 
The Taichung Industrial Park has announced the "Table of the Intake Limits and National Wastewater Discharge Standards of Taichung Industrial Park Sewage Treatment Plant" ( YOKE shall discharge wastewater in accordance with the regulated discharge standards, and the water quality shall be tested by the wastewater plant for sampling, including water temperature, pH, COD and SS. The total wastewater discharged in 2021 was 16.20 ML, all of which met the discharge control standards.
Since the water consumption used by YOKE is lower than that of general industry, the main reasons for water loss are evaporation from cooling water towers, evaporation from salt baths and regular water changes. Taichung is not a water stress area and has no water-related impacts. However, due to climate change, the rainfall in the central Taiwan will drop sharply in 2021, so YOKE is taking water conservation measures and contingency plans for water storage and replenishment in advance. In response to the impact of climate change, YOKE will implement water saving measures in cooling towers, adjust the frequency of water change in salt bath furnace process, and watering frequency in gardening in order to cope with the tight water situation.

Inspection item pH value COD SS
Regulatory standards 5~9 480 320
Lowest inspection value 7.3 8.7 2.5
Highest inspection value 8.4 422 189

Note: The actual values of each test item have been derived from the actual emission data from each factory, with both the highest and lowest values disclosed. This accounts for the significant discrepancies in the data.

Waste management

The industrial wastes produced by YOKE in the manufacturing process are not hazardous wastes, and there are 3 types of direct disposal performed by outsourced vendors in 2021, and the end use of outsourcing is other treatment (physical treatment). The waste generated by YOKE will not cause significant impact to the environment. All wastes are removed through qualified vendors and checked through on-site or internal forms to confirm that the wastes are properly handled by the disposal operators to ensure that the wastes generated by YOKE will not cause significant impact on the environment. There are five types of recyclable waste, namely forged steel, steel scrap, aluminum, aluminum scrap and plastic, all of which are disposed of by recycling. In 2021, a total of 65.62 tons will be directly disposed of, and the disposal method will be in accordance with the EPA's regulations, an increase of 13.65 tons compared to 2020, mainly due to the increase in production.

Industrial waste category and code Primary component
D-1099 Dust particle
D-1799 Scrapped oil mixtures
D-2499 Furnace slag, oxide scale, welding dreg
Disposal type Recycling Direct disposal
Disposal method Recycled use Other disposal operations
2020 435.90 tons 51.97 tons
2021 858.50 tons 65.62 tons

In addition, the promotion of 6S and CIT projects that went on over the years has been verified by examining the composition of scrap materials collected. We found waste iron from forging and waste iron chips to make up the bulk of the waste scrap iron. In 2021, the order rate increased and the forging and processing capacity were also increased. By running at full capacity to meet the urgent orders, the volume of waste iron from forging as well as waste iron chips increased, and the output of "forging scrap iron kg/NT$ million in revenue" also increased.

未命名-2Reduction in forging scrap ironForging material diameter improvement tests were conducted. Through mold improvement and parameter change experiments, we successfully improved the forging material diameter of three products and increased the material usage rate. One of the popular products' line diameter was reduced from 22 to 21, and the material utilization rate was increased by 7%. In 2022, we will continue to promote the forging material ratio improvement project and continue to reduce the amount of recycled material.Waste oil reductionThermal treating continuous furnace machines require quench oil changes every 8 years at 6,500 gallons of quench oil per change. In 2021, a quench oil centrifuge will be introduced to extend the life and usage of quench oil by filtering it and to control the quality of production through regular monitoring of quench oil quality.Reduction in use of pen markersThe alignment line of the fall arrestor cable is marked by pen marker, which results in a high consumption of pen and affects the working time. By replacing manual drawing with press-fit fixtures and replacing pen markers with ink, we can reduce the repetitive drawing time and stabilize the length of lines, and reduce the number of pen markers by 288 a year.3D printing material reduction By replacing metal fixtures with 3D printing machine, we can avoid the defective rate caused by scratching the surface of workpiece and reduce the purchase and consumption of metal fixtures. The structural design of the fixture is hollowed out to meet the minimum usage required for structural strength, saving the usage of plastic steel. It is widely used in N Series products and a small number of 8 Series products. In 2021, YOKE changed to standalone nozzles to improve the clogging of nozzles that cause printing failure and to increase the hourly print length from 3.57 meters per hour to 4.09 meters per hour.

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