Adopt energy conservation

waste reduction

Adopt energy conservation and waste reduction

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. In 2020, the cost of waste disposal (excluding domestic wastes) came to approximately NTD 670,000. Due to the reduction in waste generated and operating revenues, our cost for waste handling in 2020 fell by approximately NTD 900,000 compared to that of 2019.

Energy-Saving Accomplishment

In 2020 YOKE’s total annual power consumption converts to 30,000 GJ as expressed in heart (109 joules, or GJ). It was a decrease of 3,309 GJ compared to that of 2019.In light of the decline in operating revenues as brought about by COVID-19, our process power utilization efficiency for 2020 also came short compared to that of 2019. Nevertheless, we still managed to achieve a slight improvement compared to that of 2018. In 2020, 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 139,400 kWh of energy, which translates to 70,936 Kg CO2e when converted to its greenhouse gases equivalent (calculated based on the carbon emission coefficient of 0.509 CO2e/kWH of power for public electricity sales in 2019 as published by the Energy Bureau of the Ministry of Economic Affairs in July 2020). 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. Through improvement in production efficiency in 2020, we were able to boost our energy efficiency even further. Our original process of spring pin feeding that involved manual feeding of materials was replaced by automated feeding. After the implementation of equipment improvement, our observation on work efficiency showed that the improvement helped to save as much as 6.25% of material feeding time, which in turn reduced equipment idle time. For our aluminum forging operation, we went from the forging process of “one machine, one mold” to “one machine, two molds” for the process and by changing our production model, we were able to save the time it would take for one machine to perform the same task. For our continuous furnace, the cycle that goes from feeding to discharge takes 3 hours to complete, and this meant that we had to finish the feeding process no later than 3 hours prior to closing time each day. In 2020, we installed a feeding chute to the equipment that enabled us to delay the deadline for material feeding, which enabled us to increase the utilization rate by 6.3% by having our nightshift employees collect the discharged parts. As the continuous furnace consumes the most amount of power in our processes, an improvement in its utilization translates to a substantial boost in our energy efficiency.

Energy-saving equipment replacement project for 2020 Yearly estimated power saving Conversion to GHG emission reduction (Kg CO2e)
Installation of inverter for the primary pump of salt bath process cooling water 68,353 34,792
Installation of inverter for the secondary pump of salt bath process cooling water 68,353 36,432
Lighting fixture/air-conditioning schedule control 2,659 1,352
Total energy saving 139365 139,365 70,936

Inspection item pH value COD SS
Regulatory standards 5~9 480 320
Lowest inspection value 7.3 8 1.8
Highest inspection value 8.7 469 168

Water Management

YOKE’s primary sites of operation (Factories 1 and 2) are both situated at Taichung Industrial Park in Taichung City, and the source of water for both facilities comes from Taiwan Water Company. The use of water in our processes is primarily attributed to the mixture of oil and water for our CNC lathe and milling processes along with the evaporation of water caused when products in a state of high heat from the thermal processes are immersed in a salt bath. Our source of effluent discharge primarily comes from the unscheduled replacement of water used in our salt baths when the used effluent is discharged 100% to the wastewater treatment plant at Taichung Industrial Park through dedicated pipelines for the subsequent treatment of the wastewater. Taichung Industrial Park Waste Water Treatment Plant has established its “Incoming Effluent Limit and National Effluent Discharge Standards” (available at, which YOKE is required to comply for its effluent discharge. In addition, the treatment plant has also dispatched personnel to obtain a sample of our effluent to test the water quality, with test items covering water temperature, pH value, COD, and SS. Incidentally, COD in our effluent was found to exceed the regulatory standards (COD:643.5) in January 2020. But after inspections and tests for other potential causes that could lead to the excess in COD found no anomalies, the wastewater treatment plant carried out further test and analysis on the effluent sample and found the sample to be compliant by being under the regulatory standards. As YOKE consumes relatively less water compared to other traditional industries, with Taichung being a region without significant water pressure, we are not exposed to risks of impact from water-related factors. Nevertheless, climate change has caused the precipitation level in Central Taiwan to decline sharply in 2020. As a result, YOKE has preemptively implemented relevant water-saving measures with relevant water storage and replenishment plans. We are scheduled to promote water-saving measures for our cooling towers as part of our office water consumption response plan to mitigate water shortages in 2021. As GRI Standards 303 Water (2018) became applicable, we have expressed our water resource statistics with further details, including unit water consumption, water consumption and effluent discharge, to adjust our presentation of relevant water resource statistics. However, since no data was collected for effluent discharged prior to 2019, the total effluent discharge and water consumption statistics are only applicable to 2020. Our total consumption for 2020 came to 29.02 mega liter (ML), which is a decrease of 3.11 ML compared to that of 2019. The decrease is mainly attributed to the impact of COVID-19 in 2020 that significantly reduced our operating revenues. Consequently, it has also reduced our water consumption compared to 2019. As we introduced iron forging, punching and medium frequency equipment along with the continuous water-cooled furnace for our thermal treatment processes in 2019 to reduce process outsourcing for forging, processing and thermal treatment, our in-house production grew in capacity and this is reflected in our unit water consumption in 2020 compared to that of 2019.

Waste management

All industrial wastes we generate in our processes are non-hazardous in nature. In 2020, we outsourced industrial waste disposal under three categories to our contractor to dispose of by landfill and other two means of disposal. All of our wastes have been transported and handled by licensed service providers to carry out the necessary operations that follow. In 2020, our waste due for final disposal by landfill (category D-2499) came to 13.44 tons and disposal by landfill (category D-1099+D-1799) at 38.95 tons in volume respectively, adding to a total of 52.39 tons. This translates to a reduction of 40.51 tons (43.61%) compared to that of 2019. 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 2020, we managed to reduce our generation of waste iron from forging and waste iron chips and our output in terms of “waste iron from forging kg/NTD 1,000,000 revenue” hadn’t been affected by the decline in our operational revenue as we successfully brought down the volume from 171.86 in 2019 to 161.08 in 2020 (a decrease of 6.27%). As the application of grease for punching could lead to a lower yield rate for subsequent flash butt welding, we had therefore made an improvement to our equipment by connecting a vaporizer to the lathe in order to apply fresh grease in fixed volumes at fixed intervals in 2020. This in turn enabled us to achieve the desired cleanliness for acceptable WIP for subsequent flash butt welding to improve yield rate while reducing the time loss that is needed for manual cleaning of the WIP. For products that involve flash butt welding of 45 wire diameter material, we have changed our production equipment while simplifying the steps of operation involved. After the implementation of the improvement in 2020, our yield rate increased substantially from 72% to 98% and it enabled us to dramatically reduce the volume of scrapped products we were generating. We have collaborated with NCTU in one of our many industry-academia collaborations to perform scientific testing and analysis of cutter optimization so that we can eliminate cutters that are not suited to our operations while designing specific program tools for cutter application to reduce the wear and tear on the cutters, thereby preventing the generation of waste. We proposed the waste iron chip disposal improvement project in 2019 and acquired a chip compactor that we can use to compact the iron chips and recover the used cutting mixture. After verifying the effectiveness of the improvement, we were able to reduce the bulk of the iron chips to merely 10% of their original size through compacting. This enabled us to save a significant amount of storage space that we used to reserve for iron chips. However, we also found it difficult to control the quality of the cutting mixture recovered this way. We took a different approach and instead fed the compacted iron scraps directly to the processor. After two months of actual testing, we were able to recover about 1,440 liters of cutting mixture and that meant a reduction of 8,640 liters of cutting mixture saved in a given year. Not only that, it would also reduce the volume of scrap oil we would have to handle.

Industrial waste category and code Primary component
D-1099 Dust particle
D-1799 Scrapped oil mixtures
D-2499 Furnace slag, oxide scale, welding dreg

Green Culture

The green area connecting our administrative building and Factory 1 exceeds the legally required area and we have contracted a professional horticultural company to take care of the greening to enhance the landscape of the working environment. Not only that, YOKE has also adopted hill slopes near the Taichung Industrial Park area in an effort to improve the aesthetics of the industrial environment. We have installed water-saving devices to the faucets for conservation and implemented schedules for lights-out periods in the office areas for light fixtures and air-conditioning within our premises. We have also set up patrol rosters for employees to take turns to inspect different parts of the building to ensure that the lights have been turned off. YOKE also promotes the classification of waste resources for recycling purposes on its premises and makes sure that each department properly classifies recyclable resources in the corresponding containers for waste disposal.

3D printers improvement project

In February 2020, we purchased 3D printers that we can use to design and print FRP jigs to replace the existing metallic jigs. The difference in material helped eliminate accidental scratches on the WIP that could lead to NG products in manufacturing and saved the Company from having to purchase metallic jigs and incurring losses from their wear and depreciation. With the control over our jibs' structural design, we chose to create jigs with hollowed design but produce sufficient structural strength with the least amount of material used to reduce our use of FRP. Our FRP jigs have thus been extensively used in the manufacturing of our N-series products and some products under the 8-series.


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#39, 33rd Road, Taichung Industrial Park, Taichung 407, Taiwan 

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#39, 33rd Road,Taichung Industrial Park, Taichung 407, Taiwan