IMPROVEMENT OF WORK TEMPERATURE AT CONTENT PRINTING WORKSTATION IN PUBLISHERS AND PRINTING CV GRAFIKA DUA TUJUH

CV. Grafika Dua Tujuh is an industry engaged in publishing and printing books and student worksheets located in Klaten. The average output produced daily is 85.400 books and student worksheets, while the company has a production target of 90.000 books and student worksheets. Based on the results of interviews with workers, the level of production that is not maximal is caused by an uncomfortable working environment. Workers in the production room complained about the condition of a hot work environment so that workers feel easily tired and lack of concentration. To overcome the hot workplace, workers often go to the restroom and they work while holding the hand fan. This condition disturbed their concentration and cause work errors. If this condition is carried out continuously, there will be a lot of lost work time which can cause a decrease in productivity. This study aims to analyze the improvement of working temperature conditions in the production room of CV. Grafika Dua Tujuh. This research was conducted by directly measuring thermal conditions in the entire production room of CV. Grafika Dua Tujuh. Determination of the coordinate point of room temperature measurement is based on SNI: 16-7061-2004. Workload assessment is carried out based on SNI 7269: 2009. The results of the measurement of work climate at the content printing workstation are the values of air temperature, humidity, and wind speed i.e 33.32 °C, 39.9%, and 0 m/s. In addition, Wet Bulb Globe Temperature Index (WBGT) value is obtained which is on the verge of a limit, i.e 29.90 °C for the category of the heavy workload with an allocation of working time of 87.5%. The temperature is above the standard set by the Ministry of Health of the Republic of Indonesia No. 1405 / MENKES / 2002 which sets the temperature in an industrial room ranging from 18 °C 28 °C. Improvement for working temperature is done by engineering control, namely the installation of a turbine ventilator or exhaust fan.


INTRODUCTION
The physical work environment affects employee morale and emotions, which consists of: lighting, noise, air temperature, room color, and workplace cleanliness (Senata et al, 2014). The work climate is a combination of air temperature, air humidity, air velocity, and radiation heat with the level of heat dissipation from the body of the workforce as a result of their work (Ministry of Manpower and Transmigration, 2011). There is a relationship between air temperature and the work productivity of workers, if the air temperature increases, the work productivity will decrease (Mamahit, Kawatu, & Molanda, 2016). A comfortable working environment will have an impact on the mental health of the workers (Munandar, 2001). A standard is needed to assess the workload that can be calculated based on the level of calorie needs according to energy expenditure on labor (National Standardization Agency of Indonesia, 2009).
CV. Grafika Dua Tujuh is a book printing industry and student worksheets printing located at Jl. Diponegoro, Karanganom, Klaten. The factory has an area of 7,205 m2 which is located in a residential area. CV. Grafika Dua Tujuh has 112 workers. The average output produced each day is 85,400 books and worksheets, while the company has a production target of 90,000 books and worksheets. Based on the results of interviews with workers, the level of production that is not optimal is triggered by an uncomfortable working environment.
Workers or people who feel uncomfortable at work will lose motivation and take more time off (Wyon & Wargocki, 2005). This can be seen from the way workers at CV. Grafika Dua Tujuh relieves heat. They frequently going to the bathroom and working while holding a hand fan, so that their concentration is distracted and causes work errors. If this condition occurs continuously, there will be a lot of lost work time that can reduce productivity. The results of the preliminary study of measuring the working climate at one of the production room workstations are the air temperature value of 33.32 ° C, air humidity of 39.9%, and wind speed of 0 m / s. This is not following the Indonesian Ministry of Health Number 1405 / MENKES / 2002, which stipulates that the air temperature in industrial rooms ranges from 18 ° C -28 ° C, humidity 40% -60%, and wind speed 0.15 m / s -0, 25m / s (Ministry of Health, 2002).
Research related to the work climate has been done before. One of the studies was conducted in the cracker industry in the frying and steaming section to find out whether the work climate is following the threshold value set by the Ministry of Manpower and Transmigration of The Republic of Indonesia, namely by using the WBGT parameter (Meri & Putra, 2016). One of the designs to improve the work climate is carried out by using a turbine ventilator so that it can reduce the air temperature by 2% and increase wind speed by 0.2m / s (Pandiangan, Huda, & Rambe, 2013). Based on computational fluid dynamics (CFD) simulations, it is known that the use of a rooftop turbine ventilator can make air quality better and increase comfort with the exhaust rate by the turbine ventilator (Lien & Ahmed, 2002).
There are several previous studies related to turbine ventilators as a design improvement for temperature conditions in the workplace. Several studies have carried out engineering control using turbine ventilators to improve the thermal comfort of workers in mosquito repellent manufacturing plants (Huda & Pandiangan, 2012;Pandiangan, Huda, & Rambe, 2013). The use of turbine ventilators is also proposed to improve air circulation at the garment company workstations, which are still not in ergonomic conditions (Rasyid, Surachman, & Sugiono, 2016). The use of Hybrid Turbine Ventilators (HTV) to increase the stack effect in buildings in Malaysia that has a hot and humid climate has also been done before (Rifa, Al-Obaidi, & Rahman, 2014). A study also tried to determine the effect of the number and angle of vertical blades on the cyclone turbine ventilator on the thermal comfort of the room (Karim, Qiram, & Sartika, 2018). In addition to the use of a turbine ventilator, an automatic system has also been developed to control the temperature and humidity of the fruit storage room automatically so that it can delay the fruit-ripening rate for 21 days (Amin & Adha, 2017).
Based on this description, it is necessary to analyze and improve the working temperature in the production room of CV. Grafika Dua Tujuh. One of the improvements in working temperature is engineering control, namely the installation of a turbine ventilator or exhaust fan.

Working Temperature Assessment Procedure
This research was conducted in the production room of CV. Grafika Dua Tujuh. Data observed and retrieved based on the thermal conditions in the room. Thermal measurements were performed using a 4 in 1 envirometer, anemometer, and area heat stress monitor. The 4 in 1 envirometer is used to measure air temperature and humidity. Anemometer is used to measure wind speed. The area heat stress monitor is used to measure the WBGT. Based on SNI-16-7061-2004 measurements are made according to the area of the room then the coordinate grid of measurements is determined, and based on ASHRAE, measurements are made with gradient levels, namely 0.1m, 1.1m, and 1.7m. Measurements were taken for 3 working days from 09.00 to 16.00 WIB with 1-hour intervals.

Workload Assessment Procedure
Assessment of workforce activity at each workstation is calculated based on the level of calorie energy demand according to SNI 7269: 2009 so that the level of workload experienced by workers in the production room of CV Grafika Dua Tujuh can be obtained. Assessment of workload based on the level of calorie needs according to energy expenditure according to SNI 7269: 2009 as shown in Table 1. The results of the work climate measurement are then compared with the results of the workload assessment following Permenaker No. 13 of 2011 regarding the WBGT standard value. The permissible WBGT index threshold values are shown in Table 2.

Working Temperature Improvement Procedure
Heat exposure is handled by engineering controls so that it can increase the thermal comfort of workers. The steps taken were started from determining the criteria for the room and how to improve thermal comfort according to the criteria. Then an analysis of the optimal amount and the placement of the thermal comfort improvement facility was carried out. The next step is to analyze the feasibility of investing in additional facilities at CV. Grafika Dua Tujuh.

Air Temperature
Average temperature conditions in the production room of CV. Grafika Dua Tujuh can be categorized as high. The average temperature at setting station is 32.67 ° C, editor station is 32.83 ° C, CTP station is 29.67 ° C, content printing station is 33.32 ° C, cover printing station is 33.25 ° C, key printing station is 33.24 ° C, UV varnish station is 33.04 ° C, binding station is 34.28 ° C, stitching station is 1 33.80 ° C, and mixed station is 32.83 ° C. The average temperature value at the ten work stations is above the threshold limit value (TLV) according to the Indonesian Ministry of Health Number 1405 / MENKES / SK / XI / 2002 where the specified temperature is 18-28 ° C. The high-temperature value is influenced by the lack of air circulation in the room because the production room has only small ventilation. In addition, the roof is made of zinc so that it is exposed to high heat exposure because zinc is a medium for conducting heat or usually called as a conductor.

Wet-Bulb Temperature, Dry-Bulb Temperature, Globe Thermometer Temperature, and WBGT
WBGT measurements are carried out at a height of 1.1 meters from the ground floor of the room using the Heat Stress Area which can directly measure the value of the four measurement quantities. The position of the instrument when measuring is in the middle of the measured production room.
The results of measurements of wet-bulb temperature, dry-bulb temperature, globe thermometer temperature, and WBGT in the production room of CV. Grafika Dua Tujuh is in Table 3 below. The WBGT that has been obtained from the measurement results using the Area Heat Stress Monitor will be compared with the WBGT value calculated manually. The following is the WBGT calculation in the production room of CV. Grafika Dua Tujuh. The WBGT calculation is as follows: WBGT = 0, 7 0,3 The WBGT measurement results are then compared with the WBGT calculation in Table 4.
The total workload calculation is carried out at each production workstation. The results of calculating the total workload based on the level of calorie needs are shown in Table 6. The results of the work climate measurement are then compared with the results of the workload assessment at each workstation in the production room of CV. Grafika Dua Tujuh which can be seen in Table 7. Stitching Does not meet the standard 10 Packing, Cutting, Manual binding Does not meet the standard

Improvement of Working Temperature
The work temperature improvement is carried out only at the content printing workstation because it has a heavy workload category and does not comply with the Permenaker No. 13 of 2011 regarding the WBGT standard. The improvement of working temperature at the content printing workstation is engineering control, namely the installation of a turbine ventilator and exhaust fan. Turbine ventilators and exhaust fans have the same function, which is to suck in hot air and dust and facilitate air circulation so that it will prevent hot air from being trapped in the building.
The content printing workstation is an open space. There is a fan located near the printing machine number 2, and 15 vents measuring 30cm x 10cm located above the right and left walls. Even though there are ventilations in the production room, the workers still feel uncomfortable because the room is hot. After taking measurements, the air temperature near the engine is higher than the air temperature far from the engine, which has a difference of 1.2 ° C to 2 ° C. The content printing workstation does not allow enough air circulation because this workstation is adjacent to another building, moreover the content printing workstation has a roof made of zinc. The discussion is carried out by calculating the required number of turbine ventilators and exhaust fans and the appropriate placement. The content printing workstation plan can be seen in Figure 1. One of the improvements in thermal conditions at the content printing workstation is engineering control, namely the installation of a turbine ventilator or exhaust fan. If the turbine used is a Cyclon Turbine Ventilator Type L-45 with a suction capacity of 42.39 m 3 and a circulation time of 10 minutes, the required number of turbine ventilators is: The exhaust fans can be placed on the side of the wall adjacent to the engine at a height of 4.5 m from under the wall. Exhaust fans design can be seen in Figure 3.

Figure 3. Improvement of Content Printing Workstation Using the Exhaust Fan
Discomfort conditions at the content printing workstation are due to improper handling of heat exposure. The improvements made are maximizing the use of turbine ventilator or exhaust fan. These improvements will reduce air temperatures and increase wind speed. Thus, workers will feel comfortable so that it will increase company productivity.

CONCLUSION
The conclusion of this research is the average working temperature in the production room of CV. Grafika Dua Tujuh, namely setting station is 32.67 ° C, editor station is 32.83 ° C, CTP station is 29.67 ° C, content printing station is 33.32 ° C, cover printing station is 33.25 ° C, key printing station is 33.24 ° C, UV varnish station is 33.04 ° C, binding station is 34.28 ° C, stitching station is 1 33.80 ° C, and mixed station is 32.83 ° C. The average temperature is above the standard by the Indonesian Ministry of Health, which is 18 ° C-28 ° C. Proposal for improvement made at content printing station that has a heavy workload. Efforts to control heat pressure that are expected to be implemented in CV Grafika Dua Tujuh is by engineering control, namely the addition of turbine ventilators and exhaust fans. To determine the effect of the physical environment on work productivity, it is recommended that the physical environment variables should be added with the variables of noise, lighting, vibration, room color, and work area arrangement.