DAIICHI KOGYO Co., Ltd

Insect Control Measures

What Are Insect Control Measures?

Our insect control measures are carried out by using our ventilation equipment technology to prevent insects from entering from outside by controlling the pressure of the controlled rooms.
These measures have been adopted in such factories as paper mills and food factories, and they play a role in improving product quality.

Insect Control Measures

Reasons Why Insects Enter Rooms

Insects enter rooms because they are attracted to certain odors and temperatures.
In cases where the flow rate of supply air and exhaust air is unbalanced or in cases where the air supply occurs naturally through the outer walls’ vents, the room pressure can become lower than the outside, and a large amount of air flows through the outside entrance or through the building’s crevices. Entering the room together with this air are insects, which may lead to contamination of products.

Procedures for Controlling Insects

Insects instinctively interpret any detection of wind as a sign they are being attacked and respond by flying downwind. It is therefore necessary to calculate airflow to ensure that the flow of air always travels in the direction from the building to outside and design a method of providing rooms with pressure higher than outside (positive pressure room).

  1. Ensure the factory conforms to class 1 ventilation (supply and exhaust by machine) and to balance supply air volume and exhaust air volume to create a positive pressure room.
  2. Ensure the exterior walls and finishing materials inside the building have no cracks and crevices in order to provide an airtight structure.
  3. The air to be supplied to the controlled room must be passed through a filter that supports the level of cleanliness required.
  4. A front room is established at the entrances for both goods and people, and both front and rear doors are never permitted to be opened at the same time. Airflow balance is established to ensure the flow of air always travels from the controlled room to the front room, and from the front room to the outside.
  5. It is necessary that any insects that do appear are exterminated.

Installed System

By creating positive pressure inside the factory, we ensure the airflow direction is always going to the outside, thereby preventing insects from flying in and breaching the room.
Below we show with illustrations some examples of the kinds of systems we have actually installed.

Examples of Insect Control System Construction

  • Location: Gifu Prefecture
  • Building: Paper mill. Steel-frame building 2 floors (existing building)
  • Building size: Floor area of first floor 1,850 square meters. Floor area of second floor 920 square meters.

Overview of Construction

Insect control ventilation equipment construction was carried out on the first floor and part of the second floor of the existing paper mill.

On the First Floor

Air conditioning systems and blowers were used to feed outside air through ducts to the controlled room in order to create a positive pressure environment. The system measures the pressure, and excess air is exhausted to the outside using fine-control differential pressure damper.
* A steam coil is built into the air conditioner so that heating can be performed by generated steam in the future.

On the Second Floor

Using a blower, the system feeds outside air through ducts to the controlled room in order to create a positive pressure environment. The system measures the pressure and excess air is exhausted to the outside air with a fine-control differential pressure damper.
Each outside air intake location on the first and second floors has a filter unit attached to it.

  • First floor air supply flowrate: 54,400 cubic meters/hour
  • Second floor air supply flowrate: 5,000 cubic meters/hour

Effect

After converting the controlled room to a positive pressure environment, the number of breaching insects decreased markedly.
Before construction, the number of insects caught was 4,130 individuals and after construction, this number decreased to 324 individuals (92.15% decrease; data provided by the customer).

Equipment used

  • Air conditioner: 1 unit
  • Blower: 2 units
  • Fine-control differential pressure damper: 20 units
  • Filter unit: 3 units

Related Information

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