Most of the slatted flooring systems are made of PP material, here below are some advantages that why people always choose PP to make plastic slats …

One of the major benefits of Polypropylene is that it can be manufactured (either through CNC or injection molding, thermoforming, or crimping) into a living hinge. Living hinges are extremely thin pieces of plastic that bend without breaking (even over extreme ranges of motion nearing 360 degrees). They are not particularly useful for structural applications like holding up a heavy door but are exceptionally useful for non load-bearing applications such as the lid on a bottle of ketchup or shampoo. Polypropylene is uniquely adept for living hinges because it does not break when repeatedly bent. One of the other advantages is that polypropylene can be CNC machined to include a living hinge which allows for faster prototype development and is less expensive than other prototyping methods. Creative Mechanisms is unique in our ability to machine living hinges from a single piece of polypropylene.

Another advantage of Polypropylene is that it can be easily copolymerized (essentially combined into a composite plastic) with other polymers like polyethylene. Copolymerization changes the material properties significantly, allowing for more robust engineering applications than are possible with pure polypropylene (more of a commodity plastic on its own).

The characteristics mentioned above and below mean that polypropylene is used in a variety of applications: dishwasher safe plates, trays, cups, etc, opaque to-go containers, and many toys.

Some of the most significant properties of polypropylene are:

Chemical Resistance: Diluted bases and acids don’t react readily with polypropylene, which makes it a good choice for containers of such liquids, such as cleaning agents, first-aid products, and more.  

Elasticity and Toughness: Polypropylene will act with elasticity over a certain range of deflection (like all materials), but it will also experience plastic deformation early on in the deformation process, so it is generally considered a "tough" material. Toughness is an engineering term which is defined as a material's ability to deform (plastically, not elastically) without breaking..

Fatigue Resistance: Polypropylene retains its shape after a lot of torsion, bending, and/or flexing. This property is especially valuable for making living hinges.

Insulation: polypropylene has a very high resistance to electricity and is very useful for electronic components.

Transmissivity: Although Polypropylene can be made transparent, it is normally produced to be naturally opaque in color. Polypropylene can be used for applications where some transfer of light is important or where it is of aesthetic value. If high transmissivity is desired then plastics like Acrylic or Polycarbonate are better choices.

     (1) Preparations before transportation The eggs should be packaged before they are shipped. It is best to use hard plastic film lamination to package the egg tray, and put it in a plastic egg box. When loading eggs, the eggs should be placed upright with the blunt end facing down, and each box should be filled to prevent breakage.

     (2) Transportation tools The tools for transporting hatching eggs should be fast, stable, safe, protected from the sun and rain, and strictly prevent shocks. Best to use a private car.

     (3) During transportation, it should not be violently bumped during operation, so as not to cause the eggshell or egg yolk membrane to rupture due to strong vibration, and damage the eggs. When loading and unloading, handle with care. Eggs that have been transported for a long time should be unpacked in time after arriving at the destination, take out the eggs, remove the broken eggs, put them on a plate and let them sit for 48 hours before hatching, and never store them.

For transporting eggs, it is best to pack them in special egg cartons. For example, using pressed egg trays, put 30 eggs on each egg tray, 6 egg trays on the left and right, a total of 360 eggs in one box. If there is no pressure type egg tray, there should be a fixed number of thick paper partitions in the box to separate each egg and layer of eggs, and fill with fillers (such as grass clippings, etc.). If there is no special egg box, wooden boxes, cardboard boxes or baskets can also be used, but the eggs should be separated and filled with clean shredded paper or straw between eggs and layers. When loading eggs, place the blunt end upright, because the longitudinal axis of the egg is resistant to pressure and is not easy to break. Vehicles and boats to be transported should be clean and hygienic, ventilated, protected from rain and sun, and should not be shaken during transportation. Airplanes are the best choice for long-distance transportation, which not only saves time, but also reduces vibration. When transporting eggs in winter, pay attention to heat preservation and antifreeze. After the eggs arrive at the destination, the package should be opened and inspected in time, the damaged eggs should be removed, and the eggs should be placed in the human egg tray and re-sterilized before hatching.

In the construction of chicken houses, the configuration of air inlets in many chicken houses is not calculated according to the ventilation amount required by the number of chickens, but is estimated according to the length of the chicken house, 3 meters or 4 meters each. This unfounded empirical design will bring bad misleading to the breeding and ventilation work of farmers.

The configuration of side wall air inlets should be able to meet the needs of effective ventilation for 6-7 week old chickens at an outdoor temperature of 18-20°C. why? When the chickens are 6-7 weeks old, the most suitable temperature is 20-22 degrees Celsius. At this time, the fresh air outside is enough to reduce the temperature rise caused by the heat emitted by the chickens in the chicken house, and can ensure the chicken house. The oxygen content of the air in the house does not require excessive wind speed (or even wind speed at all).

If the configured ventilation window is not enough, on the premise of ensuring the effective ventilation, the air intake from the ventilation window will cause too much negative pressure (chickens are easy to get sick), so the air can only be entered from the wet curtain at the front of the house. , This ventilation method will form a certain wind speed in the chicken house, which will cause the chicken's body temperature to be lower than the optimal temperature required for feeding.

For example:

80*15*2.8-4.8 three-layer simple cage broiler house, raising 22,464 chickens, the most suitable negative pressure is 16-22pa, and the most suitable side wall inlet wind speed is about 4.7-5.5m/s. Reasonable environmental control equipment configuration is 5 sets of side wall 36 fans (-20pa exhaust volume 17000m3/h), 10 tail end 50 fans (-20pa exhaust volume 37000m3/h), 150mm wet pad 60㎡, ventilation 116 windows (installation size 560*270, maximum effective air inlet area 0.1㎡).

Let's assume that the chicken is 40 days old. When the outdoor temperature is below 14 degrees Celsius, the ventilation window is adopted to enter the air and the side wall fan to exhaust the air. When the outdoor temperature is between 14°C and 18°C, the ventilation window is used to enter the air and the rear fan is used to exhaust the air. When the outdoor temperature is higher than 18°C, the wet curtain inlet is used for air intake, and the rear fan is used for exhaust air (4 sets are normally open, others are temperature controlled).

If we configure only 54 air inlets according to 3 meters, what will happen? On the premise that the chicken is 40 days old:

Method 1. When the outdoor temperature is 17°C, the ventilation window is used for air intake and the rear fan is exhausted. When the ventilation window is opened to the maximum, the air inlet speed will reach 6m/s, and the negative pressure will exceed 25pa, which exceeds the maximum negative pressure of the chicken house. point. Not good for chicken growth.

Method 2. When the three tail-end 50-type fans are turned on, turn to the wet curtain inlet for air intake (such as air intake from the ventilation window, the air inlet wind speed is 5.7m/s, and the negative pressure is 20pa). At this time, the outdoor temperature should be 16 ℃, Assuming that the thermometer in the house shows 22°C, the body temperature of the birds will actually be lower due to the indoor wind speed. It is also not conducive to the growth of chickens.

In the European poultry house environmental control system design, the configuration of the side wall air inlet window can even meet the ventilation needs of the high-day-old chickens at 30 °C outdoors.