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Water treatment equipment of water plant

Ultrafiltration technology is a pressure-driven membrane filtration technology. Under the action of pressure, water and low molecular substances can pass through the ultrafiltration membrane, while particles, colloids and macromolecular substances are retained. The removal principle of ultrafiltration is primarily size exclusion (mechanical filtration), although particles or membranes with charge and surface chemistry may affect purification efficiency. The pore size range of ultrafiltration is about 1000 to 500,000 Daltons, which is larger than that of nanofiltration (200 to 1000 Daltons). The materials of ultrafiltration membranes are mainly polymers such as polysulfone or polyamide. According to specific application requirements, ultrafiltration membranes can be made into sheets, hollow fibers or cut into discs. In many practical applications, a small piece of ultrafiltration membrane can be quickly blocked by filtering impurities and cause a rapid drop in the filtration flow rate. Therefore, ultrafiltration membranes are usually made into large filtration areas, and the filtration direction is tangential to the membrane surface to minimize the possibility of membrane fouling, such as a large sheet (several square feet) of ultrafiltration membranes spirally wound in the center Rolled membrane elements made on tubes, or hollow fiber ultrafiltration membrane elements containing many fine ultrafiltration membrane fibers.

The role of ultrafiltration in water purification process

Ultrafiltration effectively removes colloids, proteins, bacteria, pyrogens (eg, gram-negative bacterial endotoxins), and other organics with a molecular weight larger than the membrane pore size. Ultrafiltration can be used as reverse osmosis pretreatment or terminal filtration of deionized water. When first-grade water is required, it is particularly important to minimize the precipitation of raw material ions in the ultrafiltration membrane and reduce the dead angle of the water flow to prevent bacterial and organic pollution. In this case, the hollow fiber ultrafiltration membrane can be used as an ideal ultrapure water filter element. The hollow fiber ultrafiltration membrane element used in the ultrapure water system is encapsulated in a high-purity plastic container with low ions and organic matter dissolution. The deionized water of 18.2MΩ.cm enters the ultrafiltration container and contacts the outer wall of the hollow fiber membrane for filtration. Entering the inside of the membrane, the filtered water is collected at a high speed and flows out as product water, thereby minimizing the impact of precipitates and pollutants on water quality. Due to the continuous purification of water and the concentration of solutes, the ultrafiltration membrane may be fouled and blocked. In order to ensure the flow rate of the produced water and the purity of the water quality, it is necessary to periodically perform pressure flushing on the membrane surface of the concentrated water side of the ultrafiltration membrane.The filtration efficiency of an ultrafiltration membrane can be expressed as its log reduction value (LRV) as follows: Log=[contaminant content in feed water]/[contaminant content in produced water} Evaluating the endotoxin removal efficiency of hollow fiber ultrafiltration depends on the endotoxin content in the feed water range and LRV value. The endotoxin removal rate LRV of the hollow fiber ultrafiltration membrane was 3.7 and 6.6, respectively. Measuring feed and product water contaminants to ensure final product water quality is extremely important in practical applications. A complete ultrafiltration unit must ensure correct working parameters and pass quality tests, including direct working tests and air pressure leak tests. Ultrafiltration deionized water is used for biological applications that are highly sensitive to bacteria, proteins, metal ions, or dissolved organic matter. With continuous filtration, the build-up of contaminants can negatively impact water quality and experimental results. Chemical disinfection is an effective method to destroy bacteria and organic pollutants in ultrafiltration membranes. However, regular routine disinfection can cause the resistivity of ultrapure water to drop due to the high ionic concentration of the disinfectant. The well-designed ultrafiltration can effectively clean the ion residue after disinfection, make the water quickly restore the best resistivity and ensure that the organic matter is effectively removed.

Reagent grade sodium hydroxide has been shown to be an effective cleaning agent with the following benefits.

Low-clean ultrafiltration membranes are sterilized without the need for hand-prepared sanitizers. In some applications, terminal ultrafiltration units are an effective method of treating small amounts of water. This ultrafiltration unit provides efficient filtration while reducing maintenance and water consumption.

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There are all kinds of products on the market. In addition to distinguishing from the barcode, what other factors can we distinguish? Of course the most important thing is the label of the product. So why do products have to be labeled? What exactly do labels do?

The reason for labeling

The barcode of a product represents each product, while the label represents a kind of product. First of all, labeling a product not only allows customers to have a general understanding of the product in appearance, but also can quickly get information such as product usage from the label text. A good label can also make customers have a deep memory of a certain product.

Secondly, the product label carries important information such as manufacturer information and product ingredients, so it is obviously so important to label the product.

What are the functions of labels?

1. Labeling identifies the product

Label helps to identify the product and brand. It popularizes the product and its brand name.    

2. Labeling grades the product

Label helps to express grade of the product. For example, wheat can be express with the grades such as 1, 2, 3, 4. Label becomes useful to grade any product according to its quality.

3. Labeling describes the product

Label gives introduction of the product, describes and expresses its grade. Information and instructions about- who manufactured the product, when and where it was manufactured, how many ingredients have been used in it, how to use the product, how to keep the product safe, etc. are given on the label. This becomes helpful to the customers.

4. Labeling promotes the product

Label helps to promote the product. Customers’ attention is drawn by attractive and fascinating graphs, figures or marks. This motivates the customers to buy the product. Label plays and important role in sales and distribution as it makes the customers take buying decision.

5. Labeling protects the customers

Label protects the customers. As maximum selling price, quantity, quality etc. are mentioned on the label, the customers are protected from the possible malpractice of middlemen.

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Injection mold is a tool for producing plastic products. To meet the needs of molding parts, we need to pay attention to some matters when choosing injection molds and put forward corresponding requirements.

1. High corrosion resistance Many resins and additives have a corrosive effect on the surface of the cavity. This corrosion causes the metal on the surface of the cavity to corrode, peel off, deteriorate the surface condition, and deteriorate the quality of the plastic parts. Therefore, it is best to use corrosion-resistant steel or chrome-plated or cymbal-nickel treatment on the surface of the cavity.

2. Good wear resistance The gloss and precision of the surface of injection molded parts are directly related to the wear resistance of the surface of the injection mold cavity, especially when glass fibers, inorganic fillers, and certain pigments are added to some plastics, they Together with the plastic melt, it flows at a high speed in the runner and the mold cavity, and the friction on the surface of the cavity is very large. If the material is not wear-resistant, it will soon wear out and damage the quality of the plastic parts.

3. Good dimensional stability During injection molding, the temperature of the injection mold cavity should reach above 300 ℃. For this reason, it is best to choose tool steel (heat-treated steel) that has been properly tempered. Otherwise, it will cause changes in the microstructure of the material, resulting in changes in the size of the injection mold.

4. Easy to process Most of the mold parts are made of metal materials, and some structural shapes are very complex. To shorten the production cycle and improve efficiency, the mold materials are required to be easy to process into the shape and precision required by the drawings.

5. Good polishing performance Injection plastic parts usually require a good gloss and surface state, so the roughness of the cavity surface is required to be very small. In this way, the surface of the cavity must be surface processed, such as polishing, grinding, etc. Therefore, the selected steel should not contain rough impurities and pores.

6. Less affected by heat treatment To improve the hardness and wear resistance, the injection mold is generally subjected to heat treatment, but this treatment should make the size change very small. Therefore, it is best to use pre-hardened steel that can be machined.

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Our main products include water treatment system, mineral water filling machine, labeling machine, packing machine, CSD production line, juice production line, 5 gallon water production line, PET bottle blowing machine, injection molding machine, and so on.

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Injection Molds Classification or types of mold injection very depend on what we need to make the plastic parts， because every part has a specific and unique design. when designing molds we must see the influencing factors, like geometry, number of cavities, ejection principle, plastic material and shape of parts. Below we will explain the mold classification with a few most seen types of injection molding molds.

(1) Single parting surface injection mold

When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic parts, which is called a single parting surface mold, also known as a double-plate mold. It is the simplest and most basic form of injection mold. It can be designed as a single cavity injection mold or a multi-cavity injection mold according to needs. It is the most widely used injection mold.

(2) Double parting surface injection mold

The double parting surface injection mold has two parting surfaces. Compared with the single parting surface injection mold, the double parting surface injection mold adds a partially movable intermediate plate (also called the movable gate plate, There are gates, runners and other parts and components required for the fixed mold), so it is also called a three-plate (moving template, intermediate plate, fixed template) injection mold;

It is often used for single-cavity or multi-cavity injection molds with point gate feeding. When the mold is opened, the intermediate plate is separated from the fixed platen by a certain distance on the guide column of the fixed mold, so that it can be taken out between the two plates. Pouring system condensate. The double-parting surface injection mold has a complex structure, high manufacturing cost, and difficult parts processing. It is generally not used for the molding of large or extra-large plastic products.

(3) Injection mold with side parting and core pulling mechanism

When the plastic part has side holes or undercuts, it is necessary to use a core or slider that can move laterally. After injection molding, the movable mold first moves down a certain distance, and then the inclined section of the curved pin fixed on the fixed plate forces the slider to move outward, and at the same time, the push rod of the demoulding mechanism pushes the push plate to make the plastic part form itself. Take off the core.

(4) Injection mold with movable molding parts

Due to some special structures of plastic parts, the injection mold is required to be equipped with movable molding parts, such as movable punches, movable concave molds, movable inserts, and movable threaded cores or rings, etc., which can be combined with the plastic parts during demolding. They are removed from the mold together and then separated from the plastic part.

(5) Automatic unthreading injection mold

For threaded plastic parts, when automatic demolding is required, a rotatable threaded core or ring can be set on the mold, and the mold opening action or the rotation mechanism of the injection molding machine, or a special transmission device can be used to drive the thread. The core or threaded ring rotates, thereby dislodging the part.

(6) No runner injection mold

The runners injection mold refers to the method of adiabatic heating of the runner to keep the plastic between the nozzle and the cavity of the injection molding machine in a molten state, so that there is no gating system congealing when the mold is opened and the plastic parts are taken out. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.

(7) Right-angle injection mold

Right-angle injection molds are only suitable for angle injection molding machines. Different from other injection molds, the feeding direction of this type of mold is perpendicular to the opening and closing direction during molding. Its main flow channel is opened on both sides of the moving and fixed mold parting surfaces, and its cross-sectional area is usually unchanged, which is different from other injection molding machine molds. The end of the main flow channel is used to prevent the injection molding machine. The wear and deformation of the nozzle and the inlet end of the main flow channel can be replaced by a replaceable flow channel insert.

(8) Injection mold with ejection mechanism on the fixed mold

In most injection molds, the demolding device is installed on the side of the movable mold, which is conducive to the work of the ejector device in the mold opening and closing system of the injection molding machine. In actual production, because some plastic parts are limited by the shape, it is better to leave the plastic parts on the side of the fixed mold for molding. To make the plastic parts come out of the mold, it is necessary to set the mold release on the side of the fixed mold. mechanism.

Do you need injection molding?

Learning about the different types of injection molding can help you a lot in terms of making decisions about part production. Experts in the molding industry can equip you with resources on how you can maximize each type to fulfill your design needs. For more information, please do not hesitate to contact us. 

It is dangerous to make mistakes when installing a shrink wrapping machine. So be sure to pay attention when installing a shrink wrapping machine. Heat shrink packaging machine is one of the more advanced packaging methods in the current market. It uses shrink film to wrap the product or package outside. After heating, the shrink film wraps the product or package tightly, fully displaying the appearance of the item, improving the product’s displayability, and increasing the aesthetics and sense of value. At the same time, the packaged items can be sealed, moisture-proof, anti-pollution, and protect the goods from external shocks. The role of heat shrink packaging machines is very important, and it has become indispensable shrink machine equipment in society.

1. The heat shrink packaging machine and the winding machine consume a lot of power, so the power of the input power must be greater than the nominal power on the nameplate of the shrink machine, otherwise it is easy to burn the lines or electrical components.

2. Like the baler, the machine must be grounded reliably to protect personal safety.

3. Each machine is shipped with a cable for connecting to the power supply, and the lead part of the terminal has the identification symbol of the power supply, which must be connected correctly. The illegal operation may lead to electric shock.

4. When the specified voltage of the machine is a three-phase 380V power supply, the zero line must be input at the same time, that is, the standard three-phase four-wire system other packaging equipment is also like a vacuum packaging machine. Otherwise, the machine can not work normally, and it is easy to burn the internal electrical components.

5. The machine must be installed horizontally, otherwise, the service life of the electric heating tube will be shortened. For machines that are conveyed by mesh belts, the inclined installation will cause the conveyor belt to be off-center.

6. When the machine is used continuously for more than three months, the temperature-resistant wires in the shrinking chamber should be checked and replaced as appropriate according to their aging degree.

7. When the machine is working, the operator’s palm and other parts are not allowed to contact the operating parts of the machine, especially the temperature inside the shrink chamber is extremely high, which is easy to burn.

8. After the packaging work is completed, the heating switch should be turned off first, and the conveying motor and the fan motor should continue to run for about 10 minutes, and then the entire power supply should be cut off.

For more information about heat shrink packaging machines, please do not hesitate to contact us directly. We are happy to help you.