Anti-static bags belong to composite bags, and the main raw materials are PE, CPP, BOPP, NY, PET and other common raw materials:
I. Main properties of biaxially oriented polypropylene (BOPP):
1, colorless, high transparency.
2. Excellent tensile strength, impact strength and rigidity.
3. Excellent cold and heat resistance: -40~ 120℃.
4. The performance of isolating water vapor is very good.
5. Poor oxygen barrier.
6. It is usually used as a printing material for highly transparent multifunctional bags and composite bags.
7. Ordinary BOPP does not have heat sealability.
Main uses of BOPP film: BOPP is the most commonly used packaging surface material, especially when the packaging requirements are not very high. Because of its superior moisture-proof performance, it is suitable for moisture-absorbing food packaging such as biscuits and snacks. Density: 0.9 1 g/cm3.
Second, the main properties of unstretched polypropylene (CPP):
1. Excellent gloss and transparency, but slightly worse than BOPP.
2. It has good heat sealing performance.
3. The strength and stiffness are worse than BOPP and higher than PE film.
4. It has heat sealing performance and is often used as the heat sealing film of composite bags. The heat sealing temperature is higher than PE.
5. Moisture-proof performance is better than PE film with the same thickness.
6. Special CPP has good heat resistance and is suitable for cooking and high temperature sterilization.
7. Not resistant to low temperature, brittle fracture is easy to occur at low temperature.
Main uses of cast polypropylene: As a heat sealing layer, besides PE extrusion, CPP is the most commonly used film, especially when used in retort pouch. When sterilizing at high temperature, heat resistance and temperature-resistant punching strength of 120℃ are required, and attention should be paid to the selection of grades. Density: 0.9 1 g/cm3
3. Polyethylene (PE) is a kind of plastic (LDPE, HDPE, LLDPE) with the largest output and the most application in packaging materials. Features are as follows:
Main performance:
1, the film is slightly white, transparent body and soft. The strength is lower than HDPE, and the impact strength is lower than HDPE.
2, cold and heat resistance, good thermal stability, thick film can be sterilized in hot water at 90℃, and it is easy to deform when it exceeds 90℃.
3. Good moisture resistance. Stable chemical properties, excellent drug resistance, insoluble in general solvents.
4. The air permeability is low, so it should not be stored for too long when used as antioxidant food packaging.
5. Poor grease resistance and slow product dissolution. Therefore, when packaging oily food, long-term storage will make the food contain waxy taste.
6, long-term exposure to ultraviolet light and high temperature will age, making its physical properties gradually worse.
7, excellent heat sealing performance, often used in the inner layer of plastic composite bags.
Four, the main use of PE film:
1. Food packaging: cakes, sweets, roasted seeds and nuts, candied fruit, milk powder, sugar, salt, tea, fish floss and condiments;
2. Fiber products: shirts and clothing.
3. Packaging of paper products.
Five, nylon membrane (NY) can be divided into two-way stretching (bony) and non-stretching (CNY), and it is often used in combination with other membranes.
Main performance:
1, oil resistant, organic solvent resistant, nontoxic, tasteless and colorless.
2. Good printability, tensile strength, abrasion resistance and pinprick resistance.
3, high compressive strength
4. Good oxygen barrier performance, excellent cold resistance, heat resistance and oil resistance.
5, easy to absorb moisture, high moisture permeability, weak stiffness, easy to wrinkle.
The main uses of NY membrane are: fried food, frozen food, vacuum packaging, cooking and sterilizing food and dairy products. Commonly used in frozen food packaging that needs puncture resistance.
Six, polyester film (PET)
Main performance:
1, high mechanical strength: the tensile strength is equal to PE5~ 10 times. Good rigidity and impact resistance.
2. Good heat resistance and cold resistance, stable at 240℃.
3. Good oil resistance, good tolerance, excellent acid resistance and poor alkali resistance.
4, the water vapor permeability is small, and the moisture-proof and moisture-proof performance is excellent.
5. Air tightness: the isolation ability of oxygen and moisture is relatively poor, but the fragrance retention performance of spices is excellent.
6. Good transparency and poor ultraviolet protection.
The main uses of PET film: it is often used to make retort pouch and vacuum aluminized substrate, and to package broth, frozen food, rice cake or tea.
Seven. Main characteristics of aluminum foil:
1, good insulation and shading, metallic luster and good reflectivity.
2. Good heat resistance.
3, not easy to be corroded, good barrier, moisture-proof, waterproof and airtight, leaving fragrance.
4, strong protection, so that the packaging is not infringed by bacteria, germs and bacteria.
5. High temperature ... >>
Question 2: How does aluminum foil prevent static electricity? It is an antistatic aluminum foil bag made of several materials with electromagnetic shielding function. It consists of multiple layers of materials and is usually opaque. Anti-static aluminum foil bag has the advantages of anti-static, anti-electromagnetic interference and moisture-proof. It has the characteristics of high strength, good toughness, strong rigidity, good heat and cold resistance, good environmental stress cracking and tearing resistance, and is suitable for packaging electronic products with moisture-proof requirements.
The antistatic aluminum foil bag also has the advantages of waterproof, antistatic, shockproof and dustproof, and feels comfortable, smooth and flexible. The raw material is PET/AL/PE, which has high mechanical strength and no damage, and is beneficial to recycling. It can be made into various flat pocket and envelope bags, suitable for printing of various specifications, and can also be printed in color according to customers' requirements. It can also be used for packaging and encapsulating important electrostatic sensitive devices in food, medical care and electronic products.
Question 3: How to eliminate the static electricity of FRP (a new composite material)? Polyvinyl alcohol is used as the release agent. When demoulding, use wet demoulding method [drenching the joint surface with water], and wash off the polyvinyl alcohol after demoulding.
Add a layer of mist when polishing to avoid dust flying everywhere.
Supplement: the curing workshop should be separated, demoulding and grinding should be separated from another workshop, and the humidity can be higher.
The grounding effect of formwork iron is not very great, you can try it.
Question 4: What kinds of anti-static countertops are there? 1 and composite countertops; The mesa is made of high-density composite plate, and the surface phenomenon is 2mm thick polymer material. Its characteristics: oil resistance, wear resistance, acid and alkali resistance and strong impact resistance. The four sides of the table are sealed with high-strength plastic, which is firm and practical, not easy to be damaged and fall off, and is mostly used for light and heavy work tables. 2. Multilayer board table; The countertop is made of imported hardwood and hot-pressed with high-performance waterproof and heat-resistant phenolic resin glue, which has high bonding strength, large elastic modulus and permanent corrosion resistance. Its characteristics: flat table, strong stability, high bearing capacity and good impact resistance. 3. Thin iron plate cladding; The tabletop is made of high-density composite board, and the surface is covered with 1.5mm thick iron plate. Its characteristics: good strength, impact resistance, wear resistance, long service life, mostly used for heavy-duty workbench. 4. Anti-static desktop; The desktop is made of high-density composite board, and the surface is 2mm thick anti-static rubber plate. Its characteristics: prevent and hinder the generation of static electricity when taking office. The four sides of the table are sealed with high-strength plastic, which is firm and practical and not easy to be damaged and fall off. It is mostly used in electronic or other anti-static workstations. 5, fire board table; The countertop is made of melamine fireproof board, which is characterized by lightness, beauty and wear resistance. Lightweight workbench mostly used for electronic products. 6. Thick iron plate cover; The desktop is made of high-density composite board, and the surface is tiled with 5mm thick iron plate. Its characteristics are high strength, strong impact resistance, wear resistance and long service life. It can be assembled with a vise, which is mostly used for heavy-duty workbench and maintenance platform.
Question 5: What is a composite antistatic floor? The full name of composite anti-static floor is anti-static ceramic-metal composite raised floor, with anti-static ceramic tiles as the surface layer and composite metal substrate, and the sides are generally sealed with conductive adhesive strips with a thickness of1mm. You don't need tape to seal the edges, but in that case, once you bump during installation and maintenance, it's easy to lose porcelain.
Composite antistatic floor is generally composed of four layers of materials: bottom layer, base layer and wear-resistant antistatic surface layer. Among them, the number of revolutions of wear-resistant anti-static surface determines the life of composite anti-static floor.
Composite anti-static floor is generally divided into different base materials and facing materials. The base materials are steel base, aluminum base, composite base, particleboard base (wood base), calcium sulfate base, etc.
Veneer materials include anti-static tiles, melamine (HPL), PVC, etc. In addition, there are antistatic plastic floors and antistatic network floors.
The overhead anti-static floor is mainly composed of adjustable brackets, beams and panels. The technical performance of supports, beams and panels shall meet the design requirements and current national codes.
The composite antistatic floor is assembled by brackets, beams and panels. There is a certain suspended space between the horizontal floor and the panel. It can be used for downlink wiring and air supply, and is quite practical in computer rooms with many lines, such as computer rooms and data rooms. Because of its good comprehensive performance, it is more and more favored by the market.
Question 6: What are the two kinds of static electricity? The more detailed, the better. One: Electrostatic discharge (ESD)
Second, electrostatic attraction (ESA)
The first one: electrostatic discharge
form
static discharge
The form of electrostatic discharge is related to the geometry, voltage and material of charged body. Electrostatic discharge form:
corona discharge
(1) Corona discharge: It is a partial discharge that occurs near the tip of charged body or small radius of curvature. Corona discharge may be accompanied by slight hiss and faint lavender light. Corona discharge usually has no danger of ignition.
Brush discharge and propagating brush discharge.
(2) Brush discharge and propagating brush discharge: both are multi-branch discharges with acousto-optic on the insulator surface. When the metal conductor is attached to the back of the insulator, the propagating brush discharge will appear on the front of the insulator. Multiple brush discharges or propagating brush discharges may occur on the same insulator. Brush discharge has a certain ignition risk; The ignition risk of propagating brush discharge is very high.
spark discharge
(3) Spark discharge: It is a single-channel discharge between charged bodies. Spark discharge has bright flashes and short sonic boom. It is very dangerous to catch fire.
Lightning discharge
(4) Lightning-like discharge: it is a lightning-like discharge formed by large-scale and high-density charged particles suspended in space. It is very dangerous to catch fire.
Characteristics of electrostatic discharge
Overview of characteristics
The most common reason for electrostatic electrification is the contact and separation of two materials. The most common electrostatic electrification phenomenon is the friction electrification phenomenon between solids. In addition, there are stripping charging, cracking charging, electrolytic charging, piezoelectric charging, thermoelectric charging, induction charging, adsorption charging and jet charging. Electrostatic electrification-discharge of objects generally has the characteristics of high potential, strong electric field and broadband electromagnetic interference.
chart
The second one: electrostatic attraction
On the contrary, there is interaction between charged bodies, and the force is directly proportional to the product of their charged amount and inversely proportional to the square of the distance between them. This interaction is electrostatic attraction.
computing formula
Gravitational field caused by universal gravitation, f = GMM/(r 2)
G is a constant, Mm indicates the mass of two objects, m indicates that the large object is the object that causes the gravitational field, m usually indicates the object in the gravitational field, and r indicates the distance between them.
Electrostatic field caused by electrostatic charge, f = kqq/(r 2).
K constant, Qq is the charge of two objects, R distance (the specific relationship is similar to the gravitational field above).
The magnetic field is generated by a magnet, and the charge moving in the magnetic field is subjected to van der Waals force (intermolecular force).
All three are fields, which can be superimposed and regarded as composite fields.
Question 7: What are the main components of antistatic artificial stone? Will it cause cancer? Anti-static synthetic stone, also known as high-temperature nanocomposites, is a new type of material, also known as synthetic stone or reinforced fiber plastic abroad. High temperature nanocomposites are eager for glass fiber compounds. They don't cause cancer.
Question 8: Is the enamel material antistatic? In fact, it is a composite material in which inorganic glassy materials are fused on the base metal and firmly combined with the metal.
Whether it is antistatic or not can only be said that it has certain insulation. The outer insulated inner conductor is easy to be electrically broken down.
You use the starting point on the lighter to electrify and find that the arc hits the enamel directly. It shows that its anti-electric ability is still limited, and it can't compare with insulators. But stronger than pure metal.
Question 9: What material is used for antistatic floor? Antistatic floor is also called dissipative electrostatic floor. These materials can be divided into the following categories:
Straight floor
Anti-static floors are generally divided into anti-static tiles, PVC anti-static floors and anti-static floors.
1, antistatic tile
In the process of firing ceramic tiles, antistatic powder is added for physical modification, so the antistatic performance is very stable, and the resistance value is between 106 ~ 109 ohm, which is convenient for construction and can be laid by ordinary Plaster workers.
anti static floor
Adding aluminum foil or copper foil under the floor can better enhance the conductivity.
Its advantage is stable antistatic performance. The floor is a national patented product, which is a green building material with high wear resistance (0. 1g/ 1000 rpm), aging resistance, long service life (more than 30 years), Class A fire protection and low water absorption (Question 10: What is an antistatic material to greet friends?
Antistatic material.
Here are some examples.
1, foam material was prepared by molding method, and antistatic agent was added to polyolefin.
Adding antistatic agent to polyolefin, foaming material was prepared by die pressing.
give an oral account
2
The antistatic mechanism and application of polymer antistatic agent are introduced.
The characteristics, action mechanism and application status of polymer permanent antistatic agent are introduced.
Provided by jukuu
three
Their antistatic properties were measured by triboelectrification method, voltage method and charge surface density method.
The antistatic properties were tested by friction voltage method and charge surface density method.
give an oral account
four
We also customize and sell antistatic and conductive reels.
We can also customize and sell antistatic and conductive tray products according to the size.
wqrc
five
The system is made of antistatic conductive materials.
The whole system is made of antistatic conductive materials.
give an oral account
six
Therefore, many commercially available antistatic finishing agents not only make fabrics hydrophilic, but also contain electrolytes.
Therefore, many commercial antistatic finishing processes not only make fabrics hydrophilic, but also use electrolytes.
give an oral account
seven
ESD antistatic function ensures the safety of high-performance chips.
ESD anti-static function ensures the safety of high-performance chips.
testmart
eight
There are all kinds of>& gt.