2015年2月11日星期三

The application of plastics PPS in the plastic products

Plastic PPS in application of plastic products PPS English names of PPS: Phenylene sulfde proportion: 1.36 grams/cubic centimeter molding shrinkage 0.7% molding temperature cent ° c. It is a super comprehensive performances of thermoplastic special engineering plastics, its prominent feature is the high temperature resistance, corrosion resistance and excellent mechanical function.
PPS is a sulfur-containing aromatic polymer, linear PPS at more than 350 ° c after crosslinked thermosetting plastic, branched-chain structure of PPS for thermoplastics.

PPS for the automotive industry accounts for around 45%, mainly for the automotive functional parts if can replace metal exhaust cylinder circular pump impeller and valve, pneumatic signal mediation and so on. Also applies Yu electronic electrical aspects, PPS for electronic electrical industrial may accounted for 30%, it for Yu environment temperature higher than 200 of high temperature electrical components; may manufacturing generator and engine Shang of points swiping, and electric swiping Bay, and started device coil, and shield cover and the leaves,; in TV Shang, may for high voltage shell and the socket, and Terminal and the Terminal plate,; in electronics industry, and manufacturing transformer, and resistance flow ring and the following the electrical of skeleton and shell body, integrated circuit carrier; using high frequency performance, manufacturing h level wound frame and fine-tuning capacitor,.

While PPS for shell, structural parts, wear-resistant parts and seal material, concrete pumps, valves, bearings, bearing supports, such as piston rings and gear machinery industry.


We also use various materials such as PEEK,ABS,PC,PEI successfully produced a variety of demanding plastic products. More about the new material application in injection molding and plastic products, please visit www.cnmoulding.com or www.chinamoldmaker.org  wish I could give you some help!

2015年2月9日星期一

Injection Molding Quality Management

Our company has ten years of experience in mold manufacturing and injection molding, injection molding products for rigorous testing to ensure product quality. Commonly used to detect divided into the following four categories:
Quality Inspection injection products are divided into: 1, 2 visual inspection, dimensional inspection products 3, 4 strength test, aging test
Visual inspection:

Appearance of the article inspection standards, criteria, the product appearance inspection standards, criteria, standard
Weld marks, dents, material flow marks, silver (gas mark), silver (gas mark), albino, crack, impurity color gloss, transparency (refractive index), transparency (refractive index), scratch marks gate processing, overflow edge (burr), words and symbols
Products dimensional inspection:
(1) The size of the test method products: production; ambient temperature; gauges; record; products: production; ambient temperature; gauges; record; judgment
(2) measuring self-tapping screw holes
(3) with the size of the test
(4) measuring the warpage of the part
(5) microscope inspection dimensions
Strength test:
Impact strength drop test bending test self-tapping screw boss creep strength and fatigue strength of thermal cycles
Aging test weathering:
Definition: the aging of the plastic occurs four reasons: ultraviolet light, heat, air, ozone and other ingredients, and other microorganisms. Ozone and other ingredients in the air, micro-organisms and the like. Aging mechanism is the use of products from the oxidation start indoor location in direct sunlight should also consider requirements for weather resistance to environmental stress cracking define environmental stress cracking conditions occur: "stress concentration" or gap "stress;" gap "; stress; technical quality of the work environment regulations medium
Technical quality of work order (a)
(A) into a product before the craft is required to confirm the quality standards, there is no product standard shall promptly notify the competent authorities and inform the scheduling technique can not be put into production. Use of raw materials must have inspection reports, qualified before use, a single laboratory should be archived.
  (B) In general, the use has been confirmed that the materials, such as pigments, can not be recognized, informs the scheduler to use. Direct contact with food products or have special requirements due technical requirements, and technical documents archived.
  (C) product inspection work should be standards-based, carry out three standards (GB, product inspection work should be standards-based, (GB, the Department of Enterprise standard), when implementing the highest standards as the basis.) Make sure the product level, shall be carried out according to the standard quality inspector. In addition to the workshop workshop director, technical director of the Factory in addition, according to technical standard product grades can be changed to any other person entitled to change the product grade or secretly altered the product grade.
Technical quality of work order (b)
(A) The inspector must be responsible for the quality of the product, the product according to classification, are stored in the specified location, according to the volume, grade storage.
(B) Where a product has more than 15% class of non-genuine, Technical Director shall immediately convene the workshop scheduling, craft, administrator and technical backbone for analysis resolved.
(C) the feed rod, waste should be broken, and new material blended use by a certain percentage, the blending ratio of the technical requirements issued by the craft, substandard arrangements for storage by the dispatcher.

(D) must be published before the craft production process of order cards and concise clear quality standards, no such technical documents, scheduling the right to refuse production.

2015年2月8日星期日

The application status of plastics in medical apparatus and instruments

The application status of plastics in medical apparatus and instruments

Medical equipment involves multiple sectors pharmaceuticals, machinery, electronics, plastics, etc., in which the rapid development of plastic medical devices. Since the 1930s, people first used synthetic polymer materials - since celluloid film is made as an artificial kidney dialysis membrane used in clinical success, polymer materials are gradually replacing traditional inorganic materials such as metals, glass, ceramics, phosphorus gray stone for the preparation of medical devices.


This is because: (a) a polymer material with good mechanical properties and chemical stability, more suitable for medical use;
(2) a rich source of polymer materials, inexpensive, disposable medical supplies for made ​​to avoid the traditional material products due to high prices and had to repeatedly use disinfection and problems caused by secondary infections;
(3) or more easily modified plastics have been good tissue compatibility, blood compatibility of products;
(4) made ​​of plastic low cost, suitable for a variety of molding methods, ease of processing into complex shapes and the development of new medical products.

Compared with ordinary plastics, medical plastics require higher:
(1) Since most toxic monomers and oligomers, so medical plastics are strictly limited to the residual of the foregoing;
(2) plastic in the polymerization process inevitably come into contact with the reactor, metal catalysts, which often contain trace metal ions, according to the medical plastics GB requirement for zinc, lead, cadmium, copper, barium, tin and other metal ions residual cases are clearly defined; resin
(3) requirements for medical plastics with high purity, narrow molecular weight distribution;
(4) plastic processing or modified in the process need to add various additives, such as the amount of plasticizer in PVC medical products often as high as 30-60%, thus requiring maximize the use of toxic chemicals, to prevent long-term use or reduce the precipitation of additives to affect product performance and treatment;

(5) In accordance with the requirements of medical plastic, often need to make products with surface hydrophilicity, anti-radiation sterilization and other functions.

The company of characteristic

The company of characteristic

The company from its inception in 1997, had more than 14 years of development history and accumulated rich a lot of experience in mold making. For the United States, Germany, Italy, Switzerland, Korea and other customers to provide quality mold making and injection molding services.
Our inexpensive form gone through more than 10 years, have also made striking achievements, but we also need to be clear is to know, rigid mold making and service model has far cannot satisfy the growing demand of the customer. If there is no change in our enterprises, enterprise development will be stagnant.
Enterprise diversification is the future of die and mold industry trends. Therefore, provides customers with mold making and injection molding, it also provides product design, rapid prototyping, and so on. Satiety  the  different need of customers.

Now we has been formed to mold manufacturing, injection molding, product design, hardware processing, supplemented the diversified company.

We are willing to provide you with the injection mold-related services, please visit www.plastic-injectionmoulding.com or www.chinamoldmaker.org for more information

Characteristics of Polyethylene

Characteristics of Polyethylene
Polyethylene is a milky white plastic, waxy and translucent surface is ideal wire and cable insulation and jacketing materials. Its main advantages are:


(1) excellent electrical properties. High insulation resistance and electric strength; over a wide frequency range, the dielectric constant ε and the dielectric loss tangent value of tgδ and substantially independent of frequency change, as the communication cable insulation materials are almost ideal one medium.
Better

(2) mechanical properties, full flexibility, and tough, resistant capacitive good.

(3) heat aging resistance, low temperature resistance, cold resistance and chemical stability.

(4) good water resistance, low moisture absorption, insulation resistance immersed in water is generally not declined.

(5) as the non-polar materials, a large gas permeability, the permeability is low-density polyethylene is the most excellent in various plastics.

(6) the proportion of light, its specific gravity less than one. LDPE is particularly prominent, about 0.92g / cm3; large low pressure polyethylene, although its density is only about 0.94g / cm3.

(7) has a good processing performance, easy-to-melt plasticizing, and difficult to break down, cooling easy molding, product geometry and structure size easy to control.

(8) with its light weight wire and cable production, use, laying convenient, easy fitting.
But there are many disadvantages of polyethylene: the softening temperature is low; contact with the flame burning and melting easy, and emit the same smell when burning paraffin; poor resistance to environmental stress cracking resistance and creep resistance, as the seabed in polyethylene cables and larger gap (especially vertical laying) when the cable insulation and sheathing materials using special attention. Wire and cable polyethylene plastic

(A) General insulated polyethylene plastic

1Only the polyethylene resin and an antioxidant composition.

(2) weather polyethylene plastic
Mainly composed of a polyethylene resin, an antioxidant, and carbon black composition. Weathering performance is good or bad depends on the particle size of the carbon black content, and dispersion.

(3) resistance to environmental stress cracking of polyethylene plastic
Melt index of 0.3 or less, not too wide molecular weight distribution polyethylene; irradiation or chemical cross-linking of the polyethylene for.

(4) high-voltage insulated with polyethylene plastic
Polyethylene plastic for high voltage cable insulation highly pure, still need to add a voltage stabilizer and using a special extrusion machine, avoid pores produce to inhibit resin discharge, increase polyethylene arc resistance, corrosion resistance and electrical corona .

(5) semi-conductive polyethylene plastic
Semi-conductive polyethylene plastic is added conductive carbon black in polyethylene obtained, the general should be fine particle size carbon black, high structure.

(6) Thermoplastic LSZH polyolefin cable material

This kind of cable is a polyethylene resin-based material, adding quality and efficient halogen-free non-toxic flame retardants, smoke suppressants, heat stabilizers, fungicides, additives, coloring agents modified by mixing, plasticizing , granulating

2015年2月5日星期四

PC plastic injection molding processing technology is introduced

PC known as polycarbonate, because of its excellent mechanical properties, commonly known as bulletproof glue. PC has high mechanical strength, wide range of temperature, electric insulation performance is good, but the arc performance unchanged), good dimensional stability and transparency, etc. In the casing electrician products, all structure, electronic products are widely used. PC modified product is more, there are usually added glass fiber (GF), mineral filler (M), chemical flame retardants, and other plastic, etc. PC's liquidity is poorer, the processing temperature is higher, so the many levels of modified materials processing need special plasticizing injection structure.



1, the processing of plastic PC bibulous rate is larger, must be preheated before processing dry, pure PC 120 drying, modified PC generally with 110 drying temperature more than 4 hours. The drying time can't more than 10 hours. Generally available to the vacant extrusion method to determine whether a dry enough. The use of reworked material ratio can reach 20%. In some cases, may use reworked material, 100% of the actual quantity depends on product quality requirements. Reworked material cannot mix different masterbatch, otherwise it will seriously damage the nature of the finished product.

2, selection of injection molding machine now PC products due to cost and other reasons, the use of modified materials, especially the electric products, still must increase the fireproof performance, in the flame retardant PC and other plastic molding, alloy products is mix well to the requirement of plastic injection machine plasticizing system, corrosion resistance, the conventional plasticizing screw hard, when the choose and buy, be sure to explain in advance. Ramada company has a dedicated PC screw for customers to choose.
3, mold and gate design Common mold temperature is 80-100 , and glass fiber is 100-130 , small products available needle gate, the gate depth should be the thickest part of 70%, other gate are circular and rectangular. Gate the bigger the better, in order to reduce the plastic shear caused by excessive defects. The depth of the vent should be less than 0.03 0.06 mm, port as far as possible short and round. Draft is generally about 30 '- 1 °.

4, melt temperature can be used for empty injections to determine processing temperature. General PC processing temperature is 270-270 , some modification or low molecular weight PC for 230-230 . 5, see more with the fast injection speed rate of injection molding, such as electrical switch parts. Common for slow and rapid prototyping.


6, back pressure around 10 bar back pressure, without gas lines and color mixture can be appropriately reduced. 7, residence time, At high temperatures for a long time, material qualitative, cut out CO2, become yellow. Don't use LDPE, POM, ABS or PA cleaning barrel. Application of PS. 8, matters needing attention Some modified PC, due to too many times (lower molecular weight) or ingredients mixing unevenly, easy generation dark brown liquid.

CNMOULDING the 6S Quality Management System

"6S management" 5S expansion by Japanese companies come, is a modern facility effective site management concepts and methods, its role is: to improve the efficiency, quality assurance, clean and orderly work environment, prevention, and ensure safety. Nature is an execution 6S corporate culture, emphasizing the culture, not afraid of difficulties discipline, think to do, to do a good job, work as a basis for the implementation of 6S, can provide high-quality management platform for other management activities.




6S content
Finishing (SEIRI) - the area of ​​any article into the workplace and does not need to be necessary, in addition it is necessary to leave the other are eliminated. Objective: To make room, space utilization, prevent misuse, create refreshing workplace.
Rectification (SEITON) - necessary to stay with the position of the items placed in accordance with the provisions, and placed them neatly labeled. Objective: Workplace glance, eliminating time looking for items, neat working environment, eliminating excessive backlog items.
Cleaning (SEISO) - the visible and invisible in the workplace where cleaned, keep the workplace clean and beautiful environment. Objective: stable quality, reduce industrial injuries.
Clean (SEIKETSU) - maintain above 3S results.
Literacy (SHITSUKE) - each member to develop good habits, and follow the rules work, actively cultivate the spirit (also known as habitual). Objective: To cultivate good habits, to comply with the rules of the staff, and create a members spirit.
Security (SECURITY) - emphasis on full safety education, safety first at all times have the concept of preventive measures. Objective: To establish a safe production environment, all work should be based on the premise of safety.
Because the Japanese are beginning the Roman alphabet "S", and therefore referred to as the "6S".
6S relationship
Associated with each other, organize, straighten, sweep is the specific content; clean is institutionalized and standardized; cleaning refers to the bypass? Keep 3S level, literacy is a habit, discipline, rules, rigorous; safety is the foundation of respect for life, to prevent illegal. Finishing: distinction and do not want to, just the right amount left to live, do not clean out, saving space; rectification: the things you want to be positioned in accordance with regulations, as neatly and accurately identify, save time; cleaning: the workplace remove dirt and prevent the occurrence of dirt to keep the workplace clean, equipment inspection and maintenance to ensure the quality and efficiency of the technology; clean: 3S will work standardization and institutionalization, and maintain results, perseverance; literacy: Everyone acting in accordance with the provisions to develop good habits, the pursuit of the highest realm. Safety: Do not illegal, respect for life.
6S management implementation principles:
(A) efficiency: set-location is a prerequisite to improve work efficiency;
(2) holders of property: humane, global compliance and maintain;
(3) appearance: as a product - as culture - the conquest of the customer base. Management philosophy to adapt to the scene scenes show people uncomfortable, moved.
6S management of the essence:
(1) Full participation: chairman - frontline staff, all departments: production, technology, line pipe, finance, logistics;
(2) the whole process: the whole product development - the abolition of the life cycle
Everyone keep - improve - keep - Management Activities
(3) full efficiency: overall efficiency, challenge the work of the limit.
Only a starting point not the end.
The benefits of the implementation of 6S
(A) enhance the corporate image - neat and clean work environment, to attract customers and boost confidence;
(2) reduce waste: staff entrance exhibits area, the time taken sieve, space debris misplacing, nowhere else to put.
(3) improve the efficiency: good environment, mood, placed in an orderly, time-saving, reducing handling operations.
(4) Quality assurance: things seriously rigorous, eliminate sloppy, reliable quality.
(5) Security: channel flow, wide and bright, serious and responsible person, less accidents.
(6) increase the life of equipment: cleaning, inspection, maintenance, maintenance;
(7) to reduce costs: reduce leaking, reduce round-trip transportation;
(8) delivery standards: clear, obvious anomalies of timely adjustment operations.

6S implementation steps:
(1) Decision - swearing;
(2) Organization - File "learning", the Selection Committee, the implementation of office, the implementation team was established prior to the teams at all levels to work on Wednesday reported that the implementation of the list to do.
(3) the formulation of policies, objectives --6S policy is now standardized on-site materials, improve the overall quality, the need for signage, hanging in the workshop;
"6S management" extended 5S comes from Japanese companies, is a modern facility effective site management concepts and methods, and other well-known headhunter headhunting was adopted flames. Its role is: to improve the efficiency, quality assurance, clean and orderly work environment, prevention, and ensure safety.
1. Finishing (SEIRI) - the area of ​​any article into the workplace and does not need to be necessary, in addition it is necessary to leave the other are eliminated.
Objective: To make room, space utilization, prevent misuse, create refreshing workplace.
2. Rectification (SEITON) - necessary to stay with the position of the items placed in accordance with the provisions, and placed them neatly labeled.
Objective: Workplace glance, eliminating time looking for items, neat working environment, eliminating excessive backlog items.
3. Cleaning (SEISO) - the visible and invisible in the workplace where cleaned, keep the workplace clean and beautiful environment.
Objective: stable quality, reduce industrial injuries.
4. Clean (SEIKETSU) - maintain above 3S results.
5. Literacy (SHITSUKE) - each member to develop good habits, and follow the rules work, actively cultivate the spirit (also known as habitual).
Objective: To cultivate good habits, to comply with the rules of the staff, and create a members spirit.
6. Security (SECURITY) - emphasis on full safety education, safety first at all times have the concept of preventive measures.
Objective: To establish a safe production environment, all work should be based on the premise of safety.
ISO9000 Quality Management System Certification Program


2015年2月4日星期三

Mold quality control points

Mold quality control points

A, the rationality of the mould design
Structure design is reasonable is the key to the quality of a complete set of mold, mold production cycle, so for the mold structure design and manufacturing process must attach great importance to, be sure to do reasonable as far as possible, to get twice the result with half the effort. Thus design it necessary to pay attention to the following:

1. When the mould structure design should pay attention to how to make the production process, easy to do. Plastic pieces of the size of some key parts (such as dimension, high precision size or contract) in areas such as the uneven tolerance reserve the direction of the steel material selection, so that need change after test module and have a chance of correction, and avoid possible welding such as remedies.

2. Mold design for putting small and more or mold eccentric structure, mould should be under the guide pillar structure. The launch of the hole for multiple rib ventilation window can decorate a few first, but pay attention to the position of the reserved (avoid water), so that can increase when necessary to launch holes or increase the rib Angle so that the mold. Strict in plastic parts shape and can't feed, try to adopt the way of diving or putting diving feed.

3. The mould design is completed, need comprehensive review all drawing size especially mutual need to fit the size and type bit size accurate, can only be a formal processing drawings, all employees participating in the mold production to each process control according to the requirements of size. Second, the quality control of mold material
We manufacture I mold are small batch or single production, processing process is complex, manufacturing cycle is long, the mould parts of raw materials for processing using even affected the quality of the mould of a complete set of, according to the present production condition, from the mold production necessary
The aspects of mould materials for quality control.
1. Should choose fixed, with stable quality assurance materials suppliers. For key mold parts material, required to provide product certification; When necessary for material composition test, inspection quality inspection, etc.

2. The material into the factory inspection work earnestly. Requirements:
1) material chemical composition is correct. (use spark discriminant);
2) good quality of materials and forging surface smooth, no obvious crack folding, scarring, slag inclusion, open side after texture
Even, no cracks, porosity, slag inclusion and other surface; 3) delivery hardness appropriate size (HRC26-32) right;

4) die set to check the datum, the parting surface precision, A and B plate material quality, and provide mould frame factory inspection requirements
The report.


3. The production process at any time to monitor quality of materials, die set, found that the problem is detailed record and feedback management personnel handling.

Injection of new technology introduction

Injection of new technology introduction

1. Nitrogen gas-assisted injection
      Nitrogen gas-assisted injection system, this advanced systems and technology, is to control the system directly injected into the mold cavity via a segmented plasticized plastic wrap nitrogen pressure on the plastic parts caused by internal expansion hollow, but still keep the shape of the product surface intact. Application of nitrogen-assisted injection molding technology,Has the following advantages: 1) plastic materials savings, savings rates can be as high as 30%.

2) shorten the production cycle time.
3) reducing the clamping pressure injection molding machine can be as high as 30%.
4) improve the working life of the injection molding machine.
5) reducing the pressure in the mold cavity, the mold of loss reduction and improving the working life of the die.
6) for certain plastic products, mold can be aluminum metal.
7) Reduce stress, product warpage problems and improve the density of the plastic parts.
8) to solve the problem and eliminate the product surface has shrunk.
9) to simplify the cumbersome design products. 10) Reduce consumption of injection molding machines.
11) lower investment cost injection molding machine and mold development.
  12) reduce the production cost.


Nitrogen gas-assisted injection molding technology can be applied to a variety of plastic products, such as televisions or stereo housing, automotive plastic products, furniture, bathroom, kitchenware, household appliances and daily necessities, various types of plastic boxes and toys. Nitrogen gas-assisted injection molding technology in the injection molding industry must be subject to a wide range of applications