Injection blow molding the parison mold materials

  The most stringent in the injection blow molding process, the operating conditions of the parison mold to withstand the high injection pressure, Therefore, for the manufacture of the mold, we must carefully choose the right steel, which types of molded plastic and production cycle length is two a more important factor.

  For example, high density and low density polyethylene are more prone to processing, because of their low intensity, no pressure, in addition, the flash rarely. Plastics such as polycarbonates casein and other higher strength, higher molding pressure, and therefore easily lead to a bending mold parting line or sub-surface deformation. The first case, you can use a lower strength steel, the latter cases, you must use high-strength steel to resist repeated high-pressure role.

  Other important factors to consider in select mold steel mold repair and correction. From the standpoint of mold makers, metal materials processing performance is as important as it can wear the highest finish, also chrome plated to prevent adhesion of the resin and polished. Usually four metal Material: chilled cast iron, mild steel, tool steel of quenched and tempered steel and air broken fire.

  (A) chilled cast iron

  Chilled cast iron and other metal materials, sufficient to meet short-term production, but can not withstand the continuous pressure to repeated impact. In the past, polyethylene containers parison mold widespread use of chilled cast iron. Easy machining cast iron, to achieve and maintain a good finish, the larger problems of repair and correction of difficulties, because of its poor weldability. In addition, unlike other materials as easy to use, now replaced by other metals.

  (B) low carbon steel

  Easily processing of hot rolled low carbon steel, commonly used in manufacturing polyethylene mold of the secondary and higher intensity, or manufacturing of blow molding soft plastic mold. Low-carbon steel has excellent processing performance, availability, and maintain a high finish, and easy welding, repair and corrected is convenient. In the actual production, the durability equal to or slightly better than chilled cast iron.

  (C) quenched and tempered steel

  Quenched and tempered steel (Rockwell hardness of R030) is very suitable for the manufacture of polyolefin plastics (including polypropylene and other hard plastic) in the mold of low, medium intensity. Although it is not like a low-carbon steel processing, quenched and tempered steel processing or convenient it has high compressive strength and durability, sufficient to meet most production needs. It can be easier to obtain and maintain a high finish, and easily welded.

  (D) air hardening tool steel

  Air the haggard fire tool steel has many types, the most widely used in injection blow mold a household JS] Transport: Its specifications are a variety of types and sizes. It may be the most comprehensive performance of the mold material, but also the most expensive materials. Its characteristics in the hardness RolD processing, and then air quenched to at RO45 an 48. Repair or orthodontic, annealing welding process.Secondary heat treatment, the deformation is small, has needed for the production of high strength and durability, in particular, especially after heat treatment stereotypes. In addition, it prevents the deformation and failure of the mold parting line. To compensate for the polypropylene inherently easy to produce a tendency to flash, high strength steel has been widely used in the processing of polypropylene mold manufacturing.

Parison nozzle and manifold

  Parison nozzle so that the molten plastic from the manifold into each parison mold.Nozzle diameter in l ~ 4 8 mm (0.040 ~ 18 inches). A set of parison mold parison uniformflow, the aperture of the parison nozzle can be a difference of about 0.13 mm (0.005 in.).Nozzle generally heated manifold contacts to get heated, if desired, can also be used alone to resistance wire heating. The nozzles general surface of hardened steel (carbon steel) or hardness of R048 AISI tool steel.

  Injection blow molding process, molten plastic from the machine nozzle injection into themanifold. In the regular injection molding, hot runner manifold also assume this role. Blow molding used manifold device is far less than the less complex type of hot runner orisolation runner type manifold. Now use the vast majority of plastic injection blow moldingis easily machined, heat-sensitive plastic proportion of small, relatively simple manifolddesign. With the widespread use of the heat-sensitive plastic, it is necessary to designspecial manifold. The injection blow molding industry there is such a technology.

  The manifold is fitted in the type of blank die. Pipe steel mold itself from the manifold, themanifold base manifold folders and nozzle clip composition. Manifold insulated siliconsteel mold and the base manifold with glass isolation, the parison nozzle tube rear clampfastening bolts near Qi. Nozzle and the parison nozzle seat alignment is the use of theclearance in the nozzle and clamping bolt hole.

  Some manifold design into the flow of molten material is limited. So that you do not need to in order to obtain the uniform rate of the molding away to change the size of the nozzle.

Mold group and mold count

  In the actual production, generally several molds (the parison mold and blow mold) withthe upper and lower template assembly of complete sets of use. Mold opening and closing and locating alignment guide pin and bushing to move in conjunction.

  Determine a set of injection blow mold cavity number of the program consists of threesteps the first step to calculate each mold clamping force (t).

  Clamping force (t) == design parison of the projected area (inches 2X2 tons / inch 2, theabove formula 2 t / inch is used for a rough estimate of the data from the experiments oflarge t, accurate data can only be after careful analysis of the different factors of formingmaterials and the parison thickness, length and the required pressure on the molded parts can be long and thin-walled parison, it is recommended that adherence to (equal to or greater than) 2 t / inch , the value of short and the wall thickness of the parison,however, its value may be reduced to 11 to 12 tons / inch 2. Second, each moldclamping force (t) divided by the blow molding machine rated parison lock Clamping Force (ton), we can draw the number of mold.

  The second step, each mold cavity is the total width, must be the gate length and therotating head of the machine compared to before we can decide this arrangement is in line with the actual situation. Different layouts to make the mold, most factories aremarked to the largest width of the cavity.

  The third step is the last coat of the calibration container, in order to determine whetherthe container is in fact suitable for the design of the second step. If the design of the moldcan not appropriately accommodate the width of the container, the number of the mold to make a corresponding reduction.

The bottom plug and the stripper plate

  Part of the end plug used to shape the bottom of the surface or for the ejection vessel. It usually consists of two halves. Each half set in each half-mold. For polyethylene, the topfrom the mold of about 4.8 mm (3 18 6 inches) to ejection. Polypropylene, polycarbonates vinegar and other hard materials, the maximum ejection volume of 0.8 mm (1/32 in.) can be mold release. For the deep end of the container, the use ofretractable bottom plug, in order to overcome the shallow top of a high degree ofinter-title. The end of the retractable plug, can produce top rigid containers up to 19 mm(3/4 inches). This design requires a set of cylinders, pistons or spring body. Especially indemanding top out height of the bottom plug movements and mold opening and closingrelations in particular should pay attention to the design, because this time the bottomplug or container is at the same time movement.

  In general, the bottom plug and blow molding using the same metallic material.Processing requirements of the work surface is the same. The end plugs are usuallygiven to water cooling, in order to shorten the molding cycle.

  The stripper plate attached to the machine ejector is used to forming good container onthe top and labor out of the mandrel. The demoulding board engraved with a shallowgroove in diameter than forming the neck of the container is slightly larger, in order to allow the gap. The stomatal direct drilling each groove below the ejector base. Prolapseof the container after the mandrel local cooling. The stripper plate to manufacture cold rolled steel.

Things to do, and never run out of steam

  Anyone to do things the ability to bits, the key to see what your wishes. Develop things to do a bit of work habits, your work would not have to worry about.

  Excellent staff, a high sense of responsibility is not and the lattice as a standard to measure their work, they do things that always try to do, trying to do their best work. They know, work and study for the examinations, not only requires 60 minutes pass, the work must be done in place, because even a 0.01% error, but also may lead to disaster. We often see in newspapers and on the network with a substandard product, which led to the casualties of the event. This occurs, perhaps by the small error of the small staff of their own l% did not care. Wrong 1% is equivalent to the product quality is scored 0 points, quality of service is 0, the quality of work is 0.

  What is the work place? Is the thing to do what extent it must be to what extent, shred can not be careless. The work place is to do anything must be in accordance with the process handle, regardless of one sloppy. Must not only to keep on good terms, and let go of things slightly small does not do bit. Must not be tolerated in the work will never allow any form of “compounding” No company is willing to accept a work of Mama Huhu, half-hearted attitude.

  At work, everyone should “work done, and never run out of steam” attitude to work.

  Mr. Wang is an executive vice president of health care products companies in southern China, he said: “Our company and some employees at work, thought only how to do their own will not suffer as long as there is conducive to their own thing to do, while A little risk will be ‘spared’, afraid to take responsibility. preceding

  Time, our R & D program intends to develop a new product. But after several preliminary tests found that a certain degree of risk. Was nearly the end into the R & D-free failure affect the year-end performance appraisal and bonus, and may have to assume the risk of liability, will submit a T to a report, listed above, a lot of reasons obstinately to this plan was canceled. The fact that it is very worthwhile to continue to do so. “In this way, the direct damage to the interests of the enterprise. Such an irresponsible attitude will ultimately lead to the R & D staff has lost the opportunity to get more benefits they pay all their energy and financial resources, but also not able to do things wasted T bit.

  If all the things done attitude to the stringent requirements in their own words, “distracted, the number of derivative matter” phenomenon would not exist. Have such number of derivative work of employees in many businesses. At work, they did not focus all on your work in mind is not how can we work to do our best, but think of how Yi Yan in the past.Hong Wang is a chemical company’s human resources director, the work of three years, is mainly responsible for the performance management of the enterprise. Not long ago, in a friend’s suggestion, he began the stock, since the work seems to have become his “second career”. Quarter of staff performance appraisal, Wang Hung simply appraisal forms distributed to each department in charge of the hands, so that they fill out to send back as soon as possible. Examination table summarizes the end, he did not verify, will evaluate the anti-debt omitted, probably do a statistical directly to the financial officers of executive compensation. Ultimately as a result of too much error, the boss had to dismiss him.

  If a person can always set strict demands on themselves to do things been done, then he certainly is willing to endure hardship people are willing to endure hardship an important manifestation of professionalism. For a struggle in the workplace, do anything, and underachievement are taboo. A person has the mentality and determination on the first F and then will have continuous opportunities for advancement. If a person with their own work can not do a good job, how to be promoted? Ambition lofty, but the mind must be calm. The so-called immediate things to do in the future to think about, that is the truth.

  However, those who never asked to do things been done to find excuses for themselves, must in all respects.

  Deng rushed inauguration of the company provides Web site building services, and products for other companies to provide e-commerce platform. For some time, he and a small business to discuss business, but repeatedly to submit three copies of website-building framework, the other party are not satisfied. The budget is low because the other side is just a small business website building, but their demands, Deng rushed finally lost patience, reporting to the Superintendent intends to abandon the business. The director is a very caring, understanding subordinates, so Deng rushed to bring the program to see, hope to help him talk to this business. However, contrary to the Director of expectations: 3 copies of the program book is almost no difference, only the rare few column names, there are some changes. Director then asked Deng Chong: “You communicated with the customer in detail?” Deng red has long been angered, replied: “the various departments in the company are busy a large customer design, due to talk business with them we had no time to ignore this troublesome customers. Director of asked again: “that you carefully research the company’s platform needs it?” Deng Chong replied: “propaganda site generally is the framework, research director of apparently some exasperation, said: “neither research, nor to communicate with customers submitted a program proposal, and allow you to modify, but also to cope with the trouble, and replaced with your customers, you can accept? it is really outrageous! “Since you have chosen to engage in an occupation, since you have accepted the job, then you want it to do the best, you must be responsible for it in the end, this is not only related to your personal qualities, it is the workplace human essential professionalism. Anyone has things to do bits, the key is that you will. Develop things to do a bit of work habits, your work would not have to worry about. In fact, the only things been done, and never run out of steam, you can have a more bright future.

Did not do bad work, only irresponsible employees

  As long as you have a sense of responsibility, able to do any work. A person to play the more the greater the responsibility, to prove his worth to the greater. Therefore, you should be proud to play.

  In this world, your any one survival rule. Human Ye Hao, the animal kingdom, only in accordance with this rule, Diao survive.

  Three wolves living in a zoo, they are a family of three. Previously, they reared by the zoo, but in order to let the wolf recovery of the wild, the zoo decided to send them to the forest, so that their natural growth. Strong and healthy wolf father was the first to be put back, zoo officials feel that its viability is certainly stronger than the other two wolves.

  Period of time, the zoo officials, let out a wolf father often ranked in zoos around the irresolute, and looks like a very hungry Russia, not the spirit. However, zoo officials did not take it back, but put out the pups.

  Zoo officials found that the release of the young wolf, wolf father almost did not come back. Only occasionally and the pups to come back several times, its body seems to be stronger than in the past, the pups look does not seem to suffer the feeling of Russia. It seems that male wolf pups care was very good, but life is also good f, so the administrators decided to brake under the bird wolf let out.

  Management after the release of the wolf, they did not come back. Later, the administrator explained the reason why they can return to the nature of life: “great public responsibility to take care of pups, although this is an instinct, it is the responsibility of this instinct to make it both a better life. Mother wolf was put out, the male wolf and wolf have a responsibility to take care of pups, male wolves and wolf mine to take care of each other three wolves to take care of each other, to be able to return to nature, to start their lives anew. “by Therefore, the responsibility is a prerequisite of survival, whether it is animal or human.

  It can be said that the responsibility to ensure the continuation of life in nature, your any can also guarantee an enterprise to survive in the competitive? Again, the answer is yes.In the opinion of management theorists, the primary responsibility for the employees of the Declaration on the job, they first have to show their work attitude in the words of this should be: with a high sense of responsibility towards work, do not slack off work, the courage to work responsible for any problems. This is to ensure that the basis of the staff work tasks can be completed.

  In fact, a person responsible is determined by the level of his achievements. When the leadership to criticize you because the work is very poor, you first have to ask not pay for the job a lot? Always use a high sense of responsibility towards the job? If a person has a sense of responsibility, it is impossible to give yourself work to submit a quiz.

  As long as you have a sense of responsibility, any T can do a good job of. A person to play the more the greater the responsibility, to prove his worth to the greater. Therefore, you should be proud to play. To prove himself the best way is to take responsibility, if you can bear up, then congratulations to you, because you will not only prove to themselves that the value of the individual, and you prove that you can do it, you are very good to the community.

  If you are a business owner, then they would have to tell your employees that you are proud of them of responsibility you are willing to assume responsibility for them, whether today or in the future, you will always do so.

  If you are an ordinary employee, it is necessary to tell your boss, you are very pleased to be able to assume responsibility for the enterprise, which will make you feel very important for enterprises, will make the boss believe you, you never slack off the heart of their own responsibility.

  In real life, whether it is the boss or employee, everyone bear his own responsibility. And no matter who is not easy to assume responsibility when. Task in itself, could be responsible for your any talent people more respect.

  Comprehend this secret wholeheartedly investment can eliminate work hard, people have mastered the key to open the door of success, you can always work in a proactive approach, even in the most humble, you can also add their own glory and fun.

  All employees want to do their job, want to increase income through their own struggle to get promoted and recognized. No one wants to accomplish nothing, because the direction of their own value, can not find work and willing to regress or leave. Everyone wants the best employees, but also want to be better employees, this is everyone’s goal.

  In fact, business is a collaborative body, chosen to use a high sense of responsibility to collaborate with each other, the entire enterprise can quickly and steadily forward.

  Direction of your appointment on the staff to the timetables emerged in the Bu-level responsibility for the employees. L level for the development of enterprises to make decisions require the employee to the specific implementation, the implementation of the success or failure of good and bad not only the relationship to the decision-making, but also to the rise and fall of the entire enterprise, employees must take responsibility. Also think he is one of the enterprise, willing and enterprises with the words of fate, then this is the bounden.

  It can be said that any employee in the enterprise of the other members of “a few responsible, as bite each other’s gear, we only closely linked, we can jointly play a role.As management experts said: “The successful organization must be on their own responsibility, mutual accountability, so as to reach prior agreement of the results.”

  If you do not assume the responsibility of a direction, the development of enterprises will be severely affected the overall responsibility of the enterprises belonging to all employees in the enterprise, regardless of your position is high or low.

  In the enterprise, each employee must do things within their own responsibilities, but this does not mean that the “fragmentation” in the direction of the clear responsibility is to tell all employees of the enterprise, and collaboration across the enterprise development needs of every employee Only in this way to ensure that the overall interests of Yan;

  Not looking for an excuse for their own good execution performance, it reflects the attitude of a person’s own post your mission. One does not find any by 11 members of T must be a dare to assume the responsibilities of employees. It can be said that the work is not looking for any excuse to carry out. Whether to do any work needed to not find any by day to perform. Do anything for us, should remember their responsibilities, no matter what kind of jobs should be responsible for their own work, this is actually responsible for their own best way.

Non-runner injection mold

  The non-runner injection mold gating system is always maintained in the molten statemolding process, plastic parts, mold release, not a Shen Tao condensate materialinjection mold and the absence of the flow channel condensate material, brought in order to save materials and energy as the mainhas been marked by a series of advantages.non-runner mold from the first patent in 1940, so far has been 50 years of history in the United States, Germany and other countries long been used in actual production. The oil crisis of the late 1960s, due to rising prices of raw materials, to promote the universalpromotion and application of the no-flow mode in Western countries and Japan, the appropriate technology has also been a great development. Today, extensive non-runnermold applications has become injection molding technology development is an importantsign.

The last three features of the reaction injection molding

  1) plastic top of the

  Reaction injection molded parts should not be used to top the peak of the staff out, usually the top of the hydraulic or pneumatic vertebral top of the plate.

  2) Shen co-head the installation of the mold

  The installation should ensure strict alignment with the sprue in the mold on the mixinghead, the joints must be sealed connection to prevent air to enter the chess cavity. Mixing head is the best on one side of the fixed mold.

  3) mode surplus technology system

  Plastic parts in order to ensure stable quality and constant molding cycle, changes in themold temperature should be controlled in the soil within 2 ℃, the steel mold, the coolingchannel and the cavity surface distance of 9 ~ 10mm, the distance between the coolingchannel to channel aperture. 5 ~ 3 times for better thermal conductivity of mold material,the channel aperture spacing can be increased appropriately.

Structural foam injection mold design points

  Structural foam injection mold the overall structure and general injection mold, the main difference is the cavity pressure is low, production volume, high surface quality requirements, the complex shape of the plastic parts must be steel mold, can be typically lower strength , cutting the mold material.

  (1) injection nozzle

  Structural foam injection molding nozzle should have the material in the fast flow and to prevent salivation nozzle exit aperture is greater than the general injection nozzle, export minimum aperture of 6.35, the export part of the cylindrical part of the length of about 8 mm is recommended not only to prevent salivation without hindering the rapid discharge opening and closing the nozzle to the nozzle end of the material should gather four atmosphere of ethylene or other high temperature insulation materials, to prevent the material to freeze.

  (2) of the sprue

  The sprue should be opened in a separate sprue bushing should have traced the mold sprue taper than the general note, design taper desirable 7 ~ 8 °, the small end diameter greater than the injection molding machine nozzle diameter 0.8 ~ 1. 0mm The maximum length should generally be no more than 60 mm, the outlet end to the transition of the shunt or transition (direct gate) in the cavity should have a greater hundred angle (radius equal to the export aperture). Thick, short and large fillet transition is designed to avoid hampering the rapid filling.

  (3) shunt

  Preferably larger than the cross section circular or trapezoidal shunt to reduce the out-of-date material flow pressure of photo loss and heat was reported missing, as far as possible to maintain the necessary flow of the filling rate, the diameter size range of 9 5 19 mm , much larger than the general injection molding, and the specific values ​​should be plastic volume and filling speed requirements and the flow length selected.

  (4) gate

  General injection mold gate in the form of principle are applicable, but the most appropriate to adopt the gate directly to the gate, side gate. Submarine Gate and other small cross-section of the gate is limited to use in the short flow path (75 mm), small plastic parts. Any occasion can be used, should be directly gate. Should not be used directly gate the best selection of the side gate. Gate section size must not be too small, too small to impede rapid filling. For example, when the shunt radial dimensions of 19 mm, the diameter of the gate section should not be less than 6, 3. Transition from the shunt to the gate, it should be R4, 5 ~ 5. The arc transition, to reduce the throttling effect of gate material. Gate length should be as short as possible, generally between 1 5 3 0 mm. Gate section size (especially the side gate thickness) increases with the thickness of the plastic parts, should generally be in the thickness of the plastic parts divisions between a joint. Design can take more Diao, section, gradually increasing the filling to the value in steps of 5 mm.

  The gate location selected, the surface is easy to produce low-pressure foaming curl-shaped texture, as far as possible the texture was parallel distribution, gate location should be selected to avoid the formation of welding seam and clip into the air in the plastic parts to use when under load parts. Structural foam injection molding materials flow length ratio is less than the general injection molding materials, the gate opened position in the thickest parts of the plastic parts, and seeks to material flow to the cavity most distant points of the flow equal length.

  (5) The exhaust of the cavity

  Structural foam injection mold exhaust is of special importance, not only because of the large air cavity volume, but also because of the blowing agent decomposition the release of large quantities of gases, these gases in addition to the retention of plastic parts internal (bulbs hole) outside, the rest of the broadcast is still exclude the cavity filling, otherwise they will be due to gas accumulation cause mobile disorders or poor plastic surface, compared with the ordinary injection mold cavity should have a greater exhaust range. Along the plastic pieces circumference, and exhaust ducts should be uniform, at intervals of 50 mm (center distance) should be set wide 12? 13 II m deep 0 07? 08 mm exhaust fold, each length of the exhaust described ? mm greater than this length, the depth increases to 0 25? 0 3 mm in one side of the cavity most distant gate relative to the exhaust groove depth should deepen. .25? 3 mm. Because of the low pressure of the cavity, the depth does not cause AIDS material. After a tryout on the depth of the exhaust ducts to be amended to obtain the effect of the filling and full of exhausted uniform density, the principle surface of a good plastic parts.

  (6) the mode of its cooling

  Structural foam injection mold evenly and controlled mold temperature, contribute to a good surface, internal stress, the foam structure is reasonable, cortex, dense and homogeneous plastic parts, but also conducive to the filling flow of materials. Since the cavity volume greater than the general injection molding process, the melt passed to the heat of the mold, the mold proper cooling of particular importance. Bored cooling channels molded into the tube cooling Road. Cooling channels from the cavity surface distance by a ship injection mold 14? 15 mm reduced to 9? Mm radial dimensions of cooling channels should be able to ensure that cooling water flow to turbulent flow.Difficult to set the cooling tank parts, also can be a large area of ​​cooling water tank.Cooling water from the bottom of the mold into the outflow from the upper, not only to increase the cooling effect, but also to exclude the possibility of wrap air bow (from the chess cavity surface of the hot spots to prevent local over-cooling, heat transfer can be used metal ( silver, copper) as the cooling plate connected to the vicinity of the cavity cooling instead of the cooling tank.

  (7) Other design considerations

  1. Gradient

  The mold cavity and core should be larger than the average injection mold slope, the minimum slope shall be not less than 5 °. Plastic parts with surface texture, texture depth of 0 02 0 03 mm, the slope should be increased 1 °. With the tendon part of the slope is less than l The °.

  2 the top of the component

  The direct use of the top peak of the staff to push the plastic parts, the ejector minimum diameter not less than 6mm diameter is too small ejector plastic parts pierced.

Structural foam injection molding method – high-pressure method

  High-pressure method is a method first used by the United Shoe Machine Corporation,the material is first premixed with the blowing agent to join the ordinary standard screwinjection molding machine, plastics and the temperature rises to the release of thefoaming gas, and then material at high pressure into the mold cavity and fill the cavity ofthe mold cavity under high pressure closed fleeting, but can be enough for cooling to form a layer of the cortex of the time (usually about 5 to 8 s), you can make the cortex to theparietal surface quickly mold parts move a certain distance from the finish. cortexformation, increasing the cavity volume, melt Dilatant. filling cavity length and the correct matching of the mold temperature under high pressure closing time for proper corticalhardness and thickness increase, and thus the subsequent parting surfaces open cavityfoam, bubbles can break the cortex has a decisive influence.