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Four variables of scientific injection molding plastics
2020-01-06Figure 1: Four variables of plastics
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Therefore, when we are judging whether an injection molding process is stable, we need to evaluate whether the four major variables of plastics are evaluated, rather than simply looking at whether the injection molding machine is stable, whether the mold is stable, and whether the material properties are stable.
Plastic temperature:
The temperature here refers to the melting temperature of the viscous flow plastic. How can the melting temperature be measured? It is impossible to read from the injection molding machine alone. How to get it please think about it. Leave a message to get the answer!
Flow rate:
That is, the flow rate of the plastic, this data can be read from the injection molding machine.
Plastic pressure:
This refers to the pressure of the plastic inside the mold, which cannot be read simply from the injection molding machine. The injection molding machine can only tell you the injection pressure, but there is a pressure loss from the barrel to the nozzle, to the runner and then to the cavity, so it needs to be calculated through experiments.
Cooling rate:
Consistency of the cooling rate can be indirectly guided by measuring the demolding temperature. -
Do you have a correct understanding of cosmetic containers?
2019-11-20If a cosmetic container manufacturer wants to get rid of the current mode of survival on low prices, it must pay attention to the construction of the design team, form its own design strength for cosmetic plastic containers, and get rid of the model of relying on models for development. This will increase the product competitiveness of cosmetic container manufacturers. While a larger investment may be required in the short term, it is well worth it in the long run. In addition, from the outside, our relevant departments should also actively guide. For example, hold a cosmetic plastic container packaging design competition, and strive to create an atmosphere for the development of cosmetic plastic containers and packaging. Furthermore, speed up the construction of the education system for plastic bottle packaging design talents. In addition, it is necessary to increase the supervision of the plagiarism of cosmetic plastic containers, and to protect the design achievements of cosmetic plastic containers and packaging should also be accelerated.
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Plastic containers must pay attention to the following issues in the design and production process: inflation, elongation, vertical load strength, container rigidity, bearing surface, screw thread, shape and outer surface and molding, temperature, pressure, etc., to ensure The mechanical properties, formability, mold structure and processing rationality of plastic containers and container use conditions. The process flow is: mixing → screw extrusion → mold clamping → blow molding → mold opening → cooling → trimming → inspection.
The value played by cosmetic plastic containers cannot be ignored. The packaging cost of cosmetic plastic containers is very low, which greatly reduces the cost of container packaging and brings tangible benefits to consumers. In addition, the plasticity of cosmetic plastic containers can meet various needs of the market. At the same time, plastic cosmetic containers have various characteristics such as drop resistance, which are difficult to replace by other packaging materials. The most important thing is the recycling rate of plastic cosmetic containers. Among them, the recycling rate of PET cosmetic plastic containers is very high, which is much higher than that of other packaging materials, glass bottles and cartons. Recycling of resources is actually a very important indicator of environmental protection. -
Four design trends you must know about cosmetic design in 2020
2019-07-22Many companies often wonder: how to predict the future trend of the cosmetics market? What are the correct research methods for cosmetics? In addition to paying attention to the dynamics of competitors, what brands often overlook is that cosmetics are not a separate product, and every year society, Changes and new things in economic, political, cultural, technological and design aspects will affect consumers' lifestyles and aesthetic preferences, and lead the trend of cosmetic design.
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After gaining insight into the complex Chinese local market, YANG DESIGN launches the "China Design Trend Report" every year to help brands and enterprises grasp the future CMF (ie Color, Material, Finish) trends. Since 2015, YANG DESIGN has put forward the macro theme of "the more virtual, the more real".
With the massive popularity of the Internet and social media in China, people are constantly looking for new experiences in the virtual world.
After people's lives are becoming more and more networked, the boredom of the virtual world has created a desire for reality. In recent years, handicraft-themed designs have emerged one after another. Traditional handicrafts with real or natural materials and full of cultural and life memories have become increasingly scarce products. According to the 2020-2021 "China Design Trend Report", YANG DESIGN proposed two trends towards the extremes of virtual and real - Hardcore Planet, IT Crisis, and also proposed two trends that tried to integrate virtual and real - Sense of Flavor, List body.
Design Trend 1
Checklist Body: Savvy High Precision Aesthetic
Now the trend is list body. Following the opinion of the leader of life aesthetics, the new middle class advocates an aesthetic that is as smart, restrained and high-precision as a shopping list.
In the sheep house "floating life" series, the designer extracted four representative traditional cup shapes and applied them to the double-layer glass. When tea or wine is poured into it, the four cup-shaped outlines appear instantly, floating lightly in mid-air, creating a sense of "floating life like a dream".
The spar-like light color bottle of Fragrance Grey Pure Cologne White Label Perfume corresponds to 5 different fragrances. The white label on the surface of the bottle is like a plastic ceramic vessel and a plaster relief, which brings people back to France in the 18th century. The concave and convex surface fixed time and transformed the sense of touch and smell.
Afu Fragrance Moisturizing Essential Oil Shower Cream applies the lines of fine brushwork, echoes the high-function product characteristics of essential oil products, reflects the refined aesthetic orientation, and enriches the visual effect with details.
The matte finish has a calming power. Neutral style, Morandi simple color matching packaging, rounded arc shell, there are nearly 700 notes about the product on the Xiaohongshu platform, and there are many keywords such as "beauty control must enter", "high-end sense", "historical beauty", etc. . YES!IC attracts young consumers to grow grass with the brand tone of simplicity, comfort and authenticity, and through the product packaging and meticulous use design.
The Fauvism Monet Garden series plant scented candles are fixed in the candles with lavender lavender, purple swallows and other plants, forming the secret garden in our minds. These visible plants add a herbarium-like ornamental quality to the product, combined with a creamy wax color, presenting a harmonious and delicate overall picture.
Design Trend 2
The wrong taste: the original style of mixing magic and reality
The second trend is wrong taste. Corresponding to the tallness of the western style, young people confidently go against the current, mixing magic and earthy reality, and dislocating the original national tide painting style.
2018 is the first year of the dynasty. Li Ning's "Enlightenment" series became a Chinese sports brand that debuted at New York Fashion Week in February 2018. Chinese, Su embroidery and retro designs in the 1990s received 1.5 billion exposures in international media, as well as more than 20 million discussions on domestic Weibo topics. Shares rose 50% in half a year.
Toffee-flavored lip balm jointly launched by Megajing and White Rabbit Toffee. In addition to the packaging style of the white rabbit toffee, the toffee stick and lip balm also try to be similar in shape and user's lip feel. And the taste of toffee, as a lip balm, is not only reasonable but also attractive. The pre-sale set off social networks and sold out in one second.
Want Want and the domestic beauty brand Natural Hall jointly launched the "Snow Cake" air cushion foundation. The air-cushion shell follows the same surface pattern as Want Want Snow Cake, and the product packaging is also highly similar to the Snow Cake packaging, which makes users have an illusion when tearing open the plastic packaging bag. Because the packaging was too terrifying, net -
What should we pay attention to when PET bottle preform injection molding?
2019-07-221. Treatment of plastics
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Because the PET macromolecules contain lipid groups and have a certain degree of hydrophilicity, the pellets are more sensitive to water at high temperatures. When the water content exceeds the limit, the molecular weight of PET decreases during processing, and the products become colored and brittle. Due to this, the material must be dried before processing. The drying temperature is 150°C for more than 4 hours, generally 170°C for 3-4 hours. The dryness of the material can be checked by the air shot method.
Generally, the proportion of recycled materials should not exceed 25%, and the recycled materials should be dried.
2. Selection of injection molding machine
Because PET has a short stable time after melting point and high melting point, it is necessary to choose an injection system with more temperature control sections and less self-friction heat generation during plasticization, and the actual weight of the product (water-containing material) should not be less than machine injection. 2/3 of the amount. Based on these requirements, Ramada has developed a series of small and medium-sized PET plasticizing systems in recent years. Clamping force is selected according to greater than 6300t/m2.
3. Mold and gate design
PET preforms are generally formed by hot runner molds. There should be a heat shield between the mold and the template of the injection molding machine. The thickness of the heat shield is about 12mm, and the heat shield must be able to withstand high pressure. The exhaust must be sufficient to avoid local overheating or fragmentation, but the depth of the exhaust port should generally not exceed 0.03mm, otherwise it is easy to produce flash.
4. Melt temperature
Can be measured by air-shot method. 270-295℃, the enhanced GF-PET can be set to 290-315℃, etc.
5. Injection speed
Generally, the injection speed should be fast, which can prevent premature solidification during injection. But too fast, the high shear rate makes the material brittle. Shots are usually completed within 4 seconds.
6. Back pressure
The lower the better, so as not to wear out. Generally not more than 100bar. Usually not needed.
7. Residence time
Do not use excessive residence times to prevent molecular weight loss. Try to avoid temperatures above 300°C. If the downtime is less than 15 minutes. It only needs to be air-shot; if it takes more than 15 minutes, it should be cleaned with viscosity PE, and the temperature of the barrel should be lowered to the PE temperature until it is turned on again.
8. Precautions
(1) The recycled material should not be too large, otherwise it is easy to "bridge" at the blanking place and affect the plasticization.
(2) If the mold temperature is not well controlled or the material temperature is not properly controlled, it is easy to produce "white fog" and opacity. The mold temperature is low and uniform, the cooling speed is fast, and the product is transparent with less crystallization. -
PET preforms everywhere
2019-07-22In recent years, social and economic development has become more and more rapid, and PET preforms are used more and more in life. Just like in this hot summer, what kind of beverages do people drink such as black tea, Sprite or cola, but you are drinking While drinking, have you ever thought about where this beverage bottle came from and how these various bottles are produced? Today, I will explain the origin of these bottles. These beverage bottles are inseparable from plastic preforms. The preforms are injection-molded products and intermediates. Beverage bottles are products processed by blow molding. The bottle material of Hehong tea is mainly made of PET. The products produced from this material are hard in texture, good in toughness, high in strength, bright in surface, environmentally friendly and non-toxic, which can be used with peace of mind.
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After makeup is used up. How to deal with empty bottles?
2019-07-221. Use an empty perfume bottle, remove the nozzle and straw, fill in half a bottle of water, and insert a flower, it is a vase with a small and fresh style of literature and art.
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2. In addition to planting flowers, small green plants, such as succulents, can also be planted in candle cups.
3. The candle cup can be used as a makeup brush holder.
4. The cream jar is used as a mask bowl bubble paper film, which is exactly one paper film, and will not waste lotion.
5. You can go to the home store to buy some diffuser rattan, a refill of diffuser essential oil, and DIY a diffuser with an empty perfume bottle.
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