Common sense questions about plastic molds that you have to know

Common knowledge of plastic molds - extrusion blow molding newmaker extrusion blow molding is a method of manufacturing hollow thermoplastic parts. Widely populated objects are bottles, barrels, cans, boxes and all containers for food, beverages, cosmetics, pharmaceuticals and daily necessities. Large blow molded containers are commonly used in the packaging of chemical products, lubricants and bulk materials. Other blow molded products include balls, bellows and toys. For the automotive industry, fuel tanks, car shock absorbers, seat backs, center brackets, and armrest and headrest covers are blow molded. For machinery and furniture manufacturing, blow molded parts have outer casings, door frames, frames, pots or boxes that have an open side.


polymer


The most common blown plastic extruded material is high density polyethylene. Other polyolefins are also often processed by blow molding. Depending on the application, styrenic polymers, polyvinyl chloride, polyester, polyurethane, polycarbonate and other thermoplastics can also be used for blow molding.


Recently, engineering plastics are widely accepted in the automotive industry. Material selection is based on mechanical strength, weatherability, electrical properties, optical properties, and other properties.


Process


3/4 of the blow molded articles are manufactured by extrusion blow molding. The extrusion process forces the material through a hole or die to make the product.


The extrusion blow molding process consists of 5 steps: 1. Plastic type embryo (extrusion of hollow plastic tube); 2. Close the flap mold on the parison, clamp the mold and cut the parison; 3. To the mold cavity Cold wall inflation type, adjust the opening and maintain a certain pressure during cooling, open the mold, write down the blown parts; 5. Trim the flash to get the finished product.


Extrusion


Polymer blending is defined as a process in which the polymer or polymer system is graded by melt mixing. The compounding process ranges from the addition of a single additive to a variety of additive treatments, polymer alloys and reactive blending. It is estimated that one-third of the US polymer production will be mixed. Blends can be tailored to the performance requirements of the ultimate application. The compounded product has miscellaneous properties such as high gloss and excellent impact strength, or precision moldability and good stiffness.


The blended polymer is typically pelletized for further processing. However, the industry is increasingly interested in combining compounding with the next step, such as profile extrusion, which avoids heating the polymer again.
mixing


Various types of melt mixing equipment are used, from roll mills and batch mixers to single and twin screw extruders. Continuous compounding (extrusion) is the most common equipment, because it provides a consistent quality product and reduces maneuverability. There are two types of blending:


Distributed mixed material remarriage ingredients can be evenly distributed without the use of high shear stress. Such mixtures are known as extended or laminar mixing.


Dispersive mixing, also known as intensive mixing, in which high shear stress is applied to destroy the cohesive solids. For example, when the additive mass is broken, the actual particle size becomes smaller.


Compounding operations often require two types of mixing in one process.

Automatic Sliding Door

Automatic Sliding Doors can either be a single door sliding in one direction or bi-parting doors where each door leaf slides in the opposite direction. They are often used in grocery stores, entrances to shopping malls, hospitals and other applications where you want to provide your customers a hands free, safe and easy access to your building.

Hospitals

Airports

Retail centers

Pharmacies

Hotels

Grocery stores

Hardware stores

Sporting goods stores

And more


In addition, one of the biggest benefits of automatic doors is energy savings. Since these doors only open when someone comes in or out of your building, it prevents the loss of energy when a door may otherwise be left open for a long time.

Hongfa will only dispatch highly trained CE Certified inspector/technicians to inspect, repair, service or replace automatic doors. This ensures we provide the most efficient and safest door repair for your business.

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Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfhighspeeddoor.com