The era of the hottest OPP bottle is coming

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The era of OPP bottles is coming (Part 2)

three production methods

in order to solve the problem of low OPP output, bekum America and CCC transformed their pet molding machine for manufacturing OPP bottles. They believe that among the PET bottle series equipment, the linear heating SBM system with eight cavities and below is the most cost-effective equipment for producing medium capacity OPP bottles

ccc company has designed a series of patented linear heating SBM equipment for OPP bottles. The company's enviroclear (which can also produce PET) molding machine is manufactured by a Chinese partner company, with two to eight cavity types. Among them, the four cavity molding machine produces 900 bottles per cavity per hour, and the production speed of the company's next-generation equipment is expected to increase to 1100 bottles/hour. At present, CCC can provide bottle blanks and SBM equipment (made in China) with up to 32 cavities, and the price is 40% to 80% lower than that of locally made equipment. In addition, the company has machines for manufacturing open bottles

ccc believes that optimizing the preform design is very critical. The preform designed by the company is 50% more stretchable than pet, and the transparency is greatly improved

The OPP bottle series products produced by CCC company mainly include open bottles of salad condiments, pickles and dry powder, as well as extruded containers for shampoo, mouthwash and drugs. In order to improve the top load and weekly strength, CCC injected nitrogen into the opening space of OPP bottle after filling

bekum America has improved the design of its heated SBM molding machine (such as double chamber rbu-225), so that it can switch between PET bottles and PP bottles. A few years ago, bekum America specially designed the first all electric heating SBM machine for pp. the rated production capacity of this six chamber SB-6 machine is 7200 bottles/hour, which is only 15% slower than the pet machine with the same number of cavities

PTI company proposed another manufacturing method. The company believes that the best way to fully reflect the price advantage of OPP bottles is to produce at a constant rate of 1000 bottles per cavity per hour on a high-speed, rotary heated SBM machine. At this speed, PTI simulated the process of producing 24g OPP bottles on the Sidel machine on the computer, and estimated that the unit cost of this OPP bottle was 10 cents lower than that of PET bottle. According to the previous production rate of OPP bottles (600 bottles per cavity per hour), the unit cost will exceed that of PET bottles

strict process control can improve the output of OPP bottles. In production, insufficient blowing within the temperature range of OPP will lead to insufficient stretching and low transparency of bottle blank; If the processing temperature is too high, the bottle body, bottleneck and bottom will appear atomized, or the material will be unevenly distributed in the bottle wall and the bottle will become sticky, thus interfering with the downstream operation. In the past, PTI company used laboratory research and virtual prototyping software to predict the effect of adding additives to improve the heat absorption rate of PET bottle blanks. They also made models of air cooling inspection needle valve wear and water cooling to accelerate the processing of PET bottles. Now, they have successfully applied these technologies to the production of OPP bottles, making the target productivity (more than 1000 bottles per cavity per hour) feasible. PTI company uses the masterbatch rapid heating additive developed by ColorMatrix company. According to ColorMatrix, the additives that improve the heating speed of pet preforms are also applicable to OPP preforms

ExxonMobil has carried out computer simulation of OPP bottle production on a rotary heating blow molding machine. The company used the improved Sidel machine, special bottle blank design and specially developed PP resin pp9505e1. The haze of this 30-mfr material is 6% when it is 1mm thick, and the elastic modulus is 166000psi. The haze of the OPP bottle is less than 2%

ExxonMobil company made 750cc PET bottles and OPP bottles with the same shape and weight, and simulated the molding process of OPP bottle blank in 48 chamber film mold with computer, and then compared the two. The comparison results show that OPP preforms are wider and longer than PET Preforms, the composite drawing ratio is low, and the axial and radial drawing balance is excellent; The wall thickness of OPP bottle blank is thin, which can improve the heating and cooling rate; Opp bottle blanks fall faster than PET bottles in free fall mode, and the cycle of using manipulator to take and place the two kinds of bottle blanks is basically the same. It can be seen that the molding cycle of OPP bottles is shorter than that of PET bottles. On the Sidel testing machine, OPP bottles can be blown with maximum capacity; Opp bottles have the same sensory characteristics as PET bottles; The top load strength of OPP bottles is slightly lower than that of PET bottles with the same weight, but it can fully meet the requirements of many application fields; The drop impact strength of OPP bottles is lower than that of PET bottles, but for OPP bottles for single-layer refrigeration, its strength is sufficient

SIPA company said that its "one and a half step" integrated isbm molding machine is an effective method to produce OPP bottles. This equipment first injects the bottle blank, and then sends the bottle blank to the blow molding process through robots and linear conveyor belts. The fx20/80e machine designed by SIPA for OPP bottles has a production capacity of 30000 bottles/hour. It adopts a special screw and a redesigned heating oven. The OPP bottle produced by fx20/80e has excellent transparency and evenly distributed bottle wall thickness. SIPA said that fx20/80e can complete the convenient loading and unloading and rapid heating of OPP bottle blanks, and the OPP bottles produced can be used for water, milk or other hot filling purposes

asb-650ex3, a one-step isbm system specially designed by Nissei ASB for OPP bottles, is mainly used in the field that requires water vapor barrier or must be able to support the project, focusing on the research, development and implementation of new sustainable raw material autoclave temperature (such as medical packaging). The system includes a special screw, a pretreatment station for processing bottle blanks, and independent valves and timers for controlling the blowing action of each mold cavity. Opp barrier bottle arrival

PPPI company (Pechiney plastics packaging Inc., now a subsidiary of Alcan company) in Chicago can produce three-layer pp/evoh/pp directional barrier bottles after improving the Sidel rotary heating SBM molding machine. PPPI company modified the surface layer of PP, so that PP can be firmly attached to EVOH barrier layer without adhesive layer. Their gamma clear transparent bottles are available in 16 oz and 26 oz. the 26 oz bottle is a wide mouth bottle (63mm) with a temperature resistance of 205 ℃, and the price is lower than that of glass and pet

the goal of PPPI is to replace glass bottles in application fields requiring long storage time, good oxygen barrier and high hot filling temperature with OPP barrier bottles. In the 26 ounce container market of 800million bottles/year, the price of OPP bottles is lower than that of glass bottles. The company predicts that by 2005, OPP bottles will be industrialized. In the design of PET bottles, vacuum discs and grippers are used, which can only be hot filled at 180 ℃ at most. However, OPP bottles can withstand higher hot filling temperature (195 ℃) without these special designs, which increases the labeling space and improves the sales advantage. Therefore, PPPI believes that their pp/evoh bottles have great potential in the sauce, apple juice and other hot filling packaging markets

Kortec is evaluating the potential of multi-layer OPP containers. The company believes that multi-layer OPP containers only supplement rather than replace barrier PET containers. They predict that heat-resistant OPP containers will enter the packaging field of hot canned food, coexisting with glass containers and metal cans. In addition, OPP barrier bottle can replace stainless steel tank by its transparent characteristics

another way to manufacture OPP barrier containers is to use the existing pet bottle coating technology (plasma, flame or corona treatment technology). PPG industries claims that its epoxy amine film bairocade can improve the oxygen barrier of OPP bottles at a cost similar to that of coated PET. Therefore, bairocade is expected to achieve industrial use on OPP bottles. By changing the formula and thickness of the coating, aircraft design requires that the aluminum material of aircraft body structure should not only have high strength, but also have sufficient fracture toughness and good fatigue resistance, reaching or even exceeding the same oxygen barrier as PET containers

CCC has developed a patented technology of oxygen barrier immersion coating for OPP bottles. The immersion coating process is simple and flexible, which is very suitable for OPP bottles with small capacity, non-circular spheres and special shapes. At present, CCC company has launched a set of coating device to process 3600 ~ 5600 OPP bottles every year

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