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A technology of polymer and composition, applied in the field of polymer materials
Active Publication Date: 2019-11-05
COLORMATRIX HLDG
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Problems solved by technology
However, especially with thick sheets, it can be challenging to add enough material to produce the desired level of reheat while maintaining a neutral sheet color
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Embodiment 1
[0140] Example 1 - Preparation of preforms
[0141] A liquid dispersion comprising the reheat additive in a carrier vehicle was prepared and added to the throat of the injection molding machine, above the dry C93 polymer. Preforms were then prepared from the polymer using a 160-ton HUSKY injection molding machine that shot two preforms at a time. The injection molding was performed at 285°C. Each preform weighs about 35g, is cylindrical, has a length of about 105mm, has a screw cap bottom, and a side wall thickness of 3.7mm. The preform can be blown into a one-liter bottle with a petal-shaped bottom.
Embodiment 2
[0142] Example 2 - Method for evaluating reheating
[0143] Preforms for all samples / batches are stored in the same area and stored for at least 24 hours to ensure that all preforms to be measured have the same starting temperature.
[0144] The standard set goes to a Sidel SB-01 stretch blow molding machine. The machine accommodates two furnaces, each furnace contains 9×1500W+1×2000W infrared heating lamps, each furnace has 10 lamps, a total of 20 lamps.
[0145] Enter the set throughput rate, which is 1000b / p / h (the number of bottles per hour). At this rate, the preform takes about 45 seconds to run through the oven. As the preforms pass through the furnace, they are automatically turned at a constant speed so that the entire outer surface of the preform is equally exposed to the furnace lamps.
[0146] When infrared energy is supplied to each preform, the machine heating coefficient (which is a function that attempts to guide the preform reheat temperature to a preset po...
Embodiment 3
[0152] Example 3 - Comparison of Reheating and Active Addition
[0153] Preform reheat temperature versus active addition was evaluated for different stoichiometric tungsten oxide as well as commercially available titanium nitride and activated carbon (U1) materials. The result is as figure 1 shown.
[0154] refer to figure 1 , the results showed that among the evaluated tungsten samples, WO-C exhibited the best reheating versus active addition. TiN showed the best reheat performance per ppm active addition, U1 was between TiN and the best tungsten oxide.
[0155] Embodiment 4-light transmittance and the comparison of active addition amount
[0156] Evaluate the light transmittance of preforms of various materials compared with the amount of active addition, the results are as follows figure 2 shown.
[0157] Referring to Example 3, although TiN has the best reheat performance per ppm active addition, from figure 2 It can be clearly seen that it has the greatest influ...
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Abstract
A kind of article, comprise: (A) polymer composition (particularly polyester composition), this polymer composition comprises the compound of tungsten and oxygen (particularly tungsten oxide particle), and additional additive, wherein this additional The additive is selected from acetaldehyde scavengers and colorants, wherein when said polymer composition comprises an acetaldehyde scavenger, the polymer composition comprises at least 10 ppm (suitably at least 25 ppm, preferably at least 50 ppm) of said acetaldehyde scavenger agent, when the polymer composition comprises a colorant, the polymer composition comprises at least 50 ppm (suitably at least 75 ppm, preferably at least 100 ppm) of said colorant, wherein preferably said article is a preform of a container; or ( B) A sheet comprising a polymer composition (in particular a polyester, polycarbonate or polyolefin composition) comprising a compound of tungsten and oxygen (in particular tungsten oxide particles), wherein the sheet has a width of at least is 0.3m.
Description
technical field [0001] The present invention relates to polymeric materials, in particular, but not exclusively, to polyesters for use in making boards or packaging. Background technique [0002] Many plastic packages, such as those made from polyethylene terephthalate (PET) and used for beverage containers, are formed by reheat blow molding or other operations that require heat to soften the polymer. [0003] In the reheat blow molding process, a bottle preform, which is an injection molded part in the shape of a test tube, is heated above the glass transition temperature of the polyester and then positioned within the bottle mold to receive compressed air through its open end. This technique is known in the art, for example, as shown in US Patent No. 3,733,309, the contents of which are incorporated herein by reference. In a typical blow molding operation, the preform is usually reheated using radiant energy from a quartz infrared heater. [0004] In the manufacture of p...
Claims
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Application Information
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