Collapsible container

Liquid color are shipped in various sizes of containers. Small samples are sent in 1-qt to 1-gal collapsible containers (Hedpack). More common containers are 5-gal pails, 30-gal drums, and 55-gal drums. For really long runs, reusable totes are available. All-steel or all-aluminum totes are widely used, and totes that consist of a polyethylene tank supported by a cage of steel rod are becoming more popular. Totes are particularly efficient for large-volume colors, often black or white. The tote can be returned and refilled with the same color, reducing the chance of cross-contamination. 

British Standard BS EN ISO 3826-1 2003 Plastic collapsible containers for human blood and blood components requires that... 

Extractable di-(2-ethylhexyl) phthalate, DOP, is determined in plastic collapsible containers for human blood and blood components. A sample of plastic is extracted with ethanol-water mixture having a density of 0.937 at 37°C for 60 min. The resultant solution is measured for absorbance at 272 nm and concentration of plasticizer determined from calibration curve. 

Specification for a collapsible container for human blood and blood components contains chemical limit on extractable di-(2-ethylhexyl) phthalate, which should not be larger than 10 mg/100 ml of ethanol water mixtnre having density of 0.937. ... 

ISO 3826 1993 Plastics collapsible containers for human blood and blood components ISO 4574 1978 Plastics — PVC resins for general use — Determination of hot plasticizer absorption ISO 4575 1985 Plastics — Polyvinyl chloride pastes — Determination of apparent viscosity using the Severs rheometer... 

The bellows of collapsible containers overlap and fold to retain their folded condition without external assistance, thus providing a self-latching feature. This latching is the result of bringing together under pressure two adjacent conical sections of unequal proportions and different angulations to the bottle axis. On a more technical analytical... 

Consider collapsible containers to save space and freight costs, if they are to be used also as returnable shipping containers. 

Collapsible Container. This type of container is constructed to permit the sides to fold down when not in use. The obvious advantage of this design, saving space, must be weighed against its shorter life and smaller payload capacity. 

Collapsible Rigid Container. This is a heavy-duty version of the collapsible container. It is nearly equal in strength to the heavy-duty rigid type, but the higher original cost must be compared with savings on return freight costs. 

Sometimes a star explodes in a supernova cast mg debris into interstellar space This debris includes the elements formed during the life of the star and these elements find their way into new stars formed when a cloud of matter collapses in on itself Our own sun is believed to be a second generation star one formed not only from hydrogen and helium but containing the elements formed in earlier stars as well... 

Things appear to have taken a strange turn We started out discussing the free volume and have ended up with an equation which contains no volume at all More specifically, we set out to examine the rate at which the free volume collapses at Tg. A final development of Eq. (4.63) will produce the desired result. 

As with polyesters, the amidation reaction of acid chlorides may be carried out in solution because of the enhanced reactivity of acid chlorides compared with carboxylic acids. A technique known as interfacial polymerization has been employed for the formation of polyamides and other step-growth polymers, including polyesters, polyurethanes, and polycarbonates. In this method the polymerization is carried out at the interface between two immiscible solutions, one of which contains one of the dissolved reactants, while the second monomer is dissolved in the other. Figure 5.7 shows a polyamide film forming at the interface between an aqueous solution of a diamine layered on a solution of a diacid chloride in an organic solvent. In this form interfacial polymerization is part of the standard repertoire of chemical demonstrations. It is sometimes called the nylon rope trick because of the filament of nylon produced by withdrawing the collapsed film. 

Sepro Conta.iner, The Sepro container consists of a collapsible plastic bag fitted into a standard three-piece, tin-plated container such as a 202 X 214, 202 x 406, or 202 x 509 can. The product is placed within the bag, and the propellant is added through the bottom of the container, which is fitted with a one-way valve. There is no limitation on the viscosity of the product but compatibiUty with the plastic bag must be considered. A free-dowing hquid can be dispensed either as a stream or a fine spray, depending on the type of valve employed. A viscous material is often dispensed as a stream. This system has been used for caulking compounds, postfoaming gels, and depilatories. 

Low (2—5 wt %) antimony, low (2—5 wt %) tin lead alloys are used for automobde body solder. Special lead—antimony alloys containing 1—4 wt % antimony are used for wheel-balancing weights, battery cable clamps, collapsible tubes, and highly machined isotope pots. 

Perhaps the most firmly based report for the formation of an azete involves flash pyrolysis of tris(dimethylamino)triazine (303). This gave a red pyrolysate believed to contain the highly stabilized azete (304) on the basis of spectroscopic data. The putative azete decomposed only slowly at room temperature, but all attempts to trap it failed (73AG(E)847). Flash pyrolysis of other 1,2,3-triazines gives only acetylenes and nitriles and it is not possible to tell whether these are formed by direct <,2-l-<,2-l-<,2 fragmentation of the triazine or by prior extrusion of nitrogen and collapse to an azete (81JCR(S)162). 

Fouling Industrial streams may contain condensable or reactive components which may coat, solvate, fill the free volume, or react with the membrane. Gases compressed by an oil-lubricated compressor may contain oil, or may be at the water dew point. Materials that will coat or harm the membrane must be removed before the gas is treated. Most membranes require removal of compressor oil. The extremely permeable poly(trimethylsilylpropyne) may not become a practical membrane because it loses its permeability rapidly. Part of the problem is pore collapse, but it seems extremely sensitive to contamination even by diffusion pump oil and gaskets [Robeson, op. cit., (1994)]. 

For effluent streams consisting of only liquid and vapor, hole diameters ranging from Vh to V2. in are recommended. Larger hole diameters (up to 2 in) may be required if the blowdown stream contains solids (polymers and/or catalyst). However, the violently collapsing vapor bubbles create a water hammer effect which increases in severity with hole size. 

We shall now examine material selection for a pressure vessel able to contain a gas at pressure p, first minimising the weight, and then the cost. We shall seek a design that will not fail by plastic collapse (i.e. general yield). But we must be cautious structures can also fail by fast fracture, by fatigue, and by corrosion superimposed on these other modes of failure. We shall discuss these in Chapters 13, 15 and 23. Here we shall assume that plastic collapse is our only problem. 

First, the pressure vessel must be safe from plastic collapse that is, the stresses must everywhere be below general yield. Second, it must not fail by fast fracture if the largest cracks it could contain have length 2a (Fig. 16.4), then the stress intensity K CTV must everywhere be less than K. Finally, it must not fail by fatigue the slow growth of a crack to the critical size at which it runs. 

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