摘要:
A process for producing polyurethane foam articles is described, in which the article is produced in the conventional manner by foaming in a mould and a release agent is applied to the mould surface prior to filling with the foam-producing components. According to the invention, a solvent-free, aqueous release agent is used in combination with one or more alkali metal and/or ammonium salts of higher fatty acids and one or more higher alcohols and the combination is applied in the hot state, preferably at a temperature of at least 75.degree. C. to the mould surface. In addition, an additive is described, which is suitable for performing the process according to the invention and contains one or more alkali metal and/or ammonium salts of higher fatty acids, one or more higher alcohols and otherwise water. The process according to the invention has the advantage that it not only avoids the use of environmentally prejudicial organic solvents, but also leads to excellent release agent films, from which the water is very largely evaporated within a very short time and namely within the very short cycle times of modern foam plants.
摘要:
A novel aqueous release agent is described, which contains as release-active subtances oil and/or wax emulsified in water as the carrier and which also contains as a further release-active substance one or more aliphatic primary, secondary and/or tertiary amines with at least one C.sub.12 -C.sub.24 alkyl radical and one or more ammonium salts as the emulsifier for the amine or amines. The invention is based on the surprising finding that hydrophobic amines (so-called fatty amines) are release-active substances. It has also surprisingly been found according to the invention that when using ammonium salts as the emulsifier, mould removal characteristics are not only impaired, but often even improved, which is not the case with conventional emulsifiers. The release agent according to the invention is particularly suitable in processes for producing polyurethane foam articles.
摘要:
A process for producing polyurethane foam articles is described, in which the article is produced in the conventional manner by foaming in a mould and a release agent is applied to the mould surface prior to filling with the foam-producing components. According to the invention, a solvent-free, aqueous release agent is used in combination with one or more alkali metal and/or ammonium salts of higher fatty acids and one or more higher alcohols and the combination is applied in the hot state, preferably at a temperature of at least 75.degree. C. to the mould surface. In addition, an additive is described, which is suitable for performing the process according to the invention and contains one or more alkali metal and/or ammonium salts of higher fatty acids, one or more higher alcohols and otherwise water. The process according to the invention has the advantage that it not only avoids the use of environmentally prejudicial organic solvents, but also leads to excellent release agent films, from which the water is very largely evaporated within a very short time and namely within the very short cycle times of modern foam plants.
摘要:
A novel aqueous release agent is described which contains as release-active substances oil, fat, wax, fatty amines and/or esters of fatty acids with fatty alcohols emulsified in water as the carrier and a specific emulsifier system, which consists of a blend of neutralized cationic quaternary ammonium compounds and anionic soaps. Surprisingly the system does not flocculate despite the opposite charge of the two emulsifier components and leads to a more flexible, elastic and pressure restistant release agent film than conventional release agents for use in processes for producing articles from polyurethane foam.
摘要:
Multilayer film which comprises a core layer (C) and two outer layers (O—, O-2) sandwiching the core layer, wherein (i) the core layer (C) comprises a bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer, (ii) one outer layer (O-1) comprising (ii-1) a low density polyethylene or (ii-2) the bimodal terpolymer as defined for the core layer (C) or (ii-3) a metallocene produced linear low density polyethylene and optionally a low density polyethylene (iii) the other outer layer (O-2) comprising (iii-1) a metallocene produced linear low density polyethylene and optionally a low density polyethylene, and its use for packaging, especially for frozen food packaging.
摘要:
Multilayer film which comprises a core layer (C) and two outer layers (O—, O-2) sandwiching the core layer, wherein (i) the core layer (C) comprises a bimodal ethylene/1-butene/C6-C12-alpha-olefin terpolymer, (ii) one outer layer (O-1) comprising (ii-1) a low density polyethylene or (ii-2) the bimodal terpolymer as defined for the core layer (C) or (ii-3) a metallocene produced linear low density polyethylene and optionally a low density polyethylene (iii) the other outer layer (O-2) comprising (iii-1) a metallocene produced linear low density polyethylene and optionally a low density polyethylene, and its use for packaging, especially for frozen food packaging.
摘要:
An apparatus for shaping plastics material pre-forms into plastics material containers with a blow mold which has at least two blow mold parts which are arranged so as to be movable with respect to each other on first and second blow mold carrier parts. A pressure pad arrangement is arranged between at least one blow mold carrier part and the blow mold part. The pressure pad arrangement is designed in such a way that the force acting between the blow mold carrier part and the blow mold part has a first force component which acts in a first pre-set region in the peripheral direction of the blow mold part and a second force component which acts in a second pre-set region in the peripheral direction of the blow mold part.
摘要:
The invention relates to a solenoid valve, particularly for controlling the brake pressure of a wheel brake of a slip-controllable hydraulic brake system of a motor vehicle. In known solenoid valves, there is a first hydraulically effective connection of an armature chamber of the solenoid valve to an outlet through the guide of a tappet in a valve insert. The first hydraulically effective connection ends in the form of a blind hole and thus does not permit flushing out gas bubbles which possibly have accumulated in the armature chamber. In order to solve this problem, the invention proposes a second hydraulically effective connection which is arranged away from the guide of the tappet, uncoupled from the first hydraulically effective connection. Thus, a closed pressure medium path is effected within a valve cartridge of the solenoid valve, the closed pressure medium path making possible an effective flushing of the armature chamber and thus a flushing out of gas bubbles.
摘要:
A stretch rod used for forming a preform into a hollow body having in its surface a plurality of raised portions and/or recesses relative to the circular cylinder shape, whereby the stretch rod tip can come into contact with the concave, rotationally symmetric inner surface of the preform at a plurality of locations which are separate from one another. Also, a method and an apparatus for forming a preform into a hollow body, which uses such a stretch rod.
摘要:
The invention relates to a magnet valve, having a valve insert and a tappet guided movably in the valve insert via a tappet guide, which tappet is braced on a valve body via a restoring spring resting a contact face of the tappet, and the restoring spring is guided radially from inside on one end by a spring guide of the tappet, the spring guide adjoining the contact face. According to the invention, centering means are present, which are disposed on the tappet in such a way that the restoring spring is centered and radially guided from inside over a substantial portion of its length.