A house wrap for a building comprises a reinforcing drainage plane layer configured to face the outside of the building; a breathable, non-perforated barrier film bonded to the drainage plane layer; and at least one insulating layer including a perforated expanded low density polyethylene foam layer, wherein in the expanded low density polyethylene layer at least 80% of the blowing agents are dissipated from closed cells within the expanded low density polyethylene layer, forming evacuated closed cells whereby a partial vacuum is formed within the closed cells of the low density polyethylene layer.

Methods of creating additive manufactured parts from expanding foam material include printing a part made of an expandable foam, using an additive manufacturing system. The foam is printed in an unexpanded state and has a closed layer at an external surface of the part. Expansion of the part is controlled, using the additive manufacturing system, wherein the expansion is performed after the printing. Methods also include modeling an expansion of a part made of an expandable foam, and printing the part made of the expandable foam, using an automated additive manufacturing system and according to the modeling. The foam is printed in an unexpanded state and has a closed layer at an external surface of the part.

A process for injection molded microcellular foaming various flexible foam compositions from biodegradable and industrially compostable bio-derived thermoplastic resins for use in, for example, footwear components, seating components, protective gear components, and watersport accessories wherein a process of manufacturing includes the steps of: producing a suitable thermoplastic biopolymer or biopolymer blend; injection molding the thermoplastic biopolymer or biopolymer blend into a suitable mold shape with inert nitrogen gas; controlling the polymer melt, pressure, temperature, and time such that a desirable flexible foam is formed; and utilizing gas counterpressure in the injection molding process to ensure the optimal foam structure with the least amount of cosmetic defects and little to no plastic skin on the outside of the foamed structure.

A device for machining a cover for a motor vehicle may have a lower mold having a sealing element and a first recess and a second recess a distance from the first recess. The sealing element is arranged in part in the first recess of the lower mold so that the element extends with respect to a surface of the lower mold. The sealing element and the second recess of the lower mold are formed so as to define a cavity in a predefined manner in cooperation with a lower face of the cover. The device further may have a counter bearing which is designed, when forming the cavity on the lower face of the cover, to exert a counter force on an upper face of the cover towards the lower mold.

Disclosed is a microwave-transmitting mould structure, comprising a first template, a second template and a mould combining unit. The mould combining unit has a first snap fit, a second snap fit and an engagement member. The first snap fit is arranged on the first template; the second snap fit is arranged on the second template; and the engagement member is snap-fit engaged between the first snap fit and the second snap fit, so that when the first template and the second template are subjected to an outward pressure, corresponding faces thereof which the engagement member can pass through respectively abut against abutting faces of the first snap fit and of the second snap fit, and thus, the first template and the second template cannot be separated from each other due to an increased pressure inside the mould.

The instant application discloses, among other things, ways to manufacture reduced density thermoplastics. A rapid foaming process which may create a polymer product by saturating thermoplastic sheet or preforms, heating, and then forming into final shape, is described. The polymer product may include an integral solid skin. This method may be utilized with any thermoplastic. The material handling, saturation methods, and end products are also described.

The invention relates to an apparatus and a method for the production of a particle foam part, wherein a mould cavity (5) is filled with foam particles, the foam particles are welded into a particle foam part and the particle foam part is cooled down in the mould. The foam particles are heated by means of a ceramic body (17) with integrated resistance heating and by the application of electromagnetic waves.

To provide a new foam molding method and injection molding machine capable of solving variation in a wall thickness and a foamed state, sensor corrosion, a complexity of sensor positioning, and the like. The above-described problem is solved by a foam molding method comprising a resin filling step of filling a mold (2), clamped by a predetermined mold clamping force (Pc), with a resin (R) at a predetermined molding injection pressure (Pi), a filling stopping step of stopping the filling of the resin (R) when, while monitoring a mold gap (Lm) of the mold (2) during the filling, a predetermined mold gap value set in advance is reached, a surface layer curing and filled resin cooling step of curing a surface layer of the resin (R) for a certain time and cooling the filled resin (R) for a certain time after the filling of the resin (R) is stopped, a volume controlling step of controlling a volume increase by reducing the mold clamping force after curing the surface layer of the resin (R) for a certain time, and a taking out step of taking out a foam-molded product by opening the mold (2) after the volume control is performed and after cooling the filled resin (R) for a certain time.

The invention relates to a method of manufacturing a sandwich panel comprises the steps of:

a) providing a plate-shaped assembly of a first cover part and a second cover part and between these cover parts a core part of a thermoplastic material containing a physical blowing agent,

b) heating the assembly resulting from step a) under pressure between press tools in a press to a foaming temperature below the glass transition temperature of the thermoplastic material in the core part, thereby effecting adhesion of the foamed core part to the first and second cover parts

c) foaming the thermoplastic material in the core part under pressure and at the foaming temperature wherein the spacing between the press tools is increased;

d) a cooling step of cooling the foamed sandwich panel resulting from step c), while the sandwich panel is maintained under pressure between the press tools;

e) removing the thus cooled sandwich panel from the press; and

f) drying the sandwich panel thus obtained;

wherein the cooling step d) comprises a first substep d1) of cooling the foamed assembly from the foaming temperature to an intermediate temperature in the range of 70-100° C. at a first cooling rate and a second substep d2) of cooling the foamed assembly from the intermediate temperature to ambient temperature at a second cooling rate, the second cooling rate is less than the first cooling rate.

A foamable filament composition comprising a single polymer or blend of polymers and a foaming agent having an activation temperature, wherein the single polymer or blend of polymers has a sufficient molecular weight to allow for polymer chain entanglement, and wherein the single polymer or polymer blend is melt-processable at a temperature below the activation temperature of the foaming agent.