Disclosed is a powder slush molding system that molds a slush skin by melting and adhering a powder resin material to an inner surface of a mold that is heated. The powder slush molding system includes a heating device, a rocking device, a cooling device, a demolding device, and a transfer device configured to transfer the mold between these devices. The cooling device includes a cooling bath and a table configured to turn upside down vertically above the cooling bath. The mold fixedly placed on an upper surface of the table faces the cooling bath side when the table is turned upside down. The table is configured to allow the mold to be placed also on a back surface of the table. The back surface faces upward when the table is turned upside down.

Disclosed is a powder slush molding system that molds a slush skin by melting and adhering a powder resin material to an inner surface of a mold that is heated. The powder slush molding system includes a heating device, a rocking device, a cooling device, a demolding device, and a transfer device configured to transfer the mold between these devices. The cooling device includes a cooling bath and a table configured to turn upside down vertically above the cooling bath. The mold fixedly placed on an upper surface of the table faces the cooling bath side when the table is turned upside down. The table is configured to allow the mold to be placed also on a back surface of the table. The back surface faces upward when the table is turned upside down.

A balance trainer having a dome and a base formed integrally is provided. Also, a mold assembly for manufacturing the balance trainer that has a dome mold, a girdle, and a cover is provided. The girdle is sleeved on the dome mold and the cover is fixed on the girdle and thereby a cavity is formed in the mold assembly. Furthermore, a manufacturing process of the balance trainer is also provided. The process has the following steps: preparing ingredients of the dome and the base; feeding the ingredients of the dome into the dome mold; fixing a membrane on the dome mold via the girdle; feeding the ingredients of the base; sealing the ingredients via the cover; and then rotational molding. With the process and the mold, the rotational molding step can mold two materials at the same time, so the product can have two parts with different hardness.

A balance trainer having a dome and a base formed integrally is provided. Also, a mold assembly for manufacturing the balance trainer that has a dome mold, a girdle, and a cover is provided. The girdle is sleeved on the dome mold and the cover is fixed on the girdle and thereby a cavity is formed in the mold assembly. Furthermore, a manufacturing process of the balance trainer is also provided. The process has the following steps: preparing ingredients of the dome and the base; feeding the ingredients of the dome into the dome mold; fixing a membrane on the dome mold via the girdle; feeding the ingredients of the base; sealing the ingredients via the cover; and then rotational molding. With the process and the mold, the rotational molding step can mold two materials at the same time, so the product can have two parts with different hardness.

An organic peroxide composition is provided which is liquid or near liquid at 25° C. or a low melting solid and which includes at least one ethylenically unsaturated organic peroxide (i.e., an organic peroxide containing at least one carbon-carbon double bond) and at least one saturated organic peroxide. The organic peroxide composition may further include at least one mono- and/or poly-unsaturated compound and at least one free-radical trap. The organic peroxide can be blended into a polymer such as a powdered or granular polyethylene resin. This peroxide-containing polymer can be used in rotational molding, wherein the polymer is added to a mold which is heated in an oven with rotation, thereby melting the polymer and coating the inside of the mold.

Compositions may include a polymer melt blend composition prepared from two polyethylene copolymers having different densities, wherein the polymer melt blend composition possesses improved flowability and impact resistance for low thickness rotomolding applications. Low thickness articles may include a polymer melt blend composition prepared from two polyethylene copolymers having different densities, wherein the articles possess improved finishing properties. Rotomolding processes may include melt blending from two polyethylene copolymers having different densities, pulverizing the melt blend, and rotational molding the composition thereof.

Compositions may include a polymer melt blend composition prepared from two polyethylene copolymers having different densities, wherein the polymer melt blend composition possesses improved flowability and impact resistance for low thickness rotomolding applications. Low thickness articles may include a polymer melt blend composition prepared from two polyethylene copolymers having different densities, wherein the articles possess improved finishing properties. Rotomolding processes may include melt blending from two polyethylene copolymers having different densities, pulverizing the melt blend, and rotational molding the composition thereof.

A wheel for a vehicle is non-pneumatic (i.e., airless), may be designed to enhance its use and performance and/or use and performance of the vehicle, and may be manufactured efficiently, including by a single non-pneumatic tire molding operation that can allow rigid rim incorporation and complex tread implementation.

A method of manufacturing a spa including molding a plurality of side walls, cutting utility openings in said side walls, thereby producing cutouts which are then secured to the side wall and cover at least a part of the utility opening. The cutouts may cover the same utility opening from which it stems or a different utility opening from the same side wall or different side wall. The side walls may be made integral to the basin, such as in rotomolded spas, or made separate from the basin. Certain cutouts are rotated so as to have a major dimension of the cutout cover a minor dimension of the utility opening. Certain cutouts are trimmed from their initial size so as to cover a utility opening smaller than the utility opening from which it stems.

A spider for a rotary molding process is provided. The spider includes an upper mold enclosure, a lower mold enclosure, and a clamping assembly. The lower mold enclosure is configured to selectively cooperate with the upper mold enclosure to facilitate retention of a mold housing therebetween. The clamping assembly comprises a collar, a plurality of brace members, and a clamping member. Each brace member is coupled with each of the collar and the upper mold enclosure. The clamping member is rotatably coupled with the lower mold enclosure and is rotatable about an axis in a clamping and unclamping direction. The axis extends through the collar. The collar is spaced from the upper mold enclosure along the axis. Rotation of the clamping member in the clamping direction facilitates translation of the collar towards the lower mold enclosure to facilitate urging of the upper mold enclosure and the lower mold enclosure together.