A thermal ink-jet pen cartridge having a rigid external frame member fabricated of a rigid engineering plastic, and an interior frame structure attached thereto, formed of a softer, more ductile plastic material than an engineering plastic An ink reservoir is defined by the interior structure and a pair of flexible bag membranes formed of a plastic material impervious to the ink and compatible with the interior member material, allowing the membranes to be joined to the interior member to form a leak-proof joint The external structure has locking features formed into an interior surface When the interior member is injection molded to the external member, the molten material flows into and around the locking features, securing the interior member to the external member and resisting the shrinkage forces as the molten material cools The ink reservoir is filled through a fill port passageway extending through the external frame member and the inner member The passageway is lined with the softer material of the inner member, and is sealed by an oversized ball press fit into the passageway after the ink filling process

Two material frame having dissimilar properties for thermal ink-jet cartridge

A process for producing an optical element wherein an optical molding is formed by using a mold and thereafter released from the mold by supplying a gas to the boundary between the mold surface and the optical molding. In the process, no localized external force is applied to the optical molding during the release thereof, and therefore undesirable deformation or flaws of the optical molding are not caused.

Process for producing optical element

A process for forming a composite piston of at least two materials, preferably a rigid material and an elastic material, the materials being chemically fused in a modular mold, and the plunger formed thereby. The process comprising injection molding one of the rigid material and elastic material in a mold to form a first piston part; forming a cavity in the mold adjacent the first piston part; injection molding the other of the rigid material and plastic material in the cavity to form a second piston part in contact with the first piston part; and removing the piston having a rigid part and an elastic part from said mold. Upon opening of the mold, complete, finished pistons are presented. The material for forming the elastic part preferably includes a lubricant. The process reduces assembly costs, quality control concerns, and contamination due to human contact.

Composite hypodermic syringe piston

An improved molded closure cap is described which has a softer sealing portion and a relatively hard closure engaging portion. The cap is molded using two differing plastics where the container engaging portion is molded of a softer seal-forming plastic and the remaining portion or shell is molded of a harder plastic. The novel molding apparatus and method employ plunger or die movement to facilitate a successive molding of the soft and hard cap portions without changing the molding plunger or die.

Method and apparatus for molding a closure cap

A method of manufacturing a molded plastic garment hanger having a pair of hingedly connected jaws is provided. The jaws include a thin pad of resilient thermoplastic rubber molded to the inner surface of one or both of the garment-gripping jaws. The pad is formed by injection molding during the molding cycle which forms the hanger body itself with a short dwell period between the injection of the resin forming the hanger body and the injection of the thermoplastic rubber forming the pad so that the pad and body become fused together at the boundary between them.

Article gripping means and method of making same

Vibration isolators are manufactured by a co-injection molding process. Outer and inner parts of the isolators are molded first from a rigid or stiff thermoplastic material such as polystyrene and intermediate spring-like parts of the isolators are made of a thermoplastic elastomer such as copolymer of butadiene and styrene formed and bonded to the outer and inner parts in a subsequent molding step.

Method of coinjection molding of thermoplastic and thermoplastic elastomer

Vibrationsdaempfer und verfahren zu seiner herstellung

L'invention concerne un isolateur de vibrations. Selon l'invention, il comprend des premiere et seconde pieces concentriques et sensiblement espacees 2, 4, en un polymere thermoplastique et raide; et une troisieme piece 6 entre les premiere et seconde pieces, en un elastomere thermoplastique organique, collee ou fixee aux premiere et seconde pieces par liaison directe du polymere thermoplastique organique. L'invention s'applique notamment aux isolateurs du type tubulaire ou du type en plaque.

Hamilton Harold

Papers

Method of coinjection molding of thermoplastic and thermoplastic elastomer

Vibrationsdaempfer und verfahren zu seiner herstellung

Isolateurs de vibrations et procede de production par moulage par co-injection