An injection moulded acoustic filter comprising a foil piece or filter structure having a plurality of micro-slits configured to act as acoustic channels through the foil piece for filtering sound waves impinging the foil piece. The micro-slits have a maximum slit width across a surface of the foil piece of less than one hundred micrometres and a combined slit length along the surface of the foil piece of at least five millimetres. An earplug comprising the acoustic filter. A method and mould for manufacturing the acoustic filter.

A toothbrush comprised at least one unitary brush head having a base and at least one filament and extending therefrom and having a free end terminating with a tip, wherein the filament has a length of from 6.0 mm to 20.0 mm between the base and the free end, and wherein the unitary brush head is made from a plastic material that has a melt flow rate of not greater than about 30 g/10 min measured in accordance with ISO 1133.

A toothbrush comprised at least one unitary brush head having a base and at least one filament and extending therefrom and having a free end terminating with a tip, wherein the filament has a length of from 6.0 mm to 20.0 mm between the base and the free end, and wherein the unitary brush head is made from a plastic material that has a melt flow rate of not greater than about 30 g/10 min measured in accordance with ISO 1133.

One aspect relates to a device for producing a spacer having

a stem mold which has an inner space, wherein the inner space is accessible via a proximal opening and wherein the stem mold has a proximal wall which peripherally delimits the proximal opening of the stem mold,

a head mold which has in the interior thereof a hollow space, wherein the hollow space has a spherical surface-shaped inner surface and is accessible via a distal opening, wherein the head mold has a distal wall which peripherally delimits the distal opening of the head mold,

a metal core which has a stem part, a head part and a flange, wherein the flange projects out from the metal core, is arranged between the stem part and the head part and has a proximal surface and a distal surface,

wherein the stem mold and the stem part are shaped such that the stem part is arranged in the inner space, when the proximal wall is resting against the distal surface, and wherein the head mold and the head part are shaped such that the head part is arranged in the hollow space, when the distal wall is resting against the proximal surface.

One aspect relates to a device for producing a spacer having

a stem mold which has an inner space, wherein the inner space is accessible via a proximal opening and wherein the stem mold has a proximal wall which peripherally delimits the proximal opening of the stem mold,

a head mold which has in the interior thereof a hollow space, wherein the hollow space has a spherical surface-shaped inner surface and is accessible via a distal opening, wherein the head mold has a distal wall which peripherally delimits the distal opening of the head mold,

a metal core which has a stem part, a head part and a flange, wherein the flange projects out from the metal core, is arranged between the stem part and the head part and has a proximal surface and a distal surface,

wherein the stem mold and the stem part are shaped such that the stem part is arranged in the inner space, when the proximal wall is resting against the distal surface, and wherein the head mold and the head part are shaped such that the head part is arranged in the hollow space, when the distal wall is resting against the proximal surface.

In an aspect, a mold stack may comprise two adjacent components, one at least partially defining a vent adjustable between a molding configuration and a cleaning configuration. A junction of the components may be adjustable between a molding configuration, wherein mating faces contact one another to define a parting line, and a cleaning configuration, wherein mating faces are separated to create a molding cavity extension therebetween and an auxiliary melt barrier prevents uncontrolled flashing from the extension.

In an aspect, a mold stack may comprise two adjacent components, one at least partially defining a vent adjustable between a molding configuration and a cleaning configuration. A junction of the components may be adjustable between a molding configuration, wherein mating faces contact one another to define a parting line, and a cleaning configuration, wherein mating faces are separated to create a molding cavity extension therebetween and an auxiliary melt barrier prevents uncontrolled flashing from the extension.

In an aspect, a mold stack may comprise two adjacent components, one at least partially defining a vent adjustable between a molding configuration and a cleaning configuration. A junction of the components may be adjustable between a molding configuration, wherein mating faces contact one another to define a parting line, and a cleaning configuration, wherein mating faces are separated to create a molding cavity extension therebetween and an auxiliary melt barrier prevents uncontrolled flashing from the extension. In another aspect, a mold shut height adjustment mechanism may include a mold component movable along an operational axis of the mold, a stop member, movable along the axis relative to the mold component, having first and second stops for providing first and second gaps on the front and back sides, respectively, of the mold component when the stop member is deployed, and a spacer for use in selectively deploying the stop member.

In an aspect, a mold stack may comprise two adjacent components, one at least partially defining a vent adjustable between a molding configuration and a cleaning configuration. A junction of the components may be adjustable between a molding configuration, wherein mating faces contact one another to define a parting line, and a cleaning configuration, wherein mating faces are separated to create a molding cavity extension therebetween and an auxiliary melt barrier prevents uncontrolled flashing from the extension. In another aspect, a mold shut height adjustment mechanism may include a mold component movable along an operational axis of the mold, a stop member, movable along the axis relative to the mold component, having first and second stops for providing first and second gaps on the front and back sides, respectively, of the mold component when the stop member is deployed, and a spacer for use in selectively deploying the stop member.

A method for manufacturing a resin pipe joint with a joint body includes the following steps. Preparing a mold and a supply device configured to supply molten resin. The mold includes a first mold for an outer shape of the joint body and a second mold for an inner shape of the joint body. Combining the second mold with the first mold to form a cavity, into which the molten resin is injectable, inside the mold. Supplying the molten resin to the cavity in the mold. Solidifying the molten resin in the cavity after stop of the supply of the molten resin from the supply device. The second mold has a gap that connects the cavity to a discharge space outside the cavity and allows gas to flow.