The present invention relates to an injection moulding system for forming an oven liner, particularly of the type that is used with microwave ovens. Oven liners are of particular benefit when used inside microwave ovens. They improve hygiene as where food spills or spurts onto the oven liner rather than an interior of the microwave oven. An injection moulding system for forming an oven liner includes: a first mould tool which defines a cavity of length (L), width (W) and height (H), the first mould tool has a substantially rectangular end face with dimensions corresponding to the width (W) and height (H) of the cavity and has a hot feed located at a centroid of its end face; and a wedge collapsing tool is received in the cavity so as to contact and engage with an external periphery of the first mould tool at selected locations in order to define a volume into which hot material feed is injected, wherein the wedge collapsing tool comprises a first part and a second part in slidable contact one with another, and the width (W2) of the second part exceeds the width (W1) of the first part of the wedge collapsing tool by at least 0.1 mm so that a split line is formed on at least one side of an interior surface of the oven liner.

A steam cleaning system for cleaning a microwave oven without chemical cleaners includes an oven. A bowl is provided that contains a liquid and the bowl is selectively positioned within the oven. The oven boils the liquid thereby producing steam. The steam penetrates debris is stuck to the oven thereby facilitating the debris to be cleaned from the oven. A cloth is provided and the cloth is selectively positioned in the bowl. The cloth is comprised of a liquid permeable material such that the cloth absorbs the liquid. Moreover, the steam is released from the cloth when the oven is turned on to heat the liquid.

Provided are cleaning devices adapted for a microwave oven. A head cap of the cleaning device includes multiple through holes, and thus steam generated by heating a cleaning liquid can flow out of the through holes in a faster and more concentrated mode. Using the cleaning device of this disclosure, the cleaning operation for the microwave oven is more convenient, and safety hazard such as explosion or splashing is also prevented as well.

An apparatus for cleaning a microwave oven includes a vessel to form a steam chamber with an exhaust port. Water or other cleaning agent is placed in the bowl and the bowl is placed into the microwave oven and the oven is operated, steam is ejected from an orifice in a concentrated plume. The steam softens food remains and other dirt on the walls of the oven for easy removal.

A high-frequency cooker includes: a heating chamber; a high-frequency generating device; a waveguide which is formed on a surface opposite to the heating chamber and which guides a microwave generated by the high-frequency generating device; a power feed port which is formed on a wall of the heating chamber and which allows the microwave guided by the waveguide to be supplied into the heating chamber; a microwave transmitting cover which closes the power feed port; and an umbrella-shaped member which is provided on a surface upper than the power feed port so as to cover an upper edge of the microwave transmitting cover. The umbrella-shaped member includes a step provided at both end portions of the umbrella-shaped member to reduce a gap with a wall surface of the heating chamber, and the microwave transmitting cover is fixed so as to be inserted into the gap.