Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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B29C
SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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45/00
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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B29C45/17
Component parts, details or accessories; Auxiliary operations
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B29C45/1703
Introducing an auxiliary fluid into the mould
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B29C45/1704
the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
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B29C2045/1725
making hollow seals
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B29C2045/1725

IMPROVEMENTS RELATING TO FACE MASKS
20240025096 · 2024-01-25 ·

Face masks, including filter masks, and methods for their production. The disclosed methods include using an overmoulding step to both form a sealing member and to fix the sealing member to a support frame and a sheet of filtering material.