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US 4,790,257 AGranted
Apparatus for the production of fiber web reinforced plastic laminates
AssigneeSantrade Ltd.
InventorKonrad Schermutzki
Life of this patent
Estimating the term…
Abstract
A fiber web reinforced plastic is formed by applying dry resin powder to opposite sides of a vertically moving web, and then melting and pressing the power into the web. The dry powder is applied to the web by being thrown thereagainst. The powder thus more effectively occupies the voids in the web to minimize the presence of air in the web. The thrown-on powder can be melted before the laminating pressure is applied.
Claims23
Apparatus for producing fiber web-reinforced plastic comprising:
- means for advancing a fibrous web generally vertically, and
- a pair of powder-throwing means comprising mutually opposed first rolls rotatable about parallel axes, disposed on opposite sides of the generally vertically advancing web, each of said first rolls comprising:
- a powder-throwing surface movable in a first direction in converging relationship with a respective side of said web, and then in a second direction in non-converging relationship with said respective web side, a width of said surface approximately corresponding to a web width,
- powder depositing means arranged above said surface for loosely depositing plastic powder onto said surface as said surface travels beneath said depositing means, so that plastic powder is loosely carried on said surface, and
- drive means for moving said surface and plastic powder loosely carried thereby in said first direction such that said loosely carried powder is thrown against said respective web side as said surface changes from said first to said second direction, said thrown powder entering said respective web side,
- an additional pair of rollers spaced vertically below said first rolls and disposed on opposite sides of said web downstream of said first rolls,
- heating means disposed between said first rolls and said additional rolls for heating said web and plastic powder contained therein,
- means disposed downstream of said heating means for urging said web and powder together under an influence of heat and pressure, and
- means disposed between said first rolls and said additional rolls of guiding said web in a zigzag direction of travel.
6 more elements
Apparatus for producing fiber web-reinforced plastic comprising:
- means for advancing a fibrous web generally vertically, and
- a pair of powder-throwing means comprising mutually opposed first rolls rotatable about parallel axes, disposed on opposite sides of the generally vertically advancing web, each of said first rolls comprising:
- a powder-throwing surface movable in a first direction in converging relationship with a respective side of said web, and then in a second direction in non-converging relationship with said respective web side, a width of said surface approximately corresponding to a web width,
- powder depositing means arranged above said surface for loosely depositing plastic powder onto said surface as said surface travels beneath said depositing means, so that plastic powder is loosely carried on said surface, and
- drive means for moving said surface and plastic powder loosely carried thereby in said first direction such that said loosely carried powder is thrown against said respective web side as said surface changes from said first to said second direction, said thrown powder entering said respective web side,
- an additional pair of rollers spaced vertically below said first rolls and disposed on opposite sides of said web downstream of said first rolls,
- heating means disposed between said first rolls and said additional rolls for heating said web and plastic powder contained therein, said heating means comprising infrared radiant heaters having quartz tubes which are cooled on their sides facing said web, reflectors disposed on sides of said heaters opposite said web, and
- means disposed downstream of said heating means for urging said web and powder together under an influence of heat and pressure.
5 more elements
Apparatus for producing fiber web-reinforced plastic comprising:
- means for advancing a fibrous web generally vertically, and
- a pair of powder-throwing means comprising mutually opposed rolls rotatable about parallel axes, disposed on opposite sides of the generally vertically advancing web, each of said rolls comprising:
- a powder-throwing surface movable in a first direction in converging relationship with a respective side of said web, and then in a second direction in non-converging relationship with said respective web side, a width of said surface approximately corresponding to a web width,
- powder depositing means arranged above said surface for loosely depositing plastic powder onto said surface as said surface travels beneath said depositing means, so that plastic powder is loosely carried on said surface, and
- drive means for moving said surface and plastic powder loosely carried thereby in said first direction such that said loosely carried powder is thrown against said respective web side as said surface changed from said first to said second direction, said thrown powder entering said respective web side,
- heating means disposed downstream of said powder-throwing means for heating said web and plastic powder contained therein,
- means disposed downstream of said heating means for urging said web and powder together under an influence of heat and pressure, and
- vibrating means for vibrating a portion of said web disposed immediately upstream of said rolls.
5 more elements
Apparatus for producing fiber web-reinforced plastic comprising:
- means for advancing a fibrous web generally vertically, and
- a pair of powder-throwing means comprising mutually opposed first rolls rotatable about parallel axes, disposed on opposite sides of the generally vertically advancing web, each of said first rolls comprising:
- a powder-throwing surface movable in a first direction in converging relationship with a respective side of said web, and then in a second direction in non-converging relationship with said respective web side, a width of said surface approximately corresponding to a web width,
- powder depositing means arranged above said surface for loosely depositing plastic powder onto said surface as said surface travels beneath said depositing means, so that plastic powder is loosely carried on said surface,
- drive means for moving said surface and plastic powder loosely carried thereby in said first direction such that said loosely carried powder is thrown against said respective web side as said surface changes from said first to said second direction, said thrown powder entering said respective web side, and
- means defining a weir above said peripheral surface such that powder flows over said weir prior to being thrown against said web,
- heating means disposed between said first rolls and an additional pair of rolls for heating said web and plastic powder contained therein, and
- means disposed downstream of said heating means for urging said web and powder together under an influence of heat and pressure.
5 more elements
Apparatus for producing fiber web-reinforced plastic comprising:
- means for advancing a fibrous web generally vertically, and
- a pair of powder-throwing means disposed on opposite sides of the generally vertically advancing web, each of said powder throwing means comprising:
- a powder-throwing surface movable in a first direction in converging relationship with a respective side of said web, and then in a second direction in non-converging relationship with said respective web side, a width of said surface approximately corresponding to a web width,
- powder depositing means arranged above said surface for loosely depositing plastic powder onto said surface as said surface travels beneath said depositing means, so that plastic powder is loosely carried on said surface, and
- drive means for moving said surface and plastic powder loosely carried thereby in said first direction such that said loosely carried powder is thrown against said respective web side s said surface changes from said first to said second direction, said thrown powder entering said respective web side,
- heating means for heating said web and plastic powder contained therein,
- means disposed downstream of said heating means for urging said web and powder together under an influence of heat and pressure, and
- a pair of transversely movable web-contacting members disposed on opposite sides of said web above said powder throwing means, said members defining a slot through which said web travels, means for moving said members in opposite directions to intermittently compress said web, said members each including a sloped inlet surface for guiding powder toward said web, springs for biasing said members toward one another, and means for periodically urging said members apart against the bias of said springs.
5 more elements
Dependencies are inferred from the claim text.