Dustfree filling and sealing apparatus, dustfree container and wrapping clean film producing method
A dustfree filling and sealing apparatus is disclosed. A pair of wrapping clean films 10 which are free of cleaning are supplied from a pair of wrapping clean film supply means 1 . Two outer layer films 10 b are peeled off and removed from the wrapping clean films 10 by a pair of outer layer film peeling-off means 2 . Thus, clean surfaces of inner layer films 10 a appear. The two inner layer films 10 a are conveyed by a pair of inner layer film conveying means 4 so that these films are opposed. An object 15 is inserted between the inner layer films 10 a by an object filling means 5 . The inner layer films 10 a are sealed by an impulse seal head 6 . The present invention also discloses a wrapping clean film producing method and a dustfree container.
1. A method for producing a wrapping clean film, comprising the steps of:
preparing a heat-resisting substrate;
forming co-extruded films composed of at least two layers of thermoplastic resin films by co-extrusion; and
layering and laminating the co-extruded films on both front and rear surfaces of the heat-resisting substrate by dry-lamination,
wherein outermost thermoplastic films of the co-extruded films are peelable from inner thermoplastic films of the co-extruded films laminated to said heat-resisting substrate to form said wrapping clean film.
2. The method as set forth in claim 1 , further comprising the step of:
applying a bonding agent on both front and rear surfaces of the heat-resisting substrate,
where said applying step is followed by said laminating step.
3. The method as set forth in claim 1 , further comprising the step of:
corona-treating the surfaces of the co-extruded films which are later placed in contact with the heat-resisting substrate during said laminating step,
wherein said corona-treating step is followed by said laminating step.
4. The method as set forth in claim 1 ,
wherein said co-extruding step is performed at a temperature of 290° C. or below.
5. A method for producing a wrapping clean film, and for wrapping an object in the wrapping clean film, comprising the steps of:
preparing a heat-resisting substrate;
co-extruding films comprising at least two layers of thermoplastic resin;
dry-laminating the co-extruded films on both front and rear surfaces of the heat-resisting substrate, so as to produce a wrapping clean film of the co-extruded films wherein the wrapping clean film comprises inner thermoplastic films of the co-extruded films laminated to front and rear surfaces of the heat-resisting substrate having peelable outermost thermoplastic films;
peeling off the outermost thermoplastic resin films from the inner thermoplastic films of the wrapping clean film just outside a clean room and supplying the wrapping clean film to the clean room; and
using the wrapping clean film within the clean room to wrap an object.
6. The method of claim 5 , further comprising the step of applying a bonding agent on both front and rear surfaces of the heat-resisting substrate, wherein said applying step is followed by said laminating step.
7. The method of claim 5 , further comprising the step of corona-treating the surfaces of the co-extruded films which are later placed in contact with the heat-resisting substrate during said laminating step, wherein said corona-treating step is followed by said laminating step.
8. The method of claim 5 , wherein said co-extruding step is performed at a temperature of 290° C. or below.