Method of extruding foamed plastic sheathed pencils

Details Method of extruding foamed plastic sheathed pencils Method of extruding foamed plastic sheathed pencils

1974-04-24

1976-02-03

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 459, 264174, 401 96, 425113, 425817C, 428310, 428315, 428408, B29D 2700, B29F 310, B43K 1914

Patent

active

039365190

ABSTRACT:
An automated system for fabricating a lead pencil in which the lead is securely bonded to a sheath formed of foam plastic material and having a smooth skin. In the system, individual pieces of lead which are pre-treated with a heat-activatable adhesive layer, are sequentially fed into an extrusion die in which the lead is ensheathed by molten foam plastic material whose heat serves to activate the adhesive. The string of ensheathed lead pieces emerging from the die are advanced through a sizing jig in a cooling station wherein the diameter of the sheath is rendered uniform and the surface thereof is formed into a smooth skin, the sheath being rigidified in the station and the activated adhesive being set to strongly bond the lead to the sheath. The resultant rod is fed to a cut-off station which serves to sever the rod into individual pencils.

REFERENCES:
patent: 2319585 (1943-05-01), Chesler
patent: 2960967 (1960-11-01), Bauserman
patent: 3175538 (1965-03-01), Gossel
patent: 3625788 (1971-12-01), Bartner
patent: 3704071 (1972-11-01), Muller et al.
patent: 3764642 (1973-10-01), Boutillier
patent: 3804574 (1974-04-01), Gatto
patent: 3875088 (1975-04-01), Arons et al.

Affiliated with

Also associated with

Rating

Method of extruding foamed plastic sheathed pencils does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of extruding foamed plastic sheathed pencils, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of extruding foamed plastic sheathed pencils will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2122550