Method of operating a two-shot injection-molding machine

Details Method of operating a two-shot injection-molding machine Method of operating a two-shot injection-molding machine

1981-12-21

1984-04-24

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264255, 264334, B29F 114, B29C 508

Patent

active

044447116

ABSTRACT:
There is disclosed a method of operating an injection-molding machine to produce a composite item that includes a portion of soft material such as a set of bristles tending to cling to a mold cavity in which it is formed. At a first station, a relatively flexible plastic material is injected into a first cavity shaped to define the portion of soft material of the composite item, that portion including a backing layer. The portion of soft material is then allowed to cool, and at a subsequent station there is injected a relatively rigid plastic material into a second cavity bounded by the backing layer. The second cavity defines a harder portion of the composite item such as a brush handle. After the latter portion has also cooled, the portion of soft material is separated from the first cavity by pulling on the harder portion at a rate of speed slow enough to avoid rupture of the portion of soft material.

REFERENCES:
patent: 1563529 (1925-12-01), Satterlee
patent: 2592296 (1952-04-01), Kutik
patent: 2783490 (1957-03-01), Kutik
patent: 3004291 (1961-10-01), Schad
patent: 3098262 (1963-07-01), Wisotzky
patent: 3128488 (1964-04-01), Schad
patent: 3317644 (1967-05-01), Takai
patent: 3454991 (1969-07-01), Rees
patent: 4243362 (1981-01-01), Rees et al.
patent: 4244076 (1981-01-01), Meyer

Affiliated with

Also associated with

Rating

Method of operating a two-shot injection-molding machine 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 operating a two-shot injection-molding machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of operating a two-shot injection-molding machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-115061