US 5,198,174 AGranted

Method for producing a hollow plastic product having a radially extending portion

AssigneeExcell Corporation

InventorsTatsuya Nakagawa, Yasuo Ezaki

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for producing a plastic product including an axially extending portion, such as a duct or pipe, and a radially extending portion, such as a flange or bracket. A parison is placed in a first mold cavity defined in a mold and blow molded to form the axially extending portion, and then a movable mold segment is moved to a retracted position to define a second mold cavity adjacent to a part of an outer peripheral surface of the axially extending portion thus formed. Then, a second molted plastic material is supplied into the second mold cavity and the movable mold segment is again moved to another predetermined position to pressurize the second plastic material to thereby form a radially extending portion. The resulting hollow plastic product is extremely high in structural integrity between the axially and radially extending portions.

Claims11

Dependent claims

A method for producing a plastic product having an axially extending portion and a radially extending portion, comprising the steps of:

(a) placing a parison of a first plastic material in a first mold cavity defined by bringing into contact a plurality of mold sections, at least one of which includes a movable mold segment at a first predetermined position;
(b) introducing a pressurized gas into the interior of said parison to blow mold said parison to thereby form said axially extending portion;
(c) moving said movable mold segment to a second predetermined position to define a second mold cavity adjacent to a part of an outer peripheral surface of said axially extending portion;
(d) supplying a predetermined amount of a second plastic material into said second mold cavity;
and
(e) moving said movable mold segment to a third predetermined position to thereby have said second plastic material in said second mold cavity pressurized to thereby form said radially extending portion, said radially extending portion being integrated with said axially extending portion.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/818,949Filed 10 Jan 1992
Granted: 30 Mar 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B29C 70/74
By incorporating or moulding on preformed parts, e.g. inserts or layers , e.g. foam blocks: moulding material on a relatively small portion of the…
B29C 33/0033
Moulds or cores; Details thereof or accessories therefor: constructed for making articles provided with holes
B29C 43/18
Of articles of definite length, i.e. discrete articles: incorporating preformed parts or layers, e.g. compression moulding around inserts or for…
B29C 43/361
Moulds for making articles of definite length, i.e. discrete articles: with pressing members independently movable of the parts for opening or…