Manufacture of hollow articles

• US 4,814,119 A
• Filed: 10/29/1987
• Issued: 03/21/1989
• Est. Priority Date: 10/29/1986
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Scholz, Dankmar
• Primary Examiner(s): Thurlow, Jeffery
• Application Number:
  US07/114,012
• Time in Patent Office: 509 Days
• Field of Search: 264/22, 264/25, 264/236, 264/347, 264/302, 264/257, 264/103, 425/174.4, 425/174, 156/149, 156/273.5
• US Class Current: 264/496
• CPC Class Codes: B29C 35/08 by wave energy or particle radiation B29C64/00, B29C71/04 take precedence
• CPC Class Codes: B29C 35/0888 using transparant moulds
• CPC Class Codes: B29C 41/18 Slush casting, i.e. pouring moulding material into a hollow mould with excess material being poured off
• CPC Class Codes: B29C 53/822 Single use mandrels, e.g. destructible, becoming part of the wound articles B29C53/825 takes precedence
• CPC Class Codes: B29K 2031/00 Use of polyvinylesters or derivatives thereof as moulding material
• CPC Class Codes: B29K 2067/06 Unsaturated polyesters
• CPC Class Codes: B29K 2105/0002 monomers or prepolymers
• CPC Class Codes: B29L 2022/00 Hollow articles tubular articles B29L2023/00; pneumatic tyres B29L2030/00

Abstract

The invention relates to a process for the manufacture of hollow articles, in which a photocurable resin is introduced into a mold which transmits light, the mold is irradiated until the resin has polymerized to the desired depth, the remaining resin is allowed to run out and the partially polymerized layer is then fully cured. The hollow articles may be used in particular as expendable cores in the manufacture of plastics containers by the winding process.

Claims

1. A process for the manufacture of hollow articles which comprises:

(a) introducing a photocurable resin into a mold which transmits light;

(b) irradiating the mold uniformly from all sides, to form a partially polymerized layer;

(c) causing the unpolymerized, liquid resin to run out of the mold;

(d) fully curing the partially polymerized layer, and

(e) separating the mold from the hollow article.

2. The process of claim 1, further comprising surrounding the hollow article separated from the mold with plastic material to form a plastic article, wherein the hollow article separated from the mold is a core in the plastic article.

3. The process of claim 1, further comprising winding a fiber roving impregnated with a reactive resin around the hollow article separated from the mold and curing the resin to produce a second hollow article, wherein the hollow article separated from the mold becomes an internal layer in the second hollow article.