Patent ID: 9598803
Date: 2017-03-21
CPC Classifications: B29C,B29D,B29L,D04H

Claim:
1. A method of secondary forming a cushion having a spring-like structure made of continuous filaments tangled at random in loops and made to partly adhere to one another with heat after primary forming the cushion, the method comprising: a thermal softening step of thermally softening a three-dimensional netted structure having a plurality of surfaces formed thereon by hot press, wherein the three-dimensional netted structure comprises a first part and a second part, the bulk density of the three-dimensional netted structure is 0.03 to 0.20 g/cm a compression step of compressing the first part of the three-dimensional netted structure with the upper mold and the lower mold; a curing step of forcibly or naturally cooling down the three-dimensional netted structure with a coolant to cure texture of the three-dimensional netted structure; and a mold release step of releasing the three-dimensional netted structure from the mold; wherein: in the thermal softening step and in the compression step, the second part of the three-dimensional netted structure is spaced from the upper mold and is not in contact with the upper mold; and in the compression step, when the three-dimensional netted structure is in a compression state, a space is formed between the upper surface of the second part of the three-dimensional netted structure and the upper mold while the first part of the three-dimensional netted structure is compressed by the upper mold and the lower mold.