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US 11,472,090 B2Granted
Preform and bottle
AssigneeYoshino Kogyosho Co., Ltd.
InventorsJunichi Chiba, Hiroshi Hosokoshiyama
Life of this patent
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Abstract
Provided is a method for manufacturing a preform (1). The method includes injecting into a cavity of a mold through the gate: (i) a first colored resin (R1) for a first predetermined time period, and (ii) a second colored resin (R2), having a color different from that of the first colored resin, for a second predetermined time period.
Claims4
A method for manufacturing a synthetic resin preform, the preform comprising:
- (i) a base material layer made of a first colored resin, (ii) a colored layer that is made of a second colored resin having a color different from that of the first colored resin and forms a gradation region on an outer circumferential side of the base material layer, wherein a layer thickness of the gradation region gradually decreases upward, and (iii) a coating layer, made of the first colored resin, on an outer circumferential side of the colored layer, the method comprising:
- filling the first colored resin in a gate disposed in correspondence with a middle of a bottom of the preform,
- injecting into a cavity of a mold through the gate:
- (i) the first colored resin for a first predetermined time period, and (ii) the second colored resin material, having a color different from that of the first colored resin, for a second predetermined time period,
- wherein:
- (i) a starting time point of the first predetermined time period is set to be between a starting time point of the second predetermined time period and a finishing time point of the second predetermined time period,
- (ii) a finishing time point of the first predetermined time period is set to be after the finishing time point of the second predetermined time period, and
- (iii) an injection rate of the second colored resin is set to be faster than an injection rate of the first colored resin, so that:
- (i) the second colored resin penetrates a center portion of the first colored resin under a state in which a region on an outer circumferential surface of the cavity is coated with the first colored resin, where the region corresponds to the gradation region, and then
- (ii) the first colored resin penetrates a center portion of the second colored resin located inside the cavity of the mold, such that the first colored resin is caused to flow while stretching the second color resin, so as to form:
- (a) the colored layer on the outer circumferential side of the base material layer, and (b) the coating layer on the outer circumferential side of the colored layer.
8 more elements
Dependencies are inferred from the claim text.