Foamed polyolefin-based resin container and process for producing the same
OwnerNobuhiro Usui, Takeo Kitayamainventors
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Abstract
The present invention provides a foamed polyolefin-based resin container formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5 and a process for producing the same, and the like. The container relates to a container for food products such as retorted food products, particularly to a container for food products using a foamed polyolefin-based resin sheet as a substrate.
Claims17
A foamed polyolefin-based resin container formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5.
A process for producing a foamed polyolefin-based resin container formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5, the process comprising:
- (1) heating and softening the foamed resin sheet while clipping and fixing the edge of the foamed resin sheet with a clip;
- (2) generating a pressure difference between both sides of the foamed resin sheet to expand the heated and softened foamed resin sheet so as to project toward the lower pressure side;
- (3) forming the heated and softened foamed resin sheet into a formed product having a configuration of the container by operation comprising making a male mold member having a configuration of the product touch the heated and softened foamed resin sheet from its projecting side, making the foamed resin sheet touch the surface of the male mold member while moving the male mold member toward the higher pressure side through the clip, and vacuuming a gap between the foamed resin sheet and the surface of the male mold member, thereby making the foamed resin sheet firmly touch the surface of the male mold member;
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- (4) taking out the formed product having the configuration of the container.
A process for producing a foamed polyolefin-based resin container formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5, the process comprising:
- (1) heating and softening the foamed resin sheet while clipping and fixing the edge of the foamed resin sheet with a clip;
- (2) generating a pressure difference between both sides of the foamed resin sheet to expand the heated and softened foamed resin sheet so as to project toward the lower pressure side;
- (3) forming the heated and softened foamed resin sheet into a formed product having a configuration of the container by operation comprising making a male mold member having a configuration of the product tough the heated and soften foamed resin sheet from its projecting side, making the foamed resin sheet touch the surface of the male mold member while moving the male mold member toward the higher pressure side through the clip, and vacuuming a gap between the foamed resin sheet and the surface of the male mold member, thereby making the foamed resin sheet firmly touch the surface of the male mold member;
- (3′) establishing a configuration of an outer surface of the container, the step comprising engaging the male mold member with the female mold member installed in the opposite side relative to the foamed resin sheet simultaneously with or after the first stage of the forming step, and vacuuming a gap between the foamed resin sheet and the female mold member to make the foamed resin sheet firmly touch the female mold member, thereby making the foamed resin sheet firmly touch the female mold member;
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- (4) taking out the formed product having the configuration of the container.
A process for producing a plurality of foamed polyolefin-based resin containers formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5, the process comprising:
- (1) heating and softening the foamed resin sheet while clipping and fixing the edge of the foamed resin sheet with a clip;
- (2) making a partitioning member touch or almost touch the foamed resin sheet to define a plurality of container-forming areas;
- (3) generating a pressure difference between both sides of the foamed resin sheet so that the side where the partitioning member is present become the lower pressure side, and making the heated and softened foamed resin sheet firmly touch the partitioning member so as to project the foamed resin sheet toward the lower pressure side in every container-forming area;
- (4) forming the heated and softened foamed resin sheet into a formed product having a configuration of the container by operation comprising making a male mold member having a configuration of the product touch the heated and softened foamed resin sheet from its projecting side, making the foamed resin sheet touch the surface of the male mold member while moving the male mold member toward the opposing side relative to the foamed resin sheet, and vacuuming a gap between the foamed resin sheet and the surface of the male mold member, thereby making the foamed resin sheet firmly touch the surface of the male mold member;
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- (5) taking out the formed product having the configuration of the container.
A process for producing of a plurality of foamed polyolefin-based resin containers formed from a foamed polyolefin-based resin sheet comprising a foamed layer having an expansion ratio of from 1.5 to 8 times and a thickness of not greater than 6 mm wherein a draw ratio [(the height of the container)/(the minimum dimension of an opening of the container)] is from 0.6 to 1.5, the process comprising:
- (1) heating and softening the foamed resin sheet while clipping and fixing the edge of the foamed resin sheet with a clip;
- (2) making a partitioning member touch or almost touch the foamed resin sheet to define a plurality of container-forming areas;
- (3) generating a pressure difference between both sides of the foamed resin sheet so that the side where the partitioning member is present become the lower pressure side, and making the heated and softened foamed resin sheet firmly touch the partitioning member so as to project the foamed resin sheet toward the lower pressure side in every container-forming area;
- (4) forming the heated and softened foamed resin sheet into a formed product having a configuration of the container by operation comprising making a male mold member having an inner surface configuration of the product touch the heated and softened foamed resin sheet from its projecting side, making the foamed resin sheet touch the surface of the male mold member while moving the male mold member toward the opposing side relative to the foamed resin sheet, and vacuuming a gap between the foamed resin sheet and the surface of the male mold member, thereby making the foamed resin sheet firmly touch the surface of the male mold member;
- (4′) establishing a configuration of an outer surface of the container by operation comprising engaging the male mold member with a female mold member, having an outer surface configuration of the product, installed in the opposite side relative to the foamed resin sheet simultaneously with or after the step (4), and vacuuming a gap between the foamed resin sheet and the surface of the female mold member, thereby making the foamed resin sheet firmly touch the surface of the female mold member;
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- (5) taking out the formed product having the configuration of the container.
Dependencies are inferred from the claim text.