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Thermoplastic articles formed with smooth edges and optionally peelable surfaces

A product, planar technique used in the field of forming shaped thermoplastic products

Active Publication Date: 2021-12-14
CONVERTER MFG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Roll-rim drinking cups are also not designed to be easily wrapped or sealed with plastic wrap

Method used

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  • Thermoplastic articles formed with smooth edges and optionally peelable surfaces
  • Thermoplastic articles formed with smooth edges and optionally peelable surfaces
  • Thermoplastic articles formed with smooth edges and optionally peelable surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Figure 6A with Figure 6B A thermoplastic tray is shown thermoformed from a flat sheet of thermoplastic material and then cut from the sheet. In each of these figures, a sharp edge formed by the cutting process is shown where a finger touches the sharp edge. After applying the smoothing process described herein to these pallets, the pallets would appear approximately as shown in Figure 3, where the sharp edge has been "turned over" so that the sharp edge faces the main body of the pallet and the smooth portion, which passes through at least The flexed area of ​​the deflectable flange is deflected and heated and cooled to create a smooth outer perimeter of the tray that does not interfere with the plastic film attached to the edge of the tray or wrap snugly around the entire The plastic film around the tray has an effect.

Embodiment 2

[0143] This example is provided to illustrate the forming and sealing of shaped articles as described herein. In this example, the forming, filling and sealing of a container containing cut pieces of fresh fish is described.

[0144] The shaped article for receiving the fish is formed by conventional thermoforming methods. Thermoformable material in sheet form (e.g. PET) is heated above its glass transition temperature and pushed using conventional thermoforming techniques (using male or female molds, with or without positive and / or negative pressure) The part of the sheet against the part of the mould) pushes against the mould. This thermoforming produces a tray-like container having an overall rectangular shape with rounded corners and comprising a recessed inner portion for receiving the fish cut. The rounded rectangular overall shape of the container is defined by a deflectable flange enclosing the inner portion around its entire perimeter. The deflectable flange has F...

Embodiment 3

[0151] Roll-up edge MAP tray with peelable surface

[0152] One embodiment of the thermoplastic article described herein has proven particularly useful and is described in detail in this example. This embodiment is an article having the shape of any industry standard tray-like container (colloquially referred to by those skilled in the art as a "MAP tray"). Such trays have a recessed interior space for containing or containing items (eg, cuts of fish, poultry or other meat, collections of plant parts, such as vegetables, mushrooms or fruits such as cherries). The rim completely surrounds the recessed interior such that when a MAP pallet is placed on a horizontal surface (MAP pallets tend to have a flat bottom for stable placement on a horizontal or sloped surface), the material within the recessed interior will generally not Flows, spills or tumbles off the rim and thereby out of the recessed interior space. Extending atop the rim and (usually completely) around the opening ...

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PUM

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Abstract

The present invention relates to the formation of shaped thermoplastic articles having a smooth periphery. Many thermoplastic articles have sharp edges that form when a stock sheet is molded or an article is cut from a stock sheet (eg, after thermoforming). Such sharp edges can damage the plastic film or flesh they contact, and it is desirable to smooth such edges. Described herein is a method of creating a smooth periphery for such sharp-edged articles by inverting the sharp edges. The smoothing operation is performed by forming a deflectable flange, wherein the deflectable flange includes a bend region spaced from a potentially sharp peripheral edge by a spacer, deflecting a portion of the deflectable flange, and dividing the deflectable flange The at least one bent portion of the softens to produce a smooth outer perimeter upon cooling. The inner liner sheet may be attached to and peelable from the stock sheet before, during or after forming.

Description

technical field [0001] The present invention relates generally to the field of forming shaped thermoplastic articles. Background technique [0002] Forming shaped articles from thermoplastic materials is well known. Shape can be imparted to molten thermoplastics or preformed thermoplastic sheets that have been softened or melted using a number of different methods such as thermoforming, casting, molding, and spinning. [0003] Trimming waste from one or more edges of a shaped article is a common trimming technique, but leaving a sharp edge can injure the flesh or tear or cut the material in contact with the edge. A common use of shaped thermoplastics is to form containers that can be sealed with a plastic film, such as trays, bowls or bins that are intended to contain food and are intended to be sealed with a transparent plastic film. Another common use is to contain items and insulate them from moisture or other materials that may come into contact with the container. Se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C51/14B29C51/30B65D1/36
CPCB65D25/16B29L2031/7162B29C51/325B29C53/34B29C51/14B65D1/34B65D11/26
Inventor 米勒德·F·华莱士
Owner CONVERTER MFG LLC