EP1810755B1

EP1810755B1 - Method to make vessel with heat insulation surface layer

Info

Publication number: EP1810755B1
Application number: EP06001276A
Authority: EP
Inventors: Sheng-Shu Chang; Hung-Ying Su
Original assignee: Rich Cup Bio-Chemical Technology Co Ltd; Rich Cup Bio Chemical Tech Co Ltd
Current assignee: Rich Cup Bio-Chemical Technology Co Ltd; Rich Cup Bio Chemical Tech Co Ltd
Priority date: 2006-01-21
Filing date: 2006-01-21
Publication date: 2009-03-25
Anticipated expiration: 2026-01-21
Also published as: ES2324953T3; DK1810755T3; ATE426462T1; DE602006005892D1; EP1810755A1; PT1810755E; PL1810755T3; CY1109180T1; SI1810755T1

Abstract

One method to make a vessel (7,7') with heat insulation surface layer by mixing a liquid adherence agent (1) with heated foam particle powder (2), then coating the thus formed compound paint (4) on paper or the surface of the molded vessel (7,7'), and then heating this paper or vessel (7,7') so that the surface is foamed due to foam particles, and the liquid adherence agent (1) adheres to the surface of the vessel (7,7'). Furthermore, pattern model can also be applied to surface by spraying or rolling compound paint (4) after having added a pigment and heating so as to form protruding colourful cubic pattern, or by printing in colour after having formed a cubic pattern. Thus, the surface of the vessel (7,7') features in beauty, heat preservation, heat insulation and scald-proof property.

Description

BACKGROUND OF THE INVENTION

1) FIELD OF THE INVENTION

This invention relates to a method of making a vessel with a heat insulation surface layer and, especially, such surface layer that may have a colorful paint on its external side.

2) DESCRIPTION OF THE PRIOR ART

Many common vessels are made of paper or plastic material in order to control cost and popularize usage, such as paper or plastic material-made cups, bowls, discs or vessels made of this material, for example: packing vessels, heat-preserving vessels, snack boxes, etc.
From WO 03 104 338 A it is known to make a vessel having a heat insulation surface layer, including the steps: a) mixing an aqueous dispersion of an adherence agent with heat-expandable polystyrene particles; b) coating this composition on a surface of paper-made or plastic-made vessel and c) heating the thus coated vessel to 70-140°C thereby foaming the coating layer which is combined with the surface of the vessel into one entity.

SUMMARY OF THE INVENTION

Subject matter of the invention is the method described in claim 1. Further modifications thereof can be taken from the subclaims.
According to the method of the invention a liquid adherence agent is mixed with thermally foamable particle powder to form a compound paint which is then coated on a paper-made or plastic-made vessel or semi-product and molding the semi-product into a vessel. The surface of the vessel has a depressed portion that can be made during molding of the vessel. Thereafter the vessel is heated so that a foamed layer is formed on the depressed portion of the surface of the vessel, filling up the depressed portion completely or partially. The foamed surface layer provides a heat insulation effect, so that when the vessel is filled with high temperature material, the holder may not feel hot and scalding, i.e. it can provide a heat preservation, heat insulation and scald-proof effect.
The coating procedure may be carried out by spraying the said compound paint with pigment or by rolling it with a roller whereby a pattern may be formed by heating, which may become a protruding colorful and cubic pattern, or by printing it in color after forming a cubic pattern so as to present a multiple beautiful vision effect. The protruding cubic pattern can provide holder heat insulation function, i.e. it features in beauty, heat preservation, heat insulation and scald-proof effect.
The method of the present invention is applicable to the surface of all paper and plastic-made vessels, and all types of cubic pattern can be made on basis of a pattern model.
The protruding degree of above said cubic pattern is based on the thickness of the compound paint coated; the heating temperature shall be controlled from 80 to 160°C so as to obtain required protruding pattern.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a diamonds sketch map of manufacturing flow of the method according to this invention.
Fig. 2 is a plane sketch map of an idler wheel used in the method according to this invention.
Fig. 2-A is a plane sketch map of a coated semi-product of paper-made vessel made by the method according to the invention.
Fig. 2-B is a perspective view of a vessel coated according to the invention.
Fig. 2-C is a perspective view of a flower pattern-coated surface layer of a vessel made by the method according to the invention.
Fig. 3-A is a perspective view of a paper or plastic-made vessel having a surface foamed.
Fig. 3-B is a perspective view of a paper or plastic-made vessel having a surface layer pattern-foamed.
Fig. 3-C is a perspective view of another paper or plastic-made vessel having a surface foamed.
Fig. 4 is the cross-section of the side wall of a vessel showing a filling foamed layer within a depressed portion of the surface of the vessel, not visible in Figures 2-A to C and 3-A to C.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

According to Fig.1, the manufacturing method of this invention is as follows: Liquid adherence agent 1 is added with foam particle powder 2 by heating, which produces compound paint 4 after mixing 3, then compound paint 4 is coated on the surface of semi-product 6 (such as shown in Fig. 2) or vessel 7,7' (such as shown in Fig. 2 B-C and Fig. 3A-C) with the coating method at least including steps such as spray 5, roller 5' and color printing 5". As stated above, vessel 7,7' is depressed in certain portions 71,(71') while being molded (shown as in Fig. 4) according to suitable scope, so that coating with compound paint takes place in depressed portions 71(71') only and layer 9 may fill up the depressed portion 71(71') when foamed by heating and resume level; thus it can provide a scald-proof effect at reduced production cost. The heating is carried out with heater 8 so that the surface of vessel 7, 7' is foamed based on the heating of the foam particle powder 2, while the liquid adherence agent 1 adheres to the surface of vessel 7,7' so that foamed layer 9 is formed on this surface, which can reinforce the vessel and provide a heat insulation and heat preservation effect.
The adherence agent 1 can be water based or oily; it is adhesive in the course of foaming.
According to Fig.1 and Fig.2, the compound paint 4 can directly set a pattern model on roller 51' of rolling device 5', then the pattern model on roller 51' of rolling device 5' can print compound paint 4 on continuous output paper P from a a paper roll P' at locations that will be depressed during later molding. Then, the paper strip is cut into the planned size of vessel 7 in order to produce semi-product 6 (such as shown in Fig. 2-A), which is molded into a vessel (not described hereby since this is not feature of this invention), whereafter vessel 7(7') is heated so as to form foamed layer 9 on this surface.
According to Fig. 1, Fig. 2 and Fig. 4, layer 9 is applied to surface of paper-made vessel 7 or pre-ejecting molded plastic vessel 7' based on above method, which can insulate heat so that the cup-holder cannot feel scald as the cup is filled with high temperature articles, it can even more provide heat preservation effect. In addition, according to Fig. 3-A-C, a flower pattern model can be applied to the surface layer, by spraying above paint or applying a rolling device (first and second drawing) to roll compound paint 4 on a flower pattern. Then it is heated with a heating device, so that a cubic flower pattern 9 is formed due to foaming and such flower pattern protruding within the depressed portions 71 (71')can provide an additional heat insulation effect. Furthermore, it features in beauty and a scald-proof effect.
According to Fig. 1, Fig. 2-A-C, Fig. 3-A-C, Fig. 4 such above-mentioned vessel 7(7'), can be coated with compound paint 4 in any position where to hold it and size. However, as far as Figures 3-A, 3-B and 3-C show a cubic pattern 9 which, on having been foamed, protrudes from the surrounding outer surface of vessel 7 (7'), such embodiments do not form part of the invention.
According to Fig. 1, Fig. 3-A∼C, Fig. 4 pigment 11 can be filled into above compound paint 4 so that the foamed portion produces a colorful pattern, e.g. a flower pattern; and the portions covered with foamed layer 9 (Fig. 4) may also show colorful pattern by use of color printing 5" after compound paint 4 has been foamed and combined with surface of vessel 7(7').
The protruding degree of the cubic pattern produced within the depressed portion of the surface by foaming is given by the protruding thickness obtained by heating layer 9 at a temperature of from 80 to 160°C.
Above examples of the method according to the invention are used for illustration purposes only; they include all types of paper or plastic-made vessels, such as cups, bowls, trays, snack boxes and packing containers, so as to provide heat insulation, heat preservation, scald-proof and strengthening effects.

Claims

A method to make a vessel with a heat insulation surface layer, including the steps:
a) mixing a liquid adherence agent (1) with thermally foamable particle powder (2) to obtain a compound paint (4);

b) coating the compound paint (4) on a surface of paper-made or plastic-made vessel (7,7') or semi-product (6) and molding the semi-product into a vessel (7,7'); and

c) heating the coated vessel, thereby foaming the compound paint (4) on the surface of the vessel so as to form a foamed layer (9) coagulated due to liquid adherence agent (1) of the compound paint (4) and combined with the surface of the vessel (7,7') into one entity,
characterized in
that in the coating process in step (b) a depressed portion (71,71') provided on the holding position of the vessel (7,7') is covered with the compound paint (4) to fill up the depressed portion (71,71') after foaming by heating, so that the surface of the vessel (7,7') resumes level.
The method as claimed in claim 1,
characterized in
that the compound paint (4) is filled with a pigment so that the foamed portion can produce a colorful pattern.
The method as claimed in claim 1,
characeterized in
that the foamed layer (9) is made by heating the layer (9) to a temperature of from 80 to 160°C.
The method as claimed in claim 1,
characterized in
that the foamed layer (9) is made on a paper-made or plastic-made vessel, such as a cup, bowl, tray, snack box or packing container.
The method as claimed in claim 1,
characterized in
that after the compound paint (4) is foamed, color printing is applied to the foamed pattern.
A vessel having a heat insulation surface layer manufacatured by a process according to one or more of the preceding claims.