JPS59171638A - Method of molding box using both-surface synthetic resin laminated processed paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a box (carton) using processed paper coated with synthetic resin on both sides and subjected to corona discharge treatment on the surface.

It is well known that the above-mentioned boxes have excellent contents protection performance due to their film action, and have therefore come to be widely used as cartons for various foods, including frozen foods.

By the way, because the processed paper that makes up the above-mentioned cartons has a film, there is a problem that it is difficult to absorb water and solvents because the non-absorbent surfaces are similar. In addition to the molding machine, it must be prepared, but the machine described above has several thousand blades.
Because it is extremely expensive, it is a considerable burden for small and medium-sized box manufacturers to equip this expensive machine.
Currently, there are only a few companies in Japan that have introduced the above machines, and as a result, the demand for cartons is increasing.
It is undeniable that this is the cause of the inability to meet demand.

Therefore, the basic idea of the present invention is to use a special adhesive instead of heat-based bonding means, and to achieve this by using a box forming machine that anyone skilled in the art has, that is, a sack bonding method. Alternatively, the so-called auto-bottom type gluing method, which is a well-known method for producing paper surfaces without a film, allows boxes to be formed using an automatic box-forming machine as is.

In the method of the present invention, the adhesive used is based on a styrene butadiene rubber (hereinafter referred to as SBR) comb and an alicyclic saturated hydrocarbon resin, with the addition of a volatile solvent such as toluene, n-hexane, or methyl ethyl ketone. The non-volatile content is θ~7θ.

The viscosity is adjusted within the range of 1000 to 3oooOo OP S (Brookfield viscometer/θrpm, 2jC), and it has excellent initial adhesion strength and is effective against poor adhesion during delivery using bag pasting machines, auto bottom type automatic pasting machines, etc. Does not cause any problems. Therefore, when this adhesive is used, double-sided synthetic resin laminated paper can be molded using a sack pasting machine, an auto-bottom type automatic pasting machine, etc. in the same manner as ordinary emulsion adhesives. Moreover, no change occurs over time on the adhesive surface. Compared to the heat sealer method and hot melt adhesive method, it does not require a heat source, so it saves energy and eliminates the need for complicated heat management.

In the present invention, the adhesive used is a sack pasting machine.

When used in an automatic box forming machine such as an automatic bottom-type pasting machine, use BBR rubber as a yo to 2θ ratio, alicyclic saturated hydrocarbon resin as a 30 to θ ratio, and volatile materials such as toluene, methyl ethyl ketone, n-hexane, etc. Use a solvent to adjust the nonvolatile content to 0 to 20% and the viscosity to yθ0θ to 3θθ0θ0PS.
(Brookfield, viscometer 7 o rpm, 2
．． If the adhesive is outside this range, the adhesive strength will decrease, the mechanical stability within the adhesive coating device will deteriorate, the amount of adhesive applied will be unstable, adhesive residue will accumulate, etc. A problem arises.

This adhesive is cold resistant (-No problem at 0C).

It has good heat resistance (no problems at /θ0C), water resistance, and corrosion oil resistance, and has adhesive strength using the conventional heat sealing method.

It is equivalent to or better than the hot melt method. In addition, since it has passed the Food Sanitation Act, it can be widely used as food packaging such as frozen food cartons.

This adhesive can be applied on the machine by any method, such as a foil method or a timing spray method, and the adhesive surface can be crimped by any commonly used crimping method after application. .

The present invention will be explained in more detail with reference to Examples below.
The present invention is not limited to these.

Example/Basic weight 3/θ of polyethylene laminated on both sides of base paper
y/m” double-sided polyethylene laminated paperboard is punched into blanks using an automatic flat plate punching machine, and then cut into blanks using an automatic box forming machine.
Using the adhesive shown in Figure 2, each adhesive was applied at a constant solid content of 2 oy/rn2, and pressure bonding was performed under the same conditions to determine the quality of the initial adhesion upon delivery.

Changes over time in each environment on the adhesive surface were measured. M1
Adhesives adjusted to

Table/ */ In a low temperature tester at -da 0℃, fif1*2
Soak in tap water for 2 hours *3 Place in a gear oven heated to 100'i for 2 hours *3 Soak in salad oil? Time *j Test lard on both sides of the bonded area Time Example 2 In the same manner as described in Example 1, blanks were punched out and formed using the method shown in Table 1, and initial adhesion upon delivery was performed. The quality of the force and changes over time in various environments on the adhesive surface were measured. The results are shown in Table 2.

As is clear from this, it can be seen that the molding method obtained from A according to the method of the present invention is equivalent to or superior to the heat sealing method and the hot melt method.

Table / Adhesion Method Table 2 * 2 years in a low temperature tester at l -g θC * 2 Soaked in tap water for 2 hours * 3 1 2 hours in a gear oven heated to l θ 0 C * 4 tons in salad oil * Apply lard to both sides of the bonded area for 2 hours.As described above, according to the present invention, when forming a box from processed paper having a synthetic resin film on the screen, conventionally expensive heat seal machines and hot melt machines are required. However, according to the present invention, because the bonding and molding is performed using a special adhesive, there is no need for an expensive Najito seal machine or hot melt machine, and any box manufacturer can Moga(i)
The so-called well-known gluing machines, such as the TI+ type sac pasting machine and the autobottom type automatic pasting machine, have a serious flaw length that allows the automatic molding machine to be used as is, and the economic seedlings are extremely thick.

Claims (1)

[Claims] A die-cut box blank made by cutting processed paper coated with synthetic resin on both sides and treated with corona discharge on the surface is then processed using the well-known automatic box forming method for gluing paper that does not have a coating. In order to enable molding using a machine, the above-mentioned film surfaces that are bonded to each other are coated with volatile substances such as toluene, n-hexane, and methyl ethyl compound based on styrene-butadiene rubber and alicyclic saturated hydrocarbon resin. Add solvent to reduce non-volatile content to 0~20%, viscosity θ00~3θθ
θθcps (Brookfield viscometer to rpm
A method for forming a box using double-sided synthetic resin laminated paper, characterized by applying a solvent-based adhesive adjusted to .