Reinforced file seal and production process thereof

Abstract

The invention provides a preparation process of a reinforced file seal. A silk net is applied among surface paper, core paper and inner paper, reinforcement coatings are sprayed, a micron-grade protective layer is formed, and the file seal with excellent reinforcement performance is obtained; the preparation process comprises the steps of preparation of the core paper and the inner paper, attaching of the core paper and the inner paper, pretreatment of the surface paper, preparation of the reinforcement coatings and making of the file seal.

Description

technical field

[0001] The invention relates to the technical field of packaging, in particular to a reinforced document envelope for letter packaging and delivery. Background technique

[0002] After encapsulating the letter or document, the envelope is delivered to the recipient by the post office or courier company to realize the information exchange between the sender and the recipient; It saves the cost or time cost of communication between the sender and the recipient, and the mailing of letters or documents in envelopes facilitates people's lives. At present, the envelopes selected by post offices or courier companies are made of paper materials, and general paper materials have poor reinforcement performance.

[0003] In the early stage, the inventor used multi-layer micro-corrugated cardboard to improve the hardness and stiffness of the document seal itself, and ensured the moisture-proof and waterproof performance of the document seal by coating the waterproof lay...

Examples

Embodiment 1

[0025] A production process of a file envelope with better reinforcement performance, comprising:

[0026] Step 1) Preparation of core paper and inner paper: add 10wt% reed pulp to chemical wood pulp, add D-cyphenthrin water-based emulsifier to obtain suspension, and further prepare core paper after stirring and shearing. Add conventional type kaolin into chemical wood pulp, and further prepare lining paper after stirring and shearing.

[0027] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 40°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form one body.

[0028] Step 3) Pretreatment of the face paper, after the face paper is subjected to calendering treatment, offset printing is carried out, printing is carried out with oily ink, and irradiated with 254nm ultraviolet lamp for 30 minutes.

[0029] Step 4) the preparation of reinforceme...

Embodiment 2

[0033] A production process of a file envelope with better reinforcement performance, comprising:

[0034] Step 1) Preparation of core paper and inner paper: add 20wt% reed grass pulp and D-cyphenthrin aqueous emulsifier to chemical wood pulp to obtain a suspension, and further prepare core paper after stirring and shearing. Precipitated calcium carbonate is added to chemical wood pulp, and lining paper is further prepared after stirring and shearing.

[0035] A proper amount of diketene is added to the paper material of core paper and inner paper.

[0036] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 50°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form a whole.

[0037] Step 3) Pretreatment of the face paper, after calendering the face paper, then offset printing, printing with oily ink, and irradiating with a 254nm ultraviolet la...

Embodiment 3

[0042] A production process of a file envelope with better reinforcement performance, comprising:

[0043]Step 1) Preparation of core paper and inner paper: add 14wt% straw pulp to chemical wood pulp, add D-cyphenthrin water-based emulsifier to obtain suspension, and further prepare core paper after stirring and shearing. Add kaolin, gypsum, and talc to chemical wood pulp, and then prepare lining paper after stirring and shearing.

[0044] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 45°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form a whole.

[0045] Step 3) Pretreatment of the face paper, after the face paper is subjected to calendering treatment, offset printing is carried out, printing is carried out with oily ink, and irradiated with a 254nm ultraviolet lamp for 50 minutes.

[0046] Step 4) the preparation of reinforcing coa...

technical field

[0001] The invention relates to the technical field of packaging, in particular to a reinforced document envelope for letter packaging and delivery. Background technique

[0002] After encapsulating the letter or document, the envelope is delivered to the recipient by the post office or courier company to realize the information exchange between the sender and the recipient; It saves the cost or time cost of communication between the sender and the recipient, and the mailing of letters or documents in envelopes facilitates people's lives. At present, the envelopes selected by post offices or courier companies are made of paper materials, and general paper materials have poor reinforcement performance.

[0003] In the early stage, the inventor used multi-layer micro-corrugated cardboard to improve the hardness and stiffness of the document seal itself, and ensured the moisture-proof and waterproof performance of the document seal by coating the waterproof lay...

Examples

Embodiment 1

[0025] A production process of a file envelope with better reinforcement performance, comprising:

[0026] Step 1) Preparation of core paper and inner paper: add 10wt% reed pulp to chemical wood pulp, add D-cyphenthrin water-based emulsifier to obtain suspension, and further prepare core paper after stirring and shearing. Add conventional type kaolin into chemical wood pulp, and further prepare lining paper after stirring and shearing.

[0027] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 40°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form one body.

[0028] Step 3) Pretreatment of the face paper, after the face paper is subjected to calendering treatment, offset printing is carried out, printing is carried out with oily ink, and irradiated with 254nm ultraviolet lamp for 30 minutes.

[0029] Step 4) the preparation of reinforceme...

Embodiment 2

[0033] A production process of a file envelope with better reinforcement performance, comprising:

[0034] Step 1) Preparation of core paper and inner paper: add 20wt% reed grass pulp and D-cyphenthrin aqueous emulsifier to chemical wood pulp to obtain a suspension, and further prepare core paper after stirring and shearing. Precipitated calcium carbonate is added to chemical wood pulp, and lining paper is further prepared after stirring and shearing.

[0035] A proper amount of diketene is added to the paper material of core paper and inner paper.

[0036] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 50°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form a whole.

[0037] Step 3) Pretreatment of the face paper, after calendering the face paper, then offset printing, printing with oily ink, and irradiating with a 254nm ultraviolet la...

Embodiment 3

[0042] A production process of a file envelope with better reinforcement performance, comprising:

[0043]Step 1) Preparation of core paper and inner paper: add 14wt% straw pulp to chemical wood pulp, add D-cyphenthrin water-based emulsifier to obtain suspension, and further prepare core paper after stirring and shearing. Add kaolin, gypsum, and talc to chemical wood pulp, and then prepare lining paper after stirring and shearing.

[0044] Step 2) The core paper and the inner paper are laminated, the core paper is preheated to 45°C, the inner paper is preheated to the same temperature as the core paper, and the core paper and the inner paper are pressed against each other to form a whole.

[0045] Step 3) Pretreatment of the face paper, after the face paper is subjected to calendering treatment, offset printing is carried out, printing is carried out with oily ink, and irradiated with a 254nm ultraviolet lamp for 50 minutes.

[0046] Step 4) the preparation of reinforcing coa...